diff --git a/include/CImg.h b/include/CImg.h
deleted file mode 100644
index 152f0ac..0000000
--- a/include/CImg.h
+++ /dev/null
@@ -1,60168 +0,0 @@
-/*
- #
- #  File            : CImg.h
- #                    ( C++ header file )
- #
- #  Description     : The C++ Template Image Processing Toolkit.
- #                    This file is the main component of the CImg Library project.
- #                    ( http://cimg.eu )
- #
- #  Project manager : David Tschumperle.
- #                    ( http://tschumperle.users.greyc.fr/ )
- #
- #                    A complete list of contributors is available in file 'README.txt'
- #                    distributed within the CImg package.
- #
- #  Licenses        : This file is 'dual-licensed', you have to choose one
- #                    of the two licenses below to apply.
- #
- #                    CeCILL-C
- #                    The CeCILL-C license is close to the GNU LGPL.
- #                    ( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html )
- #
- #                or  CeCILL v2.0
- #                    The CeCILL license is compatible with the GNU GPL.
- #                    ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
- #
- #  This software is governed either by the CeCILL or the CeCILL-C license
- #  under French law and abiding by the rules of distribution of free software.
- #  You can  use, modify and or redistribute the software under the terms of
- #  the CeCILL or CeCILL-C licenses as circulated by CEA, CNRS and INRIA
- #  at the following URL: "http://www.cecill.info".
- #
- #  As a counterpart to the access to the source code and  rights to copy,
- #  modify and redistribute granted by the license, users are provided only
- #  with a limited warranty  and the software's author,  the holder of the
- #  economic rights,  and the successive licensors  have only  limited
- #  liability.
- #
- #  In this respect, the user's attention is drawn to the risks associated
- #  with loading,  using,  modifying and/or developing or reproducing the
- #  software by the user in light of its specific status of free software,
- #  that may mean  that it is complicated to manipulate,  and  that  also
- #  therefore means  that it is reserved for developers  and  experienced
- #  professionals having in-depth computer knowledge. Users are therefore
- #  encouraged to load and test the software's suitability as regards their
- #  requirements in conditions enabling the security of their systems and/or
- #  data to be ensured and,  more generally, to use and operate it in the
- #  same conditions as regards security.
- #
- #  The fact that you are presently reading this means that you have had
- #  knowledge of the CeCILL and CeCILL-C licenses and that you accept its terms.
- #
-*/
-
-// Set version number of the library.
-#ifndef cimg_version
-#define cimg_version 200
-
-/*-----------------------------------------------------------
- #
- # Test and possibly auto-set CImg configuration variables
- # and include required headers.
- #
- # If you find that the default configuration variables are
- # not adapted to your system, you can override their values
- # before including the header file "CImg.h"
- # (use the #define directive).
- #
- ------------------------------------------------------------*/
-
-// Include standard C++ headers.
-// This is the minimal set of required headers to make CImg-based codes compile.
-#include <cstdio>
-#include <cstdlib>
-#include <cstdarg>
-#include <cstring>
-#include <cmath>
-#include <cfloat>
-#include <climits>
-#include <ctime>
-#include <exception>
-#include <algorithm>
-
-// Detect/configure OS variables.
-//
-// Define 'cimg_OS' to: '0' for an unknown OS (will try to minize library dependencies).
-//                      '1' for a Unix-like OS (Linux, Solaris, BSD, MacOSX, Irix, ...).
-//                      '2' for Microsoft Windows.
-//                      (auto-detection is performed if 'cimg_OS' is not set by the user).
-#ifndef cimg_OS
-#if defined(unix)        || defined(__unix)      || defined(__unix__) \
- || defined(linux)       || defined(__linux)     || defined(__linux__) \
- || defined(sun)         || defined(__sun) \
- || defined(BSD)         || defined(__OpenBSD__) || defined(__NetBSD__) \
- || defined(__FreeBSD__) || defined (__DragonFly__) \
- || defined(sgi)         || defined(__sgi) \
- || defined(__MACOSX__)  || defined(__APPLE__) \
- || defined(__CYGWIN__)
-#define cimg_OS 1
-#elif defined(_MSC_VER) || defined(WIN32)  || defined(_WIN32) || defined(__WIN32__) \
-   || defined(WIN64)    || defined(_WIN64) || defined(__WIN64__)
-#define cimg_OS 2
-#else
-#define cimg_OS 0
-#endif
-#elif !(cimg_OS==0 || cimg_OS==1 || cimg_OS==2)
-#error CImg Library: Invalid configuration variable 'cimg_OS'.
-#error (correct values are '0 = unknown OS', '1 = Unix-like OS', '2 = Microsoft Windows').
-#endif
-#ifndef cimg_date
-#define cimg_date __DATE__
-#endif
-#ifndef cimg_time
-#define cimg_time __TIME__
-#endif
-
-// Disable silly warnings on some Microsoft VC++ compilers.
-#ifdef _MSC_VER
-#pragma warning(push)
-#pragma warning(disable:4127)
-#pragma warning(disable:4244)
-#pragma warning(disable:4311)
-#pragma warning(disable:4312)
-#pragma warning(disable:4512)
-#pragma warning(disable:4571)
-#pragma warning(disable:4640)
-#pragma warning(disable:4706)
-#pragma warning(disable:4710)
-#pragma warning(disable:4800)
-#pragma warning(disable:4804)
-#pragma warning(disable:4820)
-#pragma warning(disable:4996)
-#define _CRT_SECURE_NO_DEPRECATE 1
-#define _CRT_SECURE_NO_WARNINGS 1
-#define _CRT_NONSTDC_NO_DEPRECATE 1
-#endif
-
-// Define correct string functions for each compiler and OS.
-#if cimg_OS==2 && defined(_MSC_VER)
-#define cimg_sscanf std::sscanf
-#define cimg_sprintf std::sprintf
-#define cimg_snprintf cimg::_snprintf
-#define cimg_vsnprintf cimg::_vsnprintf
-#else
-#include <stdio.h>
-#if defined(__MACOSX__) || defined(__APPLE__)
-#define cimg_sscanf cimg::_sscanf
-#define cimg_sprintf cimg::_sprintf
-#define cimg_snprintf cimg::_snprintf
-#define cimg_vsnprintf cimg::_vsnprintf
-#else
-#define cimg_sscanf std::sscanf
-#define cimg_sprintf std::sprintf
-#define cimg_snprintf snprintf
-#define cimg_vsnprintf vsnprintf
-#endif
-#endif
-
-// Include OS-specific headers.
-#if cimg_OS==1
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <fnmatch.h>
-#elif cimg_OS==2
-#ifndef std_fopen
-#define std_fopen cimg::win_fopen
-#endif
-#ifndef NOMINMAX
-#define NOMINMAX
-#endif
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#ifndef _WIN32_IE
-#define _WIN32_IE 0x0400
-#endif
-#include <shlobj.h>
-#include <process.h>
-#include <io.h>
-#endif
-
-// Look for C++11 features.
-#ifndef cimg_use_cpp11
-#if __cplusplus>201100
-#define cimg_use_cpp11 1
-#else
-#define cimg_use_cpp11 0
-#endif
-#endif
-#if cimg_use_cpp11==1
-#include <initializer_list>
-#include <utility>
-#endif
-
-// Convenient macro to define pragma
-#ifdef _MSC_VER
-#define cimg_pragma(x) __pragma(x)
-#else
-#define cimg_pragma(x) _Pragma(#x)
-#endif
-
-// Define own types 'cimg_long/ulong' and 'cimg_int64/uint64' to ensure portability.
-// ( constrained to 'sizeof(cimg_ulong/cimg_long) = sizeof(void*)' and 'sizeof(cimg_int64/cimg_uint64)=8' ).
-#if cimg_OS==2
-
-#define cimg_uint64 unsigned __int64
-#define cimg_int64 __int64
-#define cimg_ulong UINT_PTR
-#define cimg_long INT_PTR
-#ifdef _MSC_VER
-#define cimg_fuint64 "%I64u"
-#define cimg_fint64 "%I64d"
-#else
-#define cimg_fuint64 "%llu"
-#define cimg_fint64 "%lld"
-#endif
-
-#else
-
-#if UINTPTR_MAX==0xffffffff || defined(__arm__) || defined(_M_ARM)
-#define cimg_uint64 unsigned long long
-#define cimg_int64 long long
-#define cimg_fuint64 "%llu"
-#define cimg_fint64 "%lld"
-#else
-#define cimg_uint64 unsigned long
-#define cimg_int64 long
-#define cimg_fuint64 "%lu"
-#define cimg_fint64 "%ld"
-#endif
-
-#if defined(__arm__) || defined(_M_ARM)
-#define cimg_ulong unsigned long long
-#define cimg_long long long
-#else
-#define cimg_ulong unsigned long
-#define cimg_long long
-#endif
-
-#endif
-
-// Configure filename separator.
-//
-// Filename separator is set by default to '/', except for Windows where it is '\'.
-#ifndef cimg_file_separator
-#if cimg_OS==2
-#define cimg_file_separator '\\'
-#else
-#define cimg_file_separator '/'
-#endif
-#endif
-
-// Configure verbosity of output messages.
-//
-// Define 'cimg_verbosity' to: '0' to hide library messages (quiet mode).
-//                             '1' to output library messages on the console.
-//                             '2' to output library messages on a basic dialog window (default behavior).
-//                             '3' to do as '1' + add extra warnings (may slow down the code!).
-//                             '4' to do as '2' + add extra warnings (may slow down the code!).
-//
-// Define 'cimg_strict_warnings' to replace warning messages by exception throwns.
-//
-// Define 'cimg_use_vt100' to allow output of color messages on VT100-compatible terminals.
-#ifndef cimg_verbosity
-#if cimg_OS==2
-#define cimg_verbosity 2
-#else
-#define cimg_verbosity 1
-#endif
-#elif !(cimg_verbosity==0 || cimg_verbosity==1 || cimg_verbosity==2 || cimg_verbosity==3 || cimg_verbosity==4)
-#error CImg Library: Configuration variable 'cimg_verbosity' is badly defined.
-#error (should be { 0=quiet | 1=console | 2=dialog | 3=console+warnings | 4=dialog+warnings }).
-#endif
-
-// Configure display framework.
-//
-// Define 'cimg_display' to: '0' to disable display capabilities.
-//                           '1' to use the X-Window framework (X11).
-//                           '2' to use the Microsoft GDI32 framework.
-#ifndef cimg_display
-#if cimg_OS==0
-#define cimg_display 0
-#elif cimg_OS==1
-#define cimg_display 1
-#elif cimg_OS==2
-#define cimg_display 2
-#endif
-#elif !(cimg_display==0 || cimg_display==1 || cimg_display==2)
-#error CImg Library: Configuration variable 'cimg_display' is badly defined.
-#error (should be { 0=none | 1=X-Window (X11) | 2=Microsoft GDI32 }).
-#endif
-
-// Configure the 'abort' signal handler (does nothing by default).
-// A typical signal handler can be defined in your own source like this:
-// #define cimg_abort_test() if (is_abort) throw CImgAbortException("")
-//
-// where 'is_abort' is a boolean variable defined somewhere in your code and reachable in the method.
-// 'cimg_abort_test2()' does the same but is called more often (in inner loops).
-#if defined(cimg_abort_test) && defined(cimg_use_openmp)
-
-// Define abort macros to be used with OpenMP.
-#ifndef cimg_abort_init
-#define cimg_abort_init bool cimg_abort_go = true; cimg::unused(cimg_abort_go)
-#endif
-#ifndef cimg_abort_try
-#define cimg_abort_try if (cimg_abort_go) try
-#endif
-#ifndef cimg_abort_catch
-#define cimg_abort_catch() catch (CImgAbortException&) { cimg_pragma(omp atomic) cimg_abort_go&=false; }
-#endif
-#ifdef cimg_abort_test2
-#ifndef cimg_abort_try2
-#define cimg_abort_try2 cimg_abort_try
-#endif
-#ifndef cimg_abort_catch2
-#define cimg_abort_catch2() cimg_abort_catch()
-#endif
-#ifndef cimg_abort_catch_fill
-#define cimg_abort_catch_fill() \
-  catch (CImgException& e) { cimg_pragma(omp critical) CImg<charT>::string(e._message).move_to(is_error); \
-                             cimg_pragma(omp atomic) cimg_abort_go&=false; }
-#endif
-#endif
-
-#endif
-
-#ifndef cimg_abort_test
-#define cimg_abort_test()
-#endif
-#ifndef cimg_abort_test2
-#define cimg_abort_test2()
-#endif
-#ifndef cimg_abort_init
-#define cimg_abort_init
-#endif
-#ifndef cimg_abort_try
-#define cimg_abort_try
-#endif
-#ifndef cimg_abort_catch
-#define cimg_abort_catch()
-#endif
-#ifndef cimg_abort_try2
-#define cimg_abort_try2
-#endif
-#ifndef cimg_abort_catch2
-#define cimg_abort_catch2()
-#endif
-#ifndef cimg_abort_catch_fill
-#define cimg_abort_catch_fill()
-#endif
-#ifndef std_fopen
-#define std_fopen std::fopen
-#endif
-
-// Include display-specific headers.
-#if cimg_display==1
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-#include <X11/keysym.h>
-#include <pthread.h>
-#ifdef cimg_use_xshm
-#include <sys/ipc.h>
-#include <sys/shm.h>
-#include <X11/extensions/XShm.h>
-#endif
-#ifdef cimg_use_xrandr
-#include <X11/extensions/Xrandr.h>
-#endif
-#endif
-#ifndef cimg_appname
-#define cimg_appname "CImg"
-#endif
-
-// Configure OpenMP support.
-// (http://www.openmp.org)
-//
-// Define 'cimg_use_openmp' to enable OpenMP support.
-//
-// OpenMP directives may be used in a (very) few CImg functions to get
-// advantages of multi-core CPUs.
-#ifdef cimg_use_openmp
-#include <omp.h>
-#define cimg_pragma_openmp(p) cimg_pragma(omp p)
-#else
-#define cimg_pragma_openmp(p)
-#endif
-
-// Configure OpenCV support.
-// (http://opencv.willowgarage.com/wiki/)
-//
-// Define 'cimg_use_opencv' to enable OpenCV support.
-//
-// OpenCV library may be used to access images from cameras
-// (see method 'CImg<T>::load_camera()').
-#ifdef cimg_use_opencv
-#ifdef True
-#undef True
-#define _cimg_redefine_True
-#endif
-#ifdef False
-#undef False
-#define _cimg_redefine_False
-#endif
-#include <cstddef>
-#include "cv.h"
-#include "highgui.h"
-#endif
-
-// Configure LibPNG support.
-// (http://www.libpng.org)
-//
-// Define 'cimg_use_png' to enable LibPNG support.
-//
-// PNG library may be used to get a native support of '.png' files.
-// (see methods 'CImg<T>::{load,save}_png()'.
-#ifdef cimg_use_png
-extern "C" {
-#include "png.h"
-}
-#endif
-
-// Configure LibJPEG support.
-// (http://en.wikipedia.org/wiki/Libjpeg)
-//
-// Define 'cimg_use_jpeg' to enable LibJPEG support.
-//
-// JPEG library may be used to get a native support of '.jpg' files.
-// (see methods 'CImg<T>::{load,save}_jpeg()').
-#ifdef cimg_use_jpeg
-extern "C" {
-#include "jpeglib.h"
-#include "setjmp.h"
-}
-#endif
-
-// Configure LibTIFF support.
-// (http://www.libtiff.org)
-//
-// Define 'cimg_use_tiff' to enable LibTIFF support.
-//
-// TIFF library may be used to get a native support of '.tif' files.
-// (see methods 'CImg[List]<T>::{load,save}_tiff()').
-#ifdef cimg_use_tiff
-extern "C" {
-#define uint64 uint64_hack_
-#define int64 int64_hack_
-#include "tiffio.h"
-#undef uint64
-#undef int64
-}
-#endif
-
-// Configure LibMINC2 support.
-// (http://en.wikibooks.org/wiki/MINC/Reference/MINC2.0_File_Format_Reference)
-//
-// Define 'cimg_use_minc2' to enable LibMINC2 support.
-//
-// MINC2 library may be used to get a native support of '.mnc' files.
-// (see methods 'CImg<T>::{load,save}_minc2()').
-#ifdef cimg_use_minc2
-#include "minc_io_simple_volume.h"
-#include "minc_1_simple.h"
-#include "minc_1_simple_rw.h"
-#endif
-
-// Configure Zlib support.
-// (http://www.zlib.net)
-//
-// Define 'cimg_use_zlib' to enable Zlib support.
-//
-// Zlib library may be used to allow compressed data in '.cimgz' files
-// (see methods 'CImg[List]<T>::{load,save}_cimg()').
-#ifdef cimg_use_zlib
-extern "C" {
-#include "zlib.h"
-}
-#endif
-
-// Configure libcurl support.
-// (http://curl.haxx.se/libcurl/)
-//
-// Define 'cimg_use_curl' to enable libcurl support.
-//
-// Libcurl may be used to get a native support of file downloading from the network.
-// (see method 'cimg::load_network()'.)
-#ifdef cimg_use_curl
-#include "curl/curl.h"
-#endif
-
-// Configure Magick++ support.
-// (http://www.imagemagick.org/Magick++)
-//
-// Define 'cimg_use_magick' to enable Magick++ support.
-//
-// Magick++ library may be used to get a native support of various image file formats.
-// (see methods 'CImg<T>::{load,save}()').
-#ifdef cimg_use_magick
-#include "Magick++.h"
-#endif
-
-// Configure FFTW3 support.
-// (http://www.fftw.org)
-//
-// Define 'cimg_use_fftw3' to enable libFFTW3 support.
-//
-// FFTW3 library may be used to efficiently compute the Fast Fourier Transform
-// of image data, without restriction on the image size.
-// (see method 'CImg[List]<T>::FFT()').
-#ifdef cimg_use_fftw3
-extern "C" {
-#include "fftw3.h"
-}
-#endif
-
-// Configure LibBoard support.
-// (http://libboard.sourceforge.net/)
-//
-// Define 'cimg_use_board' to enable Board support.
-//
-// Board library may be used to draw 3d objects in vector-graphics canvas
-// that can be saved as '.ps' or '.svg' files afterwards.
-// (see method 'CImg<T>::draw_object3d()').
-#ifdef cimg_use_board
-#ifdef None
-#undef None
-#define _cimg_redefine_None
-#endif
-#include "Board.h"
-#endif
-
-// Configure OpenEXR support.
-// (http://www.openexr.com/)
-//
-// Define 'cimg_use_openexr' to enable OpenEXR support.
-//
-// OpenEXR library may be used to get a native support of '.exr' files.
-// (see methods 'CImg<T>::{load,save}_exr()').
-#ifdef cimg_use_openexr
-#include "ImfRgbaFile.h"
-#include "ImfInputFile.h"
-#include "ImfChannelList.h"
-#include "ImfMatrixAttribute.h"
-#include "ImfArray.h"
-#endif
-
-// Configure TinyEXR support.
-// (https://github.com/syoyo/tinyexr)
-//
-// Define 'cimg_use_tinyexr' to enable TinyEXR support.
-//
-// TinyEXR is a small, single header-only library to load and save OpenEXR(.exr) images.
-#ifdef cimg_use_tinyexr
-#ifndef TINYEXR_IMPLEMENTATION
-#define TINYEXR_IMPLEMENTATION
-#endif
-#include "tinyexr.h"
-#endif
-
-// Lapack configuration.
-// (http://www.netlib.org/lapack)
-//
-// Define 'cimg_use_lapack' to enable LAPACK support.
-//
-// Lapack library may be used in several CImg methods to speed up
-// matrix computations (eigenvalues, inverse, ...).
-#ifdef cimg_use_lapack
-extern "C" {
-  extern void sgetrf_(int*, int*, float*, int*, int*, int*);
-  extern void sgetri_(int*, float*, int*, int*, float*, int*, int*);
-  extern void sgetrs_(char*, int*, int*, float*, int*, int*, float*, int*, int*);
-  extern void sgesvd_(char*, char*, int*, int*, float*, int*, float*, float*, int*, float*, int*, float*, int*, int*);
-  extern void ssyev_(char*, char*, int*, float*, int*, float*, float*, int*, int*);
-  extern void dgetrf_(int*, int*, double*, int*, int*, int*);
-  extern void dgetri_(int*, double*, int*, int*, double*, int*, int*);
-  extern void dgetrs_(char*, int*, int*, double*, int*, int*, double*, int*, int*);
-  extern void dgesvd_(char*, char*, int*, int*, double*, int*, double*, double*,
-                      int*, double*, int*, double*, int*, int*);
-  extern void dsyev_(char*, char*, int*, double*, int*, double*, double*, int*, int*);
-  extern void dgels_(char*, int*,int*,int*,double*,int*,double*,int*,double*,int*,int*);
-  extern void sgels_(char*, int*,int*,int*,float*,int*,float*,int*,float*,int*,int*);
-}
-#endif
-
-// Check if min/max/PI macros are defined.
-//
-// CImg does not compile if macros 'min', 'max' or 'PI' are defined,
-// because it redefines functions min(), max() and const variable PI in the cimg:: namespace.
-// so it '#undef' these macros if necessary, and restore them to reasonable
-// values at the end of this file.
-#ifdef min
-#undef min
-#define _cimg_redefine_min
-#endif
-#ifdef max
-#undef max
-#define _cimg_redefine_max
-#endif
-#ifdef PI
-#undef PI
-#define _cimg_redefine_PI
-#endif
-
-// Define 'cimg_library' namespace suffix.
-//
-// You may want to add a suffix to the 'cimg_library' namespace, for instance if you need to work
-// with several versions of the library at the same time.
-#ifdef cimg_namespace_suffix
-#define __cimg_library_suffixed(s) cimg_library_##s
-#define _cimg_library_suffixed(s) __cimg_library_suffixed(s)
-#define cimg_library_suffixed _cimg_library_suffixed(cimg_namespace_suffix)
-#else
-#define cimg_library_suffixed cimg_library
-#endif
-
-/*------------------------------------------------------------------------------
-  #
-  # Define user-friendly macros.
-  #
-  # These CImg macros are prefixed by 'cimg_' and can be used safely in your own
-  # code. They are useful to parse command line options, or to write image loops.
-  #
-  ------------------------------------------------------------------------------*/
-
-// Macros to define program usage, and retrieve command line arguments.
-#define cimg_usage(usage) cimg_library_suffixed::cimg::option((char*)0,argc,argv,(char*)0,usage,false)
-#define cimg_help(str) cimg_library_suffixed::cimg::option((char*)0,argc,argv,str,(char*)0)
-#define cimg_option(name,defaut,usage) cimg_library_suffixed::cimg::option(name,argc,argv,defaut,usage)
-
-// Macros to define and manipulate local neighborhoods.
-#define CImg_2x2(I,T) T I[4]; \
-                      T& I##cc = I[0]; T& I##nc = I[1]; \
-                      T& I##cn = I[2]; T& I##nn = I[3]; \
-                      I##cc = I##nc = \
-                      I##cn = I##nn = 0
-
-#define CImg_3x3(I,T) T I[9]; \
-                      T& I##pp = I[0]; T& I##cp = I[1]; T& I##np = I[2]; \
-                      T& I##pc = I[3]; T& I##cc = I[4]; T& I##nc = I[5]; \
-                      T& I##pn = I[6]; T& I##cn = I[7]; T& I##nn = I[8]; \
-                      I##pp = I##cp = I##np = \
-                      I##pc = I##cc = I##nc = \
-                      I##pn = I##cn = I##nn = 0
-
-#define CImg_4x4(I,T) T I[16]; \
-                      T& I##pp = I[0]; T& I##cp = I[1]; T& I##np = I[2]; T& I##ap = I[3]; \
-                      T& I##pc = I[4]; T& I##cc = I[5]; T& I##nc = I[6]; T& I##ac = I[7]; \
-                      T& I##pn = I[8]; T& I##cn = I[9]; T& I##nn = I[10]; T& I##an = I[11]; \
-                      T& I##pa = I[12]; T& I##ca = I[13]; T& I##na = I[14]; T& I##aa = I[15]; \
-                      I##pp = I##cp = I##np = I##ap = \
-                      I##pc = I##cc = I##nc = I##ac = \
-                      I##pn = I##cn = I##nn = I##an = \
-                      I##pa = I##ca = I##na = I##aa = 0
-
-#define CImg_5x5(I,T) T I[25]; \
-                      T& I##bb = I[0]; T& I##pb = I[1]; T& I##cb = I[2]; T& I##nb = I[3]; T& I##ab = I[4]; \
-                      T& I##bp = I[5]; T& I##pp = I[6]; T& I##cp = I[7]; T& I##np = I[8]; T& I##ap = I[9]; \
-                      T& I##bc = I[10]; T& I##pc = I[11]; T& I##cc = I[12]; T& I##nc = I[13]; T& I##ac = I[14]; \
-                      T& I##bn = I[15]; T& I##pn = I[16]; T& I##cn = I[17]; T& I##nn = I[18]; T& I##an = I[19]; \
-                      T& I##ba = I[20]; T& I##pa = I[21]; T& I##ca = I[22]; T& I##na = I[23]; T& I##aa = I[24]; \
-                      I##bb = I##pb = I##cb = I##nb = I##ab = \
-                      I##bp = I##pp = I##cp = I##np = I##ap = \
-                      I##bc = I##pc = I##cc = I##nc = I##ac = \
-                      I##bn = I##pn = I##cn = I##nn = I##an = \
-                      I##ba = I##pa = I##ca = I##na = I##aa = 0
-
-#define CImg_2x2x2(I,T) T I[8]; \
-                      T& I##ccc = I[0]; T& I##ncc = I[1]; \
-                      T& I##cnc = I[2]; T& I##nnc = I[3]; \
-                      T& I##ccn = I[4]; T& I##ncn = I[5]; \
-                      T& I##cnn = I[6]; T& I##nnn = I[7]; \
-                      I##ccc = I##ncc = \
-                      I##cnc = I##nnc = \
-                      I##ccn = I##ncn = \
-                      I##cnn = I##nnn = 0
-
-#define CImg_3x3x3(I,T) T I[27]; \
-                      T& I##ppp = I[0]; T& I##cpp = I[1]; T& I##npp = I[2]; \
-                      T& I##pcp = I[3]; T& I##ccp = I[4]; T& I##ncp = I[5]; \
-                      T& I##pnp = I[6]; T& I##cnp = I[7]; T& I##nnp = I[8]; \
-                      T& I##ppc = I[9]; T& I##cpc = I[10]; T& I##npc = I[11]; \
-                      T& I##pcc = I[12]; T& I##ccc = I[13]; T& I##ncc = I[14]; \
-                      T& I##pnc = I[15]; T& I##cnc = I[16]; T& I##nnc = I[17]; \
-                      T& I##ppn = I[18]; T& I##cpn = I[19]; T& I##npn = I[20]; \
-                      T& I##pcn = I[21]; T& I##ccn = I[22]; T& I##ncn = I[23]; \
-                      T& I##pnn = I[24]; T& I##cnn = I[25]; T& I##nnn = I[26]; \
-                      I##ppp = I##cpp = I##npp = \
-                      I##pcp = I##ccp = I##ncp = \
-                      I##pnp = I##cnp = I##nnp = \
-                      I##ppc = I##cpc = I##npc = \
-                      I##pcc = I##ccc = I##ncc = \
-                      I##pnc = I##cnc = I##nnc = \
-                      I##ppn = I##cpn = I##npn = \
-                      I##pcn = I##ccn = I##ncn = \
-                      I##pnn = I##cnn = I##nnn = 0
-
-#define cimg_get2x2(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(x,y,z,c), I[1] = (T)(img)(_n1##x,y,z,c), I[2] = (T)(img)(x,_n1##y,z,c), \
-  I[3] = (T)(img)(_n1##x,_n1##y,z,c)
-
-#define cimg_get3x3(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p1##x,_p1##y,z,c), I[1] = (T)(img)(x,_p1##y,z,c), I[2] = (T)(img)(_n1##x,_p1##y,z,c), \
-  I[3] = (T)(img)(_p1##x,y,z,c), I[4] = (T)(img)(x,y,z,c), I[5] = (T)(img)(_n1##x,y,z,c), \
-  I[6] = (T)(img)(_p1##x,_n1##y,z,c), I[7] = (T)(img)(x,_n1##y,z,c), I[8] = (T)(img)(_n1##x,_n1##y,z,c)
-
-#define cimg_get4x4(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p1##x,_p1##y,z,c), I[1] = (T)(img)(x,_p1##y,z,c), I[2] = (T)(img)(_n1##x,_p1##y,z,c), \
-  I[3] = (T)(img)(_n2##x,_p1##y,z,c), I[4] = (T)(img)(_p1##x,y,z,c), I[5] = (T)(img)(x,y,z,c), \
-  I[6] = (T)(img)(_n1##x,y,z,c), I[7] = (T)(img)(_n2##x,y,z,c), I[8] = (T)(img)(_p1##x,_n1##y,z,c), \
-  I[9] = (T)(img)(x,_n1##y,z,c), I[10] = (T)(img)(_n1##x,_n1##y,z,c), I[11] = (T)(img)(_n2##x,_n1##y,z,c), \
-  I[12] = (T)(img)(_p1##x,_n2##y,z,c), I[13] = (T)(img)(x,_n2##y,z,c), I[14] = (T)(img)(_n1##x,_n2##y,z,c), \
-  I[15] = (T)(img)(_n2##x,_n2##y,z,c)
-
-#define cimg_get5x5(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p2##x,_p2##y,z,c), I[1] = (T)(img)(_p1##x,_p2##y,z,c), I[2] = (T)(img)(x,_p2##y,z,c), \
-  I[3] = (T)(img)(_n1##x,_p2##y,z,c), I[4] = (T)(img)(_n2##x,_p2##y,z,c), I[5] = (T)(img)(_p2##x,_p1##y,z,c), \
-  I[6] = (T)(img)(_p1##x,_p1##y,z,c), I[7] = (T)(img)(x,_p1##y,z,c), I[8] = (T)(img)(_n1##x,_p1##y,z,c), \
-  I[9] = (T)(img)(_n2##x,_p1##y,z,c), I[10] = (T)(img)(_p2##x,y,z,c), I[11] = (T)(img)(_p1##x,y,z,c), \
-  I[12] = (T)(img)(x,y,z,c), I[13] = (T)(img)(_n1##x,y,z,c), I[14] = (T)(img)(_n2##x,y,z,c), \
-  I[15] = (T)(img)(_p2##x,_n1##y,z,c), I[16] = (T)(img)(_p1##x,_n1##y,z,c), I[17] = (T)(img)(x,_n1##y,z,c), \
-  I[18] = (T)(img)(_n1##x,_n1##y,z,c), I[19] = (T)(img)(_n2##x,_n1##y,z,c), I[20] = (T)(img)(_p2##x,_n2##y,z,c), \
-  I[21] = (T)(img)(_p1##x,_n2##y,z,c), I[22] = (T)(img)(x,_n2##y,z,c), I[23] = (T)(img)(_n1##x,_n2##y,z,c), \
-  I[24] = (T)(img)(_n2##x,_n2##y,z,c)
-
-#define cimg_get6x6(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p2##x,_p2##y,z,c), I[1] = (T)(img)(_p1##x,_p2##y,z,c), I[2] = (T)(img)(x,_p2##y,z,c), \
-  I[3] = (T)(img)(_n1##x,_p2##y,z,c), I[4] = (T)(img)(_n2##x,_p2##y,z,c), I[5] = (T)(img)(_n3##x,_p2##y,z,c), \
-  I[6] = (T)(img)(_p2##x,_p1##y,z,c), I[7] = (T)(img)(_p1##x,_p1##y,z,c), I[8] = (T)(img)(x,_p1##y,z,c), \
-  I[9] = (T)(img)(_n1##x,_p1##y,z,c), I[10] = (T)(img)(_n2##x,_p1##y,z,c), I[11] = (T)(img)(_n3##x,_p1##y,z,c), \
-  I[12] = (T)(img)(_p2##x,y,z,c), I[13] = (T)(img)(_p1##x,y,z,c), I[14] = (T)(img)(x,y,z,c), \
-  I[15] = (T)(img)(_n1##x,y,z,c), I[16] = (T)(img)(_n2##x,y,z,c), I[17] = (T)(img)(_n3##x,y,z,c), \
-  I[18] = (T)(img)(_p2##x,_n1##y,z,c), I[19] = (T)(img)(_p1##x,_n1##y,z,c), I[20] = (T)(img)(x,_n1##y,z,c), \
-  I[21] = (T)(img)(_n1##x,_n1##y,z,c), I[22] = (T)(img)(_n2##x,_n1##y,z,c), I[23] = (T)(img)(_n3##x,_n1##y,z,c), \
-  I[24] = (T)(img)(_p2##x,_n2##y,z,c), I[25] = (T)(img)(_p1##x,_n2##y,z,c), I[26] = (T)(img)(x,_n2##y,z,c), \
-  I[27] = (T)(img)(_n1##x,_n2##y,z,c), I[28] = (T)(img)(_n2##x,_n2##y,z,c), I[29] = (T)(img)(_n3##x,_n2##y,z,c), \
-  I[30] = (T)(img)(_p2##x,_n3##y,z,c), I[31] = (T)(img)(_p1##x,_n3##y,z,c), I[32] = (T)(img)(x,_n3##y,z,c), \
-  I[33] = (T)(img)(_n1##x,_n3##y,z,c), I[34] = (T)(img)(_n2##x,_n3##y,z,c), I[35] = (T)(img)(_n3##x,_n3##y,z,c)
-
-#define cimg_get7x7(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p3##x,_p3##y,z,c), I[1] = (T)(img)(_p2##x,_p3##y,z,c), I[2] = (T)(img)(_p1##x,_p3##y,z,c), \
-  I[3] = (T)(img)(x,_p3##y,z,c), I[4] = (T)(img)(_n1##x,_p3##y,z,c), I[5] = (T)(img)(_n2##x,_p3##y,z,c), \
-  I[6] = (T)(img)(_n3##x,_p3##y,z,c), I[7] = (T)(img)(_p3##x,_p2##y,z,c), I[8] = (T)(img)(_p2##x,_p2##y,z,c), \
-  I[9] = (T)(img)(_p1##x,_p2##y,z,c), I[10] = (T)(img)(x,_p2##y,z,c), I[11] = (T)(img)(_n1##x,_p2##y,z,c), \
-  I[12] = (T)(img)(_n2##x,_p2##y,z,c), I[13] = (T)(img)(_n3##x,_p2##y,z,c), I[14] = (T)(img)(_p3##x,_p1##y,z,c), \
-  I[15] = (T)(img)(_p2##x,_p1##y,z,c), I[16] = (T)(img)(_p1##x,_p1##y,z,c), I[17] = (T)(img)(x,_p1##y,z,c), \
-  I[18] = (T)(img)(_n1##x,_p1##y,z,c), I[19] = (T)(img)(_n2##x,_p1##y,z,c), I[20] = (T)(img)(_n3##x,_p1##y,z,c), \
-  I[21] = (T)(img)(_p3##x,y,z,c), I[22] = (T)(img)(_p2##x,y,z,c), I[23] = (T)(img)(_p1##x,y,z,c), \
-  I[24] = (T)(img)(x,y,z,c), I[25] = (T)(img)(_n1##x,y,z,c), I[26] = (T)(img)(_n2##x,y,z,c), \
-  I[27] = (T)(img)(_n3##x,y,z,c), I[28] = (T)(img)(_p3##x,_n1##y,z,c), I[29] = (T)(img)(_p2##x,_n1##y,z,c), \
-  I[30] = (T)(img)(_p1##x,_n1##y,z,c), I[31] = (T)(img)(x,_n1##y,z,c), I[32] = (T)(img)(_n1##x,_n1##y,z,c), \
-  I[33] = (T)(img)(_n2##x,_n1##y,z,c), I[34] = (T)(img)(_n3##x,_n1##y,z,c), I[35] = (T)(img)(_p3##x,_n2##y,z,c), \
-  I[36] = (T)(img)(_p2##x,_n2##y,z,c), I[37] = (T)(img)(_p1##x,_n2##y,z,c), I[38] = (T)(img)(x,_n2##y,z,c), \
-  I[39] = (T)(img)(_n1##x,_n2##y,z,c), I[40] = (T)(img)(_n2##x,_n2##y,z,c), I[41] = (T)(img)(_n3##x,_n2##y,z,c), \
-  I[42] = (T)(img)(_p3##x,_n3##y,z,c), I[43] = (T)(img)(_p2##x,_n3##y,z,c), I[44] = (T)(img)(_p1##x,_n3##y,z,c), \
-  I[45] = (T)(img)(x,_n3##y,z,c), I[46] = (T)(img)(_n1##x,_n3##y,z,c), I[47] = (T)(img)(_n2##x,_n3##y,z,c), \
-  I[48] = (T)(img)(_n3##x,_n3##y,z,c)
-
-#define cimg_get8x8(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p3##x,_p3##y,z,c), I[1] = (T)(img)(_p2##x,_p3##y,z,c), I[2] = (T)(img)(_p1##x,_p3##y,z,c), \
-  I[3] = (T)(img)(x,_p3##y,z,c), I[4] = (T)(img)(_n1##x,_p3##y,z,c), I[5] = (T)(img)(_n2##x,_p3##y,z,c), \
-  I[6] = (T)(img)(_n3##x,_p3##y,z,c), I[7] = (T)(img)(_n4##x,_p3##y,z,c), I[8] = (T)(img)(_p3##x,_p2##y,z,c), \
-  I[9] = (T)(img)(_p2##x,_p2##y,z,c), I[10] = (T)(img)(_p1##x,_p2##y,z,c), I[11] = (T)(img)(x,_p2##y,z,c), \
-  I[12] = (T)(img)(_n1##x,_p2##y,z,c), I[13] = (T)(img)(_n2##x,_p2##y,z,c), I[14] = (T)(img)(_n3##x,_p2##y,z,c), \
-  I[15] = (T)(img)(_n4##x,_p2##y,z,c), I[16] = (T)(img)(_p3##x,_p1##y,z,c), I[17] = (T)(img)(_p2##x,_p1##y,z,c), \
-  I[18] = (T)(img)(_p1##x,_p1##y,z,c), I[19] = (T)(img)(x,_p1##y,z,c), I[20] = (T)(img)(_n1##x,_p1##y,z,c), \
-  I[21] = (T)(img)(_n2##x,_p1##y,z,c), I[22] = (T)(img)(_n3##x,_p1##y,z,c), I[23] = (T)(img)(_n4##x,_p1##y,z,c), \
-  I[24] = (T)(img)(_p3##x,y,z,c), I[25] = (T)(img)(_p2##x,y,z,c), I[26] = (T)(img)(_p1##x,y,z,c), \
-  I[27] = (T)(img)(x,y,z,c), I[28] = (T)(img)(_n1##x,y,z,c), I[29] = (T)(img)(_n2##x,y,z,c), \
-  I[30] = (T)(img)(_n3##x,y,z,c), I[31] = (T)(img)(_n4##x,y,z,c), I[32] = (T)(img)(_p3##x,_n1##y,z,c), \
-  I[33] = (T)(img)(_p2##x,_n1##y,z,c), I[34] = (T)(img)(_p1##x,_n1##y,z,c), I[35] = (T)(img)(x,_n1##y,z,c), \
-  I[36] = (T)(img)(_n1##x,_n1##y,z,c), I[37] = (T)(img)(_n2##x,_n1##y,z,c), I[38] = (T)(img)(_n3##x,_n1##y,z,c), \
-  I[39] = (T)(img)(_n4##x,_n1##y,z,c), I[40] = (T)(img)(_p3##x,_n2##y,z,c), I[41] = (T)(img)(_p2##x,_n2##y,z,c), \
-  I[42] = (T)(img)(_p1##x,_n2##y,z,c), I[43] = (T)(img)(x,_n2##y,z,c), I[44] = (T)(img)(_n1##x,_n2##y,z,c), \
-  I[45] = (T)(img)(_n2##x,_n2##y,z,c), I[46] = (T)(img)(_n3##x,_n2##y,z,c), I[47] = (T)(img)(_n4##x,_n2##y,z,c), \
-  I[48] = (T)(img)(_p3##x,_n3##y,z,c), I[49] = (T)(img)(_p2##x,_n3##y,z,c), I[50] = (T)(img)(_p1##x,_n3##y,z,c), \
-  I[51] = (T)(img)(x,_n3##y,z,c), I[52] = (T)(img)(_n1##x,_n3##y,z,c), I[53] = (T)(img)(_n2##x,_n3##y,z,c), \
-  I[54] = (T)(img)(_n3##x,_n3##y,z,c), I[55] = (T)(img)(_n4##x,_n3##y,z,c), I[56] = (T)(img)(_p3##x,_n4##y,z,c), \
-  I[57] = (T)(img)(_p2##x,_n4##y,z,c), I[58] = (T)(img)(_p1##x,_n4##y,z,c), I[59] = (T)(img)(x,_n4##y,z,c), \
-  I[60] = (T)(img)(_n1##x,_n4##y,z,c), I[61] = (T)(img)(_n2##x,_n4##y,z,c), I[62] = (T)(img)(_n3##x,_n4##y,z,c), \
-  I[63] = (T)(img)(_n4##x,_n4##y,z,c);
-
-#define cimg_get9x9(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p4##x,_p4##y,z,c), I[1] = (T)(img)(_p3##x,_p4##y,z,c), I[2] = (T)(img)(_p2##x,_p4##y,z,c), \
-  I[3] = (T)(img)(_p1##x,_p4##y,z,c), I[4] = (T)(img)(x,_p4##y,z,c), I[5] = (T)(img)(_n1##x,_p4##y,z,c), \
-  I[6] = (T)(img)(_n2##x,_p4##y,z,c), I[7] = (T)(img)(_n3##x,_p4##y,z,c), I[8] = (T)(img)(_n4##x,_p4##y,z,c), \
-  I[9] = (T)(img)(_p4##x,_p3##y,z,c), I[10] = (T)(img)(_p3##x,_p3##y,z,c), I[11] = (T)(img)(_p2##x,_p3##y,z,c), \
-  I[12] = (T)(img)(_p1##x,_p3##y,z,c), I[13] = (T)(img)(x,_p3##y,z,c), I[14] = (T)(img)(_n1##x,_p3##y,z,c), \
-  I[15] = (T)(img)(_n2##x,_p3##y,z,c), I[16] = (T)(img)(_n3##x,_p3##y,z,c), I[17] = (T)(img)(_n4##x,_p3##y,z,c), \
-  I[18] = (T)(img)(_p4##x,_p2##y,z,c), I[19] = (T)(img)(_p3##x,_p2##y,z,c), I[20] = (T)(img)(_p2##x,_p2##y,z,c), \
-  I[21] = (T)(img)(_p1##x,_p2##y,z,c), I[22] = (T)(img)(x,_p2##y,z,c), I[23] = (T)(img)(_n1##x,_p2##y,z,c), \
-  I[24] = (T)(img)(_n2##x,_p2##y,z,c), I[25] = (T)(img)(_n3##x,_p2##y,z,c), I[26] = (T)(img)(_n4##x,_p2##y,z,c), \
-  I[27] = (T)(img)(_p4##x,_p1##y,z,c), I[28] = (T)(img)(_p3##x,_p1##y,z,c), I[29] = (T)(img)(_p2##x,_p1##y,z,c), \
-  I[30] = (T)(img)(_p1##x,_p1##y,z,c), I[31] = (T)(img)(x,_p1##y,z,c), I[32] = (T)(img)(_n1##x,_p1##y,z,c), \
-  I[33] = (T)(img)(_n2##x,_p1##y,z,c), I[34] = (T)(img)(_n3##x,_p1##y,z,c), I[35] = (T)(img)(_n4##x,_p1##y,z,c), \
-  I[36] = (T)(img)(_p4##x,y,z,c), I[37] = (T)(img)(_p3##x,y,z,c), I[38] = (T)(img)(_p2##x,y,z,c), \
-  I[39] = (T)(img)(_p1##x,y,z,c), I[40] = (T)(img)(x,y,z,c), I[41] = (T)(img)(_n1##x,y,z,c), \
-  I[42] = (T)(img)(_n2##x,y,z,c), I[43] = (T)(img)(_n3##x,y,z,c), I[44] = (T)(img)(_n4##x,y,z,c), \
-  I[45] = (T)(img)(_p4##x,_n1##y,z,c), I[46] = (T)(img)(_p3##x,_n1##y,z,c), I[47] = (T)(img)(_p2##x,_n1##y,z,c), \
-  I[48] = (T)(img)(_p1##x,_n1##y,z,c), I[49] = (T)(img)(x,_n1##y,z,c), I[50] = (T)(img)(_n1##x,_n1##y,z,c), \
-  I[51] = (T)(img)(_n2##x,_n1##y,z,c), I[52] = (T)(img)(_n3##x,_n1##y,z,c), I[53] = (T)(img)(_n4##x,_n1##y,z,c), \
-  I[54] = (T)(img)(_p4##x,_n2##y,z,c), I[55] = (T)(img)(_p3##x,_n2##y,z,c), I[56] = (T)(img)(_p2##x,_n2##y,z,c), \
-  I[57] = (T)(img)(_p1##x,_n2##y,z,c), I[58] = (T)(img)(x,_n2##y,z,c), I[59] = (T)(img)(_n1##x,_n2##y,z,c), \
-  I[60] = (T)(img)(_n2##x,_n2##y,z,c), I[61] = (T)(img)(_n3##x,_n2##y,z,c), I[62] = (T)(img)(_n4##x,_n2##y,z,c), \
-  I[63] = (T)(img)(_p4##x,_n3##y,z,c), I[64] = (T)(img)(_p3##x,_n3##y,z,c), I[65] = (T)(img)(_p2##x,_n3##y,z,c), \
-  I[66] = (T)(img)(_p1##x,_n3##y,z,c), I[67] = (T)(img)(x,_n3##y,z,c), I[68] = (T)(img)(_n1##x,_n3##y,z,c), \
-  I[69] = (T)(img)(_n2##x,_n3##y,z,c), I[70] = (T)(img)(_n3##x,_n3##y,z,c), I[71] = (T)(img)(_n4##x,_n3##y,z,c), \
-  I[72] = (T)(img)(_p4##x,_n4##y,z,c), I[73] = (T)(img)(_p3##x,_n4##y,z,c), I[74] = (T)(img)(_p2##x,_n4##y,z,c), \
-  I[75] = (T)(img)(_p1##x,_n4##y,z,c), I[76] = (T)(img)(x,_n4##y,z,c), I[77] = (T)(img)(_n1##x,_n4##y,z,c), \
-  I[78] = (T)(img)(_n2##x,_n4##y,z,c), I[79] = (T)(img)(_n3##x,_n4##y,z,c), I[80] = (T)(img)(_n4##x,_n4##y,z,c)
-
-#define cimg_get2x2x2(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(x,y,z,c), I[1] = (T)(img)(_n1##x,y,z,c), I[2] = (T)(img)(x,_n1##y,z,c), \
-  I[3] = (T)(img)(_n1##x,_n1##y,z,c), I[4] = (T)(img)(x,y,_n1##z,c), I[5] = (T)(img)(_n1##x,y,_n1##z,c), \
-  I[6] = (T)(img)(x,_n1##y,_n1##z,c), I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)
-
-#define cimg_get3x3x3(img,x,y,z,c,I,T) \
-  I[0] = (T)(img)(_p1##x,_p1##y,_p1##z,c), I[1] = (T)(img)(x,_p1##y,_p1##z,c), \
-  I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c), I[3] = (T)(img)(_p1##x,y,_p1##z,c), I[4] = (T)(img)(x,y,_p1##z,c), \
-  I[5] = (T)(img)(_n1##x,y,_p1##z,c), I[6] = (T)(img)(_p1##x,_n1##y,_p1##z,c), I[7] = (T)(img)(x,_n1##y,_p1##z,c), \
-  I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c), I[9] = (T)(img)(_p1##x,_p1##y,z,c), I[10] = (T)(img)(x,_p1##y,z,c), \
-  I[11] = (T)(img)(_n1##x,_p1##y,z,c), I[12] = (T)(img)(_p1##x,y,z,c), I[13] = (T)(img)(x,y,z,c), \
-  I[14] = (T)(img)(_n1##x,y,z,c), I[15] = (T)(img)(_p1##x,_n1##y,z,c), I[16] = (T)(img)(x,_n1##y,z,c), \
-  I[17] = (T)(img)(_n1##x,_n1##y,z,c), I[18] = (T)(img)(_p1##x,_p1##y,_n1##z,c), I[19] = (T)(img)(x,_p1##y,_n1##z,c), \
-  I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c), I[21] = (T)(img)(_p1##x,y,_n1##z,c), I[22] = (T)(img)(x,y,_n1##z,c), \
-  I[23] = (T)(img)(_n1##x,y,_n1##z,c), I[24] = (T)(img)(_p1##x,_n1##y,_n1##z,c), I[25] = (T)(img)(x,_n1##y,_n1##z,c), \
-  I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)
-
-// Macros to perform various image loops.
-//
-// These macros are simpler to use than loops with C++ iterators.
-#define cimg_for(img,ptrs,T_ptrs) \
-  for (T_ptrs *ptrs = (img)._data, *_max##ptrs = (img)._data + (img).size(); ptrs<_max##ptrs; ++ptrs)
-#define cimg_rof(img,ptrs,T_ptrs) for (T_ptrs *ptrs = (img)._data + (img).size() - 1; ptrs>=(img)._data; --ptrs)
-#define cimg_foroff(img,off) for (cimg_ulong off = 0, _max##off = (img).size(); off<_max##off; ++off)
-
-#define cimg_for1(bound,i) for (int i = 0; i<(int)(bound); ++i)
-#define cimg_forX(img,x) cimg_for1((img)._width,x)
-#define cimg_forY(img,y) cimg_for1((img)._height,y)
-#define cimg_forZ(img,z) cimg_for1((img)._depth,z)
-#define cimg_forC(img,c) cimg_for1((img)._spectrum,c)
-#define cimg_forXY(img,x,y) cimg_forY(img,y) cimg_forX(img,x)
-#define cimg_forXZ(img,x,z) cimg_forZ(img,z) cimg_forX(img,x)
-#define cimg_forYZ(img,y,z) cimg_forZ(img,z) cimg_forY(img,y)
-#define cimg_forXC(img,x,c) cimg_forC(img,c) cimg_forX(img,x)
-#define cimg_forYC(img,y,c) cimg_forC(img,c) cimg_forY(img,y)
-#define cimg_forZC(img,z,c) cimg_forC(img,c) cimg_forZ(img,z)
-#define cimg_forXYZ(img,x,y,z) cimg_forZ(img,z) cimg_forXY(img,x,y)
-#define cimg_forXYC(img,x,y,c) cimg_forC(img,c) cimg_forXY(img,x,y)
-#define cimg_forXZC(img,x,z,c) cimg_forC(img,c) cimg_forXZ(img,x,z)
-#define cimg_forYZC(img,y,z,c) cimg_forC(img,c) cimg_forYZ(img,y,z)
-#define cimg_forXYZC(img,x,y,z,c) cimg_forC(img,c) cimg_forXYZ(img,x,y,z)
-
-#define cimg_rof1(bound,i) for (int i = (int)(bound) - 1; i>=0; --i)
-#define cimg_rofX(img,x) cimg_rof1((img)._width,x)
-#define cimg_rofY(img,y) cimg_rof1((img)._height,y)
-#define cimg_rofZ(img,z) cimg_rof1((img)._depth,z)
-#define cimg_rofC(img,c) cimg_rof1((img)._spectrum,c)
-#define cimg_rofXY(img,x,y) cimg_rofY(img,y) cimg_rofX(img,x)
-#define cimg_rofXZ(img,x,z) cimg_rofZ(img,z) cimg_rofX(img,x)
-#define cimg_rofYZ(img,y,z) cimg_rofZ(img,z) cimg_rofY(img,y)
-#define cimg_rofXC(img,x,c) cimg_rofC(img,c) cimg_rofX(img,x)
-#define cimg_rofYC(img,y,c) cimg_rofC(img,c) cimg_rofY(img,y)
-#define cimg_rofZC(img,z,c) cimg_rofC(img,c) cimg_rofZ(img,z)
-#define cimg_rofXYZ(img,x,y,z) cimg_rofZ(img,z) cimg_rofXY(img,x,y)
-#define cimg_rofXYC(img,x,y,c) cimg_rofC(img,c) cimg_rofXY(img,x,y)
-#define cimg_rofXZC(img,x,z,c) cimg_rofC(img,c) cimg_rofXZ(img,x,z)
-#define cimg_rofYZC(img,y,z,c) cimg_rofC(img,c) cimg_rofYZ(img,y,z)
-#define cimg_rofXYZC(img,x,y,z,c) cimg_rofC(img,c) cimg_rofXYZ(img,x,y,z)
-
-#define cimg_for_in1(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), _max##i = (int)(i1)<(int)(bound)?(int)(i1):(int)(bound) - 1; i<=_max##i; ++i)
-#define cimg_for_inX(img,x0,x1,x) cimg_for_in1((img)._width,x0,x1,x)
-#define cimg_for_inY(img,y0,y1,y) cimg_for_in1((img)._height,y0,y1,y)
-#define cimg_for_inZ(img,z0,z1,z) cimg_for_in1((img)._depth,z0,z1,z)
-#define cimg_for_inC(img,c0,c1,c) cimg_for_in1((img)._spectrum,c0,c1,c)
-#define cimg_for_inXY(img,x0,y0,x1,y1,x,y) cimg_for_inY(img,y0,y1,y) cimg_for_inX(img,x0,x1,x)
-#define cimg_for_inXZ(img,x0,z0,x1,z1,x,z) cimg_for_inZ(img,z0,z1,z) cimg_for_inX(img,x0,x1,x)
-#define cimg_for_inXC(img,x0,c0,x1,c1,x,c) cimg_for_inC(img,c0,c1,c) cimg_for_inX(img,x0,x1,x)
-#define cimg_for_inYZ(img,y0,z0,y1,z1,y,z) cimg_for_inZ(img,x0,z1,z) cimg_for_inY(img,y0,y1,y)
-#define cimg_for_inYC(img,y0,c0,y1,c1,y,c) cimg_for_inC(img,c0,c1,c) cimg_for_inY(img,y0,y1,y)
-#define cimg_for_inZC(img,z0,c0,z1,c1,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inZ(img,z0,z1,z)
-#define cimg_for_inXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_inZ(img,z0,z1,z) cimg_for_inXY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_inXYC(img,x0,y0,c0,x1,y1,c1,x,y,c) cimg_for_inC(img,c0,c1,c) cimg_for_inXY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_inXZC(img,x0,z0,c0,x1,z1,c1,x,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inXZ(img,x0,z0,x1,z1,x,z)
-#define cimg_for_inYZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inYZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_inXYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_inC(img,c0,c1,c) cimg_for_inXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-#define cimg_for_insideX(img,x,n) cimg_for_inX(img,n,(img)._width - 1 - (n),x)
-#define cimg_for_insideY(img,y,n) cimg_for_inY(img,n,(img)._height - 1 - (n),y)
-#define cimg_for_insideZ(img,z,n) cimg_for_inZ(img,n,(img)._depth  - 1 - (n),z)
-#define cimg_for_insideC(img,c,n) cimg_for_inC(img,n,(img)._spectrum - 1 - (n),c)
-#define cimg_for_insideXY(img,x,y,n) cimg_for_inXY(img,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n),x,y)
-#define cimg_for_insideXYZ(img,x,y,z,n) \
-  cimg_for_inXYZ(img,n,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n),(img)._depth - 1 - (n),x,y,z)
-#define cimg_for_insideXYZC(img,x,y,z,c,n) \
-  cimg_for_inXYZ(img,n,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n),(img)._depth - 1 - (n),x,y,z)
-
-#define cimg_for_out1(boundi,i0,i1,i) \
- for (int i = (int)(i0)>0?0:(int)(i1) + 1; i<(int)(boundi); ++i, i = i==(int)(i0)?(int)(i1) + 1:i)
-#define cimg_for_out2(boundi,boundj,i0,j0,i1,j1,i,j) \
- for (int j = 0; j<(int)(boundj); ++j) \
- for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j?0:(int)(i0)>0?0:(int)(i1) + 1; i<(int)(boundi); \
-  ++i, i = _n1j?i:(i==(int)(i0)?(int)(i1) + 1:i))
-#define cimg_for_out3(boundi,boundj,boundk,i0,j0,k0,i1,j1,k1,i,j,k) \
- for (int k = 0; k<(int)(boundk); ++k) \
- for (int _n1k = (int)(k<(int)(k0) || k>(int)(k1)), j = 0; j<(int)(boundj); ++j) \
- for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j || _n1k?0:(int)(i0)>0?0:(int)(i1) + 1; i<(int)(boundi); \
-  ++i, i = _n1j || _n1k?i:(i==(int)(i0)?(int)(i1) + 1:i))
-#define cimg_for_out4(boundi,boundj,boundk,boundl,i0,j0,k0,l0,i1,j1,k1,l1,i,j,k,l) \
- for (int l = 0; l<(int)(boundl); ++l) \
- for (int _n1l = (int)(l<(int)(l0) || l>(int)(l1)), k = 0; k<(int)(boundk); ++k) \
- for (int _n1k = (int)(k<(int)(k0) || k>(int)(k1)), j = 0; j<(int)(boundj); ++j) \
- for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j || _n1k || _n1l?0:(int)(i0)>0?0:(int)(i1) + 1; \
-  i<(int)(boundi); ++i, i = _n1j || _n1k || _n1l?i:(i==(int)(i0)?(int)(i1) + 1:i))
-#define cimg_for_outX(img,x0,x1,x) cimg_for_out1((img)._width,x0,x1,x)
-#define cimg_for_outY(img,y0,y1,y) cimg_for_out1((img)._height,y0,y1,y)
-#define cimg_for_outZ(img,z0,z1,z) cimg_for_out1((img)._depth,z0,z1,z)
-#define cimg_for_outC(img,c0,c1,c) cimg_for_out1((img)._spectrum,c0,c1,c)
-#define cimg_for_outXY(img,x0,y0,x1,y1,x,y) cimg_for_out2((img)._width,(img)._height,x0,y0,x1,y1,x,y)
-#define cimg_for_outXZ(img,x0,z0,x1,z1,x,z) cimg_for_out2((img)._width,(img)._depth,x0,z0,x1,z1,x,z)
-#define cimg_for_outXC(img,x0,c0,x1,c1,x,c) cimg_for_out2((img)._width,(img)._spectrum,x0,c0,x1,c1,x,c)
-#define cimg_for_outYZ(img,y0,z0,y1,z1,y,z) cimg_for_out2((img)._height,(img)._depth,y0,z0,y1,z1,y,z)
-#define cimg_for_outYC(img,y0,c0,y1,c1,y,c) cimg_for_out2((img)._height,(img)._spectrum,y0,c0,y1,c1,y,c)
-#define cimg_for_outZC(img,z0,c0,z1,c1,z,c) cimg_for_out2((img)._depth,(img)._spectrum,z0,c0,z1,c1,z,c)
-#define cimg_for_outXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) \
-  cimg_for_out3((img)._width,(img)._height,(img)._depth,x0,y0,z0,x1,y1,z1,x,y,z)
-#define cimg_for_outXYC(img,x0,y0,c0,x1,y1,c1,x,y,c) \
-  cimg_for_out3((img)._width,(img)._height,(img)._spectrum,x0,y0,c0,x1,y1,c1,x,y,c)
-#define cimg_for_outXZC(img,x0,z0,c0,x1,z1,c1,x,z,c) \
-  cimg_for_out3((img)._width,(img)._depth,(img)._spectrum,x0,z0,c0,x1,z1,c1,x,z,c)
-#define cimg_for_outYZC(img,y0,z0,c0,y1,z1,c1,y,z,c) \
-  cimg_for_out3((img)._height,(img)._depth,(img)._spectrum,y0,z0,c0,y1,z1,c1,y,z,c)
-#define cimg_for_outXYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
- cimg_for_out4((img)._width,(img)._height,(img)._depth,(img)._spectrum,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c)
-#define cimg_for_borderX(img,x,n) cimg_for_outX(img,n,(img)._width - 1 - (n),x)
-#define cimg_for_borderY(img,y,n) cimg_for_outY(img,n,(img)._height - 1 - (n),y)
-#define cimg_for_borderZ(img,z,n) cimg_for_outZ(img,n,(img)._depth - 1 - (n),z)
-#define cimg_for_borderC(img,c,n) cimg_for_outC(img,n,(img)._spectrum - 1 - (n),c)
-#define cimg_for_borderXY(img,x,y,n) cimg_for_outXY(img,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n),x,y)
-#define cimg_for_borderXYZ(img,x,y,z,n) \
-  cimg_for_outXYZ(img,n,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n),(img)._depth - 1 - (n),x,y,z)
-#define cimg_for_borderXYZC(img,x,y,z,c,n) \
- cimg_for_outXYZC(img,n,n,n,n,(img)._width - 1 - (n),(img)._height - 1 - (n), \
-                  (img)._depth - 1 - (n),(img)._spectrum - 1 - (n),x,y,z,c)
-
-#define cimg_for_spiralXY(img,x,y) \
- for (int x = 0, y = 0, _n1##x = 1, _n1##y = (img).width()*(img).height(); _n1##y; \
-      --_n1##y, _n1##x+=(_n1##x>>2) - ((!(_n1##x&3)?--y:((_n1##x&3)==1?(img)._width - 1 - ++x:\
-      ((_n1##x&3)==2?(img)._height - 1 - ++y:--x))))?0:1)
-
-#define cimg_for_lineXY(x,y,x0,y0,x1,y1) \
- for (int x = (int)(x0), y = (int)(y0), _sx = 1, _sy = 1, _steep = 0, \
-      _dx=(x1)>(x0)?(int)(x1) - (int)(x0):(_sx=-1,(int)(x0) - (int)(x1)), \
-      _dy=(y1)>(y0)?(int)(y1) - (int)(y0):(_sy=-1,(int)(y0) - (int)(y1)), \
-      _counter = _dx, \
-      _err = _dx>_dy?(_dy>>1):((_steep=1),(_counter=_dy),(_dx>>1)); \
-      _counter>=0; \
-      --_counter, x+=_steep? \
-      (y+=_sy,(_err-=_dx)<0?_err+=_dy,_sx:0): \
-      (y+=(_err-=_dy)<0?_err+=_dx,_sy:0,_sx))
-
-#define cimg_for2(bound,i) \
- for (int i = 0, _n1##i = 1>=(bound)?(int)(bound) - 1:1; \
-      _n1##i<(int)(bound) || i==--_n1##i; \
-      ++i, ++_n1##i)
-#define cimg_for2X(img,x) cimg_for2((img)._width,x)
-#define cimg_for2Y(img,y) cimg_for2((img)._height,y)
-#define cimg_for2Z(img,z) cimg_for2((img)._depth,z)
-#define cimg_for2C(img,c) cimg_for2((img)._spectrum,c)
-#define cimg_for2XY(img,x,y) cimg_for2Y(img,y) cimg_for2X(img,x)
-#define cimg_for2XZ(img,x,z) cimg_for2Z(img,z) cimg_for2X(img,x)
-#define cimg_for2XC(img,x,c) cimg_for2C(img,c) cimg_for2X(img,x)
-#define cimg_for2YZ(img,y,z) cimg_for2Z(img,z) cimg_for2Y(img,y)
-#define cimg_for2YC(img,y,c) cimg_for2C(img,c) cimg_for2Y(img,y)
-#define cimg_for2ZC(img,z,c) cimg_for2C(img,c) cimg_for2Z(img,z)
-#define cimg_for2XYZ(img,x,y,z) cimg_for2Z(img,z) cimg_for2XY(img,x,y)
-#define cimg_for2XZC(img,x,z,c) cimg_for2C(img,c) cimg_for2XZ(img,x,z)
-#define cimg_for2YZC(img,y,z,c) cimg_for2C(img,c) cimg_for2YZ(img,y,z)
-#define cimg_for2XYZC(img,x,y,z,c) cimg_for2C(img,c) cimg_for2XYZ(img,x,y,z)
-
-#define cimg_for_in2(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1; \
-      i<=(int)(i1) && (_n1##i<(int)(bound) || i==--_n1##i); \
-      ++i, ++_n1##i)
-#define cimg_for_in2X(img,x0,x1,x) cimg_for_in2((img)._width,x0,x1,x)
-#define cimg_for_in2Y(img,y0,y1,y) cimg_for_in2((img)._height,y0,y1,y)
-#define cimg_for_in2Z(img,z0,z1,z) cimg_for_in2((img)._depth,z0,z1,z)
-#define cimg_for_in2C(img,c0,c1,c) cimg_for_in2((img)._spectrum,c0,c1,c)
-#define cimg_for_in2XY(img,x0,y0,x1,y1,x,y) cimg_for_in2Y(img,y0,y1,y) cimg_for_in2X(img,x0,x1,x)
-#define cimg_for_in2XZ(img,x0,z0,x1,z1,x,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2X(img,x0,x1,x)
-#define cimg_for_in2XC(img,x0,c0,x1,c1,x,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2X(img,x0,x1,x)
-#define cimg_for_in2YZ(img,y0,z0,y1,z1,y,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2Y(img,y0,y1,y)
-#define cimg_for_in2YC(img,y0,c0,y1,c1,y,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2Y(img,y0,y1,y)
-#define cimg_for_in2ZC(img,z0,c0,z1,c1,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2Z(img,z0,z1,z)
-#define cimg_for_in2XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in2XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in2YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in2XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in2C(img,c0,c1,c) cimg_for_in2XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for3(bound,i) \
- for (int i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1; \
-      _n1##i<(int)(bound) || i==--_n1##i; \
-      _p1##i = i++, ++_n1##i)
-#define cimg_for3X(img,x) cimg_for3((img)._width,x)
-#define cimg_for3Y(img,y) cimg_for3((img)._height,y)
-#define cimg_for3Z(img,z) cimg_for3((img)._depth,z)
-#define cimg_for3C(img,c) cimg_for3((img)._spectrum,c)
-#define cimg_for3XY(img,x,y) cimg_for3Y(img,y) cimg_for3X(img,x)
-#define cimg_for3XZ(img,x,z) cimg_for3Z(img,z) cimg_for3X(img,x)
-#define cimg_for3XC(img,x,c) cimg_for3C(img,c) cimg_for3X(img,x)
-#define cimg_for3YZ(img,y,z) cimg_for3Z(img,z) cimg_for3Y(img,y)
-#define cimg_for3YC(img,y,c) cimg_for3C(img,c) cimg_for3Y(img,y)
-#define cimg_for3ZC(img,z,c) cimg_for3C(img,c) cimg_for3Z(img,z)
-#define cimg_for3XYZ(img,x,y,z) cimg_for3Z(img,z) cimg_for3XY(img,x,y)
-#define cimg_for3XZC(img,x,z,c) cimg_for3C(img,c) cimg_for3XZ(img,x,z)
-#define cimg_for3YZC(img,y,z,c) cimg_for3C(img,c) cimg_for3YZ(img,y,z)
-#define cimg_for3XYZC(img,x,y,z,c) cimg_for3C(img,c) cimg_for3XYZ(img,x,y,z)
-
-#define cimg_for_in3(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1; \
-      i<=(int)(i1) && (_n1##i<(int)(bound) || i==--_n1##i); \
-      _p1##i = i++, ++_n1##i)
-#define cimg_for_in3X(img,x0,x1,x) cimg_for_in3((img)._width,x0,x1,x)
-#define cimg_for_in3Y(img,y0,y1,y) cimg_for_in3((img)._height,y0,y1,y)
-#define cimg_for_in3Z(img,z0,z1,z) cimg_for_in3((img)._depth,z0,z1,z)
-#define cimg_for_in3C(img,c0,c1,c) cimg_for_in3((img)._spectrum,c0,c1,c)
-#define cimg_for_in3XY(img,x0,y0,x1,y1,x,y) cimg_for_in3Y(img,y0,y1,y) cimg_for_in3X(img,x0,x1,x)
-#define cimg_for_in3XZ(img,x0,z0,x1,z1,x,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3X(img,x0,x1,x)
-#define cimg_for_in3XC(img,x0,c0,x1,c1,x,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3X(img,x0,x1,x)
-#define cimg_for_in3YZ(img,y0,z0,y1,z1,y,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3Y(img,y0,y1,y)
-#define cimg_for_in3YC(img,y0,c0,y1,c1,y,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3Y(img,y0,y1,y)
-#define cimg_for_in3ZC(img,z0,c0,z1,c1,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3Z(img,z0,z1,z)
-#define cimg_for_in3XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in3XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in3YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in3XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in3C(img,c0,c1,c) cimg_for_in3XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for4(bound,i) \
- for (int i = 0, _p1##i = 0, _n1##i = 1>=(bound)?(int)(bound) - 1:1, \
-      _n2##i = 2>=(bound)?(int)(bound) - 1:2; \
-      _n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i); \
-      _p1##i = i++, ++_n1##i, ++_n2##i)
-#define cimg_for4X(img,x) cimg_for4((img)._width,x)
-#define cimg_for4Y(img,y) cimg_for4((img)._height,y)
-#define cimg_for4Z(img,z) cimg_for4((img)._depth,z)
-#define cimg_for4C(img,c) cimg_for4((img)._spectrum,c)
-#define cimg_for4XY(img,x,y) cimg_for4Y(img,y) cimg_for4X(img,x)
-#define cimg_for4XZ(img,x,z) cimg_for4Z(img,z) cimg_for4X(img,x)
-#define cimg_for4XC(img,x,c) cimg_for4C(img,c) cimg_for4X(img,x)
-#define cimg_for4YZ(img,y,z) cimg_for4Z(img,z) cimg_for4Y(img,y)
-#define cimg_for4YC(img,y,c) cimg_for4C(img,c) cimg_for4Y(img,y)
-#define cimg_for4ZC(img,z,c) cimg_for4C(img,c) cimg_for4Z(img,z)
-#define cimg_for4XYZ(img,x,y,z) cimg_for4Z(img,z) cimg_for4XY(img,x,y)
-#define cimg_for4XZC(img,x,z,c) cimg_for4C(img,c) cimg_for4XZ(img,x,z)
-#define cimg_for4YZC(img,y,z,c) cimg_for4C(img,c) cimg_for4YZ(img,y,z)
-#define cimg_for4XYZC(img,x,y,z,c) cimg_for4C(img,c) cimg_for4XYZ(img,x,y,z)
-
-#define cimg_for_in4(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-      _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2; \
-      i<=(int)(i1) && (_n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i)); \
-      _p1##i = i++, ++_n1##i, ++_n2##i)
-#define cimg_for_in4X(img,x0,x1,x) cimg_for_in4((img)._width,x0,x1,x)
-#define cimg_for_in4Y(img,y0,y1,y) cimg_for_in4((img)._height,y0,y1,y)
-#define cimg_for_in4Z(img,z0,z1,z) cimg_for_in4((img)._depth,z0,z1,z)
-#define cimg_for_in4C(img,c0,c1,c) cimg_for_in4((img)._spectrum,c0,c1,c)
-#define cimg_for_in4XY(img,x0,y0,x1,y1,x,y) cimg_for_in4Y(img,y0,y1,y) cimg_for_in4X(img,x0,x1,x)
-#define cimg_for_in4XZ(img,x0,z0,x1,z1,x,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4X(img,x0,x1,x)
-#define cimg_for_in4XC(img,x0,c0,x1,c1,x,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4X(img,x0,x1,x)
-#define cimg_for_in4YZ(img,y0,z0,y1,z1,y,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4Y(img,y0,y1,y)
-#define cimg_for_in4YC(img,y0,c0,y1,c1,y,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4Y(img,y0,y1,y)
-#define cimg_for_in4ZC(img,z0,c0,z1,c1,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4Z(img,z0,z1,z)
-#define cimg_for_in4XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in4XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in4YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in4XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in4C(img,c0,c1,c) cimg_for_in4XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for5(bound,i) \
- for (int i = 0, _p2##i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1, \
-      _n2##i = 2>=(bound)?(int)(bound) - 1:2; \
-      _n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i); \
-      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i)
-#define cimg_for5X(img,x) cimg_for5((img)._width,x)
-#define cimg_for5Y(img,y) cimg_for5((img)._height,y)
-#define cimg_for5Z(img,z) cimg_for5((img)._depth,z)
-#define cimg_for5C(img,c) cimg_for5((img)._spectrum,c)
-#define cimg_for5XY(img,x,y) cimg_for5Y(img,y) cimg_for5X(img,x)
-#define cimg_for5XZ(img,x,z) cimg_for5Z(img,z) cimg_for5X(img,x)
-#define cimg_for5XC(img,x,c) cimg_for5C(img,c) cimg_for5X(img,x)
-#define cimg_for5YZ(img,y,z) cimg_for5Z(img,z) cimg_for5Y(img,y)
-#define cimg_for5YC(img,y,c) cimg_for5C(img,c) cimg_for5Y(img,y)
-#define cimg_for5ZC(img,z,c) cimg_for5C(img,c) cimg_for5Z(img,z)
-#define cimg_for5XYZ(img,x,y,z) cimg_for5Z(img,z) cimg_for5XY(img,x,y)
-#define cimg_for5XZC(img,x,z,c) cimg_for5C(img,c) cimg_for5XZ(img,x,z)
-#define cimg_for5YZC(img,y,z,c) cimg_for5C(img,c) cimg_for5YZ(img,y,z)
-#define cimg_for5XYZC(img,x,y,z,c) cimg_for5C(img,c) cimg_for5XYZ(img,x,y,z)
-
-#define cimg_for_in5(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p2##i = i - 2<0?0:i - 2, \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-      _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2; \
-      i<=(int)(i1) && (_n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i)); \
-      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i)
-#define cimg_for_in5X(img,x0,x1,x) cimg_for_in5((img)._width,x0,x1,x)
-#define cimg_for_in5Y(img,y0,y1,y) cimg_for_in5((img)._height,y0,y1,y)
-#define cimg_for_in5Z(img,z0,z1,z) cimg_for_in5((img)._depth,z0,z1,z)
-#define cimg_for_in5C(img,c0,c1,c) cimg_for_in5((img)._spectrum,c0,c1,c)
-#define cimg_for_in5XY(img,x0,y0,x1,y1,x,y) cimg_for_in5Y(img,y0,y1,y) cimg_for_in5X(img,x0,x1,x)
-#define cimg_for_in5XZ(img,x0,z0,x1,z1,x,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5X(img,x0,x1,x)
-#define cimg_for_in5XC(img,x0,c0,x1,c1,x,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5X(img,x0,x1,x)
-#define cimg_for_in5YZ(img,y0,z0,y1,z1,y,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5Y(img,y0,y1,y)
-#define cimg_for_in5YC(img,y0,c0,y1,c1,y,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5Y(img,y0,y1,y)
-#define cimg_for_in5ZC(img,z0,c0,z1,c1,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5Z(img,z0,z1,z)
-#define cimg_for_in5XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in5XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in5YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in5XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in5C(img,c0,c1,c) cimg_for_in5XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for6(bound,i) \
- for (int i = 0, _p2##i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1, \
-      _n2##i = 2>=(bound)?(int)(bound) - 1:2, \
-      _n3##i = 3>=(bound)?(int)(bound) - 1:3; \
-      _n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i); \
-      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
-#define cimg_for6X(img,x) cimg_for6((img)._width,x)
-#define cimg_for6Y(img,y) cimg_for6((img)._height,y)
-#define cimg_for6Z(img,z) cimg_for6((img)._depth,z)
-#define cimg_for6C(img,c) cimg_for6((img)._spectrum,c)
-#define cimg_for6XY(img,x,y) cimg_for6Y(img,y) cimg_for6X(img,x)
-#define cimg_for6XZ(img,x,z) cimg_for6Z(img,z) cimg_for6X(img,x)
-#define cimg_for6XC(img,x,c) cimg_for6C(img,c) cimg_for6X(img,x)
-#define cimg_for6YZ(img,y,z) cimg_for6Z(img,z) cimg_for6Y(img,y)
-#define cimg_for6YC(img,y,c) cimg_for6C(img,c) cimg_for6Y(img,y)
-#define cimg_for6ZC(img,z,c) cimg_for6C(img,c) cimg_for6Z(img,z)
-#define cimg_for6XYZ(img,x,y,z) cimg_for6Z(img,z) cimg_for6XY(img,x,y)
-#define cimg_for6XZC(img,x,z,c) cimg_for6C(img,c) cimg_for6XZ(img,x,z)
-#define cimg_for6YZC(img,y,z,c) cimg_for6C(img,c) cimg_for6YZ(img,y,z)
-#define cimg_for6XYZC(img,x,y,z,c) cimg_for6C(img,c) cimg_for6XYZ(img,x,y,z)
-
-#define cimg_for_in6(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p2##i = i - 2<0?0:i - 2, \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-      _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2, \
-      _n3##i = i + 3>=(int)(bound)?(int)(bound) - 1:i + 3; \
-      i<=(int)(i1) && \
-      (_n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i)); \
-      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
-#define cimg_for_in6X(img,x0,x1,x) cimg_for_in6((img)._width,x0,x1,x)
-#define cimg_for_in6Y(img,y0,y1,y) cimg_for_in6((img)._height,y0,y1,y)
-#define cimg_for_in6Z(img,z0,z1,z) cimg_for_in6((img)._depth,z0,z1,z)
-#define cimg_for_in6C(img,c0,c1,c) cimg_for_in6((img)._spectrum,c0,c1,c)
-#define cimg_for_in6XY(img,x0,y0,x1,y1,x,y) cimg_for_in6Y(img,y0,y1,y) cimg_for_in6X(img,x0,x1,x)
-#define cimg_for_in6XZ(img,x0,z0,x1,z1,x,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6X(img,x0,x1,x)
-#define cimg_for_in6XC(img,x0,c0,x1,c1,x,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6X(img,x0,x1,x)
-#define cimg_for_in6YZ(img,y0,z0,y1,z1,y,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6Y(img,y0,y1,y)
-#define cimg_for_in6YC(img,y0,c0,y1,c1,y,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6Y(img,y0,y1,y)
-#define cimg_for_in6ZC(img,z0,c0,z1,c1,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6Z(img,z0,z1,z)
-#define cimg_for_in6XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in6XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in6YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in6XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in6C(img,c0,c1,c) cimg_for_in6XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for7(bound,i) \
- for (int i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1, \
-      _n2##i = 2>=(bound)?(int)(bound) - 1:2, \
-      _n3##i = 3>=(bound)?(int)(bound) - 1:3; \
-      _n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i); \
-      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
-#define cimg_for7X(img,x) cimg_for7((img)._width,x)
-#define cimg_for7Y(img,y) cimg_for7((img)._height,y)
-#define cimg_for7Z(img,z) cimg_for7((img)._depth,z)
-#define cimg_for7C(img,c) cimg_for7((img)._spectrum,c)
-#define cimg_for7XY(img,x,y) cimg_for7Y(img,y) cimg_for7X(img,x)
-#define cimg_for7XZ(img,x,z) cimg_for7Z(img,z) cimg_for7X(img,x)
-#define cimg_for7XC(img,x,c) cimg_for7C(img,c) cimg_for7X(img,x)
-#define cimg_for7YZ(img,y,z) cimg_for7Z(img,z) cimg_for7Y(img,y)
-#define cimg_for7YC(img,y,c) cimg_for7C(img,c) cimg_for7Y(img,y)
-#define cimg_for7ZC(img,z,c) cimg_for7C(img,c) cimg_for7Z(img,z)
-#define cimg_for7XYZ(img,x,y,z) cimg_for7Z(img,z) cimg_for7XY(img,x,y)
-#define cimg_for7XZC(img,x,z,c) cimg_for7C(img,c) cimg_for7XZ(img,x,z)
-#define cimg_for7YZC(img,y,z,c) cimg_for7C(img,c) cimg_for7YZ(img,y,z)
-#define cimg_for7XYZC(img,x,y,z,c) cimg_for7C(img,c) cimg_for7XYZ(img,x,y,z)
-
-#define cimg_for_in7(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p3##i = i - 3<0?0:i - 3, \
-      _p2##i = i - 2<0?0:i - 2, \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-      _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2, \
-      _n3##i = i + 3>=(int)(bound)?(int)(bound) - 1:i + 3; \
-      i<=(int)(i1) && \
-      (_n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i)); \
-      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
-#define cimg_for_in7X(img,x0,x1,x) cimg_for_in7((img)._width,x0,x1,x)
-#define cimg_for_in7Y(img,y0,y1,y) cimg_for_in7((img)._height,y0,y1,y)
-#define cimg_for_in7Z(img,z0,z1,z) cimg_for_in7((img)._depth,z0,z1,z)
-#define cimg_for_in7C(img,c0,c1,c) cimg_for_in7((img)._spectrum,c0,c1,c)
-#define cimg_for_in7XY(img,x0,y0,x1,y1,x,y) cimg_for_in7Y(img,y0,y1,y) cimg_for_in7X(img,x0,x1,x)
-#define cimg_for_in7XZ(img,x0,z0,x1,z1,x,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7X(img,x0,x1,x)
-#define cimg_for_in7XC(img,x0,c0,x1,c1,x,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7X(img,x0,x1,x)
-#define cimg_for_in7YZ(img,y0,z0,y1,z1,y,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7Y(img,y0,y1,y)
-#define cimg_for_in7YC(img,y0,c0,y1,c1,y,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7Y(img,y0,y1,y)
-#define cimg_for_in7ZC(img,z0,c0,z1,c1,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7Z(img,z0,z1,z)
-#define cimg_for_in7XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in7XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in7YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in7XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in7C(img,c0,c1,c) cimg_for_in7XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for8(bound,i) \
- for (int i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1, \
-      _n2##i = 2>=(bound)?(int)(bound) - 1:2, \
-      _n3##i = 3>=(bound)?(int)(bound) - 1:3, \
-      _n4##i = 4>=(bound)?(int)(bound) - 1:4; \
-      _n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
-      i==(_n4##i = _n3##i = _n2##i = --_n1##i); \
-      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
-#define cimg_for8X(img,x) cimg_for8((img)._width,x)
-#define cimg_for8Y(img,y) cimg_for8((img)._height,y)
-#define cimg_for8Z(img,z) cimg_for8((img)._depth,z)
-#define cimg_for8C(img,c) cimg_for8((img)._spectrum,c)
-#define cimg_for8XY(img,x,y) cimg_for8Y(img,y) cimg_for8X(img,x)
-#define cimg_for8XZ(img,x,z) cimg_for8Z(img,z) cimg_for8X(img,x)
-#define cimg_for8XC(img,x,c) cimg_for8C(img,c) cimg_for8X(img,x)
-#define cimg_for8YZ(img,y,z) cimg_for8Z(img,z) cimg_for8Y(img,y)
-#define cimg_for8YC(img,y,c) cimg_for8C(img,c) cimg_for8Y(img,y)
-#define cimg_for8ZC(img,z,c) cimg_for8C(img,c) cimg_for8Z(img,z)
-#define cimg_for8XYZ(img,x,y,z) cimg_for8Z(img,z) cimg_for8XY(img,x,y)
-#define cimg_for8XZC(img,x,z,c) cimg_for8C(img,c) cimg_for8XZ(img,x,z)
-#define cimg_for8YZC(img,y,z,c) cimg_for8C(img,c) cimg_for8YZ(img,y,z)
-#define cimg_for8XYZC(img,x,y,z,c) cimg_for8C(img,c) cimg_for8XYZ(img,x,y,z)
-
-#define cimg_for_in8(bound,i0,i1,i) \
- for (int i = (int)(i0)<0?0:(int)(i0), \
-      _p3##i = i - 3<0?0:i - 3, \
-      _p2##i = i - 2<0?0:i - 2, \
-      _p1##i = i - 1<0?0:i - 1, \
-      _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-      _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2, \
-      _n3##i = i + 3>=(int)(bound)?(int)(bound) - 1:i + 3, \
-      _n4##i = i + 4>=(int)(bound)?(int)(bound) - 1:i + 4; \
-      i<=(int)(i1) && (_n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
-      i==(_n4##i = _n3##i = _n2##i = --_n1##i)); \
-      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
-#define cimg_for_in8X(img,x0,x1,x) cimg_for_in8((img)._width,x0,x1,x)
-#define cimg_for_in8Y(img,y0,y1,y) cimg_for_in8((img)._height,y0,y1,y)
-#define cimg_for_in8Z(img,z0,z1,z) cimg_for_in8((img)._depth,z0,z1,z)
-#define cimg_for_in8C(img,c0,c1,c) cimg_for_in8((img)._spectrum,c0,c1,c)
-#define cimg_for_in8XY(img,x0,y0,x1,y1,x,y) cimg_for_in8Y(img,y0,y1,y) cimg_for_in8X(img,x0,x1,x)
-#define cimg_for_in8XZ(img,x0,z0,x1,z1,x,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8X(img,x0,x1,x)
-#define cimg_for_in8XC(img,x0,c0,x1,c1,x,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8X(img,x0,x1,x)
-#define cimg_for_in8YZ(img,y0,z0,y1,z1,y,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8Y(img,y0,y1,y)
-#define cimg_for_in8YC(img,y0,c0,y1,c1,y,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8Y(img,y0,y1,y)
-#define cimg_for_in8ZC(img,z0,c0,z1,c1,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8Z(img,z0,z1,z)
-#define cimg_for_in8XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in8XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in8YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in8XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in8C(img,c0,c1,c) cimg_for_in8XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for9(bound,i) \
-  for (int i = 0, _p4##i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
-       _n1##i = 1>=(int)(bound)?(int)(bound) - 1:1, \
-       _n2##i = 2>=(int)(bound)?(int)(bound) - 1:2, \
-       _n3##i = 3>=(int)(bound)?(int)(bound) - 1:3, \
-       _n4##i = 4>=(int)(bound)?(int)(bound) - 1:4; \
-       _n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
-       i==(_n4##i = _n3##i = _n2##i = --_n1##i); \
-       _p4##i = _p3##i, _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
-#define cimg_for9X(img,x) cimg_for9((img)._width,x)
-#define cimg_for9Y(img,y) cimg_for9((img)._height,y)
-#define cimg_for9Z(img,z) cimg_for9((img)._depth,z)
-#define cimg_for9C(img,c) cimg_for9((img)._spectrum,c)
-#define cimg_for9XY(img,x,y) cimg_for9Y(img,y) cimg_for9X(img,x)
-#define cimg_for9XZ(img,x,z) cimg_for9Z(img,z) cimg_for9X(img,x)
-#define cimg_for9XC(img,x,c) cimg_for9C(img,c) cimg_for9X(img,x)
-#define cimg_for9YZ(img,y,z) cimg_for9Z(img,z) cimg_for9Y(img,y)
-#define cimg_for9YC(img,y,c) cimg_for9C(img,c) cimg_for9Y(img,y)
-#define cimg_for9ZC(img,z,c) cimg_for9C(img,c) cimg_for9Z(img,z)
-#define cimg_for9XYZ(img,x,y,z) cimg_for9Z(img,z) cimg_for9XY(img,x,y)
-#define cimg_for9XZC(img,x,z,c) cimg_for9C(img,c) cimg_for9XZ(img,x,z)
-#define cimg_for9YZC(img,y,z,c) cimg_for9C(img,c) cimg_for9YZ(img,y,z)
-#define cimg_for9XYZC(img,x,y,z,c) cimg_for9C(img,c) cimg_for9XYZ(img,x,y,z)
-
-#define cimg_for_in9(bound,i0,i1,i) \
-  for (int i = (int)(i0)<0?0:(int)(i0), \
-       _p4##i = i - 4<0?0:i - 4, \
-       _p3##i = i - 3<0?0:i - 3, \
-       _p2##i = i - 2<0?0:i - 2, \
-       _p1##i = i - 1<0?0:i - 1, \
-       _n1##i = i + 1>=(int)(bound)?(int)(bound) - 1:i + 1, \
-       _n2##i = i + 2>=(int)(bound)?(int)(bound) - 1:i + 2, \
-       _n3##i = i + 3>=(int)(bound)?(int)(bound) - 1:i + 3, \
-       _n4##i = i + 4>=(int)(bound)?(int)(bound) - 1:i + 4; \
-       i<=(int)(i1) && (_n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
-       i==(_n4##i = _n3##i = _n2##i = --_n1##i)); \
-       _p4##i = _p3##i, _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
-#define cimg_for_in9X(img,x0,x1,x) cimg_for_in9((img)._width,x0,x1,x)
-#define cimg_for_in9Y(img,y0,y1,y) cimg_for_in9((img)._height,y0,y1,y)
-#define cimg_for_in9Z(img,z0,z1,z) cimg_for_in9((img)._depth,z0,z1,z)
-#define cimg_for_in9C(img,c0,c1,c) cimg_for_in9((img)._spectrum,c0,c1,c)
-#define cimg_for_in9XY(img,x0,y0,x1,y1,x,y) cimg_for_in9Y(img,y0,y1,y) cimg_for_in9X(img,x0,x1,x)
-#define cimg_for_in9XZ(img,x0,z0,x1,z1,x,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9X(img,x0,x1,x)
-#define cimg_for_in9XC(img,x0,c0,x1,c1,x,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9X(img,x0,x1,x)
-#define cimg_for_in9YZ(img,y0,z0,y1,z1,y,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9Y(img,y0,y1,y)
-#define cimg_for_in9YC(img,y0,c0,y1,c1,y,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9Y(img,y0,y1,y)
-#define cimg_for_in9ZC(img,z0,c0,z1,c1,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9Z(img,z0,z1,z)
-#define cimg_for_in9XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9XY(img,x0,y0,x1,y1,x,y)
-#define cimg_for_in9XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9XZ(img,x0,y0,x1,y1,x,z)
-#define cimg_for_in9YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9YZ(img,y0,z0,y1,z1,y,z)
-#define cimg_for_in9XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
-  cimg_for_in9C(img,c0,c1,c) cimg_for_in9XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
-
-#define cimg_for2x2(img,x,y,z,c,I,T) \
-  cimg_for2((img)._height,y) for (int x = 0, \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(0,y,z,c)), \
-   (I[2] = (T)(img)(0,_n1##y,z,c)), \
-   1>=(img)._width?(img).width() - 1:1);  \
-   (_n1##x<(img).width() && ( \
-   (I[1] = (T)(img)(_n1##x,y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x; \
-   I[0] = I[1], \
-   I[2] = I[3], \
-   ++x, ++_n1##x)
-
-#define cimg_for_in2x2(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in2((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(x,y,z,c)), \
-   (I[2] = (T)(img)(x,_n1##y,z,c)), \
-   x + 1>=(int)(img)._width?(img).width() - 1:x + 1); \
-   x<=(int)(x1) && ((_n1##x<(img).width() && (  \
-   (I[1] = (T)(img)(_n1##x,y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x); \
-   I[0] = I[1], \
-   I[2] = I[3], \
-   ++x, ++_n1##x)
-
-#define cimg_for3x3(img,x,y,z,c,I,T) \
-  cimg_for3((img)._height,y) for (int x = 0, \
-   _p1##x = 0, \
-   _n1##x = (int)( \
-   (I[0] = I[1] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
-   (I[6] = I[7] = (T)(img)(0,_n1##y,z,c)), \
-   1>=(img)._width?(img).width() - 1:1); \
-   (_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x; \
-   I[0] = I[1], I[1] = I[2], \
-   I[3] = I[4], I[4] = I[5], \
-   I[6] = I[7], I[7] = I[8], \
-   _p1##x = x++, ++_n1##x)
-
-#define cimg_for_in3x3(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in3((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[3] = (T)(img)(_p1##x,y,z,c)), \
-   (I[6] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[1] = (T)(img)(x,_p1##y,z,c)), \
-   (I[4] = (T)(img)(x,y,z,c)), \
-   (I[7] = (T)(img)(x,_n1##y,z,c)), \
-   x + 1>=(int)(img)._width?(img).width() - 1:x + 1); \
-   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x);            \
-   I[0] = I[1], I[1] = I[2], \
-   I[3] = I[4], I[4] = I[5], \
-   I[6] = I[7], I[7] = I[8], \
-   _p1##x = x++, ++_n1##x)
-
-#define cimg_for4x4(img,x,y,z,c,I,T) \
-  cimg_for4((img)._height,y) for (int x = 0, \
-   _p1##x = 0, \
-   _n1##x = 1>=(img)._width?(img).width() - 1:1, \
-   _n2##x = (int)( \
-   (I[0] = I[1] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[4] = I[5] = (T)(img)(0,y,z,c)), \
-   (I[8] = I[9] = (T)(img)(0,_n1##y,z,c)), \
-   (I[12] = I[13] = (T)(img)(0,_n2##y,z,c)), \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[6] = (T)(img)(_n1##x,y,z,c)), \
-   (I[10] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   2>=(img)._width?(img).width() - 1:2); \
-   (_n2##x<(img).width() && ( \
-   (I[3] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[7] = (T)(img)(_n2##x,y,z,c)), \
-   (I[11] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[15] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
-   _n1##x==--_n2##x || x==(_n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], \
-   I[4] = I[5], I[5] = I[6], I[6] = I[7], \
-   I[8] = I[9], I[9] = I[10], I[10] = I[11], \
-   I[12] = I[13], I[13] = I[14], I[14] = I[15], \
-   _p1##x = x++, ++_n1##x, ++_n2##x)
-
-#define cimg_for_in4x4(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in4((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(int)(img)._width?(img).width() - 1:x + 1, \
-   _n2##x = (int)( \
-   (I[0] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[4] = (T)(img)(_p1##x,y,z,c)), \
-   (I[8] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[12] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[1] = (T)(img)(x,_p1##y,z,c)), \
-   (I[5] = (T)(img)(x,y,z,c)), \
-   (I[9] = (T)(img)(x,_n1##y,z,c)), \
-   (I[13] = (T)(img)(x,_n2##y,z,c)), \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[6] = (T)(img)(_n1##x,y,z,c)), \
-   (I[10] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   x + 2>=(int)(img)._width?(img).width() - 1:x + 2); \
-   x<=(int)(x1) && ((_n2##x<(img).width() && ( \
-   (I[3] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[7] = (T)(img)(_n2##x,y,z,c)), \
-   (I[11] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[15] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
-   _n1##x==--_n2##x || x==(_n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], \
-   I[4] = I[5], I[5] = I[6], I[6] = I[7], \
-   I[8] = I[9], I[9] = I[10], I[10] = I[11], \
-   I[12] = I[13], I[13] = I[14], I[14] = I[15], \
-   _p1##x = x++, ++_n1##x, ++_n2##x)
-
-#define cimg_for5x5(img,x,y,z,c,I,T) \
- cimg_for5((img)._height,y) for (int x = 0, \
-   _p2##x = 0, _p1##x = 0, \
-   _n1##x = 1>=(img)._width?(img).width() - 1:1, \
-   _n2##x = (int)( \
-   (I[0] = I[1] = I[2] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[5] = I[6] = I[7] = (T)(img)(0,_p1##y,z,c)), \
-   (I[10] = I[11] = I[12] = (T)(img)(0,y,z,c)), \
-   (I[15] = I[16] = I[17] = (T)(img)(0,_n1##y,z,c)), \
-   (I[20] = I[21] = I[22] = (T)(img)(0,_n2##y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[13] = (T)(img)(_n1##x,y,z,c)), \
-   (I[18] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[23] = (T)(img)(_n1##x,_n2##y,z,c)),  \
-   2>=(img)._width?(img).width() - 1:2); \
-   (_n2##x<(img).width() && ( \
-   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[9] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[14] = (T)(img)(_n2##x,y,z,c)), \
-   (I[19] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[24] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
-   _n1##x==--_n2##x || x==(_n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], \
-   I[5] = I[6], I[6] = I[7], I[7] = I[8], I[8] = I[9], \
-   I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], \
-   I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], \
-   I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
-   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x)
-
-#define cimg_for_in5x5(img,x0,y0,x1,y1,x,y,z,c,I,T) \
- cimg_for_in5((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p2##x = x - 2<0?0:x - 2, \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(int)(img)._width?(img).width() - 1:x + 1, \
-   _n2##x = (int)( \
-   (I[0] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[5] = (T)(img)(_p2##x,_p1##y,z,c)), \
-   (I[10] = (T)(img)(_p2##x,y,z,c)), \
-   (I[15] = (T)(img)(_p2##x,_n1##y,z,c)), \
-   (I[20] = (T)(img)(_p2##x,_n2##y,z,c)), \
-   (I[1] = (T)(img)(_p1##x,_p2##y,z,c)), \
-   (I[6] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[11] = (T)(img)(_p1##x,y,z,c)), \
-   (I[16] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[21] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[2] = (T)(img)(x,_p2##y,z,c)), \
-   (I[7] = (T)(img)(x,_p1##y,z,c)), \
-   (I[12] = (T)(img)(x,y,z,c)), \
-   (I[17] = (T)(img)(x,_n1##y,z,c)), \
-   (I[22] = (T)(img)(x,_n2##y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[13] = (T)(img)(_n1##x,y,z,c)), \
-   (I[18] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[23] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   x + 2>=(int)(img)._width?(img).width() - 1:x + 2); \
-   x<=(int)(x1) && ((_n2##x<(img).width() && ( \
-   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[9] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[14] = (T)(img)(_n2##x,y,z,c)), \
-   (I[19] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[24] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
-   _n1##x==--_n2##x || x==(_n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], \
-   I[5] = I[6], I[6] = I[7], I[7] = I[8], I[8] = I[9], \
-   I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], \
-   I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], \
-   I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
-   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x)
-
-#define cimg_for6x6(img,x,y,z,c,I,T) \
- cimg_for6((img)._height,y) for (int x = 0, \
-   _p2##x = 0, _p1##x = 0, \
-   _n1##x = 1>=(img)._width?(img).width() - 1:1, \
-   _n2##x = 2>=(img)._width?(img).width() - 1:2, \
-   _n3##x = (int)( \
-   (I[0] = I[1] = I[2] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[6] = I[7] = I[8] = (T)(img)(0,_p1##y,z,c)), \
-   (I[12] = I[13] = I[14] = (T)(img)(0,y,z,c)), \
-   (I[18] = I[19] = I[20] = (T)(img)(0,_n1##y,z,c)), \
-   (I[24] = I[25] = I[26] = (T)(img)(0,_n2##y,z,c)), \
-   (I[30] = I[31] = I[32] = (T)(img)(0,_n3##y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[9] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[15] = (T)(img)(_n1##x,y,z,c)), \
-   (I[21] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[27] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[33] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[10] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[16] = (T)(img)(_n2##x,y,z,c)), \
-   (I[22] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[28] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[34] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   3>=(img)._width?(img).width() - 1:3); \
-   (_n3##x<(img).width() && ( \
-   (I[5] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[11] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[17] = (T)(img)(_n3##x,y,z,c)), \
-   (I[23] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[29] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[35] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
-   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3## x = _n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], \
-   I[6] = I[7], I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], \
-   I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
-   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
-   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], \
-   I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
-   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)
-
-#define cimg_for_in6x6(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in6((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)x0, \
-   _p2##x = x - 2<0?0:x - 2, \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(int)(img)._width?(img).width() - 1:x + 1, \
-   _n2##x = x + 2>=(int)(img)._width?(img).width() - 1:x + 2, \
-   _n3##x = (int)( \
-   (I[0] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[6] = (T)(img)(_p2##x,_p1##y,z,c)), \
-   (I[12] = (T)(img)(_p2##x,y,z,c)), \
-   (I[18] = (T)(img)(_p2##x,_n1##y,z,c)), \
-   (I[24] = (T)(img)(_p2##x,_n2##y,z,c)), \
-   (I[30] = (T)(img)(_p2##x,_n3##y,z,c)), \
-   (I[1] = (T)(img)(_p1##x,_p2##y,z,c)), \
-   (I[7] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[13] = (T)(img)(_p1##x,y,z,c)), \
-   (I[19] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[25] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[31] = (T)(img)(_p1##x,_n3##y,z,c)), \
-   (I[2] = (T)(img)(x,_p2##y,z,c)), \
-   (I[8] = (T)(img)(x,_p1##y,z,c)), \
-   (I[14] = (T)(img)(x,y,z,c)), \
-   (I[20] = (T)(img)(x,_n1##y,z,c)), \
-   (I[26] = (T)(img)(x,_n2##y,z,c)), \
-   (I[32] = (T)(img)(x,_n3##y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[9] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[15] = (T)(img)(_n1##x,y,z,c)), \
-   (I[21] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[27] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[33] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[10] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[16] = (T)(img)(_n2##x,y,z,c)), \
-   (I[22] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[28] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[34] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   x + 3>=(int)(img)._width?(img).width() - 1:x + 3); \
-   x<=(int)(x1) && ((_n3##x<(img).width() && ( \
-   (I[5] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[11] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[17] = (T)(img)(_n3##x,y,z,c)), \
-   (I[23] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[29] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[35] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
-   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3## x = _n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], \
-   I[6] = I[7], I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], \
-   I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
-   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
-   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], \
-   I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
-   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)
-
-#define cimg_for7x7(img,x,y,z,c,I,T) \
-  cimg_for7((img)._height,y) for (int x = 0, \
-   _p3##x = 0, _p2##x = 0, _p1##x = 0, \
-   _n1##x = 1>=(img)._width?(img).width() - 1:1, \
-   _n2##x = 2>=(img)._width?(img).width() - 1:2, \
-   _n3##x = (int)( \
-   (I[0] = I[1] = I[2] = I[3] = (T)(img)(_p3##x,_p3##y,z,c)), \
-   (I[7] = I[8] = I[9] = I[10] = (T)(img)(0,_p2##y,z,c)), \
-   (I[14] = I[15] = I[16] = I[17] = (T)(img)(0,_p1##y,z,c)), \
-   (I[21] = I[22] = I[23] = I[24] = (T)(img)(0,y,z,c)), \
-   (I[28] = I[29] = I[30] = I[31] = (T)(img)(0,_n1##y,z,c)), \
-   (I[35] = I[36] = I[37] = I[38] = (T)(img)(0,_n2##y,z,c)), \
-   (I[42] = I[43] = I[44] = I[45] = (T)(img)(0,_n3##y,z,c)), \
-   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[11] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[18] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[25] = (T)(img)(_n1##x,y,z,c)), \
-   (I[32] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[39] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[46] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[12] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[19] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[26] = (T)(img)(_n2##x,y,z,c)), \
-   (I[33] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[40] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[47] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   3>=(img)._width?(img).width() - 1:3); \
-   (_n3##x<(img).width() && ( \
-   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[13] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[20] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[27] = (T)(img)(_n3##x,y,z,c)), \
-   (I[34] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[41] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[48] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
-   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3##x = _n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], \
-   I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], \
-   I[14] = I[15], I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], \
-   I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], I[26] = I[27], \
-   I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], \
-   I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], \
-   I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
-   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)
-
-#define cimg_for_in7x7(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in7((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p3##x = x - 3<0?0:x - 3, \
-   _p2##x = x - 2<0?0:x - 2, \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(int)(img)._width?(img).width() - 1:x + 1, \
-   _n2##x = x + 2>=(int)(img)._width?(img).width() - 1:x + 2, \
-   _n3##x = (int)( \
-   (I[0] = (T)(img)(_p3##x,_p3##y,z,c)), \
-   (I[7] = (T)(img)(_p3##x,_p2##y,z,c)), \
-   (I[14] = (T)(img)(_p3##x,_p1##y,z,c)), \
-   (I[21] = (T)(img)(_p3##x,y,z,c)), \
-   (I[28] = (T)(img)(_p3##x,_n1##y,z,c)), \
-   (I[35] = (T)(img)(_p3##x,_n2##y,z,c)), \
-   (I[42] = (T)(img)(_p3##x,_n3##y,z,c)), \
-   (I[1] = (T)(img)(_p2##x,_p3##y,z,c)), \
-   (I[8] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[15] = (T)(img)(_p2##x,_p1##y,z,c)), \
-   (I[22] = (T)(img)(_p2##x,y,z,c)), \
-   (I[29] = (T)(img)(_p2##x,_n1##y,z,c)), \
-   (I[36] = (T)(img)(_p2##x,_n2##y,z,c)), \
-   (I[43] = (T)(img)(_p2##x,_n3##y,z,c)), \
-   (I[2] = (T)(img)(_p1##x,_p3##y,z,c)), \
-   (I[9] = (T)(img)(_p1##x,_p2##y,z,c)), \
-   (I[16] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[23] = (T)(img)(_p1##x,y,z,c)), \
-   (I[30] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[37] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[44] = (T)(img)(_p1##x,_n3##y,z,c)), \
-   (I[3] = (T)(img)(x,_p3##y,z,c)), \
-   (I[10] = (T)(img)(x,_p2##y,z,c)), \
-   (I[17] = (T)(img)(x,_p1##y,z,c)), \
-   (I[24] = (T)(img)(x,y,z,c)), \
-   (I[31] = (T)(img)(x,_n1##y,z,c)), \
-   (I[38] = (T)(img)(x,_n2##y,z,c)), \
-   (I[45] = (T)(img)(x,_n3##y,z,c)), \
-   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[11] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[18] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[25] = (T)(img)(_n1##x,y,z,c)), \
-   (I[32] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[39] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[46] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[12] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[19] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[26] = (T)(img)(_n2##x,y,z,c)), \
-   (I[33] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[40] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[47] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   x + 3>=(int)(img)._width?(img).width() - 1:x + 3); \
-   x<=(int)(x1) && ((_n3##x<(img).width() && ( \
-   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[13] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[20] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[27] = (T)(img)(_n3##x,y,z,c)), \
-   (I[34] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[41] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[48] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
-   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3##x = _n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], \
-   I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], \
-   I[14] = I[15], I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], \
-   I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], I[26] = I[27], \
-   I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], \
-   I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], \
-   I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
-   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)
-
-#define cimg_for8x8(img,x,y,z,c,I,T) \
-  cimg_for8((img)._height,y) for (int x = 0, \
-   _p3##x = 0, _p2##x = 0, _p1##x = 0, \
-   _n1##x = 1>=((img)._width)?(img).width() - 1:1, \
-   _n2##x = 2>=((img)._width)?(img).width() - 1:2, \
-   _n3##x = 3>=((img)._width)?(img).width() - 1:3, \
-   _n4##x = (int)( \
-   (I[0] = I[1] = I[2] = I[3] = (T)(img)(_p3##x,_p3##y,z,c)), \
-   (I[8] = I[9] = I[10] = I[11] = (T)(img)(0,_p2##y,z,c)), \
-   (I[16] = I[17] = I[18] = I[19] = (T)(img)(0,_p1##y,z,c)), \
-   (I[24] = I[25] = I[26] = I[27] = (T)(img)(0,y,z,c)), \
-   (I[32] = I[33] = I[34] = I[35] = (T)(img)(0,_n1##y,z,c)), \
-   (I[40] = I[41] = I[42] = I[43] = (T)(img)(0,_n2##y,z,c)), \
-   (I[48] = I[49] = I[50] = I[51] = (T)(img)(0,_n3##y,z,c)), \
-   (I[56] = I[57] = I[58] = I[59] = (T)(img)(0,_n4##y,z,c)), \
-   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[12] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[20] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[28] = (T)(img)(_n1##x,y,z,c)), \
-   (I[36] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[44] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[52] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[60] = (T)(img)(_n1##x,_n4##y,z,c)), \
-   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[13] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[21] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[29] = (T)(img)(_n2##x,y,z,c)), \
-   (I[37] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[45] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[53] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   (I[61] = (T)(img)(_n2##x,_n4##y,z,c)), \
-   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[14] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[22] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[30] = (T)(img)(_n3##x,y,z,c)), \
-   (I[38] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[46] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[54] = (T)(img)(_n3##x,_n3##y,z,c)), \
-   (I[62] = (T)(img)(_n3##x,_n4##y,z,c)), \
-   4>=((img)._width)?(img).width() - 1:4); \
-   (_n4##x<(img).width() && ( \
-   (I[7] = (T)(img)(_n4##x,_p3##y,z,c)), \
-   (I[15] = (T)(img)(_n4##x,_p2##y,z,c)), \
-   (I[23] = (T)(img)(_n4##x,_p1##y,z,c)), \
-   (I[31] = (T)(img)(_n4##x,y,z,c)), \
-   (I[39] = (T)(img)(_n4##x,_n1##y,z,c)), \
-   (I[47] = (T)(img)(_n4##x,_n2##y,z,c)), \
-   (I[55] = (T)(img)(_n4##x,_n3##y,z,c)), \
-   (I[63] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
-   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], \
-   I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], \
-   I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
-   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], \
-   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], \
-   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], \
-   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[53] = I[54], I[54] = I[55], \
-   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[62] = I[63], \
-   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)
-
-#define cimg_for_in8x8(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in8((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p3##x = x - 3<0?0:x - 3, \
-   _p2##x = x - 2<0?0:x - 2, \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(img).width()?(img).width() - 1:x + 1, \
-   _n2##x = x + 2>=(img).width()?(img).width() - 1:x + 2, \
-   _n3##x = x + 3>=(img).width()?(img).width() - 1:x + 3, \
-   _n4##x = (int)( \
-   (I[0] = (T)(img)(_p3##x,_p3##y,z,c)), \
-   (I[8] = (T)(img)(_p3##x,_p2##y,z,c)), \
-   (I[16] = (T)(img)(_p3##x,_p1##y,z,c)), \
-   (I[24] = (T)(img)(_p3##x,y,z,c)), \
-   (I[32] = (T)(img)(_p3##x,_n1##y,z,c)), \
-   (I[40] = (T)(img)(_p3##x,_n2##y,z,c)), \
-   (I[48] = (T)(img)(_p3##x,_n3##y,z,c)), \
-   (I[56] = (T)(img)(_p3##x,_n4##y,z,c)), \
-   (I[1] = (T)(img)(_p2##x,_p3##y,z,c)), \
-   (I[9] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[17] = (T)(img)(_p2##x,_p1##y,z,c)), \
-   (I[25] = (T)(img)(_p2##x,y,z,c)), \
-   (I[33] = (T)(img)(_p2##x,_n1##y,z,c)), \
-   (I[41] = (T)(img)(_p2##x,_n2##y,z,c)), \
-   (I[49] = (T)(img)(_p2##x,_n3##y,z,c)), \
-   (I[57] = (T)(img)(_p2##x,_n4##y,z,c)), \
-   (I[2] = (T)(img)(_p1##x,_p3##y,z,c)), \
-   (I[10] = (T)(img)(_p1##x,_p2##y,z,c)), \
-   (I[18] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[26] = (T)(img)(_p1##x,y,z,c)), \
-   (I[34] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[42] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[50] = (T)(img)(_p1##x,_n3##y,z,c)), \
-   (I[58] = (T)(img)(_p1##x,_n4##y,z,c)), \
-   (I[3] = (T)(img)(x,_p3##y,z,c)), \
-   (I[11] = (T)(img)(x,_p2##y,z,c)), \
-   (I[19] = (T)(img)(x,_p1##y,z,c)), \
-   (I[27] = (T)(img)(x,y,z,c)), \
-   (I[35] = (T)(img)(x,_n1##y,z,c)), \
-   (I[43] = (T)(img)(x,_n2##y,z,c)), \
-   (I[51] = (T)(img)(x,_n3##y,z,c)), \
-   (I[59] = (T)(img)(x,_n4##y,z,c)), \
-   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[12] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[20] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[28] = (T)(img)(_n1##x,y,z,c)), \
-   (I[36] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[44] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[52] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[60] = (T)(img)(_n1##x,_n4##y,z,c)), \
-   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[13] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[21] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[29] = (T)(img)(_n2##x,y,z,c)), \
-   (I[37] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[45] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[53] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   (I[61] = (T)(img)(_n2##x,_n4##y,z,c)), \
-   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[14] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[22] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[30] = (T)(img)(_n3##x,y,z,c)), \
-   (I[38] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[46] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[54] = (T)(img)(_n3##x,_n3##y,z,c)), \
-   (I[62] = (T)(img)(_n3##x,_n4##y,z,c)), \
-   x + 4>=(img).width()?(img).width() - 1:x + 4); \
-   x<=(int)(x1) && ((_n4##x<(img).width() && ( \
-   (I[7] = (T)(img)(_n4##x,_p3##y,z,c)), \
-   (I[15] = (T)(img)(_n4##x,_p2##y,z,c)), \
-   (I[23] = (T)(img)(_n4##x,_p1##y,z,c)), \
-   (I[31] = (T)(img)(_n4##x,y,z,c)), \
-   (I[39] = (T)(img)(_n4##x,_n1##y,z,c)), \
-   (I[47] = (T)(img)(_n4##x,_n2##y,z,c)), \
-   (I[55] = (T)(img)(_n4##x,_n3##y,z,c)), \
-   (I[63] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
-   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], \
-   I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], \
-   I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
-   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], \
-   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], \
-   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], \
-   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[53] = I[54], I[54] = I[55], \
-   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[62] = I[63], \
-   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)
-
-#define cimg_for9x9(img,x,y,z,c,I,T) \
-  cimg_for9((img)._height,y) for (int x = 0, \
-   _p4##x = 0, _p3##x = 0, _p2##x = 0, _p1##x = 0, \
-   _n1##x = 1>=((img)._width)?(img).width() - 1:1, \
-   _n2##x = 2>=((img)._width)?(img).width() - 1:2, \
-   _n3##x = 3>=((img)._width)?(img).width() - 1:3, \
-   _n4##x = (int)( \
-   (I[0] = I[1] = I[2] = I[3] = I[4] = (T)(img)(_p4##x,_p4##y,z,c)), \
-   (I[9] = I[10] = I[11] = I[12] = I[13] = (T)(img)(0,_p3##y,z,c)), \
-   (I[18] = I[19] = I[20] = I[21] = I[22] = (T)(img)(0,_p2##y,z,c)), \
-   (I[27] = I[28] = I[29] = I[30] = I[31] = (T)(img)(0,_p1##y,z,c)), \
-   (I[36] = I[37] = I[38] = I[39] = I[40] = (T)(img)(0,y,z,c)), \
-   (I[45] = I[46] = I[47] = I[48] = I[49] = (T)(img)(0,_n1##y,z,c)), \
-   (I[54] = I[55] = I[56] = I[57] = I[58] = (T)(img)(0,_n2##y,z,c)), \
-   (I[63] = I[64] = I[65] = I[66] = I[67] = (T)(img)(0,_n3##y,z,c)), \
-   (I[72] = I[73] = I[74] = I[75] = I[76] = (T)(img)(0,_n4##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,_p4##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[23] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[32] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[41] = (T)(img)(_n1##x,y,z,c)), \
-   (I[50] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[59] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[68] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[77] = (T)(img)(_n1##x,_n4##y,z,c)), \
-   (I[6] = (T)(img)(_n2##x,_p4##y,z,c)), \
-   (I[15] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[24] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[33] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[42] = (T)(img)(_n2##x,y,z,c)), \
-   (I[51] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[60] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[69] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   (I[78] = (T)(img)(_n2##x,_n4##y,z,c)), \
-   (I[7] = (T)(img)(_n3##x,_p4##y,z,c)), \
-   (I[16] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[25] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[34] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[43] = (T)(img)(_n3##x,y,z,c)), \
-   (I[52] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[61] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[70] = (T)(img)(_n3##x,_n3##y,z,c)), \
-   (I[79] = (T)(img)(_n3##x,_n4##y,z,c)), \
-   4>=((img)._width)?(img).width() - 1:4); \
-   (_n4##x<(img).width() && ( \
-   (I[8] = (T)(img)(_n4##x,_p4##y,z,c)), \
-   (I[17] = (T)(img)(_n4##x,_p3##y,z,c)), \
-   (I[26] = (T)(img)(_n4##x,_p2##y,z,c)), \
-   (I[35] = (T)(img)(_n4##x,_p1##y,z,c)), \
-   (I[44] = (T)(img)(_n4##x,y,z,c)), \
-   (I[53] = (T)(img)(_n4##x,_n1##y,z,c)), \
-   (I[62] = (T)(img)(_n4##x,_n2##y,z,c)), \
-   (I[71] = (T)(img)(_n4##x,_n3##y,z,c)), \
-   (I[80] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
-   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], I[7] = I[8], \
-   I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], \
-   I[16] = I[17], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
-   I[24] = I[25], I[25] = I[26], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], \
-   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], \
-   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
-   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[54] = I[55], I[55] = I[56], \
-   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[63] = I[64], \
-   I[64] = I[65], I[65] = I[66], I[66] = I[67], I[67] = I[68], I[68] = I[69], I[69] = I[70], I[70] = I[71], \
-   I[72] = I[73], I[73] = I[74], I[74] = I[75], I[75] = I[76], I[76] = I[77], I[77] = I[78], I[78] = I[79], \
-   I[79] = I[80], \
-   _p4##x = _p3##x, _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)
-
-#define cimg_for_in9x9(img,x0,y0,x1,y1,x,y,z,c,I,T) \
-  cimg_for_in9((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p4##x = x - 4<0?0:x - 4, \
-   _p3##x = x - 3<0?0:x - 3, \
-   _p2##x = x - 2<0?0:x - 2, \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = x + 1>=(img).width()?(img).width() - 1:x + 1, \
-   _n2##x = x + 2>=(img).width()?(img).width() - 1:x + 2, \
-   _n3##x = x + 3>=(img).width()?(img).width() - 1:x + 3, \
-   _n4##x = (int)( \
-   (I[0] = (T)(img)(_p4##x,_p4##y,z,c)), \
-   (I[9] = (T)(img)(_p4##x,_p3##y,z,c)), \
-   (I[18] = (T)(img)(_p4##x,_p2##y,z,c)), \
-   (I[27] = (T)(img)(_p4##x,_p1##y,z,c)), \
-   (I[36] = (T)(img)(_p4##x,y,z,c)), \
-   (I[45] = (T)(img)(_p4##x,_n1##y,z,c)), \
-   (I[54] = (T)(img)(_p4##x,_n2##y,z,c)), \
-   (I[63] = (T)(img)(_p4##x,_n3##y,z,c)), \
-   (I[72] = (T)(img)(_p4##x,_n4##y,z,c)), \
-   (I[1] = (T)(img)(_p3##x,_p4##y,z,c)), \
-   (I[10] = (T)(img)(_p3##x,_p3##y,z,c)), \
-   (I[19] = (T)(img)(_p3##x,_p2##y,z,c)), \
-   (I[28] = (T)(img)(_p3##x,_p1##y,z,c)), \
-   (I[37] = (T)(img)(_p3##x,y,z,c)), \
-   (I[46] = (T)(img)(_p3##x,_n1##y,z,c)), \
-   (I[55] = (T)(img)(_p3##x,_n2##y,z,c)), \
-   (I[64] = (T)(img)(_p3##x,_n3##y,z,c)), \
-   (I[73] = (T)(img)(_p3##x,_n4##y,z,c)), \
-   (I[2] = (T)(img)(_p2##x,_p4##y,z,c)), \
-   (I[11] = (T)(img)(_p2##x,_p3##y,z,c)), \
-   (I[20] = (T)(img)(_p2##x,_p2##y,z,c)), \
-   (I[29] = (T)(img)(_p2##x,_p1##y,z,c)), \
-   (I[38] = (T)(img)(_p2##x,y,z,c)), \
-   (I[47] = (T)(img)(_p2##x,_n1##y,z,c)), \
-   (I[56] = (T)(img)(_p2##x,_n2##y,z,c)), \
-   (I[65] = (T)(img)(_p2##x,_n3##y,z,c)), \
-   (I[74] = (T)(img)(_p2##x,_n4##y,z,c)), \
-   (I[3] = (T)(img)(_p1##x,_p4##y,z,c)), \
-   (I[12] = (T)(img)(_p1##x,_p3##y,z,c)), \
-   (I[21] = (T)(img)(_p1##x,_p2##y,z,c)), \
-   (I[30] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[39] = (T)(img)(_p1##x,y,z,c)), \
-   (I[48] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[57] = (T)(img)(_p1##x,_n2##y,z,c)), \
-   (I[66] = (T)(img)(_p1##x,_n3##y,z,c)), \
-   (I[75] = (T)(img)(_p1##x,_n4##y,z,c)), \
-   (I[4] = (T)(img)(x,_p4##y,z,c)), \
-   (I[13] = (T)(img)(x,_p3##y,z,c)), \
-   (I[22] = (T)(img)(x,_p2##y,z,c)), \
-   (I[31] = (T)(img)(x,_p1##y,z,c)), \
-   (I[40] = (T)(img)(x,y,z,c)), \
-   (I[49] = (T)(img)(x,_n1##y,z,c)), \
-   (I[58] = (T)(img)(x,_n2##y,z,c)), \
-   (I[67] = (T)(img)(x,_n3##y,z,c)), \
-   (I[76] = (T)(img)(x,_n4##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,_p4##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,_p3##y,z,c)), \
-   (I[23] = (T)(img)(_n1##x,_p2##y,z,c)), \
-   (I[32] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[41] = (T)(img)(_n1##x,y,z,c)), \
-   (I[50] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[59] = (T)(img)(_n1##x,_n2##y,z,c)), \
-   (I[68] = (T)(img)(_n1##x,_n3##y,z,c)), \
-   (I[77] = (T)(img)(_n1##x,_n4##y,z,c)), \
-   (I[6] = (T)(img)(_n2##x,_p4##y,z,c)), \
-   (I[15] = (T)(img)(_n2##x,_p3##y,z,c)), \
-   (I[24] = (T)(img)(_n2##x,_p2##y,z,c)), \
-   (I[33] = (T)(img)(_n2##x,_p1##y,z,c)), \
-   (I[42] = (T)(img)(_n2##x,y,z,c)), \
-   (I[51] = (T)(img)(_n2##x,_n1##y,z,c)), \
-   (I[60] = (T)(img)(_n2##x,_n2##y,z,c)), \
-   (I[69] = (T)(img)(_n2##x,_n3##y,z,c)), \
-   (I[78] = (T)(img)(_n2##x,_n4##y,z,c)), \
-   (I[7] = (T)(img)(_n3##x,_p4##y,z,c)), \
-   (I[16] = (T)(img)(_n3##x,_p3##y,z,c)), \
-   (I[25] = (T)(img)(_n3##x,_p2##y,z,c)), \
-   (I[34] = (T)(img)(_n3##x,_p1##y,z,c)), \
-   (I[43] = (T)(img)(_n3##x,y,z,c)), \
-   (I[52] = (T)(img)(_n3##x,_n1##y,z,c)), \
-   (I[61] = (T)(img)(_n3##x,_n2##y,z,c)), \
-   (I[70] = (T)(img)(_n3##x,_n3##y,z,c)), \
-   (I[79] = (T)(img)(_n3##x,_n4##y,z,c)), \
-   x + 4>=(img).width()?(img).width() - 1:x + 4); \
-   x<=(int)(x1) && ((_n4##x<(img).width() && ( \
-   (I[8] = (T)(img)(_n4##x,_p4##y,z,c)), \
-   (I[17] = (T)(img)(_n4##x,_p3##y,z,c)), \
-   (I[26] = (T)(img)(_n4##x,_p2##y,z,c)), \
-   (I[35] = (T)(img)(_n4##x,_p1##y,z,c)), \
-   (I[44] = (T)(img)(_n4##x,y,z,c)), \
-   (I[53] = (T)(img)(_n4##x,_n1##y,z,c)), \
-   (I[62] = (T)(img)(_n4##x,_n2##y,z,c)), \
-   (I[71] = (T)(img)(_n4##x,_n3##y,z,c)), \
-   (I[80] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
-   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x)); \
-   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], I[7] = I[8], \
-   I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], \
-   I[16] = I[17], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
-   I[24] = I[25], I[25] = I[26], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], \
-   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], \
-   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
-   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[54] = I[55], I[55] = I[56], \
-   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[63] = I[64], \
-   I[64] = I[65], I[65] = I[66], I[66] = I[67], I[67] = I[68], I[68] = I[69], I[69] = I[70], I[70] = I[71], \
-   I[72] = I[73], I[73] = I[74], I[74] = I[75], I[75] = I[76], I[76] = I[77], I[77] = I[78], I[78] = I[79], \
-   I[79] = I[80], \
-   _p4##x = _p3##x, _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)
-
-#define cimg_for2x2x2(img,x,y,z,c,I,T) \
- cimg_for2((img)._depth,z) cimg_for2((img)._height,y) for (int x = 0, \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(0,y,z,c)), \
-   (I[2] = (T)(img)(0,_n1##y,z,c)), \
-   (I[4] = (T)(img)(0,y,_n1##z,c)), \
-   (I[6] = (T)(img)(0,_n1##y,_n1##z,c)), \
-   1>=(img)._width?(img).width() - 1:1); \
-   (_n1##x<(img).width() && ( \
-   (I[1] = (T)(img)(_n1##x,y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,_n1##z,c)), \
-   (I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
-   x==--_n1##x; \
-   I[0] = I[1], I[2] = I[3], I[4] = I[5], I[6] = I[7], \
-   ++x, ++_n1##x)
-
-#define cimg_for_in2x2x2(img,x0,y0,z0,x1,y1,z1,x,y,z,c,I,T) \
- cimg_for_in2((img)._depth,z0,z1,z) cimg_for_in2((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(x,y,z,c)), \
-   (I[2] = (T)(img)(x,_n1##y,z,c)), \
-   (I[4] = (T)(img)(x,y,_n1##z,c)), \
-   (I[6] = (T)(img)(x,_n1##y,_n1##z,c)), \
-   x + 1>=(int)(img)._width?(img).width() - 1:x + 1); \
-   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
-   (I[1] = (T)(img)(_n1##x,y,z,c)), \
-   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,_n1##z,c)), \
-   (I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
-   x==--_n1##x); \
-   I[0] = I[1], I[2] = I[3], I[4] = I[5], I[6] = I[7], \
-   ++x, ++_n1##x)
-
-#define cimg_for3x3x3(img,x,y,z,c,I,T) \
- cimg_for3((img)._depth,z) cimg_for3((img)._height,y) for (int x = 0, \
-   _p1##x = 0, \
-   _n1##x = (int)( \
-   (I[0] = I[1] = (T)(img)(_p1##x,_p1##y,_p1##z,c)), \
-   (I[3] = I[4] = (T)(img)(0,y,_p1##z,c)),  \
-   (I[6] = I[7] = (T)(img)(0,_n1##y,_p1##z,c)), \
-   (I[9] = I[10] = (T)(img)(0,_p1##y,z,c)), \
-   (I[12] = I[13] = (T)(img)(0,y,z,c)), \
-   (I[15] = I[16] = (T)(img)(0,_n1##y,z,c)), \
-   (I[18] = I[19] = (T)(img)(0,_p1##y,_n1##z,c)), \
-   (I[21] = I[22] = (T)(img)(0,y,_n1##z,c)), \
-   (I[24] = I[25] = (T)(img)(0,_n1##y,_n1##z,c)), \
-   1>=(img)._width?(img).width() - 1:1); \
-   (_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,_p1##z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c)), \
-   (I[11] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,y,z,c)), \
-   (I[17] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c)), \
-   (I[23] = (T)(img)(_n1##x,y,_n1##z,c)), \
-   (I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
-   x==--_n1##x; \
-   I[0] = I[1], I[1] = I[2], I[3] = I[4], I[4] = I[5], I[6] = I[7], I[7] = I[8], \
-   I[9] = I[10], I[10] = I[11], I[12] = I[13], I[13] = I[14], I[15] = I[16], I[16] = I[17], \
-   I[18] = I[19], I[19] = I[20], I[21] = I[22], I[22] = I[23], I[24] = I[25], I[25] = I[26], \
-   _p1##x = x++, ++_n1##x)
-
-#define cimg_for_in3x3x3(img,x0,y0,z0,x1,y1,z1,x,y,z,c,I,T) \
- cimg_for_in3((img)._depth,z0,z1,z) cimg_for_in3((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
-   _p1##x = x - 1<0?0:x - 1, \
-   _n1##x = (int)( \
-   (I[0] = (T)(img)(_p1##x,_p1##y,_p1##z,c)), \
-   (I[3] = (T)(img)(_p1##x,y,_p1##z,c)),  \
-   (I[6] = (T)(img)(_p1##x,_n1##y,_p1##z,c)), \
-   (I[9] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[12] = (T)(img)(_p1##x,y,z,c)), \
-   (I[15] = (T)(img)(_p1##x,_n1##y,z,c)), \
-   (I[18] = (T)(img)(_p1##x,_p1##y,_n1##z,c)), \
-   (I[21] = (T)(img)(_p1##x,y,_n1##z,c)), \
-   (I[24] = (T)(img)(_p1##x,_n1##y,_n1##z,c)), \
-   (I[1] = (T)(img)(x,_p1##y,_p1##z,c)), \
-   (I[4] = (T)(img)(x,y,_p1##z,c)),  \
-   (I[7] = (T)(img)(x,_n1##y,_p1##z,c)), \
-   (I[10] = (T)(img)(x,_p1##y,z,c)), \
-   (I[13] = (T)(img)(x,y,z,c)), \
-   (I[16] = (T)(img)(x,_n1##y,z,c)), \
-   (I[19] = (T)(img)(x,_p1##y,_n1##z,c)), \
-   (I[22] = (T)(img)(x,y,_n1##z,c)), \
-   (I[25] = (T)(img)(x,_n1##y,_n1##z,c)), \
-   x + 1>=(int)(img)._width?(img).width() - 1:x + 1); \
-   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,_p1##z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c)), \
-   (I[11] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[14] = (T)(img)(_n1##x,y,z,c)), \
-   (I[17] = (T)(img)(_n1##x,_n1##y,z,c)), \
-   (I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c)), \
-   (I[23] = (T)(img)(_n1##x,y,_n1##z,c)), \
-   (I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
-   x==--_n1##x); \
-   I[0] = I[1], I[1] = I[2], I[3] = I[4], I[4] = I[5], I[6] = I[7], I[7] = I[8], \
-   I[9] = I[10], I[10] = I[11], I[12] = I[13], I[13] = I[14], I[15] = I[16], I[16] = I[17], \
-   I[18] = I[19], I[19] = I[20], I[21] = I[22], I[22] = I[23], I[24] = I[25], I[25] = I[26], \
-   _p1##x = x++, ++_n1##x)
-
-#define cimglist_for(list,l) for (int l = 0; l<(int)(list)._width; ++l)
-#define cimglist_for_in(list,l0,l1,l) \
-  for (int l = (int)(l0)<0?0:(int)(l0), _max##l = (unsigned int)l1<(list)._width?(int)(l1):(int)(list)._width - 1; \
-  l<=_max##l; ++l)
-
-#define cimglist_apply(list,fn) cimglist_for(list,__##fn) (list)[__##fn].fn
-
-// Macros used to display error messages when exceptions are thrown.
-// You should not use these macros is your own code.
-#define _cimgdisplay_instance "[instance(%u,%u,%u,%c%s%c)] CImgDisplay::"
-#define cimgdisplay_instance _width,_height,_normalization,_title?'\"':'[',_title?_title:"untitled",_title?'\"':']'
-#define _cimg_instance "[instance(%u,%u,%u,%u,%p,%sshared)] CImg<%s>::"
-#define cimg_instance _width,_height,_depth,_spectrum,_data,_is_shared?"":"non-",pixel_type()
-#define _cimglist_instance "[instance(%u,%u,%p)] CImgList<%s>::"
-#define cimglist_instance _width,_allocated_width,_data,pixel_type()
-
-/*------------------------------------------------
- #
- #
- #  Define cimg_library:: namespace
- #
- #
- -------------------------------------------------*/
-//! Contains <i>all classes and functions</i> of the \CImg library.
-/**
-   This namespace is defined to avoid functions and class names collisions
-   that could happen with the inclusion of other C++ header files.
-   Anyway, it should not happen often and you should reasonnably start most of your
-   \CImg-based programs with
-   \code
-   #include "CImg.h"
-   using namespace cimg_library;
-   \endcode
-   to simplify the declaration of \CImg Library objects afterwards.
-**/
-namespace cimg_library_suffixed {
-
-  // Declare the four classes of the CImg Library.
-  template<typename T=float> struct CImg;
-  template<typename T=float> struct CImgList;
-  struct CImgDisplay;
-  struct CImgException;
-
-  // Declare cimg:: namespace.
-  // This is an uncomplete namespace definition here. It only contains some
-  // necessary stuff to ensure a correct declaration order of the classes and functions
-  // defined afterwards.
-  namespace cimg {
-
-    // Define ascii sequences for colored terminal output.
-#ifdef cimg_use_vt100
-    static const char t_normal[] = { 0x1b, '[', '0', ';', '0', ';', '0', 'm', 0 };
-    static const char t_black[] = { 0x1b, '[', '0', ';', '3', '0', ';', '5', '9', 'm', 0 };
-    static const char t_red[] = { 0x1b, '[', '0', ';', '3', '1', ';', '5', '9', 'm', 0 };
-    static const char t_green[] = { 0x1b, '[', '0', ';', '3', '2', ';', '5', '9', 'm', 0 };
-    static const char t_yellow[] = { 0x1b, '[', '0', ';', '3', '3', ';', '5', '9', 'm', 0 };
-    static const char t_blue[] = { 0x1b, '[', '0', ';', '3', '4', ';', '5', '9', 'm', 0 };
-    static const char t_magenta[] = { 0x1b, '[', '0', ';', '3', '5', ';', '5', '9', 'm', 0 };
-    static const char t_cyan[] = { 0x1b, '[', '0', ';', '3', '6', ';', '5', '9', 'm', 0 };
-    static const char t_white[] = { 0x1b, '[', '0', ';', '3', '7', ';', '5', '9', 'm', 0 };
-    static const char t_bold[] = { 0x1b, '[', '1', 'm', 0 };
-    static const char t_underscore[] = { 0x1b, '[', '4', 'm', 0 };
-#else
-    static const char t_normal[] = { 0 };
-    static const char *const t_black = cimg::t_normal,
-      *const t_red = cimg::t_normal,
-      *const t_green = cimg::t_normal,
-      *const t_yellow = cimg::t_normal,
-      *const t_blue = cimg::t_normal,
-      *const t_magenta = cimg::t_normal,
-      *const t_cyan = cimg::t_normal,
-      *const t_white = cimg::t_normal,
-      *const t_bold = cimg::t_normal,
-      *const t_underscore = cimg::t_normal;
-#endif
-
-    inline std::FILE* output(std::FILE *file=0);
-    inline void info();
-
-    //! Avoid warning messages due to unused parameters. Do nothing actually.
-    template<typename T>
-    inline void unused(const T&, ...) {}
-
-    // [internal] Lock/unlock a mutex for managing concurrent threads.
-    // 'lock_mode' can be { 0=unlock | 1=lock | 2=trylock }.
-    // 'n' can be in [0,31] but mutex range [0,15] is reserved by CImg.
-    inline int mutex(const unsigned int n, const int lock_mode=1);
-
-    inline unsigned int& _exception_mode(const unsigned int value, const bool is_set) {
-      static unsigned int mode = cimg_verbosity;
-      if (is_set) { cimg::mutex(0); mode = value<4?value:4; cimg::mutex(0,0); }
-      return mode;
-    }
-
-    // Functions to return standard streams 'stdin', 'stdout' and 'stderr'.
-    inline FILE* _stdin(const bool throw_exception=true);
-    inline FILE* _stdout(const bool throw_exception=true);
-    inline FILE* _stderr(const bool throw_exception=true);
-
-    // Mandatory because Microsoft's _snprintf() and _vsnprintf() do not add the '\0' character
-    // at the end of the string.
-#if cimg_OS==2 && defined(_MSC_VER)
-    inline int _snprintf(char *const s, const size_t size, const char *const format, ...) {
-      va_list ap;
-      va_start(ap,format);
-      const int result = _vsnprintf(s,size,format,ap);
-      va_end(ap);
-      return result;
-    }
-
-    inline int _vsnprintf(char *const s, const size_t size, const char *const format, va_list ap) {
-      int result = -1;
-      cimg::mutex(6);
-      if (size) result = _vsnprintf_s(s,size,_TRUNCATE,format,ap);
-      if (result==-1) result = _vscprintf(format,ap);
-      cimg::mutex(6,0);
-      return result;
-    }
-
-    // Mutex-protected version of sscanf, sprintf and snprintf.
-    // Used only MacOSX, as it seems those functions are not re-entrant on MacOSX.
-#elif defined(__MACOSX__) || defined(__APPLE__)
-    inline int _sscanf(const char *const s, const char *const format, ...) {
-      cimg::mutex(6);
-      va_list args;
-      va_start(args,format);
-      const int result = std::vsscanf(s,format,args);
-      va_end(args);
-      cimg::mutex(6,0);
-      return result;
-    }
-
-    inline int _sprintf(char *const s, const char *const format, ...) {
-      cimg::mutex(6);
-      va_list args;
-      va_start(args,format);
-      const int result = std::vsprintf(s,format,args);
-      va_end(args);
-      cimg::mutex(6,0);
-      return result;
-    }
-
-    inline int _snprintf(char *const s, const size_t n, const char *const format, ...) {
-      cimg::mutex(6);
-      va_list args;
-      va_start(args,format);
-      const int result = std::vsnprintf(s,n,format,args);
-      va_end(args);
-      cimg::mutex(6,0);
-      return result;
-    }
-
-    inline int _vsnprintf(char *const s, const size_t size, const char* format, va_list ap) {
-      cimg::mutex(6);
-      const int result = std::vsnprintf(s,size,format,ap);
-      cimg::mutex(6,0);
-      return result;
-    }
-#endif
-
-    //! Set current \CImg exception mode.
-    /**
-       The way error messages are handled by \CImg can be changed dynamically, using this function.
-       \param mode Desired exception mode. Possible values are:
-       - \c 0: Hide library messages (quiet mode).
-       - \c 1: Print library messages on the console.
-       - \c 2: Display library messages on a dialog window.
-       - \c 3: Do as \c 1 + add extra debug warnings (slow down the code!).
-       - \c 4: Do as \c 2 + add extra debug warnings (slow down the code!).
-     **/
-    inline unsigned int& exception_mode(const unsigned int mode) {
-      return _exception_mode(mode,true);
-    }
-
-    //! Return current \CImg exception mode.
-    /**
-       \note By default, return the value of configuration macro \c cimg_verbosity
-    **/
-    inline unsigned int& exception_mode() {
-      return _exception_mode(0,false);
-    }
-
-    //! Set current \CImg openmp mode.
-    /**
-       The way openmp-based methods are handled by \CImg can be changed dynamically, using this function.
-       \param mode Desired openmp mode. Possible values are:
-       - \c 0: Never parallelize.
-       - \c 1: Always parallelize.
-       - \c 2: Adaptive parallelization mode (default behavior).
-     **/
-    inline unsigned int& _openmp_mode(const unsigned int value, const bool is_set) {
-      static unsigned int mode = 2;
-      if (is_set)  { cimg::mutex(0); mode = value<2?value:2; cimg::mutex(0,0); }
-      return mode;
-    }
-
-    inline unsigned int& openmp_mode(const unsigned int mode) {
-      return _openmp_mode(mode,true);
-    }
-
-    //! Return current \CImg openmp mode.
-    inline unsigned int& openmp_mode() {
-      return _openmp_mode(0,false);
-    }
-
-#define cimg_openmp_if(cond) if (cimg::openmp_mode()==1 || (cimg::openmp_mode()>1 && (cond)))
-
-    // Display a simple dialog box, and wait for the user's response.
-    inline int dialog(const char *const title, const char *const msg, const char *const button1_label="OK",
-                      const char *const button2_label=0, const char *const button3_label=0,
-                      const char *const button4_label=0, const char *const button5_label=0,
-                      const char *const button6_label=0, const bool centering=false);
-
-    // Evaluate math expression.
-    inline double eval(const char *const expression,
-                       const double x=0, const double y=0, const double z=0, const double c=0);
-
-  }
-
-  /*---------------------------------------
-    #
-    # Define the CImgException structures
-    #
-    --------------------------------------*/
-  //! Instances of \c CImgException are thrown when errors are encountered in a \CImg function call.
-  /**
-     \par Overview
-
-      CImgException is the base class of all exceptions thrown by \CImg (except \b CImgAbortException).
-      CImgException is never thrown itself. Derived classes that specify the type of errord are thrown instead.
-      These classes can be:
-
-      - \b CImgAbortException: Thrown when a computationally-intensive function is aborted by an external signal.
-        This is the only \c non-derived exception class.
-
-      - \b CImgArgumentException: Thrown when one argument of a called \CImg function is invalid.
-      This is probably one of the most thrown exception by \CImg.
-      For instance, the following example throws a \c CImgArgumentException:
-      \code
-      CImg<float> img(100,100,1,3); // Define a 100x100 color image with float-valued pixels.
-      img.mirror('e');              // Try to mirror image along the (non-existing) 'e'-axis.
-      \endcode
-
-      - \b CImgDisplayException: Thrown when something went wrong during the display of images in CImgDisplay instances.
-
-      - \b CImgInstanceException: Thrown when an instance associated to a called \CImg method does not fit
-      the function requirements. For instance, the following example throws a \c CImgInstanceException:
-      \code
-      const CImg<float> img;           // Define an empty image.
-      const float value = img.at(0);   // Try to read first pixel value (does not exist).
-      \endcode
-
-      - \b CImgIOException: Thrown when an error occured when trying to load or save image files.
-      This happens when trying to read files that do not exist or with invalid formats.
-      For instance, the following example throws a \c CImgIOException:
-      \code
-      const CImg<float> img("missing_file.jpg");  // Try to load a file that does not exist.
-      \endcode
-
-      - \b CImgWarningException: Thrown only if configuration macro \c cimg_strict_warnings is set, and
-      when a \CImg function has to display a warning message (see cimg::warn()).
-
-      It is not recommended to throw CImgException instances by yourself,
-      since they are expected to be thrown only by \CImg.
-      When an error occurs in a library function call, \CImg may display error messages on the screen or on the
-      standard output, depending on the current \CImg exception mode.
-      The \CImg exception mode can be get and set by functions cimg::exception_mode() and
-      cimg::exception_mode(unsigned int).
-
-      \par Exceptions handling
-
-      In all cases, when an error occurs in \CImg, an instance of the corresponding exception class is thrown.
-      This may lead the program to break (this is the default behavior), but you can bypass this behavior by
-      handling the exceptions by yourself,
-      using a usual <tt>try { ... } catch () { ... }</tt> bloc, as in the following example:
-      \code
-      #define "CImg.h"
-      using namespace cimg_library;
-      int main() {
-        cimg::exception_mode(0);                                    // Enable quiet exception mode.
-        try {
-          ...                                                       // Here, do what you want to stress CImg.
-        } catch (CImgException& e) {                                // You succeeded: something went wrong!
-          std::fprintf(stderr,"CImg Library Error: %s",e.what());   // Display your custom error message.
-          ...                                                       // Do what you want now to save the ship!
-          }
-        }
-      \endcode
-  **/
-  struct CImgException : public std::exception {
-#define _cimg_exception_err(etype,disp_flag) \
-  std::va_list ap, ap2; \
-  va_start(ap,format); va_start(ap2,format); \
-  int size = cimg_vsnprintf(0,0,format,ap2); \
-  if (size++>=0) { \
-    delete[] _message; \
-    _message = new char[size]; \
-    cimg_vsnprintf(_message,size,format,ap); \
-    if (cimg::exception_mode()) { \
-      std::fprintf(cimg::output(),"\n%s[CImg] *** %s ***%s %s\n",cimg::t_red,etype,cimg::t_normal,_message); \
-      if (cimg_display && disp_flag && !(cimg::exception_mode()%2)) try { cimg::dialog(etype,_message,"Abort"); } \
-      catch (CImgException&) {} \
-      if (cimg::exception_mode()>=3) cimg_library_suffixed::cimg::info(); \
-    } \
-  } \
-  va_end(ap); va_end(ap2); \
-
-    char *_message;
-    CImgException() { _message = new char[1]; *_message = 0; }
-    CImgException(const char *const format, ...):_message(0) { _cimg_exception_err("CImgException",true); }
-    CImgException(const CImgException& e):std::exception(e) {
-      const size_t size = std::strlen(e._message);
-      _message = new char[size + 1];
-      std::strncpy(_message,e._message,size);
-      _message[size] = 0;
-    }
-    ~CImgException() throw() { delete[] _message; }
-    CImgException& operator=(const CImgException& e) {
-      const size_t size = std::strlen(e._message);
-      _message = new char[size + 1];
-      std::strncpy(_message,e._message,size);
-      _message[size] = 0;
-      return *this;
-    }
-    //! Return a C-string containing the error message associated to the thrown exception.
-    const char *what() const throw() { return _message; }
-  };
-
-  // The CImgAbortException class is used to throw an exception when
-  // a computationally-intensive function has been aborted by an external signal.
-  struct CImgAbortException : public std::exception {
-    char *_message;
-    CImgAbortException() { _message = new char[1]; *_message = 0; }
-    CImgAbortException(const char *const format, ...):_message(0) { _cimg_exception_err("CImgAbortException",true); }
-    CImgAbortException(const CImgAbortException& e):std::exception(e) {
-      const size_t size = std::strlen(e._message);
-      _message = new char[size + 1];
-      std::strncpy(_message,e._message,size);
-      _message[size] = 0;
-    }
-    ~CImgAbortException() throw() { delete[] _message; }
-    CImgAbortException& operator=(const CImgAbortException& e) {
-      const size_t size = std::strlen(e._message);
-      _message = new char[size + 1];
-      std::strncpy(_message,e._message,size);
-      _message[size] = 0;
-      return *this;
-    }
-    //! Return a C-string containing the error message associated to the thrown exception.
-    const char *what() const throw() { return _message; }
-  };
-
-  // The CImgArgumentException class is used to throw an exception related
-  // to invalid arguments encountered in a library function call.
-  struct CImgArgumentException : public CImgException {
-    CImgArgumentException(const char *const format, ...) { _cimg_exception_err("CImgArgumentException",true); }
-  };
-
-  // The CImgDisplayException class is used to throw an exception related
-  // to display problems encountered in a library function call.
-  struct CImgDisplayException : public CImgException {
-    CImgDisplayException(const char *const format, ...) { _cimg_exception_err("CImgDisplayException",false); }
-  };
-
-  // The CImgInstanceException class is used to throw an exception related
-  // to an invalid instance encountered in a library function call.
-  struct CImgInstanceException : public CImgException {
-    CImgInstanceException(const char *const format, ...) { _cimg_exception_err("CImgInstanceException",true); }
-  };
-
-  // The CImgIOException class is used to throw an exception related
-  // to input/output file problems encountered in a library function call.
-  struct CImgIOException : public CImgException {
-    CImgIOException(const char *const format, ...) { _cimg_exception_err("CImgIOException",true); }
-  };
-
-  // The CImgWarningException class is used to throw an exception for warnings
-  // encountered in a library function call.
-  struct CImgWarningException : public CImgException {
-    CImgWarningException(const char *const format, ...) { _cimg_exception_err("CImgWarningException",false); }
-  };
-
-  /*-------------------------------------
-    #
-    # Define cimg:: namespace
-    #
-    -----------------------------------*/
-  //! Contains \a low-level functions and variables of the \CImg Library.
-  /**
-     Most of the functions and variables within this namespace are used by the \CImg library for low-level operations.
-     You may use them to access specific const values or environment variables internally used by \CImg.
-     \warning Never write <tt>using namespace cimg_library::cimg;</tt> in your source code. Lot of functions in the
-     <tt>cimg:: namespace</tt> have the same names as standard C functions that may be defined in the global
-     namespace <tt>::</tt>.
-  **/
-  namespace cimg {
-
-    // Define traits that will be used to determine the best data type to work in CImg functions.
-    //
-    template<typename T> struct type {
-      static const char* string() {
-        static const char* s[] = { "unknown",   "unknown8",   "unknown16",  "unknown24",
-                                   "unknown32", "unknown40",  "unknown48",  "unknown56",
-                                   "unknown64", "unknown72",  "unknown80",  "unknown88",
-                                   "unknown96", "unknown104", "unknown112", "unknown120",
-                                   "unknown128" };
-        return s[(sizeof(T)<17)?sizeof(T):0];
-      }
-      static bool is_float() { return false; }
-      static bool is_inf(const T) { return false; }
-      static bool is_nan(const T) { return false; }
-      static T min() { return ~max(); }
-      static T max() { return (T)1<<(8*sizeof(T) - 1); }
-      static T inf() { return max(); }
-      static T cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(T)val; }
-      static const char* format() { return "%s"; }
-      static const char* format_s() { return "%s"; }
-      static const char* format(const T& val) { static const char *const s = "unknown"; cimg::unused(val); return s; }
-    };
-
-    template<> struct type<bool> {
-      static const char* string() { static const char *const s = "bool"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const bool) { return false; }
-      static bool is_nan(const bool) { return false; }
-      static bool min() { return false; }
-      static bool max() { return true; }
-      static bool inf() { return max(); }
-      static bool is_inf() { return false; }
-      static bool cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(bool)val; }
-      static const char* format() { return "%s"; }
-      static const char* format_s() { return "%s"; }
-      static const char* format(const bool val) { static const char* s[] = { "false", "true" }; return s[val?1:0]; }
-    };
-
-    template<> struct type<unsigned char> {
-      static const char* string() { static const char *const s = "unsigned char"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const unsigned char) { return false; }
-      static bool is_nan(const unsigned char) { return false; }
-      static unsigned char min() { return 0; }
-      static unsigned char max() { return (unsigned char)-1; }
-      static unsigned char inf() { return max(); }
-      static unsigned char cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(unsigned char)val; }
-      static const char* format() { return "%u"; }
-      static const char* format_s() { return "%u"; }
-      static unsigned int format(const unsigned char val) { return (unsigned int)val; }
-    };
-
-#if defined(CHAR_MAX) && CHAR_MAX==255
-    template<> struct type<char> {
-      static const char* string() { static const char *const s = "char"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const char) { return false; }
-      static bool is_nan(const char) { return false; }
-      static char min() { return 0; }
-      static char max() { return (char)-1; }
-      static char inf() { return max(); }
-      static char cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(unsigned char)val; }
-      static const char* format() { return "%u"; }
-      static const char* format_s() { return "%u"; }
-      static unsigned int format(const char val) { return (unsigned int)val; }
-    };
-#else
-    template<> struct type<char> {
-      static const char* string() { static const char *const s = "char"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const char) { return false; }
-      static bool is_nan(const char) { return false; }
-      static char min() { return ~max(); }
-      static char max() { return (char)((unsigned char)-1>>1); }
-      static char inf() { return max(); }
-      static char cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(char)val; }
-      static const char* format() { return "%d"; }
-      static const char* format_s() { return "%d"; }
-      static int format(const char val) { return (int)val; }
-    };
-#endif
-
-    template<> struct type<signed char> {
-      static const char* string() { static const char *const s = "signed char"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const signed char) { return false; }
-      static bool is_nan(const signed char) { return false; }
-      static signed char min() { return ~max(); }
-      static signed char max() { return (signed char)((unsigned char)-1>>1); }
-      static signed char inf() { return max(); }
-      static signed char cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(signed char)val; }
-      static const char* format() { return "%d"; }
-      static const char* format_s() { return "%d"; }
-      static int format(const signed char val) { return (int)val; }
-    };
-
-    template<> struct type<unsigned short> {
-      static const char* string() { static const char *const s = "unsigned short"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const unsigned short) { return false; }
-      static bool is_nan(const unsigned short) { return false; }
-      static unsigned short min() { return 0; }
-      static unsigned short max() { return (unsigned short)-1; }
-      static unsigned short inf() { return max(); }
-      static unsigned short cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(unsigned short)val; }
-      static const char* format() { return "%u"; }
-      static const char* format_s() { return "%u"; }
-      static unsigned int format(const unsigned short val) { return (unsigned int)val; }
-    };
-
-    template<> struct type<short> {
-      static const char* string() { static const char *const s = "short"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const short) { return false; }
-      static bool is_nan(const short) { return false; }
-      static short min() { return ~max(); }
-      static short max() { return (short)((unsigned short)-1>>1); }
-      static short inf() { return max(); }
-      static short cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(short)val; }
-      static const char* format() { return "%d"; }
-      static const char* format_s() { return "%d"; }
-      static int format(const short val) { return (int)val; }
-    };
-
-    template<> struct type<unsigned int> {
-      static const char* string() { static const char *const s = "unsigned int"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const unsigned int) { return false; }
-      static bool is_nan(const unsigned int) { return false; }
-      static unsigned int min() { return 0; }
-      static unsigned int max() { return (unsigned int)-1; }
-      static unsigned int inf() { return max(); }
-      static unsigned int cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(unsigned int)val; }
-      static const char* format() { return "%u"; }
-      static const char* format_s() { return "%u"; }
-      static unsigned int format(const unsigned int val) { return val; }
-    };
-
-    template<> struct type<int> {
-      static const char* string() { static const char *const s = "int"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const int) { return false; }
-      static bool is_nan(const int) { return false; }
-      static int min() { return ~max(); }
-      static int max() { return (int)((unsigned int)-1>>1); }
-      static int inf() { return max(); }
-      static int cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(int)val; }
-      static const char* format() { return "%d"; }
-      static const char* format_s() { return "%d"; }
-      static int format(const int val) { return val; }
-    };
-
-    template<> struct type<cimg_uint64> {
-      static const char* string() { static const char *const s = "unsigned int64"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const cimg_uint64) { return false; }
-      static bool is_nan(const cimg_uint64) { return false; }
-      static cimg_uint64 min() { return 0; }
-      static cimg_uint64 max() { return (cimg_uint64)-1; }
-      static cimg_uint64 inf() { return max(); }
-      static cimg_uint64 cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(cimg_uint64)val; }
-      static const char* format() { return cimg_fuint64; }
-      static const char* format_s() { return cimg_fuint64; }
-      static unsigned long format(const cimg_uint64 val) { return (unsigned long)val; }
-    };
-
-    template<> struct type<cimg_int64> {
-      static const char* string() { static const char *const s = "int64"; return s; }
-      static bool is_float() { return false; }
-      static bool is_inf(const cimg_int64) { return false; }
-      static bool is_nan(const cimg_int64) { return false; }
-      static cimg_int64 min() { return ~max(); }
-      static cimg_int64 max() { return (cimg_int64)((cimg_uint64)-1>>1); }
-      static cimg_int64 inf() { return max(); }
-      static cimg_int64 cut(const double val) {
-        return val<(double)min()?min():val>(double)max()?max():(cimg_int64)val;
-      }
-      static const char* format() { return cimg_fint64; }
-      static const char* format_s() { return cimg_fint64; }
-      static long format(const long val) { return (long)val; }
-    };
-
-    template<> struct type<double> {
-      static const char* string() { static const char *const s = "double"; return s; }
-      static bool is_float() { return true; }
-      static bool is_inf(const double val) {
-#ifdef isinf
-        return (bool)isinf(val);
-#else
-        return !is_nan(val) && (val<cimg::type<double>::min() || val>cimg::type<double>::max());
-#endif
-      }
-      static bool is_nan(const double val) {
-#ifdef isnan
-        return (bool)isnan(val);
-#else
-        return !(val==val);
-#endif
-      }
-      static double min() { return -DBL_MAX; }
-      static double max() { return DBL_MAX; }
-      static double inf() {
-#ifdef INFINITY
-        return (double)INFINITY;
-#else
-        return max()*max();
-#endif
-      }
-      static double nan() {
-#ifdef NAN
-        return (double)NAN;
-#else
-        const double val_nan = -std::sqrt(-1.0); return val_nan;
-#endif
-      }
-      static double cut(const double val) { return val; }
-      static const char* format() { return "%.17g"; }
-      static const char* format_s() { return "%g"; }
-      static double format(const double val) { return val; }
-    };
-
-    template<> struct type<float> {
-      static const char* string() { static const char *const s = "float"; return s; }
-      static bool is_float() { return true; }
-      static bool is_inf(const float val) {
-#ifdef isinf
-        return (bool)isinf(val);
-#else
-        return !is_nan(val) && (val<cimg::type<float>::min() || val>cimg::type<float>::max());
-#endif
-      }
-      static bool is_nan(const float val) {
-#ifdef isnan
-        return (bool)isnan(val);
-#else
-        return !(val==val);
-#endif
-      }
-      static float min() { return -FLT_MAX; }
-      static float max() { return FLT_MAX; }
-      static float inf() { return (float)cimg::type<double>::inf(); }
-      static float nan() { return (float)cimg::type<double>::nan(); }
-      static float cut(const double val) { return (float)val; }
-      static float cut(const float val) { return (float)val; }
-      static const char* format() { return "%.9g"; }
-      static const char* format_s() { return "%g"; }
-      static double format(const float val) { return (double)val; }
-    };
-
-    template<> struct type<long double> {
-      static const char* string() { static const char *const s = "long double"; return s; }
-      static bool is_float() { return true; }
-      static bool is_inf(const long double val) {
-#ifdef isinf
-        return (bool)isinf(val);
-#else
-        return !is_nan(val) && (val<cimg::type<long double>::min() || val>cimg::type<long double>::max());
-#endif
-      }
-      static bool is_nan(const long double val) {
-#ifdef isnan
-        return (bool)isnan(val);
-#else
-        return !(val==val);
-#endif
-      }
-      static long double min() { return -LDBL_MAX; }
-      static long double max() { return LDBL_MAX; }
-      static long double inf() { return max()*max(); }
-      static long double nan() { const long double val_nan = -std::sqrt(-1.0L); return val_nan; }
-      static long double cut(const long double val) { return val; }
-      static const char* format() { return "%.17g"; }
-      static const char* format_s() { return "%g"; }
-      static double format(const long double val) { return (double)val; }
-    };
-
-#ifdef cimg_use_half
-    template<> struct type<half> {
-      static const char* string() { static const char *const s = "half"; return s; }
-      static bool is_float() { return true; }
-      static bool is_inf(const long double val) {
-#ifdef isinf
-        return (bool)isinf(val);
-#else
-        return !is_nan(val) && (val<cimg::type<half>::min() || val>cimg::type<half>::max());
-#endif
-      }
-      static bool is_nan(const long double val) {
-#ifdef isnan
-        return (bool)isnan(val);
-#else
-        return !(val==val);
-#endif
-      }
-      static half min() { return (half)-65504; }
-      static half max() { return (half)65504; }
-      static half inf() { return max()*max(); }
-      static half nan() { const half val_nan = (half)-std::sqrt(-1.0); return val_nan; }
-      static half cut(const double val) { return (half)val; }
-      static const char* format() { return "%.9g"; }
-      static const char* format_s() { return "%g"; }
-      static double format(const half val) { return (double)val; }
-    };
-#endif
-
-    template<typename T, typename t> struct superset { typedef T type; };
-    template<> struct superset<bool,unsigned char> { typedef unsigned char type; };
-    template<> struct superset<bool,char> { typedef char type; };
-    template<> struct superset<bool,signed char> { typedef signed char type; };
-    template<> struct superset<bool,unsigned short> { typedef unsigned short type; };
-    template<> struct superset<bool,short> { typedef short type; };
-    template<> struct superset<bool,unsigned int> { typedef unsigned int type; };
-    template<> struct superset<bool,int> { typedef int type; };
-    template<> struct superset<bool,cimg_uint64> { typedef cimg_uint64 type; };
-    template<> struct superset<bool,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<bool,float> { typedef float type; };
-    template<> struct superset<bool,double> { typedef double type; };
-    template<> struct superset<unsigned char,char> { typedef short type; };
-    template<> struct superset<unsigned char,signed char> { typedef short type; };
-    template<> struct superset<unsigned char,unsigned short> { typedef unsigned short type; };
-    template<> struct superset<unsigned char,short> { typedef short type; };
-    template<> struct superset<unsigned char,unsigned int> { typedef unsigned int type; };
-    template<> struct superset<unsigned char,int> { typedef int type; };
-    template<> struct superset<unsigned char,cimg_uint64> { typedef cimg_uint64 type; };
-    template<> struct superset<unsigned char,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned char,float> { typedef float type; };
-    template<> struct superset<unsigned char,double> { typedef double type; };
-    template<> struct superset<signed char,unsigned char> { typedef short type; };
-    template<> struct superset<signed char,char> { typedef short type; };
-    template<> struct superset<signed char,unsigned short> { typedef int type; };
-    template<> struct superset<signed char,short> { typedef short type; };
-    template<> struct superset<signed char,unsigned int> { typedef cimg_int64 type; };
-    template<> struct superset<signed char,int> { typedef int type; };
-    template<> struct superset<signed char,cimg_uint64> { typedef cimg_int64 type; };
-    template<> struct superset<signed char,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<signed char,float> { typedef float type; };
-    template<> struct superset<signed char,double> { typedef double type; };
-    template<> struct superset<char,unsigned char> { typedef short type; };
-    template<> struct superset<char,signed char> { typedef short type; };
-    template<> struct superset<char,unsigned short> { typedef int type; };
-    template<> struct superset<char,short> { typedef short type; };
-    template<> struct superset<char,unsigned int> { typedef cimg_int64 type; };
-    template<> struct superset<char,int> { typedef int type; };
-    template<> struct superset<char,cimg_uint64> { typedef cimg_int64 type; };
-    template<> struct superset<char,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<char,float> { typedef float type; };
-    template<> struct superset<char,double> { typedef double type; };
-    template<> struct superset<unsigned short,char> { typedef int type; };
-    template<> struct superset<unsigned short,signed char> { typedef int type; };
-    template<> struct superset<unsigned short,short> { typedef int type; };
-    template<> struct superset<unsigned short,unsigned int> { typedef unsigned int type; };
-    template<> struct superset<unsigned short,int> { typedef int type; };
-    template<> struct superset<unsigned short,cimg_uint64> { typedef cimg_uint64 type; };
-    template<> struct superset<unsigned short,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned short,float> { typedef float type; };
-    template<> struct superset<unsigned short,double> { typedef double type; };
-    template<> struct superset<short,unsigned short> { typedef int type; };
-    template<> struct superset<short,unsigned int> { typedef cimg_int64 type; };
-    template<> struct superset<short,int> { typedef int type; };
-    template<> struct superset<short,cimg_uint64> { typedef cimg_int64 type; };
-    template<> struct superset<short,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<short,float> { typedef float type; };
-    template<> struct superset<short,double> { typedef double type; };
-    template<> struct superset<unsigned int,char> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned int,signed char> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned int,short> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned int,int> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned int,cimg_uint64> { typedef cimg_uint64 type; };
-    template<> struct superset<unsigned int,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<unsigned int,float> { typedef float type; };
-    template<> struct superset<unsigned int,double> { typedef double type; };
-    template<> struct superset<int,unsigned int> { typedef cimg_int64 type; };
-    template<> struct superset<int,cimg_uint64> { typedef cimg_int64 type; };
-    template<> struct superset<int,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<int,float> { typedef float type; };
-    template<> struct superset<int,double> { typedef double type; };
-    template<> struct superset<cimg_uint64,char> { typedef cimg_int64 type; };
-    template<> struct superset<cimg_uint64,signed char> { typedef cimg_int64 type; };
-    template<> struct superset<cimg_uint64,short> { typedef cimg_int64 type; };
-    template<> struct superset<cimg_uint64,int> { typedef cimg_int64 type; };
-    template<> struct superset<cimg_uint64,cimg_int64> { typedef cimg_int64 type; };
-    template<> struct superset<cimg_uint64,float> { typedef double type; };
-    template<> struct superset<cimg_uint64,double> { typedef double type; };
-    template<> struct superset<cimg_int64,float> { typedef double type; };
-    template<> struct superset<cimg_int64,double> { typedef double type; };
-    template<> struct superset<float,double> { typedef double type; };
-#ifdef cimg_use_half
-    template<> struct superset<half,unsigned short> { typedef float type; };
-    template<> struct superset<half,short> { typedef float type; };
-    template<> struct superset<half,unsigned int> { typedef float type; };
-    template<> struct superset<half,int> { typedef float type; };
-    template<> struct superset<half,cimg_uint64> { typedef float type; };
-    template<> struct superset<half,cimg_int64> { typedef float type; };
-    template<> struct superset<half,float> { typedef float type; };
-    template<> struct superset<half,double> { typedef double type; };
-#endif
-
-    template<typename t1, typename t2, typename t3> struct superset2 {
-      typedef typename superset<t1, typename superset<t2,t3>::type>::type type;
-    };
-
-    template<typename t1, typename t2, typename t3, typename t4> struct superset3 {
-      typedef typename superset<t1, typename superset2<t2,t3,t4>::type>::type type;
-    };
-
-    template<typename t1, typename t2> struct last { typedef t2 type; };
-
-#define _cimg_Tt typename cimg::superset<T,t>::type
-#define _cimg_Tfloat typename cimg::superset<T,float>::type
-#define _cimg_Ttfloat typename cimg::superset2<T,t,float>::type
-#define _cimg_Ttdouble typename cimg::superset2<T,t,double>::type
-
-    // Define variables used internally by CImg.
-#if cimg_display==1
-    struct X11_info {
-      unsigned int nb_wins;
-      pthread_t *events_thread;
-      pthread_cond_t wait_event;
-      pthread_mutex_t wait_event_mutex;
-      CImgDisplay **wins;
-      Display *display;
-      unsigned int nb_bits;
-      bool is_blue_first;
-      bool is_shm_enabled;
-      bool byte_order;
-#ifdef cimg_use_xrandr
-      XRRScreenSize *resolutions;
-      Rotation curr_rotation;
-      unsigned int curr_resolution;
-      unsigned int nb_resolutions;
-#endif
-      X11_info():nb_wins(0),events_thread(0),display(0),
-                 nb_bits(0),is_blue_first(false),is_shm_enabled(false),byte_order(false) {
-#ifdef __FreeBSD__
-        XInitThreads();
-#endif
-        wins = new CImgDisplay*[1024];
-        pthread_mutex_init(&wait_event_mutex,0);
-        pthread_cond_init(&wait_event,0);
-#ifdef cimg_use_xrandr
-        resolutions = 0;
-        curr_rotation = 0;
-        curr_resolution = nb_resolutions = 0;
-#endif
-      }
-
-      ~X11_info() {
-        delete[] wins;
-        /*
-          if (events_thread) {
-          pthread_cancel(*events_thread);
-          delete events_thread;
-          }
-          if (display) { } // XCloseDisplay(display); }
-          pthread_cond_destroy(&wait_event);
-          pthread_mutex_unlock(&wait_event_mutex);
-          pthread_mutex_destroy(&wait_event_mutex);
-        */
-      }
-    };
-#if defined(cimg_module)
-    X11_info& X11_attr();
-#elif defined(cimg_main)
-    X11_info& X11_attr() { static X11_info val; return val; }
-#else
-    inline X11_info& X11_attr() { static X11_info val; return val; }
-#endif
-#define cimg_lock_display() cimg::mutex(15)
-#define cimg_unlock_display() cimg::mutex(15,0)
-
-#elif cimg_display==2
-    struct Win32_info {
-      HANDLE wait_event;
-      Win32_info() { wait_event = CreateEvent(0,FALSE,FALSE,0); }
-    };
-#if defined(cimg_module)
-    Win32_info& Win32_attr();
-#elif defined(cimg_main)
-    Win32_info& Win32_attr() { static Win32_info val; return val; }
-#else
-    inline Win32_info& Win32_attr() { static Win32_info val; return val; }
-#endif
-#endif
-
-    struct Mutex_info {
-#if cimg_OS==2
-      HANDLE mutex[32];
-      Mutex_info() { for (unsigned int i = 0; i<32; ++i) mutex[i] = CreateMutex(0,FALSE,0); }
-      void lock(const unsigned int n) { WaitForSingleObject(mutex[n],INFINITE); }
-      void unlock(const unsigned int n) { ReleaseMutex(mutex[n]); }
-      int trylock(const unsigned int) { return 0; }
-#elif defined(_PTHREAD_H)
-      pthread_mutex_t mutex[32];
-      Mutex_info() { for (unsigned int i = 0; i<32; ++i) pthread_mutex_init(&mutex[i],0); }
-      void lock(const unsigned int n) { pthread_mutex_lock(&mutex[n]); }
-      void unlock(const unsigned int n) { pthread_mutex_unlock(&mutex[n]); }
-      int trylock(const unsigned int n) { return pthread_mutex_trylock(&mutex[n]); }
-#else
-      Mutex_info() {}
-      void lock(const unsigned int) {}
-      void unlock(const unsigned int) {}
-      int trylock(const unsigned int) { return 0; }
-#endif
-    };
-#if defined(cimg_module)
-    Mutex_info& Mutex_attr();
-#elif defined(cimg_main)
-    Mutex_info& Mutex_attr() { static Mutex_info val; return val; }
-#else
-    inline Mutex_info& Mutex_attr() { static Mutex_info val; return val; }
-#endif
-
-#if defined(cimg_use_magick)
-    static struct Magick_info {
-      Magick_info() {
-        Magick::InitializeMagick("");
-      }
-    } _Magick_info;
-#endif
-
-#if cimg_display==1
-    // Define keycodes for X11-based graphical systems.
-    const unsigned int keyESC        = XK_Escape;
-    const unsigned int keyF1         = XK_F1;
-    const unsigned int keyF2         = XK_F2;
-    const unsigned int keyF3         = XK_F3;
-    const unsigned int keyF4         = XK_F4;
-    const unsigned int keyF5         = XK_F5;
-    const unsigned int keyF6         = XK_F6;
-    const unsigned int keyF7         = XK_F7;
-    const unsigned int keyF8         = XK_F8;
-    const unsigned int keyF9         = XK_F9;
-    const unsigned int keyF10        = XK_F10;
-    const unsigned int keyF11        = XK_F11;
-    const unsigned int keyF12        = XK_F12;
-    const unsigned int keyPAUSE      = XK_Pause;
-    const unsigned int key1          = XK_1;
-    const unsigned int key2          = XK_2;
-    const unsigned int key3          = XK_3;
-    const unsigned int key4          = XK_4;
-    const unsigned int key5          = XK_5;
-    const unsigned int key6          = XK_6;
-    const unsigned int key7          = XK_7;
-    const unsigned int key8          = XK_8;
-    const unsigned int key9          = XK_9;
-    const unsigned int key0          = XK_0;
-    const unsigned int keyBACKSPACE  = XK_BackSpace;
-    const unsigned int keyINSERT     = XK_Insert;
-    const unsigned int keyHOME       = XK_Home;
-    const unsigned int keyPAGEUP     = XK_Page_Up;
-    const unsigned int keyTAB        = XK_Tab;
-    const unsigned int keyQ          = XK_q;
-    const unsigned int keyW          = XK_w;
-    const unsigned int keyE          = XK_e;
-    const unsigned int keyR          = XK_r;
-    const unsigned int keyT          = XK_t;
-    const unsigned int keyY          = XK_y;
-    const unsigned int keyU          = XK_u;
-    const unsigned int keyI          = XK_i;
-    const unsigned int keyO          = XK_o;
-    const unsigned int keyP          = XK_p;
-    const unsigned int keyDELETE     = XK_Delete;
-    const unsigned int keyEND        = XK_End;
-    const unsigned int keyPAGEDOWN   = XK_Page_Down;
-    const unsigned int keyCAPSLOCK   = XK_Caps_Lock;
-    const unsigned int keyA          = XK_a;
-    const unsigned int keyS          = XK_s;
-    const unsigned int keyD          = XK_d;
-    const unsigned int keyF          = XK_f;
-    const unsigned int keyG          = XK_g;
-    const unsigned int keyH          = XK_h;
-    const unsigned int keyJ          = XK_j;
-    const unsigned int keyK          = XK_k;
-    const unsigned int keyL          = XK_l;
-    const unsigned int keyENTER      = XK_Return;
-    const unsigned int keySHIFTLEFT  = XK_Shift_L;
-    const unsigned int keyZ          = XK_z;
-    const unsigned int keyX          = XK_x;
-    const unsigned int keyC          = XK_c;
-    const unsigned int keyV          = XK_v;
-    const unsigned int keyB          = XK_b;
-    const unsigned int keyN          = XK_n;
-    const unsigned int keyM          = XK_m;
-    const unsigned int keySHIFTRIGHT = XK_Shift_R;
-    const unsigned int keyARROWUP    = XK_Up;
-    const unsigned int keyCTRLLEFT   = XK_Control_L;
-    const unsigned int keyAPPLEFT    = XK_Super_L;
-    const unsigned int keyALT        = XK_Alt_L;
-    const unsigned int keySPACE      = XK_space;
-    const unsigned int keyALTGR      = XK_Alt_R;
-    const unsigned int keyAPPRIGHT   = XK_Super_R;
-    const unsigned int keyMENU       = XK_Menu;
-    const unsigned int keyCTRLRIGHT  = XK_Control_R;
-    const unsigned int keyARROWLEFT  = XK_Left;
-    const unsigned int keyARROWDOWN  = XK_Down;
-    const unsigned int keyARROWRIGHT = XK_Right;
-    const unsigned int keyPAD0       = XK_KP_0;
-    const unsigned int keyPAD1       = XK_KP_1;
-    const unsigned int keyPAD2       = XK_KP_2;
-    const unsigned int keyPAD3       = XK_KP_3;
-    const unsigned int keyPAD4       = XK_KP_4;
-    const unsigned int keyPAD5       = XK_KP_5;
-    const unsigned int keyPAD6       = XK_KP_6;
-    const unsigned int keyPAD7       = XK_KP_7;
-    const unsigned int keyPAD8       = XK_KP_8;
-    const unsigned int keyPAD9       = XK_KP_9;
-    const unsigned int keyPADADD     = XK_KP_Add;
-    const unsigned int keyPADSUB     = XK_KP_Subtract;
-    const unsigned int keyPADMUL     = XK_KP_Multiply;
-    const unsigned int keyPADDIV     = XK_KP_Divide;
-
-#elif cimg_display==2
-    // Define keycodes for Windows.
-    const unsigned int keyESC        = VK_ESCAPE;
-    const unsigned int keyF1         = VK_F1;
-    const unsigned int keyF2         = VK_F2;
-    const unsigned int keyF3         = VK_F3;
-    const unsigned int keyF4         = VK_F4;
-    const unsigned int keyF5         = VK_F5;
-    const unsigned int keyF6         = VK_F6;
-    const unsigned int keyF7         = VK_F7;
-    const unsigned int keyF8         = VK_F8;
-    const unsigned int keyF9         = VK_F9;
-    const unsigned int keyF10        = VK_F10;
-    const unsigned int keyF11        = VK_F11;
-    const unsigned int keyF12        = VK_F12;
-    const unsigned int keyPAUSE      = VK_PAUSE;
-    const unsigned int key1          = '1';
-    const unsigned int key2          = '2';
-    const unsigned int key3          = '3';
-    const unsigned int key4          = '4';
-    const unsigned int key5          = '5';
-    const unsigned int key6          = '6';
-    const unsigned int key7          = '7';
-    const unsigned int key8          = '8';
-    const unsigned int key9          = '9';
-    const unsigned int key0          = '0';
-    const unsigned int keyBACKSPACE  = VK_BACK;
-    const unsigned int keyINSERT     = VK_INSERT;
-    const unsigned int keyHOME       = VK_HOME;
-    const unsigned int keyPAGEUP     = VK_PRIOR;
-    const unsigned int keyTAB        = VK_TAB;
-    const unsigned int keyQ          = 'Q';
-    const unsigned int keyW          = 'W';
-    const unsigned int keyE          = 'E';
-    const unsigned int keyR          = 'R';
-    const unsigned int keyT          = 'T';
-    const unsigned int keyY          = 'Y';
-    const unsigned int keyU          = 'U';
-    const unsigned int keyI          = 'I';
-    const unsigned int keyO          = 'O';
-    const unsigned int keyP          = 'P';
-    const unsigned int keyDELETE     = VK_DELETE;
-    const unsigned int keyEND        = VK_END;
-    const unsigned int keyPAGEDOWN   = VK_NEXT;
-    const unsigned int keyCAPSLOCK   = VK_CAPITAL;
-    const unsigned int keyA          = 'A';
-    const unsigned int keyS          = 'S';
-    const unsigned int keyD          = 'D';
-    const unsigned int keyF          = 'F';
-    const unsigned int keyG          = 'G';
-    const unsigned int keyH          = 'H';
-    const unsigned int keyJ          = 'J';
-    const unsigned int keyK          = 'K';
-    const unsigned int keyL          = 'L';
-    const unsigned int keyENTER      = VK_RETURN;
-    const unsigned int keySHIFTLEFT  = VK_SHIFT;
-    const unsigned int keyZ          = 'Z';
-    const unsigned int keyX          = 'X';
-    const unsigned int keyC          = 'C';
-    const unsigned int keyV          = 'V';
-    const unsigned int keyB          = 'B';
-    const unsigned int keyN          = 'N';
-    const unsigned int keyM          = 'M';
-    const unsigned int keySHIFTRIGHT = VK_SHIFT;
-    const unsigned int keyARROWUP    = VK_UP;
-    const unsigned int keyCTRLLEFT   = VK_CONTROL;
-    const unsigned int keyAPPLEFT    = VK_LWIN;
-    const unsigned int keyALT        = VK_LMENU;
-    const unsigned int keySPACE      = VK_SPACE;
-    const unsigned int keyALTGR      = VK_CONTROL;
-    const unsigned int keyAPPRIGHT   = VK_RWIN;
-    const unsigned int keyMENU       = VK_APPS;
-    const unsigned int keyCTRLRIGHT  = VK_CONTROL;
-    const unsigned int keyARROWLEFT  = VK_LEFT;
-    const unsigned int keyARROWDOWN  = VK_DOWN;
-    const unsigned int keyARROWRIGHT = VK_RIGHT;
-    const unsigned int keyPAD0       = 0x60;
-    const unsigned int keyPAD1       = 0x61;
-    const unsigned int keyPAD2       = 0x62;
-    const unsigned int keyPAD3       = 0x63;
-    const unsigned int keyPAD4       = 0x64;
-    const unsigned int keyPAD5       = 0x65;
-    const unsigned int keyPAD6       = 0x66;
-    const unsigned int keyPAD7       = 0x67;
-    const unsigned int keyPAD8       = 0x68;
-    const unsigned int keyPAD9       = 0x69;
-    const unsigned int keyPADADD     = VK_ADD;
-    const unsigned int keyPADSUB     = VK_SUBTRACT;
-    const unsigned int keyPADMUL     = VK_MULTIPLY;
-    const unsigned int keyPADDIV     = VK_DIVIDE;
-
-#else
-    // Define random keycodes when no display is available.
-    // (should rarely be used then!).
-    const unsigned int keyESC        = 1U;   //!< Keycode for the \c ESC key (architecture-dependent).
-    const unsigned int keyF1         = 2U;   //!< Keycode for the \c F1 key (architecture-dependent).
-    const unsigned int keyF2         = 3U;   //!< Keycode for the \c F2 key (architecture-dependent).
-    const unsigned int keyF3         = 4U;   //!< Keycode for the \c F3 key (architecture-dependent).
-    const unsigned int keyF4         = 5U;   //!< Keycode for the \c F4 key (architecture-dependent).
-    const unsigned int keyF5         = 6U;   //!< Keycode for the \c F5 key (architecture-dependent).
-    const unsigned int keyF6         = 7U;   //!< Keycode for the \c F6 key (architecture-dependent).
-    const unsigned int keyF7         = 8U;   //!< Keycode for the \c F7 key (architecture-dependent).
-    const unsigned int keyF8         = 9U;   //!< Keycode for the \c F8 key (architecture-dependent).
-    const unsigned int keyF9         = 10U;  //!< Keycode for the \c F9 key (architecture-dependent).
-    const unsigned int keyF10        = 11U;  //!< Keycode for the \c F10 key (architecture-dependent).
-    const unsigned int keyF11        = 12U;  //!< Keycode for the \c F11 key (architecture-dependent).
-    const unsigned int keyF12        = 13U;  //!< Keycode for the \c F12 key (architecture-dependent).
-    const unsigned int keyPAUSE      = 14U;  //!< Keycode for the \c PAUSE key (architecture-dependent).
-    const unsigned int key1          = 15U;  //!< Keycode for the \c 1 key (architecture-dependent).
-    const unsigned int key2          = 16U;  //!< Keycode for the \c 2 key (architecture-dependent).
-    const unsigned int key3          = 17U;  //!< Keycode for the \c 3 key (architecture-dependent).
-    const unsigned int key4          = 18U;  //!< Keycode for the \c 4 key (architecture-dependent).
-    const unsigned int key5          = 19U;  //!< Keycode for the \c 5 key (architecture-dependent).
-    const unsigned int key6          = 20U;  //!< Keycode for the \c 6 key (architecture-dependent).
-    const unsigned int key7          = 21U;  //!< Keycode for the \c 7 key (architecture-dependent).
-    const unsigned int key8          = 22U;  //!< Keycode for the \c 8 key (architecture-dependent).
-    const unsigned int key9          = 23U;  //!< Keycode for the \c 9 key (architecture-dependent).
-    const unsigned int key0          = 24U;  //!< Keycode for the \c 0 key (architecture-dependent).
-    const unsigned int keyBACKSPACE  = 25U;  //!< Keycode for the \c BACKSPACE key (architecture-dependent).
-    const unsigned int keyINSERT     = 26U;  //!< Keycode for the \c INSERT key (architecture-dependent).
-    const unsigned int keyHOME       = 27U;  //!< Keycode for the \c HOME key (architecture-dependent).
-    const unsigned int keyPAGEUP     = 28U;  //!< Keycode for the \c PAGEUP key (architecture-dependent).
-    const unsigned int keyTAB        = 29U;  //!< Keycode for the \c TAB key (architecture-dependent).
-    const unsigned int keyQ          = 30U;  //!< Keycode for the \c Q key (architecture-dependent).
-    const unsigned int keyW          = 31U;  //!< Keycode for the \c W key (architecture-dependent).
-    const unsigned int keyE          = 32U;  //!< Keycode for the \c E key (architecture-dependent).
-    const unsigned int keyR          = 33U;  //!< Keycode for the \c R key (architecture-dependent).
-    const unsigned int keyT          = 34U;  //!< Keycode for the \c T key (architecture-dependent).
-    const unsigned int keyY          = 35U;  //!< Keycode for the \c Y key (architecture-dependent).
-    const unsigned int keyU          = 36U;  //!< Keycode for the \c U key (architecture-dependent).
-    const unsigned int keyI          = 37U;  //!< Keycode for the \c I key (architecture-dependent).
-    const unsigned int keyO          = 38U;  //!< Keycode for the \c O key (architecture-dependent).
-    const unsigned int keyP          = 39U;  //!< Keycode for the \c P key (architecture-dependent).
-    const unsigned int keyDELETE     = 40U;  //!< Keycode for the \c DELETE key (architecture-dependent).
-    const unsigned int keyEND        = 41U;  //!< Keycode for the \c END key (architecture-dependent).
-    const unsigned int keyPAGEDOWN   = 42U;  //!< Keycode for the \c PAGEDOWN key (architecture-dependent).
-    const unsigned int keyCAPSLOCK   = 43U;  //!< Keycode for the \c CAPSLOCK key (architecture-dependent).
-    const unsigned int keyA          = 44U;  //!< Keycode for the \c A key (architecture-dependent).
-    const unsigned int keyS          = 45U;  //!< Keycode for the \c S key (architecture-dependent).
-    const unsigned int keyD          = 46U;  //!< Keycode for the \c D key (architecture-dependent).
-    const unsigned int keyF          = 47U;  //!< Keycode for the \c F key (architecture-dependent).
-    const unsigned int keyG          = 48U;  //!< Keycode for the \c G key (architecture-dependent).
-    const unsigned int keyH          = 49U;  //!< Keycode for the \c H key (architecture-dependent).
-    const unsigned int keyJ          = 50U;  //!< Keycode for the \c J key (architecture-dependent).
-    const unsigned int keyK          = 51U;  //!< Keycode for the \c K key (architecture-dependent).
-    const unsigned int keyL          = 52U;  //!< Keycode for the \c L key (architecture-dependent).
-    const unsigned int keyENTER      = 53U;  //!< Keycode for the \c ENTER key (architecture-dependent).
-    const unsigned int keySHIFTLEFT  = 54U;  //!< Keycode for the \c SHIFTLEFT key (architecture-dependent).
-    const unsigned int keyZ          = 55U;  //!< Keycode for the \c Z key (architecture-dependent).
-    const unsigned int keyX          = 56U;  //!< Keycode for the \c X key (architecture-dependent).
-    const unsigned int keyC          = 57U;  //!< Keycode for the \c C key (architecture-dependent).
-    const unsigned int keyV          = 58U;  //!< Keycode for the \c V key (architecture-dependent).
-    const unsigned int keyB          = 59U;  //!< Keycode for the \c B key (architecture-dependent).
-    const unsigned int keyN          = 60U;  //!< Keycode for the \c N key (architecture-dependent).
-    const unsigned int keyM          = 61U;  //!< Keycode for the \c M key (architecture-dependent).
-    const unsigned int keySHIFTRIGHT = 62U;  //!< Keycode for the \c SHIFTRIGHT key (architecture-dependent).
-    const unsigned int keyARROWUP    = 63U;  //!< Keycode for the \c ARROWUP key (architecture-dependent).
-    const unsigned int keyCTRLLEFT   = 64U;  //!< Keycode for the \c CTRLLEFT key (architecture-dependent).
-    const unsigned int keyAPPLEFT    = 65U;  //!< Keycode for the \c APPLEFT key (architecture-dependent).
-    const unsigned int keyALT        = 66U;  //!< Keycode for the \c ALT key (architecture-dependent).
-    const unsigned int keySPACE      = 67U;  //!< Keycode for the \c SPACE key (architecture-dependent).
-    const unsigned int keyALTGR      = 68U;  //!< Keycode for the \c ALTGR key (architecture-dependent).
-    const unsigned int keyAPPRIGHT   = 69U;  //!< Keycode for the \c APPRIGHT key (architecture-dependent).
-    const unsigned int keyMENU       = 70U;  //!< Keycode for the \c MENU key (architecture-dependent).
-    const unsigned int keyCTRLRIGHT  = 71U;  //!< Keycode for the \c CTRLRIGHT key (architecture-dependent).
-    const unsigned int keyARROWLEFT  = 72U;  //!< Keycode for the \c ARROWLEFT key (architecture-dependent).
-    const unsigned int keyARROWDOWN  = 73U;  //!< Keycode for the \c ARROWDOWN key (architecture-dependent).
-    const unsigned int keyARROWRIGHT = 74U;  //!< Keycode for the \c ARROWRIGHT key (architecture-dependent).
-    const unsigned int keyPAD0       = 75U;  //!< Keycode for the \c PAD0 key (architecture-dependent).
-    const unsigned int keyPAD1       = 76U;  //!< Keycode for the \c PAD1 key (architecture-dependent).
-    const unsigned int keyPAD2       = 77U;  //!< Keycode for the \c PAD2 key (architecture-dependent).
-    const unsigned int keyPAD3       = 78U;  //!< Keycode for the \c PAD3 key (architecture-dependent).
-    const unsigned int keyPAD4       = 79U;  //!< Keycode for the \c PAD4 key (architecture-dependent).
-    const unsigned int keyPAD5       = 80U;  //!< Keycode for the \c PAD5 key (architecture-dependent).
-    const unsigned int keyPAD6       = 81U;  //!< Keycode for the \c PAD6 key (architecture-dependent).
-    const unsigned int keyPAD7       = 82U;  //!< Keycode for the \c PAD7 key (architecture-dependent).
-    const unsigned int keyPAD8       = 83U;  //!< Keycode for the \c PAD8 key (architecture-dependent).
-    const unsigned int keyPAD9       = 84U;  //!< Keycode for the \c PAD9 key (architecture-dependent).
-    const unsigned int keyPADADD     = 85U;  //!< Keycode for the \c PADADD key (architecture-dependent).
-    const unsigned int keyPADSUB     = 86U;  //!< Keycode for the \c PADSUB key (architecture-dependent).
-    const unsigned int keyPADMUL     = 87U;  //!< Keycode for the \c PADMUL key (architecture-dependent).
-    const unsigned int keyPADDIV     = 88U;  //!< Keycode for the \c PADDDIV key (architecture-dependent).
-#endif
-
-    const double PI = 3.14159265358979323846;   //!< Value of the mathematical constant PI
-
-    // Define a 12x13 font (small size).
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-    // Define a 47x53 font (extra-large size).
-    static const char *const data_font47x53 =
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-      "  Fb                          Pb                 'b2]       E`                            "
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-      "     Oa                 &a1]       D^                                                     "
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-      "                      T]  @`            D`                          N`                 %_/"
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-      "8]                             H";
-
-    // Define a 90x103 font (huge size).
-    static const char *const _data_font90x103[] = {
-      // Defined as an array to avoid MS compiler limit about constant string (65Kb).
-      // First string:
-      "                                                                                          "
-      "                                                                                          "
-      "                                                                                          "
-      "                                                                                          "
-      "            HX     4V         >X       IX           *W             FW                     "
-      "                                                                                          "
-      "                                                                                          "
-      "                                                                                          "
-      "                                                                                          "
-      "                                                         HX  W 4Z 3VCT   <Z     >X  W 4Z  "
-      " HX  W 4Z     'VCT ;X  W 3Y 2UCT       KX  W 3Y   0W                                      "
-      "                                                                                          "
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-      "                                                                                          "
-      "                                                                                          "
-      "                                    @W !W 4\\ 5YET ?XHX 8]     >W !W 4\\ 7XGX KW !W 4\\ 7XHX "
-      "  +YET :W !W 3[ 5ZFT ?XGX     EW !W 3[ 7XGX 5W                                            "
-      "                                                                                          "
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-      "                              >W \"V 3\\ 7]HU ?XHX 9`     ?W \"V 3\\ 7XGX JW \"V 3\\ 7XHX   -]HU"
-      " 9W \"V 3] 7]HT ?XGX     DW \"V 3] 8XGX 5V                                                  "
-      "                                                                                          "
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-      "                        <W $V 3VNV 8_KV ?XHX 9`     >W $V 3VNV 8XGX IW $V 3VNV 8XHX   -_KV"
-      " 8W $V 2] 7_KU ?XGX     CW $V 2] 8XGX 6V                                                  "
-      "                                                                                          "
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-      "                        :W &W 4VLV :j >XHX :VJV     >W &W 4VLV 9XGX HW &W 4VLV 9XHX   .j 6"
-      "W &W 3VMV 9i >XGX     BW &W 3VMV 9XGX 7W               MW                                 "
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-      " 5V 'W 3VKV :i >XGX     AV 'W 3VKV :XGX 8W               N[                               "
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-      "IV                                                                          \"W            "
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-      "                                                              JU /V 3VBV     ETBT     :U /"
-      "V 3VBV   FU /V 3VBV       (U /V 2UAU         DU /V 2UAU   @V               NVGV           "
-      "                                                               $X                         "
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-      "                                            *X                                            "
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-      "                           JX                                GTBT                         "
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-      "     GX  GX 5V   (X                            &X                                         "
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-      "                            )X                                                     8V     "
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-      "            ;X                                FTBT                                        "
-      "           LX  IX 7X     <UCU     DX  IX 7X   JX  IX 6W       3X  IX 6X         GX  IX 5X "
-      "  *X                            &Y                                                        "
-      "                                                                                          "
-      "             (X                                                     9V                    "
-      "                                                                                       <X "
-      "                               ETBT                                                   KX  "
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-      "   4Z           NX                 @X                                                     "
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-      "  KW  KW 4Z   ,W BW                 8V         (S                                         "
-      "    <S       9V 7V                                                                        "
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-      "            8XGX                      +W                                BTEU              "
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-      "     NT                                         +X 8W !X              (VIV                "
-      "                                       6S       :V 5V     5U     9W                      \""
-      "U         +\\;]                 )X              MZ                  Ia (W :a               "
-      "    =Y    %W           ?W  :W              /W   )[ ?V #[         KW        FW ?W   >W    N"
-      "W   0W =W                                      3S       GV 'Z                          ;W "
-      " HUGU   >U                            &U                                                  "
-      "           U                                         ,W 7W !W              'VIV           "
-      "                                            6S       :V 6W     6V                         "
-      "   4V         *_C`                 )Y              LZ                  Ja   :a            "
-      "      (P7Y    $W           ?W  :W              0X   (b GV +b         JW        FW ?W   >W "
-      "   NW   0W =W                                      3S       GV                            "
-      "7W  HUGU   >U                            &U                                               "
-      "              U                                         -X 7W \"X              'VJW        "
-      "                                               6S       9V 7V     5U                      "
-      "      3U         'x                 (Z              KZ                  Ka   :a           "
-      "       (R:Z    $W           ?W  :W              0X   (b GV +b         JW        FW ?W   >W"
-      "    NW   0W =W                                      3S       GV                           "
-      " 7W     #U                            &U                                                  "
-      "           U                                         -X 7W \"X              &UJW           "
-      "                                            6S       9W 9W                                "
-      "            Bu                 ([              IZ                  La   :a                "
-      "  (T>[    $X           ?W  :W              1X   &a GV +a         IW        FW ?W   >W    N"
-      "W   0W =W                                      3S       GV                            7W  "
-      "   $V                            'V                                                       "
-      "     !V                                         .X 6W #X              %VLW                "
-      "                                       5S                                                 "
-      "    2p                 -a                                                       8XE]    %Y"
-      "           >W  :W              3Z   $_ GV +_         GW        FW ?W   >W    NW   0W =W   "
-      "                                   3S       GV                            7W     /QGW     "
-      "                       2QGW                                                            ,QG"
-      "W                                         0Z 6W %Z              %a                        "
-      "                               5S                                                     0l  "
-      "               +a                                                       8p    +_          "
-      " >W  :W              ;a   !] GV +]         EW        FW ?W   >W    NW   0W =W             "
-      "                         3S       GV                            7W     /`                 "
-      "           1`                                                            +`               "
-      "                          7a 5W -a              #`                                        "
-      "                                                                     >e                 '`"
-      "                                                       7o    *^           =W  :W          "
-      "    ;`    KY GV +Y         AW        FW ?W   >W    NW   0W =W                             "
-      "         3S       GV                            7W     /`                            1`   "
-      "                                                         +`                               "
-      "          7` 4W -`              \"_                                                        "
-      "                                                     8\\                 #_                "
-      "                       \"}              3n    )^           =W  :W              ;`     9V   "
-      "        BW        FW ?W   >W    NW   0W =W                                             'V "
-      "                           7W     /_                            0_                        "
-      "                                    *_                                         6` 4W -`   "
-      "           !]                                                                             "
-      "                                                  -]                                      "
-      "  }              3l    ']           <W  :W              ;_     8V           BW        FW ?"
-      "W   >W    NW   0W =W                                             'V                       "
-      "     7W     /^                            /^                                              "
-      "              )^                                         5_ 3W -_               N[        "
-      "                                                                                          "
-      "                             ,[                                        M}              2j "
-      "   &\\           ;W  :W              ;^     7V           BW        FW ?W   >W    NW   0W =W"
-      "                                                                          7W     -Y       "
-      "                     *Y                                                            $Y     "
-      "                                    2^ 2W -^               LX                             "
-      "                                                                                          "
-      "        *X                                        J}              /d    #Z           9W  :"
-      "W              ;\\     5V           BW        FW ?W   >W    NW   0W =W                     "
-      "                                                     7W                                   "
-      "                                                                                          "
-      "            /\\ 0W                 HT                                                      "
-      "                                                                                          "
-      "                        I}              *[     NW           6W  :W              ;Z     3V "
-      "          BW        FW ?W   >W    NW   0W =W                                              "
-      "                            7W                                                            "
-      "                                                                             /Z .W        "
-      "                                                                                          "
-      "                                                                                       =} "
-      "                                                                                          "
-      "                                                                                          "
-      "                                                                                          "
-      "                                    D" };
-
-    // Define a 40x38 'danger' color logo (used by cimg::dialog()).
-    static const unsigned char logo40x38[4576] = {
-      177,200,200,200,3,123,123,0,36,200,200,200,1,123,123,0,2,255,255,0,1,189,189,189,1,0,0,0,34,200,200,200,
-      1,123,123,0,4,255,255,0,1,189,189,189,1,0,0,0,1,123,123,123,32,200,200,200,1,123,123,0,5,255,255,0,1,0,0,
-      0,2,123,123,123,30,200,200,200,1,123,123,0,6,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,29,200,200,200,
-      1,123,123,0,7,255,255,0,1,0,0,0,2,123,123,123,28,200,200,200,1,123,123,0,8,255,255,0,1,189,189,189,1,0,0,0,
-      2,123,123,123,27,200,200,200,1,123,123,0,9,255,255,0,1,0,0,0,2,123,123,123,26,200,200,200,1,123,123,0,10,255,
-      255,0,1,189,189,189,1,0,0,0,2,123,123,123,25,200,200,200,1,123,123,0,3,255,255,0,1,189,189,189,3,0,0,0,1,189,
-      189,189,3,255,255,0,1,0,0,0,2,123,123,123,24,200,200,200,1,123,123,0,4,255,255,0,5,0,0,0,3,255,255,0,1,189,
-      189,189,1,0,0,0,2,123,123,123,23,200,200,200,1,123,123,0,4,255,255,0,5,0,0,0,4,255,255,0,1,0,0,0,2,123,123,123,
-      22,200,200,200,1,123,123,0,5,255,255,0,5,0,0,0,4,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,21,200,200,200,
-      1,123,123,0,5,255,255,0,5,0,0,0,5,255,255,0,1,0,0,0,2,123,123,123,20,200,200,200,1,123,123,0,6,255,255,0,5,0,0,
-      0,5,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,19,200,200,200,1,123,123,0,6,255,255,0,1,123,123,0,3,0,0,0,1,
-      123,123,0,6,255,255,0,1,0,0,0,2,123,123,123,18,200,200,200,1,123,123,0,7,255,255,0,1,189,189,189,3,0,0,0,1,189,
-      189,189,6,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,17,200,200,200,1,123,123,0,8,255,255,0,3,0,0,0,8,255,255,
-      0,1,0,0,0,2,123,123,123,16,200,200,200,1,123,123,0,9,255,255,0,1,123,123,0,1,0,0,0,1,123,123,0,8,255,255,0,1,189,
-      189,189,1,0,0,0,2,123,123,123,15,200,200,200,1,123,123,0,9,255,255,0,1,189,189,189,1,0,0,0,1,189,189,189,9,255,
-      255,0,1,0,0,0,2,123,123,123,14,200,200,200,1,123,123,0,11,255,255,0,1,0,0,0,10,255,255,0,1,189,189,189,1,0,0,0,2,
-      123,123,123,13,200,200,200,1,123,123,0,23,255,255,0,1,0,0,0,2,123,123,123,12,200,200,200,1,123,123,0,11,255,255,0,
-      1,189,189,189,2,0,0,0,1,189,189,189,9,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,11,200,200,200,1,123,123,0,11,
-      255,255,0,4,0,0,0,10,255,255,0,1,0,0,0,2,123,123,123,10,200,200,200,1,123,123,0,12,255,255,0,4,0,0,0,10,255,255,0,
-      1,189,189,189,1,0,0,0,2,123,123,123,9,200,200,200,1,123,123,0,12,255,255,0,1,189,189,189,2,0,0,0,1,189,189,189,11,
-      255,255,0,1,0,0,0,2,123,123,123,9,200,200,200,1,123,123,0,27,255,255,0,1,0,0,0,3,123,123,123,8,200,200,200,1,123,
-      123,0,26,255,255,0,1,189,189,189,1,0,0,0,3,123,123,123,9,200,200,200,1,123,123,0,24,255,255,0,1,189,189,189,1,0,0,
-      0,4,123,123,123,10,200,200,200,1,123,123,0,24,0,0,0,5,123,123,123,12,200,200,200,27,123,123,123,14,200,200,200,25,
-      123,123,123,86,200,200,200,91,49,124,118,124,71,32,124,95,49,56,114,52,82,121,0 };
-
-    //! Get/set default output stream for the \CImg library messages.
-    /**
-       \param file Desired output stream. Set to \c 0 to get the currently used output stream only.
-       \return Currently used output stream.
-    **/
-    inline std::FILE* output(std::FILE *file) {
-      cimg::mutex(1);
-      static std::FILE *res = cimg::_stderr();
-      if (file) res = file;
-      cimg::mutex(1,0);
-      return res;
-    }
-
-    // Return number of available CPU cores.
-    inline unsigned int nb_cpus() {
-      unsigned int res = 1;
-#if cimg_OS==2
-      SYSTEM_INFO sysinfo;
-      GetSystemInfo(&sysinfo);
-      res = (unsigned int)sysinfo.dwNumberOfProcessors;
-#elif cimg_OS == 1
-      res = (unsigned int)sysconf(_SC_NPROCESSORS_ONLN);
-#endif
-      return res?res:1U;
-    }
-
-    // Lock/unlock mutex for CImg multi-thread programming.
-    inline int mutex(const unsigned int n, const int lock_mode) {
-      switch (lock_mode) {
-      case 0 : cimg::Mutex_attr().unlock(n); return 0;
-      case 1 : cimg::Mutex_attr().lock(n); return 0;
-      default : return cimg::Mutex_attr().trylock(n);
-      }
-    }
-
-    //! Display a warning message on the default output stream.
-    /**
-       \param format C-string containing the format of the message, as with <tt>std::printf()</tt>.
-       \note If configuration macro \c cimg_strict_warnings is set, this function throws a
-       \c CImgWarningException instead.
-       \warning As the first argument is a format string, it is highly recommended to write
-       \code
-       cimg::warn("%s",warning_message);
-       \endcode
-       instead of
-       \code
-       cimg::warn(warning_message);
-       \endcode
-       if \c warning_message can be arbitrary, to prevent nasty memory access.
-    **/
-    inline void warn(const char *const format, ...) {
-      if (cimg::exception_mode()>=1) {
-        char *const message = new char[16384];
-        std::va_list ap;
-        va_start(ap,format);
-        cimg_vsnprintf(message,16384,format,ap);
-        va_end(ap);
-#ifdef cimg_strict_warnings
-        throw CImgWarningException(message);
-#else
-        std::fprintf(cimg::output(),"\n%s[CImg] *** Warning ***%s%s\n",cimg::t_red,cimg::t_normal,message);
-#endif
-        delete[] message;
-      }
-    }
-
-    // Execute an external system command.
-    /**
-       \param command C-string containing the command line to execute.
-       \param module_name Module name.
-       \return Status value of the executed command, whose meaning is OS-dependent.
-       \note This function is similar to <tt>std::system()</tt>
-       but it does not open an extra console windows
-       on Windows-based systems.
-    **/
-    inline int system(const char *const command, const char *const module_name=0) {
-      cimg::unused(module_name);
-#ifdef cimg_no_system_calls
-      return -1;
-#else
-#if cimg_OS==1
-      const unsigned int l = (unsigned int)std::strlen(command);
-      if (l) {
-        char *const ncommand = new char[l + 16];
-        std::strncpy(ncommand,command,l);
-        std::strcpy(ncommand + l," 2> /dev/null"); // Make command silent.
-        const int out_val = std::system(ncommand);
-        delete[] ncommand;
-        return out_val;
-      } else return -1;
-#elif cimg_OS==2
-      PROCESS_INFORMATION pi;
-      STARTUPINFO si;
-      std::memset(&pi,0,sizeof(PROCESS_INFORMATION));
-      std::memset(&si,0,sizeof(STARTUPINFO));
-      GetStartupInfo(&si);
-      si.cb = sizeof(si);
-      si.wShowWindow = SW_HIDE;
-      si.dwFlags |= SW_HIDE | STARTF_USESHOWWINDOW;
-      const BOOL res = CreateProcess((LPCTSTR)module_name,(LPTSTR)command,0,0,FALSE,0,0,0,&si,&pi);
-      if (res) {
-        WaitForSingleObject(pi.hProcess,INFINITE);
-        CloseHandle(pi.hThread);
-        CloseHandle(pi.hProcess);
-        return 0;
-      } else return std::system(command);
-#else
-      return std::system(command);
-#endif
-#endif
-    }
-
-    //! Return a reference to a temporary variable of type T.
-    template<typename T>
-    inline T& temporary(const T&) {
-      static T temp;
-      return temp;
-    }
-
-    //! Exchange values of variables \c a and \c b.
-    template<typename T>
-    inline void swap(T& a, T& b) { T t = a; a = b; b = t; }
-
-    //! Exchange values of variables (\c a1,\c a2) and (\c b1,\c b2).
-    template<typename T1, typename T2>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2) {
-      cimg::swap(a1,b1); cimg::swap(a2,b2);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,\c a3) and (\c b1,\c b2,\c b3).
-    template<typename T1, typename T2, typename T3>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3) {
-      cimg::swap(a1,b1,a2,b2); cimg::swap(a3,b3);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,...,\c a4) and (\c b1,\c b2,...,\c b4).
-    template<typename T1, typename T2, typename T3, typename T4>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4) {
-      cimg::swap(a1,b1,a2,b2,a3,b3); cimg::swap(a4,b4);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,...,\c a5) and (\c b1,\c b2,...,\c b5).
-    template<typename T1, typename T2, typename T3, typename T4, typename T5>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5) {
-      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4); cimg::swap(a5,b5);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,...,\c a6) and (\c b1,\c b2,...,\c b6).
-    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6) {
-      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5); cimg::swap(a6,b6);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,...,\c a7) and (\c b1,\c b2,...,\c b7).
-    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6,
-                     T7& a7, T7& b7) {
-      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5,a6,b6); cimg::swap(a7,b7);
-    }
-
-    //! Exchange values of variables (\c a1,\c a2,...,\c a8) and (\c b1,\c b2,...,\c b8).
-    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
-    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6,
-                     T7& a7, T7& b7, T8& a8, T8& b8) {
-      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5,a6,b6,a7,b7); cimg::swap(a8,b8);
-    }
-
-    //! Return the endianness of the current architecture.
-    /**
-       \return \c false for <i>Little Endian</i> or \c true for <i>Big Endian</i>.
-    **/
-    inline bool endianness() {
-      const int x = 1;
-      return ((unsigned char*)&x)[0]?false:true;
-    }
-
-    //! Reverse endianness of all elements in a memory buffer.
-    /**
-       \param[in,out] buffer Memory buffer whose endianness must be reversed.
-       \param size Number of buffer elements to reverse.
-    **/
-    template<typename T>
-    inline void invert_endianness(T* const buffer, const cimg_ulong size) {
-      if (size) switch (sizeof(T)) {
-        case 1 : break;
-        case 2 : { for (unsigned short *ptr = (unsigned short*)buffer + size; ptr>(unsigned short*)buffer; ) {
-              const unsigned short val = *(--ptr);
-              *ptr = (unsigned short)((val>>8)|((val<<8)));
-            }
-        } break;
-        case 4 : { for (unsigned int *ptr = (unsigned int*)buffer + size; ptr>(unsigned int*)buffer; ) {
-              const unsigned int val = *(--ptr);
-              *ptr = (val>>24)|((val>>8)&0xff00)|((val<<8)&0xff0000)|(val<<24);
-            }
-        } break;
-        default : { for (T* ptr = buffer + size; ptr>buffer; ) {
-              unsigned char *pb = (unsigned char*)(--ptr), *pe = pb + sizeof(T);
-              for (int i = 0; i<(int)sizeof(T)/2; ++i) swap(*(pb++),*(--pe));
-            }
-        }
-        }
-    }
-
-    //! Reverse endianness of a single variable.
-    /**
-       \param[in,out] a Variable to reverse.
-       \return Reference to reversed variable.
-    **/
-    template<typename T>
-    inline T& invert_endianness(T& a) {
-      invert_endianness(&a,1);
-      return a;
-    }
-
-    // Conversion functions to get more precision when trying to store unsigned ints values as floats.
-    inline unsigned int float2uint(const float f) {
-      int tmp = 0;
-      std::memcpy(&tmp,&f,sizeof(float));
-      if (tmp>=0) return (unsigned int)f;
-      unsigned int u;
-      // use memcpy instead of assignment to avoid undesired optimizations by C++-compiler.
-      std::memcpy(&u,&f,sizeof(float));
-      return ((u)<<1)>>1; // set sign bit to 0.
-    }
-
-    inline float uint2float(const unsigned int u) {
-      if (u<(1U<<19)) return (float)u;  // Consider safe storage of unsigned int as floats until 19bits (i.e 524287).
-      float f;
-      const unsigned int v = u|(1U<<(8*sizeof(unsigned int)-1)); // set sign bit to 1.
-      // use memcpy instead of simple assignment to avoid undesired optimizations by C++-compiler.
-      std::memcpy(&f,&v,sizeof(float));
-      return f;
-    }
-
-    //! Return the value of a system timer, with a millisecond precision.
-    /**
-       \note The timer does not necessarily starts from \c 0.
-    **/
-    inline cimg_ulong time() {
-#if cimg_OS==1
-      struct timeval st_time;
-      gettimeofday(&st_time,0);
-      return (cimg_ulong)(st_time.tv_usec/1000 + st_time.tv_sec*1000);
-#elif cimg_OS==2
-      SYSTEMTIME st_time;
-      GetLocalTime(&st_time);
-      return (cimg_ulong)(st_time.wMilliseconds + 1000*(st_time.wSecond + 60*(st_time.wMinute + 60*st_time.wHour)));
-#else
-      return 0;
-#endif
-    }
-
-    // Implement a tic/toc mechanism to display elapsed time of algorithms.
-    inline cimg_ulong tictoc(const bool is_tic);
-
-    //! Start tic/toc timer for time measurement between code instructions.
-    /**
-       \return Current value of the timer (same value as time()).
-    **/
-    inline cimg_ulong tic() {
-      return cimg::tictoc(true);
-    }
-
-    //! End tic/toc timer and displays elapsed time from last call to tic().
-    /**
-       \return Time elapsed (in ms) since last call to tic().
-    **/
-    inline cimg_ulong toc() {
-      return cimg::tictoc(false);
-    }
-
-    //! Sleep for a given numbers of milliseconds.
-    /**
-       \param milliseconds Number of milliseconds to wait for.
-       \note This function frees the CPU ressources during the sleeping time.
-       It can be used to temporize your program properly, without wasting CPU time.
-    **/
-    inline void sleep(const unsigned int milliseconds) {
-#if cimg_OS==1
-      struct timespec tv;
-      tv.tv_sec = milliseconds/1000;
-      tv.tv_nsec = (milliseconds%1000)*1000000;
-      nanosleep(&tv,0);
-#elif cimg_OS==2
-      Sleep(milliseconds);
-#else
-      cimg::unused(milliseconds);
-#endif
-    }
-
-    inline unsigned int _wait(const unsigned int milliseconds, cimg_ulong& timer) {
-      if (!timer) timer = cimg::time();
-      const cimg_ulong current_time = cimg::time();
-      if (current_time>=timer + milliseconds) { timer = current_time; return 0; }
-      const unsigned int time_diff = (unsigned int)(timer + milliseconds - current_time);
-      timer = current_time + time_diff;
-      cimg::sleep(time_diff);
-      return time_diff;
-    }
-
-    //! Wait for a given number of milliseconds since the last call to wait().
-    /**
-       \param milliseconds Number of milliseconds to wait for.
-       \return Number of milliseconds elapsed since the last call to wait().
-       \note Same as sleep() with a waiting time computed with regard to the last call
-       of wait(). It may be used to temporize your program properly, without wasting CPU time.
-    **/
-    inline cimg_long wait(const unsigned int milliseconds) {
-      cimg::mutex(3);
-      static cimg_ulong timer = 0;
-      if (!timer) timer = cimg::time();
-      cimg::mutex(3,0);
-      return _wait(milliseconds,timer);
-    }
-
-    // Random number generators.
-    // CImg may use its own Random Number Generator (RNG) if configuration macro 'cimg_use_rng' is set.
-    // Use it for instance when you have to deal with concurrent threads trying to call std::srand()
-    // at the same time!
-#ifdef cimg_use_rng
-
-#include <stdint.h>
-
-    // Use a custom RNG.
-    inline unsigned int _rand(const unsigned int seed=0, const bool set_seed=false) {
-      static cimg_ulong next = 0xB16B00B5;
-      cimg::mutex(4);
-      if (set_seed) next = (cimg_ulong)seed;
-      next = next*1103515245 + 12345U;
-      cimg::mutex(4,0);
-      return (unsigned int)(next&0xFFFFFFU);
-    }
-
-    inline void srand() {
-      const unsigned int t = (unsigned int)cimg::time();
-#if cimg_OS==1
-      cimg::_rand(t + (unsigned int)getpid(),true);
-#elif cimg_OS==2
-      cimg::_rand(t + (unsigned int)_getpid(),true);
-#else
-      cimg::_rand(t,true);
-#endif
-    }
-
-    inline void srand(const unsigned int seed) {
-      _rand(seed,true);
-    }
-
-    inline double rand(const double val_min, const double val_max) {
-      const double val = cimg::_rand()/16777215.;
-      return val_min + (val_max - val_min)*val;
-    }
-
-#else
-
-    // Use the system RNG.
-    inline void srand() {
-      const unsigned int t = (unsigned int)cimg::time();
-#if cimg_OS==1 || defined(__BORLANDC__)
-      std::srand(t + (unsigned int)getpid());
-#elif cimg_OS==2
-      std::srand(t + (unsigned int)_getpid());
-#else
-      std::srand(t);
-#endif
-    }
-
-    inline void srand(const unsigned int seed) {
-      std::srand(seed);
-    }
-
-    //! Return a random variable uniformely distributed between [val_min,val_max].
-    /**
-    **/
-    inline double rand(const double val_min, const double val_max) {
-      const double val = (double)std::rand()/RAND_MAX;
-      return val_min + (val_max - val_min)*val;
-    }
-#endif
-
-    //! Return a random variable uniformely distributed between [0,val_max].
-    /**
-     **/
-    inline double rand(const double val_max=1) {
-      return cimg::rand(0,val_max);
-    }
-
-    //! Return a random variable following a gaussian distribution and a standard deviation of 1.
-    /**
-    **/
-    inline double grand() {
-      double x1, w;
-      do {
-        const double x2 = cimg::rand(-1,1);
-        x1 = cimg::rand(-1,1);
-        w = x1*x1 + x2*x2;
-      } while (w<=0 || w>=1.0);
-      return x1*std::sqrt((-2*std::log(w))/w);
-    }
-
-    //! Return a random variable following a Poisson distribution of parameter z.
-    /**
-    **/
-    inline unsigned int prand(const double z) {
-      if (z<=1.0e-10) return 0;
-      if (z>100) return (unsigned int)((std::sqrt(z) * cimg::grand()) + z);
-      unsigned int k = 0;
-      const double y = std::exp(-z);
-      for (double s = 1.0; s>=y; ++k) s*=cimg::rand();
-      return k - 1;
-    }
-
-    //! Cut (i.e. clamp) value in specified interval.
-    template<typename T, typename t>
-    inline T cut(const T& val, const t& val_min, const t& val_max) {
-      return val<val_min?(T)val_min:val>val_max?(T)val_max:val;
-    }
-
-    //! Bitwise-rotate value on the left.
-    template<typename T>
-    inline T rol(const T& a, const unsigned int n=1) {
-      return n?(T)((a<<n)|(a>>((sizeof(T)<<3) - n))):a;
-    }
-
-    inline float rol(const float a, const unsigned int n=1) {
-      return (float)rol((int)a,n);
-    }
-
-    inline double rol(const double a, const unsigned int n=1) {
-      return (double)rol((cimg_long)a,n);
-    }
-
-    inline double rol(const long double a, const unsigned int n=1) {
-      return (double)rol((cimg_long)a,n);
-    }
-
-#ifdef cimg_use_half
-    inline half rol(const half a, const unsigned int n=1) {
-      return (half)rol((int)a,n);
-    }
-#endif
-
-    //! Bitwise-rotate value on the right.
-    template<typename T>
-    inline T ror(const T& a, const unsigned int n=1) {
-      return n?(T)((a>>n)|(a<<((sizeof(T)<<3) - n))):a;
-    }
-
-    inline float ror(const float a, const unsigned int n=1) {
-      return (float)ror((int)a,n);
-    }
-
-    inline double ror(const double a, const unsigned int n=1) {
-      return (double)ror((cimg_long)a,n);
-    }
-
-    inline double ror(const long double a, const unsigned int n=1) {
-      return (double)ror((cimg_long)a,n);
-    }
-
-#ifdef cimg_use_half
-    inline half ror(const half a, const unsigned int n=1) {
-      return (half)ror((int)a,n);
-    }
-#endif
-
-    //! Return absolute value of a value.
-    template<typename T>
-    inline T abs(const T& a) {
-      return a>=0?a:-a;
-    }
-    inline bool abs(const bool a) {
-      return a;
-    }
-    inline int abs(const unsigned char a) {
-      return (int)a;
-    }
-    inline int abs(const unsigned short a) {
-      return (int)a;
-    }
-    inline int abs(const unsigned int a) {
-      return (int)a;
-    }
-    inline int abs(const int a) {
-      return std::abs(a);
-    }
-    inline cimg_int64 abs(const cimg_uint64 a) {
-      return (cimg_int64)a;
-    }
-    inline double abs(const double a) {
-      return std::fabs(a);
-    }
-    inline float abs(const float a) {
-      return (float)std::fabs((double)a);
-    }
-
-    //! Return square of a value.
-    template<typename T>
-    inline T sqr(const T& val) {
-      return val*val;
-    }
-
-    //! Return <tt>1 + log_10(x)</tt> of a value \c x.
-    inline int xln(const int x) {
-      return x>0?(int)(1 + std::log10((double)x)):1;
-    }
-
-    //! Return the minimum between three values.
-    template<typename t>
-    inline t min(const t& a, const t& b, const t& c) {
-      return std::min(std::min(a,b),c);
-    }
-
-    //! Return the minimum between four values.
-    template<typename t>
-    inline t min(const t& a, const t& b, const t& c, const t& d) {
-      return std::min(std::min(a,b),std::min(c,d));
-    }
-
-    //! Return the maximum between three values.
-    template<typename t>
-    inline t max(const t& a, const t& b, const t& c) {
-      return std::max(std::max(a,b),c);
-    }
-
-    //! Return the maximum between four values.
-    template<typename t>
-    inline t max(const t& a, const t& b, const t& c, const t& d) {
-      return std::max(std::max(a,b),std::max(c,d));
-    }
-
-    //! Return the sign of a value.
-    template<typename T>
-    inline T sign(const T& x) {
-      return (T)(x<0?-1:x>0);
-    }
-
-    //! Return the nearest power of 2 higher than given value.
-    template<typename T>
-    inline cimg_ulong nearest_pow2(const T& x) {
-      cimg_ulong i = 1;
-      while (x>i) i<<=1;
-      return i;
-    }
-
-    //! Return the sinc of a given value.
-    inline double sinc(const double x) {
-      return x?std::sin(x)/x:1;
-    }
-
-    //! Return the modulo of a value.
-    /**
-       \param x Input value.
-       \param m Modulo value.
-       \note This modulo function accepts negative and floating-points modulo numbers, as well as variables of any type.
-    **/
-    template<typename T>
-    inline T mod(const T& x, const T& m) {
-      const double dx = (double)x, dm = (double)m;
-      return (T)(dx - dm * std::floor(dx / dm));
-    }
-    inline int mod(const bool x, const bool m) {
-      return m?(x?1:0):0;
-    }
-    inline int mod(const unsigned char x, const unsigned char m) {
-      return x%m;
-    }
-    inline int mod(const char x, const char m) {
-#if defined(CHAR_MAX) && CHAR_MAX==255
-      return x%m;
-#else
-      return x>=0?x%m:(x%m?m + x%m:0);
-#endif
-    }
-    inline int mod(const unsigned short x, const unsigned short m) {
-      return x%m;
-    }
-    inline int mod(const short x, const short m) {
-      return x>=0?x%m:(x%m?m + x%m:0);
-    }
-    inline int mod(const unsigned int x, const unsigned int m) {
-      return (int)(x%m);
-    }
-    inline int mod(const int x, const int m) {
-      return x>=0?x%m:(x%m?m + x%m:0);
-    }
-    inline cimg_int64 mod(const cimg_uint64 x, const cimg_uint64 m) {
-      return x%m;
-    }
-    inline cimg_int64 mod(const cimg_int64 x, const cimg_int64 m) {
-      return x>=0?x%m:(x%m?m + x%m:0);
-    }
-
-    //! Return the min-mod of two values.
-    /**
-       \note <i>minmod(\p a,\p b)</i> is defined to be:
-       - <i>minmod(\p a,\p b) = min(\p a,\p b)</i>, if \p a and \p b have the same sign.
-       - <i>minmod(\p a,\p b) = 0</i>, if \p a and \p b have different signs.
-    **/
-    template<typename T>
-    inline T minmod(const T& a, const T& b) {
-      return a*b<=0?0:(a>0?(a<b?a:b):(a<b?b:a));
-    }
-
-    //! Return base-2 logarithm of a value.
-    inline double log2(const double x) {
-      const double base = std::log(2.0);
-      return std::log(x)/base;
-    }
-
-    template<typename T>
-    inline T round(const T& x) {
-      return (T)std::floor((_cimg_Tfloat)x + 0.5f);
-    }
-
-    //! Return rounded value.
-    /**
-       \param x Value to be rounded.
-       \param y Rounding precision.
-       \param rounding_type Type of rounding operation (\c 0 = nearest, \c -1 = backward, \c 1 = forward).
-       \return Rounded value, having the same type as input value \c x.
-    **/
-    template<typename T>
-    inline T round(const T& x, const double y, const int rounding_type=0) {
-      if (y<=0) return x;
-      if (y==1) switch (rounding_type) {
-        case 0 : return round(x);
-        case 1 : return (T)std::ceil((_cimg_Tfloat)x);
-        default : return (T)std::floor((_cimg_Tfloat)x);
-        }
-      const double sx = (double)x/y, floor = std::floor(sx), delta =  sx - floor;
-      return (T)(y*(rounding_type<0?floor:rounding_type>0?std::ceil(sx):delta<0.5?floor:std::ceil(sx)));
-    }
-
-    //! Return x^(1/3).
-    template<typename T>
-    inline double cbrt(const T& x) {
-#if cimg_use_cpp11==1
-      return std::cbrt(x);
-#else
-      return x>=0?std::pow((double)x,1.0/3):-std::pow(-(double)x,1.0/3);
-#endif
-    }
-
-    // Code to compute fast median from 2,3,5,7,9,13,25 and 49 values.
-    // (contribution by RawTherapee: http://rawtherapee.com/).
-    template<typename T>
-    inline T median(T val0, T val1) {
-      return (val0 + val1)/2;
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2) {
-      return std::max(std::min(val0,val1),std::min(val2,std::max(val0,val1)));
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4) {
-      T tmp = std::min(val0,val1);
-      val1 = std::max(val0,val1); val0 = tmp; tmp = std::min(val3,val4); val4 = std::max(val3,val4);
-      val3 = std::max(val0,tmp);  val1 = std::min(val1,val4); tmp = std::min(val1,val2); val2 = std::max(val1,val2);
-      val1 = tmp; tmp = std::min(val2,val3);
-      return std::max(val1,tmp);
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4, T val5, T val6) {
-      T tmp = std::min(val0,val5);
-      val5 = std::max(val0,val5); val0 = tmp; tmp = std::min(val0,val3); val3 = std::max(val0,val3); val0 = tmp;
-      tmp = std::min(val1,val6); val6 = std::max(val1,val6); val1 = tmp; tmp = std::min(val2,val4);
-      val4 = std::max(val2,val4); val2 = tmp; val1 = std::max(val0,val1); tmp = std::min(val3,val5);
-      val5 = std::max(val3,val5); val3 = tmp; tmp = std::min(val2,val6); val6 = std::max(val2,val6);
-      val3 = std::max(tmp,val3); val3 = std::min(val3,val6); tmp = std::min(val4,val5); val4 = std::max(val1,tmp);
-      tmp = std::min(val1,tmp); val3 = std::max(tmp,val3);
-      return std::min(val3,val4);
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4, T val5, T val6, T val7, T val8) {
-      T tmp = std::min(val1,val2);
-      val2 = std::max(val1,val2); val1 = tmp; tmp = std::min(val4,val5);
-      val5 = std::max(val4,val5); val4 = tmp; tmp = std::min(val7,val8);
-      val8 = std::max(val7,val8); val7 = tmp; tmp = std::min(val0,val1);
-      val1 = std::max(val0,val1); val0 = tmp; tmp = std::min(val3,val4);
-      val4 = std::max(val3,val4); val3 = tmp; tmp = std::min(val6,val7);
-      val7 = std::max(val6,val7); val6 = tmp; tmp = std::min(val1,val2);
-      val2 = std::max(val1,val2); val1 = tmp; tmp = std::min(val4,val5);
-      val5 = std::max(val4,val5); val4 = tmp; tmp = std::min(val7,val8);
-      val8 = std::max(val7,val8); val3 = std::max(val0,val3); val5 = std::min(val5,val8);
-      val7 = std::max(val4,tmp); tmp = std::min(val4,tmp); val6 = std::max(val3,val6);
-      val4 = std::max(val1,tmp); val2 = std::min(val2,val5); val4 = std::min(val4,val7);
-      tmp = std::min(val4,val2); val2 = std::max(val4,val2); val4 = std::max(val6,tmp);
-      return std::min(val4,val2);
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4, T val5, T val6, T val7, T val8, T val9, T val10, T val11,
-                    T val12) {
-      T tmp = std::min(val1,val7);
-      val7 = std::max(val1,val7); val1 = tmp; tmp = std::min(val9,val11); val11 = std::max(val9,val11); val9 = tmp;
-      tmp = std::min(val3,val4);  val4 = std::max(val3,val4); val3 = tmp; tmp = std::min(val5,val8);
-      val8 = std::max(val5,val8); val5 = tmp; tmp = std::min(val0,val12); val12 = std::max(val0,val12);
-      val0 = tmp; tmp = std::min(val2,val6); val6 = std::max(val2,val6); val2 = tmp; tmp = std::min(val0,val1);
-      val1 = std::max(val0,val1); val0 = tmp; tmp = std::min(val2,val3); val3 = std::max(val2,val3); val2 = tmp;
-      tmp = std::min(val4,val6);  val6 = std::max(val4,val6); val4 = tmp; tmp = std::min(val8,val11);
-      val11 = std::max(val8,val11); val8 = tmp; tmp = std::min(val7,val12); val12 = std::max(val7,val12); val7 = tmp;
-      tmp = std::min(val5,val9); val9 = std::max(val5,val9); val5 = tmp; tmp = std::min(val0,val2);
-      val2 = std::max(val0,val2); val0 = tmp; tmp = std::min(val3,val7); val7 = std::max(val3,val7); val3 = tmp;
-      tmp = std::min(val10,val11); val11 = std::max(val10,val11); val10 = tmp; tmp = std::min(val1,val4);
-      val4 = std::max(val1,val4); val1 = tmp; tmp = std::min(val6,val12); val12 = std::max(val6,val12); val6 = tmp;
-      tmp = std::min(val7,val8); val8 = std::max(val7,val8); val7 = tmp; val11 = std::min(val11,val12);
-      tmp = std::min(val4,val9); val9 = std::max(val4,val9); val4 = tmp; tmp = std::min(val6,val10);
-      val10 = std::max(val6,val10); val6 = tmp; tmp = std::min(val3,val4); val4 = std::max(val3,val4); val3 = tmp;
-      tmp = std::min(val5,val6); val6 = std::max(val5,val6); val5 = tmp; val8 = std::min(val8,val9);
-      val10 = std::min(val10,val11); tmp = std::min(val1,val7); val7 = std::max(val1,val7); val1 = tmp;
-      tmp = std::min(val2,val6); val6 = std::max(val2,val6); val2 = tmp; val3 = std::max(val1,val3);
-      tmp = std::min(val4,val7); val7 = std::max(val4,val7); val4 = tmp; val8 = std::min(val8,val10);
-      val5 = std::max(val0,val5); val5 = std::max(val2,val5); tmp = std::min(val6,val8); val8 = std::max(val6,val8);
-      val5 = std::max(val3,val5); val7 = std::min(val7,val8); val6 = std::max(val4,tmp); tmp = std::min(val4,tmp);
-      val5 = std::max(tmp,val5); val6 = std::min(val6,val7);
-      return std::max(val5,val6);
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4,
-                    T val5, T val6, T val7, T val8, T val9,
-                    T val10, T val11, T val12, T val13, T val14,
-                    T val15, T val16, T val17, T val18, T val19,
-                    T val20, T val21, T val22, T val23, T val24) {
-      T tmp = std::min(val0,val1);
-      val1 = std::max(val0,val1); val0 = tmp; tmp = std::min(val3,val4); val4 = std::max(val3,val4);
-      val3 = tmp; tmp = std::min(val2,val4); val4 = std::max(val2,val4); val2 = std::min(tmp,val3);
-      val3 = std::max(tmp,val3); tmp = std::min(val6,val7); val7 = std::max(val6,val7); val6 = tmp;
-      tmp = std::min(val5,val7); val7 = std::max(val5,val7); val5 = std::min(tmp,val6); val6 = std::max(tmp,val6);
-      tmp = std::min(val9,val10); val10 = std::max(val9,val10); val9 = tmp; tmp = std::min(val8,val10);
-      val10 = std::max(val8,val10); val8 = std::min(tmp,val9); val9 = std::max(tmp,val9);
-      tmp = std::min(val12,val13); val13 = std::max(val12,val13); val12 = tmp; tmp = std::min(val11,val13);
-      val13 = std::max(val11,val13); val11 = std::min(tmp,val12); val12 = std::max(tmp,val12);
-      tmp = std::min(val15,val16); val16 = std::max(val15,val16); val15 = tmp; tmp = std::min(val14,val16);
-      val16 = std::max(val14,val16); val14 = std::min(tmp,val15); val15 = std::max(tmp,val15);
-      tmp = std::min(val18,val19); val19 = std::max(val18,val19); val18 = tmp; tmp = std::min(val17,val19);
-      val19 = std::max(val17,val19); val17 = std::min(tmp,val18); val18 = std::max(tmp,val18);
-      tmp = std::min(val21,val22); val22 = std::max(val21,val22); val21 = tmp; tmp = std::min(val20,val22);
-      val22 = std::max(val20,val22); val20 = std::min(tmp,val21); val21 = std::max(tmp,val21);
-      tmp = std::min(val23,val24); val24 = std::max(val23,val24); val23 = tmp; tmp = std::min(val2,val5);
-      val5 = std::max(val2,val5); val2 = tmp; tmp = std::min(val3,val6); val6 = std::max(val3,val6); val3 = tmp;
-      tmp = std::min(val0,val6); val6 = std::max(val0,val6); val0 = std::min(tmp,val3); val3 = std::max(tmp,val3);
-      tmp = std::min(val4,val7); val7 = std::max(val4,val7); val4 = tmp; tmp = std::min(val1,val7);
-      val7 = std::max(val1,val7); val1 = std::min(tmp,val4); val4 = std::max(tmp,val4); tmp = std::min(val11,val14);
-      val14 = std::max(val11,val14); val11 = tmp; tmp = std::min(val8,val14); val14 = std::max(val8,val14);
-      val8 = std::min(tmp,val11); val11 = std::max(tmp,val11); tmp = std::min(val12,val15);
-      val15 = std::max(val12,val15); val12 = tmp; tmp = std::min(val9,val15); val15 = std::max(val9,val15);
-      val9 = std::min(tmp,val12); val12 = std::max(tmp,val12); tmp = std::min(val13,val16);
-      val16 = std::max(val13,val16); val13 = tmp; tmp = std::min(val10,val16); val16 = std::max(val10,val16);
-      val10 = std::min(tmp,val13); val13 = std::max(tmp,val13); tmp = std::min(val20,val23);
-      val23 = std::max(val20,val23); val20 = tmp; tmp = std::min(val17,val23); val23 = std::max(val17,val23);
-      val17 = std::min(tmp,val20); val20 = std::max(tmp,val20); tmp = std::min(val21,val24);
-      val24 = std::max(val21,val24); val21 = tmp; tmp = std::min(val18,val24); val24 = std::max(val18,val24);
-      val18 = std::min(tmp,val21); val21 = std::max(tmp,val21); tmp = std::min(val19,val22);
-      val22 = std::max(val19,val22); val19 = tmp; val17 = std::max(val8,val17); tmp = std::min(val9,val18);
-      val18 = std::max(val9,val18); val9 = tmp; tmp = std::min(val0,val18); val18 = std::max(val0,val18);
-      val9 = std::max(tmp,val9); tmp = std::min(val10,val19); val19 = std::max(val10,val19); val10 = tmp;
-      tmp = std::min(val1,val19); val19 = std::max(val1,val19); val1 = std::min(tmp,val10);
-      val10 = std::max(tmp,val10); tmp = std::min(val11,val20); val20 = std::max(val11,val20); val11 = tmp;
-      tmp = std::min(val2,val20); val20 = std::max(val2,val20); val11 = std::max(tmp,val11);
-      tmp = std::min(val12,val21); val21 = std::max(val12,val21); val12 = tmp; tmp = std::min(val3,val21);
-      val21 = std::max(val3,val21); val3 = std::min(tmp,val12); val12 = std::max(tmp,val12);
-      tmp = std::min(val13,val22); val22 = std::max(val13,val22); val4 = std::min(val4,val22);
-      val13 = std::max(val4,tmp); tmp = std::min(val4,tmp); val4 = tmp; tmp = std::min(val14,val23);
-      val23 = std::max(val14,val23); val14 = tmp; tmp = std::min(val5,val23); val23 = std::max(val5,val23);
-      val5 = std::min(tmp,val14); val14 = std::max(tmp,val14); tmp = std::min(val15,val24);
-      val24 = std::max(val15,val24); val15 = tmp; val6 = std::min(val6,val24); tmp = std::min(val6,val15);
-      val15 = std::max(val6,val15); val6 = tmp; tmp = std::min(val7,val16); val7 = std::min(tmp,val19);
-      tmp = std::min(val13,val21); val15 = std::min(val15,val23); tmp = std::min(val7,tmp);
-      val7 = std::min(tmp,val15); val9 = std::max(val1,val9); val11 = std::max(val3,val11);
-      val17 = std::max(val5,val17); val17 = std::max(val11,val17); val17 = std::max(val9,val17);
-      tmp = std::min(val4,val10); val10 = std::max(val4,val10); val4 = tmp; tmp = std::min(val6,val12);
-      val12 = std::max(val6,val12); val6 = tmp; tmp = std::min(val7,val14); val14 = std::max(val7,val14);
-      val7 = tmp; tmp = std::min(val4,val6); val6 = std::max(val4,val6); val7 = std::max(tmp,val7);
-      tmp = std::min(val12,val14); val14 = std::max(val12,val14); val12 = tmp; val10 = std::min(val10,val14);
-      tmp = std::min(val6,val7); val7 = std::max(val6,val7); val6 = tmp; tmp = std::min(val10,val12);
-      val12 = std::max(val10,val12); val10 = std::max(val6,tmp); tmp = std::min(val6,tmp);
-      val17 = std::max(tmp,val17); tmp = std::min(val12,val17); val17 = std::max(val12,val17); val12 = tmp;
-      val7 = std::min(val7,val17); tmp = std::min(val7,val10); val10 = std::max(val7,val10); val7 = tmp;
-      tmp = std::min(val12,val18); val18 = std::max(val12,val18); val12 = std::max(val7,tmp);
-      val10 = std::min(val10,val18); tmp = std::min(val12,val20); val20 = std::max(val12,val20); val12 = tmp;
-      tmp = std::min(val10,val20);
-      return std::max(tmp,val12);
-    }
-
-    template<typename T>
-    inline T median(T val0, T val1, T val2, T val3, T val4, T val5, T val6,
-                    T val7, T val8, T val9, T val10, T val11, T val12, T val13,
-                    T val14, T val15, T val16, T val17, T val18, T val19, T val20,
-                    T val21, T val22, T val23, T val24, T val25, T val26, T val27,
-                    T val28, T val29, T val30, T val31, T val32, T val33, T val34,
-                    T val35, T val36, T val37, T val38, T val39, T val40, T val41,
-                    T val42, T val43, T val44, T val45, T val46, T val47, T val48) {
-      T tmp = std::min(val0,val32);
-      val32 = std::max(val0,val32); val0 = tmp; tmp = std::min(val1,val33); val33 = std::max(val1,val33); val1 = tmp;
-      tmp = std::min(val2,val34); val34 = std::max(val2,val34); val2 = tmp; tmp = std::min(val3,val35);
-      val35 = std::max(val3,val35); val3 = tmp; tmp = std::min(val4,val36); val36 = std::max(val4,val36); val4 = tmp;
-      tmp = std::min(val5,val37); val37 = std::max(val5,val37); val5 = tmp; tmp = std::min(val6,val38);
-      val38 = std::max(val6,val38); val6 = tmp; tmp = std::min(val7,val39); val39 = std::max(val7,val39); val7 = tmp;
-      tmp = std::min(val8,val40); val40 = std::max(val8,val40); val8 = tmp; tmp = std::min(val9,val41);
-      val41 = std::max(val9,val41); val9 = tmp; tmp = std::min(val10,val42); val42 = std::max(val10,val42);
-      val10 = tmp; tmp = std::min(val11,val43); val43 = std::max(val11,val43); val11 = tmp;
-      tmp = std::min(val12,val44); val44 = std::max(val12,val44); val12 = tmp; tmp = std::min(val13,val45);
-      val45 = std::max(val13,val45); val13 = tmp; tmp = std::min(val14,val46); val46 = std::max(val14,val46);
-      val14 = tmp; tmp = std::min(val15,val47); val47 = std::max(val15,val47); val15 = tmp;
-      tmp = std::min(val16,val48); val48 = std::max(val16,val48); val16 = tmp; tmp = std::min(val0,val16);
-      val16 = std::max(val0,val16); val0 = tmp; tmp = std::min(val1,val17); val17 = std::max(val1,val17);
-      val1 = tmp; tmp = std::min(val2,val18); val18 = std::max(val2,val18); val2 = tmp; tmp = std::min(val3,val19);
-      val19 = std::max(val3,val19); val3 = tmp; tmp = std::min(val4,val20); val20 = std::max(val4,val20); val4 = tmp;
-      tmp = std::min(val5,val21); val21 = std::max(val5,val21); val5 = tmp; tmp = std::min(val6,val22);
-      val22 = std::max(val6,val22); val6 = tmp; tmp = std::min(val7,val23); val23 = std::max(val7,val23); val7 = tmp;
-      tmp = std::min(val8,val24); val24 = std::max(val8,val24); val8 = tmp; tmp = std::min(val9,val25);
-      val25 = std::max(val9,val25); val9 = tmp; tmp = std::min(val10,val26); val26 = std::max(val10,val26);
-      val10 = tmp; tmp = std::min(val11,val27); val27 = std::max(val11,val27); val11 = tmp;
-      tmp = std::min(val12,val28); val28 = std::max(val12,val28); val12 = tmp; tmp = std::min(val13,val29);
-      val29 = std::max(val13,val29); val13 = tmp; tmp = std::min(val14,val30); val30 = std::max(val14,val30);
-      val14 = tmp; tmp = std::min(val15,val31); val31 = std::max(val15,val31); val15 = tmp;
-      tmp = std::min(val32,val48); val48 = std::max(val32,val48); val32 = tmp; tmp = std::min(val16,val32);
-      val32 = std::max(val16,val32); val16 = tmp; tmp = std::min(val17,val33); val33 = std::max(val17,val33);
-      val17 = tmp; tmp = std::min(val18,val34); val34 = std::max(val18,val34); val18 = tmp;
-      tmp = std::min(val19,val35); val35 = std::max(val19,val35); val19 = tmp; tmp = std::min(val20,val36);
-      val36 = std::max(val20,val36); val20 = tmp; tmp = std::min(val21,val37); val37 = std::max(val21,val37);
-      val21 = tmp; tmp = std::min(val22,val38); val38 = std::max(val22,val38); val22 = tmp;
-      tmp = std::min(val23,val39); val39 = std::max(val23,val39); val23 = tmp; tmp = std::min(val24,val40);
-      val40 = std::max(val24,val40); val24 = tmp; tmp = std::min(val25,val41); val41 = std::max(val25,val41);
-      val25 = tmp; tmp = std::min(val26,val42); val42 = std::max(val26,val42); val26 = tmp;
-      tmp = std::min(val27,val43); val43 = std::max(val27,val43); val27 = tmp; tmp = std::min(val28,val44);
-      val44 = std::max(val28,val44); val28 = tmp; tmp = std::min(val29,val45); val45 = std::max(val29,val45);
-      val29 = tmp; tmp = std::min(val30,val46); val46 = std::max(val30,val46); val30 = tmp;
-      tmp = std::min(val31,val47); val47 = std::max(val31,val47); val31 = tmp; tmp = std::min(val0,val8);
-      val8 = std::max(val0,val8); val0 = tmp; tmp = std::min(val1,val9); val9 = std::max(val1,val9); val1 = tmp;
-      tmp = std::min(val2,val10); val10 = std::max(val2,val10); val2 = tmp; tmp = std::min(val3,val11);
-      val11 = std::max(val3,val11); val3 = tmp; tmp = std::min(val4,val12); val12 = std::max(val4,val12); val4 = tmp;
-      tmp = std::min(val5,val13); val13 = std::max(val5,val13); val5 = tmp; tmp = std::min(val6,val14);
-      val14 = std::max(val6,val14); val6 = tmp; tmp = std::min(val7,val15); val15 = std::max(val7,val15); val7 = tmp;
-      tmp = std::min(val16,val24); val24 = std::max(val16,val24); val16 = tmp; tmp = std::min(val17,val25);
-      val25 = std::max(val17,val25); val17 = tmp; tmp = std::min(val18,val26); val26 = std::max(val18,val26);
-      val18 = tmp; tmp = std::min(val19,val27); val27 = std::max(val19,val27); val19 = tmp;
-      tmp = std::min(val20,val28); val28 = std::max(val20,val28); val20 = tmp; tmp = std::min(val21,val29);
-      val29 = std::max(val21,val29); val21 = tmp; tmp = std::min(val22,val30); val30 = std::max(val22,val30);
-      val22 = tmp; tmp = std::min(val23,val31); val31 = std::max(val23,val31); val23 = tmp;
-      tmp = std::min(val32,val40); val40 = std::max(val32,val40); val32 = tmp; tmp = std::min(val33,val41);
-      val41 = std::max(val33,val41); val33 = tmp; tmp = std::min(val34,val42); val42 = std::max(val34,val42);
-      val34 = tmp; tmp = std::min(val35,val43); val43 = std::max(val35,val43); val35 = tmp;
-      tmp = std::min(val36,val44); val44 = std::max(val36,val44); val36 = tmp; tmp = std::min(val37,val45);
-      val45 = std::max(val37,val45); val37 = tmp; tmp = std::min(val38,val46); val46 = std::max(val38,val46);
-      val38 = tmp; tmp = std::min(val39,val47); val47 = std::max(val39,val47); val39 = tmp;
-      tmp = std::min(val8,val32); val32 = std::max(val8,val32); val8 = tmp; tmp = std::min(val9,val33);
-      val33 = std::max(val9,val33); val9 = tmp; tmp = std::min(val10,val34); val34 = std::max(val10,val34);
-      val10 = tmp; tmp = std::min(val11,val35); val35 = std::max(val11,val35); val11 = tmp;
-      tmp = std::min(val12,val36); val36 = std::max(val12,val36); val12 = tmp; tmp = std::min(val13,val37);
-      val37 = std::max(val13,val37); val13 = tmp; tmp = std::min(val14,val38); val38 = std::max(val14,val38);
-      val14 = tmp; tmp = std::min(val15,val39); val39 = std::max(val15,val39); val15 = tmp;
-      tmp = std::min(val24,val48); val48 = std::max(val24,val48); val24 = tmp; tmp = std::min(val8,val16);
-      val16 = std::max(val8,val16); val8 = tmp; tmp = std::min(val9,val17); val17 = std::max(val9,val17);
-      val9 = tmp; tmp = std::min(val10,val18); val18 = std::max(val10,val18); val10 = tmp;
-      tmp = std::min(val11,val19); val19 = std::max(val11,val19); val11 = tmp; tmp = std::min(val12,val20);
-      val20 = std::max(val12,val20); val12 = tmp; tmp = std::min(val13,val21); val21 = std::max(val13,val21);
-      val13 = tmp; tmp = std::min(val14,val22); val22 = std::max(val14,val22); val14 = tmp;
-      tmp = std::min(val15,val23); val23 = std::max(val15,val23); val15 = tmp; tmp = std::min(val24,val32);
-      val32 = std::max(val24,val32); val24 = tmp; tmp = std::min(val25,val33); val33 = std::max(val25,val33);
-      val25 = tmp; tmp = std::min(val26,val34); val34 = std::max(val26,val34); val26 = tmp;
-      tmp = std::min(val27,val35); val35 = std::max(val27,val35); val27 = tmp; tmp = std::min(val28,val36);
-      val36 = std::max(val28,val36); val28 = tmp; tmp = std::min(val29,val37); val37 = std::max(val29,val37);
-      val29 = tmp; tmp = std::min(val30,val38); val38 = std::max(val30,val38); val30 = tmp;
-      tmp = std::min(val31,val39); val39 = std::max(val31,val39); val31 = tmp; tmp = std::min(val40,val48);
-      val48 = std::max(val40,val48); val40 = tmp; tmp = std::min(val0,val4); val4 = std::max(val0,val4);
-      val0 = tmp; tmp = std::min(val1,val5); val5 = std::max(val1,val5); val1 = tmp; tmp = std::min(val2,val6);
-      val6 = std::max(val2,val6); val2 = tmp; tmp = std::min(val3,val7); val7 = std::max(val3,val7); val3 = tmp;
-      tmp = std::min(val8,val12); val12 = std::max(val8,val12); val8 = tmp; tmp = std::min(val9,val13);
-      val13 = std::max(val9,val13); val9 = tmp; tmp = std::min(val10,val14); val14 = std::max(val10,val14);
-      val10 = tmp; tmp = std::min(val11,val15); val15 = std::max(val11,val15); val11 = tmp;
-      tmp = std::min(val16,val20); val20 = std::max(val16,val20); val16 = tmp; tmp = std::min(val17,val21);
-      val21 = std::max(val17,val21); val17 = tmp; tmp = std::min(val18,val22); val22 = std::max(val18,val22);
-      val18 = tmp; tmp = std::min(val19,val23); val23 = std::max(val19,val23); val19 = tmp;
-      tmp = std::min(val24,val28); val28 = std::max(val24,val28); val24 = tmp; tmp = std::min(val25,val29);
-      val29 = std::max(val25,val29); val25 = tmp; tmp = std::min(val26,val30); val30 = std::max(val26,val30);
-      val26 = tmp; tmp = std::min(val27,val31); val31 = std::max(val27,val31); val27 = tmp;
-      tmp = std::min(val32,val36); val36 = std::max(val32,val36); val32 = tmp; tmp = std::min(val33,val37);
-      val37 = std::max(val33,val37); val33 = tmp; tmp = std::min(val34,val38); val38 = std::max(val34,val38);
-      val34 = tmp; tmp = std::min(val35,val39); val39 = std::max(val35,val39); val35 = tmp;
-      tmp = std::min(val40,val44); val44 = std::max(val40,val44); val40 = tmp; tmp = std::min(val41,val45);
-      val45 = std::max(val41,val45); val41 = tmp; tmp = std::min(val42,val46); val46 = std::max(val42,val46);
-      val42 = tmp; tmp = std::min(val43,val47); val47 = std::max(val43,val47); val43 = tmp;
-      tmp = std::min(val4,val32); val32 = std::max(val4,val32); val4 = tmp; tmp = std::min(val5,val33);
-      val33 = std::max(val5,val33); val5 = tmp; tmp = std::min(val6,val34); val34 = std::max(val6,val34);
-      val6 = tmp; tmp = std::min(val7,val35); val35 = std::max(val7,val35); val7 = tmp;
-      tmp = std::min(val12,val40); val40 = std::max(val12,val40); val12 = tmp; tmp = std::min(val13,val41);
-      val41 = std::max(val13,val41); val13 = tmp; tmp = std::min(val14,val42); val42 = std::max(val14,val42);
-      val14 = tmp; tmp = std::min(val15,val43); val43 = std::max(val15,val43); val15 = tmp;
-      tmp = std::min(val20,val48); val48 = std::max(val20,val48); val20 = tmp; tmp = std::min(val4,val16);
-      val16 = std::max(val4,val16); val4 = tmp; tmp = std::min(val5,val17); val17 = std::max(val5,val17);
-      val5 = tmp; tmp = std::min(val6,val18); val18 = std::max(val6,val18); val6 = tmp;
-      tmp = std::min(val7,val19); val19 = std::max(val7,val19); val7 = tmp; tmp = std::min(val12,val24);
-      val24 = std::max(val12,val24); val12 = tmp; tmp = std::min(val13,val25); val25 = std::max(val13,val25);
-      val13 = tmp; tmp = std::min(val14,val26); val26 = std::max(val14,val26); val14 = tmp;
-      tmp = std::min(val15,val27); val27 = std::max(val15,val27); val15 = tmp; tmp = std::min(val20,val32);
-      val32 = std::max(val20,val32); val20 = tmp; tmp = std::min(val21,val33); val33 = std::max(val21,val33);
-      val21 = tmp; tmp = std::min(val22,val34); val34 = std::max(val22,val34); val22 = tmp;
-      tmp = std::min(val23,val35); val35 = std::max(val23,val35); val23 = tmp; tmp = std::min(val28,val40);
-      val40 = std::max(val28,val40); val28 = tmp; tmp = std::min(val29,val41); val41 = std::max(val29,val41);
-      val29 = tmp; tmp = std::min(val30,val42); val42 = std::max(val30,val42); val30 = tmp;
-      tmp = std::min(val31,val43); val43 = std::max(val31,val43); val31 = tmp; tmp = std::min(val36,val48);
-      val48 = std::max(val36,val48); val36 = tmp; tmp = std::min(val4,val8); val8 = std::max(val4,val8);
-      val4 = tmp; tmp = std::min(val5,val9); val9 = std::max(val5,val9); val5 = tmp; tmp = std::min(val6,val10);
-      val10 = std::max(val6,val10); val6 = tmp; tmp = std::min(val7,val11); val11 = std::max(val7,val11); val7 = tmp;
-      tmp = std::min(val12,val16); val16 = std::max(val12,val16); val12 = tmp; tmp = std::min(val13,val17);
-      val17 = std::max(val13,val17); val13 = tmp; tmp = std::min(val14,val18); val18 = std::max(val14,val18);
-      val14 = tmp; tmp = std::min(val15,val19); val19 = std::max(val15,val19); val15 = tmp;
-      tmp = std::min(val20,val24); val24 = std::max(val20,val24); val20 = tmp; tmp = std::min(val21,val25);
-      val25 = std::max(val21,val25); val21 = tmp; tmp = std::min(val22,val26); val26 = std::max(val22,val26);
-      val22 = tmp; tmp = std::min(val23,val27); val27 = std::max(val23,val27); val23 = tmp;
-      tmp = std::min(val28,val32); val32 = std::max(val28,val32); val28 = tmp; tmp = std::min(val29,val33);
-      val33 = std::max(val29,val33); val29 = tmp; tmp = std::min(val30,val34); val34 = std::max(val30,val34);
-      val30 = tmp; tmp = std::min(val31,val35); val35 = std::max(val31,val35); val31 = tmp;
-      tmp = std::min(val36,val40); val40 = std::max(val36,val40); val36 = tmp; tmp = std::min(val37,val41);
-      val41 = std::max(val37,val41); val37 = tmp; tmp = std::min(val38,val42); val42 = std::max(val38,val42);
-      val38 = tmp; tmp = std::min(val39,val43); val43 = std::max(val39,val43); val39 = tmp;
-      tmp = std::min(val44,val48); val48 = std::max(val44,val48); val44 = tmp; tmp = std::min(val0,val2);
-      val2 = std::max(val0,val2); val0 = tmp; tmp = std::min(val1,val3); val3 = std::max(val1,val3); val1 = tmp;
-      tmp = std::min(val4,val6); val6 = std::max(val4,val6); val4 = tmp; tmp = std::min(val5,val7);
-      val7 = std::max(val5,val7); val5 = tmp; tmp = std::min(val8,val10); val10 = std::max(val8,val10); val8 = tmp;
-      tmp = std::min(val9,val11); val11 = std::max(val9,val11); val9 = tmp; tmp = std::min(val12,val14);
-      val14 = std::max(val12,val14); val12 = tmp; tmp = std::min(val13,val15); val15 = std::max(val13,val15);
-      val13 = tmp; tmp = std::min(val16,val18); val18 = std::max(val16,val18); val16 = tmp;
-      tmp = std::min(val17,val19); val19 = std::max(val17,val19); val17 = tmp; tmp = std::min(val20,val22);
-      val22 = std::max(val20,val22); val20 = tmp; tmp = std::min(val21,val23); val23 = std::max(val21,val23);
-      val21 = tmp; tmp = std::min(val24,val26); val26 = std::max(val24,val26); val24 = tmp;
-      tmp = std::min(val25,val27); val27 = std::max(val25,val27); val25 = tmp; tmp = std::min(val28,val30);
-      val30 = std::max(val28,val30); val28 = tmp; tmp = std::min(val29,val31); val31 = std::max(val29,val31);
-      val29 = tmp; tmp = std::min(val32,val34); val34 = std::max(val32,val34); val32 = tmp;
-      tmp = std::min(val33,val35); val35 = std::max(val33,val35); val33 = tmp; tmp = std::min(val36,val38);
-      val38 = std::max(val36,val38); val36 = tmp; tmp = std::min(val37,val39); val39 = std::max(val37,val39);
-      val37 = tmp; tmp = std::min(val40,val42); val42 = std::max(val40,val42); val40 = tmp;
-      tmp = std::min(val41,val43); val43 = std::max(val41,val43); val41 = tmp; tmp = std::min(val44,val46);
-      val46 = std::max(val44,val46); val44 = tmp; tmp = std::min(val45,val47); val47 = std::max(val45,val47);
-      val45 = tmp; tmp = std::min(val2,val32); val32 = std::max(val2,val32); val2 = tmp; tmp = std::min(val3,val33);
-      val33 = std::max(val3,val33); val3 = tmp; tmp = std::min(val6,val36); val36 = std::max(val6,val36); val6 = tmp;
-      tmp = std::min(val7,val37); val37 = std::max(val7,val37); val7 = tmp; tmp = std::min(val10,val40);
-      val40 = std::max(val10,val40); val10 = tmp; tmp = std::min(val11,val41); val41 = std::max(val11,val41);
-      val11 = tmp; tmp = std::min(val14,val44); val44 = std::max(val14,val44); val14 = tmp;
-      tmp = std::min(val15,val45); val45 = std::max(val15,val45); val15 = tmp; tmp = std::min(val18,val48);
-      val48 = std::max(val18,val48); val18 = tmp; tmp = std::min(val2,val16); val16 = std::max(val2,val16);
-      val2 = tmp; tmp = std::min(val3,val17); val17 = std::max(val3,val17); val3 = tmp;
-      tmp = std::min(val6,val20); val20 = std::max(val6,val20); val6 = tmp; tmp = std::min(val7,val21);
-      val21 = std::max(val7,val21); val7 = tmp; tmp = std::min(val10,val24); val24 = std::max(val10,val24);
-      val10 = tmp; tmp = std::min(val11,val25); val25 = std::max(val11,val25); val11 = tmp;
-      tmp = std::min(val14,val28); val28 = std::max(val14,val28); val14 = tmp; tmp = std::min(val15,val29);
-      val29 = std::max(val15,val29); val15 = tmp; tmp = std::min(val18,val32); val32 = std::max(val18,val32);
-      val18 = tmp; tmp = std::min(val19,val33); val33 = std::max(val19,val33); val19 = tmp;
-      tmp = std::min(val22,val36); val36 = std::max(val22,val36); val22 = tmp; tmp = std::min(val23,val37);
-      val37 = std::max(val23,val37); val23 = tmp; tmp = std::min(val26,val40); val40 = std::max(val26,val40);
-      val26 = tmp; tmp = std::min(val27,val41); val41 = std::max(val27,val41); val27 = tmp;
-      tmp = std::min(val30,val44); val44 = std::max(val30,val44); val30 = tmp; tmp = std::min(val31,val45);
-      val45 = std::max(val31,val45); val31 = tmp; tmp = std::min(val34,val48); val48 = std::max(val34,val48);
-      val34 = tmp; tmp = std::min(val2,val8); val8 = std::max(val2,val8); val2 = tmp; tmp = std::min(val3,val9);
-      val9 = std::max(val3,val9); val3 = tmp; tmp = std::min(val6,val12); val12 = std::max(val6,val12); val6 = tmp;
-      tmp = std::min(val7,val13); val13 = std::max(val7,val13); val7 = tmp; tmp = std::min(val10,val16);
-      val16 = std::max(val10,val16); val10 = tmp; tmp = std::min(val11,val17); val17 = std::max(val11,val17);
-      val11 = tmp; tmp = std::min(val14,val20); val20 = std::max(val14,val20); val14 = tmp;
-      tmp = std::min(val15,val21); val21 = std::max(val15,val21); val15 = tmp; tmp = std::min(val18,val24);
-      val24 = std::max(val18,val24); val18 = tmp; tmp = std::min(val19,val25); val25 = std::max(val19,val25);
-      val19 = tmp; tmp = std::min(val22,val28); val28 = std::max(val22,val28); val22 = tmp;
-      tmp = std::min(val23,val29); val29 = std::max(val23,val29); val23 = tmp; tmp = std::min(val26,val32);
-      val32 = std::max(val26,val32); val26 = tmp; tmp = std::min(val27,val33); val33 = std::max(val27,val33);
-      val27 = tmp; tmp = std::min(val30,val36); val36 = std::max(val30,val36); val30 = tmp;
-      tmp = std::min(val31,val37); val37 = std::max(val31,val37); val31 = tmp; tmp = std::min(val34,val40);
-      val40 = std::max(val34,val40); val34 = tmp; tmp = std::min(val35,val41); val41 = std::max(val35,val41);
-      val35 = tmp; tmp = std::min(val38,val44); val44 = std::max(val38,val44); val38 = tmp;
-      tmp = std::min(val39,val45); val45 = std::max(val39,val45); val39 = tmp; tmp = std::min(val42,val48);
-      val48 = std::max(val42,val48); val42 = tmp; tmp = std::min(val2,val4); val4 = std::max(val2,val4);
-      val2 = tmp; tmp = std::min(val3,val5); val5 = std::max(val3,val5); val3 = tmp; tmp = std::min(val6,val8);
-      val8 = std::max(val6,val8); val6 = tmp; tmp = std::min(val7,val9); val9 = std::max(val7,val9); val7 = tmp;
-      tmp = std::min(val10,val12); val12 = std::max(val10,val12); val10 = tmp; tmp = std::min(val11,val13);
-      val13 = std::max(val11,val13); val11 = tmp; tmp = std::min(val14,val16); val16 = std::max(val14,val16);
-      val14 = tmp; tmp = std::min(val15,val17); val17 = std::max(val15,val17); val15 = tmp;
-      tmp = std::min(val18,val20); val20 = std::max(val18,val20); val18 = tmp; tmp = std::min(val19,val21);
-      val21 = std::max(val19,val21); val19 = tmp; tmp = std::min(val22,val24); val24 = std::max(val22,val24);
-      val22 = tmp; tmp = std::min(val23,val25); val25 = std::max(val23,val25); val23 = tmp;
-      tmp = std::min(val26,val28); val28 = std::max(val26,val28); val26 = tmp; tmp = std::min(val27,val29);
-      val29 = std::max(val27,val29); val27 = tmp; tmp = std::min(val30,val32); val32 = std::max(val30,val32);
-      val30 = tmp; tmp = std::min(val31,val33); val33 = std::max(val31,val33); val31 = tmp;
-      tmp = std::min(val34,val36); val36 = std::max(val34,val36); val34 = tmp; tmp = std::min(val35,val37);
-      val37 = std::max(val35,val37); val35 = tmp; tmp = std::min(val38,val40); val40 = std::max(val38,val40);
-      val38 = tmp; tmp = std::min(val39,val41); val41 = std::max(val39,val41); val39 = tmp;
-      tmp = std::min(val42,val44); val44 = std::max(val42,val44); val42 = tmp; tmp = std::min(val43,val45);
-      val45 = std::max(val43,val45); val43 = tmp; tmp = std::min(val46,val48); val48 = std::max(val46,val48);
-      val46 = tmp; val1 = std::max(val0,val1); val3 = std::max(val2,val3); val5 = std::max(val4,val5);
-      val7 = std::max(val6,val7); val9 = std::max(val8,val9); val11 = std::max(val10,val11);
-      val13 = std::max(val12,val13); val15 = std::max(val14,val15); val17 = std::max(val16,val17);
-      val19 = std::max(val18,val19); val21 = std::max(val20,val21); val23 = std::max(val22,val23);
-      val24 = std::min(val24,val25); val26 = std::min(val26,val27); val28 = std::min(val28,val29);
-      val30 = std::min(val30,val31); val32 = std::min(val32,val33); val34 = std::min(val34,val35);
-      val36 = std::min(val36,val37); val38 = std::min(val38,val39); val40 = std::min(val40,val41);
-      val42 = std::min(val42,val43); val44 = std::min(val44,val45); val46 = std::min(val46,val47);
-      val32 = std::max(val1,val32); val34 = std::max(val3,val34); val36 = std::max(val5,val36);
-      val38 = std::max(val7,val38); val9 = std::min(val9,val40); val11 = std::min(val11,val42);
-      val13 = std::min(val13,val44); val15 = std::min(val15,val46); val17 = std::min(val17,val48);
-      val24 = std::max(val9,val24); val26 = std::max(val11,val26); val28 = std::max(val13,val28);
-      val30 = std::max(val15,val30); val17 = std::min(val17,val32); val19 = std::min(val19,val34);
-      val21 = std::min(val21,val36); val23 = std::min(val23,val38); val24 = std::max(val17,val24);
-      val26 = std::max(val19,val26); val21 = std::min(val21,val28); val23 = std::min(val23,val30);
-      val24 = std::max(val21,val24); val23 = std::min(val23,val26);
-      return std::max(val23,val24);
-    }
-
-    //! Return sqrt(x^2 + y^2).
-    template<typename T>
-    inline T hypot(const T x, const T y) {
-      return std::sqrt(x*x + y*y);
-    }
-
-    template<typename T>
-    inline T hypot(const T x, const T y, const T z) {
-      return std::sqrt(x*x + y*y + z*z);
-    }
-
-    template<typename T>
-    inline T _hypot(const T x, const T y) { // Slower but more precise version
-      T nx = cimg::abs(x), ny = cimg::abs(y), t;
-      if (nx<ny) { t = nx; nx = ny; } else t = ny;
-      if (nx>0) { t/=nx; return nx*std::sqrt(1 + t*t); }
-      return 0;
-    }
-
-    //! Return the factorial of n
-    inline double factorial(const int n) {
-      if (n<0) return cimg::type<double>::nan();
-      if (n<2) return 1;
-      double res = 2;
-      for (int i = 3; i<=n; ++i) res*=i;
-      return res;
-    }
-
-    //! Return the number of permutations of k objects in a set of n objects.
-    inline double permutations(const int k, const int n, const bool with_order) {
-      if (n<0 || k<0) return cimg::type<double>::nan();
-      if (k>n) return 0;
-      double res = 1;
-      for (int i = n; i>=n - k + 1; --i) res*=i;
-      return with_order?res:res/cimg::factorial(k);
-    }
-
-    inline double _fibonacci(int exp) {
-      double
-        base = (1 + std::sqrt(5.0))/2,
-        result = 1/std::sqrt(5.0);
-      while (exp) {
-        if (exp&1) result*=base;
-        exp>>=1;
-        base*=base;
-      }
-      return result;
-    }
-
-    //! Calculate fibonacci number.
-    // (Precise up to n = 78, less precise for n>78).
-    inline double fibonacci(const int n) {
-      if (n<0) return cimg::type<double>::nan();
-      if (n<3) return 1;
-      if (n<11) {
-        cimg_uint64 fn1 = 1, fn2 = 1, fn = 0;
-        for (int i = 3; i<=n; ++i) { fn = fn1 + fn2; fn2 = fn1; fn1 = fn; }
-        return (double)fn;
-      }
-      if (n<75) // precise up to n = 74, faster than the integer calculation above for n>10
-        return (double)((cimg_uint64)(_fibonacci(n) + 0.5));
-
-      if (n<94) { // precise up to n = 78, less precise for n>78 up to n = 93, overflows for n>93
-        cimg_uint64
-          fn1 = (cimg_uint64)1304969544928657U,
-          fn2 = (cimg_uint64)806515533049393U,
-          fn = 0;
-        for (int i = 75; i<=n; ++i) { fn = fn1 + fn2; fn2 = fn1; fn1 = fn; }
-        return (double)fn;
-      }
-      return _fibonacci(n); // Not precise, but better than the wrong overflowing calculation
-    }
-
-    //! Convert ascii character to lower case.
-    inline char lowercase(const char x) {
-      return (char)((x<'A'||x>'Z')?x:x - 'A' + 'a');
-    }
-    inline double lowercase(const double x) {
-      return (double)((x<'A'||x>'Z')?x:x - 'A' + 'a');
-    }
-
-    //! Convert C-string to lower case.
-    inline void lowercase(char *const str) {
-      if (str) for (char *ptr = str; *ptr; ++ptr) *ptr = lowercase(*ptr);
-    }
-
-    //! Convert ascii character to upper case.
-    inline char uppercase(const char x) {
-      return (char)((x<'a'||x>'z')?x:x - 'a' + 'A');
-    }
-
-    inline double uppercase(const double x) {
-      return (double)((x<'a'||x>'z')?x:x - 'a' + 'A');
-    }
-
-    //! Convert C-string to upper case.
-    inline void uppercase(char *const str) {
-      if (str) for (char *ptr = str; *ptr; ++ptr) *ptr = uppercase(*ptr);
-    }
-
-    //! Read value in a C-string.
-    /**
-       \param str C-string containing the float value to read.
-       \return Read value.
-       \note Same as <tt>std::atof()</tt> extended to manage the retrieval of fractions from C-strings,
-       as in <em>"1/2"</em>.
-    **/
-    inline double atof(const char *const str) {
-      double x = 0, y = 1;
-      return str && cimg_sscanf(str,"%lf/%lf",&x,&y)>0?x/y:0;
-    }
-
-    //! Compare the first \p l characters of two C-strings, ignoring the case.
-    /**
-       \param str1 C-string.
-       \param str2 C-string.
-       \param l Number of characters to compare.
-       \return \c 0 if the two strings are equal, something else otherwise.
-       \note This function has to be defined since it is not provided by all C++-compilers (not ANSI).
-    **/
-    inline int strncasecmp(const char *const str1, const char *const str2, const int l) {
-      if (!l) return 0;
-      if (!str1) return str2?-1:0;
-      const char *nstr1 = str1, *nstr2 = str2;
-      int k, diff = 0; for (k = 0; k<l && !(diff = lowercase(*nstr1) - lowercase(*nstr2)); ++k) { ++nstr1; ++nstr2; }
-      return k!=l?diff:0;
-    }
-
-    //! Compare two C-strings, ignoring the case.
-    /**
-       \param str1 C-string.
-       \param str2 C-string.
-       \return \c 0 if the two strings are equal, something else otherwise.
-       \note This function has to be defined since it is not provided by all C++-compilers (not ANSI).
-    **/
-    inline int strcasecmp(const char *const str1, const char *const str2) {
-      if (!str1) return str2?-1:0;
-      const int
-        l1 = (int)std::strlen(str1),
-        l2 = (int)std::strlen(str2);
-      return cimg::strncasecmp(str1,str2,1 + (l1<l2?l1:l2));
-    }
-
-    //! Ellipsize a string.
-    /**
-       \param str C-string.
-       \param l Max number of characters.
-       \param is_ending Tell if the dots are placed at the end or at the center of the ellipsized string.
-    **/
-    inline char *strellipsize(char *const str, const unsigned int l=64,
-                              const bool is_ending=true) {
-      if (!str) return str;
-      const unsigned int nl = l<5?5:l, ls = (unsigned int)std::strlen(str);
-      if (ls<=nl) return str;
-      if (is_ending) std::strcpy(str + nl - 5,"(...)");
-      else {
-        const unsigned int ll = (nl - 5)/2 + 1 - (nl%2), lr = nl - ll - 5;
-        std::strcpy(str + ll,"(...)");
-        std::memmove(str + ll + 5,str + ls - lr,lr);
-      }
-      str[nl] = 0;
-      return str;
-    }
-
-    //! Ellipsize a string.
-    /**
-       \param str C-string.
-       \param res output C-string.
-       \param l Max number of characters.
-       \param is_ending Tell if the dots are placed at the end or at the center of the ellipsized string.
-    **/
-    inline char *strellipsize(const char *const str, char *const res, const unsigned int l=64,
-                              const bool is_ending=true) {
-      const unsigned int nl = l<5?5:l, ls = (unsigned int)std::strlen(str);
-      if (ls<=nl) { std::strcpy(res,str); return res; }
-      if (is_ending) {
-        std::strncpy(res,str,nl - 5);
-        std::strcpy(res + nl -5,"(...)");
-      } else {
-        const unsigned int ll = (nl - 5)/2 + 1 - (nl%2), lr = nl - ll - 5;
-        std::strncpy(res,str,ll);
-        std::strcpy(res + ll,"(...)");
-        std::strncpy(res + ll + 5,str + ls - lr,lr);
-      }
-      res[nl] = 0;
-      return res;
-    }
-
-    //! Remove delimiters on the start and/or end of a C-string.
-    /**
-       \param[in,out] str C-string to work with (modified at output).
-       \param delimiter Delimiter character code to remove.
-       \param is_symmetric Tells if the removal is done only if delimiters are symmetric
-       (both at the beginning and the end of \c s).
-       \param is_iterative Tells if the removal is done if several iterations are possible.
-       \return \c true if delimiters have been removed, \c false otherwise.
-   **/
-    inline bool strpare(char *const str, const char delimiter,
-                        const bool is_symmetric, const bool is_iterative) {
-      if (!str) return false;
-      const int l = (int)std::strlen(str);
-      int p, q;
-      if (is_symmetric) for (p = 0, q = l - 1; p<q && str[p]==delimiter && str[q]==delimiter; ) {
-          --q; ++p; if (!is_iterative) break;
-        } else {
-        for (p = 0; p<l && str[p]==delimiter; ) { ++p; if (!is_iterative) break; }
-        for (q = l - 1; q>p && str[q]==delimiter; ) { --q; if (!is_iterative) break; }
-      }
-      const int n = q - p + 1;
-      if (n!=l) { std::memmove(str,str + p,(unsigned int)n); str[n] = 0; return true; }
-      return false;
-    }
-
-    //! Remove white spaces on the start and/or end of a C-string.
-    inline bool strpare(char *const str, const bool is_symmetric, const bool is_iterative) {
-      if (!str) return false;
-      const int l = (int)std::strlen(str);
-      int p, q;
-      if (is_symmetric) for (p = 0, q = l - 1; p<q && (signed char)str[p]<=' ' && (signed char)str[q]<=' '; ) {
-          --q; ++p; if (!is_iterative) break;
-        } else {
-        for (p = 0; p<l && (signed char)str[p]<=' '; ) { ++p; if (!is_iterative) break; }
-        for (q = l - 1; q>p && (signed char)str[q]<=' '; ) { --q; if (!is_iterative) break; }
-      }
-      const int n = q - p + 1;
-      if (n!=l) { std::memmove(str,str + p,(unsigned int)n); str[n] = 0; return true; }
-      return false;
-    }
-
-    //! Replace reserved characters (for Windows filename) by another character.
-    /**
-       \param[in,out] str C-string to work with (modified at output).
-       \param[in] c Replacement character.
-    **/
-    inline void strwindows_reserved(char *const str, const char c='_') {
-      for (char *s = str; *s; ++s) {
-        const char i = *s;
-        if (i=='<' || i=='>' || i==':' || i=='\"' || i=='/' || i=='\\' || i=='|' || i=='?' || i=='*') *s = c;
-      }
-    }
-
-    //! Replace escape sequences in C-strings by their binary ascii values.
-    /**
-       \param[in,out] str C-string to work with (modified at output).
-    **/
-    inline void strunescape(char *const str) {
-#define cimg_strunescape(ci,co) case ci : *nd = co; ++ns; break;
-      unsigned int val = 0;
-      for (char *ns = str, *nd = str; *ns || (bool)(*nd=0); ++nd) if (*ns=='\\') switch (*(++ns)) {
-            cimg_strunescape('a','\a');
-            cimg_strunescape('b','\b');
-            cimg_strunescape('e',0x1B);
-            cimg_strunescape('f','\f');
-            cimg_strunescape('n','\n');
-            cimg_strunescape('r','\r');
-            cimg_strunescape('t','\t');
-            cimg_strunescape('v','\v');
-            cimg_strunescape('\\','\\');
-            cimg_strunescape('\'','\'');
-            cimg_strunescape('\"','\"');
-            cimg_strunescape('\?','\?');
-          case 0 : *nd = 0; break;
-          case '0' : case '1' : case '2' : case '3' : case '4' : case '5' : case '6' : case '7' :
-            cimg_sscanf(ns,"%o",&val); while (*ns>='0' && *ns<='7') ++ns;
-            *nd = (char)val; break;
-          case 'x' :
-            cimg_sscanf(++ns,"%x",&val);
-            while ((*ns>='0' && *ns<='9') || (*ns>='a' && *ns<='f') || (*ns>='A' && *ns<='F')) ++ns;
-            *nd = (char)val; break;
-          default : *nd = *(ns++);
-          } else *nd = *(ns++);
-    }
-
-    // Return a temporary string describing the size of a memory buffer.
-    inline const char *strbuffersize(const cimg_ulong size);
-
-    // Return string that identifies the running OS.
-    inline const char *stros() {
-#if defined(linux) || defined(__linux) || defined(__linux__)
-      static const char *const str = "Linux";
-#elif defined(sun) || defined(__sun)
-      static const char *const str = "Sun OS";
-#elif defined(BSD) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined (__DragonFly__)
-      static const char *const str = "BSD";
-#elif defined(sgi) || defined(__sgi)
-      static const char *const str = "Irix";
-#elif defined(__MACOSX__) || defined(__APPLE__)
-      static const char *const str = "Mac OS";
-#elif defined(unix) || defined(__unix) || defined(__unix__)
-      static const char *const str = "Generic Unix";
-#elif defined(_MSC_VER) || defined(WIN32)  || defined(_WIN32) || defined(__WIN32__) || \
-  defined(WIN64) || defined(_WIN64) || defined(__WIN64__)
-      static const char *const str = "Windows";
-#else
-      const char
-        *const _str1 = std::getenv("OSTYPE"),
-        *const _str2 = _str1?_str1:std::getenv("OS"),
-        *const str = _str2?_str2:"Unknown OS";
-#endif
-      return str;
-    }
-
-    //! Return the basename of a filename.
-    inline const char* basename(const char *const s, const char separator=cimg_file_separator)  {
-      const char *p = 0, *np = s;
-      while (np>=s && (p=np)) np = std::strchr(np,separator) + 1;
-      return p;
-    }
-
-    // Return a random filename.
-    inline const char* filenamerand() {
-      cimg::mutex(6);
-      static char randomid[9];
-      cimg::srand();
-      for (unsigned int k = 0; k<8; ++k) {
-        const int v = (int)cimg::rand(65535)%3;
-        randomid[k] = (char)(v==0?('0' + ((int)cimg::rand(65535)%10)):
-                             (v==1?('a' + ((int)cimg::rand(65535)%26)):
-                              ('A' + ((int)cimg::rand(65535)%26))));
-      }
-      cimg::mutex(6,0);
-      return randomid;
-    }
-
-    // Convert filename as a Windows-style filename (short path name).
-    inline void winformat_string(char *const str) {
-      if (str && *str) {
-#if cimg_OS==2
-        char *const nstr = new char[MAX_PATH];
-        if (GetShortPathNameA(str,nstr,MAX_PATH)) std::strcpy(str,nstr);
-        delete[] nstr;
-#endif
-      }
-    }
-
-    // Open a file (with wide character support on Windows).
-    inline std::FILE *win_fopen(const char *const path, const char *const mode);
-
-    //! Open a file.
-    /**
-       \param path Path of the filename to open.
-       \param mode C-string describing the opening mode.
-       \return Opened file.
-       \note Same as <tt>std::fopen()</tt> but throw a \c CImgIOException when
-       the specified file cannot be opened, instead of returning \c 0.
-    **/
-    inline std::FILE *fopen(const char *const path, const char *const mode) {
-      if (!path)
-        throw CImgArgumentException("cimg::fopen(): Specified file path is (null).");
-      if (!mode)
-        throw CImgArgumentException("cimg::fopen(): File '%s', specified mode is (null).",
-                                    path);
-      std::FILE *res = 0;
-      if (*path=='-' && (!path[1] || path[1]=='.')) {
-        res = (*mode=='r')?cimg::_stdin():cimg::_stdout();
-#if cimg_OS==2
-        if (*mode && mode[1]=='b') { // Force stdin/stdout to be in binary mode.
-#ifdef __BORLANDC__
-          if (setmode(_fileno(res),0x8000)==-1) res = 0;
-#else
-          if (_setmode(_fileno(res),0x8000)==-1) res = 0;
-#endif
-        }
-#endif
-      } else res = std_fopen(path,mode);
-      if (!res) throw CImgIOException("cimg::fopen(): Failed to open file '%s' with mode '%s'.",
-                                      path,mode);
-      return res;
-    }
-
-    //! Close a file.
-    /**
-       \param file File to close.
-       \return \c 0 if file has been closed properly, something else otherwise.
-       \note Same as <tt>std::fclose()</tt> but display a warning message if
-       the file has not been closed properly.
-    **/
-    inline int fclose(std::FILE *file) {
-      if (!file) { warn("cimg::fclose(): Specified file is (null)."); return 0; }
-      if (file==cimg::_stdin(false) || file==cimg::_stdout(false)) return 0;
-      const int errn = std::fclose(file);
-      if (errn!=0) warn("cimg::fclose(): Error code %d returned during file closing.",
-                        errn);
-      return errn;
-    }
-
-    //! Version of 'fseek()' that supports >=64bits offsets everywhere (for Windows).
-    inline int fseek(FILE *stream, cimg_long offset, int origin) {
-#if cimg_OS==2
-      return _fseeki64(stream,(__int64)offset,origin);
-#else
-      return std::fseek(stream,offset,origin);
-#endif
-    }
-
-    //! Version of 'ftell()' that supports >=64bits offsets everywhere (for Windows).
-    inline cimg_long ftell(FILE *stream) {
-#if cimg_OS==2
-      return (cimg_long)_ftelli64(stream);
-#else
-      return (cimg_long)std::ftell(stream);
-#endif
-    }
-
-    //! Check if a path is a directory.
-    /**
-       \param path Specified path to test.
-    **/
-    inline bool is_directory(const char *const path) {
-      if (!path || !*path) return false;
-#if cimg_OS==1
-      struct stat st_buf;
-      return (!stat(path,&st_buf) && S_ISDIR(st_buf.st_mode));
-#elif cimg_OS==2
-      const unsigned int res = (unsigned int)GetFileAttributesA(path);
-      return res==INVALID_FILE_ATTRIBUTES?false:(res&16);
-#else
-      return false;
-#endif
-    }
-
-    //! Check if a path is a file.
-    /**
-       \param path Specified path to test.
-    **/
-    inline bool is_file(const char *const path) {
-      if (!path || !*path) return false;
-      std::FILE *const file = std_fopen(path,"rb");
-      if (!file) return false;
-      std::fclose(file);
-      return !is_directory(path);
-    }
-
-    //! Get last write time of a given file or directory.
-    /**
-       \param path Specified path to get attributes from.
-       \param attr Type of requested time attribute.
-                   Can be { 0=year | 1=month | 2=day | 3=day of week | 4=hour | 5=minute | 6=second }
-       \return -1 if requested attribute could not be read.
-    **/
-    inline int fdate(const char *const path, const unsigned int attr) {
-      int res = -1;
-      if (!path || !*path || attr>6) return -1;
-      cimg::mutex(6);
-#if cimg_OS==2
-      HANDLE file = CreateFileA(path,GENERIC_READ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
-      if (file!=INVALID_HANDLE_VALUE) {
-        FILETIME _ft;
-        SYSTEMTIME ft;
-        if (GetFileTime(file,0,0,&_ft) && FileTimeToSystemTime(&_ft,&ft))
-          res = (int)(attr==0?ft.wYear:attr==1?ft.wMonth:attr==2?ft.wDay:attr==3?ft.wDayOfWeek:
-                      attr==4?ft.wHour:attr==5?ft.wMinute:ft.wSecond);
-        CloseHandle(file);
-      }
-#elif cimg_OS==1
-      struct stat st_buf;
-      if (!stat(path,&st_buf)) {
-        const time_t _ft = st_buf.st_mtime;
-        const struct tm& ft = *std::localtime(&_ft);
-        res = (int)(attr==0?ft.tm_year + 1900:attr==1?ft.tm_mon + 1:attr==2?ft.tm_mday:attr==3?ft.tm_wday:
-                    attr==4?ft.tm_hour:attr==5?ft.tm_min:ft.tm_sec);
-      }
-#endif
-      cimg::mutex(6,0);
-      return res;
-    }
-
-    //! Get current local time.
-    /**
-       \param attr Type of requested time attribute.
-                   Can be { 0=year | 1=month | 2=day | 3=day of week | 4=hour | 5=minute | 6=second }
-    **/
-    inline int date(const unsigned int attr) {
-      int res;
-      cimg::mutex(6);
-#if cimg_OS==2
-      SYSTEMTIME st;
-      GetLocalTime(&st);
-      res = (int)(attr==0?st.wYear:attr==1?st.wMonth:attr==2?st.wDay:attr==3?st.wDayOfWeek:
-                  attr==4?st.wHour:attr==5?st.wMinute:st.wSecond);
-#else
-      time_t _st;
-      std::time(&_st);
-      struct tm *st = std::localtime(&_st);
-      res = (int)(attr==0?st->tm_year + 1900:attr==1?st->tm_mon + 1:attr==2?st->tm_mday:attr==3?st->tm_wday:
-                  attr==4?st->tm_hour:attr==5?st->tm_min:st->tm_sec);
-#endif
-      cimg::mutex(6,0);
-      return res;
-    }
-
-    // Get/set path to store temporary files.
-    inline const char* temporary_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the <i>Program Files/</i> directory (Windows only).
-#if cimg_OS==2
-    inline const char* programfiles_path(const char *const user_path=0, const bool reinit_path=false);
-#endif
-
-    // Get/set path to the ImageMagick's \c convert binary.
-    inline const char* imagemagick_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the GraphicsMagick's \c gm binary.
-    inline const char* graphicsmagick_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the XMedcon's \c medcon binary.
-    inline const char* medcon_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the FFMPEG's \c ffmpeg binary.
-    inline const char *ffmpeg_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the \c gzip binary.
-    inline const char *gzip_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the \c gunzip binary.
-    inline const char *gunzip_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the \c dcraw binary.
-    inline const char *dcraw_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the \c wget binary.
-    inline const char *wget_path(const char *const user_path=0, const bool reinit_path=false);
-
-    // Get/set path to the \c curl binary.
-    inline const char *curl_path(const char *const user_path=0, const bool reinit_path=false);
-
-    //! Split filename into two C-strings \c body and \c extension.
-    /**
-       filename and body must not overlap!
-    **/
-    inline const char *split_filename(const char *const filename, char *const body=0) {
-      if (!filename) { if (body) *body = 0; return 0; }
-      const char *p = 0; for (const char *np = filename; np>=filename && (p=np); np = std::strchr(np,'.') + 1) {}
-      if (p==filename) {
-        if (body) std::strcpy(body,filename);
-        return filename + std::strlen(filename);
-      }
-      const unsigned int l = (unsigned int)(p - filename - 1);
-      if (body) { if (l) std::memcpy(body,filename,l); body[l] = 0; }
-      return p;
-    }
-
-    //! Generate a numbered version of a filename.
-    inline char* number_filename(const char *const filename, const int number,
-                                 const unsigned int digits, char *const str) {
-      if (!filename) { if (str) *str = 0; return 0; }
-      char *const format = new char[1024], *const body = new char[1024];
-      const char *const ext = cimg::split_filename(filename,body);
-      if (*ext) cimg_snprintf(format,1024,"%%s_%%.%ud.%%s",digits);
-      else cimg_snprintf(format,1024,"%%s_%%.%ud",digits);
-      cimg_sprintf(str,format,body,number,ext);
-      delete[] format; delete[] body;
-      return str;
-    }
-
-    //! Read data from file.
-    /**
-       \param[out] ptr Pointer to memory buffer that will contain the binary data read from file.
-       \param nmemb Number of elements to read.
-       \param stream File to read data from.
-       \return Number of read elements.
-       \note Same as <tt>std::fread()</tt> but may display warning message if all elements could not be read.
-    **/
-    template<typename T>
-    inline size_t fread(T *const ptr, const size_t nmemb, std::FILE *stream) {
-      if (!ptr || !stream)
-        throw CImgArgumentException("cimg::fread(): Invalid reading request of %u %s%s from file %p to buffer %p.",
-                                    nmemb,cimg::type<T>::string(),nmemb>1?"s":"",stream,ptr);
-      if (!nmemb) return 0;
-      const size_t wlimitT = 63*1024*1024, wlimit = wlimitT/sizeof(T);
-      size_t to_read = nmemb, al_read = 0, l_to_read = 0, l_al_read = 0;
-      do {
-        l_to_read = (to_read*sizeof(T))<wlimitT?to_read:wlimit;
-        l_al_read = std::fread((void*)(ptr + al_read),sizeof(T),l_to_read,stream);
-        al_read+=l_al_read;
-        to_read-=l_al_read;
-      } while (l_to_read==l_al_read && to_read>0);
-      if (to_read>0)
-        warn("cimg::fread(): Only %lu/%lu elements could be read from file.",
-             (unsigned long)al_read,(unsigned long)nmemb);
-      return al_read;
-    }
-
-    //! Write data to file.
-    /**
-       \param ptr Pointer to memory buffer containing the binary data to write on file.
-       \param nmemb Number of elements to write.
-       \param[out] stream File to write data on.
-       \return Number of written elements.
-       \note Similar to <tt>std::fwrite</tt> but may display warning messages if all elements could not be written.
-    **/
-    template<typename T>
-    inline size_t fwrite(const T *ptr, const size_t nmemb, std::FILE *stream) {
-      if (!ptr || !stream)
-        throw CImgArgumentException("cimg::fwrite(): Invalid writing request of %u %s%s from buffer %p to file %p.",
-                                    nmemb,cimg::type<T>::string(),nmemb>1?"s":"",ptr,stream);
-      if (!nmemb) return 0;
-      const size_t wlimitT = 63*1024*1024, wlimit = wlimitT/sizeof(T);
-      size_t to_write = nmemb, al_write = 0, l_to_write = 0, l_al_write = 0;
-      do {
-        l_to_write = (to_write*sizeof(T))<wlimitT?to_write:wlimit;
-        l_al_write = std::fwrite((void*)(ptr + al_write),sizeof(T),l_to_write,stream);
-        al_write+=l_al_write;
-        to_write-=l_al_write;
-      } while (l_to_write==l_al_write && to_write>0);
-      if (to_write>0)
-        warn("cimg::fwrite(): Only %lu/%lu elements could be written in file.",
-             (unsigned long)al_write,(unsigned long)nmemb);
-      return al_write;
-    }
-
-    //! Create an empty file.
-    /**
-       \param file Input file (can be \c 0 if \c filename is set).
-       \param filename Filename, as a C-string (can be \c 0 if \c file is set).
-    **/
-    inline void fempty(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException("cimg::fempty(): Specified filename is (null).");
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      if (!file) cimg::fclose(nfile);
-    }
-
-    // Try to guess format from an image file.
-    inline const char *ftype(std::FILE *const file, const char *const filename);
-
-    // Load file from network as a local temporary file.
-    inline char *load_network(const char *const url, char *const filename_local,
-                              const unsigned int timeout=0, const bool try_fallback=false,
-                              const char *const referer=0);
-
-    //! Return options specified on the command line.
-    inline const char* option(const char *const name, const int argc, const char *const *const argv,
-                              const char *const defaut, const char *const usage, const bool reset_static) {
-      static bool first = true, visu = false;
-      if (reset_static) { first = true; return 0; }
-      const char *res = 0;
-      if (first) {
-        first = false;
-        visu = cimg::option("-h",argc,argv,(char*)0,(char*)0,false)!=0;
-        visu |= cimg::option("-help",argc,argv,(char*)0,(char*)0,false)!=0;
-        visu |= cimg::option("--help",argc,argv,(char*)0,(char*)0,false)!=0;
-      }
-      if (!name && visu) {
-        if (usage) {
-          std::fprintf(cimg::output(),"\n %s%s%s",cimg::t_red,cimg::basename(argv[0]),cimg::t_normal);
-          std::fprintf(cimg::output(),": %s",usage);
-          std::fprintf(cimg::output()," (%s, %s)\n\n",cimg_date,cimg_time);
-        }
-        if (defaut) std::fprintf(cimg::output(),"%s\n",defaut);
-      }
-      if (name) {
-        if (argc>0) {
-          int k = 0;
-          while (k<argc && std::strcmp(argv[k],name)) ++k;
-          res = (k++==argc?defaut:(k==argc?argv[--k]:argv[k]));
-        } else res = defaut;
-        if (visu && usage) std::fprintf(cimg::output(),"    %s%-16s%s %-24s %s%s%s\n",
-                                        cimg::t_bold,name,cimg::t_normal,res?res:"0",
-                                        cimg::t_green,usage,cimg::t_normal);
-      }
-      return res;
-    }
-
-    inline const char* option(const char *const name, const int argc, const char *const *const argv,
-                              const char *const defaut, const char *const usage=0) {
-      return option(name,argc,argv,defaut,usage,false);
-    }
-
-    inline bool option(const char *const name, const int argc, const char *const *const argv,
-                       const bool defaut, const char *const usage=0) {
-      const char *const s = cimg::option(name,argc,argv,(char*)0);
-      const bool res = s?(cimg::strcasecmp(s,"false") && cimg::strcasecmp(s,"off") && cimg::strcasecmp(s,"0")):defaut;
-      cimg::option(name,0,0,res?"true":"false",usage);
-      return res;
-    }
-
-    inline int option(const char *const name, const int argc, const char *const *const argv,
-                      const int defaut, const char *const usage=0) {
-      const char *const s = cimg::option(name,argc,argv,(char*)0);
-      const int res = s?std::atoi(s):defaut;
-      char *const tmp = new char[256];
-      cimg_snprintf(tmp,256,"%d",res);
-      cimg::option(name,0,0,tmp,usage);
-      delete[] tmp;
-      return res;
-    }
-
-    inline char option(const char *const name, const int argc, const char *const *const argv,
-                       const char defaut, const char *const usage=0) {
-      const char *const s = cimg::option(name,argc,argv,(char*)0);
-      const char res = s?*s:defaut;
-      char tmp[8];
-      *tmp = res; tmp[1] = 0;
-      cimg::option(name,0,0,tmp,usage);
-      return res;
-    }
-
-    inline float option(const char *const name, const int argc, const char *const *const argv,
-                        const float defaut, const char *const usage=0) {
-      const char *const s = cimg::option(name,argc,argv,(char*)0);
-      const float res = s?(float)cimg::atof(s):defaut;
-      char *const tmp = new char[256];
-      cimg_snprintf(tmp,256,"%g",res);
-      cimg::option(name,0,0,tmp,usage);
-      delete[] tmp;
-      return res;
-    }
-
-    inline double option(const char *const name, const int argc, const char *const *const argv,
-                         const double defaut, const char *const usage=0) {
-      const char *const s = cimg::option(name,argc,argv,(char*)0);
-      const double res = s?cimg::atof(s):defaut;
-      char *const tmp = new char[256];
-      cimg_snprintf(tmp,256,"%g",res);
-      cimg::option(name,0,0,tmp,usage);
-      delete[] tmp;
-      return res;
-    }
-
-    //! Print information about \CImg environement variables.
-    /**
-       \note Output is done on the default output stream.
-    **/
-    inline void info() {
-      std::fprintf(cimg::output(),"\n %s%sCImg Library %u.%u.%u%s, compiled %s ( %s ) with the following flags:\n\n",
-                   cimg::t_red,cimg::t_bold,cimg_version/100,(cimg_version/10)%10,cimg_version%10,
-                   cimg::t_normal,cimg_date,cimg_time);
-
-      std::fprintf(cimg::output(),"  > Operating System:       %s%-13s%s %s('cimg_OS'=%d)%s\n",
-                   cimg::t_bold,
-                   cimg_OS==1?"Unix":(cimg_OS==2?"Windows":"Unknow"),
-                   cimg::t_normal,cimg::t_green,
-                   cimg_OS,
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > CPU endianness:         %s%s Endian%s\n",
-                   cimg::t_bold,
-                   cimg::endianness()?"Big":"Little",
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Verbosity mode:         %s%-13s%s %s('cimg_verbosity'=%d)%s\n",
-                   cimg::t_bold,
-                   cimg_verbosity==0?"Quiet":
-                   cimg_verbosity==1?"Console":
-                   cimg_verbosity==2?"Dialog":
-                   cimg_verbosity==3?"Console+Warnings":"Dialog+Warnings",
-                   cimg::t_normal,cimg::t_green,
-                   cimg_verbosity,
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Stricts warnings:       %s%-13s%s %s('cimg_strict_warnings' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_strict_warnings
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Support for C++11:      %s%-13s%s %s('cimg_use_cpp11'=%d)%s\n",
-                   cimg::t_bold,
-                   cimg_use_cpp11?"Yes":"No",
-                   cimg::t_normal,cimg::t_green,
-                   (int)cimg_use_cpp11,
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using VT100 messages:   %s%-13s%s %s('cimg_use_vt100' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_vt100
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Display type:           %s%-13s%s %s('cimg_display'=%d)%s\n",
-                   cimg::t_bold,
-                   cimg_display==0?"No display":cimg_display==1?"X11":cimg_display==2?"Windows GDI":"Unknown",
-                   cimg::t_normal,cimg::t_green,
-                   (int)cimg_display,
-                   cimg::t_normal);
-
-#if cimg_display==1
-      std::fprintf(cimg::output(),"  > Using XShm for X11:     %s%-13s%s %s('cimg_use_xshm' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_xshm
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using XRand for X11:    %s%-13s%s %s('cimg_use_xrandr' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_xrandr
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-#endif
-      std::fprintf(cimg::output(),"  > Using OpenMP:           %s%-13s%s %s('cimg_use_openmp' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_openmp
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-      std::fprintf(cimg::output(),"  > Using PNG library:      %s%-13s%s %s('cimg_use_png' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_png
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-      std::fprintf(cimg::output(),"  > Using JPEG library:     %s%-13s%s %s('cimg_use_jpeg' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_jpeg
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using TIFF library:     %s%-13s%s %s('cimg_use_tiff' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_tiff
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using Magick++ library: %s%-13s%s %s('cimg_use_magick' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_magick
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using FFTW3 library:    %s%-13s%s %s('cimg_use_fftw3' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_fftw3
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"  > Using LAPACK library:   %s%-13s%s %s('cimg_use_lapack' %s)%s\n",
-                   cimg::t_bold,
-#ifdef cimg_use_lapack
-                   "Yes",cimg::t_normal,cimg::t_green,"defined",
-#else
-                   "No",cimg::t_normal,cimg::t_green,"undefined",
-#endif
-                   cimg::t_normal);
-
-      char *const tmp = new char[1024];
-      cimg_snprintf(tmp,1024,"\"%.1020s\"",cimg::imagemagick_path());
-      std::fprintf(cimg::output(),"  > Path of ImageMagick:    %s%-13s%s\n",
-                   cimg::t_bold,
-                   tmp,
-                   cimg::t_normal);
-
-      cimg_snprintf(tmp,1024,"\"%.1020s\"",cimg::graphicsmagick_path());
-      std::fprintf(cimg::output(),"  > Path of GraphicsMagick: %s%-13s%s\n",
-                   cimg::t_bold,
-                   tmp,
-                   cimg::t_normal);
-
-      cimg_snprintf(tmp,1024,"\"%.1020s\"",cimg::medcon_path());
-      std::fprintf(cimg::output(),"  > Path of 'medcon':       %s%-13s%s\n",
-                   cimg::t_bold,
-                   tmp,
-                   cimg::t_normal);
-
-      cimg_snprintf(tmp,1024,"\"%.1020s\"",cimg::temporary_path());
-      std::fprintf(cimg::output(),"  > Temporary path:         %s%-13s%s\n",
-                   cimg::t_bold,
-                   tmp,
-                   cimg::t_normal);
-
-      std::fprintf(cimg::output(),"\n");
-      delete[] tmp;
-    }
-
-    // Declare LAPACK function signatures if LAPACK support is enabled.
-#ifdef cimg_use_lapack
-    template<typename T>
-    inline void getrf(int &N, T *lapA, int *IPIV, int &INFO) {
-      dgetrf_(&N,&N,lapA,&N,IPIV,&INFO);
-    }
-
-    inline void getrf(int &N, float *lapA, int *IPIV, int &INFO) {
-      sgetrf_(&N,&N,lapA,&N,IPIV,&INFO);
-    }
-
-    template<typename T>
-    inline void getri(int &N, T *lapA, int *IPIV, T* WORK, int &LWORK, int &INFO) {
-      dgetri_(&N,lapA,&N,IPIV,WORK,&LWORK,&INFO);
-    }
-
-    inline void getri(int &N, float *lapA, int *IPIV, float* WORK, int &LWORK, int &INFO) {
-      sgetri_(&N,lapA,&N,IPIV,WORK,&LWORK,&INFO);
-    }
-
-    template<typename T>
-    inline void gesvd(char &JOB, int &M, int &N, T *lapA, int &MN,
-                      T *lapS, T *lapU, T *lapV, T *WORK, int &LWORK, int &INFO) {
-      dgesvd_(&JOB,&JOB,&M,&N,lapA,&MN,lapS,lapU,&M,lapV,&N,WORK,&LWORK,&INFO);
-    }
-
-    inline void gesvd(char &JOB, int &M, int &N, float *lapA, int &MN,
-                      float *lapS, float *lapU, float *lapV, float *WORK, int &LWORK, int &INFO) {
-      sgesvd_(&JOB,&JOB,&M,&N,lapA,&MN,lapS,lapU,&M,lapV,&N,WORK,&LWORK,&INFO);
-    }
-
-    template<typename T>
-    inline void getrs(char &TRANS, int &N, T *lapA, int *IPIV, T *lapB, int &INFO) {
-      int one = 1;
-      dgetrs_(&TRANS,&N,&one,lapA,&N,IPIV,lapB,&N,&INFO);
-    }
-
-    inline void getrs(char &TRANS, int &N, float *lapA, int *IPIV, float *lapB, int &INFO) {
-      int one = 1;
-      sgetrs_(&TRANS,&N,&one,lapA,&N,IPIV,lapB,&N,&INFO);
-    }
-
-    template<typename T>
-    inline void syev(char &JOB, char &UPLO, int &N, T *lapA, T *lapW, T *WORK, int &LWORK, int &INFO) {
-      dsyev_(&JOB,&UPLO,&N,lapA,&N,lapW,WORK,&LWORK,&INFO);
-    }
-
-    inline void syev(char &JOB, char &UPLO, int &N, float *lapA, float *lapW, float *WORK, int &LWORK, int &INFO) {
-      ssyev_(&JOB,&UPLO,&N,lapA,&N,lapW,WORK,&LWORK,&INFO);
-    }
-
-    template<typename T>
-    inline void sgels(char & TRANS, int &M, int &N, int &NRHS, T* lapA, int &LDA,
-                      T* lapB, int &LDB, T* WORK, int &LWORK, int &INFO){
-      dgels_(&TRANS, &M, &N, &NRHS, lapA, &LDA, lapB, &LDB, WORK, &LWORK, &INFO);
-    }
-
-    inline void sgels(char & TRANS, int &M, int &N, int &NRHS, float* lapA, int &LDA,
-                      float* lapB, int &LDB, float* WORK, int &LWORK, int &INFO){
-      sgels_(&TRANS, &M, &N, &NRHS, lapA, &LDA, lapB, &LDB, WORK, &LWORK, &INFO);
-    }
-
-#endif
-
-    // End of the 'cimg' namespace
-  }
-
-  /*------------------------------------------------
-   #
-   #
-   #   Definition of mathematical operators and
-   #   external functions.
-   #
-   #
-   -------------------------------------------------*/
-
-#define _cimg_create_ext_operators(typ) \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator+(const typ val, const CImg<T>& img) { \
-    return img + val; \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator-(const typ val, const CImg<T>& img) { \
-    typedef typename cimg::superset<T,typ>::type Tt; \
-    return CImg<Tt>(img._width,img._height,img._depth,img._spectrum,val)-=img; \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator*(const typ val, const CImg<T>& img) { \
-    return img*val; \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator/(const typ val, const CImg<T>& img) { \
-    return val*img.get_invert(); \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator&(const typ val, const CImg<T>& img) { \
-    return img & val; \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator|(const typ val, const CImg<T>& img) { \
-    return img | val; \
-  } \
-  template<typename T> \
-  inline CImg<typename cimg::superset<T,typ>::type> operator^(const typ val, const CImg<T>& img) { \
-    return img ^ val; \
-  } \
-  template<typename T> \
-  inline bool operator==(const typ val, const CImg<T>& img) {   \
-    return img == val; \
-  } \
-  template<typename T> \
-  inline bool operator!=(const typ val, const CImg<T>& img) { \
-    return img != val; \
-  }
-
-  _cimg_create_ext_operators(bool)
-  _cimg_create_ext_operators(unsigned char)
-  _cimg_create_ext_operators(char)
-  _cimg_create_ext_operators(signed char)
-  _cimg_create_ext_operators(unsigned short)
-  _cimg_create_ext_operators(short)
-  _cimg_create_ext_operators(unsigned int)
-  _cimg_create_ext_operators(int)
-  _cimg_create_ext_operators(cimg_uint64)
-  _cimg_create_ext_operators(cimg_int64)
-  _cimg_create_ext_operators(float)
-  _cimg_create_ext_operators(double)
-  _cimg_create_ext_operators(long double)
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> operator+(const char *const expression, const CImg<T>& img) {
-    return img + expression;
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> operator-(const char *const expression, const CImg<T>& img) {
-    return CImg<_cimg_Tfloat>(img,false).fill(expression,true)-=img;
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> operator*(const char *const expression, const CImg<T>& img) {
-    return img*expression;
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> operator/(const char *const expression, const CImg<T>& img) {
-    return expression*img.get_invert();
-  }
-
-  template<typename T>
-  inline CImg<T> operator&(const char *const expression, const CImg<T>& img) {
-    return img & expression;
-  }
-
-  template<typename T>
-  inline CImg<T> operator|(const char *const expression, const CImg<T>& img) {
-    return img | expression;
-  }
-
-  template<typename T>
-  inline CImg<T> operator^(const char *const expression, const CImg<T>& img) {
-    return img ^ expression;
-  }
-
-  template<typename T>
-  inline bool operator==(const char *const expression, const CImg<T>& img) {
-    return img==expression;
-  }
-
-  template<typename T>
-  inline bool operator!=(const char *const expression, const CImg<T>& img) {
-    return img!=expression;
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sqr(const CImg<T>& instance) {
-    return instance.get_sqr();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sqrt(const CImg<T>& instance) {
-    return instance.get_sqrt();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> exp(const CImg<T>& instance) {
-    return instance.get_exp();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> log(const CImg<T>& instance) {
-    return instance.get_log();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> log2(const CImg<T>& instance) {
-    return instance.get_log2();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> log10(const CImg<T>& instance) {
-    return instance.get_log10();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> abs(const CImg<T>& instance) {
-    return instance.get_abs();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sign(const CImg<T>& instance) {
-    return instance.get_sign();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> cos(const CImg<T>& instance) {
-    return instance.get_cos();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sin(const CImg<T>& instance) {
-    return instance.get_sin();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sinc(const CImg<T>& instance) {
-    return instance.get_sinc();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> tan(const CImg<T>& instance) {
-    return instance.get_tan();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> acos(const CImg<T>& instance) {
-    return instance.get_acos();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> asin(const CImg<T>& instance) {
-    return instance.get_asin();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> atan(const CImg<T>& instance) {
-    return instance.get_atan();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> cosh(const CImg<T>& instance) {
-    return instance.get_cosh();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> sinh(const CImg<T>& instance) {
-    return instance.get_sinh();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> tanh(const CImg<T>& instance) {
-    return instance.get_tanh();
-  }
-
-  template<typename T>
-  inline CImg<T> transpose(const CImg<T>& instance) {
-    return instance.get_transpose();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> invert(const CImg<T>& instance) {
-    return instance.get_invert();
-  }
-
-  template<typename T>
-  inline CImg<_cimg_Tfloat> pseudoinvert(const CImg<T>& instance) {
-    return instance.get_pseudoinvert();
-  }
-
-  /*-----------------------------------
-   #
-   # Define the CImgDisplay structure
-   #
-   ----------------------------------*/
-  //! Allow the creation of windows, display images on them and manage user events (keyboard, mouse and windows events).
-  /**
-     CImgDisplay methods rely on a low-level graphic library to perform: it can be either \b X-Window
-     (X11, for Unix-based systems) or \b GDI32 (for Windows-based systems).
-     If both libraries are missing, CImgDisplay will not be able to display images on screen, and will enter
-     a minimal mode where warning messages will be outputed each time the program is trying to call one of the
-     CImgDisplay method.
-
-     The configuration variable \c cimg_display tells about the graphic library used.
-     It is set automatically by \CImg when one of these graphic libraries has been detected.
-     But, you can override its value if necessary. Valid choices are:
-     - 0: Disable display capabilities.
-     - 1: Use \b X-Window (X11) library.
-     - 2: Use \b GDI32 library.
-
-     Remember to link your program against \b X11 or \b GDI32 libraries if you use CImgDisplay.
-  **/
-  struct CImgDisplay {
-    cimg_ulong _timer, _fps_frames, _fps_timer;
-    unsigned int _width, _height, _normalization;
-    float _fps_fps, _min, _max;
-    bool _is_fullscreen;
-    char *_title;
-    unsigned int _window_width, _window_height, _button, *_keys, *_released_keys;
-    int _window_x, _window_y, _mouse_x, _mouse_y, _wheel;
-    bool _is_closed, _is_resized, _is_moved, _is_event,
-      _is_keyESC, _is_keyF1, _is_keyF2, _is_keyF3, _is_keyF4, _is_keyF5, _is_keyF6, _is_keyF7,
-      _is_keyF8, _is_keyF9, _is_keyF10, _is_keyF11, _is_keyF12, _is_keyPAUSE, _is_key1, _is_key2,
-      _is_key3, _is_key4, _is_key5, _is_key6, _is_key7, _is_key8, _is_key9, _is_key0,
-      _is_keyBACKSPACE, _is_keyINSERT, _is_keyHOME, _is_keyPAGEUP, _is_keyTAB, _is_keyQ, _is_keyW, _is_keyE,
-      _is_keyR, _is_keyT, _is_keyY, _is_keyU, _is_keyI, _is_keyO, _is_keyP, _is_keyDELETE,
-      _is_keyEND, _is_keyPAGEDOWN, _is_keyCAPSLOCK, _is_keyA, _is_keyS, _is_keyD, _is_keyF, _is_keyG,
-      _is_keyH, _is_keyJ, _is_keyK, _is_keyL, _is_keyENTER, _is_keySHIFTLEFT, _is_keyZ, _is_keyX,
-      _is_keyC, _is_keyV, _is_keyB, _is_keyN, _is_keyM, _is_keySHIFTRIGHT, _is_keyARROWUP, _is_keyCTRLLEFT,
-      _is_keyAPPLEFT, _is_keyALT, _is_keySPACE, _is_keyALTGR, _is_keyAPPRIGHT, _is_keyMENU, _is_keyCTRLRIGHT,
-      _is_keyARROWLEFT, _is_keyARROWDOWN, _is_keyARROWRIGHT, _is_keyPAD0, _is_keyPAD1, _is_keyPAD2, _is_keyPAD3,
-      _is_keyPAD4, _is_keyPAD5, _is_keyPAD6, _is_keyPAD7, _is_keyPAD8, _is_keyPAD9, _is_keyPADADD, _is_keyPADSUB,
-      _is_keyPADMUL, _is_keyPADDIV;
-
-    //@}
-    //---------------------------
-    //
-    //! \name Plugins
-    //@{
-    //---------------------------
-
-#ifdef cimgdisplay_plugin
-#include cimgdisplay_plugin
-#endif
-#ifdef cimgdisplay_plugin1
-#include cimgdisplay_plugin1
-#endif
-#ifdef cimgdisplay_plugin2
-#include cimgdisplay_plugin2
-#endif
-#ifdef cimgdisplay_plugin3
-#include cimgdisplay_plugin3
-#endif
-#ifdef cimgdisplay_plugin4
-#include cimgdisplay_plugin4
-#endif
-#ifdef cimgdisplay_plugin5
-#include cimgdisplay_plugin5
-#endif
-#ifdef cimgdisplay_plugin6
-#include cimgdisplay_plugin6
-#endif
-#ifdef cimgdisplay_plugin7
-#include cimgdisplay_plugin7
-#endif
-#ifdef cimgdisplay_plugin8
-#include cimgdisplay_plugin8
-#endif
-
-    //@}
-    //--------------------------------------------------------
-    //
-    //! \name Constructors / Destructor / Instance Management
-    //@{
-    //--------------------------------------------------------
-
-    //! Destructor.
-    /**
-       \note If the associated window is visible on the screen, it is closed by the call to the destructor.
-    **/
-    ~CImgDisplay() {
-      assign();
-      delete[] _keys;
-      delete[] _released_keys;
-    }
-
-    //! Construct an empty display.
-    /**
-       \note Constructing an empty CImgDisplay instance does not make a window appearing on the screen, until
-       display of valid data is performed.
-       \par Example
-       \code
-       CImgDisplay disp;  // Does actually nothing.
-       ...
-       disp.display(img); // Construct new window and display image in it.
-       \endcode
-    **/
-    CImgDisplay():
-      _width(0),_height(0),_normalization(0),
-      _min(0),_max(0),
-      _is_fullscreen(false),
-      _title(0),
-      _window_width(0),_window_height(0),_button(0),
-      _keys(new unsigned int[128]),_released_keys(new unsigned int[128]),
-      _window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),_wheel(0),
-      _is_closed(true),_is_resized(false),_is_moved(false),_is_event(false) {
-      assign();
-    }
-
-    //! Construct a display with specified dimensions.
-    /** \param width Window width.
-        \param height Window height.
-        \param title Window title.
-        \param normalization Normalization type
-        (<tt>0</tt>=none, <tt>1</tt>=always, <tt>2</tt>=once, <tt>3</tt>=pixel type-dependent, see normalization()).
-        \param is_fullscreen Tells if fullscreen mode is enabled.
-        \param is_closed Tells if associated window is initially visible or not.
-        \note A black background is initially displayed on the associated window.
-    **/
-    CImgDisplay(const unsigned int width, const unsigned int height,
-                const char *const title=0, const unsigned int normalization=3,
-                const bool is_fullscreen=false, const bool is_closed=false):
-      _width(0),_height(0),_normalization(0),
-      _min(0),_max(0),
-      _is_fullscreen(false),
-      _title(0),
-      _window_width(0),_window_height(0),_button(0),
-      _keys(new unsigned int[128]),_released_keys(new unsigned int[128]),
-      _window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),_wheel(0),
-      _is_closed(true),_is_resized(false),_is_moved(false),_is_event(false) {
-      assign(width,height,title,normalization,is_fullscreen,is_closed);
-    }
-
-    //! Construct a display from an image.
-    /** \param img Image used as a model to create the window.
-        \param title Window title.
-        \param normalization Normalization type
-        (<tt>0</tt>=none, <tt>1</tt>=always, <tt>2</tt>=once, <tt>3</tt>=pixel type-dependent, see normalization()).
-        \param is_fullscreen Tells if fullscreen mode is enabled.
-        \param is_closed Tells if associated window is initially visible or not.
-        \note The pixels of the input image are initially displayed on the associated window.
-    **/
-    template<typename T>
-    explicit CImgDisplay(const CImg<T>& img,
-                         const char *const title=0, const unsigned int normalization=3,
-                         const bool is_fullscreen=false, const bool is_closed=false):
-      _width(0),_height(0),_normalization(0),
-      _min(0),_max(0),
-      _is_fullscreen(false),
-      _title(0),
-      _window_width(0),_window_height(0),_button(0),
-      _keys(new unsigned int[128]),_released_keys(new unsigned int[128]),
-      _window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),_wheel(0),
-      _is_closed(true),_is_resized(false),_is_moved(false),_is_event(false) {
-      assign(img,title,normalization,is_fullscreen,is_closed);
-    }
-
-    //! Construct a display from an image list.
-    /** \param list The images list to display.
-        \param title Window title.
-        \param normalization Normalization type
-        (<tt>0</tt>=none, <tt>1</tt>=always, <tt>2</tt>=once, <tt>3</tt>=pixel type-dependent, see normalization()).
-        \param is_fullscreen Tells if fullscreen mode is enabled.
-        \param is_closed Tells if associated window is initially visible or not.
-        \note All images of the list, appended along the X-axis, are initially displayed on the associated window.
-    **/
-    template<typename T>
-    explicit CImgDisplay(const CImgList<T>& list,
-                         const char *const title=0, const unsigned int normalization=3,
-                         const bool is_fullscreen=false, const bool is_closed=false):
-      _width(0),_height(0),_normalization(0),
-      _min(0),_max(0),
-      _is_fullscreen(false),
-      _title(0),
-      _window_width(0),_window_height(0),_button(0),
-      _keys(new unsigned int[128]),_released_keys(new unsigned int[128]),
-      _window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),_wheel(0),
-      _is_closed(true),_is_resized(false),_is_moved(false),_is_event(false) {
-      assign(list,title,normalization,is_fullscreen,is_closed);
-    }
-
-    //! Construct a display as a copy of an existing one.
-    /**
-        \param disp Display instance to copy.
-        \note The pixel buffer of the input window is initially displayed on the associated window.
-    **/
-    CImgDisplay(const CImgDisplay& disp):
-      _width(0),_height(0),_normalization(0),
-      _min(0),_max(0),
-      _is_fullscreen(false),
-      _title(0),
-      _window_width(0),_window_height(0),_button(0),
-      _keys(new unsigned int[128]),_released_keys(new unsigned int[128]),
-      _window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),_wheel(0),
-      _is_closed(true),_is_resized(false),_is_moved(false),_is_event(false) {
-      assign(disp);
-    }
-
-    //! Take a screenshot.
-    /**
-       \param[out] img Output screenshot. Can be empty on input
-    **/
-    template<typename T>
-    static void screenshot(CImg<T>& img) {
-      return screenshot(0,0,cimg::type<int>::max(),cimg::type<int>::max(),img);
-    }
-
-#if cimg_display==0
-
-    static void _no_display_exception() {
-      throw CImgDisplayException("CImgDisplay(): No display available.");
-    }
-
-    //! Destructor - Empty constructor \inplace.
-    /**
-       \note Replace the current instance by an empty display.
-    **/
-    CImgDisplay& assign() {
-      return flush();
-    }
-
-    //! Construct a display with specified dimensions \inplace.
-    /**
-    **/
-    CImgDisplay& assign(const unsigned int width, const unsigned int height,
-                        const char *const title=0, const unsigned int normalization=3,
-                        const bool is_fullscreen=false, const bool is_closed=false) {
-      cimg::unused(width,height,title,normalization,is_fullscreen,is_closed);
-      _no_display_exception();
-      return assign();
-    }
-
-    //! Construct a display from an image \inplace.
-    /**
-    **/
-    template<typename T>
-    CImgDisplay& assign(const CImg<T>& img,
-                        const char *const title=0, const unsigned int normalization=3,
-                        const bool is_fullscreen=false, const bool is_closed=false) {
-      _no_display_exception();
-      return assign(img._width,img._height,title,normalization,is_fullscreen,is_closed);
-    }
-
-    //! Construct a display from an image list \inplace.
-    /**
-    **/
-    template<typename T>
-    CImgDisplay& assign(const CImgList<T>& list,
-                        const char *const title=0, const unsigned int normalization=3,
-                        const bool is_fullscreen=false, const bool is_closed=false) {
-      _no_display_exception();
-      return assign(list._width,list._width,title,normalization,is_fullscreen,is_closed);
-    }
-
-    //! Construct a display as a copy of another one \inplace.
-    /**
-    **/
-    CImgDisplay& assign(const CImgDisplay &disp) {
-      _no_display_exception();
-      return assign(disp._width,disp._height);
-    }
-
-#endif
-
-    //! Return a reference to an empty display.
-    /**
-       \note Can be useful for writing function prototypes where one of the argument (of type CImgDisplay&)
-       must have a default value.
-       \par Example
-       \code
-       void foo(CImgDisplay& disp=CImgDisplay::empty());
-       \endcode
-    **/
-    static CImgDisplay& empty() {
-      static CImgDisplay _empty;
-      return _empty.assign();
-    }
-
-    //! Return a reference to an empty display \const.
-    static const CImgDisplay& const_empty() {
-      static const CImgDisplay _empty;
-      return _empty;
-    }
-
-#define cimg_fitscreen(dx,dy,dz) CImgDisplay::_fitscreen(dx,dy,dz,128,-85,false), \
-                                 CImgDisplay::_fitscreen(dx,dy,dz,128,-85,true)
-    static unsigned int _fitscreen(const unsigned int dx, const unsigned int dy, const unsigned int dz,
-                                   const int dmin, const int dmax,const bool return_y) {
-      const unsigned int _nw = dx + (dz>1?dz:0), _nh = dy + (dz>1?dz:0);
-      unsigned int nw = _nw?_nw:1, nh = _nh?_nh:1;
-      const unsigned int
-        sw = (unsigned int)CImgDisplay::screen_width(),
-        sh = (unsigned int)CImgDisplay::screen_height(),
-        mw = dmin<0?(unsigned int)(sw*-dmin/100):(unsigned int)dmin,
-        mh = dmin<0?(unsigned int)(sh*-dmin/100):(unsigned int)dmin,
-        Mw = dmax<0?(unsigned int)(sw*-dmax/100):(unsigned int)dmax,
-        Mh = dmax<0?(unsigned int)(sh*-dmax/100):(unsigned int)dmax;
-      if (nw<mw) { nh = nh*mw/nw; nh+=(nh==0); nw = mw; }
-      if (nh<mh) { nw = nw*mh/nh; nw+=(nw==0); nh = mh; }
-      if (nw>Mw) { nh = nh*Mw/nw; nh+=(nh==0); nw = Mw; }
-      if (nh>Mh) { nw = nw*Mh/nh; nw+=(nw==0); nh = Mh; }
-      if (nw<mw) nw = mw;
-      if (nh<mh) nh = mh;
-      return return_y?nh:nw;
-    }
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Overloaded Operators
-    //@{
-    //------------------------------------------
-
-    //! Display image on associated window.
-    /**
-       \note <tt>disp = img</tt> is equivalent to <tt>disp.display(img)</tt>.
-    **/
-    template<typename t>
-    CImgDisplay& operator=(const CImg<t>& img) {
-      return display(img);
-    }
-
-    //! Display list of images on associated window.
-    /**
-       \note <tt>disp = list</tt> is equivalent to <tt>disp.display(list)</tt>.
-    **/
-    template<typename t>
-    CImgDisplay& operator=(const CImgList<t>& list) {
-      return display(list);
-    }
-
-    //! Construct a display as a copy of another one \inplace.
-    /**
-       \note Equivalent to assign(const CImgDisplay&).
-     **/
-    CImgDisplay& operator=(const CImgDisplay& disp) {
-      return assign(disp);
-    }
-
-    //! Return \c false if display is empty, \c true otherwise.
-    /**
-       \note <tt>if (disp) { ... }</tt> is equivalent to <tt>if (!disp.is_empty()) { ... }</tt>.
-    **/
-    operator bool() const {
-      return !is_empty();
-    }
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Instance Checking
-    //@{
-    //------------------------------------------
-
-    //! Return \c true if display is empty, \c false otherwise.
-    /**
-    **/
-    bool is_empty() const {
-      return !(_width && _height);
-    }
-
-    //! Return \c true if display is closed (i.e. not visible on the screen), \c false otherwise.
-    /**
-       \note
-       - When a user physically closes the associated window, the display is set to closed.
-       - A closed display is not destroyed. Its associated window can be show again on the screen using show().
-    **/
-    bool is_closed() const {
-      return _is_closed;
-    }
-
-    //! Return \c true if associated window has been resized on the screen, \c false otherwise.
-    /**
-    **/
-    bool is_resized() const {
-      return _is_resized;
-    }
-
-    //! Return \c true if associated window has been moved on the screen, \c false otherwise.
-    /**
-    **/
-    bool is_moved() const {
-      return _is_moved;
-    }
-
-    //! Return \c true if any event has occured on the associated window, \c false otherwise.
-    /**
-    **/
-    bool is_event() const {
-      return _is_event;
-    }
-
-    //! Return \c true if current display is in fullscreen mode, \c false otherwise.
-    /**
-    **/
-    bool is_fullscreen() const {
-      return _is_fullscreen;
-    }
-
-    //! Return \c true if any key is being pressed on the associated window, \c false otherwise.
-    /**
-       \note The methods below do the same only for specific keys.
-    **/
-    bool is_key() const {
-      return _is_keyESC || _is_keyF1 || _is_keyF2 || _is_keyF3 ||
-        _is_keyF4 || _is_keyF5 || _is_keyF6 || _is_keyF7 ||
-        _is_keyF8 || _is_keyF9 || _is_keyF10 || _is_keyF11 ||
-        _is_keyF12 || _is_keyPAUSE || _is_key1 || _is_key2 ||
-        _is_key3 || _is_key4 || _is_key5 || _is_key6 ||
-        _is_key7 || _is_key8 || _is_key9 || _is_key0 ||
-        _is_keyBACKSPACE || _is_keyINSERT || _is_keyHOME ||
-        _is_keyPAGEUP || _is_keyTAB || _is_keyQ || _is_keyW ||
-        _is_keyE || _is_keyR || _is_keyT || _is_keyY ||
-        _is_keyU || _is_keyI || _is_keyO || _is_keyP ||
-        _is_keyDELETE || _is_keyEND || _is_keyPAGEDOWN ||
-        _is_keyCAPSLOCK || _is_keyA || _is_keyS || _is_keyD ||
-        _is_keyF || _is_keyG || _is_keyH || _is_keyJ ||
-        _is_keyK || _is_keyL || _is_keyENTER ||
-        _is_keySHIFTLEFT || _is_keyZ || _is_keyX || _is_keyC ||
-        _is_keyV || _is_keyB || _is_keyN || _is_keyM ||
-        _is_keySHIFTRIGHT || _is_keyARROWUP || _is_keyCTRLLEFT ||
-        _is_keyAPPLEFT || _is_keyALT || _is_keySPACE || _is_keyALTGR ||
-        _is_keyAPPRIGHT || _is_keyMENU || _is_keyCTRLRIGHT ||
-        _is_keyARROWLEFT || _is_keyARROWDOWN || _is_keyARROWRIGHT ||
-        _is_keyPAD0 || _is_keyPAD1 || _is_keyPAD2 ||
-        _is_keyPAD3 || _is_keyPAD4 || _is_keyPAD5 ||
-        _is_keyPAD6 || _is_keyPAD7 || _is_keyPAD8 ||
-        _is_keyPAD9 || _is_keyPADADD || _is_keyPADSUB ||
-        _is_keyPADMUL || _is_keyPADDIV;
-    }
-
-    //! Return \c true if key specified by given keycode is being pressed on the associated window, \c false otherwise.
-    /**
-       \param keycode Keycode to test.
-       \note Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-       \par Example
-       \code
-       CImgDisplay disp(400,400);
-       while (!disp.is_closed()) {
-         if (disp.key(cimg::keyTAB)) { ... }  // Equivalent to 'if (disp.is_keyTAB())'.
-         disp.wait();
-       }
-       \endcode
-    **/
-    bool is_key(const unsigned int keycode) const {
-#define _cimg_iskey_test(k) if (keycode==cimg::key##k) return _is_key##k;
-      _cimg_iskey_test(ESC); _cimg_iskey_test(F1); _cimg_iskey_test(F2); _cimg_iskey_test(F3);
-      _cimg_iskey_test(F4); _cimg_iskey_test(F5); _cimg_iskey_test(F6); _cimg_iskey_test(F7);
-      _cimg_iskey_test(F8); _cimg_iskey_test(F9); _cimg_iskey_test(F10); _cimg_iskey_test(F11);
-      _cimg_iskey_test(F12); _cimg_iskey_test(PAUSE); _cimg_iskey_test(1); _cimg_iskey_test(2);
-      _cimg_iskey_test(3); _cimg_iskey_test(4); _cimg_iskey_test(5); _cimg_iskey_test(6);
-      _cimg_iskey_test(7); _cimg_iskey_test(8); _cimg_iskey_test(9); _cimg_iskey_test(0);
-      _cimg_iskey_test(BACKSPACE); _cimg_iskey_test(INSERT); _cimg_iskey_test(HOME);
-      _cimg_iskey_test(PAGEUP); _cimg_iskey_test(TAB); _cimg_iskey_test(Q); _cimg_iskey_test(W);
-      _cimg_iskey_test(E); _cimg_iskey_test(R); _cimg_iskey_test(T); _cimg_iskey_test(Y);
-      _cimg_iskey_test(U); _cimg_iskey_test(I); _cimg_iskey_test(O); _cimg_iskey_test(P);
-      _cimg_iskey_test(DELETE); _cimg_iskey_test(END); _cimg_iskey_test(PAGEDOWN);
-      _cimg_iskey_test(CAPSLOCK); _cimg_iskey_test(A); _cimg_iskey_test(S); _cimg_iskey_test(D);
-      _cimg_iskey_test(F); _cimg_iskey_test(G); _cimg_iskey_test(H); _cimg_iskey_test(J);
-      _cimg_iskey_test(K); _cimg_iskey_test(L); _cimg_iskey_test(ENTER);
-      _cimg_iskey_test(SHIFTLEFT); _cimg_iskey_test(Z); _cimg_iskey_test(X); _cimg_iskey_test(C);
-      _cimg_iskey_test(V); _cimg_iskey_test(B); _cimg_iskey_test(N); _cimg_iskey_test(M);
-      _cimg_iskey_test(SHIFTRIGHT); _cimg_iskey_test(ARROWUP); _cimg_iskey_test(CTRLLEFT);
-      _cimg_iskey_test(APPLEFT); _cimg_iskey_test(ALT); _cimg_iskey_test(SPACE); _cimg_iskey_test(ALTGR);
-      _cimg_iskey_test(APPRIGHT); _cimg_iskey_test(MENU); _cimg_iskey_test(CTRLRIGHT);
-      _cimg_iskey_test(ARROWLEFT); _cimg_iskey_test(ARROWDOWN); _cimg_iskey_test(ARROWRIGHT);
-      _cimg_iskey_test(PAD0); _cimg_iskey_test(PAD1); _cimg_iskey_test(PAD2);
-      _cimg_iskey_test(PAD3); _cimg_iskey_test(PAD4); _cimg_iskey_test(PAD5);
-      _cimg_iskey_test(PAD6); _cimg_iskey_test(PAD7); _cimg_iskey_test(PAD8);
-      _cimg_iskey_test(PAD9); _cimg_iskey_test(PADADD); _cimg_iskey_test(PADSUB);
-      _cimg_iskey_test(PADMUL); _cimg_iskey_test(PADDIV);
-      return false;
-    }
-
-    //! Return \c true if key specified by given keycode is being pressed on the associated window, \c false otherwise.
-    /**
-       \param keycode C-string containing the keycode label of the key to test.
-       \note Use it when the key you want to test can be dynamically set by the user.
-       \par Example
-       \code
-       CImgDisplay disp(400,400);
-       const char *const keycode = "TAB";
-       while (!disp.is_closed()) {
-         if (disp.is_key(keycode)) { ... }  // Equivalent to 'if (disp.is_keyTAB())'.
-         disp.wait();
-       }
-       \endcode
-    **/
-    bool& is_key(const char *const keycode) {
-      static bool f = false;
-      f = false;
-#define _cimg_iskey_test2(k) if (!cimg::strcasecmp(keycode,#k)) return _is_key##k;
-      _cimg_iskey_test2(ESC); _cimg_iskey_test2(F1); _cimg_iskey_test2(F2); _cimg_iskey_test2(F3);
-      _cimg_iskey_test2(F4); _cimg_iskey_test2(F5); _cimg_iskey_test2(F6); _cimg_iskey_test2(F7);
-      _cimg_iskey_test2(F8); _cimg_iskey_test2(F9); _cimg_iskey_test2(F10); _cimg_iskey_test2(F11);
-      _cimg_iskey_test2(F12); _cimg_iskey_test2(PAUSE); _cimg_iskey_test2(1); _cimg_iskey_test2(2);
-      _cimg_iskey_test2(3); _cimg_iskey_test2(4); _cimg_iskey_test2(5); _cimg_iskey_test2(6);
-      _cimg_iskey_test2(7); _cimg_iskey_test2(8); _cimg_iskey_test2(9); _cimg_iskey_test2(0);
-      _cimg_iskey_test2(BACKSPACE); _cimg_iskey_test2(INSERT); _cimg_iskey_test2(HOME);
-      _cimg_iskey_test2(PAGEUP); _cimg_iskey_test2(TAB); _cimg_iskey_test2(Q); _cimg_iskey_test2(W);
-      _cimg_iskey_test2(E); _cimg_iskey_test2(R); _cimg_iskey_test2(T); _cimg_iskey_test2(Y);
-      _cimg_iskey_test2(U); _cimg_iskey_test2(I); _cimg_iskey_test2(O); _cimg_iskey_test2(P);
-      _cimg_iskey_test2(DELETE); _cimg_iskey_test2(END); _cimg_iskey_test2(PAGEDOWN);
-      _cimg_iskey_test2(CAPSLOCK); _cimg_iskey_test2(A); _cimg_iskey_test2(S); _cimg_iskey_test2(D);
-      _cimg_iskey_test2(F); _cimg_iskey_test2(G); _cimg_iskey_test2(H); _cimg_iskey_test2(J);
-      _cimg_iskey_test2(K); _cimg_iskey_test2(L); _cimg_iskey_test2(ENTER);
-      _cimg_iskey_test2(SHIFTLEFT); _cimg_iskey_test2(Z); _cimg_iskey_test2(X); _cimg_iskey_test2(C);
-      _cimg_iskey_test2(V); _cimg_iskey_test2(B); _cimg_iskey_test2(N); _cimg_iskey_test2(M);
-      _cimg_iskey_test2(SHIFTRIGHT); _cimg_iskey_test2(ARROWUP); _cimg_iskey_test2(CTRLLEFT);
-      _cimg_iskey_test2(APPLEFT); _cimg_iskey_test2(ALT); _cimg_iskey_test2(SPACE); _cimg_iskey_test2(ALTGR);
-      _cimg_iskey_test2(APPRIGHT); _cimg_iskey_test2(MENU); _cimg_iskey_test2(CTRLRIGHT);
-      _cimg_iskey_test2(ARROWLEFT); _cimg_iskey_test2(ARROWDOWN); _cimg_iskey_test2(ARROWRIGHT);
-      _cimg_iskey_test2(PAD0); _cimg_iskey_test2(PAD1); _cimg_iskey_test2(PAD2);
-      _cimg_iskey_test2(PAD3); _cimg_iskey_test2(PAD4); _cimg_iskey_test2(PAD5);
-      _cimg_iskey_test2(PAD6); _cimg_iskey_test2(PAD7); _cimg_iskey_test2(PAD8);
-      _cimg_iskey_test2(PAD9); _cimg_iskey_test2(PADADD); _cimg_iskey_test2(PADSUB);
-      _cimg_iskey_test2(PADMUL); _cimg_iskey_test2(PADDIV);
-      return f;
-    }
-
-    //! Return \c true if specified key sequence has been typed on the associated window, \c false otherwise.
-    /**
-       \param keycodes_sequence Buffer of keycodes to test.
-       \param length Number of keys in the \c keycodes_sequence buffer.
-       \param remove_sequence Tells if the key sequence must be removed from the key history, if found.
-       \note Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-       \par Example
-       \code
-       CImgDisplay disp(400,400);
-       const unsigned int key_seq[] = { cimg::keyCTRLLEFT, cimg::keyD };
-       while (!disp.is_closed()) {
-         if (disp.is_key_sequence(key_seq,2)) { ... }  // Test for the 'CTRL+D' keyboard event.
-         disp.wait();
-       }
-       \endcode
-    **/
-    bool is_key_sequence(const unsigned int *const keycodes_sequence, const unsigned int length,
-                         const bool remove_sequence=false) {
-      if (keycodes_sequence && length) {
-        const unsigned int
-          *const ps_end = keycodes_sequence + length - 1,
-          *const pk_end = (unsigned int*)_keys + 1 + 128 - length,
-          k = *ps_end;
-        for (unsigned int *pk = (unsigned int*)_keys; pk<pk_end; ) {
-          if (*(pk++)==k) {
-            bool res = true;
-            const unsigned int *ps = ps_end, *pk2 = pk;
-            for (unsigned int i = 1; i<length; ++i) res = (*(--ps)==*(pk2++));
-            if (res) {
-              if (remove_sequence) std::memset((void*)(pk - 1),0,sizeof(unsigned int)*length);
-              return true;
-            }
-          }
-        }
-      }
-      return false;
-    }
-
-#define _cimg_iskey_def(k) \
-    bool is_key##k() const { \
-      return _is_key##k; \
-    }
-
-    //! Return \c true if the \c ESC key is being pressed on the associated window, \c false otherwise.
-    /**
-       \note Similar methods exist for all keys managed by \CImg (see cimg::keyESC).
-    **/
-    _cimg_iskey_def(ESC); _cimg_iskey_def(F1); _cimg_iskey_def(F2); _cimg_iskey_def(F3);
-    _cimg_iskey_def(F4); _cimg_iskey_def(F5); _cimg_iskey_def(F6); _cimg_iskey_def(F7);
-    _cimg_iskey_def(F8); _cimg_iskey_def(F9); _cimg_iskey_def(F10); _cimg_iskey_def(F11);
-    _cimg_iskey_def(F12); _cimg_iskey_def(PAUSE); _cimg_iskey_def(1); _cimg_iskey_def(2);
-    _cimg_iskey_def(3); _cimg_iskey_def(4); _cimg_iskey_def(5); _cimg_iskey_def(6);
-    _cimg_iskey_def(7); _cimg_iskey_def(8); _cimg_iskey_def(9); _cimg_iskey_def(0);
-    _cimg_iskey_def(BACKSPACE); _cimg_iskey_def(INSERT); _cimg_iskey_def(HOME);
-    _cimg_iskey_def(PAGEUP); _cimg_iskey_def(TAB); _cimg_iskey_def(Q); _cimg_iskey_def(W);
-    _cimg_iskey_def(E); _cimg_iskey_def(R); _cimg_iskey_def(T); _cimg_iskey_def(Y);
-    _cimg_iskey_def(U); _cimg_iskey_def(I); _cimg_iskey_def(O); _cimg_iskey_def(P);
-    _cimg_iskey_def(DELETE); _cimg_iskey_def(END); _cimg_iskey_def(PAGEDOWN);
-    _cimg_iskey_def(CAPSLOCK); _cimg_iskey_def(A); _cimg_iskey_def(S); _cimg_iskey_def(D);
-    _cimg_iskey_def(F); _cimg_iskey_def(G); _cimg_iskey_def(H); _cimg_iskey_def(J);
-    _cimg_iskey_def(K); _cimg_iskey_def(L); _cimg_iskey_def(ENTER);
-    _cimg_iskey_def(SHIFTLEFT); _cimg_iskey_def(Z); _cimg_iskey_def(X); _cimg_iskey_def(C);
-    _cimg_iskey_def(V); _cimg_iskey_def(B); _cimg_iskey_def(N); _cimg_iskey_def(M);
-    _cimg_iskey_def(SHIFTRIGHT); _cimg_iskey_def(ARROWUP); _cimg_iskey_def(CTRLLEFT);
-    _cimg_iskey_def(APPLEFT); _cimg_iskey_def(ALT); _cimg_iskey_def(SPACE); _cimg_iskey_def(ALTGR);
-    _cimg_iskey_def(APPRIGHT); _cimg_iskey_def(MENU); _cimg_iskey_def(CTRLRIGHT);
-    _cimg_iskey_def(ARROWLEFT); _cimg_iskey_def(ARROWDOWN); _cimg_iskey_def(ARROWRIGHT);
-    _cimg_iskey_def(PAD0); _cimg_iskey_def(PAD1); _cimg_iskey_def(PAD2);
-    _cimg_iskey_def(PAD3); _cimg_iskey_def(PAD4); _cimg_iskey_def(PAD5);
-    _cimg_iskey_def(PAD6); _cimg_iskey_def(PAD7); _cimg_iskey_def(PAD8);
-    _cimg_iskey_def(PAD9); _cimg_iskey_def(PADADD); _cimg_iskey_def(PADSUB);
-    _cimg_iskey_def(PADMUL); _cimg_iskey_def(PADDIV);
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Instance Characteristics
-    //@{
-    //------------------------------------------
-
-#if cimg_display==0
-
-    //! Return width of the screen (current resolution along the X-axis).
-    /**
-    **/
-    static int screen_width() {
-      _no_display_exception();
-      return 0;
-    }
-
-    //! Return height of the screen (current resolution along the Y-axis).
-    /**
-    **/
-    static int screen_height() {
-      _no_display_exception();
-      return 0;
-    }
-
-#endif
-
-    //! Return display width.
-    /**
-       \note The width of the display (i.e. the width of the pixel data buffer associated to the CImgDisplay instance)
-       may be different from the actual width of the associated window.
-    **/
-    int width() const {
-      return (int)_width;
-    }
-
-    //! Return display height.
-    /**
-       \note The height of the display (i.e. the height of the pixel data buffer associated to the CImgDisplay instance)
-       may be different from the actual height of the associated window.
-    **/
-    int height() const {
-      return (int)_height;
-    }
-
-    //! Return normalization type of the display.
-    /**
-       The normalization type tells about how the values of an input image are normalized by the CImgDisplay to be
-       correctly displayed. The range of values for pixels displayed on screen is <tt>[0,255]</tt>.
-       If the range of values of the data to display is different, a normalization may be required for displaying
-       the data in a correct way. The normalization type can be one of:
-       - \c 0: Value normalization is disabled. It is then assumed that all input data to be displayed by the
-       CImgDisplay instance have values in range <tt>[0,255]</tt>.
-       - \c 1: Value normalization is always performed (this is the default behavior).
-       Before displaying an input image, its values will be (virtually) stretched
-       in range <tt>[0,255]</tt>, so that the contrast of the displayed pixels will be maximum.
-       Use this mode for images whose minimum and maximum values are not prescribed to known values
-       (e.g. float-valued images).
-       Note that when normalized versions of images are computed for display purposes, the actual values of these
-       images are not modified.
-       - \c 2: Value normalization is performed once (on the first image display), then the same normalization
-       coefficients are kept for next displayed frames.
-       - \c 3: Value normalization depends on the pixel type of the data to display. For integer pixel types,
-       the normalization is done regarding the minimum/maximum values of the type (no normalization occurs then
-       for <tt>unsigned char</tt>).
-       For float-valued pixel types, the normalization is done regarding the minimum/maximum value of the image
-       data instead.
-    **/
-    unsigned int normalization() const {
-      return _normalization;
-    }
-
-    //! Return title of the associated window as a C-string.
-    /**
-       \note Window title may be not visible, depending on the used window manager or if the current display is
-       in fullscreen mode.
-    **/
-    const char *title() const {
-      return _title?_title:"";
-    }
-
-    //! Return width of the associated window.
-    /**
-       \note The width of the display (i.e. the width of the pixel data buffer associated to the CImgDisplay instance)
-       may be different from the actual width of the associated window.
-    **/
-    int window_width() const {
-      return (int)_window_width;
-    }
-
-    //! Return height of the associated window.
-    /**
-       \note The height of the display (i.e. the height of the pixel data buffer associated to the CImgDisplay instance)
-       may be different from the actual height of the associated window.
-    **/
-    int window_height() const {
-      return (int)_window_height;
-    }
-
-    //! Return X-coordinate of the associated window.
-    /**
-       \note The returned coordinate corresponds to the location of the upper-left corner of the associated window.
-    **/
-    int window_x() const {
-      return _window_x;
-    }
-
-    //! Return Y-coordinate of the associated window.
-    /**
-       \note The returned coordinate corresponds to the location of the upper-left corner of the associated window.
-    **/
-    int window_y() const {
-      return _window_y;
-    }
-
-    //! Return X-coordinate of the mouse pointer.
-    /**
-       \note
-       - If the mouse pointer is outside window area, \c -1 is returned.
-       - Otherwise, the returned value is in the range [0,width()-1].
-    **/
-    int mouse_x() const {
-      return _mouse_x;
-    }
-
-    //! Return Y-coordinate of the mouse pointer.
-    /**
-       \note
-       - If the mouse pointer is outside window area, \c -1 is returned.
-       - Otherwise, the returned value is in the range [0,height()-1].
-    **/
-    int mouse_y() const {
-      return _mouse_y;
-    }
-
-    //! Return current state of the mouse buttons.
-    /**
-       \note Three mouse buttons can be managed. If one button is pressed, its corresponding bit in the returned
-       value is set:
-       - bit \c 0 (value \c 0x1): State of the left mouse button.
-       - bit \c 1 (value \c 0x2): State of the right mouse button.
-       - bit \c 2 (value \c 0x4): State of the middle mouse button.
-
-       Several bits can be activated if more than one button are pressed at the same time.
-       \par Example
-       \code
-       CImgDisplay disp(400,400);
-       while (!disp.is_closed()) {
-         if (disp.button()&1) { // Left button clicked.
-           ...
-         }
-         if (disp.button()&2) { // Right button clicked.
-           ...
-         }
-         if (disp.button()&4) { // Middle button clicked.
-           ...
-         }
-         disp.wait();
-       }
-       \endcode
-    **/
-    unsigned int button() const {
-      return _button;
-    }
-
-    //! Return current state of the mouse wheel.
-    /**
-       \note
-       - The returned value can be positive or negative depending on whether the mouse wheel has been scrolled
-       forward or backward.
-       - Scrolling the wheel forward add \c 1 to the wheel value.
-       - Scrolling the wheel backward substract \c 1 to the wheel value.
-       - The returned value cumulates the number of forward of backward scrolls since the creation of the display,
-       or since the last reset of the wheel value (using set_wheel()). It is strongly recommended to quickly reset
-       the wheel counter when an action has been performed regarding the current wheel value.
-       Otherwise, the returned wheel value may be for instance \c 0 despite the fact that many scrolls have been done
-       (as many in forward as in backward directions).
-       \par Example
-       \code
-       CImgDisplay disp(400,400);
-       while (!disp.is_closed()) {
-         if (disp.wheel()) {
-           int counter = disp.wheel();  // Read the state of the mouse wheel.
-           ...                          // Do what you want with 'counter'.
-           disp.set_wheel();            // Reset the wheel value to 0.
-         }
-         disp.wait();
-       }
-       \endcode
-    **/
-    int wheel() const {
-      return _wheel;
-    }
-
-    //! Return one entry from the pressed keys history.
-    /**
-       \param pos Indice to read from the pressed keys history (indice \c 0 corresponds to latest entry).
-       \return Keycode of a pressed key or \c 0 for a released key.
-       \note
-       - Each CImgDisplay stores a history of the pressed keys in a buffer of size \c 128. When a new key is pressed,
-       its keycode is stored in the pressed keys history. When a key is released, \c 0 is put instead.
-       This means that up to the 64 last pressed keys may be read from the pressed keys history.
-       When a new value is stored, the pressed keys history is shifted so that the latest entry is always
-       stored at position \c 0.
-       - Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-    **/
-    unsigned int key(const unsigned int pos=0) const {
-      return pos<128?_keys[pos]:0;
-    }
-
-    //! Return one entry from the released keys history.
-    /**
-       \param pos Indice to read from the released keys history (indice \c 0 corresponds to latest entry).
-       \return Keycode of a released key or \c 0 for a pressed key.
-       \note
-       - Each CImgDisplay stores a history of the released keys in a buffer of size \c 128. When a new key is released,
-       its keycode is stored in the pressed keys history. When a key is pressed, \c 0 is put instead.
-       This means that up to the 64 last released keys may be read from the released keys history.
-       When a new value is stored, the released keys history is shifted so that the latest entry is always
-       stored at position \c 0.
-       - Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-    **/
-    unsigned int released_key(const unsigned int pos=0) const {
-      return pos<128?_released_keys[pos]:0;
-    }
-
-    //! Return keycode corresponding to the specified string.
-    /**
-       \note Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-       \par Example
-       \code
-       const unsigned int keyTAB = CImgDisplay::keycode("TAB");  // Return cimg::keyTAB.
-       \endcode
-    **/
-    static unsigned int keycode(const char *const keycode) {
-#define _cimg_keycode(k) if (!cimg::strcasecmp(keycode,#k)) return cimg::key##k;
-      _cimg_keycode(ESC); _cimg_keycode(F1); _cimg_keycode(F2); _cimg_keycode(F3);
-      _cimg_keycode(F4); _cimg_keycode(F5); _cimg_keycode(F6); _cimg_keycode(F7);
-      _cimg_keycode(F8); _cimg_keycode(F9); _cimg_keycode(F10); _cimg_keycode(F11);
-      _cimg_keycode(F12); _cimg_keycode(PAUSE); _cimg_keycode(1); _cimg_keycode(2);
-      _cimg_keycode(3); _cimg_keycode(4); _cimg_keycode(5); _cimg_keycode(6);
-      _cimg_keycode(7); _cimg_keycode(8); _cimg_keycode(9); _cimg_keycode(0);
-      _cimg_keycode(BACKSPACE); _cimg_keycode(INSERT); _cimg_keycode(HOME);
-      _cimg_keycode(PAGEUP); _cimg_keycode(TAB); _cimg_keycode(Q); _cimg_keycode(W);
-      _cimg_keycode(E); _cimg_keycode(R); _cimg_keycode(T); _cimg_keycode(Y);
-      _cimg_keycode(U); _cimg_keycode(I); _cimg_keycode(O); _cimg_keycode(P);
-      _cimg_keycode(DELETE); _cimg_keycode(END); _cimg_keycode(PAGEDOWN);
-      _cimg_keycode(CAPSLOCK); _cimg_keycode(A); _cimg_keycode(S); _cimg_keycode(D);
-      _cimg_keycode(F); _cimg_keycode(G); _cimg_keycode(H); _cimg_keycode(J);
-      _cimg_keycode(K); _cimg_keycode(L); _cimg_keycode(ENTER);
-      _cimg_keycode(SHIFTLEFT); _cimg_keycode(Z); _cimg_keycode(X); _cimg_keycode(C);
-      _cimg_keycode(V); _cimg_keycode(B); _cimg_keycode(N); _cimg_keycode(M);
-      _cimg_keycode(SHIFTRIGHT); _cimg_keycode(ARROWUP); _cimg_keycode(CTRLLEFT);
-      _cimg_keycode(APPLEFT); _cimg_keycode(ALT); _cimg_keycode(SPACE); _cimg_keycode(ALTGR);
-      _cimg_keycode(APPRIGHT); _cimg_keycode(MENU); _cimg_keycode(CTRLRIGHT);
-      _cimg_keycode(ARROWLEFT); _cimg_keycode(ARROWDOWN); _cimg_keycode(ARROWRIGHT);
-      _cimg_keycode(PAD0); _cimg_keycode(PAD1); _cimg_keycode(PAD2);
-      _cimg_keycode(PAD3); _cimg_keycode(PAD4); _cimg_keycode(PAD5);
-      _cimg_keycode(PAD6); _cimg_keycode(PAD7); _cimg_keycode(PAD8);
-      _cimg_keycode(PAD9); _cimg_keycode(PADADD); _cimg_keycode(PADSUB);
-      _cimg_keycode(PADMUL); _cimg_keycode(PADDIV);
-      return 0;
-    }
-
-    //! Return the current refresh rate, in frames per second.
-    /**
-       \note Returns a significant value when the current instance is used to display successive frames.
-       It measures the delay between successive calls to frames_per_second().
-    **/
-    float frames_per_second() {
-      if (!_fps_timer) _fps_timer = cimg::time();
-      const float delta = (cimg::time() - _fps_timer)/1000.0f;
-      ++_fps_frames;
-      if (delta>=1) {
-        _fps_fps = _fps_frames/delta;
-        _fps_frames = 0;
-        _fps_timer = cimg::time();
-      }
-      return _fps_fps;
-    }
-
-    //@}
-    //---------------------------------------
-    //
-    //! \name Window Manipulation
-    //@{
-    //---------------------------------------
-
-#if cimg_display==0
-
-    //! Display image on associated window.
-    /**
-       \param img Input image to display.
-       \note This method returns immediately.
-    **/
-    template<typename T>
-    CImgDisplay& display(const CImg<T>& img) {
-      return assign(img);
-    }
-
-#endif
-
-    //! Display list of images on associated window.
-    /**
-       \param list List of images to display.
-       \param axis Axis used to append the images along, for the visualization (can be \c x, \c y, \c z or \c c).
-       \param align Relative position of aligned images when displaying lists with images of different sizes
-       (\c 0 for upper-left, \c 0.5 for centering and \c 1 for lower-right).
-       \note This method returns immediately.
-    **/
-    template<typename T>
-    CImgDisplay& display(const CImgList<T>& list, const char axis='x', const float align=0) {
-      if (list._width==1) {
-        const CImg<T>& img = list[0];
-        if (img._depth==1 && (img._spectrum==1 || img._spectrum>=3) && _normalization!=1) return display(img);
-      }
-      CImgList<typename CImg<T>::ucharT> visu(list._width);
-      unsigned int dims = 0;
-      cimglist_for(list,l) {
-        const CImg<T>& img = list._data[l];
-        img.__get_select(*this,_normalization,(img._width - 1)/2,(img._height - 1)/2,
-                         (img._depth - 1)/2).move_to(visu[l]);
-        dims = std::max(dims,visu[l]._spectrum);
-      }
-      cimglist_for(list,l) if (visu[l]._spectrum<dims) visu[l].resize(-100,-100,-100,dims,1);
-      visu.get_append(axis,align).display(*this);
-      return *this;
-    }
-
-#if cimg_display==0
-
-    //! Show (closed) associated window on the screen.
-    /**
-       \note
-       - Force the associated window of a display to be visible on the screen, even if it has been closed before.
-       - Using show() on a visible display does nothing.
-    **/
-    CImgDisplay& show() {
-      return assign();
-    }
-
-    //! Close (visible) associated window and make it disappear from the screen.
-    /**
-       \note
-       - A closed display only means the associated window is not visible anymore. This does not mean the display has
-       been destroyed.
-       Use show() to make the associated window reappear.
-       - Using close() on a closed display does nothing.
-    **/
-    CImgDisplay& close() {
-      return assign();
-    }
-
-    //! Move associated window to a new location.
-    /**
-       \param pos_x X-coordinate of the new window location.
-       \param pos_y Y-coordinate of the new window location.
-       \note Depending on the window manager behavior, this method may not succeed (no exceptions are thrown
-       nevertheless).
-    **/
-    CImgDisplay& move(const int pos_x, const int pos_y) {
-      return assign(pos_x,pos_y);
-    }
-
-#endif
-
-    //! Resize display to the size of the associated window.
-    /**
-       \param force_redraw Tells if the previous window content must be updated and refreshed as well.
-       \note
-       - Calling this method ensures that width() and window_width() become equal, as well as height() and
-       window_height().
-       - The associated window is also resized to specified dimensions.
-    **/
-    CImgDisplay& resize(const bool force_redraw=true) {
-      resize(window_width(),window_height(),force_redraw);
-      return *this;
-    }
-
-#if cimg_display==0
-
-    //! Resize display to the specified size.
-    /**
-       \param width Requested display width.
-       \param height Requested display height.
-       \param force_redraw Tells if the previous window content must be updated and refreshed as well.
-       \note The associated window is also resized to specified dimensions.
-    **/
-    CImgDisplay& resize(const int width, const int height, const bool force_redraw=true) {
-      return assign(width,height,0,3,force_redraw);
-    }
-
-#endif
-
-    //! Resize display to the size of an input image.
-    /**
-       \param img Input image to take size from.
-       \param force_redraw Tells if the previous window content must be resized and updated as well.
-       \note
-       - Calling this method ensures that width() and <tt>img.width()</tt> become equal, as well as height() and
-       <tt>img.height()</tt>.
-       - The associated window is also resized to specified dimensions.
-    **/
-    template<typename T>
-    CImgDisplay& resize(const CImg<T>& img, const bool force_redraw=true) {
-      return resize(img._width,img._height,force_redraw);
-    }
-
-    //! Resize display to the size of another CImgDisplay instance.
-    /**
-       \param disp Input display to take size from.
-       \param force_redraw Tells if the previous window content must be resized and updated as well.
-       \note
-       - Calling this method ensures that width() and <tt>disp.width()</tt> become equal, as well as height() and
-       <tt>disp.height()</tt>.
-       - The associated window is also resized to specified dimensions.
-    **/
-    CImgDisplay& resize(const CImgDisplay& disp, const bool force_redraw=true) {
-      return resize(disp.width(),disp.height(),force_redraw);
-    }
-
-    // [internal] Render pixel buffer with size (wd,hd) from source buffer of size (ws,hs).
-    template<typename t, typename T>
-    static void _render_resize(const T *ptrs, const unsigned int ws, const unsigned int hs,
-                               t *ptrd, const unsigned int wd, const unsigned int hd) {
-      unsigned int *const offx = new unsigned int[wd], *const offy = new unsigned int[hd + 1], *poffx, *poffy;
-      float s, curr, old;
-      s = (float)ws/wd;
-      poffx = offx; curr = 0; for (unsigned int x = 0; x<wd; ++x) {
-        old = curr; curr+=s; *(poffx++) = (unsigned int)curr - (unsigned int)old;
-      }
-      s = (float)hs/hd;
-      poffy = offy; curr = 0; for (unsigned int y = 0; y<hd; ++y) {
-        old = curr; curr+=s; *(poffy++) = ws*((unsigned int)curr - (unsigned int)old);
-      }
-      *poffy = 0;
-      poffy = offy;
-      for (unsigned int y = 0; y<hd; ) {
-        const T *ptr = ptrs;
-        poffx = offx;
-        for (unsigned int x = 0; x<wd; ++x) { *(ptrd++) = *ptr; ptr+=*(poffx++); }
-        ++y;
-        unsigned int dy = *(poffy++);
-        for ( ; !dy && y<hd; std::memcpy(ptrd,ptrd - wd,sizeof(t)*wd), ++y, ptrd+=wd, dy = *(poffy++)) {}
-        ptrs+=dy;
-      }
-      delete[] offx; delete[] offy;
-    }
-
-    //! Set normalization type.
-    /**
-       \param normalization New normalization mode.
-    **/
-    CImgDisplay& set_normalization(const unsigned int normalization) {
-      _normalization = normalization;
-      _min = _max = 0;
-      return *this;
-    }
-
-#if cimg_display==0
-
-    //! Set title of the associated window.
-    /**
-       \param format C-string containing the format of the title, as with <tt>std::printf()</tt>.
-       \warning As the first argument is a format string, it is highly recommended to write
-       \code
-       disp.set_title("%s",window_title);
-       \endcode
-       instead of
-       \code
-       disp.set_title(window_title);
-       \endcode
-       if \c window_title can be arbitrary, to prevent nasty memory access.
-    **/
-    CImgDisplay& set_title(const char *const format, ...) {
-      return assign(0,0,format);
-    }
-
-#endif
-
-    //! Enable or disable fullscreen mode.
-    /**
-       \param is_fullscreen Tells is the fullscreen mode must be activated or not.
-       \param force_redraw Tells if the previous window content must be displayed as well.
-       \note
-       - When the fullscreen mode is enabled, the associated window fills the entire screen but the size of the
-       current display is not modified.
-       - The screen resolution may be switched to fit the associated window size and ensure it appears the largest
-       as possible.
-       For X-Window (X11) users, the configuration flag \c cimg_use_xrandr has to be set to allow the screen
-       resolution change (requires the X11 extensions to be enabled).
-    **/
-    CImgDisplay& set_fullscreen(const bool is_fullscreen, const bool force_redraw=true) {
-      if (is_empty() || _is_fullscreen==is_fullscreen) return *this;
-      return toggle_fullscreen(force_redraw);
-    }
-
-#if cimg_display==0
-
-    //! Toggle fullscreen mode.
-    /**
-       \param force_redraw Tells if the previous window content must be displayed as well.
-       \note Enable fullscreen mode if it was not enabled, and disable it otherwise.
-    **/
-    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
-      return assign(_width,_height,0,3,force_redraw);
-    }
-
-    //! Show mouse pointer.
-    /**
-       \note Depending on the window manager behavior, this method may not succeed
-       (no exceptions are thrown nevertheless).
-    **/
-    CImgDisplay& show_mouse() {
-      return assign();
-    }
-
-    //! Hide mouse pointer.
-    /**
-       \note Depending on the window manager behavior, this method may not succeed
-       (no exceptions are thrown nevertheless).
-    **/
-    CImgDisplay& hide_mouse() {
-      return assign();
-    }
-
-    //! Move mouse pointer to a specified location.
-    /**
-       \note Depending on the window manager behavior, this method may not succeed
-       (no exceptions are thrown nevertheless).
-    **/
-    CImgDisplay& set_mouse(const int pos_x, const int pos_y) {
-      return assign(pos_x,pos_y);
-    }
-
-#endif
-
-    //! Simulate a mouse button release event.
-    /**
-       \note All mouse buttons are considered released at the same time.
-    **/
-    CImgDisplay& set_button() {
-      _button = 0;
-      _is_event = true;
-#if cimg_display==1
-      pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-      SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      return *this;
-    }
-
-    //! Simulate a mouse button press or release event.
-    /**
-       \param button Buttons event code, where each button is associated to a single bit.
-       \param is_pressed Tells if the mouse button is considered as pressed or released.
-    **/
-    CImgDisplay& set_button(const unsigned int button, const bool is_pressed=true) {
-      const unsigned int buttoncode = button==1U?1U:button==2U?2U:button==3U?4U:0U;
-      if (is_pressed) _button |= buttoncode; else _button &= ~buttoncode;
-      _is_event = buttoncode?true:false;
-      if (buttoncode) {
-#if cimg_display==1
-        pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-        SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      }
-      return *this;
-    }
-
-    //! Flush all mouse wheel events.
-    /**
-       \note Make wheel() to return \c 0, if called afterwards.
-    **/
-    CImgDisplay& set_wheel() {
-      _wheel = 0;
-      _is_event = true;
-#if cimg_display==1
-      pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-      SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      return *this;
-    }
-
-    //! Simulate a wheel event.
-    /**
-       \param amplitude Amplitude of the wheel scrolling to simulate.
-       \note Make wheel() to return \c amplitude, if called afterwards.
-    **/
-    CImgDisplay& set_wheel(const int amplitude) {
-      _wheel+=amplitude;
-      _is_event = amplitude?true:false;
-      if (amplitude) {
-#if cimg_display==1
-        pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-        SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      }
-      return *this;
-    }
-
-    //! Flush all key events.
-    /**
-       \note Make key() to return \c 0, if called afterwards.
-    **/
-    CImgDisplay& set_key() {
-      std::memset((void*)_keys,0,128*sizeof(unsigned int));
-      std::memset((void*)_released_keys,0,128*sizeof(unsigned int));
-      _is_keyESC = _is_keyF1 = _is_keyF2 = _is_keyF3 = _is_keyF4 = _is_keyF5 = _is_keyF6 = _is_keyF7 = _is_keyF8 =
-        _is_keyF9 = _is_keyF10 = _is_keyF11 = _is_keyF12 = _is_keyPAUSE = _is_key1 = _is_key2 = _is_key3 = _is_key4 =
-        _is_key5 = _is_key6 = _is_key7 = _is_key8 = _is_key9 = _is_key0 = _is_keyBACKSPACE = _is_keyINSERT =
-        _is_keyHOME = _is_keyPAGEUP = _is_keyTAB = _is_keyQ = _is_keyW = _is_keyE = _is_keyR = _is_keyT = _is_keyY =
-        _is_keyU = _is_keyI = _is_keyO = _is_keyP = _is_keyDELETE = _is_keyEND = _is_keyPAGEDOWN = _is_keyCAPSLOCK =
-        _is_keyA = _is_keyS = _is_keyD = _is_keyF = _is_keyG = _is_keyH = _is_keyJ = _is_keyK = _is_keyL =
-        _is_keyENTER = _is_keySHIFTLEFT = _is_keyZ = _is_keyX = _is_keyC = _is_keyV = _is_keyB = _is_keyN =
-        _is_keyM = _is_keySHIFTRIGHT = _is_keyARROWUP = _is_keyCTRLLEFT = _is_keyAPPLEFT = _is_keyALT = _is_keySPACE =
-        _is_keyALTGR = _is_keyAPPRIGHT = _is_keyMENU = _is_keyCTRLRIGHT = _is_keyARROWLEFT = _is_keyARROWDOWN =
-        _is_keyARROWRIGHT = _is_keyPAD0 = _is_keyPAD1 = _is_keyPAD2 = _is_keyPAD3 = _is_keyPAD4 = _is_keyPAD5 =
-        _is_keyPAD6 = _is_keyPAD7 = _is_keyPAD8 = _is_keyPAD9 = _is_keyPADADD = _is_keyPADSUB = _is_keyPADMUL =
-        _is_keyPADDIV = false;
-      _is_event = true;
-#if cimg_display==1
-      pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-      SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      return *this;
-    }
-
-    //! Simulate a keyboard press/release event.
-    /**
-       \param keycode Keycode of the associated key.
-       \param is_pressed Tells if the key is considered as pressed or released.
-       \note Keycode constants are defined in the cimg namespace and are architecture-dependent. Use them to ensure
-       your code stay portable (see cimg::keyESC).
-    **/
-    CImgDisplay& set_key(const unsigned int keycode, const bool is_pressed=true) {
-#define _cimg_set_key(k) if (keycode==cimg::key##k) _is_key##k = is_pressed;
-      _cimg_set_key(ESC); _cimg_set_key(F1); _cimg_set_key(F2); _cimg_set_key(F3);
-      _cimg_set_key(F4); _cimg_set_key(F5); _cimg_set_key(F6); _cimg_set_key(F7);
-      _cimg_set_key(F8); _cimg_set_key(F9); _cimg_set_key(F10); _cimg_set_key(F11);
-      _cimg_set_key(F12); _cimg_set_key(PAUSE); _cimg_set_key(1); _cimg_set_key(2);
-      _cimg_set_key(3); _cimg_set_key(4); _cimg_set_key(5); _cimg_set_key(6);
-      _cimg_set_key(7); _cimg_set_key(8); _cimg_set_key(9); _cimg_set_key(0);
-      _cimg_set_key(BACKSPACE); _cimg_set_key(INSERT); _cimg_set_key(HOME);
-      _cimg_set_key(PAGEUP); _cimg_set_key(TAB); _cimg_set_key(Q); _cimg_set_key(W);
-      _cimg_set_key(E); _cimg_set_key(R); _cimg_set_key(T); _cimg_set_key(Y);
-      _cimg_set_key(U); _cimg_set_key(I); _cimg_set_key(O); _cimg_set_key(P);
-      _cimg_set_key(DELETE); _cimg_set_key(END); _cimg_set_key(PAGEDOWN);
-      _cimg_set_key(CAPSLOCK); _cimg_set_key(A); _cimg_set_key(S); _cimg_set_key(D);
-      _cimg_set_key(F); _cimg_set_key(G); _cimg_set_key(H); _cimg_set_key(J);
-      _cimg_set_key(K); _cimg_set_key(L); _cimg_set_key(ENTER);
-      _cimg_set_key(SHIFTLEFT); _cimg_set_key(Z); _cimg_set_key(X); _cimg_set_key(C);
-      _cimg_set_key(V); _cimg_set_key(B); _cimg_set_key(N); _cimg_set_key(M);
-      _cimg_set_key(SHIFTRIGHT); _cimg_set_key(ARROWUP); _cimg_set_key(CTRLLEFT);
-      _cimg_set_key(APPLEFT); _cimg_set_key(ALT); _cimg_set_key(SPACE); _cimg_set_key(ALTGR);
-      _cimg_set_key(APPRIGHT); _cimg_set_key(MENU); _cimg_set_key(CTRLRIGHT);
-      _cimg_set_key(ARROWLEFT); _cimg_set_key(ARROWDOWN); _cimg_set_key(ARROWRIGHT);
-      _cimg_set_key(PAD0); _cimg_set_key(PAD1); _cimg_set_key(PAD2);
-      _cimg_set_key(PAD3); _cimg_set_key(PAD4); _cimg_set_key(PAD5);
-      _cimg_set_key(PAD6); _cimg_set_key(PAD7); _cimg_set_key(PAD8);
-      _cimg_set_key(PAD9); _cimg_set_key(PADADD); _cimg_set_key(PADSUB);
-      _cimg_set_key(PADMUL); _cimg_set_key(PADDIV);
-      if (is_pressed) {
-        if (*_keys)
-          std::memmove((void*)(_keys + 1),(void*)_keys,127*sizeof(unsigned int));
-        *_keys = keycode;
-        if (*_released_keys) {
-          std::memmove((void*)(_released_keys + 1),(void*)_released_keys,127*sizeof(unsigned int));
-          *_released_keys = 0;
-        }
-      } else {
-        if (*_keys) {
-          std::memmove((void*)(_keys + 1),(void*)_keys,127*sizeof(unsigned int));
-          *_keys = 0;
-        }
-        if (*_released_keys)
-          std::memmove((void*)(_released_keys + 1),(void*)_released_keys,127*sizeof(unsigned int));
-        *_released_keys = keycode;
-      }
-      _is_event = keycode?true:false;
-      if (keycode) {
-#if cimg_display==1
-        pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-#elif cimg_display==2
-        SetEvent(cimg::Win32_attr().wait_event);
-#endif
-      }
-      return *this;
-    }
-
-    //! Flush all display events.
-    /**
-       \note Remove all passed events from the current display.
-    **/
-    CImgDisplay& flush() {
-      set_key().set_button().set_wheel();
-      _is_resized = _is_moved = _is_event = false;
-      _fps_timer = _fps_frames = _timer = 0;
-      _fps_fps = 0;
-      return *this;
-    }
-
-    //! Wait for any user event occuring on the current display.
-    CImgDisplay& wait() {
-      wait(*this);
-      return *this;
-    }
-
-    //! Wait for a given number of milliseconds since the last call to wait().
-    /**
-       \param milliseconds Number of milliseconds to wait for.
-       \note Similar to cimg::wait().
-    **/
-    CImgDisplay& wait(const unsigned int milliseconds) {
-      cimg::_wait(milliseconds,_timer);
-      return *this;
-    }
-
-    //! Wait for any event occuring on the display \c disp1.
-    static void wait(CImgDisplay& disp1) {
-      disp1._is_event = false;
-      while (!disp1._is_closed && !disp1._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1 or \c disp2.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2) {
-      disp1._is_event = disp2._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed) &&
-             !disp1._is_event && !disp2._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2 or \c disp3.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3) {
-      disp1._is_event = disp2._is_event = disp3._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3 or \c disp4.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4 or \c disp5.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4,
-                     CImgDisplay& disp5) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event)
-        wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp6.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
-                     CImgDisplay& disp6) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
-        disp6._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
-              !disp6._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
-             !disp6._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp7.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
-                     CImgDisplay& disp6, CImgDisplay& disp7) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
-        disp6._is_event = disp7._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
-              !disp6._is_closed || !disp7._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
-             !disp6._is_event && !disp7._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp8.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
-                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
-        disp6._is_event = disp7._is_event = disp8._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
-              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
-             !disp6._is_event && !disp7._is_event && !disp8._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp9.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
-                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8, CImgDisplay& disp9) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
-        disp6._is_event = disp7._is_event = disp8._is_event = disp9._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
-              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed || !disp9._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
-             !disp6._is_event && !disp7._is_event && !disp8._is_event && !disp9._is_event) wait_all();
-    }
-
-    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp10.
-    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
-                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8, CImgDisplay& disp9,
-                     CImgDisplay& disp10) {
-      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
-        disp6._is_event = disp7._is_event = disp8._is_event = disp9._is_event = disp10._is_event = false;
-      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
-              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed || !disp9._is_closed || !disp10._is_closed) &&
-             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
-             !disp6._is_event && !disp7._is_event && !disp8._is_event && !disp9._is_event && !disp10._is_event)
-        wait_all();
-    }
-
-#if cimg_display==0
-
-    //! Wait for any window event occuring in any opened CImgDisplay.
-    static void wait_all() {
-      return _no_display_exception();
-    }
-
-    //! Render image into internal display buffer.
-    /**
-       \param img Input image data to render.
-       \note
-       - Convert image data representation into the internal display buffer (architecture-dependent structure).
-       - The content of the associated window is not modified, until paint() is called.
-       - Should not be used for common CImgDisplay uses, since display() is more useful.
-    **/
-    template<typename T>
-    CImgDisplay& render(const CImg<T>& img) {
-      return assign(img);
-    }
-
-    //! Paint internal display buffer on associated window.
-    /**
-       \note
-       - Update the content of the associated window with the internal display buffer, e.g. after a render() call.
-       - Should not be used for common CImgDisplay uses, since display() is more useful.
-    **/
-    CImgDisplay& paint() {
-      return assign();
-    }
-
-
-    //! Take a snapshot of the current screen content.
-    /**
-       \param x0 X-coordinate of the upper left corner.
-       \param y0 Y-coordinate of the upper left corner.
-       \param x1 X-coordinate of the lower right corner.
-       \param y1 Y-coordinate of the lower right corner.
-       \param[out] img Output screenshot. Can be empty on input
-    **/
-    template<typename T>
-    static void screenshot(const int x0, const int y0, const int x1, const int y1, CImg<T>& img) {
-      cimg::unused(x0,y0,x1,y1,&img);
-      _no_display_exception();
-    }
-
-    //! Take a snapshot of the associated window content.
-    /**
-       \param[out] img Output snapshot. Can be empty on input.
-    **/
-    template<typename T>
-    const CImgDisplay& snapshot(CImg<T>& img) const {
-      cimg::unused(img);
-      _no_display_exception();
-      return *this;
-    }
-#endif
-
-    // X11-based implementation
-    //--------------------------
-#if cimg_display==1
-
-    Atom _wm_window_atom, _wm_protocol_atom;
-    Window _window, _background_window;
-    Colormap _colormap;
-    XImage *_image;
-    void *_data;
-#ifdef cimg_use_xshm
-    XShmSegmentInfo *_shminfo;
-#endif
-
-    static int screen_width() {
-      Display *const dpy = cimg::X11_attr().display;
-      int res = 0;
-      if (!dpy) {
-        Display *const _dpy = XOpenDisplay(0);
-        if (!_dpy)
-          throw CImgDisplayException("CImgDisplay::screen_width(): Failed to open X11 display.");
-        res = DisplayWidth(_dpy,DefaultScreen(_dpy));
-        XCloseDisplay(_dpy);
-      } else {
-#ifdef cimg_use_xrandr
-        if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution)
-          res = cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].width;
-        else res = DisplayWidth(dpy,DefaultScreen(dpy));
-#else
-        res = DisplayWidth(dpy,DefaultScreen(dpy));
-#endif
-      }
-      return res;
-    }
-
-    static int screen_height() {
-      Display *const dpy = cimg::X11_attr().display;
-      int res = 0;
-      if (!dpy) {
-        Display *const _dpy = XOpenDisplay(0);
-        if (!_dpy)
-          throw CImgDisplayException("CImgDisplay::screen_height(): Failed to open X11 display.");
-        res = DisplayHeight(_dpy,DefaultScreen(_dpy));
-        XCloseDisplay(_dpy);
-      } else {
-#ifdef cimg_use_xrandr
-        if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution)
-          res = cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].height;
-        else res = DisplayHeight(dpy,DefaultScreen(dpy));
-#else
-        res = DisplayHeight(dpy,DefaultScreen(dpy));
-#endif
-      }
-      return res;
-    }
-
-    static void wait_all() {
-      if (!cimg::X11_attr().display) return;
-      pthread_mutex_lock(&cimg::X11_attr().wait_event_mutex);
-      pthread_cond_wait(&cimg::X11_attr().wait_event,&cimg::X11_attr().wait_event_mutex);
-      pthread_mutex_unlock(&cimg::X11_attr().wait_event_mutex);
-    }
-
-    void _handle_events(const XEvent *const pevent) {
-      Display *const dpy = cimg::X11_attr().display;
-      XEvent event = *pevent;
-      switch (event.type) {
-      case ClientMessage : {
-        if ((int)event.xclient.message_type==(int)_wm_protocol_atom &&
-            (int)event.xclient.data.l[0]==(int)_wm_window_atom) {
-          XUnmapWindow(cimg::X11_attr().display,_window);
-          _is_closed = _is_event = true;
-          pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-        }
-      } break;
-      case ConfigureNotify : {
-        while (XCheckWindowEvent(dpy,_window,StructureNotifyMask,&event)) {}
-        const unsigned int nw = event.xconfigure.width, nh = event.xconfigure.height;
-        const int nx = event.xconfigure.x, ny = event.xconfigure.y;
-        if (nw && nh && (nw!=_window_width || nh!=_window_height)) {
-          _window_width = nw; _window_height = nh; _mouse_x = _mouse_y = -1;
-          XResizeWindow(dpy,_window,_window_width,_window_height);
-          _is_resized = _is_event = true;
-          pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-        }
-        if (nx!=_window_x || ny!=_window_y) {
-          _window_x = nx; _window_y = ny; _is_moved = _is_event = true;
-          pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-        }
-      } break;
-      case Expose : {
-        while (XCheckWindowEvent(dpy,_window,ExposureMask,&event)) {}
-        _paint(false);
-        if (_is_fullscreen) {
-          XWindowAttributes attr;
-          XGetWindowAttributes(dpy,_window,&attr);
-          while (attr.map_state!=IsViewable) XSync(dpy,0);
-          XSetInputFocus(dpy,_window,RevertToParent,CurrentTime);
-        }
-      } break;
-      case ButtonPress : {
-        do {
-          _mouse_x = event.xmotion.x; _mouse_y = event.xmotion.y;
-          if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
-          switch (event.xbutton.button) {
-          case 1 : set_button(1); break;
-          case 3 : set_button(2); break;
-          case 2 : set_button(3); break;
-          }
-        } while (XCheckWindowEvent(dpy,_window,ButtonPressMask,&event));
-      } break;
-      case ButtonRelease : {
-        do {
-          _mouse_x = event.xmotion.x; _mouse_y = event.xmotion.y;
-          if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
-          switch (event.xbutton.button) {
-          case 1 : set_button(1,false); break;
-          case 3 : set_button(2,false); break;
-          case 2 : set_button(3,false); break;
-          case 4 : set_wheel(1); break;
-          case 5 : set_wheel(-1); break;
-          }
-        } while (XCheckWindowEvent(dpy,_window,ButtonReleaseMask,&event));
-      } break;
-      case KeyPress : {
-        char tmp = 0; KeySym ksym;
-        XLookupString(&event.xkey,&tmp,1,&ksym,0);
-        set_key((unsigned int)ksym,true);
-      } break;
-      case KeyRelease : {
-        char keys_return[32];  // Check that the key has been physically unpressed.
-        XQueryKeymap(dpy,keys_return);
-        const unsigned int kc = event.xkey.keycode, kc1 = kc/8, kc2 = kc%8;
-        const bool is_key_pressed = kc1>=32?false:(keys_return[kc1]>>kc2)&1;
-        if (!is_key_pressed) {
-          char tmp = 0; KeySym ksym;
-          XLookupString(&event.xkey,&tmp,1,&ksym,0);
-          set_key((unsigned int)ksym,false);
-        }
-      } break;
-      case EnterNotify: {
-        while (XCheckWindowEvent(dpy,_window,EnterWindowMask,&event)) {}
-        _mouse_x = event.xmotion.x;
-        _mouse_y = event.xmotion.y;
-        if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
-      } break;
-      case LeaveNotify : {
-        while (XCheckWindowEvent(dpy,_window,LeaveWindowMask,&event)) {}
-        _mouse_x = _mouse_y = -1; _is_event = true;
-        pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-      } break;
-      case MotionNotify : {
-        while (XCheckWindowEvent(dpy,_window,PointerMotionMask,&event)) {}
-        _mouse_x = event.xmotion.x;
-        _mouse_y = event.xmotion.y;
-        if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
-        _is_event = true;
-        pthread_cond_broadcast(&cimg::X11_attr().wait_event);
-      } break;
-      }
-    }
-
-    static void* _events_thread(void *arg) { // Thread to manage events for all opened display windows.
-      Display *const dpy = cimg::X11_attr().display;
-      XEvent event;
-      pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED,0);
-      pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,0);
-      if (!arg) for ( ; ; ) {
-        cimg_lock_display();
-        bool event_flag = XCheckTypedEvent(dpy,ClientMessage,&event);
-        if (!event_flag) event_flag = XCheckMaskEvent(dpy,
-                                                      ExposureMask | StructureNotifyMask | ButtonPressMask |
-                                                      KeyPressMask | PointerMotionMask | EnterWindowMask |
-                                                      LeaveWindowMask | ButtonReleaseMask | KeyReleaseMask,&event);
-        if (event_flag)
-          for (unsigned int i = 0; i<cimg::X11_attr().nb_wins; ++i)
-            if (!cimg::X11_attr().wins[i]->_is_closed && event.xany.window==cimg::X11_attr().wins[i]->_window)
-              cimg::X11_attr().wins[i]->_handle_events(&event);
-        cimg_unlock_display();
-        pthread_testcancel();
-        cimg::sleep(8);
-      }
-      return 0;
-    }
-
-    void _set_colormap(Colormap& _colormap, const unsigned int dim) {
-      XColor *const colormap = new XColor[256];
-      switch (dim) {
-      case 1 : { // colormap for greyscale images
-        for (unsigned int index = 0; index<256; ++index) {
-          colormap[index].pixel = index;
-          colormap[index].red = colormap[index].green = colormap[index].blue = (unsigned short)(index<<8);
-          colormap[index].flags = DoRed | DoGreen | DoBlue;
-        }
-      } break;
-      case 2 : { // colormap for RG images
-        for (unsigned int index = 0, r = 8; r<256; r+=16)
-          for (unsigned int g = 8; g<256; g+=16) {
-            colormap[index].pixel = index;
-            colormap[index].red = colormap[index].blue = (unsigned short)(r<<8);
-            colormap[index].green = (unsigned short)(g<<8);
-            colormap[index++].flags = DoRed | DoGreen | DoBlue;
-          }
-      } break;
-      default : { // colormap for RGB images
-        for (unsigned int index = 0, r = 16; r<256; r+=32)
-          for (unsigned int g = 16; g<256; g+=32)
-            for (unsigned int b = 32; b<256; b+=64) {
-              colormap[index].pixel = index;
-              colormap[index].red = (unsigned short)(r<<8);
-              colormap[index].green = (unsigned short)(g<<8);
-              colormap[index].blue = (unsigned short)(b<<8);
-              colormap[index++].flags = DoRed | DoGreen | DoBlue;
-            }
-      }
-      }
-      XStoreColors(cimg::X11_attr().display,_colormap,colormap,256);
-      delete[] colormap;
-    }
-
-    void _map_window() {
-      Display *const dpy = cimg::X11_attr().display;
-      bool is_exposed = false, is_mapped = false;
-      XWindowAttributes attr;
-      XEvent event;
-      XMapRaised(dpy,_window);
-      do { // Wait for the window to be mapped.
-        XWindowEvent(dpy,_window,StructureNotifyMask | ExposureMask,&event);
-        switch (event.type) {
-        case MapNotify : is_mapped = true; break;
-        case Expose : is_exposed = true; break;
-        }
-      } while (!is_exposed || !is_mapped);
-      do { // Wait for the window to be visible.
-        XGetWindowAttributes(dpy,_window,&attr);
-        if (attr.map_state!=IsViewable) { XSync(dpy,0); cimg::sleep(10); }
-      } while (attr.map_state!=IsViewable);
-      _window_x = attr.x;
-      _window_y = attr.y;
-    }
-
-    void _paint(const bool wait_expose=true) {
-      if (_is_closed || !_image) return;
-      Display *const dpy = cimg::X11_attr().display;
-      if (wait_expose) { // Send an expose event sticked to display window to force repaint.
-        XEvent event;
-        event.xexpose.type = Expose;
-        event.xexpose.serial = 0;
-        event.xexpose.send_event = 1;
-        event.xexpose.display = dpy;
-        event.xexpose.window = _window;
-        event.xexpose.x = 0;
-        event.xexpose.y = 0;
-        event.xexpose.width = width();
-        event.xexpose.height = height();
-        event.xexpose.count = 0;
-        XSendEvent(dpy,_window,0,0,&event);
-      } else { // Repaint directly (may be called from the expose event).
-        GC gc = DefaultGC(dpy,DefaultScreen(dpy));
-#ifdef cimg_use_xshm
-        if (_shminfo) XShmPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height,1);
-        else XPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height);
-#else
-        XPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height);
-#endif
-      }
-    }
-
-    template<typename T>
-    void _resize(T pixel_type, const unsigned int ndimx, const unsigned int ndimy, const bool force_redraw) {
-      Display *const dpy = cimg::X11_attr().display;
-      cimg::unused(pixel_type);
-
-#ifdef cimg_use_xshm
-      if (_shminfo) {
-        XShmSegmentInfo *const nshminfo = new XShmSegmentInfo;
-        XImage *const nimage = XShmCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),
-                                               cimg::X11_attr().nb_bits,ZPixmap,0,nshminfo,ndimx,ndimy);
-        if (!nimage) { delete nshminfo; return; }
-        else {
-          nshminfo->shmid = shmget(IPC_PRIVATE,ndimx*ndimy*sizeof(T),IPC_CREAT | 0777);
-          if (nshminfo->shmid==-1) { XDestroyImage(nimage); delete nshminfo; return; }
-          else {
-            nshminfo->shmaddr = nimage->data = (char*)shmat(nshminfo->shmid,0,0);
-            if (nshminfo->shmaddr==(char*)-1) {
-              shmctl(nshminfo->shmid,IPC_RMID,0); XDestroyImage(nimage); delete nshminfo; return;
-            } else {
-              nshminfo->readOnly = 0;
-              cimg::X11_attr().is_shm_enabled = true;
-              XErrorHandler oldXErrorHandler = XSetErrorHandler(_assign_xshm);
-              XShmAttach(dpy,nshminfo);
-              XFlush(dpy);
-              XSetErrorHandler(oldXErrorHandler);
-              if (!cimg::X11_attr().is_shm_enabled) {
-                shmdt(nshminfo->shmaddr);
-                shmctl(nshminfo->shmid,IPC_RMID,0);
-                XDestroyImage(nimage);
-                delete nshminfo;
-                return;
-              } else {
-                T *const ndata = (T*)nimage->data;
-                if (force_redraw) _render_resize((T*)_data,_width,_height,ndata,ndimx,ndimy);
-                else std::memset(ndata,0,sizeof(T)*ndimx*ndimy);
-                XShmDetach(dpy,_shminfo);
-                XDestroyImage(_image);
-                shmdt(_shminfo->shmaddr);
-                shmctl(_shminfo->shmid,IPC_RMID,0);
-                delete _shminfo;
-                _shminfo = nshminfo;
-                _image = nimage;
-                _data = (void*)ndata;
-              }
-            }
-          }
-        }
-      } else
-#endif
-        {
-          T *ndata = (T*)std::malloc(ndimx*ndimy*sizeof(T));
-          if (force_redraw) _render_resize((T*)_data,_width,_height,ndata,ndimx,ndimy);
-          else std::memset(ndata,0,sizeof(T)*ndimx*ndimy);
-          _data = (void*)ndata;
-          XDestroyImage(_image);
-          _image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),
-                                cimg::X11_attr().nb_bits,ZPixmap,0,(char*)_data,ndimx,ndimy,8,0);
-        }
-    }
-
-    void _init_fullscreen() {
-      if (!_is_fullscreen || _is_closed) return;
-      Display *const dpy = cimg::X11_attr().display;
-      _background_window = 0;
-
-#ifdef cimg_use_xrandr
-      int foo;
-      if (XRRQueryExtension(dpy,&foo,&foo)) {
-        XRRRotations(dpy,DefaultScreen(dpy),&cimg::X11_attr().curr_rotation);
-        if (!cimg::X11_attr().resolutions) {
-          cimg::X11_attr().resolutions = XRRSizes(dpy,DefaultScreen(dpy),&foo);
-          cimg::X11_attr().nb_resolutions = (unsigned int)foo;
-        }
-        if (cimg::X11_attr().resolutions) {
-          cimg::X11_attr().curr_resolution = 0;
-          for (unsigned int i = 0; i<cimg::X11_attr().nb_resolutions; ++i) {
-            const unsigned int
-              nw = (unsigned int)(cimg::X11_attr().resolutions[i].width),
-              nh = (unsigned int)(cimg::X11_attr().resolutions[i].height);
-            if (nw>=_width && nh>=_height &&
-                nw<=(unsigned int)(cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].width) &&
-                nh<=(unsigned int)(cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].height))
-              cimg::X11_attr().curr_resolution = i;
-          }
-          if (cimg::X11_attr().curr_resolution>0) {
-            XRRScreenConfiguration *config = XRRGetScreenInfo(dpy,DefaultRootWindow(dpy));
-            XRRSetScreenConfig(dpy,config,DefaultRootWindow(dpy),
-                               cimg::X11_attr().curr_resolution,cimg::X11_attr().curr_rotation,CurrentTime);
-            XRRFreeScreenConfigInfo(config);
-            XSync(dpy,0);
-          }
-        }
-      }
-      if (!cimg::X11_attr().resolutions)
-        cimg::warn(_cimgdisplay_instance
-                   "init_fullscreen(): Xrandr extension not supported by the X server.",
-                   cimgdisplay_instance);
-#endif
-
-      const unsigned int sx = screen_width(), sy = screen_height();
-      if (sx==_width && sy==_height) return;
-      XSetWindowAttributes winattr;
-      winattr.override_redirect = 1;
-      _background_window = XCreateWindow(dpy,DefaultRootWindow(dpy),0,0,sx,sy,0,0,
-                                         InputOutput,CopyFromParent,CWOverrideRedirect,&winattr);
-      const cimg_ulong buf_size = (cimg_ulong)sx*sy*(cimg::X11_attr().nb_bits==8?1:
-                                                     (cimg::X11_attr().nb_bits==16?2:4));
-      void *background_data = std::malloc(buf_size);
-      std::memset(background_data,0,buf_size);
-      XImage *background_image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,
-                                              ZPixmap,0,(char*)background_data,sx,sy,8,0);
-      XEvent event;
-      XSelectInput(dpy,_background_window,StructureNotifyMask);
-      XMapRaised(dpy,_background_window);
-      do XWindowEvent(dpy,_background_window,StructureNotifyMask,&event);
-      while (event.type!=MapNotify);
-      GC gc = DefaultGC(dpy,DefaultScreen(dpy));
-#ifdef cimg_use_xshm
-      if (_shminfo) XShmPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy,0);
-      else XPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy);
-#else
-      XPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy);
-#endif
-      XWindowAttributes attr;
-      XGetWindowAttributes(dpy,_background_window,&attr);
-      while (attr.map_state!=IsViewable) XSync(dpy,0);
-      XDestroyImage(background_image);
-    }
-
-    void _desinit_fullscreen() {
-      if (!_is_fullscreen) return;
-      Display *const dpy = cimg::X11_attr().display;
-      XUngrabKeyboard(dpy,CurrentTime);
-#ifdef cimg_use_xrandr
-      if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution) {
-        XRRScreenConfiguration *config = XRRGetScreenInfo(dpy,DefaultRootWindow(dpy));
-        XRRSetScreenConfig(dpy,config,DefaultRootWindow(dpy),0,cimg::X11_attr().curr_rotation,CurrentTime);
-        XRRFreeScreenConfigInfo(config);
-        XSync(dpy,0);
-        cimg::X11_attr().curr_resolution = 0;
-      }
-#endif
-      if (_background_window) XDestroyWindow(dpy,_background_window);
-      _background_window = 0;
-      _is_fullscreen = false;
-    }
-
-    static int _assign_xshm(Display *dpy, XErrorEvent *error) {
-      cimg::unused(dpy,error);
-      cimg::X11_attr().is_shm_enabled = false;
-      return 0;
-    }
-
-    void _assign(const unsigned int dimw, const unsigned int dimh, const char *const ptitle=0,
-                 const unsigned int normalization_type=3,
-                 const bool fullscreen_flag=false, const bool closed_flag=false) {
-      cimg::mutex(14);
-
-      // Allocate space for window title
-      const char *const nptitle = ptitle?ptitle:"";
-      const unsigned int s = (unsigned int)std::strlen(nptitle) + 1;
-      char *const tmp_title = s?new char[s]:0;
-      if (s) std::memcpy(tmp_title,nptitle,s*sizeof(char));
-
-      // Destroy previous display window if existing
-      if (!is_empty()) assign();
-
-      // Open X11 display and retrieve graphical properties.
-      Display* &dpy = cimg::X11_attr().display;
-      if (!dpy) {
-        dpy = XOpenDisplay(0);
-        if (!dpy)
-          throw CImgDisplayException(_cimgdisplay_instance
-                                     "assign(): Failed to open X11 display.",
-                                     cimgdisplay_instance);
-
-        cimg::X11_attr().nb_bits = DefaultDepth(dpy,DefaultScreen(dpy));
-        if (cimg::X11_attr().nb_bits!=8 && cimg::X11_attr().nb_bits!=16 &&
-            cimg::X11_attr().nb_bits!=24 && cimg::X11_attr().nb_bits!=32)
-          throw CImgDisplayException(_cimgdisplay_instance
-                                     "assign(): Invalid %u bits screen mode detected "
-                                     "(only 8, 16, 24 and 32 bits modes are managed).",
-                                     cimgdisplay_instance,
-                                     cimg::X11_attr().nb_bits);
-        XVisualInfo vtemplate;
-        vtemplate.visualid = XVisualIDFromVisual(DefaultVisual(dpy,DefaultScreen(dpy)));
-        int nb_visuals;
-        XVisualInfo *vinfo = XGetVisualInfo(dpy,VisualIDMask,&vtemplate,&nb_visuals);
-        if (vinfo && vinfo->red_mask<vinfo->blue_mask) cimg::X11_attr().is_blue_first = true;
-        cimg::X11_attr().byte_order = ImageByteOrder(dpy);
-        XFree(vinfo);
-
-        cimg_lock_display();
-        cimg::X11_attr().events_thread = new pthread_t;
-        pthread_create(cimg::X11_attr().events_thread,0,_events_thread,0);
-      } else cimg_lock_display();
-
-      // Set display variables.
-      _width = std::min(dimw,(unsigned int)screen_width());
-      _height = std::min(dimh,(unsigned int)screen_height());
-      _normalization = normalization_type<4?normalization_type:3;
-      _is_fullscreen = fullscreen_flag;
-      _window_x = _window_y = 0;
-      _is_closed = closed_flag;
-      _title = tmp_title;
-      flush();
-
-      // Create X11 window (and LUT, if 8bits display)
-      if (_is_fullscreen) {
-        if (!_is_closed) _init_fullscreen();
-        const unsigned int sx = screen_width(), sy = screen_height();
-        XSetWindowAttributes winattr;
-        winattr.override_redirect = 1;
-        _window = XCreateWindow(dpy,DefaultRootWindow(dpy),(sx - _width)/2,(sy - _height)/2,_width,_height,0,0,
-                                InputOutput,CopyFromParent,CWOverrideRedirect,&winattr);
-      } else
-        _window = XCreateSimpleWindow(dpy,DefaultRootWindow(dpy),0,0,_width,_height,0,0L,0L);
-
-      XSelectInput(dpy,_window,
-                   ExposureMask | StructureNotifyMask | ButtonPressMask | KeyPressMask | PointerMotionMask |
-                   EnterWindowMask | LeaveWindowMask | ButtonReleaseMask | KeyReleaseMask);
-
-      XStoreName(dpy,_window,_title?_title:" ");
-      if (cimg::X11_attr().nb_bits==8) {
-        _colormap = XCreateColormap(dpy,_window,DefaultVisual(dpy,DefaultScreen(dpy)),AllocAll);
-        _set_colormap(_colormap,3);
-        XSetWindowColormap(dpy,_window,_colormap);
-      }
-
-      static const char *const _window_class = cimg_appname;
-      XClassHint *const window_class = XAllocClassHint();
-      window_class->res_name = (char*)_window_class;
-      window_class->res_class = (char*)_window_class;
-      XSetClassHint(dpy,_window,window_class);
-      XFree(window_class);
-
-      _window_width = _width;
-      _window_height = _height;
-
-      // Create XImage
-#ifdef cimg_use_xshm
-      _shminfo = 0;
-      if (XShmQueryExtension(dpy)) {
-        _shminfo = new XShmSegmentInfo;
-        _image = XShmCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,
-                                 ZPixmap,0,_shminfo,_width,_height);
-        if (!_image) { delete _shminfo; _shminfo = 0; }
-        else {
-          _shminfo->shmid = shmget(IPC_PRIVATE,_image->bytes_per_line*_image->height,IPC_CREAT|0777);
-          if (_shminfo->shmid==-1) { XDestroyImage(_image); delete _shminfo; _shminfo = 0; }
-          else {
-            _shminfo->shmaddr = _image->data = (char*)(_data = shmat(_shminfo->shmid,0,0));
-            if (_shminfo->shmaddr==(char*)-1) {
-              shmctl(_shminfo->shmid,IPC_RMID,0); XDestroyImage(_image); delete _shminfo; _shminfo = 0;
-            } else {
-              _shminfo->readOnly = 0;
-              cimg::X11_attr().is_shm_enabled = true;
-              XErrorHandler oldXErrorHandler = XSetErrorHandler(_assign_xshm);
-              XShmAttach(dpy,_shminfo);
-              XSync(dpy,0);
-              XSetErrorHandler(oldXErrorHandler);
-              if (!cimg::X11_attr().is_shm_enabled) {
-                shmdt(_shminfo->shmaddr); shmctl(_shminfo->shmid,IPC_RMID,0); XDestroyImage(_image);
-                delete _shminfo; _shminfo = 0;
-              }
-            }
-          }
-        }
-      }
-      if (!_shminfo)
-#endif
-        {
-          const cimg_ulong buf_size = (cimg_ulong)_width*_height*(cimg::X11_attr().nb_bits==8?1:
-                                                                  (cimg::X11_attr().nb_bits==16?2:4));
-          _data = std::malloc(buf_size);
-          _image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,
-                                ZPixmap,0,(char*)_data,_width,_height,8,0);
-        }
-
-      _wm_window_atom = XInternAtom(dpy,"WM_DELETE_WINDOW",0);
-      _wm_protocol_atom = XInternAtom(dpy,"WM_PROTOCOLS",0);
-      XSetWMProtocols(dpy,_window,&_wm_window_atom,1);
-
-      if (_is_fullscreen) XGrabKeyboard(dpy,_window,1,GrabModeAsync,GrabModeAsync,CurrentTime);
-      cimg::X11_attr().wins[cimg::X11_attr().nb_wins++]=this;
-      if (!_is_closed) _map_window(); else { _window_x = _window_y = cimg::type<int>::min(); }
-      cimg_unlock_display();
-      cimg::mutex(14,0);
-    }
-
-    CImgDisplay& assign() {
-      if (is_empty()) return flush();
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-
-      // Remove display window from event thread list.
-      unsigned int i;
-      for (i = 0; i<cimg::X11_attr().nb_wins && cimg::X11_attr().wins[i]!=this; ++i) {}
-      for ( ; i<cimg::X11_attr().nb_wins - 1; ++i) cimg::X11_attr().wins[i] = cimg::X11_attr().wins[i + 1];
-      --cimg::X11_attr().nb_wins;
-
-      // Destroy window, image, colormap and title.
-      if (_is_fullscreen && !_is_closed) _desinit_fullscreen();
-      XDestroyWindow(dpy,_window);
-      _window = 0;
-#ifdef cimg_use_xshm
-      if (_shminfo) {
-        XShmDetach(dpy,_shminfo);
-        XDestroyImage(_image);
-        shmdt(_shminfo->shmaddr);
-        shmctl(_shminfo->shmid,IPC_RMID,0);
-        delete _shminfo;
-        _shminfo = 0;
-      } else
-#endif
-        XDestroyImage(_image);
-      _data = 0; _image = 0;
-      if (cimg::X11_attr().nb_bits==8) XFreeColormap(dpy,_colormap);
-      _colormap = 0;
-      XSync(dpy,0);
-
-      // Reset display variables.
-      delete[] _title;
-      _width = _height = _normalization = _window_width = _window_height = 0;
-      _window_x = _window_y = 0;
-      _is_fullscreen = false;
-      _is_closed = true;
-      _min = _max = 0;
-      _title = 0;
-      flush();
-
-      cimg_unlock_display();
-      return *this;
-    }
-
-    CImgDisplay& assign(const unsigned int dimw, const unsigned int dimh, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!dimw || !dimh) return assign();
-      _assign(dimw,dimh,title,normalization_type,fullscreen_flag,closed_flag);
-      _min = _max = 0;
-      std::memset(_data,0,(cimg::X11_attr().nb_bits==8?sizeof(unsigned char):
-                           (cimg::X11_attr().nb_bits==16?sizeof(unsigned short):sizeof(unsigned int)))*
-                  (size_t)_width*_height);
-      return paint();
-    }
-
-    template<typename T>
-    CImgDisplay& assign(const CImg<T>& img, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!img) return assign();
-      CImg<T> tmp;
-      const CImg<T>& nimg = (img._depth==1)?img:(tmp=img.get_projections2d((img._width - 1)/2,
-                                                                           (img._height - 1)/2,
-                                                                           (img._depth - 1)/2));
-      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
-      if (_normalization==2) _min = (float)nimg.min_max(_max);
-      return render(nimg).paint();
-    }
-
-    template<typename T>
-    CImgDisplay& assign(const CImgList<T>& list, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!list) return assign();
-      CImg<T> tmp;
-      const CImg<T> img = list>'x', &nimg = (img._depth==1)?img:(tmp=img.get_projections2d((img._width - 1)/2,
-                                                                                           (img._height - 1)/2,
-                                                                                           (img._depth - 1)/2));
-      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
-      if (_normalization==2) _min = (float)nimg.min_max(_max);
-      return render(nimg).paint();
-    }
-
-    CImgDisplay& assign(const CImgDisplay& disp) {
-      if (!disp) return assign();
-      _assign(disp._width,disp._height,disp._title,disp._normalization,disp._is_fullscreen,disp._is_closed);
-      std::memcpy(_data,disp._data,(cimg::X11_attr().nb_bits==8?sizeof(unsigned char):
-                                    cimg::X11_attr().nb_bits==16?sizeof(unsigned short):
-                                    sizeof(unsigned int))*(size_t)_width*_height);
-      return paint();
-    }
-
-    CImgDisplay& resize(const int nwidth, const int nheight, const bool force_redraw=true) {
-      if (!nwidth || !nheight || (is_empty() && (nwidth<0 || nheight<0))) return assign();
-      if (is_empty()) return assign(nwidth,nheight);
-      Display *const dpy = cimg::X11_attr().display;
-      const unsigned int
-        tmpdimx = (nwidth>0)?nwidth:(-nwidth*width()/100),
-        tmpdimy = (nheight>0)?nheight:(-nheight*height()/100),
-        dimx = tmpdimx?tmpdimx:1,
-        dimy = tmpdimy?tmpdimy:1;
-      if (_width!=dimx || _height!=dimy || _window_width!=dimx || _window_height!=dimy) {
-        show();
-        cimg_lock_display();
-        if (_window_width!=dimx || _window_height!=dimy) {
-          XWindowAttributes attr;
-          for (unsigned int i = 0; i<10; ++i) {
-            XResizeWindow(dpy,_window,dimx,dimy);
-            XGetWindowAttributes(dpy,_window,&attr);
-            if (attr.width==(int)dimx && attr.height==(int)dimy) break;
-            cimg::wait(5);
-          }
-        }
-        if (_width!=dimx || _height!=dimy) switch (cimg::X11_attr().nb_bits) {
-          case 8 :  { unsigned char pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); } break;
-          case 16 : { unsigned short pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); } break;
-          default : { unsigned int pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); }
-          }
-        _window_width = _width = dimx; _window_height = _height = dimy;
-        cimg_unlock_display();
-      }
-      _is_resized = false;
-      if (_is_fullscreen) move((screen_width() - _width)/2,(screen_height() - _height)/2);
-      if (force_redraw) return paint();
-      return *this;
-    }
-
-    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
-      if (is_empty()) return *this;
-      if (force_redraw) {
-        const cimg_ulong buf_size = (cimg_ulong)_width*_height*
-          (cimg::X11_attr().nb_bits==8?1:(cimg::X11_attr().nb_bits==16?2:4));
-        void *image_data = std::malloc(buf_size);
-        std::memcpy(image_data,_data,buf_size);
-        assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
-        std::memcpy(_data,image_data,buf_size);
-        std::free(image_data);
-        return paint();
-      }
-      return assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
-    }
-
-    CImgDisplay& show() {
-      if (is_empty() || !_is_closed) return *this;
-      cimg_lock_display();
-      if (_is_fullscreen) _init_fullscreen();
-      _map_window();
-      _is_closed = false;
-      cimg_unlock_display();
-      return paint();
-    }
-
-    CImgDisplay& close() {
-      if (is_empty() || _is_closed) return *this;
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      if (_is_fullscreen) _desinit_fullscreen();
-      XUnmapWindow(dpy,_window);
-      _window_x = _window_y = -1;
-      _is_closed = true;
-      cimg_unlock_display();
-      return *this;
-    }
-
-    CImgDisplay& move(const int posx, const int posy) {
-      if (is_empty()) return *this;
-      if (_window_x!=posx || _window_y!=posy) {
-        show();
-        Display *const dpy = cimg::X11_attr().display;
-        cimg_lock_display();
-        XMoveWindow(dpy,_window,posx,posy);
-        _window_x = posx; _window_y = posy;
-        cimg_unlock_display();
-      }
-      _is_moved = false;
-      return paint();
-    }
-
-    CImgDisplay& show_mouse() {
-      if (is_empty()) return *this;
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      XUndefineCursor(dpy,_window);
-      cimg_unlock_display();
-      return *this;
-    }
-
-    CImgDisplay& hide_mouse() {
-      if (is_empty()) return *this;
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      static const char pix_data[8] = { 0 };
-      XColor col;
-      col.red = col.green = col.blue = 0;
-      Pixmap pix = XCreateBitmapFromData(dpy,_window,pix_data,8,8);
-      Cursor cur = XCreatePixmapCursor(dpy,pix,pix,&col,&col,0,0);
-      XFreePixmap(dpy,pix);
-      XDefineCursor(dpy,_window,cur);
-      cimg_unlock_display();
-      return *this;
-    }
-
-    CImgDisplay& set_mouse(const int posx, const int posy) {
-      if (is_empty() || _is_closed) return *this;
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      XWarpPointer(dpy,0L,_window,0,0,0,0,posx,posy);
-      _mouse_x = posx; _mouse_y = posy;
-      _is_moved = false;
-      XSync(dpy,0);
-      cimg_unlock_display();
-      return *this;
-    }
-
-    CImgDisplay& set_title(const char *const format, ...) {
-      if (is_empty()) return *this;
-      char *const tmp = new char[1024];
-      va_list ap;
-      va_start(ap, format);
-      cimg_vsnprintf(tmp,1024,format,ap);
-      va_end(ap);
-      if (!std::strcmp(_title,tmp)) { delete[] tmp; return *this; }
-      delete[] _title;
-      const unsigned int s = (unsigned int)std::strlen(tmp) + 1;
-      _title = new char[s];
-      std::memcpy(_title,tmp,s*sizeof(char));
-      Display *const dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      XStoreName(dpy,_window,tmp);
-      cimg_unlock_display();
-      delete[] tmp;
-      return *this;
-    }
-
-    template<typename T>
-    CImgDisplay& display(const CImg<T>& img) {
-      if (!img)
-        throw CImgArgumentException(_cimgdisplay_instance
-                                    "display(): Empty specified image.",
-                                    cimgdisplay_instance);
-      if (is_empty()) return assign(img);
-      return render(img).paint(false);
-    }
-
-    CImgDisplay& paint(const bool wait_expose=true) {
-      if (is_empty()) return *this;
-      cimg_lock_display();
-      _paint(wait_expose);
-      cimg_unlock_display();
-      return *this;
-    }
-
-    template<typename T>
-    CImgDisplay& render(const CImg<T>& img, const bool flag8=false) {
-      if (!img)
-        throw CImgArgumentException(_cimgdisplay_instance
-                                    "render(): Empty specified image.",
-                                    cimgdisplay_instance);
-      if (is_empty()) return *this;
-      if (img._depth!=1) return render(img.get_projections2d((img._width - 1)/2,(img._height - 1)/2,
-                                                             (img._depth - 1)/2));
-      if (cimg::X11_attr().nb_bits==8 && (img._width!=_width || img._height!=_height))
-        return render(img.get_resize(_width,_height,1,-100,1));
-      if (cimg::X11_attr().nb_bits==8 && !flag8 && img._spectrum==3) {
-        static const CImg<typename CImg<T>::ucharT> default_colormap = CImg<typename CImg<T>::ucharT>::default_LUT256();
-        return render(img.get_index(default_colormap,1,false));
-      }
-
-      const T
-        *data1 = img._data,
-        *data2 = (img._spectrum>1)?img.data(0,0,0,1):data1,
-        *data3 = (img._spectrum>2)?img.data(0,0,0,2):data1;
-
-      if (cimg::X11_attr().is_blue_first) cimg::swap(data1,data3);
-      cimg_lock_display();
-
-      if (!_normalization || (_normalization==3 && cimg::type<T>::string()==cimg::type<unsigned char>::string())) {
-        _min = _max = 0;
-        switch (cimg::X11_attr().nb_bits) {
-        case 8 : { // 256 colormap, no normalization
-          _set_colormap(_colormap,img._spectrum);
-          unsigned char
-            *const ndata = (img._width==_width && img._height==_height)?(unsigned char*)_data:
-            new unsigned char[(size_t)img._width*img._height],
-            *ptrd = (unsigned char*)ndata;
-          switch (img._spectrum) {
-          case 1 :
-            for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-              (*ptrd++) = (unsigned char)*(data1++);
-            break;
-          case 2 : for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-              const unsigned char
-                R = (unsigned char)*(data1++),
-                G = (unsigned char)*(data2++);
-              (*ptrd++) = (R&0xf0) | (G>>4);
-            } break;
-          default : for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-              const unsigned char
-                R = (unsigned char)*(data1++),
-                G = (unsigned char)*(data2++),
-                B = (unsigned char)*(data3++);
-              (*ptrd++) = (R&0xe0) | ((G>>5)<<2) | (B>>6);
-            }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned char*)_data,_width,_height);
-            delete[] ndata;
-          }
-        } break;
-        case 16 : { // 16 bits colors, no normalization
-          unsigned short *const ndata = (img._width==_width && img._height==_height)?(unsigned short*)_data:
-            new unsigned short[(size_t)img._width*img._height];
-          unsigned char *ptrd = (unsigned char*)ndata;
-          const unsigned int M = 248;
-          switch (img._spectrum) {
-          case 1 :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char val = (unsigned char)*(data1++), G = val>>2;
-                ptrd[0] = (val&M) | (G>>3);
-                ptrd[1] = (G<<5) | (G>>1);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char val = (unsigned char)*(data1++), G = val>>2;
-                ptrd[0] = (G<<5) | (G>>1);
-                ptrd[1] = (val&M) | (G>>3);
-                ptrd+=2;
-              }
-            break;
-          case 2 :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)*(data2++)>>2;
-                ptrd[0] = ((unsigned char)*(data1++)&M) | (G>>3);
-                ptrd[1] = (G<<5);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)*(data2++)>>2;
-                ptrd[0] = (G<<5);
-                ptrd[1] = ((unsigned char)*(data1++)&M) | (G>>3);
-                ptrd+=2;
-              }
-            break;
-          default :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)*(data2++)>>2;
-                ptrd[0] = ((unsigned char)*(data1++)&M) | (G>>3);
-                ptrd[1] = (G<<5) | ((unsigned char)*(data3++)>>3);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)*(data2++)>>2;
-                ptrd[0] = (G<<5) | ((unsigned char)*(data3++)>>3);
-                ptrd[1] = ((unsigned char)*(data1++)&M) | (G>>3);
-                ptrd+=2;
-              }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned short*)_data,_width,_height);
-            delete[] ndata;
-          }
-        } break;
-        default : { // 24 bits colors, no normalization
-          unsigned int *const ndata = (img._width==_width && img._height==_height)?(unsigned int*)_data:
-            new unsigned int[(size_t)img._width*img._height];
-          if (sizeof(int)==4) { // 32 bits int uses optimized version
-            unsigned int *ptrd = ndata;
-            switch (img._spectrum) {
-            case 1 :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  const unsigned char val = (unsigned char)*(data1++);
-                  *(ptrd++) = (val<<16) | (val<<8) | val;
-                }
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                 const unsigned char val = (unsigned char)*(data1++);
-                  *(ptrd++) = (val<<16) | (val<<8) | val;
-                }
-              break;
-            case 2 :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8);
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) = ((unsigned char)*(data2++)<<16) | ((unsigned char)*(data1++)<<8);
-              break;
-            default :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8) |
-                    (unsigned char)*(data3++);
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) = ((unsigned char)*(data3++)<<24) | ((unsigned char)*(data2++)<<16) |
-                    ((unsigned char)*(data1++)<<8);
-            }
-          } else {
-            unsigned char *ptrd = (unsigned char*)ndata;
-            switch (img._spectrum) {
-            case 1 :
-              if (cimg::X11_attr().byte_order)
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = 0;
-                  ptrd[1] = (unsigned char)*(data1++);
-                  ptrd[2] = 0;
-                  ptrd[3] = 0;
-                  ptrd+=4;
-                } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = 0;
-                  ptrd[1] = 0;
-                  ptrd[2] = (unsigned char)*(data1++);
-                  ptrd[3] = 0;
-                  ptrd+=4;
-                }
-              break;
-            case 2 :
-              if (cimg::X11_attr().byte_order) cimg::swap(data1,data2);
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                ptrd[0] = 0;
-                ptrd[1] = (unsigned char)*(data2++);
-                ptrd[2] = (unsigned char)*(data1++);
-                ptrd[3] = 0;
-                ptrd+=4;
-              }
-              break;
-            default :
-              if (cimg::X11_attr().byte_order)
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = 0;
-                  ptrd[1] = (unsigned char)*(data1++);
-                  ptrd[2] = (unsigned char)*(data2++);
-                  ptrd[3] = (unsigned char)*(data3++);
-                  ptrd+=4;
-                } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = (unsigned char)*(data3++);
-                  ptrd[1] = (unsigned char)*(data2++);
-                  ptrd[2] = (unsigned char)*(data1++);
-                  ptrd[3] = 0;
-                  ptrd+=4;
-                }
-            }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned int*)_data,_width,_height);
-            delete[] ndata;
-          }
-        }
-        }
-      } else {
-        if (_normalization==3) {
-          if (cimg::type<T>::is_float()) _min = (float)img.min_max(_max);
-          else { _min = (float)cimg::type<T>::min(); _max = (float)cimg::type<T>::max(); }
-        } else if ((_min>_max) || _normalization==1) _min = (float)img.min_max(_max);
-        const float delta = _max - _min, mm = 255/(delta?delta:1.0f);
-        switch (cimg::X11_attr().nb_bits) {
-        case 8 : { // 256 colormap, with normalization
-          _set_colormap(_colormap,img._spectrum);
-          unsigned char *const ndata = (img._width==_width && img._height==_height)?(unsigned char*)_data:
-            new unsigned char[(size_t)img._width*img._height];
-          unsigned char *ptrd = (unsigned char*)ndata;
-          switch (img._spectrum) {
-          case 1 : for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-              const unsigned char R = (unsigned char)((*(data1++) - _min)*mm);
-              *(ptrd++) = R;
-            } break;
-          case 2 : for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-              const unsigned char
-                R = (unsigned char)((*(data1++) - _min)*mm),
-                G = (unsigned char)((*(data2++) - _min)*mm);
-            (*ptrd++) = (R&0xf0) | (G>>4);
-          } break;
-          default :
-            for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-              const unsigned char
-                R = (unsigned char)((*(data1++) - _min)*mm),
-                G = (unsigned char)((*(data2++) - _min)*mm),
-                B = (unsigned char)((*(data3++) - _min)*mm);
-              *(ptrd++) = (R&0xe0) | ((G>>5)<<2) | (B>>6);
-            }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned char*)_data,_width,_height);
-            delete[] ndata;
-          }
-        } break;
-        case 16 : { // 16 bits colors, with normalization
-          unsigned short *const ndata = (img._width==_width && img._height==_height)?(unsigned short*)_data:
-            new unsigned short[(size_t)img._width*img._height];
-          unsigned char *ptrd = (unsigned char*)ndata;
-          const unsigned int M = 248;
-          switch (img._spectrum) {
-          case 1 :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char val = (unsigned char)((*(data1++) - _min)*mm), G = val>>2;
-                ptrd[0] = (val&M) | (G>>3);
-                ptrd[1] = (G<<5) | (val>>3);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char val = (unsigned char)((*(data1++) - _min)*mm), G = val>>2;
-                ptrd[0] = (G<<5) | (val>>3);
-                ptrd[1] = (val&M) | (G>>3);
-                ptrd+=2;
-              }
-            break;
-          case 2 :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)((*(data2++) - _min)*mm)>>2;
-                ptrd[0] = ((unsigned char)((*(data1++) - _min)*mm)&M) | (G>>3);
-                ptrd[1] = (G<<5);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)((*(data2++) - _min)*mm)>>2;
-                ptrd[0] = (G<<5);
-                ptrd[1] = ((unsigned char)((*(data1++) - _min)*mm)&M) | (G>>3);
-                ptrd+=2;
-              }
-            break;
-          default :
-            if (cimg::X11_attr().byte_order)
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)((*(data2++) - _min)*mm)>>2;
-                ptrd[0] = ((unsigned char)((*(data1++) - _min)*mm)&M) | (G>>3);
-                ptrd[1] = (G<<5) | ((unsigned char)((*(data3++) - _min)*mm)>>3);
-                ptrd+=2;
-              } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                const unsigned char G = (unsigned char)((*(data2++) - _min)*mm)>>2;
-                ptrd[0] = (G<<5) | ((unsigned char)((*(data3++) - _min)*mm)>>3);
-                ptrd[1] = ((unsigned char)((*(data1++) - _min)*mm)&M) | (G>>3);
-                ptrd+=2;
-              }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned short*)_data,_width,_height);
-            delete[] ndata;
-          }
-        } break;
-        default : { // 24 bits colors, with normalization
-          unsigned int *const ndata = (img._width==_width && img._height==_height)?(unsigned int*)_data:
-            new unsigned int[(size_t)img._width*img._height];
-          if (sizeof(int)==4) { // 32 bits int uses optimized version
-            unsigned int *ptrd = ndata;
-            switch (img._spectrum) {
-            case 1 :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  const unsigned char val = (unsigned char)((*(data1++) - _min)*mm);
-                  *(ptrd++) = (val<<16) | (val<<8) | val;
-                }
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  const unsigned char val = (unsigned char)((*(data1++) - _min)*mm);
-                  *(ptrd++) = (val<<24) | (val<<16) | (val<<8);
-                }
-              break;
-            case 2 :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) =
-                    ((unsigned char)((*(data1++) - _min)*mm)<<16) |
-                    ((unsigned char)((*(data2++) - _min)*mm)<<8);
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) =
-                    ((unsigned char)((*(data2++) - _min)*mm)<<16) |
-                    ((unsigned char)((*(data1++) - _min)*mm)<<8);
-              break;
-            default :
-              if (cimg::X11_attr().byte_order==cimg::endianness())
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) =
-                    ((unsigned char)((*(data1++) - _min)*mm)<<16) |
-                    ((unsigned char)((*(data2++) - _min)*mm)<<8) |
-                    (unsigned char)((*(data3++) - _min)*mm);
-              else
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy)
-                  *(ptrd++) =
-                    ((unsigned char)((*(data3++) - _min)*mm)<<24) |
-                    ((unsigned char)((*(data2++) - _min)*mm)<<16) |
-                    ((unsigned char)((*(data1++) - _min)*mm)<<8);
-            }
-          } else {
-            unsigned char *ptrd = (unsigned char*)ndata;
-            switch (img._spectrum) {
-            case 1 :
-              if (cimg::X11_attr().byte_order)
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  const unsigned char val = (unsigned char)((*(data1++) - _min)*mm);
-                  ptrd[0] = 0;
-                  ptrd[1] = val;
-                  ptrd[2] = val;
-                  ptrd[3] = val;
-                  ptrd+=4;
-                } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  const unsigned char val = (unsigned char)((*(data1++) - _min)*mm);
-                  ptrd[0] = val;
-                  ptrd[1] = val;
-                  ptrd[2] = val;
-                  ptrd[3] = 0;
-                  ptrd+=4;
-                }
-              break;
-            case 2 :
-              if (cimg::X11_attr().byte_order) cimg::swap(data1,data2);
-              for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                ptrd[0] = 0;
-                ptrd[1] = (unsigned char)((*(data2++) - _min)*mm);
-                ptrd[2] = (unsigned char)((*(data1++) - _min)*mm);
-                ptrd[3] = 0;
-                ptrd+=4;
-              }
-              break;
-            default :
-              if (cimg::X11_attr().byte_order)
-                for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = 0;
-                  ptrd[1] = (unsigned char)((*(data1++) - _min)*mm);
-                  ptrd[2] = (unsigned char)((*(data2++) - _min)*mm);
-                  ptrd[3] = (unsigned char)((*(data3++) - _min)*mm);
-                  ptrd+=4;
-                } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-                  ptrd[0] = (unsigned char)((*(data3++) - _min)*mm);
-                  ptrd[1] = (unsigned char)((*(data2++) - _min)*mm);
-                  ptrd[2] = (unsigned char)((*(data1++) - _min)*mm);
-                  ptrd[3] = 0;
-                  ptrd+=4;
-                }
-            }
-          }
-          if (ndata!=_data) {
-            _render_resize(ndata,img._width,img._height,(unsigned int*)_data,_width,_height);
-            delete[] ndata;
-          }
-        }
-        }
-      }
-      cimg_unlock_display();
-      return *this;
-    }
-
-    template<typename T>
-    static void screenshot(const int x0, const int y0, const int x1, const int y1, CImg<T>& img) {
-      img.assign();
-      Display *dpy = cimg::X11_attr().display;
-      cimg_lock_display();
-      if (!dpy) {
-        dpy = XOpenDisplay(0);
-        if (!dpy)
-          throw CImgDisplayException("CImgDisplay::screenshot(): Failed to open X11 display.");
-      }
-      Window root = DefaultRootWindow(dpy);
-      XWindowAttributes gwa;
-      XGetWindowAttributes(dpy,root,&gwa);
-      const int width = gwa.width, height = gwa.height;
-      int _x0 = x0, _y0 = y0, _x1 = x1, _y1 = y1;
-      if (_x0>_x1) cimg::swap(_x0,_x1);
-      if (_y0>_y1) cimg::swap(_y0,_y1);
-
-      XImage *image = 0;
-      if (_x1>=0 && _x0<width && _y1>=0 && _y0<height) {
-        _x0 = std::max(_x0,0);
-        _y0 = std::max(_y0,0);
-        _x1 = std::min(_x1,width - 1);
-        _y1 = std::min(_y1,height - 1);
-        image = XGetImage(dpy,root,_x0,_y0,_x1 - _x0 + 1,_y1 - _y0 + 1,AllPlanes,ZPixmap);
-
-        if (image) {
-          const unsigned long
-            red_mask = image->red_mask,
-            green_mask = image->green_mask,
-            blue_mask = image->blue_mask;
-          img.assign(image->width,image->height,1,3);
-          T *pR = img.data(0,0,0,0), *pG = img.data(0,0,0,1), *pB = img.data(0,0,0,2);
-          cimg_forXY(img,x,y) {
-            const unsigned long pixel = XGetPixel(image,x,y);
-            *(pR++) = (T)((pixel & red_mask)>>16);
-            *(pG++) = (T)((pixel & green_mask)>>8);
-            *(pB++) = (T)(pixel & blue_mask);
-          }
-          XDestroyImage(image);
-        }
-      }
-      if (!cimg::X11_attr().display) XCloseDisplay(dpy);
-      cimg_unlock_display();
-      if (img.is_empty())
-        throw CImgDisplayException("CImgDisplay::screenshot(): Failed to take screenshot "
-                                   "with coordinates (%d,%d)-(%d,%d).",
-                                   x0,y0,x1,y1);
-    }
-
-    template<typename T>
-    const CImgDisplay& snapshot(CImg<T>& img) const {
-      if (is_empty()) { img.assign(); return *this; }
-      const unsigned char *ptrs = (unsigned char*)_data;
-      img.assign(_width,_height,1,3);
-      T
-        *data1 = img.data(0,0,0,0),
-        *data2 = img.data(0,0,0,1),
-        *data3 = img.data(0,0,0,2);
-      if (cimg::X11_attr().is_blue_first) cimg::swap(data1,data3);
-      switch (cimg::X11_attr().nb_bits) {
-      case 8 : {
-        for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-          const unsigned char val = *(ptrs++);
-          *(data1++) = (T)(val&0xe0);
-          *(data2++) = (T)((val&0x1c)<<3);
-          *(data3++) = (T)(val<<6);
-        }
-      } break;
-      case 16 : {
-        if (cimg::X11_attr().byte_order) for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-          const unsigned char
-            val0 = ptrs[0],
-            val1 = ptrs[1];
-          ptrs+=2;
-          *(data1++) = (T)(val0&0xf8);
-          *(data2++) = (T)((val0<<5) | ((val1&0xe0)>>5));
-          *(data3++) = (T)(val1<<3);
-          } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-          const unsigned short
-            val0 = ptrs[0],
-            val1 = ptrs[1];
-          ptrs+=2;
-          *(data1++) = (T)(val1&0xf8);
-          *(data2++) = (T)((val1<<5) | ((val0&0xe0)>>5));
-          *(data3++) = (T)(val0<<3);
-        }
-      } break;
-      default : {
-        if (cimg::X11_attr().byte_order) for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-          ++ptrs;
-          *(data1++) = (T)ptrs[0];
-          *(data2++) = (T)ptrs[1];
-          *(data3++) = (T)ptrs[2];
-          ptrs+=3;
-          } else for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            *(data3++) = (T)ptrs[0];
-            *(data2++) = (T)ptrs[1];
-            *(data1++) = (T)ptrs[2];
-            ptrs+=3;
-            ++ptrs;
-          }
-      }
-      }
-      return *this;
-    }
-
-    // Windows-based implementation.
-    //-------------------------------
-#elif cimg_display==2
-
-    bool _is_mouse_tracked, _is_cursor_visible;
-    HANDLE _thread, _is_created, _mutex;
-    HWND _window, _background_window;
-    CLIENTCREATESTRUCT _ccs;
-    unsigned int *_data;
-    DEVMODE _curr_mode;
-    BITMAPINFO _bmi;
-    HDC _hdc;
-
-    static int screen_width() {
-      DEVMODE mode;
-      mode.dmSize = sizeof(DEVMODE);
-      mode.dmDriverExtra = 0;
-      EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&mode);
-      return (int)mode.dmPelsWidth;
-    }
-
-    static int screen_height() {
-      DEVMODE mode;
-      mode.dmSize = sizeof(DEVMODE);
-      mode.dmDriverExtra = 0;
-      EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&mode);
-      return (int)mode.dmPelsHeight;
-    }
-
-    static void wait_all() {
-      WaitForSingleObject(cimg::Win32_attr().wait_event,INFINITE);
-    }
-
-    static LRESULT APIENTRY _handle_events(HWND window, UINT msg, WPARAM wParam, LPARAM lParam) {
-#ifdef _WIN64
-      CImgDisplay *const disp = (CImgDisplay*)GetWindowLongPtr(window,GWLP_USERDATA);
-#else
-      CImgDisplay *const disp = (CImgDisplay*)GetWindowLong(window,GWL_USERDATA);
-#endif
-      MSG st_msg;
-      switch (msg) {
-      case WM_CLOSE :
-        disp->_mouse_x = disp->_mouse_y = -1;
-        disp->_window_x = disp->_window_y = 0;
-        disp->set_button().set_key(0).set_key(0,false)._is_closed = true;
-        ReleaseMutex(disp->_mutex);
-        ShowWindow(disp->_window,SW_HIDE);
-        disp->_is_event = true;
-        SetEvent(cimg::Win32_attr().wait_event);
-        return 0;
-      case WM_SIZE : {
-        while (PeekMessage(&st_msg,window,WM_SIZE,WM_SIZE,PM_REMOVE)) {}
-        WaitForSingleObject(disp->_mutex,INFINITE);
-        const unsigned int nw = LOWORD(lParam),nh = HIWORD(lParam);
-        if (nw && nh && (nw!=disp->_width || nh!=disp->_height)) {
-          disp->_window_width = nw;
-          disp->_window_height = nh;
-          disp->_mouse_x = disp->_mouse_y = -1;
-          disp->_is_resized = disp->_is_event = true;
-          SetEvent(cimg::Win32_attr().wait_event);
-        }
-        ReleaseMutex(disp->_mutex);
-      } break;
-      case WM_MOVE : {
-        while (PeekMessage(&st_msg,window,WM_SIZE,WM_SIZE,PM_REMOVE)) {}
-        WaitForSingleObject(disp->_mutex,INFINITE);
-        const int nx = (int)(short)(LOWORD(lParam)), ny = (int)(short)(HIWORD(lParam));
-        if (nx!=disp->_window_x || ny!=disp->_window_y) {
-          disp->_window_x = nx;
-          disp->_window_y = ny;
-          disp->_is_moved = disp->_is_event = true;
-          SetEvent(cimg::Win32_attr().wait_event);
-        }
-        ReleaseMutex(disp->_mutex);
-      } break;
-      case WM_PAINT :
-        disp->paint();
-        cimg::mutex(15);
-        if (disp->_is_cursor_visible) while (ShowCursor(TRUE)<0); else while (ShowCursor(FALSE)>=0);
-        cimg::mutex(15,0);
-        break;
-      case WM_ERASEBKGND :
-        //        return 0;
-        break;
-      case WM_KEYDOWN :
-        disp->set_key((unsigned int)wParam);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_KEYUP :
-        disp->set_key((unsigned int)wParam,false);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_MOUSEMOVE : {
-        while (PeekMessage(&st_msg,window,WM_MOUSEMOVE,WM_MOUSEMOVE,PM_REMOVE)) {}
-        disp->_mouse_x = LOWORD(lParam);
-        disp->_mouse_y = HIWORD(lParam);
-#if (_WIN32_WINNT>=0x0400) && !defined(NOTRACKMOUSEEVENT)
-        if (!disp->_is_mouse_tracked) {
-          TRACKMOUSEEVENT tme;
-          tme.cbSize = sizeof(TRACKMOUSEEVENT);
-          tme.dwFlags = TME_LEAVE;
-          tme.hwndTrack = disp->_window;
-          if (TrackMouseEvent(&tme)) disp->_is_mouse_tracked = true;
-        }
-#endif
-        if (disp->_mouse_x<0 || disp->_mouse_y<0 || disp->_mouse_x>=disp->width() || disp->_mouse_y>=disp->height())
-          disp->_mouse_x = disp->_mouse_y = -1;
-        disp->_is_event = true;
-        SetEvent(cimg::Win32_attr().wait_event);
-        cimg::mutex(15);
-        if (disp->_is_cursor_visible) while (ShowCursor(TRUE)<0); else while (ShowCursor(FALSE)>=0);
-        cimg::mutex(15,0);
-      } break;
-      case WM_MOUSELEAVE : {
-        disp->_mouse_x = disp->_mouse_y = -1;
-        disp->_is_mouse_tracked = false;
-        cimg::mutex(15);
-        while (ShowCursor(TRUE)<0) {}
-        cimg::mutex(15,0);
-      } break;
-      case WM_LBUTTONDOWN :
-        disp->set_button(1);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_RBUTTONDOWN :
-        disp->set_button(2);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_MBUTTONDOWN :
-        disp->set_button(3);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_LBUTTONUP :
-        disp->set_button(1,false);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_RBUTTONUP :
-        disp->set_button(2,false);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case WM_MBUTTONUP :
-        disp->set_button(3,false);
-        SetEvent(cimg::Win32_attr().wait_event);
-        break;
-      case 0x020A : // WM_MOUSEWHEEL:
-        disp->set_wheel((int)((short)HIWORD(wParam))/120);
-        SetEvent(cimg::Win32_attr().wait_event);
-      }
-      return DefWindowProc(window,msg,wParam,lParam);
-    }
-
-    static DWORD WINAPI _events_thread(void* arg) {
-      CImgDisplay *const disp = (CImgDisplay*)(((void**)arg)[0]);
-      const char *const title = (const char*)(((void**)arg)[1]);
-      MSG msg;
-      delete[] (void**)arg;
-      disp->_bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
-      disp->_bmi.bmiHeader.biWidth = disp->width();
-      disp->_bmi.bmiHeader.biHeight = -disp->height();
-      disp->_bmi.bmiHeader.biPlanes = 1;
-      disp->_bmi.bmiHeader.biBitCount = 32;
-      disp->_bmi.bmiHeader.biCompression = BI_RGB;
-      disp->_bmi.bmiHeader.biSizeImage = 0;
-      disp->_bmi.bmiHeader.biXPelsPerMeter = 1;
-      disp->_bmi.bmiHeader.biYPelsPerMeter = 1;
-      disp->_bmi.bmiHeader.biClrUsed = 0;
-      disp->_bmi.bmiHeader.biClrImportant = 0;
-      disp->_data = new unsigned int[(size_t)disp->_width*disp->_height];
-      if (!disp->_is_fullscreen) { // Normal window
-        RECT rect;
-        rect.left = rect.top = 0; rect.right = (LONG)disp->_width - 1; rect.bottom = (LONG)disp->_height - 1;
-        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
-        const int
-          border1 = (int)((rect.right - rect.left + 1 - disp->_width)/2),
-          border2 = (int)(rect.bottom - rect.top + 1 - disp->_height - border1);
-        disp->_window = CreateWindowA("MDICLIENT",title?title:" ",
-                                     WS_OVERLAPPEDWINDOW | (disp->_is_closed?0:WS_VISIBLE), CW_USEDEFAULT,CW_USEDEFAULT,
-                                     disp->_width + 2*border1, disp->_height + border1 + border2,
-                                     0,0,0,&(disp->_ccs));
-        if (!disp->_is_closed) {
-          GetWindowRect(disp->_window,&rect);
-          disp->_window_x = rect.left + border1;
-          disp->_window_y = rect.top + border2;
-        } else disp->_window_x = disp->_window_y = 0;
-      } else { // Fullscreen window
-        const unsigned int
-          sx = (unsigned int)screen_width(),
-          sy = (unsigned int)screen_height();
-        disp->_window = CreateWindowA("MDICLIENT",title?title:" ",
-                                     WS_POPUP | (disp->_is_closed?0:WS_VISIBLE),
-                                      (sx - disp->_width)/2,
-                                      (sy - disp->_height)/2,
-                                     disp->_width,disp->_height,0,0,0,&(disp->_ccs));
-        disp->_window_x = disp->_window_y = 0;
-      }
-      SetForegroundWindow(disp->_window);
-      disp->_hdc = GetDC(disp->_window);
-      disp->_window_width = disp->_width;
-      disp->_window_height = disp->_height;
-      disp->flush();
-#ifdef _WIN64
-      SetWindowLongPtr(disp->_window,GWLP_USERDATA,(LONG_PTR)disp);
-      SetWindowLongPtr(disp->_window,GWLP_WNDPROC,(LONG_PTR)_handle_events);
-#else
-      SetWindowLong(disp->_window,GWL_USERDATA,(LONG)disp);
-      SetWindowLong(disp->_window,GWL_WNDPROC,(LONG)_handle_events);
-#endif
-      SetEvent(disp->_is_created);
-      while (GetMessage(&msg,0,0,0)) DispatchMessage(&msg);
-      return 0;
-    }
-
-    CImgDisplay& _update_window_pos() {
-      if (_is_closed) _window_x = _window_y = -1;
-      else {
-        RECT rect;
-        rect.left = rect.top = 0; rect.right = (LONG)_width - 1; rect.bottom = (LONG)_height - 1;
-        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
-        const int
-          border1 = (int)((rect.right - rect.left + 1 - _width)/2),
-          border2 = (int)(rect.bottom - rect.top + 1 - _height - border1);
-        GetWindowRect(_window,&rect);
-        _window_x = rect.left + border1;
-        _window_y = rect.top + border2;
-      }
-      return *this;
-    }
-
-    void _init_fullscreen() {
-      _background_window = 0;
-      if (!_is_fullscreen || _is_closed) _curr_mode.dmSize = 0;
-      else {
-        DEVMODE mode;
-        unsigned int imode = 0, ibest = 0, bestbpp = 0, bw = ~0U, bh = ~0U;
-        for (mode.dmSize = sizeof(DEVMODE), mode.dmDriverExtra = 0; EnumDisplaySettings(0,imode,&mode); ++imode) {
-          const unsigned int nw = mode.dmPelsWidth, nh = mode.dmPelsHeight;
-          if (nw>=_width && nh>=_height && mode.dmBitsPerPel>=bestbpp && nw<=bw && nh<=bh) {
-            bestbpp = mode.dmBitsPerPel;
-            ibest = imode;
-            bw = nw; bh = nh;
-          }
-        }
-        if (bestbpp) {
-          _curr_mode.dmSize = sizeof(DEVMODE); _curr_mode.dmDriverExtra = 0;
-          EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&_curr_mode);
-          EnumDisplaySettings(0,ibest,&mode);
-          ChangeDisplaySettings(&mode,0);
-        } else _curr_mode.dmSize = 0;
-
-        const unsigned int
-          sx = (unsigned int)screen_width(),
-          sy = (unsigned int)screen_height();
-        if (sx!=_width || sy!=_height) {
-          CLIENTCREATESTRUCT background_ccs;
-          _background_window = CreateWindowA("MDICLIENT","",WS_POPUP | WS_VISIBLE, 0,0,sx,sy,0,0,0,&background_ccs);
-          SetForegroundWindow(_background_window);
-        }
-      }
-    }
-
-    void _desinit_fullscreen() {
-      if (!_is_fullscreen) return;
-      if (_background_window) DestroyWindow(_background_window);
-      _background_window = 0;
-      if (_curr_mode.dmSize) ChangeDisplaySettings(&_curr_mode,0);
-      _is_fullscreen = false;
-    }
-
-    CImgDisplay& _assign(const unsigned int dimw, const unsigned int dimh, const char *const ptitle=0,
-                         const unsigned int normalization_type=3,
-                         const bool fullscreen_flag=false, const bool closed_flag=false) {
-
-      // Allocate space for window title
-      const char *const nptitle = ptitle?ptitle:"";
-      const unsigned int s = (unsigned int)std::strlen(nptitle) + 1;
-      char *const tmp_title = s?new char[s]:0;
-      if (s) std::memcpy(tmp_title,nptitle,s*sizeof(char));
-
-      // Destroy previous window if existing
-      if (!is_empty()) assign();
-
-      // Set display variables
-      _width = std::min(dimw,(unsigned int)screen_width());
-      _height = std::min(dimh,(unsigned int)screen_height());
-      _normalization = normalization_type<4?normalization_type:3;
-      _is_fullscreen = fullscreen_flag;
-      _window_x = _window_y = 0;
-      _is_closed = closed_flag;
-      _is_cursor_visible = true;
-      _is_mouse_tracked = false;
-      _title = tmp_title;
-      flush();
-      if (_is_fullscreen) _init_fullscreen();
-
-      // Create event thread
-      void *const arg = (void*)(new void*[2]);
-      ((void**)arg)[0] = (void*)this;
-      ((void**)arg)[1] = (void*)_title;
-      _mutex = CreateMutex(0,FALSE,0);
-      _is_created = CreateEvent(0,FALSE,FALSE,0);
-      _thread = CreateThread(0,0,_events_thread,arg,0,0);
-      WaitForSingleObject(_is_created,INFINITE);
-      return *this;
-    }
-
-    CImgDisplay& assign() {
-      if (is_empty()) return flush();
-      DestroyWindow(_window);
-      TerminateThread(_thread,0);
-      delete[] _data;
-      delete[] _title;
-      _data = 0;
-      _title = 0;
-      if (_is_fullscreen) _desinit_fullscreen();
-      _width = _height = _normalization = _window_width = _window_height = 0;
-      _window_x = _window_y = 0;
-      _is_fullscreen = false;
-      _is_closed = true;
-      _min = _max = 0;
-      _title = 0;
-      flush();
-      return *this;
-    }
-
-    CImgDisplay& assign(const unsigned int dimw, const unsigned int dimh, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!dimw || !dimh) return assign();
-      _assign(dimw,dimh,title,normalization_type,fullscreen_flag,closed_flag);
-      _min = _max = 0;
-      std::memset(_data,0,sizeof(unsigned int)*_width*_height);
-      return paint();
-    }
-
-    template<typename T>
-    CImgDisplay& assign(const CImg<T>& img, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!img) return assign();
-      CImg<T> tmp;
-      const CImg<T>& nimg = (img._depth==1)?img:(tmp=img.get_projections2d((img._width - 1)/2,
-                                                                           (img._height - 1)/2,
-                                                                           (img._depth - 1)/2));
-      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
-      if (_normalization==2) _min = (float)nimg.min_max(_max);
-      return display(nimg);
-    }
-
-    template<typename T>
-    CImgDisplay& assign(const CImgList<T>& list, const char *const title=0,
-                        const unsigned int normalization_type=3,
-                        const bool fullscreen_flag=false, const bool closed_flag=false) {
-      if (!list) return assign();
-      CImg<T> tmp;
-      const CImg<T> img = list>'x', &nimg = (img._depth==1)?img:(tmp=img.get_projections2d((img._width - 1)/2,
-                                                                                           (img._height - 1)/2,
-                                                                                           (img._depth - 1)/2));
-      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
-      if (_normalization==2) _min = (float)nimg.min_max(_max);
-      return display(nimg);
-    }
-
-    CImgDisplay& assign(const CImgDisplay& disp) {
-      if (!disp) return assign();
-      _assign(disp._width,disp._height,disp._title,disp._normalization,disp._is_fullscreen,disp._is_closed);
-      std::memcpy(_data,disp._data,sizeof(unsigned int)*_width*_height);
-      return paint();
-    }
-
-    CImgDisplay& resize(const int nwidth, const int nheight, const bool force_redraw=true) {
-      if (!nwidth || !nheight || (is_empty() && (nwidth<0 || nheight<0))) return assign();
-      if (is_empty()) return assign(nwidth,nheight);
-      const unsigned int
-        tmpdimx = (nwidth>0)?nwidth:(-nwidth*_width/100),
-        tmpdimy = (nheight>0)?nheight:(-nheight*_height/100),
-        dimx = tmpdimx?tmpdimx:1,
-        dimy = tmpdimy?tmpdimy:1;
-      if (_width!=dimx || _height!=dimy || _window_width!=dimx || _window_height!=dimy) {
-        if (_window_width!=dimx || _window_height!=dimy) {
-          RECT rect; rect.left = rect.top = 0; rect.right = (LONG)dimx - 1; rect.bottom = (LONG)dimy - 1;
-          AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
-          const int cwidth = rect.right - rect.left + 1, cheight = rect.bottom - rect.top + 1;
-          SetWindowPos(_window,0,0,0,cwidth,cheight,SWP_NOMOVE | SWP_NOZORDER | SWP_NOCOPYBITS);
-        }
-        if (_width!=dimx || _height!=dimy) {
-          unsigned int *const ndata = new unsigned int[dimx*dimy];
-          if (force_redraw) _render_resize(_data,_width,_height,ndata,dimx,dimy);
-          else std::memset(ndata,0x80,sizeof(unsigned int)*dimx*dimy);
-          delete[] _data;
-          _data = ndata;
-          _bmi.bmiHeader.biWidth = (LONG)dimx;
-          _bmi.bmiHeader.biHeight = -(int)dimy;
-          _width = dimx;
-          _height = dimy;
-        }
-        _window_width = dimx; _window_height = dimy;
-        show();
-      }
-      _is_resized = false;
-      if (_is_fullscreen) move((screen_width() - width())/2,(screen_height() - height())/2);
-      if (force_redraw) return paint();
-      return *this;
-    }
-
-    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
-      if (is_empty()) return *this;
-      if (force_redraw) {
-        const cimg_ulong buf_size = (cimg_ulong)_width*_height*4;
-        void *odata = std::malloc(buf_size);
-        if (odata) {
-          std::memcpy(odata,_data,buf_size);
-          assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
-          std::memcpy(_data,odata,buf_size);
-          std::free(odata);
-        }
-        return paint();
-      }
-      return assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
-    }
-
-    CImgDisplay& show() {
-      if (is_empty() || !_is_closed) return *this;
-      _is_closed = false;
-      if (_is_fullscreen) _init_fullscreen();
-      ShowWindow(_window,SW_SHOW);
-      _update_window_pos();
-      return paint();
-    }
-
-    CImgDisplay& close() {
-      if (is_empty() || _is_closed) return *this;
-      _is_closed = true;
-      if (_is_fullscreen) _desinit_fullscreen();
-      ShowWindow(_window,SW_HIDE);
-      _window_x = _window_y = 0;
-      return *this;
-    }
-
-    CImgDisplay& move(const int posx, const int posy) {
-      if (is_empty()) return *this;
-      if (_window_x!=posx || _window_y!=posy) {
-        if (!_is_fullscreen) {
-          RECT rect;
-          rect.left = rect.top = 0; rect.right = (LONG)_window_width - 1; rect.bottom = (LONG)_window_height - 1;
-          AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
-          const int
-            border1 = (int)((rect.right - rect.left + 1 -_width)/2),
-            border2 = (int)(rect.bottom - rect.top + 1 - _height - border1);
-          SetWindowPos(_window,0,posx - border1,posy - border2,0,0,SWP_NOSIZE | SWP_NOZORDER);
-        } else SetWindowPos(_window,0,posx,posy,0,0,SWP_NOSIZE | SWP_NOZORDER);
-        _window_x = posx;
-        _window_y = posy;
-        show();
-      }
-      _is_moved = false;
-      return *this;
-    }
-
-    CImgDisplay& show_mouse() {
-      if (is_empty()) return *this;
-      _is_cursor_visible = true;
-      return *this;
-    }
-
-    CImgDisplay& hide_mouse() {
-      if (is_empty()) return *this;
-      _is_cursor_visible = false;
-      return *this;
-    }
-
-    CImgDisplay& set_mouse(const int posx, const int posy) {
-      if (is_empty() || _is_closed || posx<0 || posy<0) return *this;
-      _update_window_pos();
-      const int res = (int)SetCursorPos(_window_x + posx,_window_y + posy);
-      if (res) { _mouse_x = posx; _mouse_y = posy; }
-      return *this;
-    }
-
-    CImgDisplay& set_title(const char *const format, ...) {
-      if (is_empty()) return *this;
-      char *const tmp = new char[1024];
-      va_list ap;
-      va_start(ap, format);
-      cimg_vsnprintf(tmp,1024,format,ap);
-      va_end(ap);
-      if (!std::strcmp(_title,tmp)) { delete[] tmp; return *this; }
-      delete[] _title;
-      const unsigned int s = (unsigned int)std::strlen(tmp) + 1;
-      _title = new char[s];
-      std::memcpy(_title,tmp,s*sizeof(char));
-      SetWindowTextA(_window, tmp);
-      delete[] tmp;
-      return *this;
-    }
-
-    template<typename T>
-    CImgDisplay& display(const CImg<T>& img) {
-      if (!img)
-        throw CImgArgumentException(_cimgdisplay_instance
-                                    "display(): Empty specified image.",
-                                    cimgdisplay_instance);
-      if (is_empty()) return assign(img);
-      return render(img).paint();
-    }
-
-    CImgDisplay& paint() {
-      if (_is_closed) return *this;
-      WaitForSingleObject(_mutex,INFINITE);
-      SetDIBitsToDevice(_hdc,0,0,_width,_height,0,0,0,_height,_data,&_bmi,DIB_RGB_COLORS);
-      ReleaseMutex(_mutex);
-      return *this;
-    }
-
-    template<typename T>
-    CImgDisplay& render(const CImg<T>& img) {
-      if (!img)
-        throw CImgArgumentException(_cimgdisplay_instance
-                                    "render(): Empty specified image.",
-                                    cimgdisplay_instance);
-
-      if (is_empty()) return *this;
-      if (img._depth!=1) return render(img.get_projections2d((img._width - 1)/2,(img._height - 1)/2,
-                                                             (img._depth - 1)/2));
-
-      const T
-        *data1 = img._data,
-        *data2 = (img._spectrum>=2)?img.data(0,0,0,1):data1,
-        *data3 = (img._spectrum>=3)?img.data(0,0,0,2):data1;
-
-      WaitForSingleObject(_mutex,INFINITE);
-      unsigned int
-        *const ndata = (img._width==_width && img._height==_height)?_data:
-        new unsigned int[(size_t)img._width*img._height],
-        *ptrd = ndata;
-
-      if (!_normalization || (_normalization==3 && cimg::type<T>::string()==cimg::type<unsigned char>::string())) {
-        _min = _max = 0;
-        switch (img._spectrum) {
-        case 1 : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char val = (unsigned char)*(data1++);
-            *(ptrd++) = (unsigned int)((val<<16) | (val<<8) | val);
-          }
-        } break;
-        case 2 : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char
-              R = (unsigned char)*(data1++),
-              G = (unsigned char)*(data2++);
-            *(ptrd++) = (unsigned int)((R<<16) | (G<<8));
-          }
-        } break;
-        default : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char
-              R = (unsigned char)*(data1++),
-              G = (unsigned char)*(data2++),
-              B = (unsigned char)*(data3++);
-            *(ptrd++) = (unsigned int)((R<<16) | (G<<8) | B);
-          }
-        }
-        }
-      } else {
-        if (_normalization==3) {
-          if (cimg::type<T>::is_float()) _min = (float)img.min_max(_max);
-          else { _min = (float)cimg::type<T>::min(); _max = (float)cimg::type<T>::max(); }
-        } else if ((_min>_max) || _normalization==1) _min = (float)img.min_max(_max);
-        const float delta = _max - _min, mm = 255/(delta?delta:1.0f);
-        switch (img._spectrum) {
-        case 1 : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char val = (unsigned char)((*(data1++) - _min)*mm);
-            *(ptrd++) = (unsigned int)((val<<16) | (val<<8) | val);
-          }
-        } break;
-        case 2 : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char
-              R = (unsigned char)((*(data1++) - _min)*mm),
-              G = (unsigned char)((*(data2++) - _min)*mm);
-            *(ptrd++) = (unsigned int)((R<<16) | (G<<8));
-          }
-        } break;
-        default : {
-          for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-            const unsigned char
-              R = (unsigned char)((*(data1++) - _min)*mm),
-              G = (unsigned char)((*(data2++) - _min)*mm),
-              B = (unsigned char)((*(data3++) - _min)*mm);
-            *(ptrd++) = (unsigned int)((R<<16) | (G<<8) | B);
-          }
-        }
-        }
-      }
-      if (ndata!=_data) { _render_resize(ndata,img._width,img._height,_data,_width,_height); delete[] ndata; }
-      ReleaseMutex(_mutex);
-      return *this;
-    }
-
-    template<typename T>
-    static void screenshot(const int x0, const int y0, const int x1, const int y1, CImg<T>& img) {
-      img.assign();
-      HDC hScreen = GetDC(GetDesktopWindow());
-      if (hScreen) {
-        const int
-          width = GetDeviceCaps(hScreen,HORZRES),
-          height = GetDeviceCaps(hScreen,VERTRES);
-        int _x0 = x0, _y0 = y0, _x1 = x1, _y1 = y1;
-        if (_x0>_x1) cimg::swap(_x0,_x1);
-        if (_y0>_y1) cimg::swap(_y0,_y1);
-        if (_x1>=0 && _x0<width && _y1>=0 && _y0<height) {
-          _x0 = std::max(_x0,0);
-          _y0 = std::max(_y0,0);
-          _x1 = std::min(_x1,width - 1);
-          _y1 = std::min(_y1,height - 1);
-          const int bw = _x1 - _x0 + 1, bh = _y1 - _y0 + 1;
-          HDC hdcMem = CreateCompatibleDC(hScreen);
-          if (hdcMem) {
-            HBITMAP hBitmap = CreateCompatibleBitmap(hScreen,bw,bh);
-            if (hBitmap) {
-              HGDIOBJ hOld = SelectObject(hdcMem,hBitmap);
-              if (hOld && BitBlt(hdcMem,0,0,bw,bh,hScreen,_x0,_y0,SRCCOPY) && SelectObject(hdcMem,hOld)) {
-                BITMAPINFOHEADER bmi;
-                bmi.biSize = sizeof(BITMAPINFOHEADER);
-                bmi.biWidth = bw;
-                bmi.biHeight = -bh;
-                bmi.biPlanes = 1;
-                bmi.biBitCount = 32;
-                bmi.biCompression = BI_RGB;
-                bmi.biSizeImage = 0;
-                bmi.biXPelsPerMeter = bmi.biYPelsPerMeter = 0;
-                bmi.biClrUsed = bmi.biClrImportant = 0;
-                unsigned char *buf = new unsigned char[4*bw*bh];
-                if (GetDIBits(hdcMem,hBitmap,0,bh,buf,(BITMAPINFO*)&bmi,DIB_RGB_COLORS)) {
-                  img.assign(bw,bh,1,3);
-                  const unsigned char *ptrs = buf;
-                  T *pR = img.data(0,0,0,0), *pG = img.data(0,0,0,1), *pB = img.data(0,0,0,2);
-                  cimg_forXY(img,x,y) {
-                    *(pR++) = (T)ptrs[2];
-                    *(pG++) = (T)ptrs[1];
-                    *(pB++) = (T)ptrs[0];
-                    ptrs+=4;
-                  }
-                }
-                delete[] buf;
-              }
-              DeleteObject(hBitmap);
-            }
-            DeleteDC(hdcMem);
-          }
-        }
-        ReleaseDC(GetDesktopWindow(),hScreen);
-      }
-      if (img.is_empty())
-        throw CImgDisplayException("CImgDisplay::screenshot(): Failed to take screenshot "
-                                   "with coordinates (%d,%d)-(%d,%d).",
-                                   x0,y0,x1,y1);
-    }
-
-    template<typename T>
-    const CImgDisplay& snapshot(CImg<T>& img) const {
-      if (is_empty()) { img.assign(); return *this; }
-      const unsigned int *ptrs = _data;
-      img.assign(_width,_height,1,3);
-      T
-        *data1 = img.data(0,0,0,0),
-        *data2 = img.data(0,0,0,1),
-        *data3 = img.data(0,0,0,2);
-      for (cimg_ulong xy = (cimg_ulong)img._width*img._height; xy>0; --xy) {
-        const unsigned int val = *(ptrs++);
-        *(data1++) = (T)(unsigned char)(val>>16);
-        *(data2++) = (T)(unsigned char)((val>>8)&0xFF);
-        *(data3++) = (T)(unsigned char)(val&0xFF);
-      }
-      return *this;
-    }
-#endif
-
-    //@}
-  };
-
-  /*
-   #--------------------------------------
-   #
-   #
-   #
-   # Definition of the CImg<T> structure
-   #
-   #
-   #
-   #--------------------------------------
-   */
-
-  //! Class representing an image (up to 4 dimensions wide), each pixel being of type \c T.
-  /**
-     This is the main class of the %CImg Library. It declares and constructs
-     an image, allows access to its pixel values, and is able to perform various image operations.
-
-     \par Image representation
-
-     A %CImg image is defined as an instance of the container \c CImg<T>, which contains a regular grid of pixels,
-     each pixel value being of type \c T. The image grid can have up to 4 dimensions: width, height, depth
-     and number of channels.
-     Usually, the three first dimensions are used to describe spatial coordinates <tt>(x,y,z)</tt>,
-     while the number of channels is rather used as a vector-valued dimension
-     (it may describe the R,G,B color channels for instance).
-     If you need a fifth dimension, you can use image lists \c CImgList<T> rather than simple images \c CImg<T>.
-
-     Thus, the \c CImg<T> class is able to represent volumetric images of vector-valued pixels,
-     as well as images with less dimensions (1d scalar signal, 2d color images, ...).
-     Most member functions of the class CImg<\c T> are designed to handle this maximum case of (3+1) dimensions.
-
-     Concerning the pixel value type \c T:
-     fully supported template types are the basic C++ types: <tt>unsigned char, char, short, unsigned int, int,
-     unsigned long, long, float, double, ... </tt>.
-     Typically, fast image display can be done using <tt>CImg<unsigned char></tt> images,
-     while complex image processing algorithms may be rather coded using <tt>CImg<float></tt> or <tt>CImg<double></tt>
-     images that have floating-point pixel values. The default value for the template T is \c float.
-     Using your own template types may be possible. However, you will certainly have to define the complete set
-     of arithmetic and logical operators for your class.
-
-     \par Image structure
-
-     The \c CImg<T> structure contains \e six fields:
-     - \c _width defines the number of \a columns of the image (size along the X-axis).
-     - \c _height defines the number of \a rows of the image (size along the Y-axis).
-     - \c _depth defines the number of \a slices of the image (size along the Z-axis).
-     - \c _spectrum defines the number of \a channels of the image (size along the C-axis).
-     - \c _data defines a \a pointer to the \a pixel \a data (of type \c T).
-     - \c _is_shared is a boolean that tells if the memory buffer \c data is shared with
-       another image.
-
-     You can access these fields publicly although it is recommended to use the dedicated functions
-     width(), height(), depth(), spectrum() and ptr() to do so.
-     Image dimensions are not limited to a specific range (as long as you got enough available memory).
-     A value of \e 1 usually means that the corresponding dimension is \a flat.
-     If one of the dimensions is \e 0, or if the data pointer is null, the image is considered as \e empty.
-     Empty images should not contain any pixel data and thus, will not be processed by CImg member functions
-     (a CImgInstanceException will be thrown instead).
-     Pixel data are stored in memory, in a non interlaced mode (See \ref cimg_storage).
-
-     \par Image declaration and construction
-
-     Declaring an image can be done by using one of the several available constructors.
-     Here is a list of the most used:
-
-     - Construct images from arbitrary dimensions:
-         - <tt>CImg<char> img;</tt> declares an empty image.
-         - <tt>CImg<unsigned char> img(128,128);</tt> declares a 128x128 greyscale image with
-         \c unsigned \c char pixel values.
-         - <tt>CImg<double> img(3,3);</tt> declares a 3x3 matrix with \c double coefficients.
-         - <tt>CImg<unsigned char> img(256,256,1,3);</tt> declares a 256x256x1x3 (color) image
-         (colors are stored as an image with three channels).
-         - <tt>CImg<double> img(128,128,128);</tt> declares a 128x128x128 volumetric and greyscale image
-         (with \c double pixel values).
-         - <tt>CImg<> img(128,128,128,3);</tt> declares a 128x128x128 volumetric color image
-         (with \c float pixels, which is the default value of the template parameter \c T).
-         - \b Note: images pixels are <b>not automatically initialized to 0</b>. You may use the function \c fill() to
-         do it, or use the specific constructor taking 5 parameters like this:
-         <tt>CImg<> img(128,128,128,3,0);</tt> declares a 128x128x128 volumetric color image with all pixel values to 0.
-
-     - Construct images from filenames:
-         - <tt>CImg<unsigned char> img("image.jpg");</tt> reads a JPEG color image from the file "image.jpg".
-         - <tt>CImg<float> img("analyze.hdr");</tt> reads a volumetric image (ANALYZE7.5 format) from the
-         file "analyze.hdr".
-         - \b Note: You need to install <a href="http://www.imagemagick.org">ImageMagick</a>
-         to be able to read common compressed image formats (JPG,PNG, ...) (See \ref cimg_files_io).
-
-     - Construct images from C-style arrays:
-         - <tt>CImg<int> img(data_buffer,256,256);</tt> constructs a 256x256 greyscale image from a \c int* buffer
-         \c data_buffer (of size 256x256=65536).
-         - <tt>CImg<unsigned char> img(data_buffer,256,256,1,3);</tt> constructs a 256x256 color image
-         from a \c unsigned \c char* buffer \c data_buffer (where R,G,B channels follow each others).
-
-         The complete list of constructors can be found <a href="#constructors">here</a>.
-
-     \par Most useful functions
-
-     The \c CImg<T> class contains a lot of functions that operates on images.
-     Some of the most useful are:
-
-     - operator()(): Read or write pixel values.
-     - display(): displays the image in a new window.
-  **/
-  template<typename T>
-  struct CImg {
-
-    unsigned int _width, _height, _depth, _spectrum;
-    bool _is_shared;
-    T *_data;
-
-    //! Simple iterator type, to loop through each pixel value of an image instance.
-    /**
-       \note
-       - The \c CImg<T>::iterator type is defined to be a <tt>T*</tt>.
-       - You will seldom have to use iterators in %CImg, most classical operations
-         being achieved (often in a faster way) using methods of \c CImg<T>.
-       \par Example
-       \code
-       CImg<float> img("reference.jpg");                                         // Load image from file.
-       // Set all pixels to '0', with a CImg iterator.
-       for (CImg<float>::iterator it = img.begin(), it<img.end(); ++it) *it = 0;
-       img.fill(0);                                                              // Do the same with a built-in method.
-       \endcode
-   **/
-    typedef T* iterator;
-
-    //! Simple const iterator type, to loop through each pixel value of a \c const image instance.
-    /**
-       \note
-       - The \c CImg<T>::const_iterator type is defined to be a \c const \c T*.
-       - You will seldom have to use iterators in %CImg, most classical operations
-         being achieved (often in a faster way) using methods of \c CImg<T>.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");                                    // Load image from file.
-       float sum = 0;
-       // Compute sum of all pixel values, with a CImg iterator.
-       for (CImg<float>::iterator it = img.begin(), it<img.end(); ++it) sum+=*it;
-       const float sum2 = img.sum();                                              // Do the same with a built-in method.
-       \endcode
-    **/
-    typedef const T* const_iterator;
-
-    //! Pixel value type.
-    /**
-       Refer to the type of the pixel values of an image instance.
-       \note
-       - The \c CImg<T>::value_type type of a \c CImg<T> is defined to be a \c T.
-       - \c CImg<T>::value_type is actually not used in %CImg methods. It has been mainly defined for
-         compatibility with STL naming conventions.
-    **/
-    typedef T value_type;
-
-    // Define common types related to template type T.
-    typedef typename cimg::superset<T,bool>::type Tbool;
-    typedef typename cimg::superset<T,unsigned char>::type Tuchar;
-    typedef typename cimg::superset<T,char>::type Tchar;
-    typedef typename cimg::superset<T,unsigned short>::type Tushort;
-    typedef typename cimg::superset<T,short>::type Tshort;
-    typedef typename cimg::superset<T,unsigned int>::type Tuint;
-    typedef typename cimg::superset<T,int>::type Tint;
-    typedef typename cimg::superset<T,cimg_ulong>::type Tulong;
-    typedef typename cimg::superset<T,cimg_long>::type Tlong;
-    typedef typename cimg::superset<T,float>::type Tfloat;
-    typedef typename cimg::superset<T,double>::type Tdouble;
-    typedef typename cimg::last<T,bool>::type boolT;
-    typedef typename cimg::last<T,unsigned char>::type ucharT;
-    typedef typename cimg::last<T,char>::type charT;
-    typedef typename cimg::last<T,unsigned short>::type ushortT;
-    typedef typename cimg::last<T,short>::type shortT;
-    typedef typename cimg::last<T,unsigned int>::type uintT;
-    typedef typename cimg::last<T,int>::type intT;
-    typedef typename cimg::last<T,cimg_ulong>::type ulongT;
-    typedef typename cimg::last<T,cimg_long>::type longT;
-    typedef typename cimg::last<T,cimg_uint64>::type uint64T;
-    typedef typename cimg::last<T,cimg_int64>::type int64T;
-    typedef typename cimg::last<T,float>::type floatT;
-    typedef typename cimg::last<T,double>::type doubleT;
-
-    //@}
-    //---------------------------
-    //
-    //! \name Plugins
-    //@{
-    //---------------------------
-#ifdef cimg_plugin
-#include cimg_plugin
-#endif
-#ifdef cimg_plugin1
-#include cimg_plugin1
-#endif
-#ifdef cimg_plugin2
-#include cimg_plugin2
-#endif
-#ifdef cimg_plugin3
-#include cimg_plugin3
-#endif
-#ifdef cimg_plugin4
-#include cimg_plugin4
-#endif
-#ifdef cimg_plugin5
-#include cimg_plugin5
-#endif
-#ifdef cimg_plugin6
-#include cimg_plugin6
-#endif
-#ifdef cimg_plugin7
-#include cimg_plugin7
-#endif
-#ifdef cimg_plugin8
-#include cimg_plugin8
-#endif
-
-    //@}
-    //---------------------------------------------------------
-    //
-    //! \name Constructors / Destructor / Instance Management
-    //@{
-    //---------------------------------------------------------
-
-    //! Destroy image.
-    /**
-       \note
-       - The pixel buffer data() is deallocated if necessary, e.g. for non-empty and non-shared image instances.
-       - Destroying an empty or shared image does nothing actually.
-       \warning
-       - When destroying a non-shared image, make sure that you will \e not operate on a remaining shared image
-         that shares its buffer with the destroyed instance, in order to avoid further invalid memory access
-         (to a deallocated buffer).
-    **/
-    ~CImg() {
-      if (!_is_shared) delete[] _data;
-    }
-
-    //! Construct empty image.
-    /**
-       \note
-       - An empty image has no pixel data and all of its dimensions width(), height(), depth(), spectrum()
-         are set to \c 0, as well as its pixel buffer pointer data().
-       - An empty image may be re-assigned afterwards, e.g. with the family of
-         assign(unsigned int,unsigned int,unsigned int,unsigned int) methods,
-         or by operator=(const CImg<t>&). In all cases, the type of pixels stays \c T.
-       - An empty image is never shared.
-       \par Example
-       \code
-       CImg<float> img1, img2;      // Construct two empty images.
-       img1.assign(256,256,1,3);    // Re-assign 'img1' to be a 256x256x1x3 (color) image.
-       img2 = img1.get_rand(0,255); // Re-assign 'img2' to be a random-valued version of 'img1'.
-       img2.assign();               // Re-assign 'img2' to be an empty image again.
-       \endcode
-    **/
-    CImg():_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {}
-
-    //! Construct image with specified size.
-    /**
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \note
-       - It is able to create only \e non-shared images, and allocates thus a pixel buffer data()
-         for each constructed image instance.
-       - Setting one dimension \c size_x,\c size_y,\c size_z or \c size_c to \c 0 leads to the construction of
-         an \e empty image.
-       - A \c CImgInstanceException is thrown when the pixel buffer cannot be allocated
-         (e.g. when requested size is too big for available memory).
-       \warning
-       - The allocated pixel buffer is \e not filled with a default value, and is likely to contain garbage values.
-         In order to initialize pixel values during construction (e.g. with \c 0), use constructor
-         CImg(unsigned int,unsigned int,unsigned int,unsigned int,T) instead.
-       \par Example
-       \code
-       CImg<float> img1(256,256,1,3);   // Construct a 256x256x1x3 (color) image, filled with garbage values.
-       CImg<float> img2(256,256,1,3,0); // Construct a 256x256x1x3 (color) image, filled with value '0'.
-       \endcode
-    **/
-    explicit CImg(const unsigned int size_x, const unsigned int size_y=1,
-                  const unsigned int size_z=1, const unsigned int size_c=1):
-      _is_shared(false) {
-      size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (siz) {
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                      size_x,size_y,size_z,size_c);
-        }
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Construct image with specified size and initialize pixel values.
-    /**
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param value Initialization value.
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int),
-         but it also fills the pixel buffer with the specified \c value.
-       \warning
-       - It cannot be used to construct a vector-valued image and initialize it with \e vector-valued pixels
-         (e.g. RGB vector, for color images).
-         For this task, you may use fillC() after construction.
-    **/
-    CImg(const unsigned int size_x, const unsigned int size_y,
-         const unsigned int size_z, const unsigned int size_c, const T& value):
-      _is_shared(false) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (siz) {
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                      size_x,size_y,size_z,size_c);
-        }
-        fill(value);
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Construct image with specified size and initialize pixel values from a sequence of integers.
-    /**
-       Construct a new image instance of size \c size_x x \c size_y x \c size_z x \c size_c,
-       with pixels of type \c T, and initialize pixel
-       values from the specified sequence of integers \c value0,\c value1,\c ...
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param value0 First value of the initialization sequence (must be an \e integer).
-       \param value1 Second value of the initialization sequence (must be an \e integer).
-       \param ...
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int), but it also fills
-         the pixel buffer with a sequence of specified integer values.
-       \warning
-       - You must specify \e exactly \c size_x*\c size_y*\c size_z*\c size_c integers in the initialization sequence.
-         Otherwise, the constructor may crash or fill your image pixels with garbage.
-       \par Example
-       \code
-       const CImg<float> img(2,2,1,3,      // Construct a 2x2 color (RGB) image.
-                             0,255,0,255,  // Set the 4 values for the red component.
-                             0,0,255,255,  // Set the 4 values for the green component.
-                             64,64,64,64); // Set the 4 values for the blue component.
-       img.resize(150,150).display();
-       \endcode
-       \image html ref_constructor1.jpg
-     **/
-    CImg(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z, const unsigned int size_c,
-         const int value0, const int value1, ...):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-#define _CImg_stdarg(img,a0,a1,N,t) { \
-        size_t _siz = (size_t)N; \
-        if (_siz--) { \
-          va_list ap; \
-          va_start(ap,a1); \
-          T *ptrd = (img)._data; \
-          *(ptrd++) = (T)a0; \
-          if (_siz--) { \
-            *(ptrd++) = (T)a1; \
-            for ( ; _siz; --_siz) *(ptrd++) = (T)va_arg(ap,t); \
-          } \
-          va_end(ap); \
-        } \
-      }
-      assign(size_x,size_y,size_z,size_c);
-      _CImg_stdarg(*this,value0,value1,(size_t)size_x*size_y*size_z*size_c,int);
-    }
-
-#if cimg_use_cpp11==1
-    //! Construct image with specified size and initialize pixel values from an initializer list of integers.
-    /**
-       Construct a new image instance of size \c size_x x \c size_y x \c size_z x \c size_c,
-       with pixels of type \c T, and initialize pixel
-       values from the specified initializer list of integers { \c value0,\c value1,\c ... }
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param { value0, value1, ... } Initialization list
-       \param repeat_values Tells if the value filling process is repeated over the image.
-
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int), but it also fills
-         the pixel buffer with a sequence of specified integer values.
-       \par Example
-       \code
-       const CImg<float> img(2,2,1,3,      // Construct a 2x2 color (RGB) image.
-                             { 0,255,0,255,    // Set the 4 values for the red component.
-                               0,0,255,255,    // Set the 4 values for the green component.
-                               64,64,64,64 }); // Set the 4 values for the blue component.
-       img.resize(150,150).display();
-       \endcode
-       \image html ref_constructor1.jpg
-    **/
-    template<typename t>
-    CImg(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z, const unsigned int size_c,
-         const std::initializer_list<t> values,
-         const bool repeat_values=true):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-#define _cimg_constructor_cpp11(repeat_values) \
-  auto it = values.begin(); \
-  size_t siz = size(); \
-  if (repeat_values) for (T *ptrd = _data; siz--; ) { \
-    *(ptrd++) = (T)(*(it++)); if (it==values.end()) it = values.begin(); } \
-  else { siz = std::min(siz,values.size()); for (T *ptrd = _data; siz--; ) *(ptrd++) = (T)(*(it++)); }
-      assign(size_x,size_y,size_z,size_c);
-      _cimg_constructor_cpp11(repeat_values);
-    }
-
-    template<typename t>
-    CImg(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z,
-         std::initializer_list<t> values,
-         const bool repeat_values=true):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(size_x,size_y,size_z);
-      _cimg_constructor_cpp11(repeat_values);
-    }
-
-    template<typename t>
-    CImg(const unsigned int size_x, const unsigned int size_y,
-         std::initializer_list<t> values,
-         const bool repeat_values=true):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(size_x,size_y);
-      _cimg_constructor_cpp11(repeat_values);
-    }
-
-    template<typename t>
-    CImg(const unsigned int size_x,
-         std::initializer_list<t> values,
-         const bool repeat_values=true):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(size_x);
-      _cimg_constructor_cpp11(repeat_values);
-    }
-
-    //! Construct single channel 1D image with pixel values and width obtained from an initializer list of integers.
-    /**
-       Construct a new image instance of size \c width x \c 1 x \c 1 x \c 1,
-       with pixels of type \c T, and initialize pixel
-       values from the specified initializer list of integers { \c value0,\c value1,\c ... }. Image width is
-       given by the size of the initializer list.
-       \param { value0, value1, ... } Initialization list
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int) with height=1, depth=1, and spectrum=1,
-         but it also fills the pixel buffer with a sequence of specified integer values.
-       \par Example
-       \code
-       const CImg<float> img = {10,20,30,20,10 }; // Construct a 5x1 image with one channel, and set its pixel values.
-       img.resize(150,150).display();
-       \endcode
-       \image html ref_constructor1.jpg
-     **/
-    template<typename t>
-    CImg(const std::initializer_list<t> values):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(values.size(),1,1,1);
-      auto it = values.begin();
-      unsigned int siz = _width;
-      for (T *ptrd = _data; siz--; ) *(ptrd++) = (T)(*(it++));
-    }
-
-    template<typename t>
-    CImg<T> & operator=(std::initializer_list<t> values) {
-      _cimg_constructor_cpp11(siz>values.size());
-      return *this;
-    }
-#endif
-
-    //! Construct image with specified size and initialize pixel values from a sequence of doubles.
-    /**
-       Construct a new image instance of size \c size_x x \c size_y x \c size_z x \c size_c, with pixels of type \c T,
-       and initialize pixel values from the specified sequence of doubles \c value0,\c value1,\c ...
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param value0 First value of the initialization sequence (must be a \e double).
-       \param value1 Second value of the initialization sequence (must be a \e double).
-       \param ...
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int,int,int,...), but
-         takes a sequence of double values instead of integers.
-       \warning
-       - You must specify \e exactly \c dx*\c dy*\c dz*\c dc doubles in the initialization sequence.
-         Otherwise, the constructor may crash or fill your image with garbage.
-         For instance, the code below will probably crash on most platforms:
-         \code
-         const CImg<float> img(2,2,1,1, 0.5,0.5,255,255); // FAIL: The two last arguments are 'int', not 'double'!
-         \endcode
-     **/
-    CImg(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z, const unsigned int size_c,
-         const double value0, const double value1, ...):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(size_x,size_y,size_z,size_c);
-      _CImg_stdarg(*this,value0,value1,(size_t)size_x*size_y*size_z*size_c,double);
-    }
-
-    //! Construct image with specified size and initialize pixel values from a value string.
-    /**
-       Construct a new image instance of size \c size_x x \c size_y x \c size_z x \c size_c, with pixels of type \c T,
-       and initializes pixel values from the specified string \c values.
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param values Value string describing the way pixel values are set.
-       \param repeat_values Tells if the value filling process is repeated over the image.
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int), but it also fills
-         the pixel buffer with values described in the value string \c values.
-       - Value string \c values may describe two different filling processes:
-         - Either \c values is a sequences of values assigned to the image pixels, as in <tt>"1,2,3,7,8,2"</tt>.
-           In this case, set \c repeat_values to \c true to periodically fill the image with the value sequence.
-         - Either, \c values is a formula, as in <tt>"cos(x/10)*sin(y/20)"</tt>.
-           In this case, parameter \c repeat_values is pointless.
-       - For both cases, specifying \c repeat_values is mandatory.
-         It disambiguates the possible overloading of constructor
-         CImg(unsigned int,unsigned int,unsigned int,unsigned int,T) with \c T being a <tt>const char*</tt>.
-       - A \c CImgArgumentException is thrown when an invalid value string \c values is specified.
-       \par Example
-       \code
-       const CImg<float> img1(129,129,1,3,"0,64,128,192,255",true), // Construct image from a value sequence.
-                         img2(129,129,1,3,"if(c==0,255*abs(cos(x/10)),1.8*y)",false); // Construct image from a formula.
-       (img1,img2).display();
-       \endcode
-       \image html ref_constructor2.jpg
-     **/
-    CImg(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z, const unsigned int size_c,
-         const char *const values, const bool repeat_values):_is_shared(false) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (siz) {
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                      size_x,size_y,size_z,size_c);
-        }
-        fill(values,repeat_values);
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer.
-    /**
-       Construct a new image instance of size \c size_x x \c size_y x \c size_z x \c size_c, with pixels of type \c T,
-       and initializes pixel values from the specified \c t* memory buffer.
-       \param values Pointer to the input memory buffer.
-       \param size_x Image width().
-       \param size_y Image height().
-       \param size_z Image depth().
-       \param size_c Image spectrum() (number of channels).
-       \param is_shared Tells if input memory buffer must be shared by the current instance.
-       \note
-       - If \c is_shared is \c false, the image instance allocates its own pixel buffer,
-         and values from the specified input buffer are copied to the instance buffer.
-         If buffer types \c T and \c t are different, a regular static cast is performed during buffer copy.
-       - Otherwise, the image instance does \e not allocate a new buffer, and uses the input memory buffer as its
-         own pixel buffer. This case requires that types \c T and \c t are the same. Later, destroying such a shared
-         image will not deallocate the pixel buffer, this task being obviously charged to the initial buffer allocator.
-       - A \c CImgInstanceException is thrown when the pixel buffer cannot be allocated
-         (e.g. when requested size is too big for available memory).
-       \warning
-       - You must take care when operating on a shared image, since it may have an invalid pixel buffer pointer data()
-         (e.g. already deallocated).
-       \par Example
-       \code
-       unsigned char tab[256*256] = { 0 };
-       CImg<unsigned char> img1(tab,256,256,1,1,false), // Construct new non-shared image from buffer 'tab'.
-                           img2(tab,256,256,1,1,true);  // Construct new shared-image from buffer 'tab'.
-       tab[1024] = 255;                                 // Here, 'img2' is indirectly modified, but not 'img1'.
-       \endcode
-    **/
-    template<typename t>
-    CImg(const t *const values, const unsigned int size_x, const unsigned int size_y=1,
-         const unsigned int size_z=1, const unsigned int size_c=1, const bool is_shared=false):_is_shared(false) {
-      if (is_shared) {
-        _width = _height = _depth = _spectrum = 0; _data = 0;
-        throw CImgArgumentException(_cimg_instance
-                                    "CImg(): Invalid construction request of a (%u,%u,%u,%u) shared instance "
-                                    "from a (%s*) buffer (pixel types are different).",
-                                    cimg_instance,
-                                    size_x,size_y,size_z,size_c,CImg<t>::pixel_type());
-      }
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (values && siz) {
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                      size_x,size_y,size_z,size_c);
-
-        }
-        const t *ptrs = values; cimg_for(*this,ptrd,T) *ptrd = (T)*(ptrs++);
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer \specialization.
-    CImg(const T *const values, const unsigned int size_x, const unsigned int size_y=1,
-         const unsigned int size_z=1, const unsigned int size_c=1, const bool is_shared=false) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (values && siz) {
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c; _is_shared = is_shared;
-        if (_is_shared) _data = const_cast<T*>(values);
-        else {
-          try { _data = new T[siz]; } catch (...) {
-            _width = _height = _depth = _spectrum = 0; _data = 0;
-            throw CImgInstanceException(_cimg_instance
-                                        "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                        cimg_instance,
-                                        cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                        size_x,size_y,size_z,size_c);
-          }
-          std::memcpy(_data,values,siz*sizeof(T));
-        }
-      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
-    }
-
-    //! Construct image from reading an image file.
-    /**
-       Construct a new image instance with pixels of type \c T, and initialize pixel values with the data read from
-       an image file.
-       \param filename Filename, as a C-string.
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int), but it reads the image
-         dimensions and pixel values from the specified image file.
-       - The recognition of the image file format by %CImg higly depends on the tools installed on your system
-         and on the external libraries you used to link your code against.
-       - Considered pixel type \c T should better fit the file format specification, or data loss may occur during
-         file load (e.g. constructing a \c CImg<unsigned char> from a float-valued image file).
-       - A \c CImgIOException is thrown when the specified \c filename cannot be read, or if the file format is not
-         recognized.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");
-       img.display();
-       \endcode
-       \image html ref_image.jpg
-    **/
-    explicit CImg(const char *const filename):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(filename);
-    }
-
-    //! Construct image copy.
-    /**
-       Construct a new image instance with pixels of type \c T, as a copy of an existing \c CImg<t> instance.
-       \param img Input image to copy.
-       \note
-       - Constructed copy has the same size width() x height() x depth() x spectrum() and pixel values as the
-         input image \c img.
-       - If input image \c img is \e shared and if types \c T and \c t are the same, the constructed copy is also
-         \e shared, and shares its pixel buffer with \c img.
-         Modifying a pixel value in the constructed copy will thus also modifies it in the input image \c img.
-         This behavior is needful to allow functions to return shared images.
-       - Otherwise, the constructed copy allocates its own pixel buffer, and copies pixel values from the input
-         image \c img into its buffer. The copied pixel values may be eventually statically casted if types \c T and
-         \c t are different.
-       - Constructing a copy from an image \c img when types \c t and \c T are the same is significantly faster than
-         with different types.
-       - A \c CImgInstanceException is thrown when the pixel buffer cannot be allocated
-         (e.g. not enough available memory).
-    **/
-    template<typename t>
-    CImg(const CImg<t>& img):_is_shared(false) {
-      const size_t siz = (size_t)img.size();
-      if (img._data && siz) {
-        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*img._width*img._height*img._depth*img._spectrum),
-                                      img._width,img._height,img._depth,img._spectrum);
-        }
-        const t *ptrs = img._data; cimg_for(*this,ptrd,T) *ptrd = (T)*(ptrs++);
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Construct image copy \specialization.
-    CImg(const CImg<T>& img) {
-      const size_t siz = (size_t)img.size();
-      if (img._data && siz) {
-        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
-        _is_shared = img._is_shared;
-        if (_is_shared) _data = const_cast<T*>(img._data);
-        else {
-          try { _data = new T[siz]; } catch (...) {
-            _width = _height = _depth = _spectrum = 0; _data = 0;
-            throw CImgInstanceException(_cimg_instance
-                                        "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                        cimg_instance,
-                                        cimg::strbuffersize(sizeof(T)*img._width*img._height*img._depth*img._spectrum),
-                                        img._width,img._height,img._depth,img._spectrum);
-
-          }
-          std::memcpy(_data,img._data,siz*sizeof(T));
-        }
-      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
-    }
-
-    //! Advanced copy constructor.
-    /**
-       Construct a new image instance with pixels of type \c T, as a copy of an existing \c CImg<t> instance,
-       while forcing the shared state of the constructed copy.
-       \param img Input image to copy.
-       \param is_shared Tells about the shared state of the constructed copy.
-       \note
-       - Similar to CImg(const CImg<t>&), except that it allows to decide the shared state of
-         the constructed image, which does not depend anymore on the shared state of the input image \c img:
-         - If \c is_shared is \c true, the constructed copy will share its pixel buffer with the input image \c img.
-           For that case, the pixel types \c T and \c t \e must be the same.
-         - If \c is_shared is \c false, the constructed copy will allocate its own pixel buffer, whether the input
-           image \c img is shared or not.
-       - A \c CImgArgumentException is thrown when a shared copy is requested with different pixel types \c T and \c t.
-    **/
-    template<typename t>
-    CImg(const CImg<t>& img, const bool is_shared):_is_shared(false) {
-      if (is_shared) {
-        _width = _height = _depth = _spectrum = 0; _data = 0;
-        throw CImgArgumentException(_cimg_instance
-                                    "CImg(): Invalid construction request of a shared instance from a "
-                                    "CImg<%s> image (%u,%u,%u,%u,%p) (pixel types are different).",
-                                    cimg_instance,
-                                    CImg<t>::pixel_type(),img._width,img._height,img._depth,img._spectrum,img._data);
-      }
-      const size_t siz = (size_t)img.size();
-      if (img._data && siz) {
-        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
-        try { _data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*img._width*img._height*img._depth*img._spectrum),
-                                      img._width,img._height,img._depth,img._spectrum);
-        }
-        const t *ptrs = img._data; cimg_for(*this,ptrd,T) *ptrd = (T)*(ptrs++);
-      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
-    }
-
-    //! Advanced copy constructor \specialization.
-    CImg(const CImg<T>& img, const bool is_shared) {
-      const size_t siz = (size_t)img.size();
-      if (img._data && siz) {
-        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
-        _is_shared = is_shared;
-        if (_is_shared) _data = const_cast<T*>(img._data);
-        else {
-          try { _data = new T[siz]; } catch (...) {
-            _width = _height = _depth = _spectrum = 0; _data = 0;
-            throw CImgInstanceException(_cimg_instance
-                                        "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                        cimg_instance,
-                                        cimg::strbuffersize(sizeof(T)*img._width*img._height*img._depth*img._spectrum),
-                                        img._width,img._height,img._depth,img._spectrum);
-          }
-          std::memcpy(_data,img._data,siz*sizeof(T));
-        }
-      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
-    }
-
-    //! Construct image with dimensions borrowed from another image.
-    /**
-       Construct a new image instance with pixels of type \c T, and size get from some dimensions of an existing
-       \c CImg<t> instance.
-       \param img Input image from which dimensions are borrowed.
-       \param dimensions C-string describing the image size along the X,Y,Z and C-dimensions.
-       \note
-       - Similar to CImg(unsigned int,unsigned int,unsigned int,unsigned int), but it takes the image dimensions
-         (\e not its pixel values) from an existing \c CImg<t> instance.
-       - The allocated pixel buffer is \e not filled with a default value, and is likely to contain garbage values.
-         In order to initialize pixel values (e.g. with \c 0), use constructor CImg(const CImg<t>&,const char*,T)
-         instead.
-       \par Example
-       \code
-       const CImg<float> img1(256,128,1,3),      // 'img1' is a 256x128x1x3 image.
-                         img2(img1,"xyzc"),      // 'img2' is a 256x128x1x3 image.
-                         img3(img1,"y,x,z,c"),   // 'img3' is a 128x256x1x3 image.
-                         img4(img1,"c,x,y,3",0), // 'img4' is a 3x128x256x3 image (with pixels initialized to '0').
-       \endcode
-     **/
-    template<typename t>
-    CImg(const CImg<t>& img, const char *const dimensions):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(img,dimensions);
-    }
-
-    //! Construct image with dimensions borrowed from another image and initialize pixel values.
-    /**
-       Construct a new image instance with pixels of type \c T, and size get from the dimensions of an existing
-       \c CImg<t> instance, and set all pixel values to specified \c value.
-       \param img Input image from which dimensions are borrowed.
-       \param dimensions String describing the image size along the X,Y,Z and V-dimensions.
-       \param value Value used for initialization.
-       \note
-       - Similar to CImg(const CImg<t>&,const char*), but it also fills the pixel buffer with the specified \c value.
-     **/
-    template<typename t>
-    CImg(const CImg<t>& img, const char *const dimensions, const T& value):
-      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      assign(img,dimensions).fill(value);
-    }
-
-    //! Construct image from a display window.
-    /**
-       Construct a new image instance with pixels of type \c T, as a snapshot of an existing \c CImgDisplay instance.
-       \param disp Input display window.
-       \note
-       - The width() and height() of the constructed image instance are the same as the specified \c CImgDisplay.
-       - The depth() and spectrum() of the constructed image instance are respectively set to \c 1 and \c 3
-         (i.e. a 2d color image).
-       - The image pixels are read as 8-bits RGB values.
-     **/
-    explicit CImg(const CImgDisplay &disp):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      disp.snapshot(*this);
-    }
-
-    // Constructor and assignment operator for rvalue references (c++11).
-    // This avoids an additional image copy for methods returning new images. Can save RAM for big images !
-#if cimg_use_cpp11==1
-    CImg(CImg<T>&& img):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
-      swap(img);
-    }
-    CImg<T>& operator=(CImg<T>&& img) {
-      if (_is_shared) return assign(img);
-      return img.swap(*this);
-    }
-#endif
-
-    //! Construct empty image \inplace.
-    /**
-       In-place version of the default constructor CImg(). It simply resets the instance to an empty image.
-    **/
-    CImg<T>& assign() {
-      if (!_is_shared) delete[] _data;
-      _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0;
-      return *this;
-    }
-
-    //! Construct image with specified size \inplace.
-    /**
-       In-place version of the constructor CImg(unsigned int,unsigned int,unsigned int,unsigned int).
-    **/
-    CImg<T>& assign(const unsigned int size_x, const unsigned int size_y=1,
-                    const unsigned int size_z=1, const unsigned int size_c=1) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (!siz) return assign();
-      const size_t curr_siz = (size_t)size();
-      if (siz!=curr_siz) {
-        if (_is_shared)
-          throw CImgArgumentException(_cimg_instance
-                                      "assign(): Invalid assignement request of shared instance from specified "
-                                      "image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      size_x,size_y,size_z,size_c);
-        else {
-          delete[] _data;
-          try { _data = new T[siz]; } catch (...) {
-            _width = _height = _depth = _spectrum = 0; _data = 0;
-            throw CImgInstanceException(_cimg_instance
-                                        "assign(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                        cimg_instance,
-                                        cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                        size_x,size_y,size_z,size_c);
-          }
-        }
-      }
-      _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-      return *this;
-    }
-
-    //! Construct image with specified size and initialize pixel values \inplace.
-    /**
-       In-place version of the constructor CImg(unsigned int,unsigned int,unsigned int,unsigned int,T).
-    **/
-    CImg<T>& assign(const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c, const T& value) {
-      return assign(size_x,size_y,size_z,size_c).fill(value);
-    }
-
-    //! Construct image with specified size and initialize pixel values from a sequence of integers \inplace.
-    /**
-       In-place version of the constructor CImg(unsigned int,unsigned int,unsigned int,unsigned int,int,int,...).
-    **/
-    CImg<T>& assign(const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c,
-                    const int value0, const int value1, ...) {
-      assign(size_x,size_y,size_z,size_c);
-      _CImg_stdarg(*this,value0,value1,(size_t)size_x*size_y*size_z*size_c,int);
-      return *this;
-    }
-
-    //! Construct image with specified size and initialize pixel values from a sequence of doubles \inplace.
-    /**
-       In-place version of the constructor CImg(unsigned int,unsigned int,unsigned int,unsigned int,double,double,...).
-    **/
-    CImg<T>& assign(const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c,
-                    const double value0, const double value1, ...) {
-      assign(size_x,size_y,size_z,size_c);
-      _CImg_stdarg(*this,value0,value1,(size_t)size_x*size_y*size_z*size_c,double);
-      return *this;
-    }
-
-    //! Construct image with specified size and initialize pixel values from a value string \inplace.
-    /**
-       In-place version of the constructor CImg(unsigned int,unsigned int,unsigned int,unsigned int,const char*,bool).
-    **/
-    CImg<T>& assign(const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c,
-                    const char *const values, const bool repeat_values) {
-      return assign(size_x,size_y,size_z,size_c).fill(values,repeat_values);
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer \inplace.
-    /**
-       In-place version of the constructor CImg(const t*,unsigned int,unsigned int,unsigned int,unsigned int).
-    **/
-    template<typename t>
-    CImg<T>& assign(const t *const values, const unsigned int size_x, const unsigned int size_y=1,
-                    const unsigned int size_z=1, const unsigned int size_c=1) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (!values || !siz) return assign();
-      assign(size_x,size_y,size_z,size_c);
-      const t *ptrs = values; cimg_for(*this,ptrd,T) *ptrd = (T)*(ptrs++);
-      return *this;
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer \specialization.
-    CImg<T>& assign(const T *const values, const unsigned int size_x, const unsigned int size_y=1,
-                    const unsigned int size_z=1, const unsigned int size_c=1) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (!values || !siz) return assign();
-      const size_t curr_siz = (size_t)size();
-      if (values==_data && siz==curr_siz) return assign(size_x,size_y,size_z,size_c);
-      if (_is_shared || values + siz<_data || values>=_data + size()) {
-        assign(size_x,size_y,size_z,size_c);
-        if (_is_shared) std::memmove(_data,values,siz*sizeof(T));
-        else std::memcpy(_data,values,siz*sizeof(T));
-      } else {
-        T *new_data = 0;
-        try { new_data = new T[siz]; } catch (...) {
-          _width = _height = _depth = _spectrum = 0; _data = 0;
-          throw CImgInstanceException(_cimg_instance
-                                      "assign(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
-                                      cimg_instance,
-                                      cimg::strbuffersize(sizeof(T)*size_x*size_y*size_z*size_c),
-                                      size_x,size_y,size_z,size_c);
-        }
-        std::memcpy(new_data,values,siz*sizeof(T));
-        delete[] _data; _data = new_data; _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c;
-      }
-      return *this;
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer \overloading.
-    template<typename t>
-    CImg<T>& assign(const t *const values, const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c, const bool is_shared) {
-      if (is_shared)
-        throw CImgArgumentException(_cimg_instance
-                                    "assign(): Invalid assignment request of shared instance from (%s*) buffer"
-                                    "(pixel types are different).",
-                                    cimg_instance,
-                                    CImg<t>::pixel_type());
-      return assign(values,size_x,size_y,size_z,size_c);
-    }
-
-    //! Construct image with specified size and initialize pixel values from a memory buffer \overloading.
-    CImg<T>& assign(const T *const values, const unsigned int size_x, const unsigned int size_y,
-                    const unsigned int size_z, const unsigned int size_c, const bool is_shared) {
-      const size_t siz = (size_t)size_x*size_y*size_z*size_c;
-      if (!values || !siz) return assign();
-      if (!is_shared) { if (_is_shared) assign(); assign(values,size_x,size_y,size_z,size_c); }
-      else {
-        if (!_is_shared) {
-          if (values + siz<_data || values>=_data + size()) assign();
-          else cimg::warn(_cimg_instance
-                          "assign(): Shared image instance has overlapping memory.",
-                          cimg_instance);
-        }
-        _width = size_x; _height = size_y; _depth = size_z; _spectrum = size_c; _is_shared = true;
-        _data = const_cast<T*>(values);
-      }
-      return *this;
-    }
-
-    //! Construct image from reading an image file \inplace.
-    /**
-       In-place version of the constructor CImg(const char*).
-    **/
-    CImg<T>& assign(const char *const filename) {
-      return load(filename);
-    }
-
-    //! Construct image copy \inplace.
-    /**
-       In-place version of the constructor CImg(const CImg<t>&).
-    **/
-    template<typename t>
-    CImg<T>& assign(const CImg<t>& img) {
-      return assign(img._data,img._width,img._height,img._depth,img._spectrum);
-    }
-
-    //! In-place version of the advanced copy constructor.
-    /**
-       In-place version of the constructor CImg(const CImg<t>&,bool).
-     **/
-    template<typename t>
-    CImg<T>& assign(const CImg<t>& img, const bool is_shared) {
-      return assign(img._data,img._width,img._height,img._depth,img._spectrum,is_shared);
-    }
-
-    //! Construct image with dimensions borrowed from another image \inplace.
-    /**
-       In-place version of the constructor CImg(const CImg<t>&,const char*).
-    **/
-    template<typename t>
-    CImg<T>& assign(const CImg<t>& img, const char *const dimensions) {
-      if (!dimensions || !*dimensions) return assign(img._width,img._height,img._depth,img._spectrum);
-      unsigned int siz[4] = { 0,1,1,1 }, k = 0;
-      CImg<charT> item(256);
-      for (const char *s = dimensions; *s && k<4; ++k) {
-        if (cimg_sscanf(s,"%255[^0-9%xyzvwhdcXYZVWHDC]",item._data)>0) s+=std::strlen(item);
-        if (*s) {
-          unsigned int val = 0; char sep = 0;
-          if (cimg_sscanf(s,"%u%c",&val,&sep)>0) {
-            if (sep=='%') siz[k] = val*(k==0?_width:k==1?_height:k==2?_depth:_spectrum)/100;
-            else siz[k] = val;
-            while (*s>='0' && *s<='9') ++s;
-            if (sep=='%') ++s;
-          } else switch (cimg::lowercase(*s)) {
-          case 'x' : case 'w' : siz[k] = img._width; ++s; break;
-          case 'y' : case 'h' : siz[k] = img._height; ++s; break;
-          case 'z' : case 'd' : siz[k] = img._depth; ++s; break;
-          case 'c' : case 's' : siz[k] = img._spectrum; ++s; break;
-          default :
-            throw CImgArgumentException(_cimg_instance
-                                        "assign(): Invalid character '%c' detected in specified dimension string '%s'.",
-                                        cimg_instance,
-                                        *s,dimensions);
-          }
-        }
-      }
-      return assign(siz[0],siz[1],siz[2],siz[3]);
-    }
-
-    //! Construct image with dimensions borrowed from another image and initialize pixel values \inplace.
-    /**
-       In-place version of the constructor CImg(const CImg<t>&,const char*,T).
-    **/
-    template<typename t>
-    CImg<T>& assign(const CImg<t>& img, const char *const dimensions, const T& value) {
-      return assign(img,dimensions).fill(value);
-    }
-
-    //! Construct image from a display window \inplace.
-    /**
-       In-place version of the constructor CImg(const CImgDisplay&).
-    **/
-    CImg<T>& assign(const CImgDisplay &disp) {
-      disp.snapshot(*this);
-      return *this;
-    }
-
-    //! Construct empty image \inplace.
-    /**
-       Equivalent to assign().
-       \note
-       - It has been defined for compatibility with STL naming conventions.
-    **/
-    CImg<T>& clear() {
-      return assign();
-    }
-
-    //! Transfer content of an image instance into another one.
-    /**
-       Transfer the dimensions and the pixel buffer content of an image instance into another one,
-       and replace instance by an empty image. It avoids the copy of the pixel buffer
-       when possible.
-       \param img Destination image.
-       \note
-       - Pixel types \c T and \c t of source and destination images can be different, though the process is
-         designed to be instantaneous when \c T and \c t are the same.
-       \par Example
-       \code
-       CImg<float> src(256,256,1,3,0), // Construct a 256x256x1x3 (color) image filled with value '0'.
-                   dest(16,16);        // Construct a 16x16x1x1 (scalar) image.
-       src.move_to(dest);              // Now, 'src' is empty and 'dest' is the 256x256x1x3 image.
-       \endcode
-    **/
-    template<typename t>
-    CImg<t>& move_to(CImg<t>& img) {
-      img.assign(*this);
-      assign();
-      return img;
-    }
-
-    //! Transfer content of an image instance into another one \specialization.
-    CImg<T>& move_to(CImg<T>& img) {
-      if (_is_shared || img._is_shared) img.assign(*this);
-      else swap(img);
-      assign();
-      return img;
-    }
-
-    //! Transfer content of an image instance into a new image in an image list.
-    /**
-       Transfer the dimensions and the pixel buffer content of an image instance
-       into a newly inserted image at position \c pos in specified \c CImgList<t> instance.
-       \param list Destination list.
-       \param pos Position of the newly inserted image in the list.
-       \note
-       - When optional parameter \c pos is ommited, the image instance is transfered as a new
-         image at the end of the specified \c list.
-       - It is convenient to sequentially insert new images into image lists, with no
-         additional copies of memory buffer.
-       \par Example
-       \code
-       CImgList<float> list;             // Construct an empty image list.
-       CImg<float> img("reference.jpg"); // Read image from filename.
-       img.move_to(list);                // Transfer image content as a new item in the list (no buffer copy).
-       \endcode
-    **/
-    template<typename t>
-    CImgList<t>& move_to(CImgList<t>& list, const unsigned int pos=~0U) {
-      const unsigned int npos = pos>list._width?list._width:pos;
-      move_to(list.insert(1,npos)[npos]);
-      return list;
-    }
-
-    //! Swap fields of two image instances.
-    /**
-      \param img Image to swap fields with.
-      \note
-      - It can be used to interchange the content of two images in a very fast way. Can be convenient when dealing
-        with algorithms requiring two swapping buffers.
-      \par Example
-      \code
-      CImg<float> img1("lena.jpg"),
-                  img2("milla.jpg");
-      img1.swap(img2);               // Now, 'img1' is 'milla' and 'img2' is 'lena'.
-      \endcode
-    **/
-    CImg<T>& swap(CImg<T>& img) {
-      cimg::swap(_width,img._width,_height,img._height,_depth,img._depth,_spectrum,img._spectrum);
-      cimg::swap(_data,img._data);
-      cimg::swap(_is_shared,img._is_shared);
-      return img;
-    }
-
-    //! Return a reference to an empty image.
-    /**
-       \note
-       This function is useful mainly to declare optional parameters having type \c CImg<T> in functions prototypes,
-       e.g.
-       \code
-       void f(const int x=0, const int y=0, const CImg<float>& img=CImg<float>::empty());
-       \endcode
-     **/
-    static CImg<T>& empty() {
-      static CImg<T> _empty;
-      return _empty.assign();
-    }
-
-    //! Return a reference to an empty image \const.
-    static const CImg<T>& const_empty() {
-      static const CImg<T> _empty;
-      return _empty;
-    }
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Overloaded Operators
-    //@{
-    //------------------------------------------
-
-    //! Access to a pixel value.
-    /**
-       Return a reference to a located pixel value of the image instance,
-       being possibly \e const, whether the image instance is \e const or not.
-       This is the standard method to get/set pixel values in \c CImg<T> images.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Range of pixel coordinates start from <tt>(0,0,0,0)</tt> to
-         <tt>(width() - 1,height() - 1,depth() - 1,spectrum() - 1)</tt>.
-       - Due to the particular arrangement of the pixel buffers defined in %CImg, you can omit one coordinate if the
-         corresponding dimension is equal to \c 1.
-         For instance, pixels of a 2d image (depth() equal to \c 1) can be accessed by <tt>img(x,y,c)</tt> instead of
-         <tt>img(x,y,0,c)</tt>.
-       \warning
-       - There is \e no boundary checking done in this operator, to make it as fast as possible.
-         You \e must take care of out-of-bounds access by yourself, if necessary.
-         For debuging purposes, you may want to define macro \c 'cimg_verbosity'>=3 to enable additional boundary
-         checking operations in this operator. In that case, warning messages will be printed on the error output
-         when accessing out-of-bounds pixels.
-       \par Example
-       \code
-       CImg<float> img(100,100,1,3,0); // Construct a 100x100x1x3 (color) image with pixels set to '0'.
-       const float
-          valR = img(10,10,0,0), // Read red value at coordinates (10,10).
-          valG = img(10,10,0,1), // Read green value at coordinates (10,10)
-          valB = img(10,10,2),   // Read blue value at coordinates (10,10) (Z-coordinate can be omitted).
-          avg = (valR + valG + valB)/3; // Compute average pixel value.
-       img(10,10,0) = img(10,10,1) = img(10,10,2) = avg; // Replace the color pixel (10,10) by the average grey value.
-       \endcode
-    **/
-#if cimg_verbosity>=3
-    T& operator()(const unsigned int x, const unsigned int y=0,
-                  const unsigned int z=0, const unsigned int c=0) {
-      const ulongT off = (ulongT)offset(x,y,z,c);
-      if (!_data || off>=size()) {
-        cimg::warn(_cimg_instance
-                   "operator(): Invalid pixel request, at coordinates (%d,%d,%d,%d) [offset=%u].",
-                   cimg_instance,
-                   (int)x,(int)y,(int)z,(int)c,off);
-        return *_data;
-      }
-      else return _data[off];
-    }
-
-    //! Access to a pixel value \const.
-    const T& operator()(const unsigned int x, const unsigned int y=0,
-                        const unsigned int z=0, const unsigned int c=0) const {
-      return const_cast<CImg<T>*>(this)->operator()(x,y,z,c);
-    }
-
-    //! Access to a pixel value.
-    /**
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param wh Precomputed offset, must be equal to <tt>width()*\ref height()</tt>.
-       \param whd Precomputed offset, must be equal to <tt>width()*\ref height()*\ref depth()</tt>.
-       \note
-       - Similar to (but faster than) operator()().
-         It uses precomputed offsets to optimize memory access. You may use it to optimize
-         the reading/writing of several pixel values in the same image (e.g. in a loop).
-     **/
-    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
-                  const ulongT wh, const ulongT whd=0) {
-      cimg::unused(wh,whd);
-      return (*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value \const.
-    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
-                        const ulongT wh, const ulongT whd=0) const {
-      cimg::unused(wh,whd);
-      return (*this)(x,y,z,c);
-    }
-#else
-    T& operator()(const unsigned int x) {
-      return _data[x];
-    }
-
-    const T& operator()(const unsigned int x) const {
-      return _data[x];
-    }
-
-    T& operator()(const unsigned int x, const unsigned int y) {
-      return _data[x + y*_width];
-    }
-
-    const T& operator()(const unsigned int x, const unsigned int y) const {
-      return _data[x + y*_width];
-    }
-
-    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z) {
-      return _data[x + y*(ulongT)_width + z*(ulongT)_width*_height];
-   }
-
-    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z) const {
-      return _data[x + y*(ulongT)_width + z*(ulongT)_width*_height];
-    }
-
-    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c) {
-      return _data[x + y*(ulongT)_width + z*(ulongT)_width*_height + c*(ulongT)_width*_height*_depth];
-    }
-
-    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c) const {
-      return _data[x + y*(ulongT)_width + z*(ulongT)_width*_height + c*(ulongT)_width*_height*_depth];
-    }
-
-    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int,
-                  const ulongT wh) {
-      return _data[x + y*_width + z*wh];
-    }
-
-    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int,
-                        const ulongT wh) const {
-      return _data[x + y*_width + z*wh];
-    }
-
-    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
-                  const ulongT wh, const ulongT whd) {
-      return _data[x + y*_width + z*wh + c*whd];
-    }
-
-    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
-                        const ulongT wh, const ulongT whd) const {
-      return _data[x + y*_width + z*wh + c*whd];
-    }
-#endif
-
-    //! Implicitely cast an image into a \c T*.
-    /**
-       Implicitely cast a \c CImg<T> instance into a \c T* or \c const \c T* pointer, whether the image instance
-       is \e const or not. The returned pointer points on the first value of the image pixel buffer.
-       \note
-       - It simply returns the pointer data() to the pixel buffer.
-       - This implicit conversion is convenient to test the empty state of images (data() being \c 0 in this case), e.g.
-       \code
-       CImg<float> img1(100,100), img2; // 'img1' is a 100x100 image, 'img2' is an empty image.
-       if (img1) {                      // Test succeeds, 'img1' is not an empty image.
-         if (!img2) {                   // Test succeeds, 'img2' is an empty image.
-           std::printf("'img1' is not empty, 'img2' is empty.");
-         }
-       }
-       \endcode
-       - It also allows to use brackets to access pixel values, without need for a \c CImg<T>::operator[](), e.g.
-       \code
-       CImg<float> img(100,100);
-       const float value = img[99]; // Access to value of the last pixel on the first row.
-       img[510] = 255;              // Set pixel value at (10,5).
-       \endcode
-    **/
-    operator T*() {
-      return _data;
-    }
-
-    //! Implicitely cast an image into a \c T* \const.
-    operator const T*() const {
-      return _data;
-    }
-
-    //! Assign a value to all image pixels.
-    /**
-       Assign specified \c value to each pixel value of the image instance.
-       \param value Value that will be assigned to image pixels.
-       \note
-       - The image size is never modified.
-       - The \c value may be casted to pixel type \c T if necessary.
-       \par Example
-       \code
-       CImg<char> img(100,100); // Declare image (with garbage values).
-       img = 0;                 // Set all pixel values to '0'.
-       img = 1.2;               // Set all pixel values to '1' (cast of '1.2' as a 'char').
-       \endcode
-    **/
-    CImg<T>& operator=(const T& value) {
-      return fill(value);
-    }
-
-    //! Assign pixels values from a specified expression.
-    /**
-       Initialize all pixel values from the specified string \c expression.
-       \param expression Value string describing the way pixel values are set.
-       \note
-       - String parameter \c expression may describe different things:
-         - If \c expression is a list of values (as in \c "1,2,3,8,3,2"), or a formula (as in \c "(x*y)%255"),
-           the pixel values are set from specified \c expression and the image size is not modified.
-         - If \c expression is a filename (as in \c "reference.jpg"), the corresponding image file is loaded and
-           replace the image instance. The image size is modified if necessary.
-       \par Example
-       \code
-       CImg<float> img1(100,100), img2(img1), img3(img1); // Declare 3 scalar images 100x100 with unitialized values.
-       img1 = "0,50,100,150,200,250,200,150,100,50"; // Set pixel values of 'img1' from a value sequence.
-       img2 = "10*((x*y)%25)";                       // Set pixel values of 'img2' from a formula.
-       img3 = "reference.jpg";                       // Set pixel values of 'img3' from a file (image size is modified).
-       (img1,img2,img3).display();
-       \endcode
-       \image html ref_operator_eq.jpg
-    **/
-    CImg<T>& operator=(const char *const expression) {
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      try {
-        _fill(expression,true,true,0,0,"operator=",0);
-      } catch (CImgException&) {
-        cimg::exception_mode(omode);
-        load(expression);
-      }
-      cimg::exception_mode(omode);
-      return *this;
-    }
-
-    //! Copy an image into the current image instance.
-    /**
-       Similar to the in-place copy constructor assign(const CImg<t>&).
-    **/
-    template<typename t>
-    CImg<T>& operator=(const CImg<t>& img) {
-      return assign(img);
-    }
-
-    //! Copy an image into the current image instance \specialization.
-    CImg<T>& operator=(const CImg<T>& img) {
-      return assign(img);
-    }
-
-    //! Copy the content of a display window to the current image instance.
-    /**
-       Similar to assign(const CImgDisplay&).
-    **/
-    CImg<T>& operator=(const CImgDisplay& disp) {
-      disp.snapshot(*this);
-      return *this;
-    }
-
-    //! In-place addition operator.
-    /**
-       Add specified \c value to all pixels of an image instance.
-       \param value Value to add.
-       \note
-       - Resulting pixel values are casted to fit the pixel type \c T.
-         For instance, adding \c 0.2 to a \c CImg<char> is possible but does nothing indeed.
-       - Overflow values are treated as with standard C++ numeric types. For instance,
-       \code
-       CImg<unsigned char> img(100,100,1,1,255); // Construct a 100x100 image with pixel values '255'.
-       img+=1;                                   // Add '1' to each pixels -> Overflow.
-       // here all pixels of image 'img' are equal to '0'.
-       \endcode
-       - To prevent value overflow, you may want to consider pixel type \c T as \c float or \c double,
-         and use cut() after addition.
-       \par Example
-       \code
-       CImg<unsigned char> img1("reference.jpg"); // Load a 8-bits RGB image (values in [0,255]).
-       CImg<float> img2(img1); // Construct a float-valued copy of 'img1'.
-       img2+=100; // Add '100' to pixel values -> goes out of [0,255] but no problems with floats.
-       img2.cut(0,255); // Cut values in [0,255] to fit the 'unsigned char' constraint.
-       img1 = img2; // Rewrite safe result in 'unsigned char' version 'img1'.
-       const CImg<unsigned char> img3 = (img1 + 100).cut(0,255); // Do the same in a more simple and elegant way.
-       (img1,img2,img3).display();
-       \endcode
-       \image html ref_operator_plus.jpg
-     **/
-    template<typename t>
-    CImg<T>& operator+=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(*ptrd + value);
-      return *this;
-    }
-
-    //! In-place addition operator.
-    /**
-       Add values to image pixels, according to the specified string \c expression.
-       \param expression Value string describing the way pixel values are added.
-       \note
-       - Similar to operator=(const char*), except that it adds values to the pixels of the current image instance,
-         instead of assigning them.
-    **/
-    CImg<T>& operator+=(const char *const expression) {
-      return *this+=(+*this)._fill(expression,true,true,0,0,"operator+=",this);
-    }
-
-    //! In-place addition operator.
-    /**
-       Add values to image pixels, according to the values of the input image \c img.
-       \param img Input image to add.
-       \note
-       - The size of the image instance is never modified.
-       - It is not mandatory that input image \c img has the same size as the image instance.
-         If less values are available in \c img, then the values are added periodically. For instance, adding one
-         WxH scalar image (spectrum() equal to \c 1) to one WxH color image (spectrum() equal to \c 3)
-         means each color channel will be incremented with the same values at the same locations.
-       \par Example
-       \code
-       CImg<float> img1("reference.jpg"); // Load a RGB color image (img1.spectrum()==3)
-       // Construct a scalar shading (img2.spectrum()==1).
-       const CImg<float> img2(img1.width(),img.height(),1,1,"255*(x/w)^2");
-       img1+=img2; // Add shading to each channel of 'img1'.
-       img1.cut(0,255); // Prevent [0,255] overflow.
-       (img2,img1).display();
-       \endcode
-       \image html ref_operator_plus1.jpg
-    **/
-    template<typename t>
-    CImg<T>& operator+=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this+=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)(*ptrd + *(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd + *(ptrs++));
-      }
-      return *this;
-    }
-
-    //! In-place increment operator (prefix).
-    /**
-       Add \c 1 to all image pixels, and return a reference to the current incremented image instance.
-       \note
-       - Writing \c ++img is equivalent to \c img+=1.
-     **/
-    CImg<T>& operator++() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) ++*ptrd;
-      return *this;
-    }
-
-    //! In-place increment operator (postfix).
-    /**
-       Add \c 1 to all image pixels, and return a new copy of the initial (pre-incremented) image instance.
-       \note
-       - Use the prefixed version operator++() if you don't need a copy of the initial
-         (pre-incremented) image instance, since a useless image copy may be expensive in terms of memory usage.
-     **/
-    CImg<T> operator++(int) {
-      const CImg<T> copy(*this,false);
-      ++*this;
-      return copy;
-    }
-
-    //! Return a non-shared copy of the image instance.
-    /**
-       \note
-       - Use this operator to ensure you get a non-shared copy of an image instance with same pixel type \c T.
-         Indeed, the usual copy constructor CImg<T>(const CImg<T>&) returns a shared copy of a shared input image,
-         and it may be not desirable to work on a regular copy (e.g. for a resize operation) if you have no
-         information about the shared state of the input image.
-       - Writing \c (+img) is equivalent to \c CImg<T>(img,false).
-    **/
-    CImg<T> operator+() const {
-      return CImg<T>(*this,false);
-    }
-
-    //! Addition operator.
-    /**
-       Similar to operator+=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-     **/
-    template<typename t>
-    CImg<_cimg_Tt> operator+(const t value) const {
-      return CImg<_cimg_Tt>(*this,false)+=value;
-    }
-
-    //! Addition operator.
-    /**
-       Similar to operator+=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-     **/
-    CImg<Tfloat> operator+(const char *const expression) const {
-      return CImg<Tfloat>(*this,false)+=expression;
-    }
-
-    //! Addition operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-     **/
-    template<typename t>
-    CImg<_cimg_Tt> operator+(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false)+=img;
-    }
-
-    //! In-place substraction operator.
-    /**
-       Similar to operator+=(const t), except that it performs a substraction instead of an addition.
-     **/
-    template<typename t>
-    CImg<T>& operator-=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(*ptrd - value);
-      return *this;
-    }
-
-    //! In-place substraction operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a substraction instead of an addition.
-     **/
-    CImg<T>& operator-=(const char *const expression) {
-      return *this-=(+*this)._fill(expression,true,true,0,0,"operator-=",this);
-    }
-
-    //! In-place substraction operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a substraction instead of an addition.
-     **/
-    template<typename t>
-    CImg<T>& operator-=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this-=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)(*ptrd - *(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd - *(ptrs++));
-      }
-      return *this;
-    }
-
-    //! In-place decrement operator (prefix).
-    /**
-       Similar to operator++(), except that it performs a decrement instead of an increment.
-    **/
-    CImg<T>& operator--() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) *ptrd = *ptrd - (T)1;
-      return *this;
-    }
-
-    //! In-place decrement operator (postfix).
-    /**
-       Similar to operator++(int), except that it performs a decrement instead of an increment.
-    **/
-    CImg<T> operator--(int) {
-      const CImg<T> copy(*this,false);
-      --*this;
-      return copy;
-    }
-
-    //! Replace each pixel by its opposite value.
-    /**
-       \note
-       - If the computed opposite values are out-of-range, they are treated as with standard C++ numeric types.
-         For instance, the \c unsigned \c char opposite of \c 1 is \c 255.
-       \par Example
-       \code
-       const CImg<unsigned char>
-         img1("reference.jpg"),   // Load a RGB color image.
-         img2 = -img1;            // Compute its opposite (in 'unsigned char').
-       (img1,img2).display();
-       \endcode
-       \image html ref_operator_minus.jpg
-     **/
-    CImg<T> operator-() const {
-      return CImg<T>(_width,_height,_depth,_spectrum,(T)0)-=*this;
-    }
-
-    //! Substraction operator.
-    /**
-       Similar to operator-=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator-(const t value) const {
-      return CImg<_cimg_Tt>(*this,false)-=value;
-    }
-
-    //! Substraction operator.
-    /**
-       Similar to operator-=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    CImg<Tfloat> operator-(const char *const expression) const {
-      return CImg<Tfloat>(*this,false)-=expression;
-    }
-
-    //! Substraction operator.
-    /**
-       Similar to operator-=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator-(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false)-=img;
-    }
-
-    //! In-place multiplication operator.
-    /**
-       Similar to operator+=(const t), except that it performs a multiplication instead of an addition.
-     **/
-    template<typename t>
-    CImg<T>& operator*=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=262144))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(*ptrd * value);
-      return *this;
-    }
-
-    //! In-place multiplication operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a multiplication instead of an addition.
-     **/
-    CImg<T>& operator*=(const char *const expression) {
-      return mul((+*this)._fill(expression,true,true,0,0,"operator*=",this));
-    }
-
-    //! In-place multiplication operator.
-    /**
-       Replace the image instance by the matrix multiplication between the image instance and the specified matrix
-       \c img.
-       \param img Second operand of the matrix multiplication.
-       \note
-       - It does \e not compute a pointwise multiplication between two images. For this purpose, use
-         mul(const CImg<t>&) instead.
-       - The size of the image instance can be modified by this operator.
-       \par Example
-       \code
-       CImg<float> A(2,2,1,1, 1,2,3,4);   // Construct 2x2 matrix A = [1,2;3,4].
-       const CImg<float> X(1,2,1,1, 1,2); // Construct 1x2 vector X = [1;2].
-       A*=X;                              // Assign matrix multiplication A*X to 'A'.
-       // 'A' is now a 1x2 vector whose values are [5;11].
-       \endcode
-    **/
-    template<typename t>
-    CImg<T>& operator*=(const CImg<t>& img) {
-      return ((*this)*img).move_to(*this);
-    }
-
-    //! Multiplication operator.
-    /**
-       Similar to operator*=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator*(const t value) const {
-      return CImg<_cimg_Tt>(*this,false)*=value;
-    }
-
-    //! Multiplication operator.
-    /**
-       Similar to operator*=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    CImg<Tfloat> operator*(const char *const expression) const {
-      return CImg<Tfloat>(*this,false)*=expression;
-    }
-
-    //! Multiplication operator.
-    /**
-       Similar to operator*=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator*(const CImg<t>& img) const {
-      if (_width!=img._height || _depth!=1 || _spectrum!=1)
-        throw CImgArgumentException(_cimg_instance
-                                    "operator*(): Invalid multiplication of instance by specified "
-                                    "matrix (%u,%u,%u,%u,%p)",
-                                    cimg_instance,
-                                    img._width,img._height,img._depth,img._spectrum,img._data);
-      CImg<_cimg_Tt> res(img._width,_height);
-#ifdef cimg_use_openmp
-      cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(size()>1024 && img.size()>1024))
-      cimg_forXY(res,i,j) {
-        _cimg_Ttdouble value = 0; cimg_forX(*this,k) value+=(*this)(k,j)*img(i,k); res(i,j) = (_cimg_Tt)value;
-      }
-#else
-      _cimg_Tt *ptrd = res._data;
-      cimg_forXY(res,i,j) {
-        _cimg_Ttdouble value = 0; cimg_forX(*this,k) value+=(*this)(k,j)*img(i,k); *(ptrd++) = (_cimg_Tt)value;
-      }
-#endif
-      return res;
-    }
-
-    //! In-place division operator.
-    /**
-       Similar to operator+=(const t), except that it performs a division instead of an addition.
-     **/
-    template<typename t>
-    CImg<T>& operator/=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(*ptrd / value);
-      return *this;
-    }
-
-    //! In-place division operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a division instead of an addition.
-     **/
-    CImg<T>& operator/=(const char *const expression) {
-      return div((+*this)._fill(expression,true,true,0,0,"operator/=",this));
-    }
-
-    //! In-place division operator.
-    /**
-       Replace the image instance by the (right) matrix division between the image instance and the specified
-       matrix \c img.
-       \param img Second operand of the matrix division.
-       \note
-       - It does \e not compute a pointwise division between two images. For this purpose, use
-         div(const CImg<t>&) instead.
-       - It returns the matrix operation \c A*inverse(img).
-       - The size of the image instance can be modified by this operator.
-     **/
-    template<typename t>
-    CImg<T>& operator/=(const CImg<t>& img) {
-      return (*this*img.get_invert()).move_to(*this);
-    }
-
-    //! Division operator.
-    /**
-       Similar to operator/=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator/(const t value) const {
-      return CImg<_cimg_Tt>(*this,false)/=value;
-    }
-
-    //! Division operator.
-    /**
-       Similar to operator/=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    CImg<Tfloat> operator/(const char *const expression) const {
-      return CImg<Tfloat>(*this,false)/=expression;
-    }
-
-    //! Division operator.
-    /**
-       Similar to operator/=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator/(const CImg<t>& img) const {
-      return (*this)*img.get_invert();
-    }
-
-    //! In-place modulo operator.
-    /**
-       Similar to operator+=(const t), except that it performs a modulo operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator%=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=16384))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::mod(*ptrd,(T)value);
-      return *this;
-    }
-
-    //! In-place modulo operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a modulo operation instead of an addition.
-    **/
-    CImg<T>& operator%=(const char *const expression) {
-      return *this%=(+*this)._fill(expression,true,true,0,0,"operator%=",this);
-    }
-
-    //! In-place modulo operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a modulo operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator%=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this%=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = cimg::mod(*ptrd,(T)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = cimg::mod(*ptrd,(T)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Modulo operator.
-    /**
-       Similar to operator%=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator%(const t value) const {
-      return CImg<_cimg_Tt>(*this,false)%=value;
-    }
-
-    //! Modulo operator.
-    /**
-       Similar to operator%=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    CImg<Tfloat> operator%(const char *const expression) const {
-      return CImg<Tfloat>(*this,false)%=expression;
-    }
-
-    //! Modulo operator.
-    /**
-       Similar to operator%=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image may be a superset of the initial pixel type \c T, if necessary.
-    **/
-    template<typename t>
-    CImg<_cimg_Tt> operator%(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false)%=img;
-    }
-
-    //! In-place bitwise AND operator.
-    /**
-       Similar to operator+=(const t), except that it performs a bitwise AND operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator&=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)((ulongT)*ptrd & (ulongT)value);
-      return *this;
-    }
-
-    //! In-place bitwise AND operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a bitwise AND operation instead of an addition.
-    **/
-    CImg<T>& operator&=(const char *const expression) {
-      return *this&=(+*this)._fill(expression,true,true,0,0,"operator&=",this);
-    }
-
-    //! In-place bitwise AND operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a bitwise AND operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator&=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this&=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)((ulongT)*ptrd & (ulongT)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((ulongT)*ptrd & (ulongT)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Bitwise AND operator.
-    /**
-       Similar to operator&=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator&(const t value) const {
-      return (+*this)&=value;
-    }
-
-    //! Bitwise AND operator.
-    /**
-       Similar to operator&=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    CImg<T> operator&(const char *const expression) const {
-      return (+*this)&=expression;
-    }
-
-    //! Bitwise AND operator.
-    /**
-       Similar to operator&=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator&(const CImg<t>& img) const {
-      return (+*this)&=img;
-    }
-
-    //! In-place bitwise OR operator.
-    /**
-       Similar to operator+=(const t), except that it performs a bitwise OR operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator|=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)((ulongT)*ptrd | (ulongT)value);
-      return *this;
-    }
-
-    //! In-place bitwise OR operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a bitwise OR operation instead of an addition.
-    **/
-    CImg<T>& operator|=(const char *const expression) {
-      return *this|=(+*this)._fill(expression,true,true,0,0,"operator|=",this);
-    }
-
-    //! In-place bitwise OR operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a bitwise OR operation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator|=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this|=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)((ulongT)*ptrd | (ulongT)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((ulongT)*ptrd | (ulongT)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Bitwise OR operator.
-    /**
-       Similar to operator|=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator|(const t value) const {
-      return (+*this)|=value;
-    }
-
-    //! Bitwise OR operator.
-    /**
-       Similar to operator|=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    CImg<T> operator|(const char *const expression) const {
-      return (+*this)|=expression;
-    }
-
-    //! Bitwise OR operator.
-    /**
-       Similar to operator|=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator|(const CImg<t>& img) const {
-      return (+*this)|=img;
-    }
-
-    //! In-place bitwise XOR operator.
-    /**
-       Similar to operator+=(const t), except that it performs a bitwise XOR operation instead of an addition.
-       \warning
-       - It does \e not compute the \e power of pixel values. For this purpose, use pow(const t) instead.
-    **/
-    template<typename t>
-    CImg<T>& operator^=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)((ulongT)*ptrd ^ (ulongT)value);
-      return *this;
-    }
-
-    //! In-place bitwise XOR operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a bitwise XOR operation instead of an addition.
-       \warning
-       - It does \e not compute the \e power of pixel values. For this purpose, use pow(const char*) instead.
-    **/
-    CImg<T>& operator^=(const char *const expression) {
-      return *this^=(+*this)._fill(expression,true,true,0,0,"operator^=",this);
-    }
-
-    //! In-place bitwise XOR operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a bitwise XOR operation instead of an addition.
-       \warning
-       - It does \e not compute the \e power of pixel values. For this purpose, use pow(const CImg<t>&) instead.
-    **/
-    template<typename t>
-    CImg<T>& operator^=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this^=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)((ulongT)*ptrd ^ (ulongT)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((ulongT)*ptrd ^ (ulongT)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Bitwise XOR operator.
-    /**
-       Similar to operator^=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator^(const t value) const {
-      return (+*this)^=value;
-    }
-
-    //! Bitwise XOR operator.
-    /**
-       Similar to operator^=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    CImg<T> operator^(const char *const expression) const {
-      return (+*this)^=expression;
-    }
-
-    //! Bitwise XOR operator.
-    /**
-       Similar to operator^=(const CImg<t>&), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator^(const CImg<t>& img) const {
-      return (+*this)^=img;
-    }
-
-    //! In-place bitwise left shift operator.
-    /**
-       Similar to operator+=(const t), except that it performs a bitwise left shift instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator<<=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(((longT)*ptrd) << (int)value);
-      return *this;
-    }
-
-    //! In-place bitwise left shift operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a bitwise left shift instead of an addition.
-    **/
-    CImg<T>& operator<<=(const char *const expression) {
-      return *this<<=(+*this)._fill(expression,true,true,0,0,"operator<<=",this);
-    }
-
-    //! In-place bitwise left shift operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a bitwise left shift instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator<<=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this^=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)((longT)*ptrd << (int)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((longT)*ptrd << (int)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Bitwise left shift operator.
-    /**
-       Similar to operator<<=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator<<(const t value) const {
-      return (+*this)<<=value;
-    }
-
-    //! Bitwise left shift operator.
-    /**
-       Similar to operator<<=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    CImg<T> operator<<(const char *const expression) const {
-      return (+*this)<<=expression;
-    }
-
-    //! Bitwise left shift operator.
-    /**
-       Similar to operator<<=(const CImg<t>&), except that it returns a new image instance instead of
-       operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator<<(const CImg<t>& img) const {
-      return (+*this)<<=img;
-    }
-
-    //! In-place bitwise right shift operator.
-    /**
-       Similar to operator+=(const t), except that it performs a bitwise right shift instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator>>=(const t value) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)(((longT)*ptrd) >> (int)value);
-      return *this;
-    }
-
-    //! In-place bitwise right shift operator.
-    /**
-       Similar to operator+=(const char*), except that it performs a bitwise right shift instead of an addition.
-    **/
-    CImg<T>& operator>>=(const char *const expression) {
-      return *this>>=(+*this)._fill(expression,true,true,0,0,"operator>>=",this);
-    }
-
-    //! In-place bitwise right shift operator.
-    /**
-       Similar to operator+=(const CImg<t>&), except that it performs a bitwise right shift instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& operator>>=(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return *this^=+img;
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)((longT)*ptrd >> (int)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((longT)*ptrd >> (int)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Bitwise right shift operator.
-    /**
-       Similar to operator>>=(const t), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator>>(const t value) const {
-      return (+*this)>>=value;
-    }
-
-    //! Bitwise right shift operator.
-    /**
-       Similar to operator>>=(const char*), except that it returns a new image instance instead of operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    CImg<T> operator>>(const char *const expression) const {
-      return (+*this)>>=expression;
-    }
-
-    //! Bitwise right shift operator.
-    /**
-       Similar to operator>>=(const CImg<t>&), except that it returns a new image instance instead of
-       operating in-place.
-       The pixel type of the returned image is \c T.
-    **/
-    template<typename t>
-    CImg<T> operator>>(const CImg<t>& img) const {
-      return (+*this)>>=img;
-    }
-
-    //! Bitwise inversion operator.
-    /**
-       Similar to operator-(), except that it compute the bitwise inverse instead of the opposite value.
-    **/
-    CImg<T> operator~() const {
-      CImg<T> res(_width,_height,_depth,_spectrum);
-      const T *ptrs = _data;
-      cimg_for(res,ptrd,T) { const ulongT value = (ulongT)*(ptrs++); *ptrd = (T)~value; }
-      return res;
-    }
-
-    //! Test if all pixels of an image have the same value.
-    /**
-       Return \c true is all pixels of the image instance are equal to the specified \c value.
-       \param value Reference value to compare with.
-    **/
-    template<typename t>
-    bool operator==(const t value) const {
-      if (is_empty()) return false;
-      typedef _cimg_Tt Tt;
-      bool is_equal = true;
-      for (T *ptrd = _data + size(); is_equal && ptrd>_data; is_equal = ((Tt)*(--ptrd)==(Tt)value)) {}
-      return is_equal;
-    }
-
-    //! Test if all pixel values of an image follow a specified expression.
-    /**
-       Return \c true is all pixels of the image instance are equal to the specified \c expression.
-       \param expression Value string describing the way pixel values are compared.
-    **/
-    bool operator==(const char *const expression) const {
-      return *this==(+*this)._fill(expression,true,true,0,0,"operator==",this);
-    }
-
-    //! Test if two images have the same size and values.
-    /**
-       Return \c true if the image instance and the input image \c img have the same dimensions and pixel values,
-       and \c false otherwise.
-       \param img Input image to compare with.
-       \note
-       - The pixel buffer pointers data() of the two compared images do not have to be the same for operator==()
-         to return \c true.
-         Only the dimensions and the pixel values matter. Thus, the comparison can be \c true even for different
-         pixel types \c T and \c t.
-       \par Example
-       \code
-       const CImg<float> img1(1,3,1,1, 0,1,2); // Construct a 1x3 vector [0;1;2] (with 'float' pixel values).
-       const CImg<char> img2(1,3,1,1, 0,1,2);  // Construct a 1x3 vector [0;1;2] (with 'char' pixel values).
-       if (img1==img2) {                       // Test succeeds, image dimensions and values are the same.
-         std::printf("'img1' and 'img2' have same dimensions and values.");
-       }
-       \endcode
-    **/
-    template<typename t>
-    bool operator==(const CImg<t>& img) const {
-      typedef _cimg_Tt Tt;
-      const ulongT siz = size();
-      bool is_equal = true;
-      if (siz!=img.size()) return false;
-      t *ptrs = img._data + siz;
-      for (T *ptrd = _data + siz; is_equal && ptrd>_data; is_equal = ((Tt)*(--ptrd)==(Tt)*(--ptrs))) {}
-      return is_equal;
-    }
-
-    //! Test if pixels of an image are all different from a value.
-    /**
-       Return \c true is all pixels of the image instance are different than the specified \c value.
-       \param value Reference value to compare with.
-    **/
-    template<typename t>
-    bool operator!=(const t value) const {
-      return !((*this)==value);
-    }
-
-    //! Test if all pixel values of an image are different from a specified expression.
-    /**
-       Return \c true is all pixels of the image instance are different to the specified \c expression.
-       \param expression Value string describing the way pixel values are compared.
-    **/
-    bool operator!=(const char *const expression) const {
-      return !((*this)==expression);
-    }
-
-    //! Test if two images have different sizes or values.
-    /**
-       Return \c true if the image instance and the input image \c img have different dimensions or pixel values,
-       and \c false otherwise.
-       \param img Input image to compare with.
-       \note
-       - Writing \c img1!=img2 is equivalent to \c !(img1==img2).
-    **/
-    template<typename t>
-    bool operator!=(const CImg<t>& img) const {
-      return !((*this)==img);
-    }
-
-    //! Construct an image list from two images.
-    /**
-       Return a new list of image (\c CImgList instance) containing exactly two elements:
-         - A copy of the image instance, at position [\c 0].
-         - A copy of the specified image \c img, at position [\c 1].
-
-       \param img Input image that will be the second image of the resulting list.
-       \note
-       - The family of operator,() is convenient to easily create list of images, but it is also \e quite \e slow
-         in practice (see warning below).
-       - Constructed lists contain no shared images. If image instance or input image \c img are shared, they are
-         inserted as new non-shared copies in the resulting list.
-       - The pixel type of the returned list may be a superset of the initial pixel type \c T, if necessary.
-       \warning
-       - Pipelining operator,() \c N times will perform \c N copies of the entire content of a (growing) image list.
-         This may become very expensive in terms of speed and used memory. You should avoid using this technique to
-         build a new CImgList instance from several images, if you are seeking for performance.
-         Fast insertions of images in an image list are possible with
-         CImgList<T>::insert(const CImg<t>&,unsigned int,bool) or move_to(CImgList<t>&,unsigned int).
-       \par Example
-       \code
-       const CImg<float>
-          img1("reference.jpg"),
-          img2 = img1.get_mirror('x'),
-          img3 = img2.get_blur(5);
-       const CImgList<float> list = (img1,img2); // Create list of two elements from 'img1' and 'img2'.
-       (list,img3).display();                    // Display image list containing copies of 'img1','img2' and 'img3'.
-       \endcode
-       \image html ref_operator_comma.jpg
-    **/
-    template<typename t>
-    CImgList<_cimg_Tt> operator,(const CImg<t>& img) const {
-      return CImgList<_cimg_Tt>(*this,img);
-    }
-
-    //! Construct an image list from image instance and an input image list.
-    /**
-       Return a new list of images (\c CImgList instance) containing exactly \c list.size() \c + \c 1 elements:
-         - A copy of the image instance, at position [\c 0].
-         - A copy of the specified image list \c list, from positions [\c 1] to [\c list.size()].
-
-       \param list Input image list that will be appended to the image instance.
-       \note
-       - Similar to operator,(const CImg<t>&) const, except that it takes an image list as an argument.
-    **/
-    template<typename t>
-    CImgList<_cimg_Tt> operator,(const CImgList<t>& list) const {
-      return CImgList<_cimg_Tt>(list,false).insert(*this,0);
-    }
-
-    //! Split image along specified axis.
-    /**
-       Return a new list of images (\c CImgList instance) containing the splitted components
-       of the instance image along the specified axis.
-       \param axis Splitting axis (can be '\c x','\c y','\c z' or '\c c')
-       \note
-       - Similar to get_split(char,int) const, with default second argument.
-       \par Example
-       \code
-       const CImg<unsigned char> img("reference.jpg"); // Load a RGB color image.
-       const CImgList<unsigned char> list = (img<'c'); // Get a list of its three R,G,B channels.
-       (img,list).display();
-       \endcode
-       \image html ref_operator_less.jpg
-    **/
-    CImgList<T> operator<(const char axis) const {
-      return get_split(axis);
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Instance Characteristics
-    //@{
-    //-------------------------------------
-
-    //! Return the type of image pixel values as a C string.
-    /**
-       Return a \c char* string containing the usual type name of the image pixel values
-       (i.e. a stringified version of the template parameter \c T).
-       \note
-       - The returned string may contain spaces (as in \c "unsigned char").
-       - If the pixel type \c T does not correspond to a registered type, the string <tt>"unknown"</tt> is returned.
-    **/
-    static const char* pixel_type() {
-      return cimg::type<T>::string();
-    }
-
-    //! Return the number of image columns.
-    /**
-       Return the image width, i.e. the image dimension along the X-axis.
-       \note
-       - The width() of an empty image is equal to \c 0.
-       - width() is typically equal to \c 1 when considering images as \e vectors for matrix calculations.
-       - width() returns an \c int, although the image width is internally stored as an \c unsigned \c int.
-         Using an \c int is safer and prevents arithmetic traps possibly encountered when doing calculations involving
-         \c unsigned \c int variables.
-         Access to the initial \c unsigned \c int variable is possible (though not recommended) by
-         <tt>(*this)._width</tt>.
-    **/
-    int width() const {
-      return (int)_width;
-    }
-
-    //! Return the number of image rows.
-    /**
-       Return the image height, i.e. the image dimension along the Y-axis.
-       \note
-       - The height() of an empty image is equal to \c 0.
-       - height() returns an \c int, although the image height is internally stored as an \c unsigned \c int.
-         Using an \c int is safer and prevents arithmetic traps possibly encountered when doing calculations involving
-         \c unsigned \c int variables.
-         Access to the initial \c unsigned \c int variable is possible (though not recommended) by
-         <tt>(*this)._height</tt>.
-    **/
-    int height() const {
-      return (int)_height;
-    }
-
-    //! Return the number of image slices.
-    /**
-       Return the image depth, i.e. the image dimension along the Z-axis.
-       \note
-       - The depth() of an empty image is equal to \c 0.
-       - depth() is typically equal to \c 1 when considering usual 2d images. When depth()\c > \c 1, the image
-         is said to be \e volumetric.
-       - depth() returns an \c int, although the image depth is internally stored as an \c unsigned \c int.
-         Using an \c int is safer and prevents arithmetic traps possibly encountered when doing calculations involving
-         \c unsigned \c int variables.
-         Access to the initial \c unsigned \c int variable is possible (though not recommended) by
-         <tt>(*this)._depth</tt>.
-    **/
-    int depth() const {
-      return (int)_depth;
-    }
-
-    //! Return the number of image channels.
-    /**
-       Return the number of image channels, i.e. the image dimension along the C-axis.
-       \note
-       - The spectrum() of an empty image is equal to \c 0.
-       - spectrum() is typically equal to \c 1 when considering scalar-valued images, to \c 3
-         for RGB-coded color images, and to \c 4 for RGBA-coded color images (with alpha-channel).
-         The number of channels of an image instance is not limited. The meaning of the pixel values is not linked
-         up to the number of channels (e.g. a 4-channel image may indifferently stands for a RGBA or CMYK color image).
-       - spectrum() returns an \c int, although the image spectrum is internally stored as an \c unsigned \c int.
-         Using an \c int is safer and prevents arithmetic traps possibly encountered when doing calculations involving
-         \c unsigned \c int variables.
-         Access to the initial \c unsigned \c int variable is possible (though not recommended) by
-         <tt>(*this)._spectrum</tt>.
-    **/
-    int spectrum() const {
-      return (int)_spectrum;
-    }
-
-    //! Return the total number of pixel values.
-    /**
-       Return <tt>width()*\ref height()*\ref depth()*\ref spectrum()</tt>,
-       i.e. the total number of values of type \c T in the pixel buffer of the image instance.
-       \note
-       - The size() of an empty image is equal to \c 0.
-       - The allocated memory size for a pixel buffer of a non-shared \c CImg<T> instance is equal to
-         <tt>size()*sizeof(T)</tt>.
-       \par Example
-       \code
-       const CImg<float> img(100,100,1,3);               // Construct new 100x100 color image.
-       if (img.size()==30000)                            // Test succeeds.
-         std::printf("Pixel buffer uses %lu bytes",
-                     img.size()*sizeof(float));
-       \endcode
-    **/
-    ulongT size() const {
-      return (ulongT)_width*_height*_depth*_spectrum;
-    }
-
-    //! Return a pointer to the first pixel value.
-    /**
-       Return a \c T*, or a \c const \c T* pointer to the first value in the pixel buffer of the image instance,
-       whether the instance is \c const or not.
-       \note
-       - The data() of an empty image is equal to \c 0 (null pointer).
-       - The allocated pixel buffer for the image instance starts from \c data()
-         and goes to <tt>data()+\ref size() - 1</tt> (included).
-       - To get the pointer to one particular location of the pixel buffer, use
-         data(unsigned int,unsigned int,unsigned int,unsigned int) instead.
-    **/
-    T* data() {
-      return _data;
-    }
-
-    //! Return a pointer to the first pixel value \const.
-    const T* data() const {
-      return _data;
-    }
-
-    //! Return a pointer to a located pixel value.
-    /**
-       Return a \c T*, or a \c const \c T* pointer to the value located at (\c x,\c y,\c z,\c c) in the pixel buffer
-       of the image instance,
-       whether the instance is \c const or not.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Writing \c img.data(x,y,z,c) is equivalent to <tt>&(img(x,y,z,c))</tt>. Thus, this method has the same
-         properties as operator()(unsigned int,unsigned int,unsigned int,unsigned int).
-     **/
-#if cimg_verbosity>=3
-    T *data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) {
-      const ulongT off = (ulongT)offset(x,y,z,c);
-      if (off>=size())
-        cimg::warn(_cimg_instance
-                   "data(): Invalid pointer request, at coordinates (%u,%u,%u,%u) [offset=%u].",
-                   cimg_instance,
-                   x,y,z,c,off);
-      return _data + off;
-    }
-
-    //! Return a pointer to a located pixel value \const.
-    const T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) const {
-      return const_cast<CImg<T>*>(this)->data(x,y,z,c);
-    }
-#else
-    T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) {
-      return _data + x + (ulongT)y*_width + (ulongT)z*_width*_height + (ulongT)c*_width*_height*_depth;
-    }
-
-    const T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) const {
-      return _data + x + (ulongT)y*_width + (ulongT)z*_width*_height + (ulongT)c*_width*_height*_depth;
-    }
-#endif
-
-    //! Return the offset to a located pixel value, with respect to the beginning of the pixel buffer.
-    /**
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Writing \c img.data(x,y,z,c) is equivalent to <tt>&(img(x,y,z,c)) - img.data()</tt>.
-         Thus, this method has the same properties as operator()(unsigned int,unsigned int,unsigned int,unsigned int).
-       \par Example
-       \code
-       const CImg<float> img(100,100,1,3);      // Define a 100x100 RGB-color image.
-       const long off = img.offset(10,10,0,2);  // Get the offset of the blue value of the pixel located at (10,10).
-       const float val = img[off];              // Get the blue value of this pixel.
-       \endcode
-    **/
-    longT offset(const int x, const int y=0, const int z=0, const int c=0) const {
-      return x + (longT)y*_width + (longT)z*_width*_height + (longT)c*_width*_height*_depth;
-    }
-
-    //! Return a CImg<T>::iterator pointing to the first pixel value.
-    /**
-       \note
-       - Equivalent to data().
-       - It has been mainly defined for compatibility with STL naming conventions.
-     **/
-    iterator begin() {
-      return _data;
-    }
-
-    //! Return a CImg<T>::iterator pointing to the first value of the pixel buffer \const.
-    const_iterator begin() const {
-      return _data;
-    }
-
-    //! Return a CImg<T>::iterator pointing next to the last pixel value.
-    /**
-       \note
-       - Writing \c img.end() is equivalent to <tt>img.data() + img.size()</tt>.
-       - It has been mainly defined for compatibility with STL naming conventions.
-       \warning
-       - The returned iterator actually points to a value located \e outside the acceptable bounds of the pixel buffer.
-         Trying to read or write the content of the returned iterator will probably result in a crash.
-         Use it mainly as a strict upper bound for a CImg<T>::iterator.
-       \par Example
-       \code
-       CImg<float> img(100,100,1,3); // Define a 100x100 RGB color image.
-       // 'img.end()' used below as an upper bound for the iterator.
-       for (CImg<float>::iterator it = img.begin(); it<img.end(); ++it)
-         *it = 0;
-       \endcode
-    **/
-    iterator end() {
-      return _data + size();
-    }
-
-    //! Return a CImg<T>::iterator pointing next to the last pixel value \const.
-    const_iterator end() const {
-      return _data + size();
-    }
-
-    //! Return a reference to the first pixel value.
-    /**
-       \note
-       - Writing \c img.front() is equivalent to <tt>img[0]</tt>, or <tt>img(0,0,0,0)</tt>.
-       - It has been mainly defined for compatibility with STL naming conventions.
-    **/
-    T& front() {
-      return *_data;
-    }
-
-    //! Return a reference to the first pixel value \const.
-    const T& front() const {
-      return *_data;
-    }
-
-    //! Return a reference to the last pixel value.
-    /**
-       \note
-       - Writing \c img.end() is equivalent to <tt>img[img.size() - 1]</tt>, or
-         <tt>img(img.width() - 1,img.height() - 1,img.depth() - 1,img.spectrum() - 1)</tt>.
-       - It has been mainly defined for compatibility with STL naming conventions.
-    **/
-    T& back() {
-      return *(_data + size() - 1);
-    }
-
-    //! Return a reference to the last pixel value \const.
-    const T& back() const {
-      return *(_data + size() - 1);
-    }
-
-    //! Access to a pixel value at a specified offset, using Dirichlet boundary conditions.
-    /**
-       Return a reference to the pixel value of the image instance located at a specified \c offset,
-       or to a specified default value in case of out-of-bounds access.
-       \param offset Offset to the desired pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note
-       - Writing \c img.at(offset,out_value) is similar to <tt>img[offset]</tt>, except that if \c offset
-         is outside bounds (e.g. \c offset<0 or \c offset>=img.size()), a reference to a value \c out_value
-         is safely returned instead.
-       - Due to the additional boundary checking operation, this method is slower than operator()(). Use it when
-         you are \e not sure about the validity of the specified pixel offset.
-    **/
-    T& at(const int offset, const T& out_value) {
-      return (offset<0 || offset>=(int)size())?(cimg::temporary(out_value)=out_value):(*this)[offset];
-    }
-
-    //! Access to a pixel value at a specified offset, using Dirichlet boundary conditions \const.
-    T at(const int offset, const T& out_value) const {
-      return (offset<0 || offset>=(int)size())?out_value:(*this)[offset];
-    }
-
-    //! Access to a pixel value at a specified offset, using Neumann boundary conditions.
-    /**
-       Return a reference to the pixel value of the image instance located at a specified \c offset,
-       or to the nearest pixel location in the image instance in case of out-of-bounds access.
-       \param offset Offset to the desired pixel value.
-       \note
-       - Similar to at(int,const T), except that an out-of-bounds access returns the value of the
-         nearest pixel in the image instance, regarding the specified offset, i.e.
-         - If \c offset<0, then \c img[0] is returned.
-         - If \c offset>=img.size(), then \c img[img.size() - 1] is returned.
-       - Due to the additional boundary checking operation, this method is slower than operator()(). Use it when
-         you are \e not sure about the validity of the specified pixel offset.
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method \c _at(int).
-     **/
-    T& at(const int offset) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "at(): Empty instance.",
-                                    cimg_instance);
-      return _at(offset);
-    }
-
-    T& _at(const int offset) {
-      const unsigned int siz = (unsigned int)size();
-      return (*this)[offset<0?0:(unsigned int)offset>=siz?siz - 1:offset];
-    }
-
-    //! Access to a pixel value at a specified offset, using Neumann boundary conditions \const.
-    const T& at(const int offset) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "at(): Empty instance.",
-                                    cimg_instance);
-      return _at(offset);
-    }
-
-    const T& _at(const int offset) const {
-      const unsigned int siz = (unsigned int)size();
-      return (*this)[offset<0?0:(unsigned int)offset>=siz?siz - 1:offset];
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X-coordinate.
-    /**
-       Return a reference to the pixel value of the image instance located at (\c x,\c y,\c z,\c c),
-       or to a specified default value in case of out-of-bounds access along the X-axis.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c (\c x,\c y,\c z,\c c) is outside image bounds.
-       \note
-       - Similar to operator()(), except that an out-of-bounds access along the X-axis returns the specified value
-         \c out_value.
-       - Due to the additional boundary checking operation, this method is slower than operator()(). Use it when
-         you are \e not sure about the validity of the specified pixel coordinates.
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-    **/
-    T& atX(const int x, const int y, const int z, const int c, const T& out_value) {
-      return (x<0 || x>=width())?(cimg::temporary(out_value)=out_value):(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X-coordinate \const.
-    T atX(const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (x<0 || x>=width())?out_value:(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X-coordinate.
-    /**
-       Return a reference to the pixel value of the image instance located at (\c x,\c y,\c z,\c c),
-       or to the nearest pixel location in the image instance in case of out-of-bounds access along the X-axis.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Similar to at(int,int,int,int,const T), except that an out-of-bounds access returns the value of the
-         nearest pixel in the image instance, regarding the specified X-coordinate.
-       - Due to the additional boundary checking operation, this method is slower than operator()(). Use it when
-         you are \e not sure about the validity of the specified pixel coordinates.
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _at(int,int,int,int).
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-     **/
-    T& atX(const int x, const int y=0, const int z=0, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atX(): Empty instance.",
-                                    cimg_instance);
-      return _atX(x,y,z,c);
-    }
-
-    T& _atX(const int x, const int y=0, const int z=0, const int c=0) {
-      return (*this)(x<0?0:(x>=width()?width() - 1:x),y,z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X-coordinate \const.
-    const T& atX(const int x, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atX(): Empty instance.",
-                                    cimg_instance);
-      return _atX(x,y,z,c);
-    }
-
-    const T& _atX(const int x, const int y=0, const int z=0, const int c=0) const {
-      return (*this)(x<0?0:(x>=width()?width() - 1:x),y,z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to atX(int,int,int,int,const T), except that boundary checking is performed both on X and Y-coordinates.
-    **/
-    T& atXY(const int x, const int y, const int z, const int c, const T& out_value) {
-      return (x<0 || y<0 || x>=width() || y>=height())?(cimg::temporary(out_value)=out_value):(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X and Y coordinates \const.
-    T atXY(const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (x<0 || y<0 || x>=width() || y>=height())?out_value:(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to atX(int,int,int,int), except that boundary checking is performed both on X and Y-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _atXY(int,int,int,int).
-     **/
-    T& atXY(const int x, const int y, const int z=0, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXY(): Empty instance.",
-                                    cimg_instance);
-      return _atXY(x,y,z,c);
-    }
-
-    T& _atXY(const int x, const int y, const int z=0, const int c=0) {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X and Y-coordinates \const.
-    const T& atXY(const int x, const int y, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXY(): Empty instance.",
-                                    cimg_instance);
-      return _atXY(x,y,z,c);
-    }
-
-    const T& _atXY(const int x, const int y, const int z=0, const int c=0) const {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to atX(int,int,int,int,const T), except that boundary checking is performed both on
-       X,Y and Z-coordinates.
-    **/
-    T& atXYZ(const int x, const int y, const int z, const int c, const T& out_value) {
-      return (x<0 || y<0 || z<0 || x>=width() || y>=height() || z>=depth())?
-        (cimg::temporary(out_value)=out_value):(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions for the X,Y and Z-coordinates \const.
-    T atXYZ(const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (x<0 || y<0 || z<0 || x>=width() || y>=height() || z>=depth())?out_value:(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to atX(int,int,int,int), except that boundary checking is performed both on X,Y and Z-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _atXYZ(int,int,int,int).
-    **/
-    T& atXYZ(const int x, const int y, const int z, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXYZ(): Empty instance.",
-                                    cimg_instance);
-      return _atXYZ(x,y,z,c);
-    }
-
-    T& _atXYZ(const int x, const int y, const int z, const int c=0) {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),
-                     cimg::cut(z,0,depth() - 1),c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions for the X,Y and Z-coordinates \const.
-    const T& atXYZ(const int x, const int y, const int z, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXYZ(): Empty instance.",
-                                    cimg_instance);
-      return _atXYZ(x,y,z,c);
-    }
-
-    const T& _atXYZ(const int x, const int y, const int z, const int c=0) const {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),
-                     cimg::cut(z,0,depth() - 1),c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions.
-    /**
-       Similar to atX(int,int,int,int,const T), except that boundary checking is performed on all
-       X,Y,Z and C-coordinates.
-    **/
-    T& atXYZC(const int x, const int y, const int z, const int c, const T& out_value) {
-      return (x<0 || y<0 || z<0 || c<0 || x>=width() || y>=height() || z>=depth() || c>=spectrum())?
-        (cimg::temporary(out_value)=out_value):(*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Dirichlet boundary conditions \const.
-    T atXYZC(const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (x<0 || y<0 || z<0 || c<0 || x>=width() || y>=height() || z>=depth() || c>=spectrum())?out_value:
-        (*this)(x,y,z,c);
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions.
-    /**
-       Similar to atX(int,int,int,int), except that boundary checking is performed on all X,Y,Z and C-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _atXYZC(int,int,int,int).
-    **/
-    T& atXYZC(const int x, const int y, const int z, const int c) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXYZC(): Empty instance.",
-                                    cimg_instance);
-      return _atXYZC(x,y,z,c);
-    }
-
-    T& _atXYZC(const int x, const int y, const int z, const int c) {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),
-                     cimg::cut(z,0,depth() - 1),
-                     cimg::cut(c,0,spectrum() - 1));
-    }
-
-    //! Access to a pixel value, using Neumann boundary conditions \const.
-    const T& atXYZC(const int x, const int y, const int z, const int c) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "atXYZC(): Empty instance.",
-                                    cimg_instance);
-      return _atXYZC(x,y,z,c);
-    }
-
-    const T& _atXYZC(const int x, const int y, const int z, const int c) const {
-      return (*this)(cimg::cut(x,0,width() - 1),
-                     cimg::cut(y,0,height() - 1),
-                     cimg::cut(z,0,depth() - 1),
-                     cimg::cut(c,0,spectrum() - 1));
-    }
-
-    //! Return pixel value, using linear interpolation and Dirichlet boundary conditions for the X-coordinate.
-    /**
-       Return a linearly-interpolated pixel value of the image instance located at (\c fx,\c y,\c z,\c c),
-       or a specified default value in case of out-of-bounds access along the X-axis.
-       \param fx X-coordinate of the pixel value (float-valued).
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c (\c fx,\c y,\c z,\c c) is outside image bounds.
-       \note
-       - Similar to atX(int,int,int,int,const T), except that the returned pixel value is approximated by
-         a linear interpolation along the X-axis, if corresponding coordinates are not integers.
-       - The type of the returned pixel value is extended to \c float, if the pixel type \c T is not float-valued.
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-    **/
-    Tfloat linear_atX(const float fx, const int y, const int z, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1;
-      const float
-        dx = fx - x;
-      const Tfloat
-        Ic = (Tfloat)atX(x,y,z,c,out_value), In = (Tfloat)atXY(nx,y,z,c,out_value);
-      return Ic + dx*(In - Ic);
-    }
-
-    //! Return pixel value, using linear interpolation and Neumann boundary conditions for the X-coordinate.
-    /**
-       Return a linearly-interpolated pixel value of the image instance located at (\c fx,\c y,\c z,\c c),
-       or the value of the nearest pixel location in the image instance in case of out-of-bounds access along
-       the X-axis.
-       \param fx X-coordinate of the pixel value (float-valued).
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Similar to linear_atX(float,int,int,int,const T) const, except that an out-of-bounds access returns
-         the value of the nearest pixel in the image instance, regarding the specified X-coordinate.
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _linear_atX(float,int,int,int).
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-    **/
-    Tfloat linear_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "linear_atX(): Empty instance.",
-                                    cimg_instance);
-
-      return _linear_atX(fx,y,z,c);
-    }
-
-    Tfloat _linear_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1);
-      const unsigned int
-        x = (unsigned int)nfx;
-      const float
-        dx = nfx - x;
-      const unsigned int
-        nx = dx>0?x + 1:x;
-      const Tfloat
-        Ic = (Tfloat)(*this)(x,y,z,c), In = (Tfloat)(*this)(nx,y,z,c);
-      return Ic + dx*(In - Ic);
-    }
-
-    //! Return pixel value, using linear interpolation and Dirichlet boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int,const T) const, except that the linear interpolation and the
-       boundary checking are achieved both for X and Y-coordinates.
-    **/
-    Tfloat linear_atXY(const float fx, const float fy, const int z, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1,
-        y = (int)fy - (fy>=0?0:1), ny = y + 1;
-      const float
-        dx = fx - x,
-        dy = fy - y;
-      const Tfloat
-        Icc = (Tfloat)atXY(x,y,z,c,out_value),  Inc = (Tfloat)atXY(nx,y,z,c,out_value),
-        Icn = (Tfloat)atXY(x,ny,z,c,out_value), Inn = (Tfloat)atXY(nx,ny,z,c,out_value);
-      return Icc + dx*(Inc - Icc + dy*(Icc + Inn - Icn - Inc)) + dy*(Icn - Icc);
-    }
-
-    //! Return pixel value, using linear interpolation and Neumann boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int) const, except that the linear interpolation and the boundary checking
-       are achieved both for X and Y-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _linear_atXY(float,float,int,int).
-    **/
-    Tfloat linear_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "linear_atXY(): Empty instance.",
-                                    cimg_instance);
-
-      return _linear_atXY(fx,fy,z,c);
-    }
-
-    Tfloat _linear_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1),
-        nfy = cimg::cut(fy,0,height() - 1);
-      const unsigned int
-        x = (unsigned int)nfx,
-        y = (unsigned int)nfy;
-      const float
-        dx = nfx - x,
-        dy = nfy - y;
-      const unsigned int
-        nx = dx>0?x + 1:x,
-        ny = dy>0?y + 1:y;
-      const Tfloat
-        Icc = (Tfloat)(*this)(x,y,z,c),  Inc = (Tfloat)(*this)(nx,y,z,c),
-        Icn = (Tfloat)(*this)(x,ny,z,c), Inn = (Tfloat)(*this)(nx,ny,z,c);
-      return Icc + dx*(Inc - Icc + dy*(Icc + Inn - Icn - Inc)) + dy*(Icn - Icc);
-    }
-
-    //! Return pixel value, using linear interpolation and Dirichlet boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int,const T) const, except that the linear interpolation and the
-       boundary checking are achieved both for X,Y and Z-coordinates.
-    **/
-    Tfloat linear_atXYZ(const float fx, const float fy, const float fz, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1,
-        y = (int)fy - (fy>=0?0:1), ny = y + 1,
-        z = (int)fz - (fz>=0?0:1), nz = z + 1;
-      const float
-        dx = fx - x,
-        dy = fy - y,
-        dz = fz - z;
-      const Tfloat
-        Iccc = (Tfloat)atXYZ(x,y,z,c,out_value), Incc = (Tfloat)atXYZ(nx,y,z,c,out_value),
-        Icnc = (Tfloat)atXYZ(x,ny,z,c,out_value), Innc = (Tfloat)atXYZ(nx,ny,z,c,out_value),
-        Iccn = (Tfloat)atXYZ(x,y,nz,c,out_value), Incn = (Tfloat)atXYZ(nx,y,nz,c,out_value),
-        Icnn = (Tfloat)atXYZ(x,ny,nz,c,out_value), Innn = (Tfloat)atXYZ(nx,ny,nz,c,out_value);
-      return Iccc +
-        dx*(Incc - Iccc +
-            dy*(Iccc + Innc - Icnc - Incc +
-                dz*(Iccn + Innn + Icnc + Incc - Icnn - Incn - Iccc - Innc)) +
-            dz*(Iccc + Incn - Iccn - Incc)) +
-        dy*(Icnc - Iccc +
-            dz*(Iccc + Icnn - Iccn - Icnc)) +
-        dz*(Iccn - Iccc);
-    }
-
-    //! Return pixel value, using linear interpolation and Neumann boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int) const, except that the linear interpolation and the boundary checking
-       are achieved both for X,Y and Z-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _linear_atXYZ(float,float,float,int).
-    **/
-    Tfloat linear_atXYZ(const float fx, const float fy=0, const float fz=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "linear_atXYZ(): Empty instance.",
-                                    cimg_instance);
-
-      return _linear_atXYZ(fx,fy,fz,c);
-    }
-
-    Tfloat _linear_atXYZ(const float fx, const float fy=0, const float fz=0, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1),
-        nfy = cimg::cut(fy,0,height() - 1),
-        nfz = cimg::cut(fz,0,depth() - 1);
-      const unsigned int
-        x = (unsigned int)nfx,
-        y = (unsigned int)nfy,
-        z = (unsigned int)nfz;
-      const float
-        dx = nfx - x,
-        dy = nfy - y,
-        dz = nfz - z;
-      const unsigned int
-        nx = dx>0?x + 1:x,
-        ny = dy>0?y + 1:y,
-        nz = dz>0?z + 1:z;
-      const Tfloat
-        Iccc = (Tfloat)(*this)(x,y,z,c), Incc = (Tfloat)(*this)(nx,y,z,c),
-        Icnc = (Tfloat)(*this)(x,ny,z,c), Innc = (Tfloat)(*this)(nx,ny,z,c),
-        Iccn = (Tfloat)(*this)(x,y,nz,c), Incn = (Tfloat)(*this)(nx,y,nz,c),
-        Icnn = (Tfloat)(*this)(x,ny,nz,c), Innn = (Tfloat)(*this)(nx,ny,nz,c);
-      return Iccc +
-        dx*(Incc - Iccc +
-            dy*(Iccc + Innc - Icnc - Incc +
-                dz*(Iccn + Innn + Icnc + Incc - Icnn - Incn - Iccc - Innc)) +
-            dz*(Iccc + Incn - Iccn - Incc)) +
-        dy*(Icnc - Iccc +
-            dz*(Iccc + Icnn - Iccn - Icnc)) +
-        dz*(Iccn - Iccc);
-    }
-
-    //! Return pixel value, using linear interpolation and Dirichlet boundary conditions for all X,Y,Z,C-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int,const T) const, except that the linear interpolation and the
-       boundary checking are achieved for all X,Y,Z and C-coordinates.
-    **/
-    Tfloat linear_atXYZC(const float fx, const float fy, const float fz, const float fc, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1,
-        y = (int)fy - (fy>=0?0:1), ny = y + 1,
-        z = (int)fz - (fz>=0?0:1), nz = z + 1,
-        c = (int)fc - (fc>=0?0:1), nc = c + 1;
-      const float
-        dx = fx - x,
-        dy = fy - y,
-        dz = fz - z,
-        dc = fc - c;
-      const Tfloat
-        Icccc = (Tfloat)atXYZC(x,y,z,c,out_value), Inccc = (Tfloat)atXYZC(nx,y,z,c,out_value),
-        Icncc = (Tfloat)atXYZC(x,ny,z,c,out_value), Inncc = (Tfloat)atXYZC(nx,ny,z,c,out_value),
-        Iccnc = (Tfloat)atXYZC(x,y,nz,c,out_value), Incnc = (Tfloat)atXYZC(nx,y,nz,c,out_value),
-        Icnnc = (Tfloat)atXYZC(x,ny,nz,c,out_value), Innnc = (Tfloat)atXYZC(nx,ny,nz,c,out_value),
-        Icccn = (Tfloat)atXYZC(x,y,z,nc,out_value), Inccn = (Tfloat)atXYZC(nx,y,z,nc,out_value),
-        Icncn = (Tfloat)atXYZC(x,ny,z,nc,out_value), Inncn = (Tfloat)atXYZC(nx,ny,z,nc,out_value),
-        Iccnn = (Tfloat)atXYZC(x,y,nz,nc,out_value), Incnn = (Tfloat)atXYZC(nx,y,nz,nc,out_value),
-        Icnnn = (Tfloat)atXYZC(x,ny,nz,nc,out_value), Innnn = (Tfloat)atXYZC(nx,ny,nz,nc,out_value);
-      return Icccc +
-        dx*(Inccc - Icccc +
-            dy*(Icccc + Inncc - Icncc - Inccc +
-                dz*(Iccnc + Innnc + Icncc + Inccc - Icnnc - Incnc - Icccc - Inncc +
-                    dc*(Iccnn + Innnn + Icncn + Inccn + Icnnc + Incnc + Icccc + Inncc -
-                        Icnnn - Incnn - Icccn - Inncn - Iccnc - Innnc - Icncc - Inccc)) +
-                dc*(Icccn + Inncn + Icncc + Inccc - Icncn - Inccn - Icccc - Inncc)) +
-            dz*(Icccc + Incnc - Iccnc - Inccc +
-                dc*(Icccn + Incnn + Iccnc + Inccc - Iccnn - Inccn - Icccc - Incnc)) +
-            dc*(Icccc + Inccn - Inccc - Icccn)) +
-        dy*(Icncc - Icccc +
-            dz*(Icccc + Icnnc - Iccnc - Icncc +
-                dc*(Icccn + Icnnn + Iccnc + Icncc - Iccnn - Icncn - Icccc - Icnnc)) +
-            dc*(Icccc + Icncn - Icncc - Icccn)) +
-        dz*(Iccnc - Icccc +
-            dc*(Icccc + Iccnn - Iccnc - Icccn)) +
-        dc*(Icccn  -Icccc);
-    }
-
-    //! Return pixel value, using linear interpolation and Neumann boundary conditions for all X,Y,Z and C-coordinates.
-    /**
-       Similar to linear_atX(float,int,int,int) const, except that the linear interpolation and the boundary checking
-       are achieved for all X,Y,Z and C-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _linear_atXYZC(float,float,float,float).
-    **/
-    Tfloat linear_atXYZC(const float fx, const float fy=0, const float fz=0, const float fc=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "linear_atXYZC(): Empty instance.",
-                                    cimg_instance);
-
-      return _linear_atXYZC(fx,fy,fz,fc);
-    }
-
-    Tfloat _linear_atXYZC(const float fx, const float fy=0, const float fz=0, const float fc=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1),
-        nfy = cimg::cut(fy,0,height() - 1),
-        nfz = cimg::cut(fz,0,depth() - 1),
-        nfc = cimg::cut(fc,0,spectrum() - 1);
-      const unsigned int
-        x = (unsigned int)nfx,
-        y = (unsigned int)nfy,
-        z = (unsigned int)nfz,
-        c = (unsigned int)nfc;
-      const float
-        dx = nfx - x,
-        dy = nfy - y,
-        dz = nfz - z,
-        dc = nfc - c;
-      const unsigned int
-        nx = dx>0?x + 1:x,
-        ny = dy>0?y + 1:y,
-        nz = dz>0?z + 1:z,
-        nc = dc>0?c + 1:c;
-      const Tfloat
-        Icccc = (Tfloat)(*this)(x,y,z,c), Inccc = (Tfloat)(*this)(nx,y,z,c),
-        Icncc = (Tfloat)(*this)(x,ny,z,c), Inncc = (Tfloat)(*this)(nx,ny,z,c),
-        Iccnc = (Tfloat)(*this)(x,y,nz,c), Incnc = (Tfloat)(*this)(nx,y,nz,c),
-        Icnnc = (Tfloat)(*this)(x,ny,nz,c), Innnc = (Tfloat)(*this)(nx,ny,nz,c),
-        Icccn = (Tfloat)(*this)(x,y,z,nc), Inccn = (Tfloat)(*this)(nx,y,z,nc),
-        Icncn = (Tfloat)(*this)(x,ny,z,nc), Inncn = (Tfloat)(*this)(nx,ny,z,nc),
-        Iccnn = (Tfloat)(*this)(x,y,nz,nc), Incnn = (Tfloat)(*this)(nx,y,nz,nc),
-        Icnnn = (Tfloat)(*this)(x,ny,nz,nc), Innnn = (Tfloat)(*this)(nx,ny,nz,nc);
-      return Icccc +
-        dx*(Inccc - Icccc +
-            dy*(Icccc + Inncc - Icncc - Inccc +
-                dz*(Iccnc + Innnc + Icncc + Inccc - Icnnc - Incnc - Icccc - Inncc +
-                    dc*(Iccnn + Innnn + Icncn + Inccn + Icnnc + Incnc + Icccc + Inncc -
-                        Icnnn - Incnn - Icccn - Inncn - Iccnc - Innnc - Icncc - Inccc)) +
-                dc*(Icccn + Inncn + Icncc + Inccc - Icncn - Inccn - Icccc - Inncc)) +
-            dz*(Icccc + Incnc - Iccnc - Inccc +
-                dc*(Icccn + Incnn + Iccnc + Inccc - Iccnn - Inccn - Icccc - Incnc)) +
-            dc*(Icccc + Inccn - Inccc - Icccn)) +
-        dy*(Icncc - Icccc +
-            dz*(Icccc + Icnnc - Iccnc - Icncc +
-                dc*(Icccn + Icnnn + Iccnc + Icncc - Iccnn - Icncn - Icccc - Icnnc)) +
-            dc*(Icccc + Icncn - Icncc - Icccn)) +
-        dz*(Iccnc - Icccc +
-            dc*(Icccc + Iccnn - Iccnc - Icccn)) +
-        dc*(Icccn - Icccc);
-    }
-
-    //! Return pixel value, using cubic interpolation and Dirichlet boundary conditions for the X-coordinate.
-    /**
-       Return a cubicly-interpolated pixel value of the image instance located at (\c fx,\c y,\c z,\c c),
-       or a specified default value in case of out-of-bounds access along the X-axis.
-       The cubic interpolation uses Hermite splines.
-       \param fx d X-coordinate of the pixel value (float-valued).
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c (\c fx,\c y,\c z,\c c) is outside image bounds.
-       \note
-       - Similar to linear_atX(float,int,int,int,const T) const, except that the returned pixel value is
-         approximated by a \e cubic interpolation along the X-axis.
-       - The type of the returned pixel value is extended to \c float, if the pixel type \c T is not float-valued.
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-    **/
-    Tfloat cubic_atX(const float fx, const int y, const int z, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2;
-      const float
-        dx = fx - x;
-      const Tfloat
-        Ip = (Tfloat)atX(px,y,z,c,out_value), Ic = (Tfloat)atX(x,y,z,c,out_value),
-        In = (Tfloat)atX(nx,y,z,c,out_value), Ia = (Tfloat)atX(ax,y,z,c,out_value);
-      return Ic + 0.5f*(dx*(-Ip + In) + dx*dx*(2*Ip - 5*Ic + 4*In - Ia) + dx*dx*dx*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Dirichlet boundary conditions for the X-coordinate.
-    /**
-       Similar to cubic_atX(float,int,int,int,const T) const, except that you can specify the authorized minimum
-       and maximum of the returned value.
-    **/
-    Tfloat cubic_atX(const float fx, const int y, const int z, const int c, const T& out_value,
-                     const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atX(fx,y,z,c,out_value);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Return pixel value, using cubic interpolation and Neumann boundary conditions for the X-coordinate.
-    /**
-       Return a cubicly-interpolated pixel value of the image instance located at (\c fx,\c y,\c z,\c c),
-       or the value of the nearest pixel location in the image instance in case of out-of-bounds access
-       along the X-axis. The cubic interpolation uses Hermite splines.
-       \param fx X-coordinate of the pixel value (float-valued).
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Similar to cubic_atX(float,int,int,int,const T) const, except that the returned pixel value is
-         approximated by a cubic interpolation along the X-axis.
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _cubic_atX(float,int,int,int).
-       \warning
-       - There is \e no boundary checking performed for the Y,Z and C-coordinates, so they must be inside image bounds.
-    **/
-    Tfloat cubic_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "cubic_atX(): Empty instance.",
-                                    cimg_instance);
-      return _cubic_atX(fx,y,z,c);
-    }
-
-    Tfloat _cubic_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1);
-      const int
-        x = (int)nfx;
-      const float
-        dx = nfx - x;
-      const int
-        px = x - 1<0?0:x - 1, nx = dx>0?x + 1:x, ax = x + 2>=width()?width() - 1:x + 2;
-      const Tfloat
-        Ip = (Tfloat)(*this)(px,y,z,c), Ic = (Tfloat)(*this)(x,y,z,c),
-        In = (Tfloat)(*this)(nx,y,z,c), Ia = (Tfloat)(*this)(ax,y,z,c);
-      return Ic + 0.5f*(dx*(-Ip + In) + dx*dx*(2*Ip - 5*Ic + 4*In - Ia) + dx*dx*dx*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Neumann boundary conditions for the X-coordinate.
-    /**
-       Similar to cubic_atX(float,int,int,int) const, except that you can specify the authorized minimum and maximum
-       of the returned value.
-    **/
-    Tfloat cubic_atX(const float fx, const int y, const int z, const int c,
-                     const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atX(fx,y,z,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    Tfloat _cubic_atX(const float fx, const int y, const int z, const int c,
-                      const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = _cubic_atX(fx,y,z,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Return pixel value, using cubic interpolation and Dirichlet boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to cubic_atX(float,int,int,int,const T) const, except that the cubic interpolation and boundary checking
-       are achieved both for X and Y-coordinates.
-    **/
-    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2,
-        y = (int)fy - (fy>=0?0:1), py = y - 1, ny = y + 1, ay = y + 2;
-      const float dx = fx - x, dy = fy - y;
-      const Tfloat
-        Ipp = (Tfloat)atXY(px,py,z,c,out_value), Icp = (Tfloat)atXY(x,py,z,c,out_value),
-        Inp = (Tfloat)atXY(nx,py,z,c,out_value), Iap = (Tfloat)atXY(ax,py,z,c,out_value),
-        Ip = Icp + 0.5f*(dx*(-Ipp + Inp) + dx*dx*(2*Ipp - 5*Icp + 4*Inp - Iap) + dx*dx*dx*(-Ipp + 3*Icp - 3*Inp + Iap)),
-        Ipc = (Tfloat)atXY(px,y,z,c,out_value),  Icc = (Tfloat)atXY(x, y,z,c,out_value),
-        Inc = (Tfloat)atXY(nx,y,z,c,out_value),  Iac = (Tfloat)atXY(ax,y,z,c,out_value),
-        Ic = Icc + 0.5f*(dx*(-Ipc + Inc) + dx*dx*(2*Ipc - 5*Icc + 4*Inc - Iac) + dx*dx*dx*(-Ipc + 3*Icc - 3*Inc + Iac)),
-        Ipn = (Tfloat)atXY(px,ny,z,c,out_value), Icn = (Tfloat)atXY(x,ny,z,c,out_value),
-        Inn = (Tfloat)atXY(nx,ny,z,c,out_value), Ian = (Tfloat)atXY(ax,ny,z,c,out_value),
-        In = Icn + 0.5f*(dx*(-Ipn + Inn) + dx*dx*(2*Ipn - 5*Icn + 4*Inn - Ian) + dx*dx*dx*(-Ipn + 3*Icn - 3*Inn + Ian)),
-        Ipa = (Tfloat)atXY(px,ay,z,c,out_value), Ica = (Tfloat)atXY(x,ay,z,c,out_value),
-        Ina = (Tfloat)atXY(nx,ay,z,c,out_value), Iaa = (Tfloat)atXY(ax,ay,z,c,out_value),
-        Ia = Ica + 0.5f*(dx*(-Ipa + Ina) + dx*dx*(2*Ipa - 5*Ica + 4*Ina - Iaa) + dx*dx*dx*(-Ipa + 3*Ica - 3*Ina + Iaa));
-      return Ic + 0.5f*(dy*(-Ip + In) + dy*dy*(2*Ip - 5*Ic + 4*In - Ia) + dy*dy*dy*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Dirichlet boundary conditions for the X,Y-coordinates.
-    /**
-       Similar to cubic_atXY(float,float,int,int,const T) const, except that you can specify the authorized
-       minimum and maximum of the returned value.
-    **/
-    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c, const T& out_value,
-                      const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atXY(fx,fy,z,c,out_value);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Return pixel value, using cubic interpolation and Neumann boundary conditions for the X and Y-coordinates.
-    /**
-       Similar to cubic_atX(float,int,int,int) const, except that the cubic interpolation and boundary checking
-       are achieved for both X and Y-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-       \c _cubic_atXY(float,float,int,int).
-    **/
-    Tfloat cubic_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "cubic_atXY(): Empty instance.",
-                                    cimg_instance);
-      return _cubic_atXY(fx,fy,z,c);
-    }
-
-    Tfloat _cubic_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1),
-        nfy = cimg::cut(fy,0,height() - 1);
-      const int x = (int)nfx, y = (int)nfy;
-      const float dx = nfx - x, dy = nfy - y;
-      const int
-        px = x - 1<0?0:x - 1, nx = dx>0?x + 1:x, ax = x + 2>=width()?width() - 1:x + 2,
-        py = y - 1<0?0:y - 1, ny = dy>0?y + 1:y, ay = y + 2>=height()?height() - 1:y + 2;
-      const Tfloat
-        Ipp = (Tfloat)(*this)(px,py,z,c), Icp = (Tfloat)(*this)(x,py,z,c), Inp = (Tfloat)(*this)(nx,py,z,c),
-        Iap = (Tfloat)(*this)(ax,py,z,c),
-        Ip = Icp + 0.5f*(dx*(-Ipp + Inp) + dx*dx*(2*Ipp - 5*Icp + 4*Inp - Iap) + dx*dx*dx*(-Ipp + 3*Icp - 3*Inp + Iap)),
-        Ipc = (Tfloat)(*this)(px,y,z,c),  Icc = (Tfloat)(*this)(x, y,z,c), Inc = (Tfloat)(*this)(nx,y,z,c),
-        Iac = (Tfloat)(*this)(ax,y,z,c),
-        Ic = Icc + 0.5f*(dx*(-Ipc + Inc) + dx*dx*(2*Ipc - 5*Icc + 4*Inc - Iac) + dx*dx*dx*(-Ipc + 3*Icc - 3*Inc + Iac)),
-        Ipn = (Tfloat)(*this)(px,ny,z,c), Icn = (Tfloat)(*this)(x,ny,z,c), Inn = (Tfloat)(*this)(nx,ny,z,c),
-        Ian = (Tfloat)(*this)(ax,ny,z,c),
-        In = Icn + 0.5f*(dx*(-Ipn + Inn) + dx*dx*(2*Ipn - 5*Icn + 4*Inn - Ian) + dx*dx*dx*(-Ipn + 3*Icn - 3*Inn + Ian)),
-        Ipa = (Tfloat)(*this)(px,ay,z,c), Ica = (Tfloat)(*this)(x,ay,z,c), Ina = (Tfloat)(*this)(nx,ay,z,c),
-        Iaa = (Tfloat)(*this)(ax,ay,z,c),
-        Ia = Ica + 0.5f*(dx*(-Ipa + Ina) + dx*dx*(2*Ipa - 5*Ica + 4*Ina - Iaa) + dx*dx*dx*(-Ipa + 3*Ica - 3*Ina + Iaa));
-      return Ic + 0.5f*(dy*(-Ip + In) + dy*dy*(2*Ip - 5*Ic + 4*In - Ia) + dy*dy*dy*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Neumann boundary conditions for the X,Y-coordinates.
-    /**
-       Similar to cubic_atXY(float,float,int,int) const, except that you can specify the authorized minimum and
-       maximum of the returned value.
-    **/
-    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c,
-                      const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atXY(fx,fy,z,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    Tfloat _cubic_atXY(const float fx, const float fy, const int z, const int c,
-                       const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = _cubic_atXY(fx,fy,z,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Return pixel value, using cubic interpolation and Dirichlet boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to cubic_atX(float,int,int,int,const T) const, except that the cubic interpolation and boundary checking
-       are achieved both for X,Y and Z-coordinates.
-    **/
-    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c, const T& out_value) const {
-      const int
-        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2,
-        y = (int)fy - (fy>=0?0:1), py = y - 1, ny = y + 1, ay = y + 2,
-        z = (int)fz - (fz>=0?0:1), pz = z - 1, nz = z + 1, az = z + 2;
-      const float dx = fx - x, dy = fy - y, dz = fz - z;
-      const Tfloat
-        Ippp = (Tfloat)atXYZ(px,py,pz,c,out_value), Icpp = (Tfloat)atXYZ(x,py,pz,c,out_value),
-        Inpp = (Tfloat)atXYZ(nx,py,pz,c,out_value), Iapp = (Tfloat)atXYZ(ax,py,pz,c,out_value),
-        Ipp = Icpp + 0.5f*(dx*(-Ippp + Inpp) + dx*dx*(2*Ippp - 5*Icpp + 4*Inpp - Iapp) +
-                           dx*dx*dx*(-Ippp + 3*Icpp - 3*Inpp + Iapp)),
-        Ipcp = (Tfloat)atXYZ(px,y,pz,c,out_value),  Iccp = (Tfloat)atXYZ(x, y,pz,c,out_value),
-        Incp = (Tfloat)atXYZ(nx,y,pz,c,out_value),  Iacp = (Tfloat)atXYZ(ax,y,pz,c,out_value),
-        Icp = Iccp + 0.5f*(dx*(-Ipcp + Incp) + dx*dx*(2*Ipcp - 5*Iccp + 4*Incp - Iacp) +
-                           dx*dx*dx*(-Ipcp + 3*Iccp - 3*Incp + Iacp)),
-        Ipnp = (Tfloat)atXYZ(px,ny,pz,c,out_value), Icnp = (Tfloat)atXYZ(x,ny,pz,c,out_value),
-        Innp = (Tfloat)atXYZ(nx,ny,pz,c,out_value), Ianp = (Tfloat)atXYZ(ax,ny,pz,c,out_value),
-        Inp = Icnp + 0.5f*(dx*(-Ipnp + Innp) + dx*dx*(2*Ipnp - 5*Icnp + 4*Innp - Ianp) +
-                           dx*dx*dx*(-Ipnp + 3*Icnp - 3*Innp + Ianp)),
-        Ipap = (Tfloat)atXYZ(px,ay,pz,c,out_value), Icap = (Tfloat)atXYZ(x,ay,pz,c,out_value),
-        Inap = (Tfloat)atXYZ(nx,ay,pz,c,out_value), Iaap = (Tfloat)atXYZ(ax,ay,pz,c,out_value),
-        Iap = Icap + 0.5f*(dx*(-Ipap + Inap) + dx*dx*(2*Ipap - 5*Icap + 4*Inap - Iaap) +
-                           dx*dx*dx*(-Ipap + 3*Icap - 3*Inap + Iaap)),
-        Ip = Icp + 0.5f*(dy*(-Ipp + Inp) + dy*dy*(2*Ipp - 5*Icp + 4*Inp - Iap) +
-                         dy*dy*dy*(-Ipp + 3*Icp - 3*Inp + Iap)),
-        Ippc = (Tfloat)atXYZ(px,py,z,c,out_value), Icpc = (Tfloat)atXYZ(x,py,z,c,out_value),
-        Inpc = (Tfloat)atXYZ(nx,py,z,c,out_value), Iapc = (Tfloat)atXYZ(ax,py,z,c,out_value),
-        Ipc = Icpc + 0.5f*(dx*(-Ippc + Inpc) + dx*dx*(2*Ippc - 5*Icpc + 4*Inpc - Iapc) +
-                           dx*dx*dx*(-Ippc + 3*Icpc - 3*Inpc + Iapc)),
-        Ipcc = (Tfloat)atXYZ(px,y,z,c,out_value),  Iccc = (Tfloat)atXYZ(x, y,z,c,out_value),
-        Incc = (Tfloat)atXYZ(nx,y,z,c,out_value),  Iacc = (Tfloat)atXYZ(ax,y,z,c,out_value),
-        Icc = Iccc + 0.5f*(dx*(-Ipcc + Incc) + dx*dx*(2*Ipcc - 5*Iccc + 4*Incc - Iacc) +
-                           dx*dx*dx*(-Ipcc + 3*Iccc - 3*Incc + Iacc)),
-        Ipnc = (Tfloat)atXYZ(px,ny,z,c,out_value), Icnc = (Tfloat)atXYZ(x,ny,z,c,out_value),
-        Innc = (Tfloat)atXYZ(nx,ny,z,c,out_value), Ianc = (Tfloat)atXYZ(ax,ny,z,c,out_value),
-        Inc = Icnc + 0.5f*(dx*(-Ipnc + Innc) + dx*dx*(2*Ipnc - 5*Icnc + 4*Innc - Ianc) +
-                           dx*dx*dx*(-Ipnc + 3*Icnc - 3*Innc + Ianc)),
-        Ipac = (Tfloat)atXYZ(px,ay,z,c,out_value), Icac = (Tfloat)atXYZ(x,ay,z,c,out_value),
-        Inac = (Tfloat)atXYZ(nx,ay,z,c,out_value), Iaac = (Tfloat)atXYZ(ax,ay,z,c,out_value),
-        Iac = Icac + 0.5f*(dx*(-Ipac + Inac) + dx*dx*(2*Ipac - 5*Icac + 4*Inac - Iaac) +
-                           dx*dx*dx*(-Ipac + 3*Icac - 3*Inac + Iaac)),
-        Ic = Icc + 0.5f*(dy*(-Ipc + Inc) + dy*dy*(2*Ipc - 5*Icc + 4*Inc - Iac) +
-                         dy*dy*dy*(-Ipc + 3*Icc - 3*Inc + Iac)),
-        Ippn = (Tfloat)atXYZ(px,py,nz,c,out_value), Icpn = (Tfloat)atXYZ(x,py,nz,c,out_value),
-        Inpn = (Tfloat)atXYZ(nx,py,nz,c,out_value), Iapn = (Tfloat)atXYZ(ax,py,nz,c,out_value),
-        Ipn = Icpn + 0.5f*(dx*(-Ippn + Inpn) + dx*dx*(2*Ippn - 5*Icpn + 4*Inpn - Iapn) +
-                           dx*dx*dx*(-Ippn + 3*Icpn - 3*Inpn + Iapn)),
-        Ipcn = (Tfloat)atXYZ(px,y,nz,c,out_value),  Iccn = (Tfloat)atXYZ(x, y,nz,c,out_value),
-        Incn = (Tfloat)atXYZ(nx,y,nz,c,out_value),  Iacn = (Tfloat)atXYZ(ax,y,nz,c,out_value),
-        Icn = Iccn + 0.5f*(dx*(-Ipcn + Incn) + dx*dx*(2*Ipcn - 5*Iccn + 4*Incn - Iacn) +
-                           dx*dx*dx*(-Ipcn + 3*Iccn - 3*Incn + Iacn)),
-        Ipnn = (Tfloat)atXYZ(px,ny,nz,c,out_value), Icnn = (Tfloat)atXYZ(x,ny,nz,c,out_value),
-        Innn = (Tfloat)atXYZ(nx,ny,nz,c,out_value), Iann = (Tfloat)atXYZ(ax,ny,nz,c,out_value),
-        Inn = Icnn + 0.5f*(dx*(-Ipnn + Innn) + dx*dx*(2*Ipnn - 5*Icnn + 4*Innn - Iann) +
-                           dx*dx*dx*(-Ipnn + 3*Icnn - 3*Innn + Iann)),
-        Ipan = (Tfloat)atXYZ(px,ay,nz,c,out_value), Ican = (Tfloat)atXYZ(x,ay,nz,c,out_value),
-        Inan = (Tfloat)atXYZ(nx,ay,nz,c,out_value), Iaan = (Tfloat)atXYZ(ax,ay,nz,c,out_value),
-        Ian = Ican + 0.5f*(dx*(-Ipan + Inan) + dx*dx*(2*Ipan - 5*Ican + 4*Inan - Iaan) +
-                           dx*dx*dx*(-Ipan + 3*Ican - 3*Inan + Iaan)),
-        In = Icn + 0.5f*(dy*(-Ipn + Inn) + dy*dy*(2*Ipn - 5*Icn + 4*Inn - Ian) +
-                         dy*dy*dy*(-Ipn + 3*Icn - 3*Inn + Ian)),
-        Ippa = (Tfloat)atXYZ(px,py,az,c,out_value), Icpa = (Tfloat)atXYZ(x,py,az,c,out_value),
-        Inpa = (Tfloat)atXYZ(nx,py,az,c,out_value), Iapa = (Tfloat)atXYZ(ax,py,az,c,out_value),
-        Ipa = Icpa + 0.5f*(dx*(-Ippa + Inpa) + dx*dx*(2*Ippa - 5*Icpa + 4*Inpa - Iapa) +
-                           dx*dx*dx*(-Ippa + 3*Icpa - 3*Inpa + Iapa)),
-        Ipca = (Tfloat)atXYZ(px,y,az,c,out_value),  Icca = (Tfloat)atXYZ(x, y,az,c,out_value),
-        Inca = (Tfloat)atXYZ(nx,y,az,c,out_value),  Iaca = (Tfloat)atXYZ(ax,y,az,c,out_value),
-        Ica = Icca + 0.5f*(dx*(-Ipca + Inca) + dx*dx*(2*Ipca - 5*Icca + 4*Inca - Iaca) +
-                           dx*dx*dx*(-Ipca + 3*Icca - 3*Inca + Iaca)),
-        Ipna = (Tfloat)atXYZ(px,ny,az,c,out_value), Icna = (Tfloat)atXYZ(x,ny,az,c,out_value),
-        Inna = (Tfloat)atXYZ(nx,ny,az,c,out_value), Iana = (Tfloat)atXYZ(ax,ny,az,c,out_value),
-        Ina = Icna + 0.5f*(dx*(-Ipna + Inna) + dx*dx*(2*Ipna - 5*Icna + 4*Inna - Iana) +
-                           dx*dx*dx*(-Ipna + 3*Icna - 3*Inna + Iana)),
-        Ipaa = (Tfloat)atXYZ(px,ay,az,c,out_value), Icaa = (Tfloat)atXYZ(x,ay,az,c,out_value),
-        Inaa = (Tfloat)atXYZ(nx,ay,az,c,out_value), Iaaa = (Tfloat)atXYZ(ax,ay,az,c,out_value),
-        Iaa = Icaa + 0.5f*(dx*(-Ipaa + Inaa) + dx*dx*(2*Ipaa - 5*Icaa + 4*Inaa - Iaaa) +
-                           dx*dx*dx*(-Ipaa + 3*Icaa - 3*Inaa + Iaaa)),
-        Ia = Ica + 0.5f*(dy*(-Ipa + Ina) + dy*dy*(2*Ipa - 5*Ica + 4*Ina - Iaa) +
-                         dy*dy*dy*(-Ipa + 3*Ica - 3*Ina + Iaa));
-      return Ic + 0.5f*(dz*(-Ip + In) + dz*dz*(2*Ip - 5*Ic + 4*In - Ia) + dz*dz*dz*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Dirichlet boundary conditions for the XYZ-coordinates.
-    /**
-       Similar to cubic_atXYZ(float,float,float,int,const T) const, except that you can specify the authorized
-       minimum and maximum of the returned value.
-    **/
-    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c, const T& out_value,
-                       const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atXYZ(fx,fy,fz,c,out_value);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Return pixel value, using cubic interpolation and Neumann boundary conditions for the X,Y and Z-coordinates.
-    /**
-       Similar to cubic_atX(float,int,int,int) const, except that the cubic interpolation and boundary checking
-       are achieved both for X,Y and Z-coordinates.
-       \note
-       - If you know your image instance is \e not empty, you may rather use the slightly faster method
-         \c _cubic_atXYZ(float,float,float,int).
-    **/
-    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "cubic_atXYZ(): Empty instance.",
-                                    cimg_instance);
-      return _cubic_atXYZ(fx,fy,fz,c);
-    }
-
-    Tfloat _cubic_atXYZ(const float fx, const float fy, const float fz, const int c=0) const {
-      const float
-        nfx = cimg::cut(fx,0,width() - 1),
-        nfy = cimg::cut(fy,0,height() - 1),
-        nfz = cimg::cut(fz,0,depth() - 1);
-      const int x = (int)nfx, y = (int)nfy, z = (int)nfz;
-      const float dx = nfx - x, dy = nfy - y, dz = nfz - z;
-      const int
-        px = x - 1<0?0:x - 1, nx = dx>0?x + 1:x, ax = x + 2>=width()?width() - 1:x + 2,
-        py = y - 1<0?0:y - 1, ny = dy>0?y + 1:y, ay = y + 2>=height()?height() - 1:y + 2,
-        pz = z - 1<0?0:z - 1, nz = dz>0?z + 1:z, az = z + 2>=depth()?depth() - 1:z + 2;
-      const Tfloat
-        Ippp = (Tfloat)(*this)(px,py,pz,c), Icpp = (Tfloat)(*this)(x,py,pz,c),
-        Inpp = (Tfloat)(*this)(nx,py,pz,c), Iapp = (Tfloat)(*this)(ax,py,pz,c),
-        Ipp = Icpp + 0.5f*(dx*(-Ippp + Inpp) + dx*dx*(2*Ippp - 5*Icpp + 4*Inpp - Iapp) +
-                           dx*dx*dx*(-Ippp + 3*Icpp - 3*Inpp + Iapp)),
-        Ipcp = (Tfloat)(*this)(px,y,pz,c),  Iccp = (Tfloat)(*this)(x, y,pz,c),
-        Incp = (Tfloat)(*this)(nx,y,pz,c),  Iacp = (Tfloat)(*this)(ax,y,pz,c),
-        Icp = Iccp + 0.5f*(dx*(-Ipcp + Incp) + dx*dx*(2*Ipcp - 5*Iccp + 4*Incp - Iacp) +
-                           dx*dx*dx*(-Ipcp + 3*Iccp - 3*Incp + Iacp)),
-        Ipnp = (Tfloat)(*this)(px,ny,pz,c), Icnp = (Tfloat)(*this)(x,ny,pz,c),
-        Innp = (Tfloat)(*this)(nx,ny,pz,c), Ianp = (Tfloat)(*this)(ax,ny,pz,c),
-        Inp = Icnp + 0.5f*(dx*(-Ipnp + Innp) + dx*dx*(2*Ipnp - 5*Icnp + 4*Innp - Ianp) +
-                           dx*dx*dx*(-Ipnp + 3*Icnp - 3*Innp + Ianp)),
-        Ipap = (Tfloat)(*this)(px,ay,pz,c), Icap = (Tfloat)(*this)(x,ay,pz,c),
-        Inap = (Tfloat)(*this)(nx,ay,pz,c), Iaap = (Tfloat)(*this)(ax,ay,pz,c),
-        Iap = Icap + 0.5f*(dx*(-Ipap + Inap) + dx*dx*(2*Ipap - 5*Icap + 4*Inap - Iaap) +
-                           dx*dx*dx*(-Ipap + 3*Icap - 3*Inap + Iaap)),
-        Ip = Icp + 0.5f*(dy*(-Ipp + Inp) + dy*dy*(2*Ipp - 5*Icp + 4*Inp - Iap) +
-                         dy*dy*dy*(-Ipp + 3*Icp - 3*Inp + Iap)),
-        Ippc = (Tfloat)(*this)(px,py,z,c), Icpc = (Tfloat)(*this)(x,py,z,c),
-        Inpc = (Tfloat)(*this)(nx,py,z,c), Iapc = (Tfloat)(*this)(ax,py,z,c),
-        Ipc = Icpc + 0.5f*(dx*(-Ippc + Inpc) + dx*dx*(2*Ippc - 5*Icpc + 4*Inpc - Iapc) +
-                           dx*dx*dx*(-Ippc + 3*Icpc - 3*Inpc + Iapc)),
-        Ipcc = (Tfloat)(*this)(px,y,z,c),  Iccc = (Tfloat)(*this)(x, y,z,c),
-        Incc = (Tfloat)(*this)(nx,y,z,c),  Iacc = (Tfloat)(*this)(ax,y,z,c),
-        Icc = Iccc + 0.5f*(dx*(-Ipcc + Incc) + dx*dx*(2*Ipcc - 5*Iccc + 4*Incc - Iacc) +
-                           dx*dx*dx*(-Ipcc + 3*Iccc - 3*Incc + Iacc)),
-        Ipnc = (Tfloat)(*this)(px,ny,z,c), Icnc = (Tfloat)(*this)(x,ny,z,c),
-        Innc = (Tfloat)(*this)(nx,ny,z,c), Ianc = (Tfloat)(*this)(ax,ny,z,c),
-        Inc = Icnc + 0.5f*(dx*(-Ipnc + Innc) + dx*dx*(2*Ipnc - 5*Icnc + 4*Innc - Ianc) +
-                           dx*dx*dx*(-Ipnc + 3*Icnc - 3*Innc + Ianc)),
-        Ipac = (Tfloat)(*this)(px,ay,z,c), Icac = (Tfloat)(*this)(x,ay,z,c),
-        Inac = (Tfloat)(*this)(nx,ay,z,c), Iaac = (Tfloat)(*this)(ax,ay,z,c),
-        Iac = Icac + 0.5f*(dx*(-Ipac + Inac) + dx*dx*(2*Ipac - 5*Icac + 4*Inac - Iaac) +
-                           dx*dx*dx*(-Ipac + 3*Icac - 3*Inac + Iaac)),
-        Ic = Icc + 0.5f*(dy*(-Ipc + Inc) + dy*dy*(2*Ipc - 5*Icc + 4*Inc - Iac) +
-                         dy*dy*dy*(-Ipc + 3*Icc - 3*Inc + Iac)),
-        Ippn = (Tfloat)(*this)(px,py,nz,c), Icpn = (Tfloat)(*this)(x,py,nz,c),
-        Inpn = (Tfloat)(*this)(nx,py,nz,c), Iapn = (Tfloat)(*this)(ax,py,nz,c),
-        Ipn = Icpn + 0.5f*(dx*(-Ippn + Inpn) + dx*dx*(2*Ippn - 5*Icpn + 4*Inpn - Iapn) +
-                           dx*dx*dx*(-Ippn + 3*Icpn - 3*Inpn + Iapn)),
-        Ipcn = (Tfloat)(*this)(px,y,nz,c),  Iccn = (Tfloat)(*this)(x, y,nz,c),
-        Incn = (Tfloat)(*this)(nx,y,nz,c),  Iacn = (Tfloat)(*this)(ax,y,nz,c),
-        Icn = Iccn + 0.5f*(dx*(-Ipcn + Incn) + dx*dx*(2*Ipcn - 5*Iccn + 4*Incn - Iacn) +
-                           dx*dx*dx*(-Ipcn + 3*Iccn - 3*Incn + Iacn)),
-        Ipnn = (Tfloat)(*this)(px,ny,nz,c), Icnn = (Tfloat)(*this)(x,ny,nz,c),
-        Innn = (Tfloat)(*this)(nx,ny,nz,c), Iann = (Tfloat)(*this)(ax,ny,nz,c),
-        Inn = Icnn + 0.5f*(dx*(-Ipnn + Innn) + dx*dx*(2*Ipnn - 5*Icnn + 4*Innn - Iann) +
-                           dx*dx*dx*(-Ipnn + 3*Icnn - 3*Innn + Iann)),
-        Ipan = (Tfloat)(*this)(px,ay,nz,c), Ican = (Tfloat)(*this)(x,ay,nz,c),
-        Inan = (Tfloat)(*this)(nx,ay,nz,c), Iaan = (Tfloat)(*this)(ax,ay,nz,c),
-        Ian = Ican + 0.5f*(dx*(-Ipan + Inan) + dx*dx*(2*Ipan - 5*Ican + 4*Inan - Iaan) +
-                           dx*dx*dx*(-Ipan + 3*Ican - 3*Inan + Iaan)),
-        In = Icn + 0.5f*(dy*(-Ipn + Inn) + dy*dy*(2*Ipn - 5*Icn + 4*Inn - Ian) +
-                         dy*dy*dy*(-Ipn + 3*Icn - 3*Inn + Ian)),
-        Ippa = (Tfloat)(*this)(px,py,az,c), Icpa = (Tfloat)(*this)(x,py,az,c),
-        Inpa = (Tfloat)(*this)(nx,py,az,c), Iapa = (Tfloat)(*this)(ax,py,az,c),
-        Ipa = Icpa + 0.5f*(dx*(-Ippa + Inpa) + dx*dx*(2*Ippa - 5*Icpa + 4*Inpa - Iapa) +
-                           dx*dx*dx*(-Ippa + 3*Icpa - 3*Inpa + Iapa)),
-        Ipca = (Tfloat)(*this)(px,y,az,c),  Icca = (Tfloat)(*this)(x, y,az,c),
-        Inca = (Tfloat)(*this)(nx,y,az,c),  Iaca = (Tfloat)(*this)(ax,y,az,c),
-        Ica = Icca + 0.5f*(dx*(-Ipca + Inca) + dx*dx*(2*Ipca - 5*Icca + 4*Inca - Iaca) +
-                           dx*dx*dx*(-Ipca + 3*Icca - 3*Inca + Iaca)),
-        Ipna = (Tfloat)(*this)(px,ny,az,c), Icna = (Tfloat)(*this)(x,ny,az,c),
-        Inna = (Tfloat)(*this)(nx,ny,az,c), Iana = (Tfloat)(*this)(ax,ny,az,c),
-        Ina = Icna + 0.5f*(dx*(-Ipna + Inna) + dx*dx*(2*Ipna - 5*Icna + 4*Inna - Iana) +
-                           dx*dx*dx*(-Ipna + 3*Icna - 3*Inna + Iana)),
-        Ipaa = (Tfloat)(*this)(px,ay,az,c), Icaa = (Tfloat)(*this)(x,ay,az,c),
-        Inaa = (Tfloat)(*this)(nx,ay,az,c), Iaaa = (Tfloat)(*this)(ax,ay,az,c),
-        Iaa = Icaa + 0.5f*(dx*(-Ipaa + Inaa) + dx*dx*(2*Ipaa - 5*Icaa + 4*Inaa - Iaaa) +
-                           dx*dx*dx*(-Ipaa + 3*Icaa - 3*Inaa + Iaaa)),
-        Ia = Ica + 0.5f*(dy*(-Ipa + Ina) + dy*dy*(2*Ipa - 5*Ica + 4*Ina - Iaa) +
-                         dy*dy*dy*(-Ipa + 3*Ica - 3*Ina + Iaa));
-      return Ic + 0.5f*(dz*(-Ip + In) + dz*dz*(2*Ip - 5*Ic + 4*In - Ia) + dz*dz*dz*(-Ip + 3*Ic - 3*In + Ia));
-    }
-
-    //! Return damped pixel value, using cubic interpolation and Neumann boundary conditions for the XYZ-coordinates.
-    /**
-       Similar to cubic_atXYZ(float,float,float,int) const, except that you can specify the authorized minimum and
-       maximum of the returned value.
-    **/
-    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c,
-                       const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = cubic_atXYZ(fx,fy,fz,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    Tfloat _cubic_atXYZ(const float fx, const float fy, const float fz, const int c,
-                        const Tfloat min_value, const Tfloat max_value) const {
-      const Tfloat val = _cubic_atXYZ(fx,fy,fz,c);
-      return val<min_value?min_value:val>max_value?max_value:val;
-    }
-
-    //! Set pixel value, using linear interpolation for the X-coordinates.
-    /**
-       Set pixel value at specified coordinates (\c fx,\c y,\c z,\c c) in the image instance, in a way that
-       the value is spread amongst several neighbors if the pixel coordinates are float-valued.
-       \param value Pixel value to set.
-       \param fx X-coordinate of the pixel value (float-valued).
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param is_added Tells if the pixel value is added to (\c true), or simply replace (\c false) the current image
-         pixel(s).
-       \return A reference to the current image instance.
-       \note
-       - Calling this method with out-of-bounds coordinates does nothing.
-    **/
-    CImg<T>& set_linear_atX(const T& value, const float fx, const int y=0, const int z=0, const int c=0,
-                            const bool is_added=false) {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1;
-      const float
-        dx = fx - x;
-      if (y>=0 && y<height() && z>=0 && z<depth() && c>=0 && c<spectrum()) {
-        if (x>=0 && x<width()) {
-          const float w1 = 1 - dx, w2 = is_added?1:(1 - w1);
-          (*this)(x,y,z,c) = (T)(w1*value + w2*(*this)(x,y,z,c));
-        }
-        if (nx>=0 && nx<width()) {
-          const float w1 = dx, w2 = is_added?1:(1 - w1);
-          (*this)(nx,y,z,c) = (T)(w1*value + w2*(*this)(nx,y,z,c));
-        }
-      }
-      return *this;
-    }
-
-    //! Set pixel value, using linear interpolation for the X and Y-coordinates.
-    /**
-       Similar to set_linear_atX(const T&,float,int,int,int,bool), except that the linear interpolation
-       is achieved both for X and Y-coordinates.
-    **/
-    CImg<T>& set_linear_atXY(const T& value, const float fx, const float fy=0, const int z=0, const int c=0,
-                             const bool is_added=false) {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1,
-        y = (int)fy - (fy>=0?0:1), ny = y + 1;
-      const float
-        dx = fx - x,
-        dy = fy - y;
-      if (z>=0 && z<depth() && c>=0 && c<spectrum()) {
-        if (y>=0 && y<height()) {
-          if (x>=0 && x<width()) {
-            const float w1 = (1 - dx)*(1 - dy), w2 = is_added?1:(1 - w1);
-            (*this)(x,y,z,c) = (T)(w1*value + w2*(*this)(x,y,z,c));
-          }
-          if (nx>=0 && nx<width()) {
-            const float w1 = dx*(1 - dy), w2 = is_added?1:(1 - w1);
-            (*this)(nx,y,z,c) = (T)(w1*value + w2*(*this)(nx,y,z,c));
-          }
-        }
-        if (ny>=0 && ny<height()) {
-          if (x>=0 && x<width()) {
-            const float w1 = (1 - dx)*dy, w2 = is_added?1:(1 - w1);
-            (*this)(x,ny,z,c) = (T)(w1*value + w2*(*this)(x,ny,z,c));
-          }
-          if (nx>=0 && nx<width()) {
-            const float w1 = dx*dy, w2 = is_added?1:(1 - w1);
-            (*this)(nx,ny,z,c) = (T)(w1*value + w2*(*this)(nx,ny,z,c));
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Set pixel value, using linear interpolation for the X,Y and Z-coordinates.
-    /**
-       Similar to set_linear_atXY(const T&,float,float,int,int,bool), except that the linear interpolation
-       is achieved both for X,Y and Z-coordinates.
-    **/
-    CImg<T>& set_linear_atXYZ(const T& value, const float fx, const float fy=0, const float fz=0, const int c=0,
-                              const bool is_added=false) {
-      const int
-        x = (int)fx - (fx>=0?0:1), nx = x + 1,
-        y = (int)fy - (fy>=0?0:1), ny = y + 1,
-        z = (int)fz - (fz>=0?0:1), nz = z + 1;
-      const float
-        dx = fx - x,
-        dy = fy - y,
-        dz = fz - z;
-      if (c>=0 && c<spectrum()) {
-        if (z>=0 && z<depth()) {
-          if (y>=0 && y<height()) {
-            if (x>=0 && x<width()) {
-              const float w1 = (1 - dx)*(1 - dy)*(1 - dz), w2 = is_added?1:(1 - w1);
-              (*this)(x,y,z,c) = (T)(w1*value + w2*(*this)(x,y,z,c));
-            }
-            if (nx>=0 && nx<width()) {
-              const float w1 = dx*(1 - dy)*(1 - dz), w2 = is_added?1:(1 - w1);
-              (*this)(nx,y,z,c) = (T)(w1*value + w2*(*this)(nx,y,z,c));
-            }
-          }
-          if (ny>=0 && ny<height()) {
-            if (x>=0 && x<width()) {
-              const float w1 = (1 - dx)*dy*(1 - dz), w2 = is_added?1:(1 - w1);
-              (*this)(x,ny,z,c) = (T)(w1*value + w2*(*this)(x,ny,z,c));
-            }
-            if (nx>=0 && nx<width()) {
-              const float w1 = dx*dy*(1 - dz), w2 = is_added?1:(1 - w1);
-              (*this)(nx,ny,z,c) = (T)(w1*value + w2*(*this)(nx,ny,z,c));
-            }
-          }
-        }
-        if (nz>=0 && nz<depth()) {
-          if (y>=0 && y<height()) {
-            if (x>=0 && x<width()) {
-              const float w1 = (1 - dx)*(1 - dy)*dz, w2 = is_added?1:(1 - w1);
-              (*this)(x,y,nz,c) = (T)(w1*value + w2*(*this)(x,y,nz,c));
-            }
-            if (nx>=0 && nx<width()) {
-              const float w1 = dx*(1 - dy)*dz, w2 = is_added?1:(1 - w1);
-              (*this)(nx,y,nz,c) = (T)(w1*value + w2*(*this)(nx,y,nz,c));
-            }
-          }
-          if (ny>=0 && ny<height()) {
-            if (x>=0 && x<width()) {
-              const float w1 = (1 - dx)*dy*dz, w2 = is_added?1:(1 - w1);
-              (*this)(x,ny,nz,c) = (T)(w1*value + w2*(*this)(x,ny,nz,c));
-            }
-            if (nx>=0 && nx<width()) {
-              const float w1 = dx*dy*dz, w2 = is_added?1:(1 - w1);
-              (*this)(nx,ny,nz,c) = (T)(w1*value + w2*(*this)(nx,ny,nz,c));
-            }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Return a C-string containing a list of all values of the image instance.
-    /**
-       Return a new \c CImg<char> image whose buffer data() is a \c char* string describing the list of all pixel values
-       of the image instance (written in base 10), separated by specified \c separator character.
-       \param separator A \c char character which specifies the separator between values in the returned C-string.
-       \param max_size Maximum size of the returned image.
-       \param format For float-values, tell the printf format used to generate the ascii representation of the numbers.
-         (or \c 0 for default representation).
-       \note
-       - The returned image is never empty.
-       - For an empty image instance, the returned string is <tt>""</tt>.
-       - If \c max_size is equal to \c 0, there are no limits on the size of the returned string.
-       - Otherwise, if the maximum number of string characters is exceeded, the value string is cut off
-         and terminated by character \c '\0'. In that case, the returned image size is <tt>max_size + 1</tt>.
-    **/
-    CImg<charT> value_string(const char separator=',', const unsigned int max_size=0,
-                             const char *const format=0) const {
-      if (is_empty()) return CImg<charT>::string("");
-      CImgList<charT> items;
-      CImg<charT> s_item(256); *s_item = 0;
-      const T *ptrs = _data;
-      unsigned int string_size = 0;
-      const char *const _format = format?format:cimg::type<T>::format();
-      for (ulongT off = 0, siz = size(); off<siz && string_size<=max_size; ++off) {
-        const unsigned int printed_size = 1U + cimg_snprintf(s_item,s_item._width,_format,
-                                                             cimg::type<T>::format(*(ptrs++)));
-        CImg<charT> item(s_item._data,printed_size);
-        item[printed_size - 1] = separator;
-        item.move_to(items);
-        if (max_size) string_size+=printed_size;
-      }
-      CImg<charT> res;
-      (items>'x').move_to(res);
-      if (max_size && res._width>max_size) res.crop(0,max_size);
-      res.back() = 0;
-      return res;
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Instance Checking
-    //@{
-    //-------------------------------------
-
-    //! Test shared state of the pixel buffer.
-    /**
-       Return \c true if image instance has a shared memory buffer, and \c false otherwise.
-       \note
-       - A shared image do not own his pixel buffer data() and will not deallocate it on destruction.
-       - Most of the time, a \c CImg<T> image instance will \e not be shared.
-       - A shared image can only be obtained by a limited set of constructors and methods (see list below).
-    **/
-    bool is_shared() const {
-      return _is_shared;
-    }
-
-    //! Test if image instance is empty.
-    /**
-       Return \c true, if image instance is empty, i.e. does \e not contain any pixel values, has dimensions
-       \c 0 x \c 0 x \c 0 x \c 0 and a pixel buffer pointer set to \c 0 (null pointer), and \c false otherwise.
-    **/
-    bool is_empty() const {
-      return !(_data && _width && _height && _depth && _spectrum);
-    }
-
-    //! Test if image instance contains a 'inf' value.
-    /**
-       Return \c true, if image instance contains a 'inf' value, and \c false otherwise.
-    **/
-    bool is_inf() const {
-      if (cimg::type<T>::is_float()) cimg_for(*this,p,T) if (cimg::type<T>::is_inf((float)*p)) return true;
-      return false;
-    }
-
-    //! Test if image instance contains a NaN value.
-    /**
-       Return \c true, if image instance contains a NaN value, and \c false otherwise.
-    **/
-    bool is_nan() const {
-      if (cimg::type<T>::is_float()) cimg_for(*this,p,T) if (cimg::type<T>::is_nan((float)*p)) return true;
-      return false;
-    }
-
-    //! Test if image width is equal to specified value.
-    bool is_sameX(const unsigned int size_x) const {
-      return _width==size_x;
-    }
-
-    //! Test if image width is equal to specified value.
-    template<typename t>
-    bool is_sameX(const CImg<t>& img) const {
-      return is_sameX(img._width);
-    }
-
-    //! Test if image width is equal to specified value.
-    bool is_sameX(const CImgDisplay& disp) const {
-      return is_sameX(disp._width);
-    }
-
-    //! Test if image height is equal to specified value.
-    bool is_sameY(const unsigned int size_y) const {
-      return _height==size_y;
-    }
-
-    //! Test if image height is equal to specified value.
-    template<typename t>
-    bool is_sameY(const CImg<t>& img) const {
-      return is_sameY(img._height);
-    }
-
-    //! Test if image height is equal to specified value.
-    bool is_sameY(const CImgDisplay& disp) const {
-      return is_sameY(disp._height);
-    }
-
-    //! Test if image depth is equal to specified value.
-    bool is_sameZ(const unsigned int size_z) const {
-      return _depth==size_z;
-    }
-
-    //! Test if image depth is equal to specified value.
-    template<typename t>
-    bool is_sameZ(const CImg<t>& img) const {
-      return is_sameZ(img._depth);
-    }
-
-    //! Test if image spectrum is equal to specified value.
-    bool is_sameC(const unsigned int size_c) const {
-      return _spectrum==size_c;
-    }
-
-    //! Test if image spectrum is equal to specified value.
-    template<typename t>
-    bool is_sameC(const CImg<t>& img) const {
-      return is_sameC(img._spectrum);
-    }
-
-    //! Test if image width and height are equal to specified values.
-    /**
-       Test if is_sameX(unsigned int) const and is_sameY(unsigned int) const are both verified.
-    **/
-    bool is_sameXY(const unsigned int size_x, const unsigned int size_y) const {
-      return _width==size_x && _height==size_y;
-    }
-
-    //! Test if image width and height are the same as that of another image.
-    /**
-       Test if is_sameX(const CImg<t>&) const and is_sameY(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXY(const CImg<t>& img) const {
-      return is_sameXY(img._width,img._height);
-    }
-
-    //! Test if image width and height are the same as that of an existing display window.
-    /**
-       Test if is_sameX(const CImgDisplay&) const and is_sameY(const CImgDisplay&) const are both verified.
-    **/
-    bool is_sameXY(const CImgDisplay& disp) const {
-      return is_sameXY(disp._width,disp._height);
-    }
-
-    //! Test if image width and depth are equal to specified values.
-    /**
-       Test if is_sameX(unsigned int) const and is_sameZ(unsigned int) const are both verified.
-    **/
-    bool is_sameXZ(const unsigned int size_x, const unsigned int size_z) const {
-      return _width==size_x && _depth==size_z;
-    }
-
-    //! Test if image width and depth are the same as that of another image.
-    /**
-       Test if is_sameX(const CImg<t>&) const and is_sameZ(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXZ(const CImg<t>& img) const {
-      return is_sameXZ(img._width,img._depth);
-    }
-
-    //! Test if image width and spectrum are equal to specified values.
-    /**
-       Test if is_sameX(unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameXC(const unsigned int size_x, const unsigned int size_c) const {
-      return _width==size_x && _spectrum==size_c;
-    }
-
-    //! Test if image width and spectrum are the same as that of another image.
-    /**
-       Test if is_sameX(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXC(const CImg<t>& img) const {
-      return is_sameXC(img._width,img._spectrum);
-    }
-
-    //! Test if image height and depth are equal to specified values.
-    /**
-       Test if is_sameY(unsigned int) const and is_sameZ(unsigned int) const are both verified.
-    **/
-    bool is_sameYZ(const unsigned int size_y, const unsigned int size_z) const {
-      return _height==size_y && _depth==size_z;
-    }
-
-    //! Test if image height and depth are the same as that of another image.
-    /**
-       Test if is_sameY(const CImg<t>&) const and is_sameZ(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameYZ(const CImg<t>& img) const {
-      return is_sameYZ(img._height,img._depth);
-    }
-
-    //! Test if image height and spectrum are equal to specified values.
-    /**
-       Test if is_sameY(unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameYC(const unsigned int size_y, const unsigned int size_c) const {
-      return _height==size_y && _spectrum==size_c;
-    }
-
-    //! Test if image height and spectrum are the same as that of another image.
-    /**
-       Test if is_sameY(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameYC(const CImg<t>& img) const {
-      return is_sameYC(img._height,img._spectrum);
-    }
-
-    //! Test if image depth and spectrum are equal to specified values.
-    /**
-       Test if is_sameZ(unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameZC(const unsigned int size_z, const unsigned int size_c) const {
-      return _depth==size_z && _spectrum==size_c;
-    }
-
-    //! Test if image depth and spectrum are the same as that of another image.
-    /**
-       Test if is_sameZ(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameZC(const CImg<t>& img) const {
-      return is_sameZC(img._depth,img._spectrum);
-    }
-
-    //! Test if image width, height and depth are equal to specified values.
-    /**
-       Test if is_sameXY(unsigned int,unsigned int) const and is_sameZ(unsigned int) const are both verified.
-    **/
-    bool is_sameXYZ(const unsigned int size_x, const unsigned int size_y, const unsigned int size_z) const {
-      return is_sameXY(size_x,size_y) && _depth==size_z;
-    }
-
-    //! Test if image width, height and depth are the same as that of another image.
-    /**
-       Test if is_sameXY(const CImg<t>&) const and is_sameZ(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXYZ(const CImg<t>& img) const {
-      return is_sameXYZ(img._width,img._height,img._depth);
-    }
-
-    //! Test if image width, height and spectrum are equal to specified values.
-    /**
-       Test if is_sameXY(unsigned int,unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameXYC(const unsigned int size_x, const unsigned int size_y, const unsigned int size_c) const {
-      return is_sameXY(size_x,size_y) && _spectrum==size_c;
-    }
-
-    //! Test if image width, height and spectrum are the same as that of another image.
-    /**
-       Test if is_sameXY(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXYC(const CImg<t>& img) const {
-      return is_sameXYC(img._width,img._height,img._spectrum);
-    }
-
-    //! Test if image width, depth and spectrum are equal to specified values.
-    /**
-       Test if is_sameXZ(unsigned int,unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameXZC(const unsigned int size_x, const unsigned int size_z, const unsigned int size_c) const {
-      return is_sameXZ(size_x,size_z) && _spectrum==size_c;
-    }
-
-    //! Test if image width, depth and spectrum are the same as that of another image.
-    /**
-       Test if is_sameXZ(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXZC(const CImg<t>& img) const {
-      return is_sameXZC(img._width,img._depth,img._spectrum);
-    }
-
-    //! Test if image height, depth and spectrum are equal to specified values.
-    /**
-       Test if is_sameYZ(unsigned int,unsigned int) const and is_sameC(unsigned int) const are both verified.
-    **/
-    bool is_sameYZC(const unsigned int size_y, const unsigned int size_z, const unsigned int size_c) const {
-      return is_sameYZ(size_y,size_z) && _spectrum==size_c;
-    }
-
-    //! Test if image height, depth and spectrum are the same as that of another image.
-    /**
-       Test if is_sameYZ(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameYZC(const CImg<t>& img) const {
-      return is_sameYZC(img._height,img._depth,img._spectrum);
-    }
-
-    //! Test if image width, height, depth and spectrum are equal to specified values.
-    /**
-       Test if is_sameXYZ(unsigned int,unsigned int,unsigned int) const and is_sameC(unsigned int) const are both
-       verified.
-    **/
-    bool is_sameXYZC(const unsigned int size_x, const unsigned int size_y,
-                     const unsigned int size_z, const unsigned int size_c) const {
-      return is_sameXYZ(size_x,size_y,size_z) && _spectrum==size_c;
-    }
-
-    //! Test if image width, height, depth and spectrum are the same as that of another image.
-    /**
-       Test if is_sameXYZ(const CImg<t>&) const and is_sameC(const CImg<t>&) const are both verified.
-    **/
-    template<typename t>
-    bool is_sameXYZC(const CImg<t>& img) const {
-      return is_sameXYZC(img._width,img._height,img._depth,img._spectrum);
-    }
-
-    //! Test if specified coordinates are inside image bounds.
-    /**
-       Return \c true if pixel located at (\c x,\c y,\c z,\c c) is inside bounds of the image instance,
-       and \c false otherwise.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note
-       - Return \c true only if all these conditions are verified:
-         - The image instance is \e not empty.
-         - <tt>0<=x<=\ref width() - 1</tt>.
-         - <tt>0<=y<=\ref height() - 1</tt>.
-         - <tt>0<=z<=\ref depth() - 1</tt>.
-         - <tt>0<=c<=\ref spectrum() - 1</tt>.
-    **/
-    bool containsXYZC(const int x, const int y=0, const int z=0, const int c=0) const {
-      return !is_empty() && x>=0 && x<width() && y>=0 && y<height() && z>=0 && z<depth() && c>=0 && c<spectrum();
-    }
-
-    //! Test if pixel value is inside image bounds and get its X,Y,Z and C-coordinates.
-    /**
-       Return \c true, if specified reference refers to a pixel value inside bounds of the image instance,
-       and \c false otherwise.
-       \param pixel Reference to pixel value to test.
-       \param[out] x X-coordinate of the pixel value, if test succeeds.
-       \param[out] y Y-coordinate of the pixel value, if test succeeds.
-       \param[out] z Z-coordinate of the pixel value, if test succeeds.
-       \param[out] c C-coordinate of the pixel value, if test succeeds.
-       \note
-       - Useful to convert an offset to a buffer value into pixel value coordinates:
-       \code
-       const CImg<float> img(100,100,1,3);      // Construct a 100x100 RGB color image.
-       const unsigned long offset = 1249;       // Offset to the pixel (49,12,0,0).
-       unsigned int x,y,z,c;
-       if (img.contains(img[offset],x,y,z,c)) { // Convert offset to (x,y,z,c) coordinates.
-         std::printf("Offset %u refers to pixel located at (%u,%u,%u,%u).\n",
-                     offset,x,y,z,c);
-       }
-       \endcode
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& x, t& y, t& z, t& c) const {
-      const ulongT wh = (ulongT)_width*_height, whd = wh*_depth, siz = whd*_spectrum;
-      const T *const ppixel = &pixel;
-      if (is_empty() || ppixel<_data || ppixel>=_data + siz) return false;
-      ulongT off = (ulongT)(ppixel - _data);
-      const ulongT nc = off/whd;
-      off%=whd;
-      const ulongT nz = off/wh;
-      off%=wh;
-      const ulongT ny = off/_width, nx = off%_width;
-      x = (t)nx; y = (t)ny; z = (t)nz; c = (t)nc;
-      return true;
-    }
-
-    //! Test if pixel value is inside image bounds and get its X,Y and Z-coordinates.
-    /**
-       Similar to contains(const T&,t&,t&,t&,t&) const, except that only the X,Y and Z-coordinates are set.
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& x, t& y, t& z) const {
-      const ulongT wh = (ulongT)_width*_height, whd = wh*_depth, siz = whd*_spectrum;
-      const T *const ppixel = &pixel;
-      if (is_empty() || ppixel<_data || ppixel>=_data + siz) return false;
-      ulongT off = ((ulongT)(ppixel - _data))%whd;
-      const ulongT nz = off/wh;
-      off%=wh;
-      const ulongT ny = off/_width, nx = off%_width;
-      x = (t)nx; y = (t)ny; z = (t)nz;
-      return true;
-    }
-
-    //! Test if pixel value is inside image bounds and get its X and Y-coordinates.
-    /**
-       Similar to contains(const T&,t&,t&,t&,t&) const, except that only the X and Y-coordinates are set.
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& x, t& y) const {
-      const ulongT wh = (ulongT)_width*_height, siz = wh*_depth*_spectrum;
-      const T *const ppixel = &pixel;
-      if (is_empty() || ppixel<_data || ppixel>=_data + siz) return false;
-      ulongT off = ((unsigned int)(ppixel - _data))%wh;
-      const ulongT ny = off/_width, nx = off%_width;
-      x = (t)nx; y = (t)ny;
-      return true;
-    }
-
-    //! Test if pixel value is inside image bounds and get its X-coordinate.
-    /**
-       Similar to contains(const T&,t&,t&,t&,t&) const, except that only the X-coordinate is set.
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& x) const {
-      const T *const ppixel = &pixel;
-      if (is_empty() || ppixel<_data || ppixel>=_data + size()) return false;
-      x = (t)(((ulongT)(ppixel - _data))%_width);
-      return true;
-    }
-
-    //! Test if pixel value is inside image bounds.
-    /**
-       Similar to contains(const T&,t&,t&,t&,t&) const, except that no pixel coordinates are set.
-    **/
-    bool contains(const T& pixel) const {
-      const T *const ppixel = &pixel;
-      return !is_empty() && ppixel>=_data && ppixel<_data + size();
-    }
-
-    //! Test if pixel buffers of instance and input images overlap.
-    /**
-       Return \c true, if pixel buffers attached to image instance and input image \c img overlap,
-       and \c false otherwise.
-       \param img Input image to compare with.
-       \note
-       - Buffer overlapping may happen when manipulating \e shared images.
-       - If two image buffers overlap, operating on one of the image will probably modify the other one.
-       - Most of the time, \c CImg<T> instances are \e non-shared and do not overlap between each others.
-       \par Example
-       \code
-       const CImg<float>
-         img1("reference.jpg"),             // Load RGB-color image.
-         img2 = img1.get_shared_channel(1); // Get shared version of the green channel.
-       if (img1.is_overlapped(img2)) {      // Test succeeds, 'img1' and 'img2' overlaps.
-         std::printf("Buffers overlap!\n");
-       }
-       \endcode
-    **/
-    template<typename t>
-    bool is_overlapped(const CImg<t>& img) const {
-      const ulongT csiz = size(), isiz = img.size();
-      return !((void*)(_data + csiz)<=(void*)img._data || (void*)_data>=(void*)(img._data + isiz));
-    }
-
-    //! Test if the set {\c *this,\c primitives,\c colors,\c opacities} defines a valid 3d object.
-    /**
-       Return \c true is the 3d object represented by the set {\c *this,\c primitives,\c colors,\c opacities} defines a
-       valid 3d object, and \c false otherwise. The vertex coordinates are defined by the instance image.
-       \param primitives List of primitives of the 3d object.
-       \param colors List of colors of the 3d object.
-       \param opacities List (or image) of opacities of the 3d object.
-       \param full_check Tells if full checking of the 3d object must be performed.
-       \param[out] error_message C-string to contain the error message, if the test does not succeed.
-       \note
-       - Set \c full_checking to \c false to speed-up the 3d object checking. In this case, only the size of
-         each 3d object component is checked.
-       - Size of the string \c error_message should be at least 128-bytes long, to be able to contain the error message.
-    **/
-    template<typename tp, typename tc, typename to>
-    bool is_object3d(const CImgList<tp>& primitives,
-                     const CImgList<tc>& colors,
-                     const to& opacities,
-                     const bool full_check=true,
-                     char *const error_message=0) const {
-      if (error_message) *error_message = 0;
-
-      // Check consistency for the particular case of an empty 3d object.
-      if (is_empty()) {
-        if (primitives || colors || opacities) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "3d object (%u,%u) defines no vertices but %u primitives, "
-                                          "%u colors and %lu opacities",
-                                          _width,primitives._width,primitives._width,
-                                          colors._width,(unsigned long)opacities.size());
-          return false;
-        }
-        return true;
-      }
-
-      // Check consistency of vertices.
-      if (_height!=3 || _depth>1 || _spectrum>1) { // Check vertices dimensions.
-        if (error_message) cimg_sprintf(error_message,
-                                        "3d object (%u,%u) has invalid vertex dimensions (%u,%u,%u,%u)",
-                                        _width,primitives._width,_width,_height,_depth,_spectrum);
-        return false;
-      }
-      if (colors._width>primitives._width + 1) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "3d object (%u,%u) defines %u colors",
-                                        _width,primitives._width,colors._width);
-        return false;
-      }
-      if (opacities.size()>primitives._width) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "3d object (%u,%u) defines %lu opacities",
-                                        _width,primitives._width,(unsigned long)opacities.size());
-        return false;
-      }
-      if (!full_check) return true;
-
-      // Check consistency of primitives.
-      cimglist_for(primitives,l) {
-        const CImg<tp>& primitive = primitives[l];
-        const unsigned int psiz = (unsigned int)primitive.size();
-        switch (psiz) {
-        case 1 : { // Point.
-          const unsigned int i0 = (unsigned int)primitive(0);
-          if (i0>=_width) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "3d object (%u,%u) refers to invalid vertex indice %u in "
-                                            "point primitive [%u]",
-                                            _width,primitives._width,i0,l);
-            return false;
-          }
-        } break;
-        case 5 : { // Sphere.
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1);
-          if (i0>=_width || i1>=_width) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u) in "
-                                            "sphere primitive [%u]",
-                                            _width,primitives._width,i0,i1,l);
-            return false;
-          }
-        } break;
-        case 2 : // Segment.
-        case 6 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1);
-          if (i0>=_width || i1>=_width) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u) in "
-                                            "segment primitive [%u]",
-                                            _width,primitives._width,i0,i1,l);
-            return false;
-          }
-        } break;
-        case 3 : // Triangle.
-        case 9 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1),
-            i2 = (unsigned int)primitive(2);
-          if (i0>=_width || i1>=_width || i2>=_width) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u,%u) in "
-                                            "triangle primitive [%u]",
-                                            _width,primitives._width,i0,i1,i2,l);
-            return false;
-          }
-        } break;
-        case 4 : // Quadrangle.
-        case 12 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1),
-            i2 = (unsigned int)primitive(2),
-            i3 = (unsigned int)primitive(3);
-          if (i0>=_width || i1>=_width || i2>=_width || i3>=_width) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u,%u,%u) in "
-                                            "quadrangle primitive [%u]",
-                                            _width,primitives._width,i0,i1,i2,i3,l);
-            return false;
-          }
-        } break;
-        default :
-          if (error_message) cimg_sprintf(error_message,
-                                          "3d object (%u,%u) defines an invalid primitive [%u] of size %u",
-                                          _width,primitives._width,l,(unsigned int)psiz);
-          return false;
-        }
-      }
-
-      // Check consistency of colors.
-      cimglist_for(colors,c) {
-        const CImg<tc>& color = colors[c];
-        if (!color) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "3d object (%u,%u) defines no color for primitive [%u]",
-                                          _width,primitives._width,c);
-          return false;
-        }
-      }
-
-      // Check consistency of light texture.
-      if (colors._width>primitives._width) {
-        const CImg<tc> &light = colors.back();
-        if (!light || light._depth>1) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "3d object (%u,%u) defines an invalid light texture (%u,%u,%u,%u)",
-                                          _width,primitives._width,light._width,
-                                          light._height,light._depth,light._spectrum);
-          return false;
-        }
-      }
-
-      return true;
-    }
-
-    //! Test if image instance represents a valid serialization of a 3d object.
-    /**
-       Return \c true if the image instance represents a valid serialization of a 3d object, and \c false otherwise.
-       \param full_check Tells if full checking of the instance must be performed.
-       \param[out] error_message C-string to contain the error message, if the test does not succeed.
-       \note
-       - Set \c full_check to \c false to speed-up the 3d object checking. In this case, only the size of
-         each 3d object component is checked.
-       - Size of the string \c error_message should be at least 128-bytes long, to be able to contain the error message.
-    **/
-    bool is_CImg3d(const bool full_check=true, char *const error_message=0) const {
-      if (error_message) *error_message = 0;
-
-      // Check instance dimension and header.
-      if (_width!=1 || _height<8 || _depth!=1 || _spectrum!=1) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d has invalid dimensions (%u,%u,%u,%u)",
-                                        _width,_height,_depth,_spectrum);
-        return false;
-      }
-      const T *ptrs = _data, *const ptre = end();
-      if (!_is_CImg3d(*(ptrs++),'C') || !_is_CImg3d(*(ptrs++),'I') || !_is_CImg3d(*(ptrs++),'m') ||
-          !_is_CImg3d(*(ptrs++),'g') || !_is_CImg3d(*(ptrs++),'3') || !_is_CImg3d(*(ptrs++),'d')) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d header not found");
-        return false;
-      }
-      const unsigned int
-        nb_points = cimg::float2uint((float)*(ptrs++)),
-        nb_primitives = cimg::float2uint((float)*(ptrs++));
-
-      // Check consistency of number of vertices / primitives.
-      if (!full_check) {
-        const ulongT minimal_size = 8UL + 3*nb_points + 6*nb_primitives;
-        if (_data + minimal_size>ptre) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) has only %lu values, while at least %lu values were expected",
-                                          nb_points,nb_primitives,(unsigned long)size(),(unsigned long)minimal_size);
-          return false;
-        }
-      }
-
-      // Check consistency of vertex data.
-      if (!nb_points) {
-        if (nb_primitives) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) defines no vertices but %u primitives",
-                                          nb_points,nb_primitives,nb_primitives);
-          return false;
-        }
-        if (ptrs!=ptre) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) is an empty object but contains %u value%s "
-                                          "more than expected",
-                                          nb_points,nb_primitives,(unsigned int)(ptre - ptrs),(ptre - ptrs)>1?"s":"");
-          return false;
-        }
-        return true;
-      }
-      if (ptrs + 3*nb_points>ptre) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d (%u,%u) defines only %u vertices data",
-                                        nb_points,nb_primitives,(unsigned int)(ptre - ptrs)/3);
-        return false;
-      }
-      ptrs+=3*nb_points;
-
-      // Check consistency of primitive data.
-      if (ptrs==ptre) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d (%u,%u) defines %u vertices but no primitive",
-                                        nb_points,nb_primitives,nb_points);
-        return false;
-      }
-
-      if (!full_check) return true;
-
-      for (unsigned int p = 0; p<nb_primitives; ++p) {
-        const unsigned int nb_inds = (unsigned int)*(ptrs++);
-        switch (nb_inds) {
-        case 1 : { // Point.
-          const unsigned int i0 = cimg::float2uint((float)*(ptrs++));
-          if (i0>=nb_points) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "CImg3d (%u,%u) refers to invalid vertex indice %u in point primitive [%u]",
-                                            nb_points,nb_primitives,i0,p);
-            return false;
-          }
-        } break;
-        case 5 : { // Sphere.
-          const unsigned int
-            i0 = cimg::float2uint((float)*(ptrs++)),
-            i1 = cimg::float2uint((float)*(ptrs++));
-          ptrs+=3;
-          if (i0>=nb_points || i1>=nb_points) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u) in "
-                                            "sphere primitive [%u]",
-                                            nb_points,nb_primitives,i0,i1,p);
-            return false;
-          }
-        } break;
-        case 2 : case 6 : { // Segment.
-          const unsigned int
-            i0 = cimg::float2uint((float)*(ptrs++)),
-            i1 = cimg::float2uint((float)*(ptrs++));
-          if (nb_inds==6) ptrs+=4;
-          if (i0>=nb_points || i1>=nb_points) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u) in "
-                                            "segment primitive [%u]",
-                                            nb_points,nb_primitives,i0,i1,p);
-            return false;
-          }
-        } break;
-        case 3 : case 9 : { // Triangle.
-          const unsigned int
-            i0 = cimg::float2uint((float)*(ptrs++)),
-            i1 = cimg::float2uint((float)*(ptrs++)),
-            i2 = cimg::float2uint((float)*(ptrs++));
-          if (nb_inds==9) ptrs+=6;
-          if (i0>=nb_points || i1>=nb_points || i2>=nb_points) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u,%u) in "
-                                            "triangle primitive [%u]",
-                                            nb_points,nb_primitives,i0,i1,i2,p);
-            return false;
-          }
-        } break;
-        case 4 : case 12 : { // Quadrangle.
-          const unsigned int
-            i0 = cimg::float2uint((float)*(ptrs++)),
-            i1 = cimg::float2uint((float)*(ptrs++)),
-            i2 = cimg::float2uint((float)*(ptrs++)),
-            i3 = cimg::float2uint((float)*(ptrs++));
-          if (nb_inds==12) ptrs+=8;
-          if (i0>=nb_points || i1>=nb_points || i2>=nb_points || i3>=nb_points) {
-            if (error_message) cimg_sprintf(error_message,
-                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u,%u,%u) in "
-                                            "quadrangle primitive [%u]",
-                                            nb_points,nb_primitives,i0,i1,i2,i3,p);
-            return false;
-          }
-        } break;
-        default :
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) defines an invalid primitive [%u] of size %u",
-                                          nb_points,nb_primitives,p,nb_inds);
-          return false;
-        }
-        if (ptrs>ptre) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) has incomplete primitive data for primitive [%u], "
-                                          "%u values missing",
-                                          nb_points,nb_primitives,p,(unsigned int)(ptrs - ptre));
-          return false;
-        }
-      }
-
-      // Check consistency of color data.
-      if (ptrs==ptre) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d (%u,%u) defines no color/texture data",
-                                        nb_points,nb_primitives);
-        return false;
-      }
-      for (unsigned int c = 0; c<nb_primitives; ++c) {
-        if (*(ptrs++)!=(T)-128) ptrs+=2;
-        else if ((ptrs+=3)<ptre) {
-          const unsigned int
-            w = (unsigned int)*(ptrs - 3),
-            h = (unsigned int)*(ptrs - 2),
-            s = (unsigned int)*(ptrs - 1);
-          if (!h && !s) {
-            if (w>=c) {
-              if (error_message) cimg_sprintf(error_message,
-                                              "CImg3d (%u,%u) refers to invalid shared sprite/texture indice %u "
-                                              "for primitive [%u]",
-                                              nb_points,nb_primitives,w,c);
-              return false;
-            }
-          } else ptrs+=w*h*s;
-        }
-        if (ptrs>ptre) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) has incomplete color/texture data for primitive [%u], "
-                                          "%u values missing",
-                                          nb_points,nb_primitives,c,(unsigned int)(ptrs - ptre));
-          return false;
-        }
-      }
-
-      // Check consistency of opacity data.
-      if (ptrs==ptre) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d (%u,%u) defines no opacity data",
-                                        nb_points,nb_primitives);
-        return false;
-      }
-      for (unsigned int o = 0; o<nb_primitives; ++o) {
-        if (*(ptrs++)==(T)-128 && (ptrs+=3)<ptre) {
-          const unsigned int
-            w = (unsigned int)*(ptrs - 3),
-            h = (unsigned int)*(ptrs - 2),
-            s = (unsigned int)*(ptrs - 1);
-          if (!h && !s) {
-            if (w>=o) {
-              if (error_message) cimg_sprintf(error_message,
-                                              "CImg3d (%u,%u) refers to invalid shared opacity indice %u "
-                                              "for primitive [%u]",
-                                              nb_points,nb_primitives,w,o);
-              return false;
-            }
-          } else ptrs+=w*h*s;
-        }
-        if (ptrs>ptre) {
-          if (error_message) cimg_sprintf(error_message,
-                                          "CImg3d (%u,%u) has incomplete opacity data for primitive [%u]",
-                                          nb_points,nb_primitives,o);
-          return false;
-        }
-      }
-
-      // Check end of data.
-      if (ptrs<ptre) {
-        if (error_message) cimg_sprintf(error_message,
-                                        "CImg3d (%u,%u) contains %u value%s more than expected",
-                                        nb_points,nb_primitives,(unsigned int)(ptre - ptrs),(ptre - ptrs)>1?"s":"");
-        return false;
-      }
-      return true;
-    }
-
-    static bool _is_CImg3d(const T val, const char c) {
-      return val>=(T)c && val<(T)(c + 1);
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Mathematical Functions
-    //@{
-    //-------------------------------------
-
-    // Define the math formula parser/compiler and expression evaluator.
-    struct _cimg_math_parser {
-      CImg<doubleT> mem;
-      CImg<intT> memtype;
-      CImgList<ulongT> _code, &code, code_init, code_end;
-      CImg<ulongT> opcode;
-      const CImg<ulongT> *p_code_end, *p_code;
-      const CImg<ulongT> *const p_break;
-
-      CImg<charT> expr, pexpr;
-      const CImg<T>& imgin;
-      const CImgList<T>& listin;
-      CImg<T> &imgout;
-      CImgList<T>& listout;
-
-      CImg<doubleT> _img_stats, &img_stats, constcache_vals;
-      CImgList<doubleT> _list_stats, &list_stats, _list_median, &list_median;
-      CImg<uintT> mem_img_stats, constcache_inds;
-
-      CImg<uintT> level, variable_pos, reserved_label;
-      CImgList<charT> variable_def, macro_def, macro_body;
-      CImgList<boolT> macro_body_is_string;
-      char *user_macro;
-
-      unsigned int mempos, mem_img_median, debug_indent, result_dim, break_type, constcache_size;
-      bool is_parallelizable, is_fill, need_input_copy;
-      double *result;
-      const char *const calling_function, *s_op, *ss_op;
-      typedef double (*mp_func)(_cimg_math_parser&);
-
-#define _cimg_mp_is_constant(arg) (memtype[arg]==1) // Is constant value?
-#define _cimg_mp_is_scalar(arg) (memtype[arg]<2) // Is scalar value?
-#define _cimg_mp_is_comp(arg) (!memtype[arg]) // Is computation value?
-#define _cimg_mp_is_variable(arg) (memtype[arg]==-1) // Is scalar variable?
-#define _cimg_mp_is_vector(arg) (memtype[arg]>1) // Is vector?
-#define _cimg_mp_vector_size(arg) (_cimg_mp_is_scalar(arg)?0U:(unsigned int)memtype[arg] - 1) // Vector size
-#define _cimg_mp_calling_function calling_function_s()._data
-#define _cimg_mp_op(s) s_op = s; ss_op = ss
-#define _cimg_mp_check_type(arg,n_arg,mode,N) check_type(arg,n_arg,mode,N,ss,se,saved_char)
-#define _cimg_mp_check_constant(arg,n_arg,mode) check_constant(arg,n_arg,mode,ss,se,saved_char)
-#define _cimg_mp_check_matrix_square(arg,n_arg) check_matrix_square(arg,n_arg,ss,se,saved_char)
-#define _cimg_mp_check_vector0(dim) check_vector0(dim,ss,se,saved_char)
-#define _cimg_mp_check_list(is_out) check_list(is_out,ss,se,saved_char)
-#define _cimg_mp_defunc(mp) (*(mp_func)(*(mp).opcode))(mp)
-#define _cimg_mp_return(x) { *se = saved_char; s_op = previous_s_op; ss_op = previous_ss_op; return x; }
-#define _cimg_mp_constant(val) _cimg_mp_return(constant((double)(val)))
-#define _cimg_mp_scalar0(op) _cimg_mp_return(scalar0(op))
-#define _cimg_mp_scalar1(op,i1) _cimg_mp_return(scalar1(op,i1))
-#define _cimg_mp_scalar2(op,i1,i2) _cimg_mp_return(scalar2(op,i1,i2))
-#define _cimg_mp_scalar3(op,i1,i2,i3) _cimg_mp_return(scalar3(op,i1,i2,i3))
-#define _cimg_mp_scalar4(op,i1,i2,i3,i4) _cimg_mp_return(scalar4(op,i1,i2,i3,i4))
-#define _cimg_mp_scalar5(op,i1,i2,i3,i4,i5) _cimg_mp_return(scalar5(op,i1,i2,i3,i4,i5))
-#define _cimg_mp_scalar6(op,i1,i2,i3,i4,i5,i6) _cimg_mp_return(scalar6(op,i1,i2,i3,i4,i5,i6))
-#define _cimg_mp_scalar7(op,i1,i2,i3,i4,i5,i6,i7) _cimg_mp_return(scalar7(op,i1,i2,i3,i4,i5,i6,i7))
-#define _cimg_mp_vector1_v(op,i1) _cimg_mp_return(vector1_v(op,i1))
-#define _cimg_mp_vector2_sv(op,i1,i2) _cimg_mp_return(vector2_sv(op,i1,i2))
-#define _cimg_mp_vector2_vs(op,i1,i2) _cimg_mp_return(vector2_vs(op,i1,i2))
-#define _cimg_mp_vector2_vv(op,i1,i2) _cimg_mp_return(vector2_vv(op,i1,i2))
-#define _cimg_mp_vector3_vss(op,i1,i2,i3) _cimg_mp_return(vector3_vss(op,i1,i2,i3))
-
-      // Constructors.
-      _cimg_math_parser(const char *const expression, const char *const funcname=0,
-                        const CImg<T>& img_input=CImg<T>::const_empty(), CImg<T> *const img_output=0,
-                        const CImgList<T> *const list_input=0, CImgList<T> *const list_output=0,
-                        const bool _is_fill=false):
-        code(_code),p_break((CImg<ulongT>*)(-2*sizeof(CImg<ulongT>))),
-        imgin(img_input),listin(list_input?*list_input:CImgList<T>::const_empty()),
-        imgout(img_output?*img_output:CImg<T>::empty()),listout(list_output?*list_output:CImgList<T>::empty()),
-        img_stats(_img_stats),list_stats(_list_stats),list_median(_list_median),user_macro(0),
-        mem_img_median(~0U),debug_indent(0),result_dim(0),break_type(0),constcache_size(0),
-        is_parallelizable(true),is_fill(_is_fill),need_input_copy(false),
-        calling_function(funcname?funcname:"cimg_math_parser") {
-        if (!expression || !*expression)
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: Empty expression.",
-                                      pixel_type(),_cimg_mp_calling_function);
-        const char *_expression = expression;
-        while (*_expression && ((signed char)*_expression<=' ' || *_expression==';')) ++_expression;
-        CImg<charT>::string(_expression).move_to(expr);
-        char *ps = &expr.back() - 1;
-        while (ps>expr._data && ((signed char)*ps<=' ' || *ps==';')) --ps;
-        *(++ps) = 0; expr._width = (unsigned int)(ps - expr._data + 1);
-
-        // Ease the retrieval of previous non-space characters afterwards.
-        pexpr.assign(expr._width);
-        char c, *pe = pexpr._data;
-        for (ps = expr._data, c = ' '; *ps; ++ps) {
-          if ((signed char)*ps>' ') c = *ps; else *ps = ' ';
-          *(pe++) = c;
-        }
-        *pe = 0;
-        level = get_level(expr);
-
-        // Init constant values.
-#define _cimg_mp_interpolation (reserved_label[29]!=~0U?reserved_label[29]:0)
-#define _cimg_mp_boundary (reserved_label[30]!=~0U?reserved_label[30]:0)
-#define _cimg_mp_slot_nan 29
-#define _cimg_mp_slot_x 30
-#define _cimg_mp_slot_y 31
-#define _cimg_mp_slot_z 32
-#define _cimg_mp_slot_c 33
-
-        mem.assign(96);
-        for (unsigned int i = 0; i<=10; ++i) mem[i] = (double)i; // mem[0-10] = 0...10
-        for (unsigned int i = 1; i<=5; ++i) mem[i + 10] = -(double)i; // mem[11-15] = -1...-5
-        mem[16] = 0.5;
-        mem[17] = 0; // thread_id
-        mem[18] = (double)imgin._width; // w
-        mem[19] = (double)imgin._height; // h
-        mem[20] = (double)imgin._depth; // d
-        mem[21] = (double)imgin._spectrum; // s
-        mem[22] = (double)imgin._is_shared; // r
-        mem[23] = (double)imgin._width*imgin._height; // wh
-        mem[24] = (double)imgin._width*imgin._height*imgin._depth; // whd
-        mem[25] = (double)imgin._width*imgin._height*imgin._depth*imgin._spectrum; // whds
-        mem[26] = (double)listin._width; // l
-        mem[27] = std::exp(1.0); // e
-        mem[28] = cimg::PI; // pi
-        mem[_cimg_mp_slot_nan] = cimg::type<double>::nan(); // nan
-
-        // Set value property :
-        // { -2 = other | -1 = variable | 0 = computation value |
-        //    1 = compile-time constant | N>1 = constant ptr to vector[N-1] }.
-        memtype.assign(mem._width,1,1,1,0);
-        for (unsigned int i = 0; i<_cimg_mp_slot_x; ++i) memtype[i] = 1;
-        memtype[17] = 0;
-        memtype[_cimg_mp_slot_x] = memtype[_cimg_mp_slot_y] = memtype[_cimg_mp_slot_z] = memtype[_cimg_mp_slot_c] = -2;
-        mempos = _cimg_mp_slot_c + 1;
-        variable_pos.assign(8);
-
-        reserved_label.assign(128,1,1,1,~0U);
-        // reserved_label[4-28] are used to store these two-char variables:
-        // [0] = wh, [1] = whd, [2] = whds, [3] = pi, [4] = im, [5] = iM, [6] = ia, [7] = iv,
-        // [8] = is, [9] = ip, [10] = ic, [11] = xm, [12] = ym, [13] = zm, [14] = cm, [15] = xM,
-        // [16] = yM, [17] = zM, [18]=cM, [19]=i0...[28]=i9, [29] = interpolation, [30] = boundary
-
-        // Compile expression into a serie of opcodes.
-        s_op = ""; ss_op = expr._data;
-        const unsigned int ind_result = compile(expr._data,expr._data + expr._width - 1,0,0);
-        if (!_cimg_mp_is_constant(ind_result)) {
-          if (_cimg_mp_is_vector(ind_result))
-            CImg<doubleT>(&mem[ind_result] + 1,_cimg_mp_vector_size(ind_result),1,1,1,true).
-              fill(cimg::type<double>::nan());
-          else mem[ind_result] = cimg::type<double>::nan();
-        }
-
-        // Free resources used for compiling expression and prepare evaluation.
-        result_dim = _cimg_mp_vector_size(ind_result);
-        mem.resize(mempos,1,1,1,-1);
-        result = mem._data + ind_result;
-        memtype.assign();
-        constcache_vals.assign();
-        constcache_inds.assign();
-        level.assign();
-        variable_pos.assign();
-        reserved_label.assign();
-        expr.assign();
-        pexpr.assign();
-        opcode.assign();
-        opcode._is_shared = true;
-
-        // Execute init() bloc if any specified.
-        if (code_init) {
-          mem[_cimg_mp_slot_x] = mem[_cimg_mp_slot_y] = mem[_cimg_mp_slot_z] = mem[_cimg_mp_slot_c] = 0;
-          p_code_end = code_init.end();
-          for (p_code = code_init; p_code<p_code_end; ++p_code) {
-            opcode._data = p_code->_data;
-            const ulongT target = opcode[1];
-            mem[target] = _cimg_mp_defunc(*this);
-          }
-        }
-        p_code_end = code.end();
-      }
-
-      _cimg_math_parser():
-        code(_code),p_code_end(0),p_break((CImg<ulongT>*)(-2*sizeof(CImg<ulongT>))),
-        imgin(CImg<T>::const_empty()),listin(CImgList<T>::const_empty()),
-        imgout(CImg<T>::empty()),listout(CImgList<T>::empty()),
-        img_stats(_img_stats),list_stats(_list_stats),list_median(_list_median),debug_indent(0),
-        result_dim(0),break_type(0),constcache_size(0),is_parallelizable(true),is_fill(false),need_input_copy(false),
-        calling_function(0) {
-        mem.assign(1 + _cimg_mp_slot_c,1,1,1,0); // Allow to skip 'is_empty?' test in operator()()
-        result = mem._data;
-      }
-
-      _cimg_math_parser(const _cimg_math_parser& mp):
-        mem(mp.mem),code(mp.code),p_code_end(mp.p_code_end),p_break(mp.p_break),
-        imgin(mp.imgin),listin(mp.listin),imgout(mp.imgout),listout(mp.listout),img_stats(mp.img_stats),
-        list_stats(mp.list_stats),list_median(mp.list_median),debug_indent(0),result_dim(mp.result_dim),
-        break_type(0),constcache_size(0),is_parallelizable(mp.is_parallelizable),is_fill(mp.is_fill),
-        need_input_copy(mp.need_input_copy), result(mem._data + (mp.result - mp.mem._data)),calling_function(0) {
-#ifdef cimg_use_openmp
-        mem[17] = omp_get_thread_num();
-#endif
-        opcode.assign();
-        opcode._is_shared = true;
-      }
-
-      // Count parentheses/brackets level of each character of the expression.
-      CImg<uintT> get_level(CImg<charT>& expr) const {
-        bool is_escaped = false, next_is_escaped = false;
-        unsigned int mode = 0, next_mode = 0; // { 0=normal | 1=char-string | 2=vector-string
-        CImg<uintT> res(expr._width - 1);
-        unsigned int *pd = res._data;
-        int level = 0;
-        for (const char *ps = expr._data; *ps && level>=0; ++ps) {
-          if (!is_escaped && !next_is_escaped && *ps=='\\') next_is_escaped = true;
-          if (!is_escaped && *ps=='\'') { // Non-escaped character
-            if (!mode && ps>expr._data && *(ps - 1)=='[') next_mode = mode = 2; // Start vector-string
-            else if (mode==2 && *(ps + 1)==']') next_mode = !mode; // End vector-string
-            else if (mode<2) next_mode = mode?(mode = 0):1; // Start/end char-string
-          }
-          *(pd++) = (unsigned int)(mode>=1 || is_escaped?level + (mode==1):
-                                   *ps=='(' || *ps=='['?level++:
-                                   *ps==')' || *ps==']'?--level:
-                                   level);
-          mode = next_mode;
-          is_escaped = next_is_escaped;
-          next_is_escaped = false;
-        }
-        if (mode) {
-          cimg::strellipsize(expr,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: Unterminated string literal, in expression '%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,
-                                      expr._data);
-        }
-        if (level) {
-          cimg::strellipsize(expr,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: Unbalanced parentheses/brackets, in expression '%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,
-                                      expr._data);
-        }
-        return res;
-      }
-
-      // Tell for each character of an expression if it is inside a string or not.
-      CImg<boolT> is_inside_string(CImg<charT>& expr) const {
-        bool is_escaped = false, next_is_escaped = false;
-        unsigned int mode = 0, next_mode = 0; // { 0=normal | 1=char-string | 2=vector-string
-        CImg<boolT> res = CImg<charT>::string(expr);
-        bool *pd = res._data;
-        for (const char *ps = expr._data; *ps; ++ps) {
-          if (!next_is_escaped && *ps=='\\') next_is_escaped = true;
-          if (!is_escaped && *ps=='\'') { // Non-escaped character
-            if (!mode && ps>expr._data && *(ps - 1)=='[') next_mode = mode = 2; // Start vector-string
-            else if (mode==2 && *(ps + 1)==']') next_mode = !mode; // End vector-string
-            else if (mode<2) next_mode = mode?(mode = 0):1; // Start/end char-string
-          }
-          *(pd++) = mode>=1 || is_escaped;
-          mode = next_mode;
-          is_escaped = next_is_escaped;
-          next_is_escaped = false;
-        }
-        return res;
-      }
-
-      // Compilation procedure.
-      unsigned int compile(char *ss, char *se, const unsigned int depth, unsigned int *const p_ref) {
-        if (depth>256) {
-          cimg::strellipsize(expr,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: Call stack overflow (infinite recursion?), "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,
-                                      (ss - 4)>expr._data?"...":"",
-                                      (ss - 4)>expr._data?ss - 4:expr._data,
-                                      se<&expr.back()?"...":"");
-        }
-        char c1, c2, c3, c4;
-
-        // Simplify expression when possible.
-        do {
-          c2 = 0;
-          if (ss<se) {
-            while (*ss && ((signed char)*ss<=' ' || *ss==';')) ++ss;
-            while (se>ss && ((signed char)(c1 = *(se - 1))<=' ' || c1==';')) --se;
-          }
-          while (*ss=='(' && *(se - 1)==')' && std::strchr(ss,')')==se - 1) {
-            ++ss; --se; c2 = 1;
-          }
-        } while (c2 && ss<se);
-
-        if (se<=ss || !*ss) {
-          cimg::strellipsize(expr,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s Missing %s, in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      *s_op=='F'?"argument":"item",
-                                      (ss_op - 4)>expr._data?"...":"",
-                                      (ss_op - 4)>expr._data?ss_op - 4:expr._data,
-                                      ss_op + std::strlen(ss_op)<&expr.back()?"...":"");
-        }
-
-        const char *const previous_s_op = s_op, *const previous_ss_op = ss_op;
-        const unsigned int depth1 = depth + 1;
-        unsigned int pos, p1, p2, p3, arg1, arg2, arg3, arg4, arg5, arg6;
-        char
-          *const se1 = se - 1, *const se2 = se - 2, *const se3 = se - 3,
-          *const ss1 = ss + 1, *const ss2 = ss + 2, *const ss3 = ss + 3, *const ss4 = ss + 4,
-          *const ss5 = ss + 5, *const ss6 = ss + 6, *const ss7 = ss + 7, *const ss8 = ss + 8,
-          *s, *ps, *ns, *s0, *s1, *s2, *s3, sep = 0, end = 0;
-        double val, val1, val2;
-        mp_func op;
-
-        // 'p_ref' is a 'unsigned int[7]' used to return a reference to an image or vector value
-        // linked to the returned memory slot (reference that cannot be determined at compile time).
-        // p_ref[0] can be { 0 = scalar (unlinked) | 1 = vector value | 2 = image value (offset) |
-        //                   3 = image value (coordinates) | 4 = image value as a vector (offsets) |
-        //                   5 = image value as a vector (coordinates) }.
-        // Depending on p_ref[0], the remaining p_ref[k] have the following meaning:
-        // When p_ref[0]==0, p_ref is actually unlinked.
-        // When p_ref[0]==1, p_ref = [ 1, vector_ind, offset ].
-        // When p_ref[0]==2, p_ref = [ 2, image_ind (or ~0U), is_relative, offset ].
-        // When p_ref[0]==3, p_ref = [ 3, image_ind (or ~0U), is_relative, x, y, z, c ].
-        // When p_ref[0]==4, p_ref = [ 4, image_ind (or ~0U), is_relative, offset ].
-        // When p_ref[0]==5, p_ref = [ 5, image_ind (or ~0U), is_relative, x, y, z ].
-        if (p_ref) { *p_ref = 0; p_ref[1] = p_ref[2] = p_ref[3] = p_ref[4] = p_ref[5] = p_ref[6] = ~0U; }
-
-        const char saved_char = *se; *se = 0;
-        const unsigned int clevel = level[ss - expr._data], clevel1 = clevel + 1;
-        bool is_sth, is_relative;
-        CImg<uintT> ref;
-        CImgList<ulongT> _opcode;
-        CImg<charT> variable_name;
-
-        // Look for a single value or a pre-defined variable.
-        int nb = cimg_sscanf(ss,"%lf%c%c",&val,&(sep=0),&(end=0));
-
-#if cimg_OS==2
-        // Check for +/-NaN and +/-inf as Microsoft's sscanf() version is not able
-        // to read those particular values.
-        if (!nb && (*ss=='+' || *ss=='-' || *ss=='i' || *ss=='I' || *ss=='n' || *ss=='N')) {
-          is_sth = true;
-          s = ss;
-          if (*s=='+') ++s; else if (*s=='-') { ++s; is_sth = false; }
-          if (!cimg::strcasecmp(s,"inf")) { val = cimg::type<double>::inf(); nb = 1; }
-          else if (!cimg::strcasecmp(s,"nan")) { val = cimg::type<double>::nan(); nb = 1; }
-          if (nb==1 && !is_sth) val = -val;
-        }
-#endif
-        if (nb==1) _cimg_mp_constant(val);
-        if (nb==2 && sep=='%') _cimg_mp_constant(val/100);
-
-        if (ss1==se) switch (*ss) { // One-char reserved variable
-          case 'c' : _cimg_mp_return(reserved_label['c']!=~0U?reserved_label['c']:_cimg_mp_slot_c);
-          case 'd' : _cimg_mp_return(reserved_label['d']!=~0U?reserved_label['d']:20);
-          case 'e' : _cimg_mp_return(reserved_label['e']!=~0U?reserved_label['e']:27);
-          case 'h' : _cimg_mp_return(reserved_label['h']!=~0U?reserved_label['h']:19);
-          case 'l' : _cimg_mp_return(reserved_label['l']!=~0U?reserved_label['l']:26);
-          case 'r' : _cimg_mp_return(reserved_label['r']!=~0U?reserved_label['r']:22);
-          case 's' : _cimg_mp_return(reserved_label['s']!=~0U?reserved_label['s']:21);
-          case 't' : _cimg_mp_return(reserved_label['t']!=~0U?reserved_label['t']:17);
-          case 'w' : _cimg_mp_return(reserved_label['w']!=~0U?reserved_label['w']:18);
-          case 'x' : _cimg_mp_return(reserved_label['x']!=~0U?reserved_label['x']:_cimg_mp_slot_x);
-          case 'y' : _cimg_mp_return(reserved_label['y']!=~0U?reserved_label['y']:_cimg_mp_slot_y);
-          case 'z' : _cimg_mp_return(reserved_label['z']!=~0U?reserved_label['z']:_cimg_mp_slot_z);
-          case 'u' :
-            if (reserved_label['u']!=~0U) _cimg_mp_return(reserved_label['u']);
-            _cimg_mp_scalar2(mp_u,0,1);
-          case 'g' :
-            if (reserved_label['g']!=~0U) _cimg_mp_return(reserved_label['g']);
-            _cimg_mp_scalar0(mp_g);
-          case 'i' :
-            if (reserved_label['i']!=~0U) _cimg_mp_return(reserved_label['i']);
-            _cimg_mp_scalar0(mp_i);
-          case 'I' :
-            _cimg_mp_op("Variable 'I'");
-            if (reserved_label['I']!=~0U) _cimg_mp_return(reserved_label['I']);
-            _cimg_mp_check_vector0(imgin._spectrum);
-            need_input_copy = true;
-            pos = vector(imgin._spectrum);
-            CImg<ulongT>::vector((ulongT)mp_Joff,pos,0,0,imgin._spectrum).move_to(code);
-            _cimg_mp_return(pos);
-          case 'R' :
-            if (reserved_label['R']!=~0U) _cimg_mp_return(reserved_label['R']);
-            need_input_copy = true;
-            _cimg_mp_scalar6(mp_ixyzc,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,0,0,0);
-          case 'G' :
-            if (reserved_label['G']!=~0U) _cimg_mp_return(reserved_label['G']);
-            need_input_copy = true;
-            _cimg_mp_scalar6(mp_ixyzc,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,1,0,0);
-          case 'B' :
-            if (reserved_label['B']!=~0U) _cimg_mp_return(reserved_label['B']);
-            need_input_copy = true;
-            _cimg_mp_scalar6(mp_ixyzc,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,2,0,0);
-          case 'A' :
-            if (reserved_label['A']!=~0U) _cimg_mp_return(reserved_label['A']);
-            need_input_copy = true;
-            _cimg_mp_scalar6(mp_ixyzc,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,3,0,0);
-          }
-        else if (ss2==se) { // Two-chars reserved variable
-          arg1 = arg2 = ~0U;
-          if (*ss=='w' && *ss1=='h') // wh
-            _cimg_mp_return(reserved_label[0]!=~0U?reserved_label[0]:23);
-          if (*ss=='p' && *ss1=='i') // pi
-            _cimg_mp_return(reserved_label[3]!=~0U?reserved_label[3]:28);
-          if (*ss=='i') {
-            if (*ss1>='0' && *ss1<='9') { // i0...i9
-              pos = 19 + *ss1 - '0';
-              if (reserved_label[pos]!=~0U) _cimg_mp_return(reserved_label[pos]);
-              need_input_copy = true;
-              _cimg_mp_scalar6(mp_ixyzc,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,pos - 19,0,0);
-            }
-            switch (*ss1) {
-            case 'm' : arg1 = 4; arg2 = 0; break; // im
-            case 'M' : arg1 = 5; arg2 = 1; break; // iM
-            case 'a' : arg1 = 6; arg2 = 2; break; // ia
-            case 'v' : arg1 = 7; arg2 = 3; break; // iv
-            case 's' : arg1 = 8; arg2 = 12; break; // is
-            case 'p' : arg1 = 9; arg2 = 13; break; // is
-            case 'c' : // ic
-              if (reserved_label[10]!=~0U) _cimg_mp_return(reserved_label[10]);
-              if (mem_img_median==~0U) mem_img_median = imgin?constant(imgin.median()):0;
-              _cimg_mp_return(mem_img_median);
-              break;
-            }
-          }
-          else if (*ss1=='m') switch (*ss) {
-            case 'x' : arg1 = 11; arg2 = 4; break; // xm
-            case 'y' : arg1 = 12; arg2 = 5; break; // ym
-            case 'z' : arg1 = 13; arg2 = 6; break; // zm
-            case 'c' : arg1 = 14; arg2 = 7; break; // cm
-            }
-          else if (*ss1=='M') switch (*ss) {
-            case 'x' : arg1 = 15; arg2 = 8; break; // xM
-            case 'y' : arg1 = 16; arg2 = 9; break; // yM
-            case 'z' : arg1 = 17; arg2 = 10; break; // zM
-            case 'c' : arg1 = 18; arg2 = 11; break; // cM
-            }
-          if (arg1!=~0U) {
-            if (reserved_label[arg1]!=~0U) _cimg_mp_return(reserved_label[arg1]);
-            if (!img_stats) {
-              img_stats.assign(1,14,1,1,0).fill(imgin.get_stats(),false);
-              mem_img_stats.assign(1,14,1,1,~0U);
-            }
-            if (mem_img_stats[arg2]==~0U) mem_img_stats[arg2] = constant(img_stats[arg2]);
-            _cimg_mp_return(mem_img_stats[arg2]);
-          }
-        } else if (ss3==se) { // Three-chars reserved variable
-          if (*ss=='w' && *ss1=='h' && *ss2=='d') // whd
-            _cimg_mp_return(reserved_label[1]!=~0U?reserved_label[1]:24);
-        } else if (ss4==se) { // Four-chars reserved variable
-          if (*ss=='w' && *ss1=='h' && *ss2=='d' && *ss3=='s') // whds
-            _cimg_mp_return(reserved_label[2]!=~0U?reserved_label[2]:25);
-        }
-
-        pos = ~0U;
-        for (s0 = ss, s = ss1; s<se1; ++s)
-          if (*s==';' && level[s - expr._data]==clevel) { // Separator ';'
-            pos = compile(s0,s++,depth,0);
-            while (*s && ((signed char)*s<=' ' || *s==';')) ++s;
-            s0 = s;
-          }
-        if (pos!=~0U) _cimg_mp_return(compile(s0,se,depth,p_ref));
-
-        // Declare / assign variable, vector value or image value.
-        for (s = ss1, ps = ss, ns = ss2; s<se1; ++s, ++ps, ++ns)
-          if (*s=='=' && *ns!='=' && *ps!='=' && *ps!='>' && *ps!='<' && *ps!='!' &&
-              *ps!='+' && *ps!='-' && *ps!='*' && *ps!='/' && *ps!='%' &&
-              *ps!='>' && *ps!='<' && *ps!='&' && *ps!='|' && *ps!='^' &&
-              level[s - expr._data]==clevel) {
-            variable_name.assign(ss,(unsigned int)(s + 1 - ss)).back() = 0;
-            cimg::strpare(variable_name,false,true);
-            const unsigned int l_variable_name = (unsigned int)std::strlen(variable_name);
-            char *const ve1 = ss + l_variable_name - 1;
-            _cimg_mp_op("Operator '='");
-
-            // Assign image value (direct).
-            if (l_variable_name>2 && (*ss=='i' || *ss=='j' || *ss=='I' || *ss=='J') && (*ss1=='(' || *ss1=='[') &&
-                (reserved_label[*ss]==~0U || *ss1=='(' || !_cimg_mp_is_vector(reserved_label[*ss]))) {
-              is_relative = *ss=='j' || *ss=='J';
-
-              if (*ss1=='[' && *ve1==']') { // i/j/I/J[_#ind,offset] = value
-                is_parallelizable = false;
-                if (*ss2=='#') { // Index specified
-                  s0 = ss3; while (s0<ve1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                  p1 = compile(ss3,s0++,depth1,0);
-                  _cimg_mp_check_list(true);
-                } else { p1 = ~0U; s0 = ss2; }
-                arg1 = compile(s0,ve1,depth1,0); // Offset
-                _cimg_mp_check_type(arg1,0,1,0);
-                arg2 = compile(s + 1,se,depth1,0); // Value to assign
-                if (_cimg_mp_is_vector(arg2)) {
-                  p2 = ~0U; // 'p2' must be the dimension of the vector-valued operand if any
-                  if (p1==~0U) p2 = imgin._spectrum;
-                  else if (_cimg_mp_is_constant(p1)) {
-                    p3 = (unsigned int)cimg::mod((int)mem[p1],listin.width());
-                    p2 = listin[p3]._spectrum;
-                  }
-                  _cimg_mp_check_vector0(p2);
-                } else p2 = 0;
-                _cimg_mp_check_type(arg2,2,*ss>='i'?1:3,p2);
-
-                if (p_ref) {
-                  *p_ref = _cimg_mp_is_vector(arg2)?4:2;
-                  p_ref[1] = p1;
-                  p_ref[2] = (unsigned int)is_relative;
-                  p_ref[3] = arg1;
-                  if (_cimg_mp_is_vector(arg2))
-                    set_variable_vector(arg2); // Prevent from being used in further optimization
-                  else if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2;
-                  if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2;
-                  if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-                }
-
-
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg2);
-                  if (*ss>='i')
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_joff:mp_list_set_ioff),
-                                        arg2,p1,arg1).move_to(code);
-                  else if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_s:mp_list_set_Ioff_s),
-                                        arg2,p1,arg1).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_v:mp_list_set_Ioff_v),
-                                        arg2,p1,arg1,_cimg_mp_vector_size(arg2)).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg2);
-                  if (*ss>='i')
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_joff:mp_set_ioff),
-                                        arg2,arg1).move_to(code);
-                  else if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_s:mp_set_Ioff_s),
-                                        arg2,arg1).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_v:mp_set_Ioff_v),
-                                        arg2,arg1,_cimg_mp_vector_size(arg2)).move_to(code);
-                }
-                _cimg_mp_return(arg2);
-              }
-
-              if (*ss1=='(' && *ve1==')') { // i/j/I/J(_#ind,_x,_y,_z,_c) = value
-                is_parallelizable = false;
-                if (*ss2=='#') { // Index specified
-                  s0 = ss3; while (s0<ve1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                  p1 = compile(ss3,s0++,depth1,0);
-                  _cimg_mp_check_list(true);
-                } else { p1 = ~0U; s0 = ss2; }
-                arg1 = is_relative?0U:(unsigned int)_cimg_mp_slot_x;
-                arg2 = is_relative?0U:(unsigned int)_cimg_mp_slot_y;
-                arg3 = is_relative?0U:(unsigned int)_cimg_mp_slot_z;
-                arg4 = is_relative?0U:(unsigned int)_cimg_mp_slot_c;
-                arg5 = compile(s + 1,se,depth1,0); // Value to assign
-                if (s0<ve1) { // X or [ X,_Y,_Z,_C ]
-                  s1 = s0; while (s1<ve1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                  arg1 = compile(s0,s1,depth1,0);
-                  if (_cimg_mp_is_vector(arg1)) { // Coordinates specified as a vector
-                    p2 = _cimg_mp_vector_size(arg1); // Vector size
-                    ++arg1;
-                    if (p2>1) {
-                      arg2 = arg1 + 1;
-                      if (p2>2) {
-                        arg3 = arg2 + 1;
-                        if (p2>3) arg4 = arg3 + 1;
-                      }
-                    }
-                  } else if (s1<ve1) { // Y
-                    s2 = ++s1; while (s2<ve1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                    arg2 = compile(s1,s2,depth1,0);
-                    if (s2<ve1) { // Z
-                      s3 = ++s2; while (s3<ve1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                      arg3 = compile(s2,s3,depth1,0);
-                      if (s3<ve1) arg4 = compile(++s3,ve1,depth1,0); // C
-                    }
-                  }
-                }
-
-                if (_cimg_mp_is_vector(arg5)) {
-                  p2 = ~0U; // 'p2' must be the dimension of the vector-valued operand if any
-                  if (p1==~0U) p2 = imgin._spectrum;
-                  else if (_cimg_mp_is_constant(p1)) {
-                    p3 = (unsigned int)cimg::mod((int)mem[p1],listin.width());
-                    p2 = listin[p3]._spectrum;
-                  }
-                  _cimg_mp_check_vector0(p2);
-                } else p2 = 0;
-                _cimg_mp_check_type(arg5,2,*ss>='i'?1:3,p2);
-
-                if (p_ref) {
-                  *p_ref = _cimg_mp_is_vector(arg5)?5:3;
-                  p_ref[1] = p1;
-                  p_ref[2] = (unsigned int)is_relative;
-                  p_ref[3] = arg1;
-                  p_ref[4] = arg2;
-                  p_ref[5] = arg3;
-                  p_ref[6] = arg4;
-                  if (_cimg_mp_is_vector(arg5))
-                    set_variable_vector(arg5); // Prevent from being used in further optimization
-                  else if (_cimg_mp_is_comp(arg5)) memtype[arg5] = -2;
-                  if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2;
-                  if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-                  if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2;
-                  if (_cimg_mp_is_comp(arg3)) memtype[arg3] = -2;
-                  if (_cimg_mp_is_comp(arg4)) memtype[arg4] = -2;
-                }
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg5);
-                  if (*ss>='i')
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_jxyzc:mp_list_set_ixyzc),
-                                        arg5,p1,arg1,arg2,arg3,arg4).move_to(code);
-                  else if (_cimg_mp_is_scalar(arg5))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_s:mp_list_set_Ixyz_s),
-                                        arg5,p1,arg1,arg2,arg3).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_v:mp_list_set_Ixyz_v),
-                                        arg5,p1,arg1,arg2,arg3,_cimg_mp_vector_size(arg5)).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg5);
-                  if (*ss>='i')
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_jxyzc:mp_set_ixyzc),
-                                        arg5,arg1,arg2,arg3,arg4).move_to(code);
-                  else if (_cimg_mp_is_scalar(arg5))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_s:mp_set_Ixyz_s),
-                                        arg5,arg1,arg2,arg3).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_v:mp_set_Ixyz_v),
-                                        arg5,arg1,arg2,arg3,_cimg_mp_vector_size(arg5)).move_to(code);
-                }
-                _cimg_mp_return(arg5);
-              }
-            }
-
-            // Assign vector value (direct).
-            if (l_variable_name>3 && *ve1==']' && *ss!='[') {
-              s0 = ve1; while (s0>ss && (*s0!='[' || level[s0 - expr._data]!=clevel)) --s0;
-              is_sth = true; // is_valid_variable_name?
-              if (*ss>='0' && *ss<='9') is_sth = false;
-              else for (ns = ss; ns<s0; ++ns)
-                     if (!is_varchar(*ns)) { is_sth = false; break; }
-              if (is_sth && s0>ss) {
-                variable_name[s0 - ss] = 0; // Remove brackets in variable name
-                arg1 = ~0U; // Vector slot
-                arg2 = compile(++s0,ve1,depth1,0); // Index
-                arg3 = compile(s + 1,se,depth1,0); // Value to assign
-                _cimg_mp_check_type(arg3,2,1,0);
-
-                if (variable_name[1]) { // Multi-char variable
-                  cimglist_for(variable_def,i) if (!std::strcmp(variable_name,variable_def[i])) {
-                    arg1 = variable_pos[i]; break;
-                  }
-                } else arg1 = reserved_label[*variable_name]; // Single-char variable
-                if (arg1==~0U) compile(ss,s0 - 1,depth1,0); // Variable does not exist -> error
-                else { // Variable already exists
-                  if (_cimg_mp_is_scalar(arg1)) compile(ss,s,depth1,0); // Variable is not a vector -> error
-                  if (_cimg_mp_is_constant(arg2)) { // Constant index -> return corresponding variable slot directly
-                    nb = (int)mem[arg2];
-                    if (nb>=0 && nb<(int)_cimg_mp_vector_size(arg1)) {
-                      arg1+=nb + 1;
-                      CImg<ulongT>::vector((ulongT)mp_copy,arg1,arg3).move_to(code);
-                      _cimg_mp_return(arg1);
-                    }
-                    compile(ss,s,depth1,0); // Out-of-bounds reference -> error
-                  }
-
-                  // Case of non-constant index -> return assigned value + linked reference
-                  if (p_ref) {
-                    *p_ref = 1;
-                    p_ref[1] = arg1;
-                    p_ref[2] = arg2;
-                    if (_cimg_mp_is_comp(arg3)) memtype[arg3] = -2; // Prevent from being used in further optimization
-                    if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2;
-                  }
-                  CImg<ulongT>::vector((ulongT)mp_vector_set_off,arg3,arg1,(ulongT)_cimg_mp_vector_size(arg1),
-                                       arg2,arg3).
-                    move_to(code);
-                  _cimg_mp_return(arg3);
-                }
-              }
-            }
-
-            // Assign user-defined macro.
-            if (l_variable_name>2 && *ve1==')' && *ss!='(') {
-              s0 = ve1; while (s0>ss && *s0!='(') --s0;
-              is_sth = std::strncmp(variable_name,"debug(",6) &&
-                std::strncmp(variable_name,"print(",6); // is_valid_function_name?
-              if (*ss>='0' && *ss<='9') is_sth = false;
-              else for (ns = ss; ns<s0; ++ns)
-                     if (!is_varchar(*ns)) { is_sth = false; break; }
-
-              if (is_sth && s0>ss) { // Looks like a valid function declaration
-                s0 = variable_name._data + (s0 - ss);
-                *s0 = 0;
-                s1 = variable_name._data + l_variable_name - 1; // Pointer to closing parenthesis
-                CImg<charT>(variable_name._data,(unsigned int)(s0 - variable_name._data + 1)).move_to(macro_def,0);
-                ++s; while (*s && (signed char)*s<=' ') ++s;
-                CImg<charT>(s,(unsigned int)(se - s + 1)).move_to(macro_body,0);
-
-                p1 = 1; // Indice of current parsed argument
-                for (s = s0 + 1; s<=s1; ++p1, s = ns + 1) { // Parse function arguments
-                  if (p1>24) {
-                    *se = saved_char;
-                    cimg::strellipsize(variable_name,64);
-                    s0 = ss - 4>expr._data?ss - 4:expr._data;
-                    cimg::strellipsize(s0,64);
-                    throw CImgArgumentException("[_cimg_math_parser] "
-                                                "CImg<%s>::%s: %s: Too much specified arguments (>24) in macro "
-                                                "definition '%s()', in expression '%s%s%s'.",
-                                                pixel_type(),_cimg_mp_calling_function,s_op,
-                                                variable_name._data,
-                                                s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-                  }
-                  while (*s && (signed char)*s<=' ') ++s;
-                  if (*s==')' && p1==1) break; // Function has no arguments
-
-                  s2 = s; // Start of the argument name
-                  is_sth = true; // is_valid_argument_name?
-                  if (*s>='0' && *s<='9') is_sth = false;
-                  else for (ns = s; ns<s1 && *ns!=',' && (signed char)*ns>' '; ++ns)
-                         if (!is_varchar(*ns)) { is_sth = false; break; }
-                  s3 = ns; // End of the argument name
-                  while (*ns && (signed char)*ns<=' ') ++ns;
-                  if (!is_sth || s2==s3 || (*ns!=',' && ns!=s1)) {
-                    *se = saved_char;
-                    cimg::strellipsize(variable_name,64);
-                    s0 = ss - 4>expr._data?ss - 4:expr._data;
-                    cimg::strellipsize(s0,64);
-                    throw CImgArgumentException("[_cimg_math_parser] "
-                                                "CImg<%s>::%s: %s: %s name specified for argument %u when defining "
-                                                "macro '%s()', in expression '%s%s%s'.",
-                                                pixel_type(),_cimg_mp_calling_function,s_op,
-                                                is_sth?"Empty":"Invalid",p1,
-                                                variable_name._data,
-                                                s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-                  }
-                  if (ns==s1 || *ns==',') { // New argument found
-                    *s3 = 0;
-                    p2 = (unsigned int)(s3 - s2); // Argument length
-                    for (ps = std::strstr(macro_body[0],s2); ps; ps = std::strstr(ps,s2)) { // Replace by arg number
-                      if (!((ps>macro_body[0]._data && is_varchar(*(ps - 1))) ||
-                            (ps + p2<macro_body[0].end() && is_varchar(*(ps + p2))))) {
-                        if (ps>macro_body[0]._data && *(ps - 1)=='#') { // Remove pre-number sign
-                          *(ps - 1) = (char)p1;
-                          if (ps + p2<macro_body[0].end() && *(ps + p2)=='#') { // Has pre & post number signs
-                            std::memmove(ps,ps + p2 + 1,macro_body[0].end() - ps - p2 - 1);
-                            macro_body[0]._width-=p2 + 1;
-                          } else { // Has pre number sign only
-                            std::memmove(ps,ps + p2,macro_body[0].end() - ps - p2);
-                            macro_body[0]._width-=p2;
-                          }
-                        } else if (ps + p2<macro_body[0].end() && *(ps + p2)=='#') { // Remove post-number sign
-                          *(ps++) = (char)p1;
-                          std::memmove(ps,ps + p2,macro_body[0].end() - ps - p2);
-                          macro_body[0]._width-=p2;
-                        } else { // Not near a number sign
-                          if (p2<3) {
-                            ps-=(ulongT)macro_body[0]._data;
-                            macro_body[0].resize(macro_body[0]._width - p2 + 3,1,1,1,0);
-                            ps+=(ulongT)macro_body[0]._data;
-                          } else macro_body[0]._width-=p2 - 3;
-                          std::memmove(ps + 3,ps + p2,macro_body[0].end() - ps - 3);
-                          *(ps++) = '(';
-                          *(ps++) = (char)p1;
-                          *(ps++) = ')';
-                        }
-                      } else ++ps;
-                    }
-                  }
-                }
-
-                // Store number of arguments.
-                macro_def[0].resize(macro_def[0]._width + 1,1,1,1,0).back() = (char)(p1 - 1);
-
-                // Detect parts of function body inside a string.
-                is_inside_string(macro_body[0]).move_to(macro_body_is_string,0);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-            }
-
-            // Check if the variable name could be valid. If not, this is probably an lvalue assignment.
-            is_sth = true; // is_valid_variable_name?
-            const bool is_const = l_variable_name>6 && !std::strncmp(variable_name,"const ",6);
-
-            s0 = variable_name._data;
-            if (is_const) {
-              s0+=6; while ((signed char)*s0<=' ') ++s0;
-              variable_name.resize(variable_name.end() - s0,1,1,1,0,0,1);
-            }
-
-            if (*variable_name>='0' && *variable_name<='9') is_sth = false;
-            else for (ns = variable_name._data; *ns; ++ns)
-                   if (!is_varchar(*ns)) { is_sth = false; break; }
-
-            // Assign variable (direct).
-            if (is_sth) {
-              arg3 = variable_name[1]?~0U:*variable_name; // One-char variable
-              if (variable_name[1] && !variable_name[2]) { // Two-chars variable
-                c1 = variable_name[0];
-                c2 = variable_name[1];
-                if (c1=='w' && c2=='h') arg3 = 0; // wh
-                else if (c1=='p' && c2=='i') arg3 = 3; // pi
-                else if (c1=='i') {
-                  if (c2>='0' && c2<='9') arg3 = 19 + c2 - '0'; // i0...i9
-                  else if (c2=='m') arg3 = 4; // im
-                  else if (c2=='M') arg3 = 5; // iM
-                  else if (c2=='a') arg3 = 6; // ia
-                  else if (c2=='v') arg3 = 7; // iv
-                  else if (c2=='s') arg3 = 8; // is
-                  else if (c2=='p') arg3 = 9; // ip
-                  else if (c2=='c') arg3 = 10; // ic
-                } else if (c2=='m') {
-                  if (c1=='x') arg3 = 11; // xm
-                  else if (c1=='y') arg3 = 12; // ym
-                  else if (c1=='z') arg3 = 13; // zm
-                  else if (c1=='c') arg3 = 14; // cm
-                } else if (c2=='M') {
-                  if (c1=='x') arg3 = 15; // xM
-                  else if (c1=='y') arg3 = 16; // yM
-                  else if (c1=='z') arg3 = 17; // zM
-                  else if (c1=='c') arg3 = 18; // cM
-                }
-              } else if (variable_name[1] && variable_name[2] && !variable_name[3]) { // Three-chars variable
-                c1 = variable_name[0];
-                c2 = variable_name[1];
-                c3 = variable_name[2];
-                if (c1=='w' && c2=='h' && c3=='d') arg3 = 1; // whd
-              } else if (variable_name[1] && variable_name[2] && variable_name[3] &&
-                         !variable_name[4]) { // Four-chars variable
-                c1 = variable_name[0];
-                c2 = variable_name[1];
-                c3 = variable_name[2];
-                c4 = variable_name[3];
-                if (c1=='w' && c2=='h' && c3=='d' && c4=='s') arg3 = 2; // whds
-              } else if (!std::strcmp(variable_name,"interpolation")) arg3 = 29; // interpolation
-              else if (!std::strcmp(variable_name,"boundary")) arg3 = 30; // boundary
-
-              arg1 = ~0U;
-              arg2 = compile(s + 1,se,depth1,0);
-              if (is_const) _cimg_mp_check_constant(arg2,2,0);
-
-              if (arg3!=~0U) // One-char variable, or variable in reserved_labels
-                arg1 = reserved_label[arg3];
-              else // Multi-char variable name : check for existing variable with same name
-                cimglist_for(variable_def,i)
-                  if (!std::strcmp(variable_name,variable_def[i])) { arg1 = variable_pos[i]; break; }
-
-              if (arg1==~0U) { // Create new variable
-                if (_cimg_mp_is_vector(arg2)) { // Vector variable
-                  arg1 = is_comp_vector(arg2)?arg2:vector_copy(arg2);
-                  set_variable_vector(arg1);
-                } else { // Scalar variable
-                  if (is_const) arg1 = arg2;
-                  else {
-                    arg1 = _cimg_mp_is_comp(arg2)?arg2:scalar1(mp_copy,arg2);
-                    memtype[arg1] = -1;
-                  }
-                }
-
-                if (arg3!=~0U) reserved_label[arg3] = arg1;
-                else {
-                  if (variable_def._width>=variable_pos._width) variable_pos.resize(-200,1,1,1,0);
-                  variable_pos[variable_def._width] = arg1;
-                  variable_name.move_to(variable_def);
-                }
-
-              } else { // Variable already exists -> assign a new value
-                if (is_const || _cimg_mp_is_constant(arg1)) {
-                  *se = saved_char;
-                  cimg::strellipsize(variable_name,64);
-                  s0 = ss - 4>expr._data?ss - 4:expr._data;
-                  cimg::strellipsize(s0,64);
-                  throw CImgArgumentException("[_cimg_math_parser] "
-                                              "CImg<%s>::%s: %s: Invalid assignment of %sconst variable '%s'%s, "
-                                              "in expression '%s%s%s'.",
-                                              pixel_type(),_cimg_mp_calling_function,s_op,
-                                              _cimg_mp_is_constant(arg1)?"already-defined ":"non-",
-                                              variable_name._data,
-                                              !_cimg_mp_is_constant(arg1) && is_const?" as a new const variable":"",
-                                              s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-                }
-                _cimg_mp_check_type(arg2,2,_cimg_mp_is_vector(arg1)?3:1,_cimg_mp_vector_size(arg1));
-                if (_cimg_mp_is_vector(arg1)) { // Vector
-                  if (_cimg_mp_is_vector(arg2)) // From vector
-                    CImg<ulongT>::vector((ulongT)mp_vector_copy,arg1,arg2,(ulongT)_cimg_mp_vector_size(arg1)).
-                      move_to(code);
-                  else // From scalar
-                    CImg<ulongT>::vector((ulongT)mp_vector_init,arg1,1,(ulongT)_cimg_mp_vector_size(arg1),arg2).
-                      move_to(code);
-                } else // Scalar
-                  CImg<ulongT>::vector((ulongT)mp_copy,arg1,arg2).move_to(code);
-              }
-              _cimg_mp_return(arg1);
-            }
-
-            // Assign lvalue (variable name was not valid for a direct assignment).
-            arg1 = ~0U;
-            is_sth = (bool)std::strchr(variable_name,'?'); // Contains_ternary_operator?
-            if (is_sth) break; // Do nothing and make ternary operator prioritary over assignment
-
-            if (l_variable_name>2 && (std::strchr(variable_name,'(') || std::strchr(variable_name,'['))) {
-              ref.assign(7);
-              arg1 = compile(ss,s,depth1,ref); // Lvalue slot
-              arg2 = compile(s + 1,se,depth1,0); // Value to assign
-
-              if (*ref==1) { // Vector value (scalar): V[k] = scalar
-                _cimg_mp_check_type(arg2,2,1,0);
-                arg3 = ref[1]; // Vector slot
-                arg4 = ref[2]; // Index
-                if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-                CImg<ulongT>::vector((ulongT)mp_vector_set_off,arg2,arg3,(ulongT)_cimg_mp_vector_size(arg3),arg4,arg2).
-                  move_to(code);
-                _cimg_mp_return(arg2);
-              }
-
-              if (*ref==2) { // Image value (scalar): i/j[_#ind,off] = scalar
-                is_parallelizable = false;
-                _cimg_mp_check_type(arg2,2,1,0);
-                p1 = ref[1]; // Index
-                is_relative = (bool)ref[2];
-                arg3 = ref[3]; // Offset
-                if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg2);
-                  CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_joff:mp_list_set_ioff),
-                                      arg2,p1,arg3).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg2);
-                  CImg<ulongT>::vector((ulongT)(is_relative?mp_set_joff:mp_set_ioff),
-                                      arg2,arg3).move_to(code);
-                }
-                _cimg_mp_return(arg2);
-              }
-
-              if (*ref==3) { // Image value (scalar): i/j(_#ind,_x,_y,_z,_c) = scalar
-                is_parallelizable = false;
-                _cimg_mp_check_type(arg2,2,1,0);
-                p1 = ref[1]; // Index
-                is_relative = (bool)ref[2];
-                arg3 = ref[3]; // X
-                arg4 = ref[4]; // Y
-                arg5 = ref[5]; // Z
-                arg6 = ref[6]; // C
-                if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg2);
-                  CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_jxyzc:mp_list_set_ixyzc),
-                                      arg2,p1,arg3,arg4,arg5,arg6).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg2);
-                  CImg<ulongT>::vector((ulongT)(is_relative?mp_set_jxyzc:mp_set_ixyzc),
-                                      arg2,arg3,arg4,arg5,arg6).move_to(code);
-                }
-                _cimg_mp_return(arg2);
-              }
-
-              if (*ref==4) { // Image value (vector): I/J[_#ind,off] = value
-                is_parallelizable = false;
-                _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-                p1 = ref[1]; // Index
-                is_relative = (bool)ref[2];
-                arg3 = ref[3]; // Offset
-                if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg2);
-                  if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_s:mp_list_set_Ioff_s),
-                                        arg2,p1,arg3).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_v:mp_list_set_Ioff_v),
-                                        arg2,p1,arg3,_cimg_mp_vector_size(arg2)).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg2);
-                  if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_s:mp_set_Ioff_s),
-                                        arg2,arg3).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_v:mp_set_Ioff_v),
-                                        arg2,arg3,_cimg_mp_vector_size(arg2)).move_to(code);
-                }
-                _cimg_mp_return(arg2);
-              }
-
-              if (*ref==5) { // Image value (vector): I/J(_#ind,_x,_y,_z,_c) = value
-                is_parallelizable = false;
-                _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-                p1 = ref[1]; // Index
-                is_relative = (bool)ref[2];
-                arg3 = ref[3]; // X
-                arg4 = ref[4]; // Y
-                arg5 = ref[5]; // Z
-                if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-                if (p1!=~0U) {
-                  if (!listout) _cimg_mp_return(arg2);
-                  if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_s:mp_list_set_Ixyz_s),
-                                        arg2,p1,arg3,arg4,arg5).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_v:mp_list_set_Ixyz_v),
-                                        arg2,p1,arg3,arg4,arg5,_cimg_mp_vector_size(arg2)).move_to(code);
-                } else {
-                  if (!imgout) _cimg_mp_return(arg2);
-                  if (_cimg_mp_is_scalar(arg2))
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_s:mp_set_Ixyz_s),
-                                        arg2,arg3,arg4,arg5).move_to(code);
-                  else
-                    CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_v:mp_set_Ixyz_v),
-                                        arg2,arg3,arg4,arg5,_cimg_mp_vector_size(arg2)).move_to(code);
-                }
-                _cimg_mp_return(arg2);
-              }
-
-              if (_cimg_mp_is_vector(arg1)) { // Vector variable: V = value
-                _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-                if (_cimg_mp_is_vector(arg2)) // From vector
-                  CImg<ulongT>::vector((ulongT)mp_vector_copy,arg1,arg2,(ulongT)_cimg_mp_vector_size(arg1)).
-                    move_to(code);
-                else // From scalar
-                  CImg<ulongT>::vector((ulongT)mp_vector_init,arg1,1,(ulongT)_cimg_mp_vector_size(arg1),arg2).
-                    move_to(code);
-                _cimg_mp_return(arg1);
-              }
-
-              if (_cimg_mp_is_variable(arg1)) { // Scalar variable: s = scalar
-                _cimg_mp_check_type(arg2,2,1,0);
-                CImg<ulongT>::vector((ulongT)mp_copy,arg1,arg2).move_to(code);
-                _cimg_mp_return(arg1);
-              }
-            }
-
-            // No assignment expressions match -> error
-            *se = saved_char;
-            cimg::strellipsize(variable_name,64);
-            s0 = ss - 4>expr._data?ss - 4:expr._data;
-            cimg::strellipsize(s0,64);
-            throw CImgArgumentException("[_cimg_math_parser] "
-                                        "CImg<%s>::%s: %s: Invalid %slvalue '%s', "
-                                        "in expression '%s%s%s'.",
-                                        pixel_type(),_cimg_mp_calling_function,s_op,
-                                        arg1!=~0U && _cimg_mp_is_constant(arg1)?"const ":"",
-                                        variable_name._data,
-                                        s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-          }
-
-        // Apply unary/binary/ternary operators. The operator precedences should be the same as in C++.
-        for (s = se2, ps = se3, ns = ps - 1; s>ss1; --s, --ps, --ns) // Here, ns = ps - 1
-          if (*s=='=' && (*ps=='*' || *ps=='/' || *ps=='^') && *ns==*ps &&
-              level[s - expr._data]==clevel) { // Self-operators for complex numbers only (**=,//=,^^=)
-            _cimg_mp_op(*ps=='*'?"Operator '**='":*ps=='/'?"Operator '//='":"Operator '^^='");
-
-            ref.assign(7);
-            arg1 = compile(ss,ns,depth1,ref); // Vector slot
-            arg2 = compile(s + 1,se,depth1,0); // Right operand
-            _cimg_mp_check_type(arg1,1,2,2);
-            _cimg_mp_check_type(arg2,2,3,2);
-            if (_cimg_mp_is_vector(arg2)) { // Complex **= complex
-              if (*ps=='*')
-                CImg<ulongT>::vector((ulongT)mp_complex_mul,arg1,arg1,arg2).move_to(code);
-              else if (*ps=='/')
-                CImg<ulongT>::vector((ulongT)mp_complex_div_vv,arg1,arg1,arg2).move_to(code);
-              else
-                CImg<ulongT>::vector((ulongT)mp_complex_pow_vv,arg1,arg1,arg2).move_to(code);
-            } else { // Complex **= scalar
-              if (*ps=='*') {
-                if (arg2==1) _cimg_mp_return(arg1);
-                self_vector_s(arg1,mp_self_mul,arg2);
-              } else if (*ps=='/') {
-                if (arg2==1) _cimg_mp_return(arg1);
-                self_vector_s(arg1,mp_self_div,arg2);
-              } else {
-                if (arg2==1) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)mp_complex_pow_vs,arg1,arg1,arg2).move_to(code);
-              }
-            }
-
-            // Write computed value back in image if necessary.
-            if (*ref==4) { // Image value (vector): I/J[_#ind,off] **= value
-              is_parallelizable = false;
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // Offset
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_v:mp_list_set_Ioff_v),
-                                    arg1,p1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_v:mp_set_Ioff_v),
-                                    arg1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-              }
-
-            } else if (*ref==5) { // Image value (vector): I/J(_#ind,_x,_y,_z,_c) **= value
-              is_parallelizable = false;
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // X
-              arg4 = ref[4]; // Y
-              arg5 = ref[5]; // Z
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_v:mp_list_set_Ixyz_v),
-                                    arg1,p1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_v:mp_set_Ixyz_v),
-                                    arg1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-              }
-            }
-
-            _cimg_mp_return(arg1);
-          }
-
-        for (s = se2, ps = se3, ns = ps - 1; s>ss1; --s, --ps, --ns) // Here, ns = ps - 1
-          if (*s=='=' && (*ps=='+' || *ps=='-' || *ps=='*' || *ps=='/' || *ps=='%' ||
-                          *ps=='&' || *ps=='^' || *ps=='|' ||
-                          (*ps=='>' && *ns=='>') || (*ps=='<' && *ns=='<')) &&
-              level[s - expr._data]==clevel) { // Self-operators (+=,-=,*=,/=,%=,>>=,<<=,&=,^=,|=)
-            switch (*ps) {
-            case '+' : op = mp_self_add; _cimg_mp_op("Operator '+='"); break;
-            case '-' : op = mp_self_sub; _cimg_mp_op("Operator '-='"); break;
-            case '*' : op = mp_self_mul; _cimg_mp_op("Operator '*='"); break;
-            case '/' : op = mp_self_div; _cimg_mp_op("Operator '/='"); break;
-            case '%' : op = mp_self_modulo; _cimg_mp_op("Operator '%='"); break;
-            case '<' : op = mp_self_bitwise_left_shift; _cimg_mp_op("Operator '<<='"); break;
-            case '>' : op = mp_self_bitwise_right_shift; _cimg_mp_op("Operator '>>='"); break;
-            case '&' : op = mp_self_bitwise_and; _cimg_mp_op("Operator '&='"); break;
-            case '|' : op = mp_self_bitwise_or; _cimg_mp_op("Operator '|='"); break;
-            default : op = mp_self_pow; _cimg_mp_op("Operator '^='"); break;
-            }
-            s1 = *ps=='>' || *ps=='<'?ns:ps;
-
-            ref.assign(7);
-            arg1 = compile(ss,s1,depth1,ref); // Variable slot
-            arg2 = compile(s + 1,se,depth1,0); // Value to apply
-
-            // Check for particular case to be simplified.
-            if ((op==mp_self_add || op==mp_self_sub) && !arg2) _cimg_mp_return(arg1);
-            if ((op==mp_self_mul || op==mp_self_div) && arg2==1) _cimg_mp_return(arg1);
-
-            // Apply operator on a copy to prevent modifying a constant or a variable.
-            if (*ref && (_cimg_mp_is_constant(arg1) || _cimg_mp_is_vector(arg1) || _cimg_mp_is_variable(arg1))) {
-              if (_cimg_mp_is_vector(arg1)) arg1 = vector_copy(arg1);
-              else arg1 = scalar1(mp_copy,arg1);
-            }
-
-            if (*ref==1) { // Vector value (scalar): V[k] += scalar
-              _cimg_mp_check_type(arg2,2,1,0);
-              arg3 = ref[1]; // Vector slot
-              arg4 = ref[2]; // Index
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              CImg<ulongT>::vector((ulongT)op,arg1,arg2).move_to(code);
-              CImg<ulongT>::vector((ulongT)mp_vector_set_off,arg1,arg3,(ulongT)_cimg_mp_vector_size(arg3),arg4,arg1).
-                move_to(code);
-              _cimg_mp_return(arg1);
-            }
-
-            if (*ref==2) { // Image value (scalar): i/j[_#ind,off] += scalar
-              is_parallelizable = false;
-              _cimg_mp_check_type(arg2,2,1,0);
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // Offset
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              CImg<ulongT>::vector((ulongT)op,arg1,arg2).move_to(code);
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_joff:mp_list_set_ioff),
-                                    arg1,p1,arg3).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_joff:mp_set_ioff),
-                                    arg1,arg3).move_to(code);
-              }
-              _cimg_mp_return(arg1);
-            }
-
-            if (*ref==3) { // Image value (scalar): i/j(_#ind,_x,_y,_z,_c) += scalar
-              is_parallelizable = false;
-              _cimg_mp_check_type(arg2,2,1,0);
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // X
-              arg4 = ref[4]; // Y
-              arg5 = ref[5]; // Z
-              arg6 = ref[6]; // C
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              CImg<ulongT>::vector((ulongT)op,arg1,arg2).move_to(code);
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_jxyzc:mp_list_set_ixyzc),
-                                    arg1,p1,arg3,arg4,arg5,arg6).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_jxyzc:mp_set_ixyzc),
-                                    arg1,arg3,arg4,arg5,arg6).move_to(code);
-              }
-              _cimg_mp_return(arg1);
-            }
-
-            if (*ref==4) { // Image value (vector): I/J[_#ind,off] += value
-              is_parallelizable = false;
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // Offset
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              if (_cimg_mp_is_scalar(arg2)) self_vector_s(arg1,op,arg2); else self_vector_v(arg1,op,arg2);
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_v:mp_list_set_Ioff_v),
-                                    arg1,p1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_v:mp_set_Ioff_v),
-                                    arg1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-              }
-              _cimg_mp_return(arg1);
-            }
-
-            if (*ref==5) { // Image value (vector): I/J(_#ind,_x,_y,_z,_c) += value
-              is_parallelizable = false;
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              p1 = ref[1]; // Index
-              is_relative = (bool)ref[2];
-              arg3 = ref[3]; // X
-              arg4 = ref[4]; // Y
-              arg5 = ref[5]; // Z
-              if (p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-              if (_cimg_mp_is_scalar(arg2)) self_vector_s(arg1,op,arg2); else self_vector_v(arg1,op,arg2);
-              if (p1!=~0U) {
-                if (!listout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_v:mp_list_set_Ixyz_v),
-                                    arg1,p1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-              } else {
-                if (!imgout) _cimg_mp_return(arg1);
-                CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_v:mp_set_Ixyz_v),
-                                    arg1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-              }
-              _cimg_mp_return(arg1);
-            }
-
-            if (_cimg_mp_is_vector(arg1)) { // Vector variable: V += value
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              if (_cimg_mp_is_vector(arg2)) self_vector_v(arg1,op,arg2); // Vector += vector
-              else self_vector_s(arg1,op,arg2); // Vector += scalar
-              _cimg_mp_return(arg1);
-            }
-
-            if (_cimg_mp_is_variable(arg1)) { // Scalar variable: s += scalar
-              _cimg_mp_check_type(arg2,2,1,0);
-              CImg<ulongT>::vector((ulongT)op,arg1,arg2).move_to(code);
-              _cimg_mp_return(arg1);
-            }
-
-            variable_name.assign(ss,(unsigned int)(s - ss)).back() = 0;
-            cimg::strpare(variable_name,false,true);
-            *se = saved_char;
-            s0 = ss - 4>expr._data?ss - 4:expr._data;
-            cimg::strellipsize(s0,64);
-            throw CImgArgumentException("[_cimg_math_parser] "
-                                        "CImg<%s>::%s: %s: Invalid %slvalue '%s', "
-                                        "in expression '%s%s%s'.",
-                                        pixel_type(),_cimg_mp_calling_function,s_op,
-                                        _cimg_mp_is_constant(arg1)?"const ":"",
-                                        variable_name._data,
-                                        s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-          }
-
-        for (s = ss1; s<se1; ++s)
-          if (*s=='?' && level[s - expr._data]==clevel) { // Ternary operator 'cond?expr1:expr2'
-            _cimg_mp_op("Operator '?:'");
-            s1 = s + 1; while (s1<se1 && (*s1!=':' || level[s1 - expr._data]!=clevel)) ++s1;
-            arg1 = compile(ss,s,depth1,0);
-            _cimg_mp_check_type(arg1,1,1,0);
-            if (_cimg_mp_is_constant(arg1)) {
-              if ((bool)mem[arg1]) return compile(s + 1,*s1!=':'?se:s1,depth1,0);
-              else return *s1!=':'?0:compile(++s1,se,depth1,0);
-            }
-            p2 = code._width;
-            arg2 = compile(s + 1,*s1!=':'?se:s1,depth1,0);
-            p3 = code._width;
-            arg3 = *s1==':'?compile(++s1,se,depth1,0):_cimg_mp_is_vector(arg2)?vector(_cimg_mp_vector_size(arg2),0):0;
-            _cimg_mp_check_type(arg3,3,_cimg_mp_is_vector(arg2)?2:1,_cimg_mp_vector_size(arg2));
-            arg4 = _cimg_mp_vector_size(arg2);
-            if (arg4) pos = vector(arg4); else pos = scalar();
-            CImg<ulongT>::vector((ulongT)mp_if,pos,arg1,arg2,arg3,
-                                p3 - p2,code._width - p3,arg4).move_to(code,p2);
-            _cimg_mp_return(pos);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='|' && *ns=='|' && level[s - expr._data]==clevel) { // Logical or ('||')
-            _cimg_mp_op("Operator '||'");
-            arg1 = compile(ss,s,depth1,0);
-            _cimg_mp_check_type(arg1,1,1,0);
-            if (arg1>0 && arg1<=16) _cimg_mp_return(1);
-            p2 = code._width;
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,1,0);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant(mem[arg1] || mem[arg2]);
-            if (!arg1) _cimg_mp_return(arg2);
-            pos = scalar();
-            CImg<ulongT>::vector((ulongT)mp_logical_or,pos,arg1,arg2,code._width - p2).
-              move_to(code,p2);
-            _cimg_mp_return(pos);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='&' && *ns=='&' && level[s - expr._data]==clevel) { // Logical and ('&&')
-            _cimg_mp_op("Operator '&&'");
-            arg1 = compile(ss,s,depth1,0);
-            _cimg_mp_check_type(arg1,1,1,0);
-            if (!arg1) _cimg_mp_return(0);
-            p2 = code._width;
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,1,0);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant(mem[arg1] && mem[arg2]);
-            if (arg1>0 && arg1<=16) _cimg_mp_return(arg2);
-            pos = scalar();
-            CImg<ulongT>::vector((ulongT)mp_logical_and,pos,arg1,arg2,code._width - p2).
-              move_to(code,p2);
-            _cimg_mp_return(pos);
-          }
-
-        for (s = se2; s>ss; --s)
-          if (*s=='|' && level[s - expr._data]==clevel) { // Bitwise or ('|')
-            _cimg_mp_op("Operator '|'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_bitwise_or,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) {
-              if (!arg2) _cimg_mp_return(arg1);
-              _cimg_mp_vector2_vs(mp_bitwise_or,arg1,arg2);
-            }
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) {
-              if (!arg1) _cimg_mp_return(arg2);
-              _cimg_mp_vector2_sv(mp_bitwise_or,arg1,arg2);
-            }
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant((longT)mem[arg1] | (longT)mem[arg2]);
-            if (!arg2) _cimg_mp_return(arg1);
-            if (!arg1) _cimg_mp_return(arg2);
-            _cimg_mp_scalar2(mp_bitwise_or,arg1,arg2);
-          }
-
-        for (s = se2; s>ss; --s)
-          if (*s=='&' && level[s - expr._data]==clevel) { // Bitwise and ('&')
-            _cimg_mp_op("Operator '&'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_bitwise_and,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_bitwise_and,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_bitwise_and,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant((longT)mem[arg1] & (longT)mem[arg2]);
-            if (!arg1 || !arg2) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_bitwise_and,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='!' && *ns=='=' && level[s - expr._data]==clevel) { // Not equal to ('!=')
-            _cimg_mp_op("Operator '!='");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            if (arg1==arg2) _cimg_mp_return(0);
-            p1 = _cimg_mp_vector_size(arg1);
-            p2 = _cimg_mp_vector_size(arg2);
-            if (p1 || p2) {
-              if (p1 && p2 && p1!=p2) _cimg_mp_return(1);
-              _cimg_mp_scalar6(mp_vector_neq,arg1,p1,arg2,p2,11,1);
-            }
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]!=mem[arg2]);
-            _cimg_mp_scalar2(mp_neq,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='=' && *ns=='=' && level[s - expr._data]==clevel) { // Equal to ('==')
-            _cimg_mp_op("Operator '=='");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            if (arg1==arg2) _cimg_mp_return(1);
-            p1 = _cimg_mp_vector_size(arg1);
-            p2 = _cimg_mp_vector_size(arg2);
-            if (p1 || p2) {
-              if (p1 && p2 && p1!=p2) _cimg_mp_return(0);
-              _cimg_mp_scalar6(mp_vector_eq,arg1,p1,arg2,p2,11,1);
-            }
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]==mem[arg2]);
-            _cimg_mp_scalar2(mp_eq,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='<' && *ns=='=' && level[s - expr._data]==clevel) { // Less or equal than ('<=')
-            _cimg_mp_op("Operator '<='");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_lte,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_lte,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_lte,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]<=mem[arg2]);
-            if (arg1==arg2) _cimg_mp_return(1);
-            _cimg_mp_scalar2(mp_lte,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='>' && *ns=='=' && level[s - expr._data]==clevel) { // Greater or equal than ('>=')
-            _cimg_mp_op("Operator '>='");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_gte,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_gte,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_gte,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]>=mem[arg2]);
-            if (arg1==arg2) _cimg_mp_return(1);
-            _cimg_mp_scalar2(mp_gte,arg1,arg2);
-          }
-
-        for (s = se2, ns = se1, ps = se3; s>ss; --s, --ns, --ps)
-          if (*s=='<' && *ns!='<' && *ps!='<' && level[s - expr._data]==clevel) { // Less than ('<')
-            _cimg_mp_op("Operator '<'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_lt,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_lt,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_lt,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]<mem[arg2]);
-            if (arg1==arg2) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_lt,arg1,arg2);
-          }
-
-        for (s = se2, ns = se1, ps = se3; s>ss; --s, --ns, --ps)
-          if (*s=='>' && *ns!='>' && *ps!='>' && level[s - expr._data]==clevel) { // Greather than ('>')
-            _cimg_mp_op("Operator '>'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_gt,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_gt,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_gt,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]>mem[arg2]);
-            if (arg1==arg2) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_gt,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='<' && *ns=='<' && level[s - expr._data]==clevel) { // Left bit shift ('<<')
-            _cimg_mp_op("Operator '<<'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2))
-              _cimg_mp_vector2_vv(mp_bitwise_left_shift,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) {
-              if (!arg2) _cimg_mp_return(arg1);
-              _cimg_mp_vector2_vs(mp_bitwise_left_shift,arg1,arg2);
-            }
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2))
-              _cimg_mp_vector2_sv(mp_bitwise_left_shift,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant((longT)mem[arg1]<<(unsigned int)mem[arg2]);
-            if (!arg1) _cimg_mp_return(0);
-            if (!arg2) _cimg_mp_return(arg1);
-            _cimg_mp_scalar2(mp_bitwise_left_shift,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='>' && *ns=='>' && level[s - expr._data]==clevel) { // Right bit shift ('>>')
-            _cimg_mp_op("Operator '>>'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2))
-              _cimg_mp_vector2_vv(mp_bitwise_right_shift,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) {
-              if (!arg2) _cimg_mp_return(arg1);
-              _cimg_mp_vector2_vs(mp_bitwise_right_shift,arg1,arg2);
-            }
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2))
-              _cimg_mp_vector2_sv(mp_bitwise_right_shift,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant((longT)mem[arg1]>>(unsigned int)mem[arg2]);
-            if (!arg1) _cimg_mp_return(0);
-            if (!arg2) _cimg_mp_return(arg1);
-            _cimg_mp_scalar2(mp_bitwise_right_shift,arg1,arg2);
-          }
-
-        for (ns = se1, s = se2, ps = pexpr._data + (se3 - expr._data); s>ss; --ns, --s, --ps)
-          if (*s=='+' && (*ns!='+' || ns!=se1) && *ps!='-' && *ps!='+' && *ps!='*' && *ps!='/' && *ps!='%' &&
-              *ps!='&' && *ps!='|' && *ps!='^' && *ps!='!' && *ps!='~' && *ps!='#' &&
-              (*ps!='e' || !(ps - pexpr._data>ss - expr._data && (*(ps - 1)=='.' || (*(ps - 1)>='0' &&
-                                                                                     *(ps - 1)<='9')))) &&
-              level[s - expr._data]==clevel) { // Addition ('+')
-            _cimg_mp_op("Operator '+'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (!arg2) _cimg_mp_return(arg1);
-            if (!arg1) _cimg_mp_return(arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_add,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_add,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_add,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1] + mem[arg2]);
-            if (code) { // Try to spot linear case 'a*b + c'.
-              CImg<ulongT> &pop = code.back();
-              if (pop[0]==(ulongT)mp_mul && _cimg_mp_is_comp(pop[1]) && (pop[1]==arg1 || pop[1]==arg2)) {
-                arg3 = (unsigned int)pop[1];
-                arg4 = (unsigned int)pop[2];
-                arg5 = (unsigned int)pop[3];
-                code.remove();
-                CImg<ulongT>::vector((ulongT)mp_linear_add,arg3,arg4,arg5,arg3==arg2?arg1:arg2).move_to(code);
-                _cimg_mp_return(arg3);
-              }
-            }
-            if (arg2==1) _cimg_mp_scalar1(mp_increment,arg1);
-            if (arg1==1) _cimg_mp_scalar1(mp_increment,arg2);
-            _cimg_mp_scalar2(mp_add,arg1,arg2);
-          }
-
-        for (ns = se1, s = se2, ps = pexpr._data + (se3 - expr._data); s>ss; --ns, --s, --ps)
-          if (*s=='-' && (*ns!='-' || ns!=se1) && *ps!='-' && *ps!='+' && *ps!='*' && *ps!='/' && *ps!='%' &&
-              *ps!='&' && *ps!='|' && *ps!='^' && *ps!='!' && *ps!='~' && *ps!='#' &&
-              (*ps!='e' || !(ps - pexpr._data>ss - expr._data && (*(ps - 1)=='.' || (*(ps - 1)>='0' &&
-                                                                                     *(ps - 1)<='9')))) &&
-              level[s - expr._data]==clevel) { // Subtraction ('-')
-            _cimg_mp_op("Operator '-'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (!arg2) _cimg_mp_return(arg1);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_sub,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_sub,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) {
-              if (!arg1) _cimg_mp_vector1_v(mp_minus,arg2);
-              _cimg_mp_vector2_sv(mp_sub,arg1,arg2);
-            }
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1] - mem[arg2]);
-            if (!arg1) _cimg_mp_scalar1(mp_minus,arg2);
-            if (code) { // Try to spot linear cases 'a*b - c' and 'c - a*b'.
-              CImg<ulongT> &pop = code.back();
-              if (pop[0]==(ulongT)mp_mul && _cimg_mp_is_comp(pop[1]) && (pop[1]==arg1 || pop[1]==arg2)) {
-                arg3 = (unsigned int)pop[1];
-                arg4 = (unsigned int)pop[2];
-                arg5 = (unsigned int)pop[3];
-                code.remove();
-                CImg<ulongT>::vector((ulongT)(arg3==arg1?mp_linear_sub_left:mp_linear_sub_right),
-                                     arg3,arg4,arg5,arg3==arg1?arg2:arg1).move_to(code);
-                _cimg_mp_return(arg3);
-              }
-            }
-            if (arg2==1) _cimg_mp_scalar1(mp_decrement,arg1);
-            _cimg_mp_scalar2(mp_sub,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='*' && *ns=='*' && level[s - expr._data]==clevel) { // Complex multiplication ('**')
-            _cimg_mp_op("Operator '**'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg1,1,3,2);
-            _cimg_mp_check_type(arg2,2,3,2);
-            if (arg2==1) _cimg_mp_return(arg1);
-            if (arg1==1) _cimg_mp_return(arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) {
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_mul,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_mul,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_mul,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]*mem[arg2]);
-            if (!arg1 || !arg2) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_mul,arg1,arg2);
-          }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='/' && *ns=='/' && level[s - expr._data]==clevel) { // Complex division ('//')
-            _cimg_mp_op("Operator '//'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg1,1,3,2);
-            _cimg_mp_check_type(arg2,2,3,2);
-            if (arg2==1) _cimg_mp_return(arg1);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) {
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_div_vv,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_div,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) {
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_div_sv,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]/mem[arg2]);
-            if (!arg1) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_div,arg1,arg2);
-          }
-
-        for (s = se2; s>ss; --s) if (*s=='*' && level[s - expr._data]==clevel) { // Multiplication ('*')
-            _cimg_mp_op("Operator '*'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            p2 = _cimg_mp_vector_size(arg2);
-            if (p2>0 && _cimg_mp_vector_size(arg1)==p2*p2) { // Particular case of matrix multiplication
-              pos = vector(p2);
-              CImg<ulongT>::vector((ulongT)mp_matrix_mul,pos,arg1,arg2,p2,p2,1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (arg2==1) _cimg_mp_return(arg1);
-            if (arg1==1) _cimg_mp_return(arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_mul,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_mul,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_mul,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]*mem[arg2]);
-
-            if (code) { // Try to spot double multiplication 'a*b*c'.
-              CImg<ulongT> &pop = code.back();
-              if (pop[0]==(ulongT)mp_mul && _cimg_mp_is_comp(pop[1]) && (pop[1]==arg1 || pop[1]==arg2)) {
-                arg3 = (unsigned int)pop[1];
-                arg4 = (unsigned int)pop[2];
-                arg5 = (unsigned int)pop[3];
-                code.remove();
-                CImg<ulongT>::vector((ulongT)mp_mul2,arg3,arg4,arg5,arg3==arg2?arg1:arg2).move_to(code);
-                _cimg_mp_return(arg3);
-              }
-            }
-            if (!arg1 || !arg2) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_mul,arg1,arg2);
-          }
-
-        for (s = se2; s>ss; --s) if (*s=='/' && level[s - expr._data]==clevel) { // Division ('/')
-            _cimg_mp_op("Operator '/'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (arg2==1) _cimg_mp_return(arg1);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_div,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_div,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_div,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) _cimg_mp_constant(mem[arg1]/mem[arg2]);
-            if (!arg1) _cimg_mp_return(0);
-            _cimg_mp_scalar2(mp_div,arg1,arg2);
-          }
-
-        for (s = se2, ns = se1; s>ss; --s, --ns)
-          if (*s=='%' && *ns!='^' && level[s - expr._data]==clevel) { // Modulo ('%')
-            _cimg_mp_op("Operator '%'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_modulo,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_modulo,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_modulo,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant(cimg::mod(mem[arg1],mem[arg2]));
-            _cimg_mp_scalar2(mp_modulo,arg1,arg2);
-          }
-
-        if (se1>ss) {
-          if (*ss=='+' && (*ss1!='+' || (ss2<se && *ss2>='0' && *ss2<='9'))) { // Unary plus ('+')
-            _cimg_mp_op("Operator '+'");
-            _cimg_mp_return(compile(ss1,se,depth1,0));
-          }
-
-          if (*ss=='-' && (*ss1!='-' || (ss2<se && *ss2>='0' && *ss2<='9'))) { // Unary minus ('-')
-            _cimg_mp_op("Operator '-'");
-            arg1 = compile(ss1,se,depth1,0);
-            if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_minus,arg1);
-            if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(-mem[arg1]);
-            _cimg_mp_scalar1(mp_minus,arg1);
-          }
-
-          if (*ss=='!') { // Logical not ('!')
-            _cimg_mp_op("Operator '!'");
-            if (*ss1=='!') { // '!!expr' optimized as 'bool(expr)'
-              arg1 = compile(ss2,se,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_bool,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant((bool)mem[arg1]);
-              _cimg_mp_scalar1(mp_bool,arg1);
-            }
-            arg1 = compile(ss1,se,depth1,0);
-            if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_logical_not,arg1);
-            if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(!mem[arg1]);
-            _cimg_mp_scalar1(mp_logical_not,arg1);
-          }
-
-          if (*ss=='~') { // Bitwise not ('~')
-            _cimg_mp_op("Operator '~'");
-            arg1 = compile(ss1,se,depth1,0);
-            if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_bitwise_not,arg1);
-            if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(~(unsigned int)mem[arg1]);
-            _cimg_mp_scalar1(mp_bitwise_not,arg1);
-          }
-        }
-
-        for (s = se3, ns = se2; s>ss; --s, --ns)
-          if (*s=='^' && *ns=='^' && level[s - expr._data]==clevel) { // Complex power ('^^')
-            _cimg_mp_op("Operator '^^'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 2,se,depth1,0);
-            _cimg_mp_check_type(arg1,1,3,2);
-            _cimg_mp_check_type(arg2,2,3,2);
-            if (arg2==1) _cimg_mp_return(arg1);
-            pos = vector(2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) {
-              CImg<ulongT>::vector((ulongT)mp_complex_pow_vv,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) {
-              CImg<ulongT>::vector((ulongT)mp_complex_pow_vs,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) {
-              CImg<ulongT>::vector((ulongT)mp_complex_pow_sv,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            CImg<ulongT>::vector((ulongT)mp_complex_pow_ss,pos,arg1,arg2).move_to(code);
-            _cimg_mp_return(pos);
-          }
-
-        for (s = se2; s>ss; --s)
-          if (*s=='^' && level[s - expr._data]==clevel) { // Power ('^')
-            _cimg_mp_op("Operator '^'");
-            arg1 = compile(ss,s,depth1,0);
-            arg2 = compile(s + 1,se,depth1,0);
-            _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-            if (arg2==1) _cimg_mp_return(arg1);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_pow,arg1,arg2);
-            if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_pow,arg1,arg2);
-            if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_pow,arg1,arg2);
-            if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-              _cimg_mp_constant(std::pow(mem[arg1],mem[arg2]));
-            switch (arg2) {
-            case 0 : _cimg_mp_return(1);
-            case 2 : _cimg_mp_scalar1(mp_sqr,arg1);
-            case 3 : _cimg_mp_scalar1(mp_pow3,arg1);
-            case 4 : _cimg_mp_scalar1(mp_pow4,arg1);
-            default :
-              if (_cimg_mp_is_constant(arg2)) {
-                if (mem[arg2]==0.5) { _cimg_mp_scalar1(mp_sqrt,arg1); }
-                else if (mem[arg2]==0.25) { _cimg_mp_scalar1(mp_pow0_25,arg1); }
-              }
-              _cimg_mp_scalar2(mp_pow,arg1,arg2);
-            }
-          }
-
-        // Percentage computation.
-        if (*se1=='%') {
-          arg1 = compile(ss,se1,depth1,0);
-          arg2 = _cimg_mp_is_constant(arg1)?0:constant(100);
-          if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector2_vs(mp_div,arg1,arg2);
-          if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(mem[arg1]/100);
-          _cimg_mp_scalar2(mp_div,arg1,arg2);
-        }
-
-        is_sth = ss1<se1 && (*ss=='+' || *ss=='-') && *ss1==*ss; // is pre-?
-        if (is_sth || (se2>ss && (*se1=='+' || *se1=='-') && *se2==*se1)) { // Pre/post-decrement and increment
-          if ((is_sth && *ss=='+') || (!is_sth && *se1=='+')) {
-            _cimg_mp_op("Operator '++'");
-            op = mp_self_increment;
-          } else {
-            _cimg_mp_op("Operator '--'");
-            op = mp_self_decrement;
-          }
-          ref.assign(7);
-          arg1 = is_sth?compile(ss2,se,depth1,ref):compile(ss,se2,depth1,ref); // Variable slot
-
-          // Apply operator on a copy to prevent modifying a constant or a variable.
-          if (*ref && (_cimg_mp_is_constant(arg1) || _cimg_mp_is_vector(arg1) || _cimg_mp_is_variable(arg1))) {
-            if (_cimg_mp_is_vector(arg1)) arg1 = vector_copy(arg1);
-            else arg1 = scalar1(mp_copy,arg1);
-          }
-
-          if (is_sth) pos = arg1; // Determine return indice, depending on pre/post action
-          else {
-            if (_cimg_mp_is_vector(arg1)) pos = vector_copy(arg1);
-            else pos = scalar1(mp_copy,arg1);
-          }
-
-          if (*ref==1) { // Vector value (scalar): V[k]++
-            arg3 = ref[1]; // Vector slot
-            arg4 = ref[2]; // Index
-            if (is_sth && p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-            CImg<ulongT>::vector((ulongT)op,arg1,1).move_to(code);
-            CImg<ulongT>::vector((ulongT)mp_vector_set_off,arg1,arg3,(ulongT)_cimg_mp_vector_size(arg3),arg4,arg1).
-              move_to(code);
-            _cimg_mp_return(pos);
-          }
-
-          if (*ref==2) { // Image value (scalar): i/j[_#ind,off]++
-            is_parallelizable = false;
-            p1 = ref[1]; // Index
-            is_relative = (bool)ref[2];
-            arg3 = ref[3]; // Offset
-            if (is_sth && p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-            CImg<ulongT>::vector((ulongT)op,arg1).move_to(code);
-            if (p1!=~0U) {
-              if (!listout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_joff:mp_list_set_ioff),
-                                  arg1,p1,arg3).move_to(code);
-            } else {
-              if (!imgout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_set_joff:mp_set_ioff),
-                                  arg1,arg3).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          if (*ref==3) { // Image value (scalar): i/j(_#ind,_x,_y,_z,_c)++
-            is_parallelizable = false;
-            p1 = ref[1]; // Index
-            is_relative = (bool)ref[2];
-            arg3 = ref[3]; // X
-            arg4 = ref[4]; // Y
-            arg5 = ref[5]; // Z
-            arg6 = ref[6]; // C
-            if (is_sth && p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-            CImg<ulongT>::vector((ulongT)op,arg1).move_to(code);
-            if (p1!=~0U) {
-              if (!listout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_jxyzc:mp_list_set_ixyzc),
-                                  arg1,p1,arg3,arg4,arg5,arg6).move_to(code);
-            } else {
-              if (!imgout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_set_jxyzc:mp_set_ixyzc),
-                                  arg1,arg3,arg4,arg5,arg6).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          if (*ref==4) { // Image value (vector): I/J[_#ind,off]++
-            is_parallelizable = false;
-            p1 = ref[1]; // Index
-            is_relative = (bool)ref[2];
-            arg3 = ref[3]; // Offset
-            if (is_sth && p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-            self_vector_s(arg1,op==mp_self_increment?mp_self_add:mp_self_sub,1);
-            if (p1!=~0U) {
-              if (!listout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Joff_v:mp_list_set_Ioff_v),
-                                  arg1,p1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-            } else {
-              if (!imgout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Joff_v:mp_set_Ioff_v),
-                                  arg1,arg3,_cimg_mp_vector_size(arg1)).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          if (*ref==5) { // Image value (vector): I/J(_#ind,_x,_y,_z,_c)++
-            is_parallelizable = false;
-            p1 = ref[1]; // Index
-            is_relative = (bool)ref[2];
-            arg3 = ref[3]; // X
-            arg4 = ref[4]; // Y
-            arg5 = ref[5]; // Z
-            if (is_sth && p_ref) std::memcpy(p_ref,ref,ref._width*sizeof(unsigned int));
-            self_vector_s(arg1,op==mp_self_increment?mp_self_add:mp_self_sub,1);
-            if (p1!=~0U) {
-              if (!listout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_set_Jxyz_v:mp_list_set_Ixyz_v),
-                                  arg1,p1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-            } else {
-              if (!imgout) _cimg_mp_return(pos);
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_set_Jxyz_v:mp_set_Ixyz_v),
-                                  arg1,arg3,arg4,arg5,_cimg_mp_vector_size(arg1)).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          if (_cimg_mp_is_vector(arg1)) { // Vector variable: V++
-            self_vector_s(arg1,op==mp_self_increment?mp_self_add:mp_self_sub,1);
-            _cimg_mp_return(pos);
-          }
-
-          if (_cimg_mp_is_variable(arg1)) { // Scalar variable: s++
-            CImg<ulongT>::vector((ulongT)op,arg1).move_to(code);
-            _cimg_mp_return(pos);
-          }
-
-          if (is_sth) variable_name.assign(ss2,(unsigned int)(se - ss1));
-          else variable_name.assign(ss,(unsigned int)(se1 - ss));
-          variable_name.back() = 0;
-          cimg::strpare(variable_name,false,true);
-          *se = saved_char;
-          cimg::strellipsize(variable_name,64);
-          s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s: Invalid %slvalue '%s', "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,
-                                      _cimg_mp_is_constant(arg1)?"const ":"",
-                                      variable_name._data,
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-
-        // Array-like access to vectors and  image values 'i/j/I/J[_#ind,offset,_boundary]' and 'vector[offset]'.
-        if (*se1==']' && *ss!='[') {
-          _cimg_mp_op("Value accessor '[]'");
-          is_relative = *ss=='j' || *ss=='J';
-          s0 = s1 = std::strchr(ss,'['); do { --s1; } while ((signed char)*s1<=' '); cimg::swap(*s0,*++s1);
-
-          if ((*ss=='I' || *ss=='J') && *ss1=='[' &&
-              (reserved_label[*ss]==~0U || !_cimg_mp_is_vector(reserved_label[*ss]))) { // Image value as a vector
-            if (*ss2=='#') { // Index specified
-              s0 = ss3; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-              p1 = compile(ss3,s0++,depth1,0);
-              _cimg_mp_check_list(false);
-            } else { p1 = ~0U; s0 = ss2; }
-            s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-            p2 = 1 + (p1!=~0U);
-            arg1 = compile(s0,s1,depth1,0); // Offset
-            _cimg_mp_check_type(arg1,p2,1,0);
-            arg2 = ~0U;
-            if (s1<se1) {
-              arg2 = compile(++s1,se1,depth1,0); // Boundary
-              _cimg_mp_check_type(arg2,p2 + 1,1,0);
-            }
-            if (p_ref && arg2==~0U) {
-              *p_ref = 4;
-              p_ref[1] = p1;
-              p_ref[2] = (unsigned int)is_relative;
-              p_ref[3] = arg1;
-              if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2; // Prevent from being used in further optimization
-              if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-            }
-            p2 = ~0U; // 'p2' must be the dimension of the vector-valued operand if any
-            if (p1==~0U) p2 = imgin._spectrum;
-            else if (_cimg_mp_is_constant(p1)) {
-              p3 = (unsigned int)cimg::mod((int)mem[p1],listin.width());
-              p2 = listin[p3]._spectrum;
-            }
-            _cimg_mp_check_vector0(p2);
-            pos = vector(p2);
-            if (p1!=~0U) {
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_Joff:mp_list_Ioff),
-                                  pos,p1,arg1,arg2==~0U?_cimg_mp_boundary:arg2,p2).move_to(code);
-            } else {
-              need_input_copy = true;
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_Joff:mp_Ioff),
-                                  pos,arg1,arg2==~0U?_cimg_mp_boundary:arg2,p2).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          if ((*ss=='i' || *ss=='j') && *ss1=='[' &&
-              (reserved_label[*ss]==~0U || !_cimg_mp_is_vector(reserved_label[*ss]))) { // Image value as a scalar
-            if (*ss2=='#') { // Index specified
-              s0 = ss3; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-              p1 = compile(ss3,s0++,depth1,0);
-            } else { p1 = ~0U; s0 = ss2; }
-            s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-            arg1 = compile(s0,s1,depth1,0); // Offset
-            arg2 = s1<se1?compile(++s1,se1,depth1,0):~0U; // Boundary
-            if (p_ref && arg2==~0U) {
-              *p_ref = 2;
-              p_ref[1] = p1;
-              p_ref[2] = (unsigned int)is_relative;
-              p_ref[3] = arg1;
-              if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2; // Prevent from being used in further optimization
-              if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-            }
-            if (p1!=~0U) {
-              if (!listin) _cimg_mp_return(0);
-              pos = scalar3(is_relative?mp_list_joff:mp_list_ioff,p1,arg1,arg2==~0U?_cimg_mp_boundary:arg2);
-            } else {
-              if (!imgin) _cimg_mp_return(0);
-              need_input_copy = true;
-              pos = scalar2(is_relative?mp_joff:mp_ioff,arg1,arg2==~0U?_cimg_mp_boundary:arg2);
-            }
-            memtype[pos] = -2; // Prevent from being used in further optimization
-            _cimg_mp_return(pos);
-          }
-
-          s0 = se1; while (s0>ss && (*s0!='[' || level[s0 - expr._data]!=clevel)) --s0;
-          if (s0>ss) { // Vector value
-            arg1 = compile(ss,s0,depth1,0);
-            if (_cimg_mp_is_scalar(arg1)) {
-              variable_name.assign(ss,(unsigned int)(s0 - ss + 1)).back() = 0;
-              *se = saved_char;
-              cimg::strellipsize(variable_name,64);
-              s0 = ss - 4>expr._data?ss - 4:expr._data;
-              cimg::strellipsize(s0,64);
-              throw CImgArgumentException("[_cimg_math_parser] "
-                                          "CImg<%s>::%s: %s: Array brackets used on non-vector variable '%s', "
-                                          "in expression '%s%s%s'.",
-                                          pixel_type(),_cimg_mp_calling_function,s_op,
-                                          variable_name._data,
-                                          s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-
-            }
-            s1 = s0 + 1; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-
-            if (s1<se1) { // Two arguments -> sub-vector extraction
-              p1 = _cimg_mp_vector_size(arg1);
-              arg2 = compile(++s0,s1,depth1,0); // Starting indice
-              arg3 = compile(++s1,se1,depth1,0); // Length
-              _cimg_mp_check_constant(arg3,2,3);
-              arg3 = (unsigned int)mem[arg3];
-              pos = vector(arg3);
-              CImg<ulongT>::vector((ulongT)mp_vector_crop,pos,arg1,p1,arg2,arg3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            // One argument -> vector value reference
-            arg2 = compile(++s0,se1,depth1,0);
-            if (_cimg_mp_is_constant(arg2)) { // Constant index
-              nb = (int)mem[arg2];
-              if (nb>=0 && nb<(int)_cimg_mp_vector_size(arg1)) _cimg_mp_return(arg1 + 1 + nb);
-              variable_name.assign(ss,(unsigned int)(s0 - ss)).back() = 0;
-              *se = saved_char;
-              cimg::strellipsize(variable_name,64);
-              s0 = ss - 4>expr._data?ss - 4:expr._data;
-              cimg::strellipsize(s0,64);
-              throw CImgArgumentException("[_cimg_math_parser] "
-                                          "CImg<%s>::%s: Out-of-bounds reference '%s[%d]' "
-                                          "(vector '%s' has dimension %u), "
-                                          "in expression '%s%s%s'.",
-                                          pixel_type(),_cimg_mp_calling_function,
-                                          variable_name._data,nb,
-                                          variable_name._data,_cimg_mp_vector_size(arg1),
-                                          s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-            }
-            if (p_ref) {
-              *p_ref = 1;
-              p_ref[1] = arg1;
-              p_ref[2] = arg2;
-              if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2; // Prevent from being used in further optimization
-            }
-            pos = scalar3(mp_vector_off,arg1,_cimg_mp_vector_size(arg1),arg2);
-            memtype[pos] = -2; // Prevent from being used in further optimization
-            _cimg_mp_return(pos);
-          }
-        }
-
-        // Look for a function call, an access to image value, or a parenthesis.
-        if (*se1==')') {
-          if (*ss=='(') _cimg_mp_return(compile(ss1,se1,depth1,p_ref)); // Simple parentheses
-          _cimg_mp_op("Value accessor '()'");
-          is_relative = *ss=='j' || *ss=='J';
-          s0 = s1 = std::strchr(ss,'('); do { --s1; } while ((signed char)*s1<=' '); cimg::swap(*s0,*++s1);
-
-          // I/J(_#ind,_x,_y,_z,_interpolation,_boundary_conditions)
-          if ((*ss=='I' || *ss=='J') && *ss1=='(') { // Image value as scalar
-            if (*ss2=='#') { // Index specified
-              s0 = ss3; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-              p1 = compile(ss3,s0++,depth1,0);
-              _cimg_mp_check_list(false);
-            } else { p1 = ~0U; s0 = ss2; }
-            arg1 = is_relative?0U:(unsigned int)_cimg_mp_slot_x;
-            arg2 = is_relative?0U:(unsigned int)_cimg_mp_slot_y;
-            arg3 = is_relative?0U:(unsigned int)_cimg_mp_slot_z;
-            arg4 = arg5 = ~0U;
-            if (s0<se1) {
-              s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(s0,s1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) { // Coordinates specified as a vector
-                p2 = _cimg_mp_vector_size(arg1);
-                ++arg1;
-                if (p2>1) {
-                  arg2 = arg1 + 1;
-                  if (p2>2) arg3 = arg2 + 1;
-                }
-                if (s1<se1) {
-                  s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                  arg4 = compile(s1,s2,depth1,0);
-                  arg5 = s2<se1?compile(++s2,se1,depth1,0):~0U;
-                }
-              } else if (s1<se1) {
-                s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                arg2 = compile(s1,s2,depth1,0);
-                if (s2<se1) {
-                  s3 = ++s2; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                  arg3 = compile(s2,s3,depth1,0);
-                  if (s3<se1) {
-                    s2 = ++s3; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                    arg4 = compile(s3,s2,depth1,0);
-                    arg5 = s2<se1?compile(++s2,se1,depth1,0):~0U;
-                  }
-                }
-              }
-            }
-            if (p_ref && arg4==~0U && arg5==~0U) {
-              *p_ref = 5;
-              p_ref[1] = p1;
-              p_ref[2] = (unsigned int)is_relative;
-              p_ref[3] = arg1;
-              p_ref[4] = arg2;
-              p_ref[5] = arg3;
-              if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2; // Prevent from being used in further optimization
-              if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-              if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2;
-              if (_cimg_mp_is_comp(arg3)) memtype[arg3] = -2;
-            }
-            p2 = ~0U; // 'p2' must be the dimension of the vector-valued operand if any
-            if (p1==~0U) p2 = imgin._spectrum;
-            else if (_cimg_mp_is_constant(p1)) {
-              p3 = (unsigned int)cimg::mod((int)mem[p1],listin.width());
-              p2 = listin[p3]._spectrum;
-            }
-            _cimg_mp_check_vector0(p2);
-            pos = vector(p2);
-            if (p1!=~0U)
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_list_Jxyz:mp_list_Ixyz),
-                                   pos,p1,arg1,arg2,arg3,
-                                   arg4==~0U?_cimg_mp_interpolation:arg4,
-                                   arg5==~0U?_cimg_mp_boundary:arg5,p2).move_to(code);
-            else {
-              need_input_copy = true;
-              CImg<ulongT>::vector((ulongT)(is_relative?mp_Jxyz:mp_Ixyz),
-                                  pos,arg1,arg2,arg3,
-                                  arg4==~0U?_cimg_mp_interpolation:arg4,
-                                  arg5==~0U?_cimg_mp_boundary:arg5,p2).move_to(code);
-            }
-            _cimg_mp_return(pos);
-          }
-
-          // i/j(_#ind,_x,_y,_z,_c,_interpolation,_boundary_conditions)
-          if ((*ss=='i' || *ss=='j') && *ss1=='(') { // Image value as scalar
-            if (*ss2=='#') { // Index specified
-              s0 = ss3; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-              p1 = compile(ss3,s0++,depth1,0);
-            } else { p1 = ~0U; s0 = ss2; }
-            arg1 = is_relative?0U:(unsigned int)_cimg_mp_slot_x;
-            arg2 = is_relative?0U:(unsigned int)_cimg_mp_slot_y;
-            arg3 = is_relative?0U:(unsigned int)_cimg_mp_slot_z;
-            arg4 = is_relative?0U:(unsigned int)_cimg_mp_slot_c;
-            arg5 = arg6 = ~0U;
-            if (s0<se1) {
-              s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(s0,s1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) { // Coordinates specified as a vector
-                p2 = _cimg_mp_vector_size(arg1);
-                ++arg1;
-                if (p2>1) {
-                  arg2 = arg1 + 1;
-                  if (p2>2) {
-                    arg3 = arg2 + 1;
-                    if (p2>3) arg4 = arg3 + 1;
-                  }
-                }
-                if (s1<se1) {
-                  s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                  arg5 = compile(s1,s2,depth1,0);
-                  arg6 = s2<se1?compile(++s2,se1,depth1,0):~0U;
-                }
-              } else if (s1<se1) {
-                s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                arg2 = compile(s1,s2,depth1,0);
-                if (s2<se1) {
-                  s3 = ++s2; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                  arg3 = compile(s2,s3,depth1,0);
-                  if (s3<se1) {
-                    s2 = ++s3; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                    arg4 = compile(s3,s2,depth1,0);
-                    if (s2<se1) {
-                      s3 = ++s2; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                      arg5 = compile(s2,s3,depth1,0);
-                      arg6 = s3<se1?compile(++s3,se1,depth1,0):~0U;
-                    }
-                  }
-                }
-              }
-            }
-            if (p_ref && arg5==~0U && arg6==~0U) {
-              *p_ref = 3;
-              p_ref[1] = p1;
-              p_ref[2] = (unsigned int)is_relative;
-              p_ref[3] = arg1;
-              p_ref[4] = arg2;
-              p_ref[5] = arg3;
-              p_ref[6] = arg4;
-              if (p1!=~0U && _cimg_mp_is_comp(p1)) memtype[p1] = -2; // Prevent from being used in further optimization
-              if (_cimg_mp_is_comp(arg1)) memtype[arg1] = -2;
-              if (_cimg_mp_is_comp(arg2)) memtype[arg2] = -2;
-              if (_cimg_mp_is_comp(arg3)) memtype[arg3] = -2;
-              if (_cimg_mp_is_comp(arg4)) memtype[arg4] = -2;
-            }
-
-            if (p1!=~0U) {
-              if (!listin) _cimg_mp_return(0);
-              pos = scalar7(is_relative?mp_list_jxyzc:mp_list_ixyzc,
-                            p1,arg1,arg2,arg3,arg4,
-                            arg5==~0U?_cimg_mp_interpolation:arg5,
-                            arg6==~0U?_cimg_mp_boundary:arg6);
-            } else {
-              if (!imgin) _cimg_mp_return(0);
-              need_input_copy = true;
-              pos = scalar6(is_relative?mp_jxyzc:mp_ixyzc,
-                            arg1,arg2,arg3,arg4,
-                            arg5==~0U?_cimg_mp_interpolation:arg5,
-                            arg6==~0U?_cimg_mp_boundary:arg6);
-            }
-            memtype[pos] = -2; // Prevent from being used in further optimization
-            _cimg_mp_return(pos);
-          }
-
-          // Mathematical functions.
-          switch (*ss) {
-
-          case '_' :
-            if (*ss1=='(') // Skip arguments
-              _cimg_mp_return(_cimg_mp_slot_nan);
-            break;
-
-          case 'a' :
-            if (!std::strncmp(ss,"abs(",4)) { // Absolute value
-              _cimg_mp_op("Function 'abs()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_abs,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::abs(mem[arg1]));
-              _cimg_mp_scalar1(mp_abs,arg1);
-            }
-
-            if (!std::strncmp(ss,"acos(",5)) { // Arccos
-              _cimg_mp_op("Function 'acos()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_acos,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::acos(mem[arg1]));
-              _cimg_mp_scalar1(mp_acos,arg1);
-            }
-
-            if (!std::strncmp(ss,"arg(",4)) { // Nth argument
-              _cimg_mp_op("Function 'arg()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              _cimg_mp_check_type(arg1,1,1,0);
-              s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(s1,s2,depth1,0);
-              p2 = _cimg_mp_vector_size(arg2);
-              p3 = 3;
-              CImg<ulongT>::vector((ulongT)mp_arg,0,0,p2,arg1,arg2).move_to(_opcode);
-              for (s = ++s2; s<se; ++s) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                arg3 = compile(s,ns,depth1,0);
-                _cimg_mp_check_type(arg3,p3,p2?2:1,p2);
-                CImg<ulongT>::vector(arg3).move_to(_opcode);
-                ++p3;
-                s = ns;
-              }
-              (_opcode>'y').move_to(opcode);
-              opcode[2] = opcode._height;
-              if (_cimg_mp_is_constant(arg1)) {
-                p3-=1; // Number of args
-                arg1 = (unsigned int)(mem[arg1]<0?mem[arg1] + p3:mem[arg1]);
-                if (arg1<p3) _cimg_mp_return(opcode[4 + arg1]);
-                if (p2) {
-                  pos = vector(p2);
-                  std::memset(&mem[pos] + 1,0,p2*sizeof(double));
-                  _cimg_mp_return(pos);
-                } else _cimg_mp_return(0);
-              }
-              pos = opcode[1] = p2?vector(p2):scalar();
-              opcode.move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"asin(",5)) { // Arcsin
-              _cimg_mp_op("Function 'asin()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_asin,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::asin(mem[arg1]));
-              _cimg_mp_scalar1(mp_asin,arg1);
-            }
-
-            if (!std::strncmp(ss,"atan(",5)) { // Arctan
-              _cimg_mp_op("Function 'atan()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_atan,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::atan(mem[arg1]));
-              _cimg_mp_scalar1(mp_atan,arg1);
-            }
-
-            if (!std::strncmp(ss,"atan2(",6)) { // Arctan2
-              _cimg_mp_op("Function 'atan2()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss6,s1,depth1,0);
-              arg2 = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_atan2,arg1,arg2);
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_atan2,arg1,arg2);
-              if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_atan2,arg1,arg2);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-                _cimg_mp_constant(std::atan2(mem[arg1],mem[arg2]));
-              _cimg_mp_scalar2(mp_atan2,arg1,arg2);
-            }
-            break;
-
-          case 'b' :
-            if (!std::strncmp(ss,"bool(",5)) { // Boolean cast
-              _cimg_mp_op("Function 'bool()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_bool,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant((bool)mem[arg1]);
-              _cimg_mp_scalar1(mp_bool,arg1);
-            }
-
-            if (!std::strncmp(ss,"break(",6)) { // Complex absolute value
-              if (pexpr[se2 - expr._data]=='(') { // no arguments?
-                CImg<ulongT>::vector((ulongT)mp_break,_cimg_mp_slot_nan).move_to(code);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-            }
-
-            if (!std::strncmp(ss,"breakpoint(",11)) { // Break point (for abort test)
-              _cimg_mp_op("Function 'breakpoint()'");
-              if (pexpr[se2 - expr._data]=='(') { // no arguments?
-                CImg<ulongT>::vector((ulongT)mp_breakpoint,_cimg_mp_slot_nan).move_to(code);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-            }
-            break;
-
-          case 'c' :
-            if (!std::strncmp(ss,"cabs(",5)) { // Complex absolute value
-              _cimg_mp_op("Function 'cabs()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_check_type(arg1,0,2,2);
-              _cimg_mp_scalar2(mp_complex_abs,arg1 + 1,arg1 + 2);
-            }
-
-            if (!std::strncmp(ss,"carg(",5)) { // Complex argument
-              _cimg_mp_op("Function 'carg()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_check_type(arg1,0,2,2);
-              _cimg_mp_scalar2(mp_atan2,arg1 + 2,arg1 + 1);
-            }
-
-            if (!std::strncmp(ss,"cbrt(",5)) { // Cubic root
-              _cimg_mp_op("Function 'cbrt()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_cbrt,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::cbrt(mem[arg1]));
-              _cimg_mp_scalar1(mp_cbrt,arg1);
-            }
-
-            if (!std::strncmp(ss,"cconj(",6)) { // Complex conjugate
-              _cimg_mp_op("Function 'cconj()'");
-              arg1 = compile(ss6,se1,depth1,0);
-              _cimg_mp_check_type(arg1,0,2,2);
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_conj,pos,arg1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"cexp(",5)) { // Complex exponential
-              _cimg_mp_op("Function 'cexp()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_check_type(arg1,0,2,2);
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_exp,pos,arg1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"clog(",5)) { // Complex logarithm
-              _cimg_mp_op("Function 'clog()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_check_type(arg1,0,2,2);
-              pos = vector(2);
-              CImg<ulongT>::vector((ulongT)mp_complex_log,pos,arg1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"continue(",9)) { // Complex absolute value
-              if (pexpr[se2 - expr._data]=='(') { // no arguments?
-                CImg<ulongT>::vector((ulongT)mp_continue,_cimg_mp_slot_nan).move_to(code);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-            }
-
-            if (!std::strncmp(ss,"copy(",5)) { // Memory copy
-              _cimg_mp_op("Function 'copy()'");
-              ref.assign(14);
-              s1 = ss5; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = p1 = compile(ss5,s1,depth1,ref);
-              s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(s1,s2,depth1,ref._data + 7);
-              arg3 = ~0U; arg4 = arg5 = arg6 = 1;
-              if (s2<se1) {
-                s3 = ++s2; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                arg3 = compile(s2,s3,depth1,0);
-                if (s3<se1) {
-                  s1 = ++s3; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                  arg4 = compile(s3,s1,depth1,0);
-                  if (s1<se1) {
-                    s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                    arg5 = compile(s1,s2,depth1,0);
-                    arg6 = s2<se1?compile(++s2,se1,depth1,0):1;
-                  }
-                }
-              }
-              if (_cimg_mp_is_vector(arg1) && !ref[0]) ++arg1;
-              if (_cimg_mp_is_vector(arg2)) {
-                if (arg3==~0U) arg3 = _cimg_mp_vector_size(arg2);
-                if (!ref[7]) ++arg2;
-              }
-              if (arg3==~0U) arg3 = 1;
-              _cimg_mp_check_type(arg3,3,1,0);
-              _cimg_mp_check_type(arg4,4,1,0);
-              _cimg_mp_check_type(arg5,5,1,0);
-              _cimg_mp_check_type(arg6,5,1,0);
-              CImg<ulongT>(1,22).move_to(code);
-              code.back().get_shared_rows(0,7).fill((ulongT)mp_memcopy,p1,arg1,arg2,arg3,arg4,arg5,arg6);
-              code.back().get_shared_rows(8,21).fill(ref);
-              _cimg_mp_return(p1);
-            }
-
-            if (!std::strncmp(ss,"cos(",4)) { // Cosine
-              _cimg_mp_op("Function 'cos()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_cos,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::cos(mem[arg1]));
-              _cimg_mp_scalar1(mp_cos,arg1);
-            }
-
-            if (!std::strncmp(ss,"cosh(",5)) { // Hyperbolic cosine
-              _cimg_mp_op("Function 'cosh()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_cosh,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::cosh(mem[arg1]));
-              _cimg_mp_scalar1(mp_cosh,arg1);
-            }
-
-            if (!std::strncmp(ss,"crop(",5)) { // Image crop
-              _cimg_mp_op("Function 'crop()'");
-              if (*ss5=='#') { // Index specified
-                s0 = ss6; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                p1 = compile(ss6,s0++,depth1,0);
-                _cimg_mp_check_list(false);
-              } else { p1 = ~0U; s0 = ss5; need_input_copy = true; }
-              pos = 0;
-              is_sth = false; // Coordinates specified as a vector?
-              if (ss5<se1) for (s = s0; s<se; ++s, ++pos) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                arg1 = compile(s,ns,depth1,0);
-                if (!pos && _cimg_mp_is_vector(arg1)) { // Coordinates specified as a vector
-                  opcode = CImg<ulongT>::sequence(_cimg_mp_vector_size(arg1),arg1 + 1,
-                                                  arg1 + (ulongT)_cimg_mp_vector_size(arg1));
-                  opcode.resize(1,std::min(opcode._height,4U),1,1,0).move_to(_opcode);
-                  is_sth = true;
-                } else {
-                  _cimg_mp_check_type(arg1,pos + 1,1,0);
-                  CImg<ulongT>::vector(arg1).move_to(_opcode);
-                }
-                s = ns;
-              }
-              (_opcode>'y').move_to(opcode);
-
-              arg1 = 0; arg2 = (p1!=~0U);
-              switch (opcode._height) {
-              case 0 : case 1 :
-                CImg<ulongT>::vector(0,0,0,0,~0U,~0U,~0U,~0U,0).move_to(opcode);
-                break;
-              case 2 :
-                CImg<ulongT>::vector(*opcode,0,0,0,opcode[1],~0U,~0U,~0U,_cimg_mp_boundary).move_to(opcode);
-                arg1 = arg2?3:2;
-                break;
-              case 3 :
-                CImg<ulongT>::vector(*opcode,0,0,0,opcode[1],~0U,~0U,~0U,opcode[2]).move_to(opcode);
-                arg1 = arg2?3:2;
-                break;
-              case 4 :
-                CImg<ulongT>::vector(*opcode,opcode[1],0,0,opcode[2],opcode[3],~0U,~0U,_cimg_mp_boundary).
-                  move_to(opcode);
-                arg1 = (is_sth?2:1) + arg2;
-                break;
-              case 5 :
-                CImg<ulongT>::vector(*opcode,opcode[1],0,0,opcode[2],opcode[3],~0U,~0U,opcode[4]).
-                  move_to(opcode);
-                arg1 = (is_sth?2:1) + arg2;
-                break;
-              case 6 :
-                CImg<ulongT>::vector(*opcode,opcode[1],opcode[2],0,opcode[3],opcode[4],opcode[5],~0U,
-                                    _cimg_mp_boundary).move_to(opcode);
-                arg1 = (is_sth?2:4) + arg2;
-                break;
-              case 7 :
-                CImg<ulongT>::vector(*opcode,opcode[1],opcode[2],0,opcode[3],opcode[4],opcode[5],~0U,
-                                    opcode[6]).move_to(opcode);
-                arg1 = (is_sth?2:4) + arg2;
-                break;
-              case 8 :
-                CImg<ulongT>::vector(*opcode,opcode[1],opcode[2],opcode[3],opcode[4],opcode[5],opcode[6],
-                                    opcode[7],_cimg_mp_boundary).move_to(opcode);
-                arg1 = (is_sth?2:5) + arg2;
-                break;
-              case 9 :
-                arg1 = (is_sth?2:5) + arg2;
-                break;
-              default : // Error -> too much arguments
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Too much arguments specified, "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-
-              _cimg_mp_check_type((unsigned int)*opcode,arg2 + 1,1,0);
-              _cimg_mp_check_type((unsigned int)opcode[1],arg2 + 1 + (is_sth?0:1),1,0);
-              _cimg_mp_check_type((unsigned int)opcode[2],arg2 + 1 + (is_sth?0:2),1,0);
-              _cimg_mp_check_type((unsigned int)opcode[3],arg2 + 1 + (is_sth?0:3),1,0);
-              if (opcode[4]!=(ulongT)~0U) {
-                _cimg_mp_check_constant((unsigned int)opcode[4],arg1,3);
-                opcode[4] = (ulongT)mem[opcode[4]];
-              }
-              if (opcode[5]!=(ulongT)~0U) {
-                _cimg_mp_check_constant((unsigned int)opcode[5],arg1 + 1,3);
-                opcode[5] = (ulongT)mem[opcode[5]];
-              }
-              if (opcode[6]!=(ulongT)~0U) {
-                _cimg_mp_check_constant((unsigned int)opcode[6],arg1 + 2,3);
-                opcode[6] = (ulongT)mem[opcode[6]];
-              }
-              if (opcode[7]!=(ulongT)~0U) {
-                _cimg_mp_check_constant((unsigned int)opcode[7],arg1 + 3,3);
-                opcode[7] = (ulongT)mem[opcode[7]];
-              }
-              _cimg_mp_check_type((unsigned int)opcode[8],arg1 + 4,1,0);
-
-              if (opcode[4]==(ulongT)~0U || opcode[5]==(ulongT)~0U ||
-                  opcode[6]==(ulongT)~0U || opcode[7]==(ulongT)~0U) {
-                if (p1!=~0U) {
-                  _cimg_mp_check_constant(p1,1,1);
-                  p1 = (unsigned int)cimg::mod((int)mem[p1],listin.width());
-                }
-                const CImg<T> &img = p1!=~0U?listin[p1]:imgin;
-                if (!img) {
-                  *se = saved_char;
-                  s0 = ss - 4>expr._data?ss - 4:expr._data;
-                  cimg::strellipsize(s0,64);
-                  throw CImgArgumentException("[_cimg_math_parser] "
-                                              "CImg<%s>::%s: %s: Cannot crop empty image when "
-                                              "some xyzc-coordinates are unspecified, in expression '%s%s%s'.",
-                                              pixel_type(),_cimg_mp_calling_function,s_op,
-                                              s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-                }
-                if (opcode[4]==(ulongT)~0U) opcode[4] = (ulongT)img._width;
-                if (opcode[5]==(ulongT)~0U) opcode[5] = (ulongT)img._height;
-                if (opcode[6]==(ulongT)~0U) opcode[6] = (ulongT)img._depth;
-                if (opcode[7]==(ulongT)~0U) opcode[7] = (ulongT)img._spectrum;
-              }
-
-              pos = vector((unsigned int)(opcode[4]*opcode[5]*opcode[6]*opcode[7]));
-              CImg<ulongT>::vector((ulongT)mp_image_crop,
-                                  pos,p1,
-                                  *opcode,opcode[1],opcode[2],opcode[3],
-                                  opcode[4],opcode[5],opcode[6],opcode[7],
-                                  opcode[8]).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"cross(",6)) { // Cross product
-              _cimg_mp_op("Function 'cross()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss6,s1,depth1,0);
-              arg2 = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,2,3);
-              _cimg_mp_check_type(arg2,2,2,3);
-              pos = vector(3);
-              CImg<ulongT>::vector((ulongT)mp_cross,pos,arg1,arg2).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"cut(",4)) { // Cut
-              _cimg_mp_op("Function 'cut()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(++s1,s2,depth1,0);
-              arg3 = compile(++s2,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector3_vss(mp_cut,arg1,arg2,arg3);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2) && _cimg_mp_is_constant(arg3)) {
-                val = mem[arg1];
-                val1 = mem[arg2];
-                val2 = mem[arg3];
-                _cimg_mp_constant(val<val1?val1:val>val2?val2:val);
-              }
-              _cimg_mp_scalar3(mp_cut,arg1,arg2,arg3);
-            }
-            break;
-
-          case 'd' :
-            if (!std::strncmp(ss,"d(",2)) { // Image depth
-              _cimg_mp_op("Function 'd()'");
-              if (*ss2=='#') { p1 = compile(ss3,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss2!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_d,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"date(",5)) { // Date and file date
-              _cimg_mp_op("Function 'date()'");
-              s1 = ss5; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = 0;
-              is_sth = s1!=se1; // is_fdate
-              if (s1==se1 && ss5!=se1 && // Exactly one argument
-                  (cimg_sscanf(ss5,"%u%c",&arg1,&sep)!=2 || sep!=')')) is_sth = true;
-              if (is_sth) {
-                if (cimg_sscanf(ss5,"%u%c",&arg1,&sep)!=2 || sep!=',') { arg1 = 0; s1 = ss4; }
-                *se1 = 0; val = (double)cimg::fdate(++s1,arg1); *se1 = ')';
-              } else val = (double)cimg::date(arg1);
-              _cimg_mp_constant(val);
-            }
-
-            if (!std::strncmp(ss,"debug(",6)) { // Print debug info
-              _cimg_mp_op("Function 'debug()'");
-              p1 = code._width;
-              arg1 = compile(ss6,se1,depth1,p_ref);
-              *se1 = 0;
-              variable_name.assign(CImg<charT>::string(ss6,true,true).unroll('y'),true);
-              cimg::strpare(variable_name,false,true);
-              ((CImg<ulongT>::vector((ulongT)mp_debug,arg1,0,code._width - p1),
-                variable_name)>'y').move_to(opcode);
-              opcode[2] = opcode._height;
-              opcode.move_to(code,p1);
-              *se1 = ')';
-              _cimg_mp_return(arg1);
-            }
-
-            if (!std::strncmp(ss,"display(",8)) { // Display memory
-              _cimg_mp_op("Function 'display()'");
-              if (pexpr[se2 - expr._data]=='(') { // no arguments?
-                CImg<ulongT>::vector((ulongT)mp_display_memory,_cimg_mp_slot_nan).move_to(code);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-              s1 = ss8; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss8,s1,depth1,0);
-              arg2 = 0; arg3 = arg4 = arg5 = 1;
-              if (s1<se1) {
-                s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                arg2 = compile(s1 + 1,s2,depth1,0);
-                if (s2<se1) {
-                  s3 = ++s2; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                  arg3 = compile(s2,s3,depth1,0);
-                  if (s3<se1) {
-                    s2 = ++s3; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                    arg4 = compile(s3,s2,depth1,0);
-                    arg5 = s2<se1?compile(++s2,se1,depth1,0):0;
-                  }
-                }
-              }
-              _cimg_mp_check_type(arg2,2,1,0);
-              _cimg_mp_check_type(arg3,3,1,0);
-              _cimg_mp_check_type(arg4,4,1,0);
-              _cimg_mp_check_type(arg5,5,1,0);
-
-              c1 = *s1; *s1 = 0;
-              variable_name.assign(CImg<charT>::string(ss8,true,true).unroll('y'),true);
-              cimg::strpare(variable_name,false,true);
-              if (_cimg_mp_is_vector(arg1))
-                ((CImg<ulongT>::vector((ulongT)mp_vector_print,arg1,0,(ulongT)_cimg_mp_vector_size(arg1)),
-                  variable_name)>'y').move_to(opcode);
-              else
-                ((CImg<ulongT>::vector((ulongT)mp_print,arg1,0),
-                  variable_name)>'y').move_to(opcode);
-              opcode[2] = opcode._height;
-              opcode.move_to(code);
-
-              ((CImg<ulongT>::vector((ulongT)mp_display,arg1,0,(ulongT)_cimg_mp_vector_size(arg1),
-                                     arg2,arg3,arg4,arg5),
-                variable_name)>'y').move_to(opcode);
-              opcode[2] = opcode._height;
-              opcode.move_to(code);
-              *s1 = c1;
-              _cimg_mp_return(arg1);
-            }
-
-            if (!std::strncmp(ss,"det(",4)) { // Matrix determinant
-              _cimg_mp_op("Function 'det()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              _cimg_mp_check_matrix_square(arg1,1);
-              p1 = (unsigned int)std::sqrt((float)_cimg_mp_vector_size(arg1));
-              _cimg_mp_scalar2(mp_det,arg1,p1);
-            }
-
-            if (!std::strncmp(ss,"diag(",5)) { // Diagonal matrix
-              _cimg_mp_op("Function 'diag()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,2,0);
-              p1 = _cimg_mp_vector_size(arg1);
-              pos = vector(p1*p1);
-              CImg<ulongT>::vector((ulongT)mp_diag,pos,arg1,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"dot(",4)) { // Dot product
-              _cimg_mp_op("Function 'dot()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              arg2 = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_type(arg2,2,2,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_scalar3(mp_dot,arg1,arg2,_cimg_mp_vector_size(arg1));
-              _cimg_mp_scalar2(mp_mul,arg1,arg2);
-            }
-
-            if (!std::strncmp(ss,"do(",3) || !std::strncmp(ss,"dowhile(",8)) { // Do..while
-              _cimg_mp_op("Function 'dowhile()'");
-              s0 = *ss2=='('?ss3:ss8;
-              s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = code._width;
-              arg6 = mempos;
-              p1 = compile(s0,s1,depth1,0); // Body
-              arg2 = code._width;
-              p2 = s1<se1?compile(++s1,se1,depth1,0):p1; // Condition
-              _cimg_mp_check_type(p2,2,1,0);
-              CImg<ulongT>::vector((ulongT)mp_dowhile,p1,p2,arg2 - arg1,code._width - arg2,_cimg_mp_vector_size(p1),
-                                   p1>=arg6 && !_cimg_mp_is_constant(p1),
-                                   p2>=arg6 && !_cimg_mp_is_constant(p2)).move_to(code,arg1);
-              _cimg_mp_return(p1);
-            }
-
-            if (!std::strncmp(ss,"draw(",5)) { // Draw image
-              is_parallelizable = false;
-              _cimg_mp_op("Function 'draw()'");
-              if (*ss5=='#') { // Index specified
-                s0 = ss6; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                p1 = compile(ss6,s0++,depth1,0);
-                _cimg_mp_check_list(true);
-              } else { p1 = ~0U; s0 = ss5; }
-              s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(s0,s1,depth1,0);
-              arg2 = is_relative?0U:(unsigned int)_cimg_mp_slot_x;
-              arg3 = is_relative?0U:(unsigned int)_cimg_mp_slot_y;
-              arg4 = is_relative?0U:(unsigned int)_cimg_mp_slot_z;
-              arg5 = is_relative?0U:(unsigned int)_cimg_mp_slot_c;
-              s0 = se1;
-              if (s1<se1) {
-                s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                arg2 = compile(++s1,s0,depth1,0);
-                if (_cimg_mp_is_vector(arg2)) { // Coordinates specified as a vector
-                  p2 = _cimg_mp_vector_size(arg2);
-                  ++arg2;
-                  if (p2>1) {
-                    arg3 = arg2 + 1;
-                    if (p2>2) {
-                      arg4 = arg3 + 1;
-                      if (p2>3) arg5 = arg4 + 1;
-                    }
-                  }
-                  ++s0;
-                  is_sth = true;
-                } else {
-                  if (s0<se1) {
-                    is_sth = p1!=~0U;
-                    s1 = s0 + 1; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                    arg3 = compile(++s0,s1,depth1,0);
-                    _cimg_mp_check_type(arg3,is_sth?4:3,1,0);
-                    if (s1<se1) {
-                      s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                      arg4 = compile(++s1,s0,depth1,0);
-                      _cimg_mp_check_type(arg4,is_sth?5:4,1,0);
-                      if (s0<se1) {
-                        s1 = s0 + 1; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                        arg5 = compile(++s0,s1,depth1,0);
-                        _cimg_mp_check_type(arg5,is_sth?6:5,1,0);
-                        s0 = ++s1;
-                      }
-                    }
-                  }
-                  is_sth = false;
-                }
-              }
-
-              CImg<ulongT>::vector((ulongT)mp_image_draw,arg1,(ulongT)_cimg_mp_vector_size(arg1),p1,arg2,arg3,arg4,arg5,
-                                   0,0,0,0,1,(ulongT)~0U,0,1).move_to(opcode);
-
-              arg2 = arg3 = arg4 = arg5 = ~0U;
-              p2 = p1!=~0U?0:1;
-              if (s0<se1) {
-                s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                arg2 = compile(s0,s1,depth1,0);
-                _cimg_mp_check_type(arg2,p2 + (is_sth?3:6),1,0);
-                if (s1<se1) {
-                  s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                  arg3 = compile(++s1,s0,depth1,0);
-                  _cimg_mp_check_type(arg3,p2 + (is_sth?4:7),1,0);
-                  if (s0<se1) {
-                    s1 = s0 + 1; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                    arg4 = compile(++s0,s1,depth1,0);
-                    _cimg_mp_check_type(arg4,p2 + (is_sth?5:8),1,0);
-                    if (s1<se1) {
-                      s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                      arg5 = compile(++s1,s0,depth1,0);
-                      _cimg_mp_check_type(arg5,p2 + (is_sth?6:9),1,0);
-                    }
-                  }
-                }
-              }
-              if (s0<s1) s0 = s1;
-
-              opcode[8] = (ulongT)arg2;
-              opcode[9] = (ulongT)arg3;
-              opcode[10] = (ulongT)arg4;
-              opcode[11] = (ulongT)arg5;
-
-              if (s0<se1) {
-                s1 = s0 + 1; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                arg6 = compile(++s0,s1,depth1,0);
-                _cimg_mp_check_type(arg6,0,1,0);
-                opcode[12] = arg6;
-                if (s1<se1) {
-                  s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                  p2 = compile(++s1,s0,depth1,0);
-                  _cimg_mp_check_type(p2,0,2,0);
-                  opcode[13] = p2;
-                  opcode[14] = _cimg_mp_vector_size(p2);
-                  p3 = s0<se1?compile(++s0,se1,depth1,0):1;
-                  _cimg_mp_check_type(p3,0,1,0);
-                  opcode[15] = p3;
-                }
-              }
-              opcode.move_to(code);
-              _cimg_mp_return(arg1);
-            }
-            break;
-
-          case 'e' :
-            if (!std::strncmp(ss,"eig(",4)) { // Matrix eigenvalues/eigenvector
-              _cimg_mp_op("Function 'eig()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              _cimg_mp_check_matrix_square(arg1,1);
-              p1 = (unsigned int)std::sqrt((float)_cimg_mp_vector_size(arg1));
-              pos = vector((p1 + 1)*p1);
-              CImg<ulongT>::vector((ulongT)mp_matrix_eig,pos,arg1,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"end(",4)) { // End
-              _cimg_mp_op("Function 'end()'");
-              code.swap(code_end);
-              arg1 = compile(ss4,se1,depth1,p_ref);
-              code.swap(code_end);
-              _cimg_mp_return(arg1);
-            }
-
-            if (!std::strncmp(ss,"exp(",4)) { // Exponential
-              _cimg_mp_op("Function 'exp()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_exp,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::exp(mem[arg1]));
-              _cimg_mp_scalar1(mp_exp,arg1);
-            }
-
-            if (!std::strncmp(ss,"eye(",4)) { // Identity matrix
-              _cimg_mp_op("Function 'eye()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              _cimg_mp_check_constant(arg1,1,3);
-              p1 = (unsigned int)mem[arg1];
-              pos = vector(p1*p1);
-              CImg<ulongT>::vector((ulongT)mp_eye,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'f' :
-            if (!std::strncmp(ss,"fact(",5)) { // Factorial
-              _cimg_mp_op("Function 'fact()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_factorial,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::factorial(mem[arg1]));
-              _cimg_mp_scalar1(mp_factorial,arg1);
-            }
-
-            if (!std::strncmp(ss,"fibo(",5)) { // Fibonacci
-              _cimg_mp_op("Function 'fibo()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_fibonacci,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::fibonacci(mem[arg1]));
-              _cimg_mp_scalar1(mp_fibonacci,arg1);
-            }
-
-            if (!std::strncmp(ss,"find(",5)) { // Find
-              _cimg_mp_op("Function 'find()'");
-
-              // First argument: data to look at.
-              s0 = ss5; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-              if (*ss5=='#') { // Index specified
-                p1 = compile(ss6,s0,depth1,0);
-                _cimg_mp_check_list(false);
-                arg1 = ~0U;
-              } else { // Vector specified
-                arg1 = compile(ss5,s0,depth1,0);
-                _cimg_mp_check_type(arg1,1,2,0);
-                p1 = ~0U;
-              }
-
-              // Second argument: data to find.
-              s1 = ++s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg2 = compile(s0,s1,depth1,0);
-
-              // Third and fourth arguments: search direction and starting index.
-              arg3 = 1; arg4 = _cimg_mp_slot_nan;
-              if (s1<se1) {
-                s0 = s1 + 1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                arg3 = compile(++s1,s0,depth1,0);
-                _cimg_mp_check_type(arg3,3,1,0);
-                if (s0<se1) {
-                  arg4 = compile(++s0,se1,depth1,0);
-                  _cimg_mp_check_type(arg4,4,1,0);
-                }
-              }
-              if (p1!=~0U) {
-                if (_cimg_mp_is_vector(arg2))
-                  _cimg_mp_scalar5(mp_list_find_seq,p1,arg2,_cimg_mp_vector_size(arg2),arg3,arg4);
-                _cimg_mp_scalar4(mp_list_find,p1,arg2,arg3,arg4);
-              }
-              if (_cimg_mp_is_vector(arg2))
-                _cimg_mp_scalar6(mp_find_seq,arg1,_cimg_mp_vector_size(arg1),arg2,_cimg_mp_vector_size(arg2),arg3,arg4);
-              _cimg_mp_scalar5(mp_find,arg1,_cimg_mp_vector_size(arg1),arg2,arg3,arg4);
-            }
-
-            if (*ss1=='o' && *ss2=='r' && *ss3=='(') { // For loop
-              _cimg_mp_op("Function 'for()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              s3 = s2 + 1; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-              arg1 = code._width;
-              p1 = compile(ss4,s1,depth1,0); // Init
-              arg2 = code._width;
-              p2 = compile(++s1,s2,depth1,0); // Cond
-              arg3 = code._width;
-              arg6 = mempos;
-              if (s3<se1) { // Body + post
-                p3 = compile(s3 + 1,se1,depth1,0); // Body
-                arg4 = code._width;
-                pos = compile(++s2,s3,depth1,0); // Post
-              } else {
-                p3 = compile(++s2,se1,depth1,0); // Body only
-                arg4 = pos = code._width;
-              }
-              _cimg_mp_check_type(p2,2,1,0);
-              arg5 = _cimg_mp_vector_size(pos);
-              CImg<ulongT>::vector((ulongT)mp_for,p3,(ulongT)_cimg_mp_vector_size(p3),p2,arg2 - arg1,arg3 - arg2,
-                                   arg4 - arg3,code._width - arg4,
-                                   p3>=arg6 && !_cimg_mp_is_constant(p3),
-                                   p2>=arg6 && !_cimg_mp_is_constant(p2)).move_to(code,arg1);
-              _cimg_mp_return(p3);
-            }
-            break;
-
-          case 'g' :
-            if (!std::strncmp(ss,"gauss(",6)) { // Gaussian function
-              _cimg_mp_op("Function 'gauss()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss6,s1,depth1,0);
-              arg2 = s1<se1?compile(++s1,se1,depth1,0):1;
-              _cimg_mp_check_type(arg2,2,1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector2_vs(mp_gauss,arg1,arg2);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2)) {
-                val1 = mem[arg1];
-                val2 = mem[arg2];
-                _cimg_mp_constant(std::exp(-val1*val1/(2*val2*val2))/std::sqrt(2*val2*val2*cimg::PI));
-              }
-              _cimg_mp_scalar2(mp_gauss,arg1,arg2);
-            }
-            break;
-
-          case 'h' :
-            if (!std::strncmp(ss,"h(",2)) { // Image height
-              _cimg_mp_op("Function 'h()'");
-              if (*ss2=='#') { p1 = compile(ss3,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss2!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_h,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-          case 'i' :
-            if (*ss1=='f' && *ss2=='(') { // If..then[..else.]
-              _cimg_mp_op("Function 'if()'");
-              s1 = ss3; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg1 = compile(ss3,s1,depth1,0);
-              _cimg_mp_check_type(arg1,1,1,0);
-              if (_cimg_mp_is_constant(arg1)) {
-                if ((bool)mem[arg1]) return compile(++s1,s2,depth1,0);
-                else return s2<se1?compile(++s2,se1,depth1,0):0;
-              }
-              p2 = code._width;
-              arg2 = compile(++s1,s2,depth1,0);
-              p3 = code._width;
-              arg3 = s2<se1?compile(++s2,se1,depth1,0):_cimg_mp_is_vector(arg2)?vector(_cimg_mp_vector_size(arg2),0):0;
-              _cimg_mp_check_type(arg3,3,_cimg_mp_is_vector(arg2)?2:1,_cimg_mp_vector_size(arg2));
-              arg4 = _cimg_mp_vector_size(arg2);
-              if (arg4) pos = vector(arg4); else pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_if,pos,arg1,arg2,arg3,
-                                  p3 - p2,code._width - p3,arg4).move_to(code,p2);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"init(",5)) { // Init
-              _cimg_mp_op("Function 'init()'");
-              code.swap(code_init);
-              arg1 = compile(ss5,se1,depth1,p_ref);
-              code.swap(code_init);
-              _cimg_mp_return(arg1);
-            }
-
-            if (!std::strncmp(ss,"int(",4)) { // Integer cast
-              _cimg_mp_op("Function 'int()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_int,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant((longT)mem[arg1]);
-              _cimg_mp_scalar1(mp_int,arg1);
-            }
-
-            if (!std::strncmp(ss,"inv(",4)) { // Matrix/scalar inversion
-              _cimg_mp_op("Function 'inv()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) {
-                _cimg_mp_check_matrix_square(arg1,1);
-                p1 = (unsigned int)std::sqrt((float)_cimg_mp_vector_size(arg1));
-                pos = vector(p1*p1);
-                CImg<ulongT>::vector((ulongT)mp_matrix_inv,pos,arg1,p1).move_to(code);
-                _cimg_mp_return(pos);
-              }
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(1/mem[arg1]);
-              _cimg_mp_scalar2(mp_div,1,arg1);
-            }
-
-            if (*ss1=='s') { // Family of 'is_?()' functions
-
-              if (!std::strncmp(ss,"isbool(",7)) { // Is boolean?
-                _cimg_mp_op("Function 'isbool()'");
-                if (ss7==se1) _cimg_mp_return(0);
-                arg1 = compile(ss7,se1,depth1,0);
-                if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_isbool,arg1);
-                if (_cimg_mp_is_constant(arg1)) _cimg_mp_return(mem[arg1]==0.0 || mem[arg1]==1.0);
-                _cimg_mp_scalar1(mp_isbool,arg1);
-              }
-
-              if (!std::strncmp(ss,"isdir(",6)) { // Is directory?
-                _cimg_mp_op("Function 'isdir()'");
-                *se1 = 0;
-                is_sth = cimg::is_directory(ss6);
-                *se1 = ')';
-                _cimg_mp_return(is_sth?1U:0U);
-              }
-
-              if (!std::strncmp(ss,"isfile(",7)) { // Is file?
-                _cimg_mp_op("Function 'isfile()'");
-                *se1 = 0;
-                is_sth = cimg::is_file(ss7);
-                *se1 = ')';
-                _cimg_mp_return(is_sth?1U:0U);
-              }
-
-              if (!std::strncmp(ss,"isin(",5)) { // Is in sequence/vector?
-                if (ss5>=se1) _cimg_mp_return(0);
-                _cimg_mp_op("Function 'isin()'");
-                pos = scalar();
-                CImg<ulongT>::vector((ulongT)mp_isin,pos,0).move_to(_opcode);
-                for (s = ss5; s<se; ++s) {
-                  ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                                 (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                  arg1 = compile(s,ns,depth1,0);
-                  if (_cimg_mp_is_vector(arg1))
-                    CImg<ulongT>::sequence(_cimg_mp_vector_size(arg1),arg1 + 1,
-                                           arg1 + (ulongT)_cimg_mp_vector_size(arg1)).
-                      move_to(_opcode);
-                  else CImg<ulongT>::vector(arg1).move_to(_opcode);
-                  s = ns;
-                }
-                (_opcode>'y').move_to(opcode);
-                opcode[2] = opcode._height;
-                opcode.move_to(code);
-                _cimg_mp_return(pos);
-              }
-
-              if (!std::strncmp(ss,"isinf(",6)) { // Is infinite?
-                _cimg_mp_op("Function 'isinf()'");
-                if (ss6==se1) _cimg_mp_return(0);
-                arg1 = compile(ss6,se1,depth1,0);
-                if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_isinf,arg1);
-                if (_cimg_mp_is_constant(arg1)) _cimg_mp_return((unsigned int)cimg::type<double>::is_inf(mem[arg1]));
-                _cimg_mp_scalar1(mp_isinf,arg1);
-              }
-
-              if (!std::strncmp(ss,"isint(",6)) { // Is integer?
-                _cimg_mp_op("Function 'isint()'");
-                if (ss6==se1) _cimg_mp_return(0);
-                arg1 = compile(ss6,se1,depth1,0);
-                if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_isint,arg1);
-                if (_cimg_mp_is_constant(arg1)) _cimg_mp_return((unsigned int)(cimg::mod(mem[arg1],1.0)==0));
-                _cimg_mp_scalar1(mp_isint,arg1);
-              }
-
-              if (!std::strncmp(ss,"isnan(",6)) { // Is NaN?
-                _cimg_mp_op("Function 'isnan()'");
-                if (ss6==se1) _cimg_mp_return(0);
-                arg1 = compile(ss6,se1,depth1,0);
-                if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_isnan,arg1);
-                if (_cimg_mp_is_constant(arg1)) _cimg_mp_return((unsigned int)cimg::type<double>::is_nan(mem[arg1]));
-                _cimg_mp_scalar1(mp_isnan,arg1);
-              }
-
-              if (!std::strncmp(ss,"isval(",6)) { // Is value?
-                _cimg_mp_op("Function 'isval()'");
-                val = 0;
-                if (cimg_sscanf(ss6,"%lf%c%c",&val,&sep,&end)==2 && sep==')') _cimg_mp_return(1);
-                _cimg_mp_return(0);
-              }
-
-            }
-            break;
-
-          case 'l' :
-            if (!std::strncmp(ss,"log(",4)) { // Natural logarithm
-              _cimg_mp_op("Function 'log()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_log,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::log(mem[arg1]));
-              _cimg_mp_scalar1(mp_log,arg1);
-            }
-
-            if (!std::strncmp(ss,"log2(",5)) { // Base-2 logarithm
-              _cimg_mp_op("Function 'log2()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_log2,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::log2(mem[arg1]));
-              _cimg_mp_scalar1(mp_log2,arg1);
-            }
-
-            if (!std::strncmp(ss,"log10(",6)) { // Base-10 logarithm
-              _cimg_mp_op("Function 'log10()'");
-              arg1 = compile(ss6,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_log10,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::log10(mem[arg1]));
-              _cimg_mp_scalar1(mp_log10,arg1);
-            }
-
-            if (!std::strncmp(ss,"lowercase(",10)) { // Lower case
-              _cimg_mp_op("Function 'lowercase()'");
-              arg1 = compile(ss + 10,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_lowercase,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::lowercase(mem[arg1]));
-              _cimg_mp_scalar1(mp_lowercase,arg1);
-            }
-            break;
-
-          case 'm' :
-            if (!std::strncmp(ss,"mul(",4)) { // Matrix multiplication
-              _cimg_mp_op("Function 'mul()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(++s1,s2,depth1,0);
-              arg3 = s2<se1?compile(++s2,se1,depth1,0):1;
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_type(arg2,2,2,0);
-              _cimg_mp_check_constant(arg3,3,3);
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = _cimg_mp_vector_size(arg2);
-              p3 = (unsigned int)mem[arg3];
-              arg5 = p2/p3;
-              arg4 = p1/arg5;
-              if (arg4*arg5!=p1 || arg5*p3!=p2) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Types of first and second arguments ('%s' and '%s') "
-                                            "do not match with third argument 'nb_colsB=%u', "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s_type(arg1)._data,s_type(arg2)._data,p3,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(arg4*p3);
-              CImg<ulongT>::vector((ulongT)mp_matrix_mul,pos,arg1,arg2,arg4,arg5,p3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'n' :
-            if (!std::strncmp(ss,"narg(",5)) { // Number of arguments
-              _cimg_mp_op("Function 'narg()'");
-              if (ss5>=se1) _cimg_mp_return(0);
-              arg1 = 0;
-              for (s = ss5; s<se; ++s) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                ++arg1; s = ns;
-              }
-              _cimg_mp_constant(arg1);
-            }
-
-            if ((cimg_sscanf(ss,"norm%u%c",&(arg1=~0U),&sep)==2 && sep=='(') ||
-                !std::strncmp(ss,"norminf(",8) || !std::strncmp(ss,"norm(",5) ||
-                (!std::strncmp(ss,"norm",4) && ss5<se1 && (s=std::strchr(ss5,'('))!=0)) { // Lp norm
-              _cimg_mp_op("Function 'normP()'");
-              if (*ss4=='(') { arg1 = 2; s = ss5; }
-              else if (*ss4=='i' && *ss5=='n' && *ss6=='f' && *ss7=='(') { arg1 = ~0U; s = ss8; }
-              else if (arg1==~0U) {
-                arg1 = compile(ss4,s++,depth1,0);
-                _cimg_mp_check_constant(arg1,0,2);
-                arg1 = (unsigned int)mem[arg1];
-              } else s = std::strchr(ss4,'(') + 1;
-              pos = scalar();
-              switch (arg1) {
-              case 0 :
-                CImg<ulongT>::vector((ulongT)mp_norm0,pos,0).move_to(_opcode); break;
-              case 1 :
-                CImg<ulongT>::vector((ulongT)mp_norm1,pos,0).move_to(_opcode); break;
-              case 2 :
-                CImg<ulongT>::vector((ulongT)mp_norm2,pos,0).move_to(_opcode); break;
-              case ~0U :
-                CImg<ulongT>::vector((ulongT)mp_norminf,pos,0).move_to(_opcode); break;
-              default :
-                CImg<ulongT>::vector((ulongT)mp_normp,pos,0,(ulongT)(arg1==~0U?-1:(int)arg1)).
-                  move_to(_opcode);
-              }
-              for ( ; s<se; ++s) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                arg2 = compile(s,ns,depth1,0);
-                if (_cimg_mp_is_vector(arg2))
-                  CImg<ulongT>::sequence(_cimg_mp_vector_size(arg2),arg2 + 1,
-                                         arg2 + (ulongT)_cimg_mp_vector_size(arg2)).
-                    move_to(_opcode);
-                else CImg<ulongT>::vector(arg2).move_to(_opcode);
-                s = ns;
-              }
-
-              (_opcode>'y').move_to(opcode);
-              if (arg1>0 && opcode._height==4) // Special case with one argument and p>=1
-                _cimg_mp_scalar1(mp_abs,opcode[3]);
-              opcode[2] = opcode._height;
-              opcode.move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'p' :
-            if (!std::strncmp(ss,"permut(",7)) { // Number of permutations
-              _cimg_mp_op("Function 'permut()'");
-              s1 = ss7; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg1 = compile(ss7,s1,depth1,0);
-              arg2 = compile(++s1,s2,depth1,0);
-              arg3 = compile(++s2,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,1,0);
-              _cimg_mp_check_type(arg2,2,1,0);
-              _cimg_mp_check_type(arg3,3,1,0);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2) && _cimg_mp_is_constant(arg3))
-                _cimg_mp_constant(cimg::permutations(mem[arg1],mem[arg2],(bool)mem[arg3]));
-              _cimg_mp_scalar3(mp_permutations,arg1,arg2,arg3);
-            }
-
-            if (!std::strncmp(ss,"pseudoinv(",10)) { // Matrix/scalar pseudo-inversion
-              _cimg_mp_op("Function 'pseudoinv()'");
-              s1 = ss + 10; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss + 10,s1,depth1,0);
-              arg2 = s1<se1?compile(++s1,se1,depth1,0):1;
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_constant(arg2,2,3);
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = (unsigned int)mem[arg2];
-              p3 = p1/p2;
-              if (p3*p2!=p1) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Type of first argument ('%s') "
-                                            "does not match with second argument 'nb_colsA=%u', "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s_type(arg1)._data,p2,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(p1);
-              CImg<ulongT>::vector((ulongT)mp_matrix_pseudoinv,pos,arg1,p2,p3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"print(",6)) { // Print expressions
-              _cimg_mp_op("Function 'print()'");
-              for (s = ss6; s<se; ++s) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                pos = compile(s,ns,depth1,p_ref);
-                c1 = *ns; *ns = 0;
-                variable_name.assign(CImg<charT>::string(s,true,true).unroll('y'),true);
-                cimg::strpare(variable_name,false,true);
-                if (_cimg_mp_is_vector(pos)) // Vector
-                  ((CImg<ulongT>::vector((ulongT)mp_vector_print,pos,0,(ulongT)_cimg_mp_vector_size(pos)),
-                    variable_name)>'y').move_to(opcode);
-                else // Scalar
-                  ((CImg<ulongT>::vector((ulongT)mp_print,pos,0),
-                    variable_name)>'y').move_to(opcode);
-                opcode[2] = opcode._height;
-                opcode.move_to(code);
-                *ns = c1; s = ns;
-              }
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'r' :
-            if (!std::strncmp(ss,"resize(",7)) { // Vector or image resize
-              _cimg_mp_op("Function 'resize()'");
-              if (*ss7!='#') { // Vector
-                s1 = ss7; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                arg1 = compile(ss7,s1,depth1,0);
-                s2 = ++s1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                arg2 = compile(s1,s2,depth1,0);
-                arg3 = 1;
-                arg4 = 0;
-                if (s2<se1) {
-                  s1 = ++s2; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-                  arg3 = compile(s2,s1,depth1,0);
-                  arg4 = s1<se1?compile(++s1,se1,depth1,0):0;
-                }
-                _cimg_mp_check_constant(arg2,2,3);
-                arg2 = (unsigned int)mem[arg2];
-                _cimg_mp_check_type(arg3,3,1,0);
-                _cimg_mp_check_type(arg4,4,1,0);
-                pos = vector(arg2);
-                CImg<ulongT>::vector((ulongT)mp_vector_resize,pos,arg2,arg1,(ulongT)_cimg_mp_vector_size(arg1),
-                                     arg3,arg4).move_to(code);
-                _cimg_mp_return(pos);
-
-              } else { // Image
-                is_parallelizable = false;
-                s0 = ss8; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                p1 = compile(ss8,s0++,depth1,0);
-                _cimg_mp_check_list(true);
-                CImg<ulongT>::vector((ulongT)mp_image_resize,_cimg_mp_slot_nan,p1,~0U,~0U,~0U,~0U,1,0,0,0,0,0).
-                  move_to(opcode);
-                pos = 0;
-                for (s = s0; s<se && pos<10; ++s) {
-                  ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                                 (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                  arg1 = compile(s,ns,depth1,0);
-                  _cimg_mp_check_type(arg1,pos + 2,1,0);
-                  opcode[pos + 3] = arg1;
-                  s = ns;
-                  ++pos;
-                }
-                if (pos<1 || pos>10) {
-                  *se = saved_char;
-                  s0 = ss - 4>expr._data?ss - 4:expr._data;
-                  cimg::strellipsize(s0,64);
-                  throw CImgArgumentException("[_cimg_math_parser] "
-                                              "CImg<%s>::%s: %s: %s arguments, in expression '%s%s%s'.",
-                                              pixel_type(),_cimg_mp_calling_function,s_op,
-                                              pos<1?"Missing":"Too much",
-                                              s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-                }
-                opcode.move_to(code);
-                _cimg_mp_return(_cimg_mp_slot_nan);
-              }
-            }
-
-            if (!std::strncmp(ss,"reverse(",8)) { // Vector reverse
-              _cimg_mp_op("Function 'reverse()'");
-              arg1 = compile(ss8,se1,depth1,0);
-              if (!_cimg_mp_is_vector(arg1)) _cimg_mp_return(arg1);
-              p1 = _cimg_mp_vector_size(arg1);
-              pos = vector(p1);
-              CImg<ulongT>::vector((ulongT)mp_vector_reverse,pos,arg1,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"rol(",4) || !std::strncmp(ss,"ror(",4)) { // Bitwise rotation
-              _cimg_mp_op(ss[2]=='l'?"Function 'rol()'":"Function 'ror()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              arg2 = s1<se1?compile(++s1,se1,depth1,0):1;
-              _cimg_mp_check_type(arg2,2,1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector2_vs(*ss2=='l'?mp_rol:mp_ror,arg1,arg2);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-                _cimg_mp_constant(*ss2=='l'?cimg::rol(mem[arg1],(unsigned int)mem[arg2]):
-                                  cimg::ror(mem[arg1],(unsigned int)mem[arg2]));
-              _cimg_mp_scalar2(*ss2=='l'?mp_rol:mp_ror,arg1,arg2);
-            }
-
-            if (!std::strncmp(ss,"rot(",4)) { // 2d/3d rotation matrix
-              _cimg_mp_op("Function 'rot()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              if (s1<se1) { // 3d rotation
-                _cimg_mp_check_type(arg1,1,3,3);
-                is_sth = false; // Is coordinates as vector?
-                if (_cimg_mp_is_vector(arg1)) { // Coordinates specified as a vector
-                  is_sth = true;
-                  p2 = _cimg_mp_vector_size(arg1);
-                  ++arg1;
-                  arg2 = arg3 = 0;
-                  if (p2>1) {
-                    arg2 = arg1 + 1;
-                    if (p2>2) arg3 = arg2 + 1;
-                  }
-                  arg4 = compile(++s1,se1,depth1,0);
-                } else {
-                  s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                  arg2 = compile(++s1,s2,depth1,0);
-                  s3 = s2 + 1; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                  arg3 = compile(++s2,s3,depth1,0);
-                  arg4 = compile(++s3,se1,depth1,0);
-                  _cimg_mp_check_type(arg2,2,1,0);
-                  _cimg_mp_check_type(arg3,3,1,0);
-                }
-                _cimg_mp_check_type(arg4,is_sth?2:4,1,0);
-                pos = vector(9);
-                CImg<ulongT>::vector((ulongT)mp_rot3d,pos,arg1,arg2,arg3,arg4).move_to(code);
-              } else { // 2d rotation
-                _cimg_mp_check_type(arg1,1,1,0);
-                pos = vector(4);
-                CImg<ulongT>::vector((ulongT)mp_rot2d,pos,arg1).move_to(code);
-              }
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"round(",6)) { // Value rounding
-              _cimg_mp_op("Function 'round()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss6,s1,depth1,0);
-              arg2 = 1;
-              arg3 = 0;
-              if (s1<se1) {
-                s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-                arg2 = compile(++s1,s2,depth1,0);
-                arg3 = s2<se1?compile(++s2,se1,depth1,0):0;
-              }
-              _cimg_mp_check_type(arg2,2,1,0);
-              _cimg_mp_check_type(arg3,3,1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector3_vss(mp_round,arg1,arg2,arg3);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2) && _cimg_mp_is_constant(arg3))
-                _cimg_mp_constant(cimg::round(mem[arg1],mem[arg2],(int)mem[arg3]));
-              _cimg_mp_scalar3(mp_round,arg1,arg2,arg3);
-            }
-            break;
-
-          case 's' :
-            if (!std::strncmp(ss,"s(",2)) { // Image spectrum
-              _cimg_mp_op("Function 's()'");
-              if (*ss2=='#') { p1 = compile(ss3,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss2!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_s,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"same(",5)) { // Test if operands have the same values
-              _cimg_mp_op("Function 'same()'");
-              s1 = ss5; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss5,s1,depth1,0);
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(++s1,s2,depth1,0);
-              arg3 = 11;
-              arg4 = 1;
-              if (s2<se1) {
-                s3 = s2 + 1; while (s3<se1 && (*s3!=',' || level[s3 - expr._data]!=clevel1)) ++s3;
-                arg3 = compile(++s2,s3,depth1,0);
-                _cimg_mp_check_type(arg3,3,1,0);
-                arg4 = s3<se1?compile(++s3,se1,depth1,0):1;
-              }
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = _cimg_mp_vector_size(arg2);
-              _cimg_mp_scalar6(mp_vector_eq,arg1,p1,arg2,p2,arg3,arg4);
-            }
-
-            if (!std::strncmp(ss,"sign(",5)) { // Sign
-              _cimg_mp_op("Function 'sign()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sign,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::sign(mem[arg1]));
-              _cimg_mp_scalar1(mp_sign,arg1);
-            }
-
-            if (!std::strncmp(ss,"sin(",4)) { // Sine
-              _cimg_mp_op("Function 'sin()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sin,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::sin(mem[arg1]));
-              _cimg_mp_scalar1(mp_sin,arg1);
-            }
-
-            if (!std::strncmp(ss,"sinc(",5)) { // Sine cardinal
-              _cimg_mp_op("Function 'sinc()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sinc,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::sinc(mem[arg1]));
-              _cimg_mp_scalar1(mp_sinc,arg1);
-            }
-
-            if (!std::strncmp(ss,"single(",7)) { // Force single thread execution
-              _cimg_mp_op("Function 'single()'");
-              p1 = code._width;
-              arg1 = compile(ss7,se1,depth1,p_ref);
-              CImg<ulongT>::vector((ulongT)mp_single,arg1,code._width - p1).move_to(code,p1);
-              _cimg_mp_return(arg1);
-            }
-
-            if (!std::strncmp(ss,"sinh(",5)) { // Hyperbolic sine
-              _cimg_mp_op("Function 'sinh()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sinh,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::sinh(mem[arg1]));
-              _cimg_mp_scalar1(mp_sinh,arg1);
-            }
-
-            if (!std::strncmp(ss,"size(",5)) { // Vector size.
-              _cimg_mp_op("Function 'size()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              _cimg_mp_constant(_cimg_mp_is_scalar(arg1)?0:_cimg_mp_vector_size(arg1));
-            }
-
-            if (!std::strncmp(ss,"solve(",6)) { // Solve linear system
-              _cimg_mp_op("Function 'solve()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss6,s1,depth1,0);
-              s2 = s1 + 1; while (s2<se1 && (*s2!=',' || level[s2 - expr._data]!=clevel1)) ++s2;
-              arg2 = compile(++s1,s2,depth1,0);
-              arg3 = s2<se1?compile(++s2,se1,depth1,0):1;
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_type(arg2,2,2,0);
-              _cimg_mp_check_constant(arg3,3,3);
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = _cimg_mp_vector_size(arg2);
-              p3 = (unsigned int)mem[arg3];
-              arg5 = p2/p3;
-              arg4 = p1/arg5;
-              if (arg4*arg5!=p1 || arg5*p3!=p2) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Types of first and second arguments ('%s' and '%s') "
-                                            "do not match with third argument 'nb_colsB=%u', "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s_type(arg1)._data,s_type(arg2)._data,p3,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(arg4*p3);
-              CImg<ulongT>::vector((ulongT)mp_solve,pos,arg1,arg2,arg4,arg5,p3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"sort(",5)) { // Sort vector
-              _cimg_mp_op("Function 'sort()'");
-              s1 = ss6; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss5,s1,depth1,0);
-              arg2 = arg3 = 1;
-              if (s1<se1) {
-                s0 = ++s1; while (s0<se1 && (*s0!=',' || level[s0 - expr._data]!=clevel1)) ++s0;
-                arg2 = compile(s1,s0,depth1,0);
-                arg3 = s0<se1?compile(++s0,se1,depth1,0):1;
-              }
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_type(arg2,2,1,0);
-              _cimg_mp_check_constant(arg3,3,3);
-              arg3 = (unsigned int)mem[arg3];
-              p1 = _cimg_mp_vector_size(arg1);
-              if (p1%arg3) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Invalid specified chunk size (%u) for first argument "
-                                            "('%s'), in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            arg3,s_type(arg1)._data,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(p1);
-              CImg<ulongT>::vector((ulongT)mp_sort,pos,arg1,p1,arg2,arg3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"sqr(",4)) { // Square
-              _cimg_mp_op("Function 'sqr()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sqr,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::sqr(mem[arg1]));
-              _cimg_mp_scalar1(mp_sqr,arg1);
-            }
-
-            if (!std::strncmp(ss,"sqrt(",5)) { // Square root
-              _cimg_mp_op("Function 'sqrt()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_sqrt,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::sqrt(mem[arg1]));
-              _cimg_mp_scalar1(mp_sqrt,arg1);
-            }
-
-            if (!std::strncmp(ss,"stod(",5)) { // String to double
-              _cimg_mp_op("Function 'stod()'");
-              s1 = ss5; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss5,s1,depth1,0);
-              arg2 = s1<se1?compile(++s1,se1,depth1,0):0;
-              _cimg_mp_check_type(arg2,2,1,0);
-              p1 = _cimg_mp_vector_size(arg1);
-              _cimg_mp_scalar3(mp_stod,arg1,p1,arg2);
-            }
-
-            if (!std::strncmp(ss,"svd(",4)) { // Matrix SVD
-              _cimg_mp_op("Function 'svd()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              arg2 = s1<se1?compile(++s1,se1,depth1,0):1;
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_constant(arg2,2,3);
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = (unsigned int)mem[arg2];
-              p3 = p1/p2;
-              if (p3*p2!=p1) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Type of first argument ('%s') "
-                                            "does not match with second argument 'nb_colsA=%u', "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s_type(arg1)._data,p2,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(p1 + p2 + p2*p2);
-              CImg<ulongT>::vector((ulongT)mp_matrix_svd,pos,arg1,p2,p3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 't' :
-            if (!std::strncmp(ss,"tan(",4)) { // Tangent
-              _cimg_mp_op("Function 'tan()'");
-              arg1 = compile(ss4,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_tan,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::tan(mem[arg1]));
-              _cimg_mp_scalar1(mp_tan,arg1);
-            }
-
-            if (!std::strncmp(ss,"tanh(",5)) { // Hyperbolic tangent
-              _cimg_mp_op("Function 'tanh()'");
-              arg1 = compile(ss5,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_tanh,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(std::tanh(mem[arg1]));
-              _cimg_mp_scalar1(mp_tanh,arg1);
-            }
-
-            if (!std::strncmp(ss,"trace(",6)) { // Matrix trace
-              _cimg_mp_op("Function 'trace()'");
-              arg1 = compile(ss6,se1,depth1,0);
-              _cimg_mp_check_matrix_square(arg1,1);
-              p1 = (unsigned int)std::sqrt((float)_cimg_mp_vector_size(arg1));
-              _cimg_mp_scalar2(mp_trace,arg1,p1);
-            }
-
-            if (!std::strncmp(ss,"transp(",7)) { // Matrix transpose
-              _cimg_mp_op("Function 'transp()'");
-              s1 = ss7; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss7,s1,depth1,0);
-              arg2 = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,2,0);
-              _cimg_mp_check_constant(arg2,2,3);
-              p1 = _cimg_mp_vector_size(arg1);
-              p2 = (unsigned int)mem[arg2];
-              p3 = p1/p2;
-              if (p2*p3!=p1) {
-                *se = saved_char;
-                s0 = ss - 4>expr._data?ss - 4:expr._data;
-                cimg::strellipsize(s0,64);
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: %s: Size of first argument ('%s') does not match "
-                                            "second argument 'nb_cols=%u', in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,s_op,
-                                            s_type(arg1)._data,p2,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              }
-              pos = vector(p3*p2);
-              CImg<ulongT>::vector((ulongT)mp_transp,pos,arg1,p2,p3).move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'u' :
-            if (*ss1=='(') { // Random value with uniform distribution
-              _cimg_mp_op("Function 'u()'");
-              if (*ss2==')') _cimg_mp_scalar2(mp_u,0,1);
-              s1 = ss2; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss2,s1,depth1,0);
-              if (s1<se1) arg2 = compile(++s1,se1,depth1,0); else { arg2 = arg1; arg1 = 0; }
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_u,arg1,arg2);
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_u,arg1,arg2);
-              if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_u,arg1,arg2);
-              _cimg_mp_scalar2(mp_u,arg1,arg2);
-            }
-
-            if (!std::strncmp(ss,"unref(",6)) { // Un-reference variable
-              _cimg_mp_op("Function 'unref()'");
-              arg1 = ~0U;
-              for (s0 = ss6; s0<se1; s0 = s1) {
-                if (s0>ss6 && *s0==',') ++s0;
-                s1 = s0; while (s1<se1 && *s1!=',') ++s1;
-                c1 = *s1;
-                if (s1>s0) {
-                  *s1 = 0;
-                  arg2 = arg3 = ~0U;
-                  if (s0[0]=='w' && s0[1]=='h' && !s0[2]) arg1 = reserved_label[arg3 = 0];
-                  else if (s0[0]=='w' && s0[1]=='h' && s0[2]=='d' && !s0[3]) arg1 = reserved_label[arg3 = 1];
-                  else if (s0[0]=='w' && s0[1]=='h' && s0[2]=='d' && s0[3]=='s' && !s0[4])
-                    arg1 = reserved_label[arg3 = 2];
-                  else if (s0[0]=='p' && s0[1]=='i' && !s0[2]) arg1 = reserved_label[arg3 = 3];
-                  else if (s0[0]=='i' && s0[1]=='m' && !s0[2]) arg1 = reserved_label[arg3 = 4];
-                  else if (s0[0]=='i' && s0[1]=='M' && !s0[2]) arg1 = reserved_label[arg3 = 5];
-                  else if (s0[0]=='i' && s0[1]=='a' && !s0[2]) arg1 = reserved_label[arg3 = 6];
-                  else if (s0[0]=='i' && s0[1]=='v' && !s0[2]) arg1 = reserved_label[arg3 = 7];
-                  else if (s0[0]=='i' && s0[1]=='s' && !s0[2]) arg1 = reserved_label[arg3 = 8];
-                  else if (s0[0]=='i' && s0[1]=='p' && !s0[2]) arg1 = reserved_label[arg3 = 9];
-                  else if (s0[0]=='i' && s0[1]=='c' && !s0[2]) arg1 = reserved_label[arg3 = 10];
-                  else if (s0[0]=='x' && s0[1]=='m' && !s0[2]) arg1 = reserved_label[arg3 = 11];
-                  else if (s0[0]=='y' && s0[1]=='m' && !s0[2]) arg1 = reserved_label[arg3 = 12];
-                  else if (s0[0]=='z' && s0[1]=='m' && !s0[2]) arg1 = reserved_label[arg3 = 13];
-                  else if (s0[0]=='c' && s0[1]=='m' && !s0[2]) arg1 = reserved_label[arg3 = 14];
-                  else if (s0[0]=='x' && s0[1]=='M' && !s0[2]) arg1 = reserved_label[arg3 = 15];
-                  else if (s0[0]=='y' && s0[1]=='M' && !s0[2]) arg1 = reserved_label[arg3 = 16];
-                  else if (s0[0]=='z' && s0[1]=='M' && !s0[2]) arg1 = reserved_label[arg3 = 17];
-                  else if (s0[0]=='c' && s0[1]=='M' && !s0[2]) arg1 = reserved_label[arg3 = 18];
-                  else if (s0[0]=='i' && s0[1]>='0' && s0[1]<='9' && !s0[2])
-                    arg1 = reserved_label[arg3 = 19 + s0[1] - '0'];
-                  else if (!std::strcmp(s0,"interpolation")) arg1 = reserved_label[arg3 = 29];
-                  else if (!std::strcmp(s0,"boundary")) arg1 = reserved_label[arg3 = 30];
-                  else if (s0[1]) { // Multi-char variable
-                    cimglist_for(variable_def,i) if (!std::strcmp(s0,variable_def[i])) {
-                      arg1 = variable_pos[i]; arg2 = i; break;
-                    }
-                  } else arg1 = reserved_label[arg3 = *s0]; // Single-char variable
-
-                  if (arg1!=~0U) {
-                    if (arg2==~0U) { if (arg3!=~0U) reserved_label[arg3] = ~0U; }
-                    else {
-                      variable_def.remove(arg2);
-                      if (arg2<variable_pos._width - 1)
-                        std::memmove(variable_pos._data + arg2,variable_pos._data + arg2 + 1,
-                                     sizeof(uintT)*(variable_pos._width - arg2 - 1));
-                      --variable_pos._width;
-                    }
-                  }
-                  *s1 = c1;
-                } else compile(s0,s1,depth1,0); // Will throw a 'missing argument' exception
-              }
-              _cimg_mp_return(arg1!=~0U?arg1:_cimg_mp_slot_nan); // Return value of last specified variable.
-            }
-
-            if (!std::strncmp(ss,"uppercase(",10)) { // Upper case
-              _cimg_mp_op("Function 'uppercase()'");
-              arg1 = compile(ss + 10,se1,depth1,0);
-              if (_cimg_mp_is_vector(arg1)) _cimg_mp_vector1_v(mp_uppercase,arg1);
-              if (_cimg_mp_is_constant(arg1)) _cimg_mp_constant(cimg::uppercase(mem[arg1]));
-              _cimg_mp_scalar1(mp_uppercase,arg1);
-            }
-            break;
-
-          case 'v' :
-            if ((cimg_sscanf(ss,"vector%u%c",&(arg1=~0U),&sep)==2 && sep=='(' && arg1>0) ||
-                !std::strncmp(ss,"vector(",7) ||
-                (!std::strncmp(ss,"vector",6) && ss7<se1 && (s=std::strchr(ss7,'('))!=0)) { // Vector
-              _cimg_mp_op("Function 'vector()'");
-              arg2 = 0; // Number of specified values.
-              if (arg1==~0U && *ss6!='(') {
-                arg1 = compile(ss6,s++,depth1,0);
-                _cimg_mp_check_constant(arg1,0,3);
-                arg1 = (unsigned int)mem[arg1];
-              } else s = std::strchr(ss6,'(') + 1;
-
-              if (s<se1 || arg1==~0U) for ( ; s<se; ++s) {
-                  ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                                 (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                  arg3 = compile(s,ns,depth1,0);
-                  if (_cimg_mp_is_vector(arg3)) {
-                    arg4 = _cimg_mp_vector_size(arg3);
-                    CImg<ulongT>::sequence(arg4,arg3 + 1,arg3 + arg4).move_to(_opcode);
-                    arg2+=arg4;
-                  } else { CImg<ulongT>::vector(arg3).move_to(_opcode); ++arg2; }
-                  s = ns;
-                }
-              if (arg1==~0U) arg1 = arg2;
-              _cimg_mp_check_vector0(arg1);
-              pos = vector(arg1);
-              _opcode.insert(CImg<ulongT>::vector((ulongT)mp_vector_init,pos,0,arg1),0);
-              (_opcode>'y').move_to(opcode);
-              opcode[2] = opcode._height;
-              opcode.move_to(code);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'w' :
-            if (!std::strncmp(ss,"w(",2)) { // Image width
-              _cimg_mp_op("Function 'w()'");
-              if (*ss2=='#') { p1 = compile(ss3,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss2!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_w,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"wh(",3)) { // Image width*height
-              _cimg_mp_op("Function 'wh()'");
-              if (*ss3=='#') { p1 = compile(ss4,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss3!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_wh,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"whd(",4)) { // Image width*height*depth
-              _cimg_mp_op("Function 'whd()'");
-              if (*ss4=='#') { p1 = compile(ss5,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss4!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_whd,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"whds(",5)) { // Image width*height*depth*spectrum
-              _cimg_mp_op("Function 'whds()'");
-              if (*ss5=='#') { p1 = compile(ss6,se1,depth1,0); _cimg_mp_check_list(false); } // Index specified
-              else { if (ss5!=se1) break; p1 = ~0U; }
-              pos = scalar();
-              CImg<ulongT>::vector((ulongT)mp_image_whds,pos,p1).move_to(code);
-              _cimg_mp_return(pos);
-            }
-
-            if (!std::strncmp(ss,"while(",6) || !std::strncmp(ss,"whiledo(",8)) { // While...do
-              _cimg_mp_op("Function 'whiledo()'");
-              s0 = *ss5=='('?ss6:ss8;
-              s1 = s0; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              p1 = code._width;
-              arg1 = compile(s0,s1,depth1,0);
-              p2 = code._width;
-              arg6 = mempos;
-              pos = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg1,1,1,0);
-              arg2 = _cimg_mp_vector_size(pos);
-              CImg<ulongT>::vector((ulongT)mp_whiledo,pos,arg1,p2 - p1,code._width - p2,arg2,
-                                   pos>=arg6 && !_cimg_mp_is_constant(pos),
-                                   arg1>=arg6 && !_cimg_mp_is_constant(arg1)).move_to(code,p1);
-              _cimg_mp_return(pos);
-            }
-            break;
-
-          case 'x' :
-            if (!std::strncmp(ss,"xor(",4)) { // Xor
-              _cimg_mp_op("Function 'xor()'");
-              s1 = ss4; while (s1<se1 && (*s1!=',' || level[s1 - expr._data]!=clevel1)) ++s1;
-              arg1 = compile(ss4,s1,depth1,0);
-              arg2 = compile(++s1,se1,depth1,0);
-              _cimg_mp_check_type(arg2,2,3,_cimg_mp_vector_size(arg1));
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_vv(mp_bitwise_xor,arg1,arg2);
-              if (_cimg_mp_is_vector(arg1) && _cimg_mp_is_scalar(arg2)) _cimg_mp_vector2_vs(mp_bitwise_xor,arg1,arg2);
-              if (_cimg_mp_is_scalar(arg1) && _cimg_mp_is_vector(arg2)) _cimg_mp_vector2_sv(mp_bitwise_xor,arg1,arg2);
-              if (_cimg_mp_is_constant(arg1) && _cimg_mp_is_constant(arg2))
-                _cimg_mp_constant((longT)mem[arg1] ^ (longT)mem[arg2]);
-              _cimg_mp_scalar2(mp_bitwise_xor,arg1,arg2);
-            }
-            break;
-
-          }
-
-          if (!std::strncmp(ss,"min(",4) || !std::strncmp(ss,"max(",4) ||
-              !std::strncmp(ss,"med(",4) || !std::strncmp(ss,"kth(",4) ||
-              !std::strncmp(ss,"sum(",4) ||
-              !std::strncmp(ss,"std(",4) || !std::strncmp(ss,"variance(",9) ||
-              !std::strncmp(ss,"prod(",5) || !std::strncmp(ss,"mean(",5) ||
-              !std::strncmp(ss,"argmin(",7) || !std::strncmp(ss,"argmax(",7)) { // Multi-argument functions
-            _cimg_mp_op(*ss=='a'?(ss[3]=='('?"Function 'arg()'":ss[4]=='i'?"Function 'argmin()'":
-                                  "Function 'argmax()'"):
-                        *ss=='s'?(ss[1]=='u'?"Function 'sum()'":"Function 'std()'"):
-                        *ss=='k'?"Function 'kth()'":
-                        *ss=='p'?"Function 'prod()'":
-                        *ss=='v'?"Function 'variance()'":
-                        ss[1]=='i'?"Function 'min()'":
-                        ss[1]=='a'?"Function 'max()'":
-                        ss[2]=='a'?"Function 'mean()'":"Function 'med()'");
-            op = *ss=='a'?(ss[3]=='('?mp_arg:ss[4]=='i'?mp_argmin:mp_argmax):
-              *ss=='s'?(ss[1]=='u'?mp_sum:mp_std):
-              *ss=='k'?mp_kth:
-              *ss=='p'?mp_prod:
-              *ss=='v'?mp_variance:
-              ss[1]=='i'?mp_min:
-              ss[1]=='a'?mp_max:
-              ss[2]=='a'?mp_mean:
-              mp_median;
-            is_sth = true; // Tell if all arguments are constant
-            pos = scalar();
-            CImg<ulongT>::vector((ulongT)op,pos,0).move_to(_opcode);
-            for (s = std::strchr(ss,'(') + 1; s<se; ++s) {
-              ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                             (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-              arg2 = compile(s,ns,depth1,0);
-              if (_cimg_mp_is_vector(arg2))
-                CImg<ulongT>::sequence(_cimg_mp_vector_size(arg2),arg2 + 1,
-                                       arg2 + (ulongT)_cimg_mp_vector_size(arg2)).
-                  move_to(_opcode);
-              else CImg<ulongT>::vector(arg2).move_to(_opcode);
-              is_sth&=_cimg_mp_is_constant(arg2);
-              s = ns;
-            }
-            (_opcode>'y').move_to(opcode);
-            opcode[2] = opcode._height;
-            if (is_sth) _cimg_mp_constant(op(*this));
-            opcode.move_to(code);
-            _cimg_mp_return(pos);
-          }
-
-          // No corresponding built-in function -> Look for a user-defined macro call.
-          s0 = strchr(ss,'(');
-          if (s0) {
-            variable_name.assign(ss,(unsigned int)(s0 - ss + 1)).back() = 0;
-
-            // Count number of specified arguments.
-            p1 = 0;
-            for (s = s0 + 1; s<=se1; ++p1, s = ns + 1) {
-              while (*s && (signed char)*s<=' ') ++s;
-              if (*s==')' && !p1) break;
-              ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                             (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-            }
-
-            arg3 = 0; // Number of possible name matches
-            cimglist_for(macro_def,l) if (!std::strcmp(macro_def[l],variable_name) && ++arg3 &&
-                                          macro_def[l].back()==(char)p1) {
-              p2 = (unsigned int)macro_def[l].back(); // Number of required arguments
-              CImg<charT> _expr = macro_body[l]; // Expression to be substituted
-
-              p1 = 1; // Indice of current parsed argument
-              for (s = s0 + 1; s<=se1; ++p1, s = ns + 1) { // Parse function arguments
-                while (*s && (signed char)*s<=' ') ++s;
-                if (*s==')' && p1==1) break; // Function has no arguments
-                if (p1>p2) { ++p1; break; }
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=')' || level[ns - expr._data]!=clevel)) ++ns;
-                variable_name.assign(s,(unsigned int)(ns - s + 1)).back() = 0; // Argument to write
-                arg2 = 0;
-                cimg_forX(_expr,k) {
-                  if (_expr[k]==(char)p1) { // Perform argument substitution
-                    arg1 = _expr._width;
-                    _expr.resize(arg1 + variable_name._width - 2,1,1,1,0);
-                    std::memmove(_expr._data + k + variable_name._width - 1,_expr._data + k + 1,arg1 - k - 1);
-                    std::memcpy(_expr._data + k,variable_name,variable_name._width - 1);
-                    k+=variable_name._width - 2;
-                  }
-                  ++arg2;
-                }
-              }
-
-              // Recompute 'pexpr' and 'level' for evaluating substituted expression.
-              CImg<charT> _pexpr(_expr._width);
-              ns = _pexpr._data;
-              for (ps = _expr._data, c1 = ' '; *ps; ++ps) {
-                if ((signed char)*ps>' ') c1 = *ps;
-                *(ns++) = c1;
-              }
-              *ns = 0;
-
-              CImg<uintT> _level = get_level(_expr);
-              expr.swap(_expr);
-              pexpr.swap(_pexpr);
-              level.swap(_level);
-              s0 = user_macro;
-              user_macro = macro_def[l];
-              pos = compile(expr._data,expr._data + expr._width - 1,depth1,p_ref);
-              user_macro = s0;
-              level.swap(_level);
-              pexpr.swap(_pexpr);
-              expr.swap(_expr);
-              _cimg_mp_return(pos);
-            }
-
-            if (arg3) { // Macro name matched but number of arguments does not
-              CImg<uintT> sig_nargs(arg3);
-              arg1 = 0;
-              cimglist_for(macro_def,l) if (!std::strcmp(macro_def[l],variable_name))
-                sig_nargs[arg1++] = (unsigned int)macro_def[l].back();
-              *se = saved_char;
-              cimg::strellipsize(variable_name,64);
-              s0 = ss - 4>expr._data?ss - 4:expr._data;
-              cimg::strellipsize(s0,64);
-              if (sig_nargs._width>1) {
-                sig_nargs.sort();
-                arg1 = sig_nargs.back();
-                --sig_nargs._width;
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: Function '%s()': Number of specified arguments (%u) "
-                                            "does not match macro declaration (defined for %s or %u arguments), "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,variable_name._data,
-                                            p1,sig_nargs.value_string()._data,arg1,
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-              } else
-                throw CImgArgumentException("[_cimg_math_parser] "
-                                            "CImg<%s>::%s: Function '%s()': Number of specified arguments (%u) "
-                                            "does not match macro declaration (defined for %u argument%s), "
-                                            "in expression '%s%s%s'.",
-                                            pixel_type(),_cimg_mp_calling_function,variable_name._data,
-                                            p1,*sig_nargs,*sig_nargs!=1?"s":"",
-                                            s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-            }
-          }
-        } // if (se1==')')
-
-        // Char / string initializer.
-        if (*se1=='\'' &&
-            ((se1>ss && *ss=='\'') ||
-            (se1>ss1 && *ss=='_' && *ss1=='\''))) {
-          if (*ss=='_') { _cimg_mp_op("Char initializer"); s1 = ss2; }
-          else { _cimg_mp_op("String initializer"); s1 = ss1; }
-          arg1 = (unsigned int)(se1 - s1); // Original string length.
-          if (arg1) {
-            CImg<charT>(s1,arg1 + 1).move_to(variable_name).back() = 0;
-            cimg::strunescape(variable_name);
-            arg1 = (unsigned int)std::strlen(variable_name);
-          }
-          if (!arg1) _cimg_mp_return(0); // Empty string -> 0
-          if (*ss=='_') {
-            if (arg1==1) _cimg_mp_constant(*variable_name);
-            *se = saved_char;
-            cimg::strellipsize(variable_name,64);
-            s0 = ss - 4>expr._data?ss - 4:expr._data;
-            cimg::strellipsize(s0,64);
-            throw CImgArgumentException("[_cimg_math_parser] "
-                                        "CImg<%s>::%s: %s: Literal %s contains more than one character, "
-                                        "in expression '%s%s%s'.",
-                                        pixel_type(),_cimg_mp_calling_function,s_op,
-                                        ss1,
-                                        s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-          }
-          pos = vector(arg1);
-          CImg<ulongT>::vector((ulongT)mp_string_init,pos,arg1).move_to(_opcode);
-          CImg<ulongT>(1,arg1/sizeof(ulongT) + (arg1%sizeof(ulongT)?1:0)).move_to(_opcode);
-          std::memcpy((char*)_opcode[1]._data,variable_name,arg1);
-          (_opcode>'y').move_to(code);
-          _cimg_mp_return(pos);
-        }
-
-        // Vector initializer [ ... ].
-        if (*ss=='[' && *se1==']') {
-          _cimg_mp_op("Vector initializer");
-          s1 = ss1; while (s1<se2 && (signed char)*s1<=' ') ++s1;
-          s2 = se2; while (s2>s1 && (signed char)*s2<=' ') --s2;
-          if (s2>s1 && *s1=='\'' && *s2=='\'') { // Vector values provided as a string
-            arg1 = (unsigned int)(s2 - s1 - 1); // Original string length.
-            if (arg1) {
-              CImg<charT>(s1 + 1,arg1 + 1).move_to(variable_name).back() = 0;
-              cimg::strunescape(variable_name);
-              arg1 = (unsigned int)std::strlen(variable_name);
-            }
-            if (!arg1) _cimg_mp_return(0); // Empty string -> 0
-            pos = vector(arg1);
-            CImg<ulongT>::vector((ulongT)mp_string_init,pos,arg1).move_to(_opcode);
-            CImg<ulongT>(1,arg1/sizeof(ulongT) + (arg1%sizeof(ulongT)?1:0)).move_to(_opcode);
-            std::memcpy((char*)_opcode[1]._data,variable_name,arg1);
-            (_opcode>'y').move_to(code);
-          } else { // Vector values provided as list of items
-            arg1 = 0; // Number of specified values.
-            if (*ss1!=']') for (s = ss1; s<se; ++s) {
-                ns = s; while (ns<se && (*ns!=',' || level[ns - expr._data]!=clevel1) &&
-                               (*ns!=']' || level[ns - expr._data]!=clevel)) ++ns;
-                arg2 = compile(s,ns,depth1,0);
-                if (_cimg_mp_is_vector(arg2)) {
-                  arg3 = _cimg_mp_vector_size(arg2);
-                  CImg<ulongT>::sequence(arg3,arg2 + 1,arg2 + arg3).move_to(_opcode);
-                  arg1+=arg3;
-                } else { CImg<ulongT>::vector(arg2).move_to(_opcode); ++arg1; }
-                s = ns;
-              }
-            _cimg_mp_check_vector0(arg1);
-            pos = vector(arg1);
-            _opcode.insert(CImg<ulongT>::vector((ulongT)mp_vector_init,pos,0,arg1),0);
-            (_opcode>'y').move_to(opcode);
-            opcode[2] = opcode._height;
-            opcode.move_to(code);
-          }
-          _cimg_mp_return(pos);
-        }
-
-        // Variables related to the input list of images.
-        if (*ss1=='#' && ss2<se) {
-          arg1 = compile(ss2,se,depth1,0);
-          p1 = (unsigned int)(listin._width && _cimg_mp_is_constant(arg1)?cimg::mod((int)mem[arg1],listin.width()):~0U);
-          switch (*ss) {
-          case 'w' : // w#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._width);
-            _cimg_mp_scalar1(mp_list_width,arg1);
-          case 'h' : // h#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._height);
-            _cimg_mp_scalar1(mp_list_height,arg1);
-          case 'd' : // d#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._depth);
-            _cimg_mp_scalar1(mp_list_depth,arg1);
-          case 'r' : // r#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._is_shared);
-            _cimg_mp_scalar1(mp_list_is_shared,arg1);
-          case 's' : // s#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._spectrum);
-            _cimg_mp_scalar1(mp_list_spectrum,arg1);
-          case 'i' : // i#ind
-            if (!listin) _cimg_mp_return(0);
-            _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,_cimg_mp_slot_c,
-                             0,_cimg_mp_boundary);
-          case 'I' : // I#ind
-            p2 = p1!=~0U?listin[p1]._spectrum:listin._width?~0U:0;
-            _cimg_mp_check_vector0(p2);
-            pos = vector(p2);
-            CImg<ulongT>::vector((ulongT)mp_list_Joff,pos,p1,0,0,p2).move_to(code);
-            _cimg_mp_return(pos);
-          case 'R' : // R#ind
-            if (!listin) _cimg_mp_return(0);
-            _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,0,
-                             0,_cimg_mp_boundary);
-          case 'G' : // G#ind
-            if (!listin) _cimg_mp_return(0);
-            _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,1,
-                             0,_cimg_mp_boundary);
-          case 'B' : // B#ind
-            if (!listin) _cimg_mp_return(0);
-            _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,2,
-                             0,_cimg_mp_boundary);
-          case 'A' : // A#ind
-            if (!listin) _cimg_mp_return(0);
-            _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,3,
-                             0,_cimg_mp_boundary);
-          }
-        }
-
-        if (*ss1 && *ss2=='#' && ss3<se) {
-          arg1 = compile(ss3,se,depth1,0);
-          p1 = (unsigned int)(listin._width && _cimg_mp_is_constant(arg1)?cimg::mod((int)mem[arg1],listin.width()):~0U);
-          if (*ss=='w' && *ss1=='h') { // wh#ind
-            if (!listin) _cimg_mp_return(0);
-            if (p1!=~0U) _cimg_mp_constant(listin[p1]._width*listin[p1]._height);
-            _cimg_mp_scalar1(mp_list_wh,arg1);
-          }
-          arg2 = ~0U;
-
-          if (*ss=='i') {
-            if (*ss1=='c') { // ic#ind
-              if (!listin) _cimg_mp_return(0);
-              if (_cimg_mp_is_constant(arg1)) {
-                if (!list_median) list_median.assign(listin._width);
-                if (!list_median[p1]) CImg<doubleT>::vector(listin[p1].median()).move_to(list_median[p1]);
-                _cimg_mp_constant(*list_median[p1]);
-              }
-              _cimg_mp_scalar1(mp_list_median,arg1);
-            }
-            if (*ss1>='0' && *ss1<='9') { // i0#ind...i9#ind
-              if (!listin) _cimg_mp_return(0);
-              _cimg_mp_scalar7(mp_list_ixyzc,arg1,_cimg_mp_slot_x,_cimg_mp_slot_y,_cimg_mp_slot_z,*ss1 - '0',
-                               0,_cimg_mp_boundary);
-            }
-            switch (*ss1) {
-            case 'm' : arg2 = 0; break; // im#ind
-            case 'M' : arg2 = 1; break; // iM#ind
-            case 'a' : arg2 = 2; break; // ia#ind
-            case 'v' : arg2 = 3; break; // iv#ind
-            case 's' : arg2 = 12; break; // is#ind
-            case 'p' : arg2 = 13; break; // ip#ind
-            }
-          } else if (*ss1=='m') switch (*ss) {
-            case 'x' : arg2 = 4; break; // xm#ind
-            case 'y' : arg2 = 5; break; // ym#ind
-            case 'z' : arg2 = 6; break; // zm#ind
-            case 'c' : arg2 = 7; break; // cm#ind
-            } else if (*ss1=='M') switch (*ss) {
-            case 'x' : arg2 = 8; break; // xM#ind
-            case 'y' : arg2 = 9; break; // yM#ind
-            case 'z' : arg2 = 10; break; // zM#ind
-            case 'c' : arg2 = 11; break; // cM#ind
-            }
-          if (arg2!=~0U) {
-            if (!listin) _cimg_mp_return(0);
-            if (_cimg_mp_is_constant(arg1)) {
-              if (!list_stats) list_stats.assign(listin._width);
-              if (!list_stats[p1]) list_stats[p1].assign(1,14,1,1,0).fill(listin[p1].get_stats(),false);
-              _cimg_mp_constant(list_stats(p1,arg2));
-            }
-            _cimg_mp_scalar2(mp_list_stats,arg1,arg2);
-          }
-        }
-
-        if (*ss=='w' && *ss1=='h' && *ss2=='d' && *ss3=='#' && ss4<se) { // whd#ind
-          arg1 = compile(ss4,se,depth1,0);
-          if (!listin) _cimg_mp_return(0);
-          p1 = (unsigned int)(_cimg_mp_is_constant(arg1)?cimg::mod((int)mem[arg1],listin.width()):~0U);
-          if (p1!=~0U) _cimg_mp_constant(listin[p1]._width*listin[p1]._height*listin[p1]._depth);
-          _cimg_mp_scalar1(mp_list_whd,arg1);
-        }
-        if (*ss=='w' && *ss1=='h' && *ss2=='d' && *ss3=='s' && *ss4=='#' && ss5<se) { // whds#ind
-          arg1 = compile(ss5,se,depth1,0);
-          if (!listin) _cimg_mp_return(0);
-          p1 = (unsigned int)(_cimg_mp_is_constant(arg1)?cimg::mod((int)mem[arg1],listin.width()):~0U);
-          if (p1!=~0U) _cimg_mp_constant(listin[p1]._width*listin[p1]._height*listin[p1]._depth*listin[p1]._spectrum);
-          _cimg_mp_scalar1(mp_list_whds,arg1);
-        }
-
-        if (!std::strcmp(ss,"interpolation")) _cimg_mp_return(_cimg_mp_interpolation); // interpolation
-        if (!std::strcmp(ss,"boundary")) _cimg_mp_return(_cimg_mp_boundary); // boundary
-
-        // No known item found, assuming this is an already initialized variable.
-        variable_name.assign(ss,(unsigned int)(se - ss + 1)).back() = 0;
-        if (variable_name[1]) { // Multi-char variable
-          cimglist_for(variable_def,i) if (!std::strcmp(variable_name,variable_def[i]))
-            _cimg_mp_return(variable_pos[i]);
-        } else if (reserved_label[*variable_name]!=~0U) // Single-char variable
-          _cimg_mp_return(reserved_label[*variable_name]);
-
-        // Reached an unknown item -> error.
-        is_sth = true; // is_valid_variable_name
-        if (*variable_name>='0' && *variable_name<='9') is_sth = false;
-        else for (ns = variable_name._data; *ns; ++ns)
-               if (!is_varchar(*ns)) { is_sth = false; break; }
-
-        *se = saved_char;
-        c1 = *se1;
-        cimg::strellipsize(variable_name,64);
-        s0 = ss - 4>expr._data?ss - 4:expr._data;
-        cimg::strellipsize(s0,64);
-        if (is_sth)
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: Undefined variable '%s' in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,
-                                      variable_name._data,
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        s1 = std::strchr(ss,'(');
-        s_op = s1 && c1==')'?"function call":"item";
-        throw CImgArgumentException("[_cimg_math_parser] "
-                                    "CImg<%s>::%s: Unrecognized %s '%s' in expression '%s%s%s'.",
-                                    pixel_type(),_cimg_mp_calling_function,
-                                    s_op,variable_name._data,
-                                    s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-      }
-
-      // Evaluation procedure.
-      double operator()(const double x, const double y, const double z, const double c) {
-        mem[_cimg_mp_slot_x] = x; mem[_cimg_mp_slot_y] = y; mem[_cimg_mp_slot_z] = z; mem[_cimg_mp_slot_c] = c;
-        for (p_code = code; p_code<p_code_end; ++p_code) {
-          opcode._data = p_code->_data;
-          const ulongT target = opcode[1];
-          mem[target] = _cimg_mp_defunc(*this);
-        }
-        return *result;
-      }
-
-      // Evaluation procedure (return output values in vector 'output').
-      template<typename t>
-      void operator()(const double x, const double y, const double z, const double c, t *const output) {
-        mem[_cimg_mp_slot_x] = x; mem[_cimg_mp_slot_y] = y; mem[_cimg_mp_slot_z] = z; mem[_cimg_mp_slot_c] = c;
-        for (p_code = code; p_code<p_code_end; ++p_code) {
-          opcode._data = p_code->_data;
-          const ulongT target = opcode[1];
-          mem[target] = _cimg_mp_defunc(*this);
-        }
-        if (result_dim) {
-          const double *ptrs = result + 1;
-          t *ptrd = output;
-          for (unsigned int k = 0; k<result_dim; ++k) *(ptrd++) = (t)*(ptrs++);
-        } else *output = (t)*result;
-      }
-
-      // Evaluation procedure for the end() blocks.
-      void end() {
-        if (code_end.is_empty()) return;
-        if (imgin) {
-          mem[_cimg_mp_slot_x] = imgin._width - 1.0;
-          mem[_cimg_mp_slot_y] = imgin._height - 1.0f;
-          mem[_cimg_mp_slot_z] = imgin._depth - 1.0f;
-          mem[_cimg_mp_slot_c] = imgin._spectrum - 1.0f;
-        } else mem[_cimg_mp_slot_x] = mem[_cimg_mp_slot_y] = mem[_cimg_mp_slot_z] = mem[_cimg_mp_slot_c] = 0;
-        p_code_end = code_end.end();
-        for (p_code = code_end; p_code<p_code_end; ++p_code) {
-          opcode._data = p_code->_data;
-          const ulongT target = opcode[1];
-          mem[target] = _cimg_mp_defunc(*this);
-        }
-      }
-
-      // Return type of a memory element as a string.
-      CImg<charT> s_type(const unsigned int arg) const {
-        CImg<charT> res;
-        if (_cimg_mp_is_vector(arg)) { // Vector
-          CImg<charT>::string("vectorXXXXXXXXXXXXXXXX").move_to(res);
-          std::sprintf(res._data + 6,"%u",_cimg_mp_vector_size(arg));
-        } else CImg<charT>::string("scalar").move_to(res);
-        return res;
-      }
-
-      // Insert constant value in memory.
-      unsigned int constant(const double val) {
-
-        // Search for built-in constant.
-        if (val==(double)(int)val) {
-          if (val>=0 && val<=10) return (unsigned int)val;
-          if (val<0 && val>=-5) return (unsigned int)(10 - val);
-        }
-        if (val==0.5) return 16;
-        if (cimg::type<double>::is_nan(val)) return _cimg_mp_slot_nan;
-
-        // Search for constant already requested before (in const cache).
-        unsigned int ind = ~0U;
-        if (constcache_size<1024) {
-          if (!constcache_size) {
-            constcache_vals.assign(16,1,1,1,0);
-            constcache_inds.assign(16,1,1,1,0);
-            *constcache_vals = val;
-            constcache_size = 1;
-            ind = 0;
-          } else { // Dichotomic search
-            const double val_beg = *constcache_vals, val_end = constcache_vals[constcache_size - 1];
-            if (val_beg>=val) ind = 0;
-            else if (val_end==val) ind = constcache_size - 1;
-            else if (val_end<val) ind = constcache_size;
-            else {
-              unsigned int i0 = 1, i1 = constcache_size - 2;
-              while (i0<=i1) {
-                const unsigned int mid = (i0 + i1)/2;
-                if (constcache_vals[mid]==val) { i0 = mid; break; }
-                else if (constcache_vals[mid]<val) i0 = mid + 1;
-                else i1 = mid - 1;
-              }
-              ind = i0;
-            }
-
-            if (ind>=constcache_size || constcache_vals[ind]!=val) {
-              ++constcache_size;
-              if (constcache_size>constcache_vals._width) {
-                constcache_vals.resize(-200,1,1,1,0);
-                constcache_inds.resize(-200,1,1,1,0);
-              }
-              const int l = constcache_size - (int)ind - 1;
-              if (l>0) {
-                std::memmove(&constcache_vals[ind + 1],&constcache_vals[ind],l*sizeof(double));
-                std::memmove(&constcache_inds[ind + 1],&constcache_inds[ind],l*sizeof(unsigned int));
-              }
-              constcache_vals[ind] = val;
-              constcache_inds[ind] = 0;
-            }
-          }
-          if (constcache_inds[ind]) return constcache_inds[ind];
-        }
-
-        // Insert new constant in memory if necessary.
-        if (mempos>=mem._width) { mem.resize(-200,1,1,1,0); memtype.resize(-200,1,1,1,0); }
-        const unsigned int pos = mempos++;
-        mem[pos] = val;
-        memtype[pos] = 1; // Set constant property
-        if (ind!=~0U) constcache_inds[ind] = pos;
-        return pos;
-      }
-
-      // Insert code instructions for processing scalars.
-      unsigned int scalar() { // Insert new scalar in memory.
-        if (mempos>=mem._width) { mem.resize(-200,1,1,1,0); memtype.resize(mem._width,1,1,1,0); }
-        return mempos++;
-      }
-
-      unsigned int scalar0(const mp_func op) {
-        const unsigned int pos = scalar();
-        CImg<ulongT>::vector((ulongT)op,pos).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar1(const mp_func op, const unsigned int arg1) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1) && op!=mp_copy?arg1:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar2(const mp_func op, const unsigned int arg1, const unsigned int arg2) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar3(const mp_func op,
-                           const unsigned int arg1, const unsigned int arg2, const unsigned int arg3) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:
-          arg3>_cimg_mp_slot_c && _cimg_mp_is_comp(arg3)?arg3:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2,arg3).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar4(const mp_func op,
-                           const unsigned int arg1, const unsigned int arg2, const unsigned int arg3,
-                           const unsigned int arg4) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:
-          arg3>_cimg_mp_slot_c && _cimg_mp_is_comp(arg3)?arg3:
-          arg4>_cimg_mp_slot_c && _cimg_mp_is_comp(arg4)?arg4:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2,arg3,arg4).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar5(const mp_func op,
-                           const unsigned int arg1, const unsigned int arg2, const unsigned int arg3,
-                           const unsigned int arg4, const unsigned int arg5) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:
-          arg3>_cimg_mp_slot_c && _cimg_mp_is_comp(arg3)?arg3:
-          arg4>_cimg_mp_slot_c && _cimg_mp_is_comp(arg4)?arg4:
-          arg5>_cimg_mp_slot_c && _cimg_mp_is_comp(arg5)?arg5:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2,arg3,arg4,arg5).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar6(const mp_func op,
-                           const unsigned int arg1, const unsigned int arg2, const unsigned int arg3,
-                           const unsigned int arg4, const unsigned int arg5, const unsigned int arg6) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:
-          arg3>_cimg_mp_slot_c && _cimg_mp_is_comp(arg3)?arg3:
-          arg4>_cimg_mp_slot_c && _cimg_mp_is_comp(arg4)?arg4:
-          arg5>_cimg_mp_slot_c && _cimg_mp_is_comp(arg5)?arg5:
-          arg6>_cimg_mp_slot_c && _cimg_mp_is_comp(arg6)?arg6:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2,arg3,arg4,arg5,arg6).move_to(code);
-        return pos;
-      }
-
-      unsigned int scalar7(const mp_func op,
-                           const unsigned int arg1, const unsigned int arg2, const unsigned int arg3,
-                           const unsigned int arg4, const unsigned int arg5, const unsigned int arg6,
-                           const unsigned int arg7) {
-        const unsigned int pos =
-          arg1>_cimg_mp_slot_c && _cimg_mp_is_comp(arg1)?arg1:
-          arg2>_cimg_mp_slot_c && _cimg_mp_is_comp(arg2)?arg2:
-          arg3>_cimg_mp_slot_c && _cimg_mp_is_comp(arg3)?arg3:
-          arg4>_cimg_mp_slot_c && _cimg_mp_is_comp(arg4)?arg4:
-          arg5>_cimg_mp_slot_c && _cimg_mp_is_comp(arg5)?arg5:
-          arg6>_cimg_mp_slot_c && _cimg_mp_is_comp(arg6)?arg6:
-          arg7>_cimg_mp_slot_c && _cimg_mp_is_comp(arg7)?arg7:scalar();
-        CImg<ulongT>::vector((ulongT)op,pos,arg1,arg2,arg3,arg4,arg5,arg6,arg7).move_to(code);
-        return pos;
-      }
-
-      // Return a string that defines the calling function + the user-defined function scope.
-      CImg<charT> calling_function_s() const {
-        CImg<charT> res;
-        const unsigned int
-          l1 = calling_function?(unsigned int)std::strlen(calling_function):0U,
-          l2 = user_macro?(unsigned int)std::strlen(user_macro):0U;
-        if (l2) {
-          res.assign(l1 + l2 + 48);
-          cimg_snprintf(res,res._width,"%s(): When substituting function '%s()'",calling_function,user_macro);
-        } else {
-          res.assign(l1 + l2 + 4);
-          cimg_snprintf(res,res._width,"%s()",calling_function);
-        }
-        return res;
-      }
-
-      // Return true if specified argument can be a part of an allowed  variable name.
-      bool is_varchar(const char c) const {
-        return (c>='a' && c<='z') || (c>='A' && c<='Z') || (c>='0' && c<='9') || c=='_';
-      }
-
-      // Insert code instructions for processing vectors.
-      bool is_comp_vector(const unsigned int arg) const {
-        unsigned int siz = _cimg_mp_vector_size(arg);
-        if (siz>8) return false;
-        const int *ptr = memtype.data(arg + 1);
-        bool is_tmp = true;
-        while (siz-->0) if (*(ptr++)) { is_tmp = false; break; }
-        return is_tmp;
-      }
-
-      void set_variable_vector(const unsigned int arg) {
-        unsigned int siz = _cimg_mp_vector_size(arg);
-        int *ptr = memtype.data(arg + 1);
-        while (siz-->0) *(ptr++) = -1;
-      }
-
-      unsigned int vector(const unsigned int siz) { // Insert new vector of specified size in memory
-        if (mempos + siz>=mem._width) {
-          mem.resize(2*mem._width + siz,1,1,1,0);
-          memtype.resize(mem._width,1,1,1,0);
-        }
-        const unsigned int pos = mempos++;
-        mem[pos] = cimg::type<double>::nan();
-        memtype[pos] = siz + 1;
-        mempos+=siz;
-        return pos;
-      }
-
-      unsigned int vector(const unsigned int siz, const double value) { // Insert new initialized vector
-        const unsigned int pos = vector(siz);
-        double *ptr = &mem[pos] + 1;
-        for (unsigned int i = 0; i<siz; ++i) *(ptr++) = value;
-        return pos;
-      }
-
-      unsigned int vector_copy(const unsigned int arg) { // Insert new copy of specified vector in memory
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg),
-          pos = vector(siz);
-        CImg<ulongT>::vector((ulongT)mp_vector_copy,pos,arg,siz).move_to(code);
-        return pos;
-      }
-
-      void self_vector_s(const unsigned int pos, const mp_func op, const unsigned int arg1) {
-        const unsigned int siz = _cimg_mp_vector_size(pos);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_self_map_vector_s,pos,siz,(ulongT)op,arg1).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1).move_to(code[code._width - 1 - siz + k]);
-        }
-      }
-
-      void self_vector_v(const unsigned int pos, const mp_func op, const unsigned int arg1) {
-        const unsigned int siz = _cimg_mp_vector_size(pos);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_self_map_vector_v,pos,siz,(ulongT)op,arg1).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1 + k).move_to(code[code._width - 1 - siz + k]);
-        }
-      }
-
-      unsigned int vector1_v(const mp_func op, const unsigned int arg1) {
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg1),
-          pos = is_comp_vector(arg1)?arg1:vector(siz);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_vector_map_v,pos,siz,(ulongT)op,arg1).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1 + k).move_to(code[code._width - 1 - siz + k]);
-        }
-        return pos;
-      }
-
-      unsigned int vector2_vv(const mp_func op, const unsigned int arg1, const unsigned int arg2) {
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg1),
-          pos = is_comp_vector(arg1)?arg1:is_comp_vector(arg2)?arg2:vector(siz);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_vector_map_vv,pos,siz,(ulongT)op,arg1,arg2).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1 + k,arg2 + k).move_to(code[code._width - 1 - siz + k]);
-        }
-        return pos;
-      }
-
-      unsigned int vector2_vs(const mp_func op, const unsigned int arg1, const unsigned int arg2) {
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg1),
-          pos = is_comp_vector(arg1)?arg1:vector(siz);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_vector_map_vs,pos,siz,(ulongT)op,arg1,arg2).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1 + k,arg2).move_to(code[code._width - 1 - siz + k]);
-        }
-        return pos;
-      }
-
-      unsigned int vector2_sv(const mp_func op, const unsigned int arg1, const unsigned int arg2) {
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg2),
-          pos = is_comp_vector(arg2)?arg2:vector(siz);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_vector_map_sv,pos,siz,(ulongT)op,arg1,arg2).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1,arg2 + k).move_to(code[code._width - 1 - siz + k]);
-        }
-        return pos;
-      }
-
-      unsigned int vector3_vss(const mp_func op, const unsigned int arg1, const unsigned int arg2,
-                               const unsigned int arg3) {
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg1),
-          pos = is_comp_vector(arg1)?arg1:vector(siz);
-        if (siz>24) CImg<ulongT>::vector((ulongT)mp_vector_map_vss,pos,siz,(ulongT)op,arg1,arg2,arg3).move_to(code);
-        else {
-          code.insert(siz);
-          for (unsigned int k = 1; k<=siz; ++k)
-            CImg<ulongT>::vector((ulongT)op,pos + k,arg1 + k,arg2,arg3).move_to(code[code._width - 1 - siz + k]);
-        }
-        return pos;
-      }
-
-      // Check if a memory slot is a positive integer constant scalar value.
-      // 'mode' can be:
-      // { 0=constant | 1=integer constant | 2=positive integer constant | 3=strictly-positive integer constant }
-      void check_constant(const unsigned int arg, const unsigned int n_arg,
-                          const unsigned int mode,
-                          char *const ss, char *const se, const char saved_char) {
-        _cimg_mp_check_type(arg,n_arg,1,0);
-        if (!(_cimg_mp_is_constant(arg) &&
-              (!mode || (double)(int)mem[arg]==mem[arg]) &&
-              (mode<2 || mem[arg]>=(mode==3)))) {
-          const char *s_arg = !n_arg?"":n_arg==1?"First ":n_arg==2?"Second ":n_arg==3?"Third ":
-            n_arg==4?"Fourth ":n_arg==5?"Fifth ":n_arg==6?"Sixth ":n_arg==7?"Seventh ":n_arg==8?"Eighth ":
-            n_arg==9?"Ninth ":"One of the ";
-          *se = saved_char;
-          char *const s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s %s%s (of type '%s') is not a%s constant, "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s_arg,*s_arg?"argument":"Argument",s_type(arg)._data,
-                                      !mode?"":mode==1?"n integer":
-                                      mode==2?" positive integer":" strictly positive integer",
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-      }
-
-      // Check a matrix is square.
-      void check_matrix_square(const unsigned int arg, const unsigned int n_arg,
-                               char *const ss, char *const se, const char saved_char) {
-        _cimg_mp_check_type(arg,n_arg,2,0);
-        const unsigned int
-          siz = _cimg_mp_vector_size(arg),
-          n = (unsigned int)std::sqrt((float)siz);
-        if (n*n!=siz) {
-          const char *s_arg;
-          if (*s_op!='F') s_arg = !n_arg?"":n_arg==1?"Left-hand ":"Right-hand ";
-          else s_arg = !n_arg?"":n_arg==1?"First ":n_arg==2?"Second ":n_arg==3?"Third ":"One ";
-          *se = saved_char;
-          char *const s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s %s%s (of type '%s') "
-                                      "cannot be considered as a square matrix, in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s_arg,*s_op=='F'?(*s_arg?"argument":"Argument"):(*s_arg?"operand":"Operand"),
-                                      s_type(arg)._data,
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-      }
-
-      // Check type compatibility for one argument.
-      // Bits of 'mode' tells what types are allowed:
-      // { 1 = scalar | 2 = vectorN }.
-      // If 'N' is not zero, it also restricts the vectors to be of size N only.
-      void check_type(const unsigned int arg, const unsigned int n_arg,
-                      const unsigned int mode, const unsigned int N,
-                      char *const ss, char *const se, const char saved_char) {
-        const bool
-          is_scalar = _cimg_mp_is_scalar(arg),
-          is_vector = _cimg_mp_is_vector(arg) && (!N || _cimg_mp_vector_size(arg)==N);
-        bool cond = false;
-        if (mode&1) cond|=is_scalar;
-        if (mode&2) cond|=is_vector;
-        if (!cond) {
-          const char *s_arg;
-          if (*s_op!='F') s_arg = !n_arg?"":n_arg==1?"Left-hand ":"Right-hand ";
-          else s_arg = !n_arg?"":n_arg==1?"First ":n_arg==2?"Second ":n_arg==3?"Third ":
-                 n_arg==4?"Fourth ":n_arg==5?"Fifth ":n_arg==6?"Sixth ":n_arg==7?"Seventh ":n_arg==8?"Eighth":
-                 n_arg==9?"Ninth":"One of the ";
-          CImg<charT> sb_type(32);
-          if (mode==1) cimg_snprintf(sb_type,sb_type._width,"'scalar'");
-          else if (mode==2) {
-            if (N) cimg_snprintf(sb_type,sb_type._width,"'vector%u'",N);
-            else cimg_snprintf(sb_type,sb_type._width,"'vector'");
-          } else {
-            if (N) cimg_snprintf(sb_type,sb_type._width,"'scalar' or 'vector%u'",N);
-            else cimg_snprintf(sb_type,sb_type._width,"'scalar' or 'vector'");
-          }
-          *se = saved_char;
-          char *const s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s %s%s has invalid type '%s' (should be %s), "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s_arg,*s_op=='F'?(*s_arg?"argument":"Argument"):(*s_arg?"operand":"Operand"),
-                                      s_type(arg)._data,sb_type._data,
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-      }
-
-      // Check that listin or listout are not empty.
-      void check_list(const bool is_out,
-                      char *const ss, char *const se, const char saved_char) {
-        if ((!is_out && !listin) || (is_out && !listout)) {
-          *se = saved_char;
-          char *const s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s Invalid call with an empty image list, "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-      }
-
-      // Check a vector is not 0-dimensional, or with unknown dimension at compile time.
-      void check_vector0(const unsigned int dim,
-                         char *const ss, char *const se, const char saved_char) {
-        char *s0 = 0;
-        if (!dim) {
-          *se = saved_char;
-          s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s Invalid construction of a 0-dimensional vector, "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        } else if (dim==~0U) {
-          *se = saved_char;
-          s0 = ss - 4>expr._data?ss - 4:expr._data;
-          cimg::strellipsize(s0,64);
-          throw CImgArgumentException("[_cimg_math_parser] "
-                                      "CImg<%s>::%s: %s%s Invalid construction of a vector with dynamic size, "
-                                      "in expression '%s%s%s'.",
-                                      pixel_type(),_cimg_mp_calling_function,s_op,*s_op?":":"",
-                                      s0!=expr._data?"...":"",s0,se<&expr.back()?"...":"");
-        }
-      }
-
-      // Evaluation functions, known by the parser.
-      // Defining these functions 'static' ensures that sizeof(mp_func)==sizeof(ulongT),
-      // so we can store pointers to them directly in the opcode vectors.
-#ifdef _mp_arg
-#undef _mp_arg
-#endif
-#define _mp_arg(x) mp.mem[mp.opcode[x]]
-
-      static double mp_abs(_cimg_math_parser& mp) {
-        return cimg::abs(_mp_arg(2));
-      }
-
-      static double mp_add(_cimg_math_parser& mp) {
-        return _mp_arg(2) + _mp_arg(3);
-      }
-
-      static double mp_acos(_cimg_math_parser& mp) {
-        return std::acos(_mp_arg(2));
-      }
-
-      static double mp_arg(_cimg_math_parser& mp) {
-        const int _ind = (int)_mp_arg(4);
-        const unsigned int
-          nb_args = (unsigned int)mp.opcode[2] - 4,
-          ind = _ind<0?_ind + nb_args:(unsigned int)_ind,
-          siz = (unsigned int)mp.opcode[3];
-        if (siz>0) {
-          if (ind>=nb_args) std::memset(&_mp_arg(1) + 1,0,siz*sizeof(double));
-          else std::memcpy(&_mp_arg(1) + 1,&_mp_arg(ind + 4) + 1,siz*sizeof(double));
-          return cimg::type<double>::nan();
-        }
-        if (ind>=nb_args) return 0;
-        return _mp_arg(ind + 4);
-      }
-
-      static double mp_argmin(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        unsigned int argval = 0;
-        for (unsigned int i = 4; i<i_end; ++i) {
-          const double _val = _mp_arg(i);
-          if (_val<val) { val = _val; argval = i - 3; }
-        }
-        return (double)argval;
-      }
-
-      static double mp_argmax(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        unsigned int argval = 0;
-        for (unsigned int i = 4; i<i_end; ++i) {
-          const double _val = _mp_arg(i);
-          if (_val>val) { val = _val; argval = i - 3; }
-        }
-        return (double)argval;
-      }
-
-      static double mp_asin(_cimg_math_parser& mp) {
-        return std::asin(_mp_arg(2));
-      }
-
-      static double mp_atan(_cimg_math_parser& mp) {
-        return std::atan(_mp_arg(2));
-      }
-
-      static double mp_atan2(_cimg_math_parser& mp) {
-        return std::atan2(_mp_arg(2),_mp_arg(3));
-      }
-
-      static double mp_bitwise_and(_cimg_math_parser& mp) {
-        return (double)((longT)_mp_arg(2) & (longT)_mp_arg(3));
-      }
-
-      static double mp_bitwise_left_shift(_cimg_math_parser& mp) {
-        return (double)((longT)_mp_arg(2)<<(unsigned int)_mp_arg(3));
-      }
-
-      static double mp_bitwise_not(_cimg_math_parser& mp) {
-        // Limit result to 32bits such that it can be entirely represented as a 'double'.
-        return (double)~(unsigned int)_mp_arg(2);
-      }
-
-      static double mp_bitwise_or(_cimg_math_parser& mp) {
-        return (double)((longT)_mp_arg(2) | (longT)_mp_arg(3));
-      }
-
-      static double mp_bitwise_right_shift(_cimg_math_parser& mp) {
-        return (double)((longT)_mp_arg(2)>>(unsigned int)_mp_arg(3));
-      }
-
-      static double mp_bitwise_xor(_cimg_math_parser& mp) {
-        return (double)((longT)_mp_arg(2) ^ (longT)_mp_arg(3));
-      }
-
-      static double mp_bool(_cimg_math_parser& mp) {
-        return (double)(bool)_mp_arg(2);
-      }
-
-      static double mp_break(_cimg_math_parser& mp) {
-        mp.break_type = 1;
-        mp.p_code = mp.p_break - 1;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_breakpoint(_cimg_math_parser& mp) {
-        cimg_abort_test();
-        cimg::unused(mp);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_cbrt(_cimg_math_parser& mp) {
-        return cimg::cbrt(_mp_arg(2));
-      }
-
-      static double mp_complex_abs(_cimg_math_parser& mp) {
-        return cimg::_hypot(_mp_arg(2),_mp_arg(3));
-      }
-
-      static double mp_complex_conj(_cimg_math_parser& mp) {
-        const double *ptrs = &_mp_arg(2) + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        *(ptrd++) = *(ptrs++);
-        *ptrd = -*(ptrs);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_div_sv(_cimg_math_parser& mp) {
-        const double
-          *ptr2 = &_mp_arg(3) + 1,
-          r1 = _mp_arg(2),
-          r2 = *(ptr2++), i2 = *ptr2;
-        double *ptrd = &_mp_arg(1) + 1;
-        const double denom = r2*r2 + i2*i2;
-        *(ptrd++) = r1*r2/denom;
-        *ptrd =  -r1*i2/denom;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_div_vv(_cimg_math_parser& mp) {
-        const double
-          *ptr1 = &_mp_arg(2) + 1, *ptr2 = &_mp_arg(3) + 1,
-          r1 = *(ptr1++), i1 = *ptr1,
-          r2 = *(ptr2++), i2 = *ptr2;
-        double *ptrd = &_mp_arg(1) + 1;
-        const double denom = r2*r2 + i2*i2;
-        *(ptrd++) = (r1*r2 + i1*i2)/denom;
-        *ptrd = (r2*i1 - r1*i2)/denom;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_exp(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptrs = &_mp_arg(2) + 1, r = *(ptrs++), i = *(ptrs), er = std::exp(r);
-        *(ptrd++) = er*std::cos(i);
-        *(ptrd++) = er*std::sin(i);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_log(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptrs = &_mp_arg(2) + 1, r = *(ptrs++), i = *(ptrs);
-        *(ptrd++) = 0.5*std::log(r*r + i*i);
-        *(ptrd++) = std::atan2(i,r);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_mul(_cimg_math_parser& mp) {
-        const double
-          *ptr1 = &_mp_arg(2) + 1, *ptr2 = &_mp_arg(3) + 1,
-          r1 = *(ptr1++), i1 = *ptr1,
-          r2 = *(ptr2++), i2 = *ptr2;
-        double *ptrd = &_mp_arg(1) + 1;
-        *(ptrd++) = r1*r2 - i1*i2;
-        *(ptrd++) = r1*i2 + r2*i1;
-        return cimg::type<double>::nan();
-      }
-
-      static void _mp_complex_pow(const double r1, const double i1,
-                                  const double r2, const double i2,
-                                  double *ptrd) {
-        double ro, io;
-        if (cimg::abs(i2)<1e-15) { // Exponent is real
-          if (cimg::abs(r1)<1e-15 && cimg::abs(i1)<1e-15) {
-            if (cimg::abs(r2)<1e-15) { ro = 1; io = 0; }
-            else ro = io = 0;
-          } else {
-            const double
-              mod1_2 = r1*r1 + i1*i1,
-              phi1 = std::atan2(i1,r1),
-              modo = std::pow(mod1_2,0.5*r2),
-              phio = r2*phi1;
-            ro = modo*std::cos(phio);
-            io = modo*std::sin(phio);
-          }
-        } else { // Exponent is complex
-          if (cimg::abs(r1)<1e-15 && cimg::abs(i1)<1e-15) ro = io = 0;
-          const double
-            mod1_2 = r1*r1 + i1*i1,
-            phi1 = std::atan2(i1,r1),
-            modo = std::pow(mod1_2,0.5*r2)*std::exp(-i2*phi1),
-            phio = r2*phi1 + 0.5*i2*std::log(mod1_2);
-          ro = modo*std::cos(phio);
-          io = modo*std::sin(phio);
-        }
-        *(ptrd++) = ro;
-        *ptrd = io;
-      }
-
-      static double mp_complex_pow_ss(_cimg_math_parser& mp) {
-        const double val1 = _mp_arg(2), val2 = _mp_arg(3);
-        double *ptrd = &_mp_arg(1) + 1;
-        _mp_complex_pow(val1,0,val2,0,ptrd);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_pow_sv(_cimg_math_parser& mp) {
-        const double val1 = _mp_arg(2), *ptr2 = &_mp_arg(3) + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        _mp_complex_pow(val1,0,ptr2[0],ptr2[1],ptrd);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_pow_vs(_cimg_math_parser& mp) {
-        const double *ptr1 = &_mp_arg(2) + 1, val2 = _mp_arg(3);
-        double *ptrd = &_mp_arg(1) + 1;
-        _mp_complex_pow(ptr1[0],ptr1[1],val2,0,ptrd);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_complex_pow_vv(_cimg_math_parser& mp) {
-        const double *ptr1 = &_mp_arg(2) + 1, *ptr2 = &_mp_arg(3) + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        _mp_complex_pow(ptr1[0],ptr1[1],ptr2[0],ptr2[1],ptrd);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_continue(_cimg_math_parser& mp) {
-        mp.break_type = 2;
-        mp.p_code = mp.p_break - 1;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_cos(_cimg_math_parser& mp) {
-        return std::cos(_mp_arg(2));
-      }
-
-      static double mp_cosh(_cimg_math_parser& mp) {
-        return std::cosh(_mp_arg(2));
-      }
-
-      static double mp_cross(_cimg_math_parser& mp) {
-        CImg<doubleT>
-          vout(&_mp_arg(1) + 1,1,3,1,1,true),
-          v1(&_mp_arg(2) + 1,1,3,1,1,true),
-          v2(&_mp_arg(3) + 1,1,3,1,1,true);
-        (vout = v1).cross(v2);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_cut(_cimg_math_parser& mp) {
-        double val = _mp_arg(2), cmin = _mp_arg(3), cmax = _mp_arg(4);
-        return val<cmin?cmin:val>cmax?cmax:val;
-      }
-
-      static double mp_debug(_cimg_math_parser& mp) {
-        CImg<charT> expr(mp.opcode[2] - 4);
-        const ulongT *ptrs = mp.opcode._data + 4;
-        cimg_for(expr,ptrd,char) *ptrd = (char)*(ptrs++);
-        cimg::strellipsize(expr);
-        const ulongT g_target = mp.opcode[1];
-
-#ifndef cimg_use_openmp
-        const unsigned int n_thread = 0;
-#else
-        const unsigned int n_thread = omp_get_thread_num();
-#endif
-        cimg_pragma_openmp(critical)
-        {
-          std::fprintf(cimg::output(),
-                       "\n[_cimg_math_parser] %p[thread #%u]:%*c"
-                       "Start debugging expression '%s', code length %u -> mem[%u] (memsize: %u)",
-                       (void*)&mp,n_thread,mp.debug_indent,' ',
-                       expr._data,(unsigned int)mp.opcode[3],(unsigned int)g_target,mp.mem._width);
-          std::fflush(cimg::output());
-          mp.debug_indent+=3;
-        }
-        const CImg<ulongT> *const p_end = (++mp.p_code) + mp.opcode[3];
-        CImg<ulongT> _op;
-        for ( ; mp.p_code<p_end; ++mp.p_code) {
-          const CImg<ulongT> &op = *mp.p_code;
-          mp.opcode._data = op._data;
-
-          _op.assign(1,op._height - 1);
-          const ulongT *ptrs = op._data + 1;
-          for (ulongT *ptrd = _op._data, *const ptrde = _op._data + _op._height; ptrd<ptrde; ++ptrd)
-            *ptrd = *(ptrs++);
-
-          const ulongT target = mp.opcode[1];
-          mp.mem[target] = _cimg_mp_defunc(mp);
-          cimg_pragma_openmp(critical)
-          {
-            std::fprintf(cimg::output(),
-                         "\n[_cimg_math_parser] %p[thread #%u]:%*c"
-                         "Opcode %p = [ %p,%s ] -> mem[%u] = %g",
-                         (void*)&mp,n_thread,mp.debug_indent,' ',
-                         (void*)mp.opcode._data,(void*)*mp.opcode,_op.value_string().data(),
-                         (unsigned int)target,mp.mem[target]);
-            std::fflush(cimg::output());
-          }
-        }
-        cimg_pragma_openmp(critical)
-        {
-          mp.debug_indent-=3;
-          std::fprintf(cimg::output(),
-            "\n[_cimg_math_parser] %p[thread #%u]:%*c"
-            "End debugging expression '%s' -> mem[%u] = %g (memsize: %u)",
-            (void*)&mp,n_thread,mp.debug_indent,' ',
-            expr._data,(unsigned int)g_target,mp.mem[g_target],mp.mem._width);
-          std::fflush(cimg::output());
-        }
-        --mp.p_code;
-        return mp.mem[g_target];
-      }
-
-      static double mp_decrement(_cimg_math_parser& mp) {
-        return _mp_arg(2) - 1;
-      }
-
-      static double mp_det(_cimg_math_parser& mp) {
-        const double *ptrs = &_mp_arg(2) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[3];
-        return CImg<double>(ptrs,k,k,1,1,true).det();
-      }
-
-      static double mp_diag(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptrs = &_mp_arg(2) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[3];
-        CImg<double>(ptrd,k,k,1,1,true) = CImg<double>(ptrs,1,k,1,1,true).get_diagonal();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_display_memory(_cimg_math_parser& mp) {
-        cimg::unused(mp);
-        std::fputc('\n',cimg::output());
-        mp.mem.display("[_cimg_math_parser] Memory snapshot");
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_display(_cimg_math_parser& mp) {
-        const unsigned int
-          _siz = (unsigned int)mp.opcode[3],
-          siz = _siz?_siz:1;
-        const double *const ptr = &_mp_arg(1) + (_siz?1:0);
-        const int
-          w = (int)_mp_arg(4),
-          h = (int)_mp_arg(5),
-          d = (int)_mp_arg(6),
-          s = (int)_mp_arg(7);
-        CImg<double> img;
-        if (w>0 && h>0 && d>0 && s>0) {
-          if ((unsigned int)w*h*d*s<=siz) img.assign(ptr,w,h,d,s,true);
-          else img.assign(ptr,siz).resize(w,h,d,s,-1);
-        } else img.assign(ptr,1,siz,1,1,true);
-
-        CImg<charT> expr(mp.opcode[2] - 8);
-        const ulongT *ptrs = mp.opcode._data + 8;
-        cimg_for(expr,ptrd,char) *ptrd = (char)*(ptrs++);
-        ((CImg<charT>::string("[_cimg_math_parser] ",false,true),expr)>'x').move_to(expr);
-        cimg::strellipsize(expr);
-        std::fputc('\n',cimg::output());
-        img.display(expr._data);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_div(_cimg_math_parser& mp) {
-        return _mp_arg(2)/_mp_arg(3);
-      }
-
-      static double mp_dot(_cimg_math_parser& mp) {
-        const unsigned int siz = (unsigned int)mp.opcode[4];
-        return CImg<doubleT>(&_mp_arg(2) + 1,1,siz,1,1,true).
-          dot(CImg<doubleT>(&_mp_arg(3) + 1,1,siz,1,1,true));
-      }
-
-      static double mp_dowhile(_cimg_math_parser& mp) {
-        const ulongT
-          mem_body = mp.opcode[1],
-          mem_cond = mp.opcode[2];
-        const CImg<ulongT>
-          *const p_body = ++mp.p_code,
-          *const p_cond = p_body + mp.opcode[3],
-          *const p_end = p_cond + mp.opcode[4];
-        const unsigned int vsiz = (unsigned int)mp.opcode[5];
-        if (mp.opcode[6]) { // Set default value for result and condition if necessary
-          if (vsiz) CImg<doubleT>(&mp.mem[mem_body] + 1,vsiz,1,1,1,true).fill(cimg::type<double>::nan());
-          else mp.mem[mem_body] = cimg::type<double>::nan();
-        }
-        if (mp.opcode[7]) mp.mem[mem_cond] = 0;
-
-        const unsigned int _break_type = mp.break_type;
-        mp.break_type = 0;
-        do {
-          for (mp.p_code = p_body; mp.p_code<p_cond; ++mp.p_code) { // Evaluate body
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-          if (mp.break_type==1) break; else if (mp.break_type==2) mp.break_type = 0;
-          for (mp.p_code = p_cond; mp.p_code<p_end; ++mp.p_code) { // Evaluate condition
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-          if (mp.break_type==1) break; else if (mp.break_type==2) mp.break_type = 0;
-        } while (mp.mem[mem_cond]);
-        mp.break_type = _break_type;
-        mp.p_code = p_end - 1;
-        return mp.mem[mem_body];
-      }
-
-      static double mp_eq(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)==_mp_arg(3));
-      }
-
-      static double mp_exp(_cimg_math_parser& mp) {
-        return std::exp(_mp_arg(2));
-      }
-
-      static double mp_eye(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[2];
-        CImg<double>(ptrd,k,k,1,1,true).identity_matrix();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_factorial(_cimg_math_parser& mp) {
-        return cimg::factorial(_mp_arg(2));
-      }
-
-      static double mp_fibonacci(_cimg_math_parser& mp) {
-        return cimg::fibonacci((int)_mp_arg(2));
-      }
-
-      static double mp_find(_cimg_math_parser& mp) {
-        const bool is_forward = (bool)_mp_arg(5);
-        const ulongT siz = (ulongT)mp.opcode[3];
-        longT ind = (longT)(mp.opcode[6]!=_cimg_mp_slot_nan?_mp_arg(6):is_forward?0:siz - 1);
-        if (ind<0 || ind>=(longT)siz) return -1.;
-        const double
-          *const ptrb = &_mp_arg(2) + 1,
-          *const ptre = ptrb + siz,
-          val = _mp_arg(4),
-          *ptr = ptrb + ind;
-
-        // Forward search
-        if (is_forward) {
-          while (ptr<ptre && *ptr!=val) ++ptr;
-          return ptr==ptre?-1.:(double)(ptr - ptrb);
-        }
-
-        // Backward search.
-        while (ptr>=ptrb && *ptr!=val) --ptr;
-        return ptr<ptrb?-1.:(double)(ptr - ptrb);
-      }
-
-      static double mp_find_seq(_cimg_math_parser& mp) {
-        const bool is_forward = (bool)_mp_arg(6);
-        const ulongT
-          siz1 = (ulongT)mp.opcode[3],
-          siz2 = (ulongT)mp.opcode[5];
-        longT ind = (longT)(mp.opcode[7]!=_cimg_mp_slot_nan?_mp_arg(7):is_forward?0:siz1 - 1);
-        if (ind<0 || ind>=(longT)siz1) return -1.;
-        const double
-          *const ptr1b = &_mp_arg(2) + 1,
-          *const ptr1e = ptr1b + siz1,
-          *const ptr2b = &_mp_arg(4) + 1,
-          *const ptr2e = ptr2b + siz2,
-          *ptr1 = ptr1b + ind,
-          *p1 = 0,
-          *p2 = 0;
-
-        // Forward search.
-        if (is_forward) {
-          do {
-            while (ptr1<ptr1e && *ptr1!=*ptr2b) ++ptr1;
-            p1 = ptr1 + 1;
-            p2 = ptr2b + 1;
-            while (p1<ptr1e && p2<ptr2e && *p1==*p2) { ++p1; ++p2; }
-          } while (p2<ptr2e && ++ptr1<ptr1e);
-          return p2<ptr2e?-1.0:(double)(ptr1 - ptr1b);
-        }
-
-        // Backward search.
-        do {
-          while (ptr1>=ptr1b && *ptr1!=*ptr2b) --ptr1;
-          p1 = ptr1 + 1;
-          p2 = ptr2b + 1;
-          while (p1<ptr1e && p2<ptr2e && *p1==*p2) { ++p1; ++p2; }
-        } while (p2<ptr2e && --ptr1>=ptr1b);
-        return p2<ptr2e?-1.0:(double)(ptr1 - ptr1b);
-      }
-
-      static double mp_for(_cimg_math_parser& mp) {
-        const ulongT
-          mem_body = mp.opcode[1],
-          mem_cond = mp.opcode[3];
-        const CImg<ulongT>
-          *const p_init = ++mp.p_code,
-          *const p_cond = p_init + mp.opcode[4],
-          *const p_body = p_cond + mp.opcode[5],
-          *const p_post = p_body + mp.opcode[6],
-          *const p_end = p_post + mp.opcode[7];
-        const unsigned int vsiz = (unsigned int)mp.opcode[2];
-        bool is_cond = false;
-        if (mp.opcode[8]) { // Set default value for result and condition if necessary
-          if (vsiz) CImg<doubleT>(&mp.mem[mem_body] + 1,vsiz,1,1,1,true).fill(cimg::type<double>::nan());
-          else mp.mem[mem_body] = cimg::type<double>::nan();
-        }
-        if (mp.opcode[9]) mp.mem[mem_cond] = 0;
-        const unsigned int _break_type = mp.break_type;
-        mp.break_type = 0;
-
-        for (mp.p_code = p_init; mp.p_code<p_cond; ++mp.p_code) { // Evaluate init
-          mp.opcode._data = mp.p_code->_data;
-          const ulongT target = mp.opcode[1];
-          mp.mem[target] = _cimg_mp_defunc(mp);
-        }
-
-        if (!mp.break_type) do {
-            for (mp.p_code = p_cond; mp.p_code<p_body; ++mp.p_code) { // Evaluate condition
-              mp.opcode._data = mp.p_code->_data;
-              const ulongT target = mp.opcode[1];
-              mp.mem[target] = _cimg_mp_defunc(mp);
-            }
-            if (mp.break_type==1) break;
-
-            is_cond = (bool)mp.mem[mem_cond];
-            if (is_cond && !mp.break_type) {
-              for (mp.p_code = p_body; mp.p_code<p_post; ++mp.p_code) { // Evaluate body
-                mp.opcode._data = mp.p_code->_data;
-                const ulongT target = mp.opcode[1];
-                mp.mem[target] = _cimg_mp_defunc(mp);
-              }
-              if (mp.break_type==1) break; else if (mp.break_type==2) mp.break_type = 0;
-
-              for (mp.p_code = p_post; mp.p_code<p_end; ++mp.p_code) { // Evaluate post-code
-                mp.opcode._data = mp.p_code->_data;
-                const ulongT target = mp.opcode[1];
-                mp.mem[target] = _cimg_mp_defunc(mp);
-              }
-              if (mp.break_type==1) break; else if (mp.break_type==2) mp.break_type = 0;
-            }
-          } while (is_cond);
-
-        mp.break_type = _break_type;
-        mp.p_code = p_end - 1;
-        return mp.mem[mem_body];
-      }
-
-      static double mp_g(_cimg_math_parser& mp) {
-        cimg::unused(mp);
-        return cimg::grand();
-      }
-
-      static double mp_gauss(_cimg_math_parser& mp) {
-        const double x = _mp_arg(2), s = _mp_arg(3);
-        return std::exp(-x*x/(2*s*s))/std::sqrt(2*s*s*cimg::PI);
-      }
-
-      static double mp_gt(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)>_mp_arg(3));
-      }
-
-      static double mp_gte(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)>=_mp_arg(3));
-      }
-
-      static double mp_i(_cimg_math_parser& mp) {
-        return (double)mp.imgin.atXYZC((int)mp.mem[_cimg_mp_slot_x],(int)mp.mem[_cimg_mp_slot_y],
-                                       (int)mp.mem[_cimg_mp_slot_z],(int)mp.mem[_cimg_mp_slot_c],(T)0);
-      }
-
-      static double mp_if(_cimg_math_parser& mp) {
-        const bool is_cond = (bool)_mp_arg(2);
-        const ulongT
-          mem_left = mp.opcode[3],
-          mem_right = mp.opcode[4];
-        const CImg<ulongT>
-          *const p_right = ++mp.p_code + mp.opcode[5],
-          *const p_end = p_right + mp.opcode[6];
-        const unsigned int vtarget = (unsigned int)mp.opcode[1], vsiz = (unsigned int)mp.opcode[7];
-        if (is_cond) for ( ; mp.p_code<p_right; ++mp.p_code) {
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-        else for (mp.p_code = p_right; mp.p_code<p_end; ++mp.p_code) {
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-        if (mp.p_code==mp.p_break) --mp.p_code;
-        else mp.p_code = p_end - 1;
-        if (vsiz) std::memcpy(&mp.mem[vtarget] + 1,&mp.mem[is_cond?mem_left:mem_right] + 1,sizeof(double)*vsiz);
-        return mp.mem[is_cond?mem_left:mem_right];
-      }
-
-      static double mp_image_crop(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const int x = (int)_mp_arg(3), y = (int)_mp_arg(4), z = (int)_mp_arg(5), c = (int)_mp_arg(6);
-        const unsigned int
-          dx = (unsigned int)mp.opcode[7],
-          dy = (unsigned int)mp.opcode[8],
-          dz = (unsigned int)mp.opcode[9],
-          dc = (unsigned int)mp.opcode[10];
-        const bool boundary_conditions = (bool)_mp_arg(11);
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        if (!img) std::memset(ptrd,0,dx*dy*dz*dc*sizeof(double));
-        else CImg<double>(ptrd,dx,dy,dz,dc,true) = img.get_crop(x,y,z,c,
-                                                                x + dx - 1,y + dy - 1,
-                                                                z + dz - 1,c + dc - 1,
-                                                                boundary_conditions);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_image_d(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.depth();
-      }
-
-      static double mp_image_draw(_cimg_math_parser& mp) {
-        const int x = (int)_mp_arg(4), y = (int)_mp_arg(5), z = (int)_mp_arg(6), c = (int)_mp_arg(7);
-        unsigned int ind = (unsigned int)mp.opcode[3];
-
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(3),mp.listin.width());
-        CImg<T> &img = ind==~0U?mp.imgout:mp.listout[ind];
-        unsigned int
-          dx = (unsigned int)mp.opcode[8],
-          dy = (unsigned int)mp.opcode[9],
-          dz = (unsigned int)mp.opcode[10],
-          dc = (unsigned int)mp.opcode[11];
-        dx = dx==~0U?img._width:(unsigned int)_mp_arg(8);
-        dy = dy==~0U?img._height:(unsigned int)_mp_arg(9);
-        dz = dz==~0U?img._depth:(unsigned int)_mp_arg(10);
-        dc = dc==~0U?img._spectrum:(unsigned int)_mp_arg(11);
-
-        const ulongT sizS = mp.opcode[2];
-        if (sizS<(ulongT)dx*dy*dz*dc)
-          throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Function 'draw()': "
-                                      "Sprite dimension (%lu values) and specified sprite geometry (%u,%u,%u,%u) "
-                                      "(%lu values) do not match.",
-                                      mp.imgin.pixel_type(),sizS,dx,dy,dz,dc,(ulongT)dx*dy*dz*dc);
-        CImg<double> S(&_mp_arg(1) + 1,dx,dy,dz,dc,true);
-        const float opacity = (float)_mp_arg(12);
-
-        if (img._data) {
-          if (mp.opcode[13]!=~0U) { // Opacity mask specified
-            const ulongT sizM = mp.opcode[14];
-            if (sizM<(ulongT)dx*dy*dz)
-              throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Function 'draw()': "
-                                          "Mask dimension (%lu values) and specified sprite geometry (%u,%u,%u,%u) "
-                                          "(%lu values) do not match.",
-                                          mp.imgin.pixel_type(),sizS,dx,dy,dz,dc,(ulongT)dx*dy*dz*dc);
-            const CImg<double> M(&_mp_arg(13) + 1,dx,dy,dz,(unsigned int)(sizM/(dx*dy*dz)),true);
-            img.draw_image(x,y,z,c,S,M,opacity,(float)_mp_arg(15));
-          } else img.draw_image(x,y,z,c,S,opacity);
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_image_h(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.height();
-      }
-
-      static double mp_image_resize(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listout.width());
-        cimg::mutex(6);
-        CImg<T> &img = mp.listout[ind];
-        const double
-          _w = mp.opcode[3]==~0U?-100:_mp_arg(3),
-          _h = mp.opcode[4]==~0U?-100:_mp_arg(4),
-          _d = mp.opcode[5]==~0U?-100:_mp_arg(5),
-          _s = mp.opcode[6]==~0U?-100:_mp_arg(6);
-        const unsigned int
-          w = (unsigned int)(_w>=0?_w:-_w*img.width()/100),
-          h = (unsigned int)(_h>=0?_h:-_h*img.height()/100),
-          d = (unsigned int)(_d>=0?_d:-_d*img.depth()/100),
-          s = (unsigned int)(_s>=0?_s:-_s*img.spectrum()/100),
-          interp = (int)_mp_arg(7);
-        if (mp.is_fill && img._data==mp.imgout._data) {
-          cimg::mutex(6,0);
-          throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Function 'resize()': "
-                                      "Cannot both fill and resize image (%u,%u,%u,%u) "
-                                      "to new dimensions (%u,%u,%u,%u).",
-                                      img.pixel_type(),img._width,img._height,img._depth,img._spectrum,w,h,d,s);
-        }
-        const unsigned int
-          boundary = (int)_mp_arg(8);
-        const float
-          cx = (float)_mp_arg(9),
-          cy = (float)_mp_arg(10),
-          cz = (float)_mp_arg(11),
-          cc = (float)_mp_arg(12);
-        img.resize(w,h,d,s,interp,boundary,cx,cy,cz,cc);
-        cimg::mutex(6,0);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_image_s(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.spectrum();
-      }
-
-      static double mp_image_w(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.width();
-      }
-
-      static double mp_image_wh(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.width()*img.height();
-      }
-
-      static double mp_image_whd(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.width()*img.height()*img.depth();
-      }
-
-      static double mp_image_whds(_cimg_math_parser& mp) {
-        unsigned int ind = (unsigned int)mp.opcode[2];
-        if (ind!=~0U) ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[ind];
-        return (double)img.width()*img.height()*img.depth()*img.spectrum();
-      }
-
-      static double mp_increment(_cimg_math_parser& mp) {
-        return _mp_arg(2) + 1;
-      }
-
-      static double mp_int(_cimg_math_parser& mp) {
-        return (double)(longT)_mp_arg(2);
-      }
-
-      static double mp_ioff(_cimg_math_parser& mp) {
-        const unsigned int
-          boundary_conditions = (unsigned int)_mp_arg(3);
-        const CImg<T> &img = mp.imgin;
-        const longT
-          off = (longT)_mp_arg(2),
-          whds = (longT)img.size();
-        if (off>=0 && off<whds) return (double)img[off];
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whds2 = 2*whds, moff = cimg::mod(off,whds2);
-            return (double)img[moff<whds?moff:whds2 - moff - 1];
-          }
-          case 2 : // Periodic
-            return (double)img[cimg::mod(off,whds)];
-          case 1 : // Neumann
-            return (double)img[off<0?0:whds - 1];
-          default : // Dirichlet
-            return 0;
-          }
-        return 0;
-      }
-
-      static double mp_isbool(_cimg_math_parser& mp) {
-        const double val = _mp_arg(2);
-        return (double)(val==0.0 || val==1.0);
-      }
-
-      static double mp_isin(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        const double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i)
-          if (val==_mp_arg(i)) return 1.0;
-        return 0.0;
-      }
-
-      static double mp_isinf(_cimg_math_parser& mp) {
-        return (double)cimg::type<double>::is_inf(_mp_arg(2));
-      }
-
-      static double mp_isint(_cimg_math_parser& mp) {
-        return (double)(cimg::mod(_mp_arg(2),1.0)==0);
-      }
-
-      static double mp_isnan(_cimg_math_parser& mp) {
-        return (double)cimg::type<double>::is_nan(_mp_arg(2));
-      }
-
-      static double mp_ixyzc(_cimg_math_parser& mp) {
-        const unsigned int
-          interpolation = (unsigned int)_mp_arg(6),
-          boundary_conditions = (unsigned int)_mp_arg(7);
-        const CImg<T> &img = mp.imgin;
-        const double
-          x = _mp_arg(2), y = _mp_arg(3),
-          z = _mp_arg(4), c = _mp_arg(5);
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(), s2 = 2*img.spectrum(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2),
-              mz = cimg::mod((int)z,d2), mc = cimg::mod((int)c,s2);
-            return (double)img(mx<img.width()?mx:w2 - mx - 1,
-                               my<img.height()?my:h2 - my - 1,
-                               mz<img.depth()?mz:d2 - mz - 1,
-                               mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img(cimg::mod((int)x,img.width()),
-                               cimg::mod((int)y,img.height()),
-                               cimg::mod((int)z,img.depth()),
-                               cimg::mod((int)c,img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._atXYZC((int)x,(int)y,(int)z,(int)c);
-          default : // Dirichlet
-            return (double)img.atXYZC((int)x,(int)y,(int)z,(int)c,(T)0);
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(), s2 = 2.0f*img.spectrum(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2),
-              mz = cimg::mod((float)z,d2), mc = cimg::mod((float)c,s2);
-            return (double)img._linear_atXYZC(mx<img.width()?mx:w2 - mx - 1,
-                                              my<img.height()?my:h2 - my - 1,
-                                              mz<img.depth()?mz:d2 - mz - 1,
-                                              mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img._linear_atXYZC(cimg::mod((float)x,(float)img.width()),
-                                              cimg::mod((float)y,(float)img.height()),
-                                              cimg::mod((float)z,(float)img.depth()),
-                                              cimg::mod((float)c,(float)img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._linear_atXYZC((float)x,(float)y,(float)z,(float)c);
-          default : // Dirichlet
-            return (double)img.linear_atXYZC((float)x,(float)y,(float)z,(float)c,(T)0);
-          }
-      }
-
-      static double mp_joff(_cimg_math_parser& mp) {
-        const unsigned int
-          boundary_conditions = (unsigned int)_mp_arg(3);
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const CImg<T> &img = mp.imgin;
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(2),
-          whds = (longT)img.size();
-        if (off>=0 && off<whds) return (double)img[off];
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whds2 = 2*whds, moff = cimg::mod(off,whds2);
-            return (double)img[moff<whds?moff:whds2 - moff - 1];
-          }
-          case 2 : // Periodic
-            return (double)img[cimg::mod(off,whds)];
-          case 1 : // Neumann
-            return (double)img[off<0?0:whds - 1];
-          default : // Dirichlet
-            return 0;
-          }
-        return 0;
-      }
-
-      static double mp_jxyzc(_cimg_math_parser& mp) {
-        const unsigned int
-          interpolation = (unsigned int)_mp_arg(6),
-          boundary_conditions = (unsigned int)_mp_arg(7);
-        const CImg<T> &img = mp.imgin;
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y],
-          oz = mp.mem[_cimg_mp_slot_z], oc = mp.mem[_cimg_mp_slot_c],
-          x = ox + _mp_arg(2), y = oy + _mp_arg(3),
-          z = oz + _mp_arg(4), c = oc + _mp_arg(5);
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(), s2 = 2*img.spectrum(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2),
-              mz = cimg::mod((int)z,d2), mc = cimg::mod((int)c,s2);
-            return (double)img(mx<img.width()?mx:w2 - mx - 1,
-                               my<img.height()?my:h2 - my - 1,
-                               mz<img.depth()?mz:d2 - mz - 1,
-                               mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img(cimg::mod((int)x,img.width()),
-                               cimg::mod((int)y,img.height()),
-                               cimg::mod((int)z,img.depth()),
-                               cimg::mod((int)c,img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._atXYZC((int)x,(int)y,(int)z,(int)c);
-          default : // Dirichlet
-            return (double)img.atXYZC((int)x,(int)y,(int)z,(int)c,(T)0);
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(), s2 = 2.0f*img.spectrum(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2),
-              mz = cimg::mod((float)z,d2), mc = cimg::mod((float)c,s2);
-            return (double)img._linear_atXYZC(mx<img.width()?mx:w2 - mx - 1,
-                                              my<img.height()?my:h2 - my - 1,
-                                              mz<img.depth()?mz:d2 - mz - 1,
-                                              mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img._linear_atXYZC(cimg::mod((float)x,(float)img.width()),
-                                              cimg::mod((float)y,(float)img.height()),
-                                              cimg::mod((float)z,(float)img.depth()),
-                                              cimg::mod((float)c,(float)img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._linear_atXYZC((float)x,(float)y,(float)z,(float)c);
-          default : // Dirichlet
-            return (double)img.linear_atXYZC((float)x,(float)y,(float)z,(float)c,(T)0);
-          }
-      }
-
-      static double mp_kth(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        CImg<doubleT> vals(i_end - 4);
-        double *p = vals.data();
-        for (unsigned int i = 4; i<i_end; ++i) *(p++) = _mp_arg(i);
-        int ind = (int)cimg::round(_mp_arg(3));
-        if (ind<0) ind+=vals.width() + 1;
-        ind = std::max(1,std::min(vals.width(),ind));
-        return vals.kth_smallest(ind - 1);
-      }
-
-      static double mp_linear_add(_cimg_math_parser& mp) {
-        return _mp_arg(2)*_mp_arg(3) + _mp_arg(4);
-      }
-
-      static double mp_linear_sub_left(_cimg_math_parser& mp) {
-        return _mp_arg(2)*_mp_arg(3) - _mp_arg(4);
-      }
-
-      static double mp_linear_sub_right(_cimg_math_parser& mp) {
-        return _mp_arg(4) - _mp_arg(2)*_mp_arg(3);
-      }
-
-      static double mp_list_depth(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._depth;
-      }
-
-      static double mp_list_find(_cimg_math_parser& mp) {
-        const unsigned int
-          indi = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = mp.listin[indi];
-        const bool is_forward = (bool)_mp_arg(4);
-        const ulongT siz = (ulongT)img.size();
-        longT ind = (longT)(mp.opcode[5]!=_cimg_mp_slot_nan?_mp_arg(5):is_forward?0:siz - 1);
-        if (ind<0 || ind>=(longT)siz) return -1.;
-        const T
-          *const ptrb = img.data(),
-          *const ptre = img.end(),
-          *ptr = ptrb + ind;
-        const double val = _mp_arg(3);
-
-        // Forward search
-        if (is_forward) {
-          while (ptr<ptre && (double)*ptr!=val) ++ptr;
-          return ptr==ptre?-1.:(double)(ptr - ptrb);
-        }
-
-        // Backward search.
-        while (ptr>=ptrb && (double)*ptr!=val) --ptr;
-        return ptr<ptrb?-1.:(double)(ptr - ptrb);
-      }
-
-      static double mp_list_find_seq(_cimg_math_parser& mp) {
-        const unsigned int
-          indi = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        const CImg<T> &img = mp.listin[indi];
-        const bool is_forward = (bool)_mp_arg(5);
-        const ulongT
-          siz1 = (ulongT)img.size(),
-          siz2 = (ulongT)mp.opcode[4];
-        longT ind = (longT)(mp.opcode[6]!=_cimg_mp_slot_nan?_mp_arg(6):is_forward?0:siz1 - 1);
-        if (ind<0 || ind>=(longT)siz1) return -1.;
-        const T
-          *const ptr1b = img.data(),
-          *const ptr1e = ptr1b + siz1,
-          *ptr1 = ptr1b + ind,
-          *p1 = 0;
-        const double
-          *const ptr2b = &_mp_arg(3) + 1,
-          *const ptr2e = ptr2b + siz2,
-          *p2 = 0;
-
-        // Forward search.
-        if (is_forward) {
-          do {
-            while (ptr1<ptr1e && *ptr1!=*ptr2b) ++ptr1;
-            p1 = ptr1 + 1;
-            p2 = ptr2b + 1;
-            while (p1<ptr1e && p2<ptr2e && *p1==*p2) { ++p1; ++p2; }
-          } while (p2<ptr2e && ++ptr1<ptr1e);
-          return p2<ptr2e?-1.0:(double)(ptr1 - ptr1b);
-        }
-
-        // Backward search.
-        do {
-          while (ptr1>=ptr1b && *ptr1!=*ptr2b) --ptr1;
-          p1 = ptr1 + 1;
-          p2 = ptr2b + 1;
-          while (p1<ptr1e && p2<ptr2e && *p1==*p2) { ++p1; ++p2; }
-        } while (p2<ptr2e && --ptr1>=ptr1b);
-        return p2<ptr2e?-1.0:(double)(ptr1 - ptr1b);
-      }
-
-      static double mp_list_height(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._height;
-      }
-
-      static double mp_list_ioff(_cimg_math_parser& mp) {
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          boundary_conditions = (unsigned int)_mp_arg(4);
-        const CImg<T> &img = mp.listin[ind];
-        const longT
-          off = (longT)_mp_arg(3),
-          whds = (longT)img.size();
-        if (off>=0 && off<whds) return (double)img[off];
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whds2 = 2*whds, moff = cimg::mod(off,whds2);
-            return (double)img[moff<whds?moff:whds2 - moff - 1];
-          }
-          case 2 : // Periodic
-            return (double)img[cimg::mod(off,whds)];
-          case 1 : // Neumann
-            return (double)img[off<0?0:whds - 1];
-          default : // Dirichlet
-            return 0;
-          }
-        return 0;
-      }
-
-      static double mp_list_is_shared(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._is_shared;
-      }
-
-      static double mp_list_ixyzc(_cimg_math_parser& mp) {
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          interpolation = (unsigned int)_mp_arg(7),
-          boundary_conditions = (unsigned int)_mp_arg(8);
-        const CImg<T> &img = mp.listin[ind];
-        const double
-          x = _mp_arg(3), y = _mp_arg(4),
-          z = _mp_arg(5), c = _mp_arg(6);
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(), s2 = 2*img.spectrum(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2),
-              mz = cimg::mod((int)z,d2), mc = cimg::mod((int)c,s2);
-            return (double)img(mx<img.width()?mx:w2 - mx - 1,
-                               my<img.height()?my:h2 - my - 1,
-                               mz<img.depth()?mz:d2 - mz - 1,
-                               mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img(cimg::mod((int)x,img.width()),
-                               cimg::mod((int)y,img.height()),
-                               cimg::mod((int)z,img.depth()),
-                               cimg::mod((int)c,img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._atXYZC((int)x,(int)y,(int)z,(int)c);
-          default : // Dirichlet
-            return (double)img.atXYZC((int)x,(int)y,(int)z,(int)c,(T)0);
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(), s2 = 2.0f*img.spectrum(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2),
-              mz = cimg::mod((float)z,d2), mc = cimg::mod((float)c,s2);
-            return (double)img._linear_atXYZC(mx<img.width()?mx:w2 - mx - 1,
-                                              my<img.height()?my:h2 - my - 1,
-                                              mz<img.depth()?mz:d2 - mz - 1,
-                                              mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img._linear_atXYZC(cimg::mod((float)x,(float)img.width()),
-                                              cimg::mod((float)y,(float)img.height()),
-                                              cimg::mod((float)z,(float)img.depth()),
-                                              cimg::mod((float)c,(float)img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._linear_atXYZC((float)x,(float)y,(float)z,(float)c);
-          default : // Dirichlet
-            return (double)img.linear_atXYZC((float)x,(float)y,(float)z,(float)c,(T)0);
-          }
-      }
-
-      static double mp_list_joff(_cimg_math_parser& mp) {
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          boundary_conditions = (unsigned int)_mp_arg(4);
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const CImg<T> &img = mp.listin[ind];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(3),
-          whds = (longT)img.size();
-        if (off>=0 && off<whds) return (double)img[off];
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whds2 = 2*whds, moff = cimg::mod(off,whds2);
-            return (double)img[moff<whds?moff:whds2 - moff - 1];
-          }
-          case 2 : // Periodic
-            return (double)img[cimg::mod(off,whds)];
-          case 1 : // Neumann
-            return (double)img[off<0?0:whds - 1];
-          default : // Dirichlet
-            return 0;
-          }
-        return 0;
-      }
-
-      static double mp_list_jxyzc(_cimg_math_parser& mp) {
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          interpolation = (unsigned int)_mp_arg(7),
-          boundary_conditions = (unsigned int)_mp_arg(8);
-        const CImg<T> &img = mp.listin[ind];
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y],
-          oz = mp.mem[_cimg_mp_slot_z], oc = mp.mem[_cimg_mp_slot_c],
-          x = ox + _mp_arg(3), y = oy + _mp_arg(4),
-          z = oz + _mp_arg(5), c = oc + _mp_arg(6);
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(), s2 = 2*img.spectrum(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2),
-              mz = cimg::mod((int)z,d2), mc = cimg::mod((int)c,s2);
-            return (double)img(mx<img.width()?mx:w2 - mx - 1,
-                               my<img.height()?my:h2 - my - 1,
-                               mz<img.depth()?mz:d2 - mz - 1,
-                               mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img(cimg::mod((int)x,img.width()),
-                               cimg::mod((int)y,img.height()),
-                               cimg::mod((int)z,img.depth()),
-                               cimg::mod((int)c,img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._atXYZC((int)x,(int)y,(int)z,(int)c);
-          default : // Dirichlet
-            return (double)img.atXYZC((int)x,(int)y,(int)z,(int)c,(T)0);
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(), s2 = 2.0f*img.spectrum(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2),
-              mz = cimg::mod((float)z,d2), mc = cimg::mod((float)c,s2);
-            return (double)img._linear_atXYZC(mx<img.width()?mx:w2 - mx - 1,
-                                              my<img.height()?my:h2 - my - 1,
-                                              mz<img.depth()?mz:d2 - mz - 1,
-                                              mc<img.spectrum()?mc:s2 - mc - 1);
-          }
-          case 2 : // Periodic
-            return (double)img._linear_atXYZC(cimg::mod((float)x,(float)img.width()),
-                                              cimg::mod((float)y,(float)img.height()),
-                                              cimg::mod((float)z,(float)img.depth()),
-                                              cimg::mod((float)c,(float)img.spectrum()));
-          case 1 : // Neumann
-            return (double)img._linear_atXYZC((float)x,(float)y,(float)z,(float)c);
-          default : // Dirichlet
-            return (double)img.linear_atXYZC((float)x,(float)y,(float)z,(float)c,(T)0);
-          }
-      }
-
-      static double mp_list_median(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        if (!mp.list_median) mp.list_median.assign(mp.listin._width);
-        if (!mp.list_median[ind]) CImg<doubleT>::vector(mp.listin[ind].median()).move_to(mp.list_median[ind]);
-        return *mp.list_median[ind];
-      }
-
-      static double mp_list_set_ioff(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const longT
-          off = (longT)_mp_arg(3),
-          whds = (longT)img.size();
-        const double val = _mp_arg(1);
-        if (off>=0 && off<whds) img[off] = (T)val;
-        return val;
-      }
-
-      static double mp_list_set_ixyzc(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          x = (int)_mp_arg(3), y = (int)_mp_arg(4),
-          z = (int)_mp_arg(5), c = (int)_mp_arg(6);
-        const double val = _mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() &&
-            z>=0 && z<img.depth() && c>=0 && c<img.spectrum())
-          img(x,y,z,c) = (T)val;
-        return val;
-      }
-
-      static double mp_list_set_joff(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(3),
-          whds = (longT)img.size();
-        const double val = _mp_arg(1);
-        if (off>=0 && off<whds) img[off] = (T)val;
-        return val;
-      }
-
-      static double mp_list_set_jxyzc(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y],
-          oz = mp.mem[_cimg_mp_slot_z], oc = mp.mem[_cimg_mp_slot_c];
-        const int
-          x = (int)(ox + _mp_arg(3)), y = (int)(oy + _mp_arg(4)),
-          z = (int)(oz + _mp_arg(5)), c = (int)(oc + _mp_arg(6));
-        const double val = _mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() &&
-            z>=0 && z<img.depth() && c>=0 && c<img.spectrum())
-          img(x,y,z,c) = (T)val;
-        return val;
-      }
-
-      static double mp_list_set_Ioff_s(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const longT
-          off = (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T val = (T)_mp_arg(1);
-        if (off>=0 && off<whd) {
-          T *ptrd = &img[off];
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_list_set_Ioff_v(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const longT
-          off = (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (off>=0 && off<whd) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[4];
-          T *ptrd = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_set_Ixyz_s(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          x = (int)_mp_arg(3),
-          y = (int)_mp_arg(4),
-          z = (int)_mp_arg(5);
-        const T val = (T)_mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_list_set_Ixyz_v(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          x = (int)_mp_arg(3),
-          y = (int)_mp_arg(4),
-          z = (int)_mp_arg(5);
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[6];
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_set_Joff_s(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T val = (T)_mp_arg(1);
-        if (off>=0 && off<whd) {
-          T *ptrd = &img[off];
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_list_set_Joff_v(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (off>=0 && off<whd) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[4];
-          T *ptrd = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_set_Jxyz_s(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const double ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z];
-        const int
-          x = (int)(ox + _mp_arg(3)),
-          y = (int)(oy + _mp_arg(4)),
-          z = (int)(oz + _mp_arg(5));
-        const T val = (T)_mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_list_set_Jxyz_v(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        CImg<T> &img = mp.listout[ind];
-        const double ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z];
-        const int
-          x = (int)(ox + _mp_arg(3)),
-          y = (int)(oy + _mp_arg(4)),
-          z = (int)(oz + _mp_arg(5));
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[6];
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_spectrum(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._spectrum;
-      }
-
-      static double mp_list_stats(_cimg_math_parser& mp) {
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          k = (unsigned int)_mp_arg(3);
-        if (!mp.list_stats) mp.list_stats.assign(mp.listin._width);
-        if (!mp.list_stats[ind]) mp.list_stats[ind].assign(1,14,1,1,0).fill(mp.listin[ind].get_stats(),false);
-        return mp.list_stats(ind,k);
-      }
-
-      static double mp_list_wh(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._width*mp.listin[ind]._height;
-      }
-
-      static double mp_list_whd(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._width*mp.listin[ind]._height*mp.listin[ind]._depth;
-      }
-
-      static double mp_list_whds(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._width*mp.listin[ind]._height*mp.listin[ind]._depth*mp.listin[ind]._spectrum;
-      }
-
-      static double mp_list_width(_cimg_math_parser& mp) {
-        const unsigned int ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width());
-        return (double)mp.listin[ind]._width;
-      }
-
-      static double mp_list_Ioff(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          boundary_conditions = (unsigned int)_mp_arg(4),
-          vsiz = (unsigned int)mp.opcode[5];
-        const CImg<T> &img = mp.listin[ind];
-        const longT
-          off = (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T *ptrs;
-        if (off>=0 && off<whd) {
-          ptrs = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-          return cimg::type<double>::nan();
-        }
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whd2 = 2*whd, moff = cimg::mod(off,whd2);
-            ptrs = &img[moff<whd?moff:whd2 - moff - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          }
-          case 2 : // Periodic
-            ptrs = &img[cimg::mod(off,whd)];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          case 1 : // Neumann
-            ptrs = off<0?&img[0]:&img[whd - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          default : // Dirichlet
-            std::memset(ptrd,0,vsiz*sizeof(double));
-            return cimg::type<double>::nan();
-          }
-        std::memset(ptrd,0,vsiz*sizeof(double));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_Ixyz(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          interpolation = (unsigned int)_mp_arg(6),
-          boundary_conditions = (unsigned int)_mp_arg(7),
-          vsiz = (unsigned int)mp.opcode[8];
-        const CImg<T> &img = mp.listin[ind];
-        const double x = _mp_arg(3), y = _mp_arg(4), z = _mp_arg(5);
-        const ulongT whd = (ulongT)img._width*img._height*img._depth;
-        const T *ptrs;
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2), mz = cimg::mod((int)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 2 : { // Periodic
-            const int
-              cx = cimg::mod((int)x,img.width()),
-              cy = cimg::mod((int)y,img.height()),
-              cz = cimg::mod((int)z,img.depth());
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 1 : { // Neumann
-            ptrs = &img._atXYZ((int)x,(int)y,(int)z);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          default : // Dirichlet
-            if (img.containsXYZC(x,y,z)) {
-              ptrs = &img((int)x,(int)y,(int)z);
-              cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-            } else std::memset(ptrd,0,vsiz*sizeof(double));
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2), mz = cimg::mod((float)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 2 : { // Periodic
-            const float
-              cx = cimg::mod((float)x,(float)img.width()),
-              cy = cimg::mod((float)y,(float)img.height()),
-              cz = cimg::mod((float)z,(float)img.depth());
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 1 : // Neumann
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ((float)x,(float)y,(float)z,c);
-            break;
-          case 0 : // Dirichlet
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img.linear_atXYZ((float)x,(float)y,(float)z,c,(T)0);
-          }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_Joff(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          boundary_conditions = (unsigned int)_mp_arg(4),
-          vsiz = (unsigned int)mp.opcode[5];
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y], oz = (int)mp.mem[_cimg_mp_slot_z];
-        const CImg<T> &img = mp.listin[ind];
-        const longT
-          off = img.offset(ox,oy,oz) + (longT)_mp_arg(3),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T *ptrs;
-        if (off>=0 && off<whd) {
-          ptrs = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-          return cimg::type<double>::nan();
-        }
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whd2 = 2*whd, moff = cimg::mod(off,whd2);
-            ptrs = &img[moff<whd?moff:whd2 - moff - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          }
-          case 2 : // Periodic
-            ptrs = &img[cimg::mod(off,whd)];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          case 1 : // Neumann
-            ptrs = off<0?&img[0]:&img[whd - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          default : // Dirichlet
-            std::memset(ptrd,0,vsiz*sizeof(double));
-            return cimg::type<double>::nan();
-          }
-        std::memset(ptrd,0,vsiz*sizeof(double));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_list_Jxyz(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          ind = (unsigned int)cimg::mod((int)_mp_arg(2),mp.listin.width()),
-          interpolation = (unsigned int)_mp_arg(6),
-          boundary_conditions = (unsigned int)_mp_arg(7),
-          vsiz = (unsigned int)mp.opcode[8];
-        const CImg<T> &img = mp.listin[ind];
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z],
-          x = ox + _mp_arg(3), y = oy + _mp_arg(4), z = oz + _mp_arg(5);
-        const ulongT whd = (ulongT)img._width*img._height*img._depth;
-        const T *ptrs;
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2), mz = cimg::mod((int)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 2 : { // Periodic
-            const int
-              cx = cimg::mod((int)x,img.width()),
-              cy = cimg::mod((int)y,img.height()),
-              cz = cimg::mod((int)z,img.depth());
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 1 : { // Neumann
-            ptrs = &img._atXYZ((int)x,(int)y,(int)z);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          default : // Dirichlet
-            if (img.containsXYZC(x,y,z)) {
-              ptrs = &img((int)x,(int)y,(int)z);
-              cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-            } else std::memset(ptrd,0,vsiz*sizeof(double));
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2), mz = cimg::mod((float)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 2 : { // Periodic
-            const float
-              cx = cimg::mod((float)x,(float)img.width()),
-              cy = cimg::mod((float)y,(float)img.height()),
-              cz = cimg::mod((float)z,(float)img.depth());
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 1 : // Neumann
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ((float)x,(float)y,(float)z,c);
-            break;
-          default : // Dirichlet
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img.linear_atXYZ((float)x,(float)y,(float)z,c,(T)0);
-          }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_log(_cimg_math_parser& mp) {
-        return std::log(_mp_arg(2));
-      }
-
-      static double mp_log10(_cimg_math_parser& mp) {
-        return std::log10(_mp_arg(2));
-      }
-
-      static double mp_log2(_cimg_math_parser& mp) {
-        return cimg::log2(_mp_arg(2));
-      }
-
-      static double mp_logical_and(_cimg_math_parser& mp) {
-        const bool val_left = (bool)_mp_arg(2);
-        const CImg<ulongT> *const p_end = ++mp.p_code + mp.opcode[4];
-        if (!val_left) { mp.p_code = p_end - 1; return 0; }
-        const ulongT mem_right = mp.opcode[3];
-        for ( ; mp.p_code<p_end; ++mp.p_code) {
-          mp.opcode._data = mp.p_code->_data;
-          const ulongT target = mp.opcode[1];
-          mp.mem[target] = _cimg_mp_defunc(mp);
-        }
-        --mp.p_code;
-        return (double)(bool)mp.mem[mem_right];
-      }
-
-      static double mp_logical_not(_cimg_math_parser& mp) {
-        return (double)!_mp_arg(2);
-      }
-
-      static double mp_logical_or(_cimg_math_parser& mp) {
-        const bool val_left = (bool)_mp_arg(2);
-        const CImg<ulongT> *const p_end = ++mp.p_code + mp.opcode[4];
-        if (val_left) { mp.p_code = p_end - 1; return 1; }
-        const ulongT mem_right = mp.opcode[3];
-        for ( ; mp.p_code<p_end; ++mp.p_code) {
-          mp.opcode._data = mp.p_code->_data;
-          const ulongT target = mp.opcode[1];
-          mp.mem[target] = _cimg_mp_defunc(mp);
-        }
-        --mp.p_code;
-        return (double)(bool)mp.mem[mem_right];
-      }
-
-      static double mp_lowercase(_cimg_math_parser& mp) {
-        return cimg::lowercase(_mp_arg(2));
-      }
-
-      static double mp_lt(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)<_mp_arg(3));
-      }
-
-      static double mp_lte(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)<=_mp_arg(3));
-      }
-
-      static double mp_matrix_eig(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptr1 = &_mp_arg(2) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[3];
-        CImg<double> val, vec;
-        CImg<double>(ptr1,k,k,1,1,true).symmetric_eigen(val,vec);
-        CImg<double>(ptrd,1,k,1,1,true) = val;
-        CImg<double>(ptrd + k,k,k,1,1,true) = vec.get_transpose();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_matrix_inv(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptr1 = &_mp_arg(2) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[3];
-        CImg<double>(ptrd,k,k,1,1,true) = CImg<double>(ptr1,k,k,1,1,true).get_invert();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_matrix_mul(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double
-          *ptr1 = &_mp_arg(2) + 1,
-          *ptr2 = &_mp_arg(3) + 1;
-        const unsigned int
-          k = (unsigned int)mp.opcode[4],
-          l = (unsigned int)mp.opcode[5],
-          m = (unsigned int)mp.opcode[6];
-        CImg<double>(ptrd,m,k,1,1,true) = CImg<double>(ptr1,l,k,1,1,true)*CImg<double>(ptr2,m,l,1,1,true);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_matrix_pseudoinv(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptr1 = &_mp_arg(2) + 1;
-        const unsigned int
-          k = (unsigned int)mp.opcode[3],
-          l = (unsigned int)mp.opcode[4];
-        CImg<double>(ptrd,l,k,1,1,true) = CImg<double>(ptr1,k,l,1,1,true).get_pseudoinvert();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_matrix_svd(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptr1 = &_mp_arg(2) + 1;
-        const unsigned int
-          k = (unsigned int)mp.opcode[3],
-          l = (unsigned int)mp.opcode[4];
-        CImg<double> U, S, V;
-        CImg<double>(ptr1,k,l,1,1,true).SVD(U,S,V);
-        CImg<double>(ptrd,k,l,1,1,true) = U;
-        CImg<double>(ptrd + k*l,1,k,1,1,true) = S;
-        CImg<double>(ptrd + k*l + k,k,k,1,1,true) = V;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_max(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i) val = std::max(val,_mp_arg(i));
-        return val;
-      }
-
-      static double* _mp_memcopy_double(_cimg_math_parser& mp, const unsigned int ind, const ulongT *const p_ref,
-                                        const longT siz, const long inc) {
-        const longT
-          off = *p_ref?p_ref[1] + (longT)mp.mem[(longT)p_ref[2]] + 1:ind,
-          eoff = off + (siz - 1)*inc;
-        if (off<0 || eoff>=mp.mem.width())
-          throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Function 'copy()': "
-                                      "Out-of-bounds variable pointer "
-                                      "(length: %ld, increment: %ld, offset start: %ld, "
-                                      "offset end: %ld, offset max: %u).",
-                                      mp.imgin.pixel_type(),siz,inc,off,eoff,mp.mem._width - 1);
-        return &mp.mem[off];
-      }
-
-      static float* _mp_memcopy_float(_cimg_math_parser& mp, const ulongT *const p_ref,
-                                      const longT siz, const long inc) {
-        const unsigned ind = (unsigned int)p_ref[1];
-        const CImg<T> &img = ind==~0U?mp.imgin:mp.listin[cimg::mod((int)mp.mem[ind],mp.listin.width())];
-        const bool is_relative = (bool)p_ref[2];
-        int ox, oy, oz, oc;
-        longT off = 0;
-        if (is_relative) {
-          ox = (int)mp.mem[_cimg_mp_slot_x];
-          oy = (int)mp.mem[_cimg_mp_slot_y];
-          oz = (int)mp.mem[_cimg_mp_slot_z];
-          oc = (int)mp.mem[_cimg_mp_slot_c];
-          off = img.offset(ox,oy,oz,oc);
-        }
-        if ((*p_ref)%2) {
-          const int
-            x = (int)mp.mem[p_ref[3]],
-            y = (int)mp.mem[p_ref[4]],
-            z = (int)mp.mem[p_ref[5]],
-            c = *p_ref==5?0:(int)mp.mem[p_ref[6]];
-          off+=img.offset(x,y,z,c);
-        } else off+=(longT)mp.mem[p_ref[3]];
-        const longT eoff = off + (siz - 1)*inc;
-        if (off<0 || eoff>=(longT)img.size())
-          throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Function 'copy()': "
-                                      "Out-of-bounds image pointer "
-                                      "(length: %ld, increment: %ld, offset start: %ld, "
-                                      "offset end: %ld, offset max: %lu).",
-                                      mp.imgin.pixel_type(),siz,inc,off,eoff,img.size() - 1);
-        return (float*)&img[off];
-      }
-
-      static double mp_memcopy(_cimg_math_parser& mp) {
-        longT siz = (longT)_mp_arg(4);
-        const longT inc_d = (longT)_mp_arg(5), inc_s = (longT)_mp_arg(6);
-        const float
-          _opacity = (float)_mp_arg(7),
-          opacity = (float)cimg::abs(_opacity),
-          omopacity = 1 - std::max(_opacity,0.0f);
-        if (siz>0) {
-          const bool
-            is_doubled = mp.opcode[8]<=1,
-            is_doubles = mp.opcode[15]<=1;
-          if (is_doubled && is_doubles) { // (double*) <- (double*)
-            double *ptrd = _mp_memcopy_double(mp,(unsigned int)mp.opcode[2],&mp.opcode[8],siz,inc_d);
-            const double *ptrs = _mp_memcopy_double(mp,(unsigned int)mp.opcode[3],&mp.opcode[15],siz,inc_s);
-            if (inc_d==1 && inc_s==1 && _opacity>=1) {
-              if (ptrs + siz - 1<ptrd || ptrs>ptrd + siz - 1) std::memcpy(ptrd,ptrs,siz*sizeof(double));
-              else std::memmove(ptrd,ptrs,siz*sizeof(double));
-            } else {
-              if (ptrs + (siz - 1)*inc_s<ptrd || ptrs>ptrd + (siz - 1)*inc_d) {
-                if (_opacity>=1) while (siz-->0) { *ptrd = *ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-                else while (siz-->0) { *ptrd = omopacity**ptrd + opacity**ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-              } else { // Overlapping buffers
-                CImg<double> buf((unsigned int)siz);
-                cimg_for(buf,ptr,double) { *ptr = *ptrs; ptrs+=inc_s; }
-                ptrs = buf;
-                if (_opacity>=1) while (siz-->0) { *ptrd = *(ptrs++); ptrd+=inc_d; }
-                else while (siz-->0) { *ptrd = omopacity**ptrd + opacity**(ptrs++); ptrd+=inc_d; }
-              }
-            }
-          } else if (is_doubled && !is_doubles) { // (double*) <- (float*)
-            double *ptrd = _mp_memcopy_double(mp,(unsigned int)mp.opcode[2],&mp.opcode[8],siz,inc_d);
-            const float *ptrs = _mp_memcopy_float(mp,&mp.opcode[15],siz,inc_s);
-            if (_opacity>=1) while (siz-->0) { *ptrd = *ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-            else while (siz-->0) { *ptrd = omopacity**ptrd + _opacity**ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-          } else if (!is_doubled && is_doubles) { // (float*) <- (double*)
-            float *ptrd = _mp_memcopy_float(mp,&mp.opcode[8],siz,inc_d);
-            const double *ptrs = _mp_memcopy_double(mp,(unsigned int)mp.opcode[3],&mp.opcode[15],siz,inc_s);
-            if (_opacity>=1) while (siz-->0) { *ptrd = (float)*ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-            else while (siz-->0) { *ptrd = (float)(omopacity**ptrd + opacity**ptrs); ptrd+=inc_d; ptrs+=inc_s; }
-          } else { // (float*) <- (float*)
-            float *ptrd = _mp_memcopy_float(mp,&mp.opcode[8],siz,inc_d);
-            const float *ptrs = _mp_memcopy_float(mp,&mp.opcode[15],siz,inc_s);
-            if (inc_d==1 && inc_s==1 && _opacity>=1) {
-              if (ptrs + siz - 1<ptrd || ptrs>ptrd + siz - 1) std::memcpy(ptrd,ptrs,siz*sizeof(float));
-              else std::memmove(ptrd,ptrs,siz*sizeof(float));
-            } else {
-              if (ptrs + (siz - 1)*inc_s<ptrd || ptrs>ptrd + (siz - 1)*inc_d) {
-                if (_opacity>=1) while (siz-->0) { *ptrd = *ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-                else while (siz-->0) { *ptrd = omopacity**ptrd + opacity**ptrs; ptrd+=inc_d; ptrs+=inc_s; }
-              } else { // Overlapping buffers
-                CImg<floatT> buf((unsigned int)siz);
-                cimg_for(buf,ptr,float) { *ptr = *ptrs; ptrs+=inc_s; }
-                ptrs = buf;
-                if (_opacity>=1) while (siz-->0) { *ptrd = *(ptrs++); ptrd+=inc_d; }
-                else while (siz-->0) { *ptrd = omopacity**ptrd + opacity**(ptrs++); ptrd+=inc_d; }
-              }
-            }
-          }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_min(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i) val = std::min(val,_mp_arg(i));
-        return val;
-      }
-
-      static double mp_minus(_cimg_math_parser& mp) {
-        return -_mp_arg(2);
-      }
-
-      static double mp_mean(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i) val+=_mp_arg(i);
-        return val/(i_end - 3);
-      }
-
-      static double mp_median(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        switch (i_end - 3) {
-        case 1 : return _mp_arg(3);
-        case 2 : return cimg::median(_mp_arg(3),_mp_arg(4));
-        case 3 : return cimg::median(_mp_arg(3),_mp_arg(4),_mp_arg(5));
-        case 5 : return cimg::median(_mp_arg(3),_mp_arg(4),_mp_arg(5),_mp_arg(6),_mp_arg(7));
-        case 7 : return cimg::median(_mp_arg(3),_mp_arg(4),_mp_arg(5),_mp_arg(6),_mp_arg(7),_mp_arg(8),_mp_arg(9));
-        case 9 : return cimg::median(_mp_arg(3),_mp_arg(4),_mp_arg(5),_mp_arg(6),_mp_arg(7),_mp_arg(8),_mp_arg(9),
-                                     _mp_arg(10),_mp_arg(11));
-        case 13 : return cimg::median(_mp_arg(3),_mp_arg(4),_mp_arg(5),_mp_arg(6),_mp_arg(7),_mp_arg(8),_mp_arg(9),
-                                      _mp_arg(10),_mp_arg(11),_mp_arg(12),_mp_arg(13),_mp_arg(14),_mp_arg(15));
-        }
-        CImg<doubleT> vals(i_end - 3);
-        double *p = vals.data();
-        for (unsigned int i = 3; i<i_end; ++i) *(p++) = _mp_arg(i);
-        return vals.median();
-      }
-
-      static double mp_modulo(_cimg_math_parser& mp) {
-        return cimg::mod(_mp_arg(2),_mp_arg(3));
-      }
-
-      static double mp_mul(_cimg_math_parser& mp) {
-        return _mp_arg(2)*_mp_arg(3);
-      }
-
-      static double mp_mul2(_cimg_math_parser& mp) {
-        return _mp_arg(2)*_mp_arg(3)*_mp_arg(4);
-      }
-
-      static double mp_neq(_cimg_math_parser& mp) {
-        return (double)(_mp_arg(2)!=_mp_arg(3));
-      }
-
-      static double mp_norm0(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        switch (i_end - 3) {
-        case 1 : return _mp_arg(3)!=0;
-        case 2 : return (_mp_arg(3)!=0) + (_mp_arg(4)!=0);
-        }
-        double res = 0;
-        for (unsigned int i = 3; i<i_end; ++i)
-          res+=_mp_arg(i)==0?0:1;
-        return res;
-      }
-
-      static double mp_norm1(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        switch (i_end - 3) {
-        case 1 : return cimg::abs(_mp_arg(3));
-        case 2 : return cimg::abs(_mp_arg(3)) + cimg::abs(_mp_arg(4));
-        }
-        double res = 0;
-        for (unsigned int i = 3; i<i_end; ++i)
-          res+=cimg::abs(_mp_arg(i));
-        return res;
-      }
-
-      static double mp_norm2(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        switch (i_end - 3) {
-        case 1 : return cimg::abs(_mp_arg(3));
-        case 2 : return cimg::_hypot(_mp_arg(3),_mp_arg(4));
-        }
-        double res = 0;
-        for (unsigned int i = 3; i<i_end; ++i)
-          res+=cimg::sqr(_mp_arg(i));
-        return std::sqrt(res);
-      }
-
-      static double mp_norminf(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        switch (i_end - 3) {
-        case 1 : return cimg::abs(_mp_arg(3));
-        case 2 : return std::max(cimg::abs(_mp_arg(3)),cimg::abs(_mp_arg(4)));
-        }
-        double res = 0;
-        for (unsigned int i = 3; i<i_end; ++i) {
-          const double val = cimg::abs(_mp_arg(i));
-          if (val>res) res = val;
-        }
-        return res;
-      }
-
-      static double mp_normp(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        if (i_end==4) return cimg::abs(_mp_arg(3));
-        const double p = (double)mp.opcode[3];
-        double res = 0;
-        for (unsigned int i = 4; i<i_end; ++i)
-          res+=std::pow(cimg::abs(_mp_arg(i)),p);
-        res = std::pow(res,1/p);
-        return res>0?res:0.0;
-      }
-
-      static double mp_permutations(_cimg_math_parser& mp) {
-        return cimg::permutations(_mp_arg(2),_mp_arg(3),(bool)_mp_arg(4));
-      }
-
-      static double mp_pow(_cimg_math_parser& mp) {
-        const double v = _mp_arg(2), p = _mp_arg(3);
-        return std::pow(v,p);
-      }
-
-      static double mp_pow0_25(_cimg_math_parser& mp) {
-        const double val = _mp_arg(2);
-        return std::sqrt(std::sqrt(val));
-      }
-
-      static double mp_pow3(_cimg_math_parser& mp) {
-        const double val = _mp_arg(2);
-        return val*val*val;
-      }
-
-      static double mp_pow4(_cimg_math_parser& mp) {
-        const double val = _mp_arg(2);
-        return val*val*val*val;
-      }
-
-      static double mp_print(_cimg_math_parser& mp) {
-          const double val = _mp_arg(1);
-          cimg_pragma_openmp(critical)
-          {
-            CImg<charT> expr(mp.opcode[2] - 3);
-            const ulongT *ptrs = mp.opcode._data + 3;
-            cimg_for(expr,ptrd,char) *ptrd = (char)*(ptrs++);
-            cimg::strellipsize(expr);
-            cimg::mutex(6);
-            std::fprintf(cimg::output(),"\n[_cimg_math_parser] %s = %g",expr._data,val);
-            std::fflush(cimg::output());
-            cimg::mutex(6,0);
-          }
-          return val;
-      }
-
-      static double mp_prod(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i) val*=_mp_arg(i);
-        return val;
-      }
-
-      static double mp_copy(_cimg_math_parser& mp) {
-        return _mp_arg(2);
-      }
-
-      static double mp_rol(_cimg_math_parser& mp) {
-        return cimg::rol(_mp_arg(2),(unsigned int)_mp_arg(3));
-      }
-
-      static double mp_ror(_cimg_math_parser& mp) {
-        return cimg::ror(_mp_arg(2),(unsigned int)_mp_arg(3));
-      }
-
-      static double mp_rot2d(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const float
-          theta = (float)_mp_arg(2)*cimg::PI/180,
-          ca = std::cos(theta),
-          sa = std::sin(theta);
-        *(ptrd++) = ca;
-        *(ptrd++) = -sa;
-        *(ptrd++) = sa;
-        *ptrd = ca;
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_rot3d(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const float x = (float)_mp_arg(2), y = (float)_mp_arg(3), z = (float)_mp_arg(4), theta = (float)_mp_arg(5);
-        CImg<double>(ptrd,3,3,1,1,true) = CImg<double>::rotation_matrix(x,y,z,theta);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_round(_cimg_math_parser& mp) {
-        return cimg::round(_mp_arg(2),_mp_arg(3),(int)_mp_arg(4));
-      }
-
-      static double mp_self_add(_cimg_math_parser& mp) {
-        return _mp_arg(1)+=_mp_arg(2);
-      }
-
-      static double mp_self_bitwise_and(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = (double)((longT)val & (longT)_mp_arg(2));
-      }
-
-      static double mp_self_bitwise_left_shift(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = (double)((longT)val<<(unsigned int)_mp_arg(2));
-      }
-
-      static double mp_self_bitwise_or(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = (double)((longT)val | (longT)_mp_arg(2));
-      }
-
-      static double mp_self_bitwise_right_shift(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = (double)((longT)val>>(unsigned int)_mp_arg(2));
-      }
-
-      static double mp_self_decrement(_cimg_math_parser& mp) {
-        return --_mp_arg(1);
-      }
-
-      static double mp_self_increment(_cimg_math_parser& mp) {
-        return ++_mp_arg(1);
-      }
-
-      static double mp_self_map_vector_s(_cimg_math_parser& mp) { // Vector += scalar
-        unsigned int
-          ptrd = (unsigned int)mp.opcode[1] + 1,
-          siz = (unsigned int)mp.opcode[2];
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,3);
-        l_opcode[2] = mp.opcode[4]; // Scalar argument.
-        l_opcode.swap(mp.opcode);
-        ulongT &target = mp.opcode[1];
-        while (siz-->0) { target = ptrd++; (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_self_map_vector_v(_cimg_math_parser& mp) { // Vector += vector
-        unsigned int
-          ptrd = (unsigned int)mp.opcode[1] + 1,
-          siz = (unsigned int)mp.opcode[2],
-          ptrs = (unsigned int)mp.opcode[4] + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,4);
-        l_opcode.swap(mp.opcode);
-        ulongT &target = mp.opcode[1], &argument = mp.opcode[2];
-        while (siz-->0) { target = ptrd++; argument = ptrs++; (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_self_mul(_cimg_math_parser& mp) {
-        return _mp_arg(1)*=_mp_arg(2);
-      }
-
-      static double mp_self_div(_cimg_math_parser& mp) {
-        return _mp_arg(1)/=_mp_arg(2);
-      }
-
-      static double mp_self_modulo(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = cimg::mod(val,_mp_arg(2));
-      }
-
-      static double mp_self_pow(_cimg_math_parser& mp) {
-        double &val = _mp_arg(1);
-        return val = std::pow(val,_mp_arg(2));
-      }
-
-      static double mp_self_sub(_cimg_math_parser& mp) {
-        return _mp_arg(1)-=_mp_arg(2);
-      }
-
-      static double mp_set_ioff(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const longT
-          off = (longT)_mp_arg(2),
-          whds = (longT)img.size();
-        const double val = _mp_arg(1);
-        if (off>=0 && off<whds) img[off] = (T)val;
-        return val;
-      }
-
-      static double mp_set_ixyzc(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          x = (int)_mp_arg(2), y = (int)_mp_arg(3),
-          z = (int)_mp_arg(4), c = (int)_mp_arg(5);
-        const double val = _mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() &&
-            z>=0 && z<img.depth() && c>=0 && c<img.spectrum())
-          img(x,y,z,c) = (T)val;
-        return val;
-      }
-
-      static double mp_set_joff(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(2),
-          whds = (longT)img.size();
-        const double val = _mp_arg(1);
-        if (off>=0 && off<whds) img[off] = (T)val;
-        return val;
-      }
-
-      static double mp_set_jxyzc(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y],
-          oz = mp.mem[_cimg_mp_slot_z], oc = mp.mem[_cimg_mp_slot_c];
-        const int
-          x = (int)(ox + _mp_arg(2)), y = (int)(oy + _mp_arg(3)),
-          z = (int)(oz + _mp_arg(4)), c = (int)(oc + _mp_arg(5));
-        const double val = _mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() &&
-            z>=0 && z<img.depth() && c>=0 && c<img.spectrum())
-          img(x,y,z,c) = (T)val;
-        return val;
-      }
-
-      static double mp_set_Ioff_s(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const longT
-          off = (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T val = (T)_mp_arg(1);
-        if (off>=0 && off<whd) {
-          T *ptrd = &img[off];
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_set_Ioff_v(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const longT
-          off = (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (off>=0 && off<whd) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[3];
-          T *ptrd = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_set_Ixyz_s(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          x = (int)_mp_arg(2),
-          y = (int)_mp_arg(3),
-          z = (int)_mp_arg(4);
-        const T val = (T)_mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_set_Ixyz_v(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          x = (int)_mp_arg(2),
-          y = (int)_mp_arg(3),
-          z = (int)_mp_arg(4);
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[5];
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_set_Joff_s(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T val = (T)_mp_arg(1);
-        if (off>=0 && off<whd) {
-          T *ptrd = &img[off];
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_set_Joff_v(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x], oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z], oc = (int)mp.mem[_cimg_mp_slot_c];
-        const longT
-          off = img.offset(ox,oy,oz,oc) + (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (off>=0 && off<whd) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[3];
-          T *ptrd = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_set_Jxyz_s(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const double ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z];
-        const int
-          x = (int)(ox + _mp_arg(2)),
-          y = (int)(oy + _mp_arg(3)),
-          z = (int)(oz + _mp_arg(4));
-        const T val = (T)_mp_arg(1);
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_forC(img,c) { *ptrd = val; ptrd+=whd; }
-        }
-        return _mp_arg(1);
-      }
-
-      static double mp_set_Jxyz_v(_cimg_math_parser& mp) {
-        CImg<T> &img = mp.imgout;
-        const double ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z];
-        const int
-          x = (int)(ox + _mp_arg(2)),
-          y = (int)(oy + _mp_arg(3)),
-          z = (int)(oz + _mp_arg(4));
-        const double *ptrs = &_mp_arg(1) + 1;
-        if (x>=0 && x<img.width() && y>=0 && y<img.height() && z>=0 && z<img.depth()) {
-          const unsigned int vsiz = (unsigned int)mp.opcode[5];
-          T *ptrd = &img(x,y,z);
-          const ulongT whd = (ulongT)img._width*img._height*img._depth;
-          cimg_for_inC(img,0,vsiz - 1,c) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_sign(_cimg_math_parser& mp) {
-        return cimg::sign(_mp_arg(2));
-      }
-
-      static double mp_sin(_cimg_math_parser& mp) {
-        return std::sin(_mp_arg(2));
-      }
-
-      static double mp_sinc(_cimg_math_parser& mp) {
-        return cimg::sinc(_mp_arg(2));
-      }
-
-      static double mp_single(_cimg_math_parser& mp) {
-        const double res = _mp_arg(1);
-        cimg_pragma_openmp(critical)
-        {
-          for (const CImg<ulongT> *const p_end = ++mp.p_code + mp.opcode[2];
-               mp.p_code<p_end; ++mp.p_code) { // Evaluate body
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-        }
-        --mp.p_code;
-        return res;
-      }
-
-      static double mp_sinh(_cimg_math_parser& mp) {
-        return std::sinh(_mp_arg(2));
-      }
-
-      static double mp_solve(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double
-          *ptr1 = &_mp_arg(2) + 1,
-          *ptr2 = &_mp_arg(3) + 1;
-        const unsigned int
-          k = (unsigned int)mp.opcode[4],
-          l = (unsigned int)mp.opcode[5],
-          m = (unsigned int)mp.opcode[6];
-        CImg<double>(ptrd,m,k,1,1,true) = CImg<double>(ptr2,m,l,1,1,true).get_solve(CImg<double>(ptr1,k,l,1,1,true));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_sort(_cimg_math_parser& mp) {
-        double *const ptrd = &_mp_arg(1) + 1;
-        const double *const ptrs = &_mp_arg(2) + 1;
-        const unsigned int
-          siz = (unsigned int)mp.opcode[3],
-          chunk_siz = (unsigned int)mp.opcode[5];
-        const bool is_increasing = (bool)_mp_arg(4);
-        CImg<doubleT>(ptrd,chunk_siz,siz/chunk_siz,1,1,true) = CImg<doubleT>(ptrs,chunk_siz,siz/chunk_siz,1,1,true).
-          get_sort(is_increasing,chunk_siz>1?'y':0);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_sqr(_cimg_math_parser& mp) {
-        return cimg::sqr(_mp_arg(2));
-      }
-
-      static double mp_sqrt(_cimg_math_parser& mp) {
-        return std::sqrt(_mp_arg(2));
-      }
-
-      static double mp_std(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        CImg<doubleT> vals(i_end - 3);
-        double *p = vals.data();
-        for (unsigned int i = 3; i<i_end; ++i) *(p++) = _mp_arg(i);
-        return std::sqrt(vals.variance());
-      }
-
-      static double mp_string_init(_cimg_math_parser& mp) {
-        const char *ptrs = (char*)&mp.opcode[3];
-        unsigned int
-          ptrd = (unsigned int)mp.opcode[1] + 1,
-          siz = (unsigned int)mp.opcode[2];
-        while (siz-->0) mp.mem[ptrd++] = (double)*(ptrs++);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_stod(_cimg_math_parser& mp) {
-        const double *ptrs = &_mp_arg(2);
-        const unsigned int siz = (unsigned int)_mp_arg(3);
-        const bool is_strict = (bool)_mp_arg(4);
-        if (!siz) return *ptrs>='0' && *ptrs<='9'?*ptrs - '0':cimg::type<double>::nan();
-        CImg<charT> ss(siz + 1);
-        double val = cimg::type<double>::nan();
-        char sep;
-        for (unsigned i = 0; i<siz; ++i) ss[i] = (char)*(++ptrs);
-        ss[siz] = 0;
-
-        int err = std::sscanf(ss,"%lf%c",&val,&sep);
-#if cimg_OS==2
-        // Check for +/-NaN and +/-inf as Microsoft's sscanf() version is not able
-        // to read those particular values.
-        if (!err && (*ss=='+' || *ss=='-' || *ss=='i' || *ss=='I' || *ss=='n' || *ss=='N')) {
-          bool is_positive = true;
-          const char *s = ss;
-          if (*s=='+') ++s; else if (*s=='-') { ++s; is_positive = false; }
-          if (!cimg::strcasecmp(s,"inf")) { val = cimg::type<double>::inf(); err = 1; }
-          else if (!cimg::strcasecmp(s,"nan")) { val = cimg::type<double>::nan(); err = 1; }
-          if (err==1 && !is_positive) val = -val;
-        }
-#endif
-        if (is_strict && err!=1) return cimg::type<double>::nan();
-        return val;
-      }
-
-      static double mp_sub(_cimg_math_parser& mp) {
-        return _mp_arg(2) - _mp_arg(3);
-      }
-
-      static double mp_sum(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        double val = _mp_arg(3);
-        for (unsigned int i = 4; i<i_end; ++i) val+=_mp_arg(i);
-        return val;
-      }
-
-      static double mp_tan(_cimg_math_parser& mp) {
-        return std::tan(_mp_arg(2));
-      }
-
-      static double mp_tanh(_cimg_math_parser& mp) {
-        return std::tanh(_mp_arg(2));
-      }
-
-      static double mp_trace(_cimg_math_parser& mp) {
-        const double *ptrs = &_mp_arg(2) + 1;
-        const unsigned int k = (unsigned int)mp.opcode[3];
-        return CImg<double>(ptrs,k,k,1,1,true).trace();
-      }
-
-      static double mp_transp(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const double *ptrs = &_mp_arg(2) + 1;
-        const unsigned int
-          k = (unsigned int)mp.opcode[3],
-          l = (unsigned int)mp.opcode[4];
-        CImg<double>(ptrd,l,k,1,1,true) = CImg<double>(ptrs,k,l,1,1,true).get_transpose();
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_u(_cimg_math_parser& mp) {
-        return cimg::rand(_mp_arg(2),_mp_arg(3));
-      }
-
-      static double mp_uppercase(_cimg_math_parser& mp) {
-        return cimg::uppercase(_mp_arg(2));
-      }
-
-      static double mp_variance(_cimg_math_parser& mp) {
-        const unsigned int i_end = (unsigned int)mp.opcode[2];
-        CImg<doubleT> vals(i_end - 3);
-        double *p = vals.data();
-        for (unsigned int i = 3; i<i_end; ++i) *(p++) = _mp_arg(i);
-        return vals.variance();
-      }
-
-      static double mp_vector_copy(_cimg_math_parser& mp) {
-        std::memcpy(&_mp_arg(1) + 1,&_mp_arg(2) + 1,sizeof(double)*mp.opcode[3]);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_crop(_cimg_math_parser& mp) {
-        double *const ptrd = &_mp_arg(1) + 1;
-        const double *const ptrs = &_mp_arg(2) + 1;
-        const longT
-          length = (longT)mp.opcode[3],
-          start = (longT)_mp_arg(4),
-          sublength = (longT)mp.opcode[5];
-        if (start<0 || start + sublength>length)
-          throw CImgArgumentException("[_cimg_math_parser] CImg<%s>: Value accessor '[]': "
-                                      "Out-of-bounds sub-vector request "
-                                      "(length: %ld, start: %ld, sub-length: %ld).",
-                                      mp.imgin.pixel_type(),length,start,sublength);
-        std::memcpy(ptrd,ptrs + start,sublength*sizeof(double));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_init(_cimg_math_parser& mp) {
-        unsigned int
-          ptrs = 4U,
-          ptrd = (unsigned int)mp.opcode[1] + 1,
-          siz = (unsigned int)mp.opcode[3];
-        switch (mp.opcode[2] - 4) {
-        case 0 : std::memset(mp.mem._data + ptrd,0,siz*sizeof(double)); break; // 0 values given
-        case 1 : { const double val = _mp_arg(ptrs); while (siz-->0) mp.mem[ptrd++] = val; } break;
-        default : while (siz-->0) { mp.mem[ptrd++] = _mp_arg(ptrs++); if (ptrs>=mp.opcode[2]) ptrs = 4U; }
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_eq(_cimg_math_parser& mp) {
-        const double
-          *ptr1 = &_mp_arg(2) + 1,
-          *ptr2 = &_mp_arg(4) + 1;
-        unsigned int p1 = (unsigned int)mp.opcode[3], p2 = (unsigned int)mp.opcode[5], n;
-        const int N = (int)_mp_arg(6);
-        const bool case_sensitive = (bool)_mp_arg(7);
-        bool still_equal = true;
-        double value;
-        if (!N) return true;
-
-        // Compare all values.
-        if (N<0) {
-          if (p1>0 && p2>0) { // Vector == vector
-            if (p1!=p2) return false;
-            if (case_sensitive)
-              while (still_equal && p1--) still_equal = *(ptr1++)==*(ptr2++);
-            else
-              while (still_equal && p1--)
-                still_equal = cimg::lowercase(*(ptr1++))==cimg::lowercase(*(ptr2++));
-            return still_equal;
-          } else if (p1>0 && !p2) { // Vector == scalar
-            value = _mp_arg(4);
-            if (!case_sensitive) value = cimg::lowercase(value);
-            while (still_equal && p1--) still_equal = *(ptr1++)==value;
-            return still_equal;
-          } else if (!p1 && p2>0) { // Scalar == vector
-            value = _mp_arg(2);
-            if (!case_sensitive) value = cimg::lowercase(value);
-            while (still_equal && p2--) still_equal = *(ptr2++)==value;
-            return still_equal;
-          } else { // Scalar == scalar
-            if (case_sensitive) return _mp_arg(2)==_mp_arg(4);
-            else return cimg::lowercase(_mp_arg(2))==cimg::lowercase(_mp_arg(4));
-          }
-        }
-
-        // Compare only first N values.
-        if (p1>0 && p2>0) { // Vector == vector
-          n = cimg::min((unsigned int)N,p1,p2);
-          if (case_sensitive)
-            while (still_equal && n--) still_equal = *(ptr1++)==(*ptr2++);
-          else
-            while (still_equal && n--) still_equal = cimg::lowercase(*(ptr1++))==cimg::lowercase(*(ptr2++));
-          return still_equal;
-        } else if (p1>0 && !p2) { // Vector == scalar
-          n = std::min((unsigned int)N,p1);
-          value = _mp_arg(4);
-          if (!case_sensitive) value = cimg::lowercase(value);
-          while (still_equal && n--) still_equal = *(ptr1++)==value;
-          return still_equal;
-        } else if (!p1 && p2>0) { // Scalar == vector
-          n = std::min((unsigned int)N,p2);
-          value = _mp_arg(2);
-          if (!case_sensitive) value = cimg::lowercase(value);
-          while (still_equal && n--) still_equal = *(ptr2++)==value;
-          return still_equal;
-        }  // Scalar == scalar
-        if (case_sensitive) return _mp_arg(2)==_mp_arg(4);
-        return cimg::lowercase(_mp_arg(2))==cimg::lowercase(_mp_arg(4));
-      }
-
-      static double mp_vector_off(_cimg_math_parser& mp) {
-        const unsigned int
-          ptr = (unsigned int)mp.opcode[2] + 1,
-          siz = (unsigned int)mp.opcode[3];
-        const int off = (int)_mp_arg(4);
-        return off>=0 && off<(int)siz?mp.mem[ptr + off]:cimg::type<double>::nan();
-      }
-
-      static double mp_vector_map_sv(_cimg_math_parser& mp) { // Operator(scalar,vector)
-        unsigned int
-          siz = (unsigned int)mp.opcode[2],
-          ptrs = (unsigned int)mp.opcode[5] + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(4);
-        l_opcode[2] = mp.opcode[4]; // Scalar argument1
-        l_opcode.swap(mp.opcode);
-        ulongT &argument2 = mp.opcode[3];
-        while (siz-->0) { argument2 = ptrs++; *(ptrd++) = (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_map_v(_cimg_math_parser& mp) { // Operator(vector)
-        unsigned int
-          siz = (unsigned int)mp.opcode[2],
-          ptrs = (unsigned int)mp.opcode[4] + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,3);
-        l_opcode.swap(mp.opcode);
-        ulongT &argument = mp.opcode[2];
-        while (siz-->0) { argument = ptrs++; *(ptrd++) = (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_map_vs(_cimg_math_parser& mp) { // Operator(vector,scalar)
-        unsigned int
-          siz = (unsigned int)mp.opcode[2],
-          ptrs = (unsigned int)mp.opcode[4] + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,4);
-        l_opcode[3] = mp.opcode[5]; // Scalar argument2
-        l_opcode.swap(mp.opcode);
-        ulongT &argument1 = mp.opcode[2];
-        while (siz-->0) { argument1 = ptrs++; *(ptrd++) = (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_map_vss(_cimg_math_parser& mp) { // Operator(vector,scalar,scalar)
-        unsigned int
-          siz = (unsigned int)mp.opcode[2],
-          ptrs = (unsigned int)mp.opcode[4] + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,5);
-        l_opcode[3] = mp.opcode[5]; // Scalar argument2
-        l_opcode[4] = mp.opcode[6]; // Scalar argument3
-        l_opcode.swap(mp.opcode);
-        ulongT &argument1 = mp.opcode[2];
-        while (siz-->0) { argument1 = ptrs++; *(ptrd++) = (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_map_vv(_cimg_math_parser& mp) { // Operator(vector,vector)
-        unsigned int
-          siz = (unsigned int)mp.opcode[2],
-          ptrs1 = (unsigned int)mp.opcode[4] + 1,
-          ptrs2 = (unsigned int)mp.opcode[5] + 1;
-        double *ptrd = &_mp_arg(1) + 1;
-        mp_func op = (mp_func)mp.opcode[3];
-        CImg<ulongT> l_opcode(1,4);
-        l_opcode.swap(mp.opcode);
-        ulongT &argument1 = mp.opcode[2], &argument2 = mp.opcode[3];
-        while (siz-->0) { argument1 = ptrs1++; argument2 = ptrs2++; *(ptrd++) = (*op)(mp); }
-        l_opcode.swap(mp.opcode);
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_neq(_cimg_math_parser& mp) {
-        return !mp_vector_eq(mp);
-      }
-
-      static double mp_vector_print(_cimg_math_parser& mp) {
-        cimg_pragma_openmp(critical)
-        {
-          CImg<charT> expr(mp.opcode[2] - 4);
-          const ulongT *ptrs = mp.opcode._data + 4;
-          cimg_for(expr,ptrd,char) *ptrd = (char)*(ptrs++);
-          cimg::strellipsize(expr);
-          unsigned int
-            ptr = (unsigned int)mp.opcode[1] + 1,
-            siz0 = (unsigned int)mp.opcode[3],
-            siz = siz0;
-          cimg::mutex(6);
-          std::fprintf(cimg::output(),"\n[_cimg_math_parser] %s = [ ",expr._data);
-          unsigned int count = 0;
-          while (siz-->0) {
-            if (count>=64 && siz>=64) {
-              std::fprintf(cimg::output(),"...,");
-              ptr = (unsigned int)mp.opcode[1] + 1 + siz0 - 64;
-              siz = 64;
-            } else std::fprintf(cimg::output(),"%g%s",mp.mem[ptr++],siz?",":"");
-            ++count;
-          }
-          std::fprintf(cimg::output()," ] (size: %u)",siz0);
-          std::fflush(cimg::output());
-          cimg::mutex(6,0);
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_resize(_cimg_math_parser& mp) {
-        double *const ptrd = &_mp_arg(1) + 1;
-        const unsigned int p1 = (unsigned int)mp.opcode[2], p2 = (unsigned int)mp.opcode[4];
-        const int
-          interpolation = (int)_mp_arg(5),
-          boundary_conditions = (int)_mp_arg(6);
-        if (p2) { // Resize vector
-          const double *const ptrs = &_mp_arg(3) + 1;
-          CImg<doubleT>(ptrd,p1,1,1,1,true) = CImg<doubleT>(ptrs,p2,1,1,1,true).
-            get_resize(p1,1,1,1,interpolation,boundary_conditions);
-        } else { // Resize scalar
-          const double value = _mp_arg(3);
-          CImg<doubleT>(ptrd,p1,1,1,1,true) = CImg<doubleT>(1,1,1,1,value).resize(p1,1,1,1,interpolation,
-                                                                                  boundary_conditions);
-        }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_reverse(_cimg_math_parser& mp) {
-        double *const ptrd = &_mp_arg(1) + 1;
-        const double *const ptrs = &_mp_arg(2) + 1;
-        const unsigned int p1 = (unsigned int)mp.opcode[3];
-        CImg<doubleT>(ptrd,p1,1,1,1,true) = CImg<doubleT>(ptrs,p1,1,1,1,true).get_mirror('x');
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_vector_set_off(_cimg_math_parser& mp) {
-        const unsigned int
-          ptr = (unsigned int)mp.opcode[2] + 1,
-          siz = (unsigned int)mp.opcode[3];
-        const int off = (int)_mp_arg(4);
-        if (off>=0 && off<(int)siz) mp.mem[ptr + off] = _mp_arg(5);
-        return _mp_arg(5);
-      }
-
-      static double mp_whiledo(_cimg_math_parser& mp) {
-        const ulongT
-          mem_body = mp.opcode[1],
-          mem_cond = mp.opcode[2];
-        const CImg<ulongT>
-          *const p_cond = ++mp.p_code,
-          *const p_body = p_cond + mp.opcode[3],
-          *const p_end = p_body + mp.opcode[4];
-        const unsigned int vsiz = (unsigned int)mp.opcode[5];
-        bool is_cond = false;
-        if (mp.opcode[6]) { // Set default value for result and condition if necessary
-          if (vsiz) CImg<doubleT>(&mp.mem[mem_body] + 1,vsiz,1,1,1,true).fill(cimg::type<double>::nan());
-          else mp.mem[mem_body] = cimg::type<double>::nan();
-        }
-        if (mp.opcode[7]) mp.mem[mem_cond] = 0;
-        const unsigned int _break_type = mp.break_type;
-        mp.break_type = 0;
-        do {
-          for (mp.p_code = p_cond; mp.p_code<p_body; ++mp.p_code) { // Evaluate condition
-            mp.opcode._data = mp.p_code->_data;
-            const ulongT target = mp.opcode[1];
-            mp.mem[target] = _cimg_mp_defunc(mp);
-          }
-          if (mp.break_type==1) break;
-          is_cond = (bool)mp.mem[mem_cond];
-          if (is_cond && !mp.break_type) // Evaluate body
-            for (mp.p_code = p_body; mp.p_code<p_end; ++mp.p_code) {
-              mp.opcode._data = mp.p_code->_data;
-              const ulongT target = mp.opcode[1];
-              mp.mem[target] = _cimg_mp_defunc(mp);
-            }
-          if (mp.break_type==1) break; else if (mp.break_type==2) mp.break_type = 0;
-        } while (is_cond);
-
-        mp.break_type = _break_type;
-        mp.p_code = p_end - 1;
-        return mp.mem[mem_body];
-      }
-
-      static double mp_Ioff(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          boundary_conditions = (unsigned int)_mp_arg(3),
-          vsiz = (unsigned int)mp.opcode[4];
-        const CImg<T> &img = mp.imgin;
-        const longT
-          off = (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T *ptrs;
-        if (off>=0 && off<whd) {
-          ptrs = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-          return cimg::type<double>::nan();
-        }
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whd2 = 2*whd, moff = cimg::mod(off,whd2);
-            ptrs = &img[moff<whd?moff:whd2 - moff - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          }
-          case 2 : // Periodic
-            ptrs = &img[cimg::mod(off,whd)];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          case 1 : // Neumann
-            ptrs = off<0?&img[0]:&img[whd - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          default : // Dirichlet
-            std::memset(ptrd,0,vsiz*sizeof(double));
-            return cimg::type<double>::nan();
-          }
-        std::memset(ptrd,0,vsiz*sizeof(double));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_Ixyz(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          interpolation = (unsigned int)_mp_arg(5),
-          boundary_conditions = (unsigned int)_mp_arg(6),
-          vsiz = (unsigned int)mp.opcode[7];
-        const CImg<T> &img = mp.imgin;
-        const double x = _mp_arg(2), y = _mp_arg(3), z = _mp_arg(4);
-        const ulongT whd = (ulongT)img._width*img._height*img._depth;
-        const T *ptrs;
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2), mz = cimg::mod((int)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 2 : { // Periodic
-            const int
-              cx = cimg::mod((int)x,img.width()),
-              cy = cimg::mod((int)y,img.height()),
-              cz = cimg::mod((int)z,img.depth());
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 1 : { // Neumann
-            ptrs = &img._atXYZ((int)x,(int)y,(int)z);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          default : // Dirichlet
-            if (img.containsXYZC(x,y,z)) {
-              ptrs = &img((int)x,(int)y,(int)z);
-              cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-            } else std::memset(ptrd,0,vsiz*sizeof(double));
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2), mz = cimg::mod((float)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 2 : { // Periodic
-            const float
-              cx = cimg::mod((float)x,(float)img.width()),
-              cy = cimg::mod((float)y,(float)img.height()),
-              cz = cimg::mod((float)z,(float)img.depth());
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 1 : // Neumann
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ((float)x,(float)y,(float)z,c);
-            break;
-          default : // Dirichlet
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img.linear_atXYZ((float)x,(float)y,(float)z,c,(T)0);
-          }
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_Joff(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          boundary_conditions = (unsigned int)_mp_arg(3),
-          vsiz = (unsigned int)mp.opcode[4];
-        const CImg<T> &img = mp.imgin;
-        const int
-          ox = (int)mp.mem[_cimg_mp_slot_x],
-          oy = (int)mp.mem[_cimg_mp_slot_y],
-          oz = (int)mp.mem[_cimg_mp_slot_z];
-        const longT
-          off = img.offset(ox,oy,oz) + (longT)_mp_arg(2),
-          whd = (longT)img.width()*img.height()*img.depth();
-        const T *ptrs;
-        if (off>=0 && off<whd) {
-          ptrs = &img[off];
-          cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-          return cimg::type<double>::nan();
-        }
-        if (img._data) switch (boundary_conditions) {
-          case 3 : { // Mirror
-            const longT whd2 = 2*whd, moff = cimg::mod(off,whd2);
-            ptrs = &img[moff<whd?moff:whd2 - moff - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          }
-          case 2 : // Periodic
-            ptrs = &img[cimg::mod(off,whd)];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          case 1 : // Neumann
-            ptrs = off<0?&img[0]:&img[whd - 1];
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-            return cimg::type<double>::nan();
-          default : // Dirichlet
-            std::memset(ptrd,0,vsiz*sizeof(double));
-            return cimg::type<double>::nan();
-          }
-        std::memset(ptrd,0,vsiz*sizeof(double));
-        return cimg::type<double>::nan();
-      }
-
-      static double mp_Jxyz(_cimg_math_parser& mp) {
-        double *ptrd = &_mp_arg(1) + 1;
-        const unsigned int
-          interpolation = (unsigned int)_mp_arg(5),
-          boundary_conditions = (unsigned int)_mp_arg(6),
-          vsiz = (unsigned int)mp.opcode[7];
-        const CImg<T> &img = mp.imgin;
-        const double
-          ox = mp.mem[_cimg_mp_slot_x], oy = mp.mem[_cimg_mp_slot_y], oz = mp.mem[_cimg_mp_slot_z],
-          x = ox + _mp_arg(2), y = oy + _mp_arg(3), z = oz + _mp_arg(4);
-        const ulongT whd = (ulongT)img._width*img._height*img._depth;
-        const T *ptrs;
-        if (interpolation==0) switch (boundary_conditions) { // Nearest neighbor interpolation
-          case 3 : { // Mirror
-            const int
-              w2 = 2*img.width(), h2 = 2*img.height(), d2 = 2*img.depth(),
-              mx = cimg::mod((int)x,w2), my = cimg::mod((int)y,h2), mz = cimg::mod((int)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 2 : { // Periodic
-            const int
-              cx = cimg::mod((int)x,img.width()),
-              cy = cimg::mod((int)y,img.height()),
-              cz = cimg::mod((int)z,img.depth());
-            ptrs = &img(cx,cy,cz);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          case 1 : { // Neumann
-            ptrs = &img._atXYZ((int)x,(int)y,(int)z);
-            cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-          } break;
-          default : // Dirichlet
-            if (img.containsXYZC(x,y,z)) {
-              ptrs = &img((int)x,(int)y,(int)z);
-              cimg_for_inC(img,0,vsiz - 1,c) { *(ptrd++) = (double)*ptrs; ptrs+=whd; }
-            } else std::memset(ptrd,0,vsiz*sizeof(double));
-          } else switch (boundary_conditions) { // Linear interpolation
-          case 3 : { // Mirror
-            const float
-              w2 = 2.0f*img.width(), h2 = 2.0f*img.height(), d2 = 2.0f*img.depth(),
-              mx = cimg::mod((float)x,w2), my = cimg::mod((float)y,h2), mz = cimg::mod((float)z,d2),
-              cx = mx<img.width()?mx:w2 - mx - 1,
-              cy = my<img.height()?my:h2 - my - 1,
-              cz = mz<img.depth()?mz:d2 - mz - 1;
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 2 : { // Periodic
-            const float
-              cx = cimg::mod((float)x,(float)img.width()),
-              cy = cimg::mod((float)y,(float)img.height()),
-              cz = cimg::mod((float)z,(float)img.depth());
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ(cx,cy,cz,c);
-          } break;
-          case 1 : // Neumann
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img._linear_atXYZ((float)x,(float)y,(float)z,c);
-            break;
-          default : // Dirichlet
-            cimg_for_inC(img,0,vsiz - 1,c) *(ptrd++) = (double)img.linear_atXYZ((float)x,(float)y,(float)z,c,(T)0);
-          }
-        return cimg::type<double>::nan();
-      }
-
-#undef _mp_arg
-
-    }; // struct _cimg_math_parser {}
-
-    //! Compute the square value of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its square value \f$I_{(x,y,z,c)}^2\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");
-       (img,img.get_sqr().normalize(0,255)).display();
-       \endcode
-       \image html ref_sqr.jpg
-    **/
-    CImg<T>& sqr() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(val*val); };
-      return *this;
-    }
-
-    //! Compute the square value of each pixel value \newinstance.
-    CImg<Tfloat> get_sqr() const {
-      return CImg<Tfloat>(*this,false).sqr();
-    }
-
-    //! Compute the square root of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its square root \f$\sqrt{I_{(x,y,z,c)}}\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");
-       (img,img.get_sqrt().normalize(0,255)).display();
-       \endcode
-       \image html ref_sqrt.jpg
-    **/
-    CImg<T>& sqrt() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::sqrt((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the square root of each pixel value \newinstance.
-    CImg<Tfloat> get_sqrt() const {
-      return CImg<Tfloat>(*this,false).sqrt();
-    }
-
-    //! Compute the exponential of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its exponential \f$e^{I_{(x,y,z,c)}}\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& exp() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=4096))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::exp((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the exponential of each pixel value \newinstance.
-    CImg<Tfloat> get_exp() const {
-      return CImg<Tfloat>(*this,false).exp();
-    }
-
-    //! Compute the logarithm of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its logarithm
-       \f$\mathrm{log}_{e}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& log() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=262144))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::log((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the logarithm of each pixel value \newinstance.
-    CImg<Tfloat> get_log() const {
-      return CImg<Tfloat>(*this,false).log();
-    }
-
-    //! Compute the base-2 logarithm of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its base-2 logarithm
-       \f$\mathrm{log}_{2}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& log2() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=4096))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::log2((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the base-10 logarithm of each pixel value \newinstance.
-    CImg<Tfloat> get_log2() const {
-      return CImg<Tfloat>(*this,false).log2();
-    }
-
-    //! Compute the base-10 logarithm of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its base-10 logarithm
-       \f$\mathrm{log}_{10}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& log10() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=4096))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::log10((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the base-10 logarithm of each pixel value \newinstance.
-    CImg<Tfloat> get_log10() const {
-      return CImg<Tfloat>(*this,false).log10();
-    }
-
-    //! Compute the absolute value of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its absolute value \f$|I_{(x,y,z,c)}|\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& abs() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=524288))
-      cimg_rof(*this,ptrd,T) *ptrd = cimg::abs(*ptrd);
-      return *this;
-    }
-
-    //! Compute the absolute value of each pixel value \newinstance.
-    CImg<Tfloat> get_abs() const {
-      return CImg<Tfloat>(*this,false).abs();
-    }
-
-    //! Compute the sign of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its sign
-       \f$\mathrm{sign}(I_{(x,y,z,c)})\f$.
-       \note
-       - The sign is set to:
-         - \c 1 if pixel value is strictly positive.
-         - \c -1 if pixel value is strictly negative.
-         - \c 0 if pixel value is equal to \c 0.
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& sign() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = cimg::sign(*ptrd);
-      return *this;
-    }
-
-    //! Compute the sign of each pixel value \newinstance.
-    CImg<Tfloat> get_sign() const {
-      return CImg<Tfloat>(*this,false).sign();
-    }
-
-    //! Compute the cosine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its cosine \f$\cos(I_{(x,y,z,c)})\f$.
-       \note
-       - Pixel values are regarded as being in \e radian.
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& cos() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::cos((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the cosine of each pixel value \newinstance.
-    CImg<Tfloat> get_cos() const {
-      return CImg<Tfloat>(*this,false).cos();
-    }
-
-    //! Compute the sine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its sine \f$\sin(I_{(x,y,z,c)})\f$.
-       \note
-       - Pixel values are regarded as being in \e radian.
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& sin() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::sin((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the sine of each pixel value \newinstance.
-    CImg<Tfloat> get_sin() const {
-      return CImg<Tfloat>(*this,false).sin();
-    }
-
-    //! Compute the sinc of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its sinc
-       \f$\mathrm{sinc}(I_{(x,y,z,c)})\f$.
-       \note
-       - Pixel values are regarded as being exin \e radian.
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& sinc() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=2048))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::sinc((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the sinc of each pixel value \newinstance.
-    CImg<Tfloat> get_sinc() const {
-      return CImg<Tfloat>(*this,false).sinc();
-    }
-
-    //! Compute the tangent of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its tangent \f$\tan(I_{(x,y,z,c)})\f$.
-       \note
-       - Pixel values are regarded as being exin \e radian.
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& tan() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=2048))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::tan((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the tangent of each pixel value \newinstance.
-    CImg<Tfloat> get_tan() const {
-      return CImg<Tfloat>(*this,false).tan();
-    }
-
-    //! Compute the hyperbolic cosine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its hyperbolic cosine
-       \f$\mathrm{cosh}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& cosh() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=2048))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::cosh((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the hyperbolic cosine of each pixel value \newinstance.
-    CImg<Tfloat> get_cosh() const {
-      return CImg<Tfloat>(*this,false).cosh();
-    }
-
-    //! Compute the hyperbolic sine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its hyperbolic sine
-       \f$\mathrm{sinh}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& sinh() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=2048))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::sinh((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the hyperbolic sine of each pixel value \newinstance.
-    CImg<Tfloat> get_sinh() const {
-      return CImg<Tfloat>(*this,false).sinh();
-    }
-
-    //! Compute the hyperbolic tangent of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its hyperbolic tangent
-       \f$\mathrm{tanh}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& tanh() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=2048))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::tanh((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the hyperbolic tangent of each pixel value \newinstance.
-    CImg<Tfloat> get_tanh() const {
-      return CImg<Tfloat>(*this,false).tanh();
-    }
-
-    //! Compute the arccosine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its arccosine
-       \f$\mathrm{acos}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& acos() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::acos((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the arccosine of each pixel value \newinstance.
-    CImg<Tfloat> get_acos() const {
-      return CImg<Tfloat>(*this,false).acos();
-    }
-
-    //! Compute the arcsine of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its arcsine
-       \f$\mathrm{asin}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& asin() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::asin((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the arcsine of each pixel value \newinstance.
-    CImg<Tfloat> get_asin() const {
-      return CImg<Tfloat>(*this,false).asin();
-    }
-
-    //! Compute the arctangent of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its arctangent
-       \f$\mathrm{atan}(I_{(x,y,z,c)})\f$.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-    **/
-    CImg<T>& atan() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::atan((double)*ptrd);
-      return *this;
-    }
-
-    //! Compute the arctangent of each pixel value \newinstance.
-    CImg<Tfloat> get_atan() const {
-      return CImg<Tfloat>(*this,false).atan();
-    }
-
-    //! Compute the arctangent2 of each pixel value.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its arctangent2
-       \f$\mathrm{atan2}(I_{(x,y,z,c)})\f$.
-       \param img Image whose pixel values specify the second argument of the \c atan2() function.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-       \par Example
-       \code
-       const CImg<float>
-          img_x(100,100,1,1,"x-w/2",false),   // Define an horizontal centered gradient, from '-width/2' to 'width/2'.
-          img_y(100,100,1,1,"y-h/2",false),   // Define a vertical centered gradient, from '-height/2' to 'height/2'.
-          img_atan2 = img_y.get_atan2(img_x); // Compute atan2(y,x) for each pixel value.
-       (img_x,img_y,img_atan2).display();
-       \endcode
-    **/
-    template<typename t>
-    CImg<T>& atan2(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return atan2(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)std::atan2((double)*ptrd,(double)*(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)std::atan2((double)*ptrd,(double)*(ptrs++));
-      }
-      return *this;
-    }
-
-    //! Compute the arctangent2 of each pixel value \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_atan2(const CImg<t>& img) const {
-      return CImg<Tfloat>(*this,false).atan2(img);
-    }
-
-    //! In-place pointwise multiplication.
-    /**
-       Compute the pointwise multiplication between the image instance and the specified input image \c img.
-       \param img Input image, as the second operand of the multiplication.
-       \note
-       - Similar to operator+=(const CImg<t>&), except that it performs a pointwise multiplication
-         instead of an addition.
-       - It does \e not perform a \e matrix multiplication. For this purpose, use operator*=(const CImg<t>&) instead.
-       \par Example
-       \code
-       CImg<float>
-         img("reference.jpg"),
-         shade(img.width,img.height(),1,1,"-(x-w/2)^2-(y-h/2)^2",false);
-       shade.normalize(0,1);
-       (img,shade,img.get_mul(shade)).display();
-       \endcode
-    **/
-    template<typename t>
-    CImg<T>& mul(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return mul(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)(*ptrd * *(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd * *(ptrs++));
-      }
-      return *this;
-    }
-
-    //! In-place pointwise multiplication \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_mul(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false).mul(img);
-    }
-
-    //! In-place pointwise division.
-    /**
-       Similar to mul(const CImg<t>&), except that it performs a pointwise division instead of a multiplication.
-    **/
-    template<typename t>
-    CImg<T>& div(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return div(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)(*ptrd / *(ptrs++));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd / *(ptrs++));
-      }
-      return *this;
-    }
-
-    //! In-place pointwise division \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_div(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false).div(img);
-    }
-
-    //! Raise each pixel value to a specified power.
-    /**
-       Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by its power \f$I_{(x,y,z,c)}^p\f$.
-       \param p Exponent value.
-       \note
-       - The \inplace of this method statically casts the computed values to the pixel type \c T.
-       - The \newinstance returns a \c CImg<float> image, if the pixel type \c T is \e not float-valued.
-       \par Example
-       \code
-       const CImg<float>
-         img0("reference.jpg"),           // Load reference color image.
-         img1 = (img0/255).pow(1.8)*=255, // Compute gamma correction, with gamma = 1.8.
-         img2 = (img0/255).pow(0.5)*=255; // Compute gamma correction, with gamma = 0.5.
-       (img0,img1,img2).display();
-       \endcode
-    **/
-    CImg<T>& pow(const double p) {
-      if (is_empty()) return *this;
-      if (p==-4) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(1.0/(val*val*val*val)); }
-        return *this;
-      }
-      if (p==-3) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(1.0/(val*val*val)); }
-        return *this;
-      }
-      if (p==-2) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(1.0/(val*val)); }
-        return *this;
-      }
-      if (p==-1) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(1.0/val); }
-        return *this;
-      }
-      if (p==-0.5) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(1/std::sqrt((double)val)); }
-        return *this;
-      }
-      if (p==0) return fill((T)1);
-      if (p==0.25) return sqrt().sqrt();
-      if (p==0.5) return sqrt();
-      if (p==1) return *this;
-      if (p==2) return sqr();
-      if (p==3) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=262144))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = val*val*val; }
-        return *this;
-      }
-      if (p==4) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=131072))
-        cimg_rof(*this,ptrd,T) { const T val = *ptrd; *ptrd = val*val*val*val; }
-        return *this;
-      }
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=1024))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)std::pow((double)*ptrd,p);
-      return *this;
-    }
-
-    //! Raise each pixel value to a specified power \newinstance.
-    CImg<Tfloat> get_pow(const double p) const {
-      return CImg<Tfloat>(*this,false).pow(p);
-    }
-
-    //! Raise each pixel value to a power, specified from an expression.
-    /**
-       Similar to operator+=(const char*), except it performs a pointwise exponentiation instead of an addition.
-    **/
-    CImg<T>& pow(const char *const expression) {
-      return pow((+*this)._fill(expression,true,true,0,0,"pow",this));
-    }
-
-    //! Raise each pixel value to a power, specified from an expression \newinstance.
-    CImg<Tfloat> get_pow(const char *const expression) const {
-      return CImg<Tfloat>(*this,false).pow(expression);
-    }
-
-    //! Raise each pixel value to a power, pointwisely specified from another image.
-    /**
-       Similar to operator+=(const CImg<t>& img), except that it performs an exponentiation instead of an addition.
-    **/
-    template<typename t>
-    CImg<T>& pow(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return pow(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)std::pow((double)*ptrd,(double)(*(ptrs++)));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)std::pow((double)*ptrd,(double)(*(ptrs++)));
-      }
-      return *this;
-    }
-
-    //! Raise each pixel value to a power, pointwisely specified from another image \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_pow(const CImg<t>& img) const {
-      return CImg<Tfloat>(*this,false).pow(img);
-    }
-
-    //! Compute the bitwise left rotation of each pixel value.
-    /**
-       Similar to operator<<=(unsigned int), except that it performs a left rotation instead of a left shift.
-    **/
-    CImg<T>& rol(const unsigned int n=1) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::rol(*ptrd,n);
-      return *this;
-    }
-
-    //! Compute the bitwise left rotation of each pixel value \newinstance.
-    CImg<T> get_rol(const unsigned int n=1) const {
-      return (+*this).rol(n);
-    }
-
-    //! Compute the bitwise left rotation of each pixel value.
-    /**
-       Similar to operator<<=(const char*), except that it performs a left rotation instead of a left shift.
-    **/
-    CImg<T>& rol(const char *const expression) {
-      return rol((+*this)._fill(expression,true,true,0,0,"rol",this));
-    }
-
-    //! Compute the bitwise left rotation of each pixel value \newinstance.
-    CImg<T> get_rol(const char *const expression) const {
-      return (+*this).rol(expression);
-    }
-
-    //! Compute the bitwise left rotation of each pixel value.
-    /**
-       Similar to operator<<=(const CImg<t>&), except that it performs a left rotation instead of a left shift.
-    **/
-    template<typename t>
-    CImg<T>& rol(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return rol(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)cimg::rol(*ptrd,(unsigned int)(*(ptrs++)));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)cimg::rol(*ptrd,(unsigned int)(*(ptrs++)));
-      }
-      return *this;
-    }
-
-    //! Compute the bitwise left rotation of each pixel value \newinstance.
-    template<typename t>
-    CImg<T> get_rol(const CImg<t>& img) const {
-      return (+*this).rol(img);
-    }
-
-    //! Compute the bitwise right rotation of each pixel value.
-    /**
-       Similar to operator>>=(unsigned int), except that it performs a right rotation instead of a right shift.
-    **/
-    CImg<T>& ror(const unsigned int n=1) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::ror(*ptrd,n);
-      return *this;
-    }
-
-    //! Compute the bitwise right rotation of each pixel value \newinstance.
-    CImg<T> get_ror(const unsigned int n=1) const {
-      return (+*this).ror(n);
-    }
-
-    //! Compute the bitwise right rotation of each pixel value.
-    /**
-       Similar to operator>>=(const char*), except that it performs a right rotation instead of a right shift.
-    **/
-    CImg<T>& ror(const char *const expression) {
-      return ror((+*this)._fill(expression,true,true,0,0,"ror",this));
-    }
-
-    //! Compute the bitwise right rotation of each pixel value \newinstance.
-    CImg<T> get_ror(const char *const expression) const {
-      return (+*this).ror(expression);
-    }
-
-    //! Compute the bitwise right rotation of each pixel value.
-    /**
-       Similar to operator>>=(const CImg<t>&), except that it performs a right rotation instead of a right shift.
-    **/
-    template<typename t>
-    CImg<T>& ror(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return ror(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = (T)cimg::ror(*ptrd,(unsigned int)(*(ptrs++)));
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)cimg::ror(*ptrd,(unsigned int)(*(ptrs++)));
-      }
-      return *this;
-    }
-
-    //! Compute the bitwise right rotation of each pixel value \newinstance.
-    template<typename t>
-    CImg<T> get_ror(const CImg<t>& img) const {
-      return (+*this).ror(img);
-    }
-
-    //! Pointwise min operator between instance image and a value.
-    /**
-       \param val Value used as the reference argument of the min operator.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{min}(I_{(x,y,z,c)},\mathrm{val})\f$.
-     **/
-    CImg<T>& min(const T& val) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-      cimg_rof(*this,ptrd,T) *ptrd = std::min(*ptrd,val);
-      return *this;
-    }
-
-    //! Pointwise min operator between instance image and a value \newinstance.
-    CImg<T> get_min(const T& val) const {
-      return (+*this).min(val);
-    }
-
-    //! Pointwise min operator between two images.
-    /**
-       \param img Image used as the reference argument of the min operator.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{min}(I_{(x,y,z,c)},\mathrm{img}_{(x,y,z,c)})\f$.
-     **/
-    template<typename t>
-    CImg<T>& min(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return min(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = std::min((T)*(ptrs++),*ptrd);
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = std::min((T)*(ptrs++),*ptrd);
-      }
-      return *this;
-    }
-
-    //! Pointwise min operator between two images \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_min(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false).min(img);
-    }
-
-    //! Pointwise min operator between an image and an expression.
-    /**
-       \param expression Math formula as a C-string.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{min}(I_{(x,y,z,c)},\mathrm{expr}_{(x,y,z,c)})\f$.
-    **/
-    CImg<T>& min(const char *const expression) {
-      return min((+*this)._fill(expression,true,true,0,0,"min",this));
-    }
-
-    //! Pointwise min operator between an image and an expression \newinstance.
-    CImg<Tfloat> get_min(const char *const expression) const {
-      return CImg<Tfloat>(*this,false).min(expression);
-    }
-
-    //! Pointwise max operator between instance image and a value.
-    /**
-       \param val Value used as the reference argument of the max operator.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{max}(I_{(x,y,z,c)},\mathrm{val})\f$.
-     **/
-    CImg<T>& max(const T& val) {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-      cimg_rof(*this,ptrd,T) *ptrd = std::max(*ptrd,val);
-      return *this;
-    }
-
-    //! Pointwise max operator between instance image and a value \newinstance.
-    CImg<T> get_max(const T& val) const {
-      return (+*this).max(val);
-    }
-
-    //! Pointwise max operator between two images.
-    /**
-       \param img Image used as the reference argument of the max operator.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{max}(I_{(x,y,z,c)},\mathrm{img}_{(x,y,z,c)})\f$.
-     **/
-    template<typename t>
-    CImg<T>& max(const CImg<t>& img) {
-      const ulongT siz = size(), isiz = img.size();
-      if (siz && isiz) {
-        if (is_overlapped(img)) return max(+img);
-        T *ptrd = _data, *const ptre = _data + siz;
-        if (siz>isiz) for (ulongT n = siz/isiz; n; --n)
-          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd)
-            *ptrd = std::max((T)*(ptrs++),*ptrd);
-        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = std::max((T)*(ptrs++),*ptrd);
-      }
-      return *this;
-    }
-
-    //! Pointwise max operator between two images \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_max(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this,false).max(img);
-    }
-
-    //! Pointwise max operator between an image and an expression.
-    /**
-       \param expression Math formula as a C-string.
-       \note Replace each pixel value \f$I_{(x,y,z,c)}\f$ of the image instance by
-       \f$\mathrm{max}(I_{(x,y,z,c)},\mathrm{expr}_{(x,y,z,c)})\f$.
-    **/
-    CImg<T>& max(const char *const expression) {
-      return max((+*this)._fill(expression,true,true,0,0,"max",this));
-    }
-
-    //! Pointwise max operator between an image and an expression \newinstance.
-    CImg<Tfloat> get_max(const char *const expression) const {
-      return CImg<Tfloat>(*this,false).max(expression);
-    }
-
-    //! Return a reference to the minimum pixel value.
-    /**
-     **/
-    T& min() {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "min(): Empty instance.",
-                                    cimg_instance);
-      T *ptr_min = _data;
-      T min_value = *ptr_min;
-      cimg_for(*this,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
-      return *ptr_min;
-    }
-
-    //! Return a reference to the minimum pixel value \const.
-    const T& min() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "min(): Empty instance.",
-                                    cimg_instance);
-      const T *ptr_min = _data;
-      T min_value = *ptr_min;
-      cimg_for(*this,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
-      return *ptr_min;
-    }
-
-    //! Return a reference to the maximum pixel value.
-    /**
-     **/
-    T& max() {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "max(): Empty instance.",
-                                    cimg_instance);
-      T *ptr_max = _data;
-      T max_value = *ptr_max;
-      cimg_for(*this,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
-      return *ptr_max;
-    }
-
-    //! Return a reference to the maximum pixel value \const.
-    const T& max() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "max(): Empty instance.",
-                                    cimg_instance);
-      const T *ptr_max = _data;
-      T max_value = *ptr_max;
-      cimg_for(*this,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
-      return *ptr_max;
-    }
-
-    //! Return a reference to the minimum pixel value as well as the maximum pixel value.
-    /**
-       \param[out] max_val Maximum pixel value.
-    **/
-    template<typename t>
-    T& min_max(t& max_val) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "min_max(): Empty instance.",
-                                    cimg_instance);
-      T *ptr_min = _data;
-      T min_value = *ptr_min, max_value = min_value;
-      cimg_for(*this,ptrs,T) {
-        const T val = *ptrs;
-        if (val<min_value) { min_value = val; ptr_min = ptrs; }
-        if (val>max_value) max_value = val;
-      }
-      max_val = (t)max_value;
-      return *ptr_min;
-    }
-
-    //! Return a reference to the minimum pixel value as well as the maximum pixel value \const.
-    template<typename t>
-    const T& min_max(t& max_val) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "min_max(): Empty instance.",
-                                    cimg_instance);
-      const T *ptr_min = _data;
-      T min_value = *ptr_min, max_value = min_value;
-      cimg_for(*this,ptrs,T) {
-        const T val = *ptrs;
-        if (val<min_value) { min_value = val; ptr_min = ptrs; }
-        if (val>max_value) max_value = val;
-      }
-      max_val = (t)max_value;
-      return *ptr_min;
-    }
-
-    //! Return a reference to the maximum pixel value as well as the minimum pixel value.
-    /**
-       \param[out] min_val Minimum pixel value.
-    **/
-    template<typename t>
-    T& max_min(t& min_val) {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "max_min(): Empty instance.",
-                                    cimg_instance);
-      T *ptr_max = _data;
-      T max_value = *ptr_max, min_value = max_value;
-      cimg_for(*this,ptrs,T) {
-        const T val = *ptrs;
-        if (val>max_value) { max_value = val; ptr_max = ptrs; }
-        if (val<min_value) min_value = val;
-      }
-      min_val = (t)min_value;
-      return *ptr_max;
-    }
-
-    //! Return a reference to the maximum pixel value as well as the minimum pixel value \const.
-    template<typename t>
-    const T& max_min(t& min_val) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "max_min(): Empty instance.",
-                                    cimg_instance);
-      const T *ptr_max = _data;
-      T max_value = *ptr_max, min_value = max_value;
-      cimg_for(*this,ptrs,T) {
-        const T val = *ptrs;
-        if (val>max_value) { max_value = val; ptr_max = ptrs; }
-        if (val<min_value) min_value = val;
-      }
-      min_val = (t)min_value;
-      return *ptr_max;
-    }
-
-    //! Return the kth smallest pixel value.
-    /**
-       \param k Rank of the search smallest element.
-    **/
-    T kth_smallest(const ulongT k) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "kth_smallest(): Empty instance.",
-                                    cimg_instance);
-      CImg<T> arr(*this);
-      ulongT l = 0, ir = size() - 1;
-      for ( ; ; ) {
-        if (ir<=l + 1) {
-          if (ir==l + 1 && arr[ir]<arr[l]) cimg::swap(arr[l],arr[ir]);
-          return arr[k];
-        } else {
-          const ulongT mid = (l + ir)>>1;
-          cimg::swap(arr[mid],arr[l + 1]);
-          if (arr[l]>arr[ir]) cimg::swap(arr[l],arr[ir]);
-          if (arr[l + 1]>arr[ir]) cimg::swap(arr[l + 1],arr[ir]);
-          if (arr[l]>arr[l + 1]) cimg::swap(arr[l],arr[l + 1]);
-          ulongT i = l + 1, j = ir;
-          const T pivot = arr[l + 1];
-          for ( ; ; ) {
-            do ++i; while (arr[i]<pivot);
-            do --j; while (arr[j]>pivot);
-            if (j<i) break;
-            cimg::swap(arr[i],arr[j]);
-          }
-          arr[l + 1] = arr[j];
-          arr[j] = pivot;
-          if (j>=k) ir = j - 1;
-          if (j<=k) l = i;
-        }
-      }
-    }
-
-    //! Return the median pixel value.
-    /**
-     **/
-    T median() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "median(): Empty instance.",
-                                    cimg_instance);
-      const ulongT s = size();
-      switch (s) {
-      case 1 : return _data[0];
-      case 2 : return cimg::median(_data[0],_data[1]);
-      case 3 : return cimg::median(_data[0],_data[1],_data[2]);
-      case 5 : return cimg::median(_data[0],_data[1],_data[2],_data[3],_data[4]);
-      case 7 : return cimg::median(_data[0],_data[1],_data[2],_data[3],_data[4],_data[5],_data[6]);
-      case 9 : return cimg::median(_data[0],_data[1],_data[2],_data[3],_data[4],_data[5],_data[6],_data[7],_data[8]);
-      case 13 : return cimg::median(_data[0],_data[1],_data[2],_data[3],_data[4],_data[5],_data[6],_data[7],_data[8],
-                                    _data[9],_data[10],_data[11],_data[12]);
-      }
-      const T res = kth_smallest(s>>1);
-      return (s%2)?res:(T)((res + kth_smallest((s>>1) - 1))/2);
-    }
-
-    //! Return the product of all the pixel values.
-    /**
-     **/
-    double product() const {
-      if (is_empty()) return 0;
-      double res = 1;
-      cimg_for(*this,ptrs,T) res*=(double)*ptrs;
-      return res;
-    }
-
-    //! Return the sum of all the pixel values.
-    /**
-     **/
-    double sum() const {
-      double res = 0;
-      cimg_for(*this,ptrs,T) res+=(double)*ptrs;
-      return res;
-    }
-
-    //! Return the average pixel value.
-    /**
-     **/
-    double mean() const {
-      double res = 0;
-      cimg_for(*this,ptrs,T) res+=(double)*ptrs;
-      return res/size();
-    }
-
-    //! Return the variance of the pixel values.
-    /**
-       \param variance_method Method used to estimate the variance. Can be:
-       - \c 0: Second moment, computed as
-       \f$1/N \sum\limits_{k=1}^{N} (x_k - \bar x)^2 =
-       1/N \left( \sum\limits_{k=1}^N x_k^2 - \left( \sum\limits_{k=1}^N x_k \right)^2 / N \right)\f$
-       with \f$ \bar x = 1/N \sum\limits_{k=1}^N x_k \f$.
-       - \c 1: Best unbiased estimator, computed as \f$\frac{1}{N - 1} \sum\limits_{k=1}^{N} (x_k - \bar x)^2 \f$.
-       - \c 2: Least median of squares.
-       - \c 3: Least trimmed of squares.
-    **/
-    double variance(const unsigned int variance_method=1) const {
-      double foo;
-      return variance_mean(variance_method,foo);
-    }
-
-    //! Return the variance as well as the average of the pixel values.
-    /**
-       \param variance_method Method used to estimate the variance (see variance(const unsigned int) const).
-       \param[out] mean Average pixel value.
-    **/
-    template<typename t>
-    double variance_mean(const unsigned int variance_method, t& mean) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "variance_mean(): Empty instance.",
-                                    cimg_instance);
-
-      double variance = 0, average = 0;
-      const ulongT siz = size();
-      switch (variance_method) {
-      case 0 : { // Least mean square (standard definition)
-        double S = 0, S2 = 0;
-        cimg_for(*this,ptrs,T) { const double val = (double)*ptrs; S+=val; S2+=val*val; }
-        variance = (S2 - S*S/siz)/siz;
-        average = S;
-      } break;
-      case 1 : { // Least mean square (robust definition)
-        double S = 0, S2 = 0;
-        cimg_for(*this,ptrs,T) { const double val = (double)*ptrs; S+=val; S2+=val*val; }
-        variance = siz>1?(S2 - S*S/siz)/(siz - 1):0;
-        average = S;
-      } break;
-      case 2 : { // Least Median of Squares (MAD)
-        CImg<Tfloat> buf(*this,false);
-        buf.sort();
-        const ulongT siz2 = siz>>1;
-        const double med_i = (double)buf[siz2];
-        cimg_for(buf,ptrs,Tfloat) {
-          const double val = (double)*ptrs; *ptrs = (Tfloat)cimg::abs(val - med_i); average+=val;
-        }
-        buf.sort();
-        const double sig = (double)(1.4828*buf[siz2]);
-        variance = sig*sig;
-      } break;
-      default : { // Least trimmed of Squares
-        CImg<Tfloat> buf(*this,false);
-        const ulongT siz2 = siz>>1;
-        cimg_for(buf,ptrs,Tfloat) {
-          const double val = (double)*ptrs; (*ptrs)=(Tfloat)((*ptrs)*val); average+=val;
-        }
-        buf.sort();
-        double a = 0;
-        const Tfloat *ptrs = buf._data;
-        for (ulongT j = 0; j<siz2; ++j) a+=(double)*(ptrs++);
-        const double sig = (double)(2.6477*std::sqrt(a/siz2));
-        variance = sig*sig;
-      }
-      }
-      mean = (t)(average/siz);
-      return variance>0?variance:0;
-    }
-
-    //! Return estimated variance of the noise.
-    /**
-       \param variance_method Method used to compute the variance (see variance(const unsigned int) const).
-       \note Because of structures such as edges in images it is
-       recommanded to use a robust variance estimation. The variance of the
-       noise is estimated by computing the variance of the Laplacian \f$(\Delta
-       I)^2 \f$ scaled by a factor \f$c\f$ insuring \f$ c E[(\Delta I)^2]=
-       \sigma^2\f$ where \f$\sigma\f$ is the noise variance.
-    **/
-    double variance_noise(const unsigned int variance_method=2) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "variance_noise(): Empty instance.",
-                                    cimg_instance);
-
-      const ulongT siz = size();
-      if (!siz || !_data) return 0;
-      if (variance_method>1) { // Compute a scaled version of the Laplacian.
-        CImg<Tdouble> tmp(*this);
-        if (_depth==1) {
-          const double cste = 1.0/std::sqrt(20.0); // Depends on how the Laplacian is computed.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height>=262144 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            CImg_3x3(I,T);
-            cimg_for3x3(*this,x,y,0,c,I,T) {
-              tmp(x,y,c) = cste*((double)Inc + (double)Ipc + (double)Icn +
-                                 (double)Icp - 4*(double)Icc);
-            }
-          }
-        } else {
-          const double cste = 1.0/std::sqrt(42.0); // Depends on how the Laplacian is computed.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=262144 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            CImg_3x3x3(I,T);
-            cimg_for3x3x3(*this,x,y,z,c,I,T) {
-              tmp(x,y,z,c) = cste*(
-                                   (double)Incc + (double)Ipcc + (double)Icnc + (double)Icpc +
-                                   (double)Iccn + (double)Iccp - 6*(double)Iccc);
-            }
-          }
-        }
-        return tmp.variance(variance_method);
-      }
-
-      // Version that doesn't need intermediate images.
-      double variance = 0, S = 0, S2 = 0;
-      if (_depth==1) {
-        const double cste = 1.0/std::sqrt(20.0);
-        CImg_3x3(I,T);
-        cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,T) {
-          const double val = cste*((double)Inc + (double)Ipc +
-                                   (double)Icn + (double)Icp - 4*(double)Icc);
-          S+=val; S2+=val*val;
-        }
-      } else {
-        const double cste = 1.0/std::sqrt(42.0);
-        CImg_3x3x3(I,T);
-        cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,T) {
-          const double val = cste *
-            ((double)Incc + (double)Ipcc + (double)Icnc +
-             (double)Icpc +
-             (double)Iccn + (double)Iccp - 6*(double)Iccc);
-          S+=val; S2+=val*val;
-        }
-      }
-      if (variance_method) variance = siz>1?(S2 - S*S/siz)/(siz - 1):0;
-      else variance = (S2 - S*S/siz)/siz;
-      return variance>0?variance:0;
-    }
-
-    //! Compute the MSE (Mean-Squared Error) between two images.
-    /**
-       \param img Image used as the second argument of the MSE operator.
-    **/
-    template<typename t>
-    double MSE(const CImg<t>& img) const {
-      if (img.size()!=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "MSE(): Instance and specified image (%u,%u,%u,%u,%p) have different dimensions.",
-                                    cimg_instance,
-                                    img._width,img._height,img._depth,img._spectrum,img._data);
-      double vMSE = 0;
-      const t* ptr2 = img._data;
-      cimg_for(*this,ptr1,T) {
-        const double diff = (double)*ptr1 - (double)*(ptr2++);
-        vMSE+=diff*diff;
-      }
-      const ulongT siz = img.size();
-      if (siz) vMSE/=siz;
-      return vMSE;
-    }
-
-    //! Compute the PSNR (Peak Signal-to-Noise Ratio) between two images.
-    /**
-       \param img Image used as the second argument of the PSNR operator.
-       \param max_value Maximum theoretical value of the signal.
-     **/
-    template<typename t>
-    double PSNR(const CImg<t>& img, const double max_value=255) const {
-      const double vMSE = (double)std::sqrt(MSE(img));
-      return (vMSE!=0)?(double)(20*std::log10(max_value/vMSE)):(double)(cimg::type<double>::max());
-    }
-
-    //! Evaluate math formula.
-    /**
-       \param expression Math formula, as a C-string.
-       \param x Value of the pre-defined variable \c x.
-       \param y Value of the pre-defined variable \c y.
-       \param z Value of the pre-defined variable \c z.
-       \param c Value of the pre-defined variable \c c.
-       \param list_inputs A list of input images attached to the specified math formula.
-       \param list_outputs A pointer to a list of output images attached to the specified math formula.
-    **/
-    double eval(const char *const expression,
-                const double x=0, const double y=0, const double z=0, const double c=0,
-                const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) {
-      return _eval(this,expression,x,y,z,c,list_inputs,list_outputs);
-    }
-
-    //! Evaluate math formula \const.
-    double eval(const char *const expression,
-                const double x=0, const double y=0, const double z=0, const double c=0,
-                const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) const {
-      return _eval(0,expression,x,y,z,c,list_inputs,list_outputs);
-    }
-
-    double _eval(CImg<T> *const img_output, const char *const expression,
-                 const double x, const double y, const double z, const double c,
-                 const CImgList<T> *const list_inputs, CImgList<T> *const list_outputs) const {
-      if (!expression) return 0;
-      if (!expression[1]) switch (*expression) { // Single-char optimization.
-        case 'w' : return (double)_width;
-        case 'h' : return (double)_height;
-        case 'd' : return (double)_depth;
-        case 's' : return (double)_spectrum;
-        case 'r' : return (double)_is_shared;
-        }
-      _cimg_math_parser mp(expression + (*expression=='>' || *expression=='<' ||
-                                         *expression=='*' || *expression==':'),"eval",
-                           *this,img_output,list_inputs,list_outputs,false);
-      const double val = mp(x,y,z,c);
-      mp.end();
-      return val;
-    }
-
-    //! Evaluate math formula.
-    /**
-       \param[out] output Contains values of output vector returned by the evaluated expression
-         (or is empty if the returned type is scalar).
-       \param expression Math formula, as a C-string.
-       \param x Value of the pre-defined variable \c x.
-       \param y Value of the pre-defined variable \c y.
-       \param z Value of the pre-defined variable \c z.
-       \param c Value of the pre-defined variable \c c.
-       \param list_inputs A list of input images attached to the specified math formula.
-       \param list_outputs A pointer to a list of output images attached to the specified math formula.
-    **/
-    template<typename t>
-    void eval(CImg<t> &output, const char *const expression,
-              const double x=0, const double y=0, const double z=0, const double c=0,
-              const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) {
-      _eval(output,this,expression,x,y,z,c,list_inputs,list_outputs);
-    }
-
-    //! Evaluate math formula \const.
-    template<typename t>
-    void eval(CImg<t>& output, const char *const expression,
-              const double x=0, const double y=0, const double z=0, const double c=0,
-              const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) const {
-      _eval(output,0,expression,x,y,z,c,list_inputs,list_outputs);
-    }
-
-    template<typename t>
-    void _eval(CImg<t>& output, CImg<T> *const img_output, const char *const expression,
-               const double x, const double y, const double z, const double c,
-               const CImgList<T> *const list_inputs, CImgList<T> *const list_outputs) const {
-      if (!expression) { output.assign(1); *output = 0; }
-      if (!expression[1]) switch (*expression) { // Single-char optimization.
-        case 'w' : output.assign(1); *output = (t)_width;
-        case 'h' : output.assign(1); *output = (t)_height;
-        case 'd' : output.assign(1); *output = (t)_depth;
-        case 's' : output.assign(1); *output = (t)_spectrum;
-        case 'r' : output.assign(1); *output = (t)_is_shared;
-        }
-      _cimg_math_parser mp(expression + (*expression=='>' || *expression=='<' ||
-                                         *expression=='*' || *expression==':'),"eval",
-                           *this,img_output,list_inputs,list_outputs,false);
-      output.assign(1,std::max(1U,mp.result_dim));
-      mp(x,y,z,c,output._data);
-      mp.end();
-    }
-
-    //! Evaluate math formula on a set of variables.
-    /**
-       \param expression Math formula, as a C-string.
-       \param xyzc Set of values (x,y,z,c) used for the evaluation.
-    **/
-    template<typename t>
-    CImg<doubleT> eval(const char *const expression, const CImg<t>& xyzc,
-                       const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) {
-      return _eval(this,expression,xyzc,list_inputs,list_outputs);
-    }
-
-    //! Evaluate math formula on a set of variables \const.
-    template<typename t>
-    CImg<doubleT> eval(const char *const expression, const CImg<t>& xyzc,
-                       const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) const {
-      return _eval(0,expression,xyzc,list_inputs,list_outputs);
-    }
-
-    template<typename t>
-    CImg<doubleT> _eval(CImg<T> *const output, const char *const expression, const CImg<t>& xyzc,
-                        const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) const {
-      CImg<doubleT> res(1,xyzc.size()/4);
-      if (!expression) return res.fill(0);
-      _cimg_math_parser mp(expression,"eval",*this,output,list_inputs,list_outputs,false);
-#ifdef cimg_use_openmp
-      cimg_pragma_openmp(parallel if (res._height>=512))
-      {
-        _cimg_math_parser
-          _mp = omp_get_thread_num()?mp:_cimg_math_parser(),
-          &lmp = omp_get_thread_num()?_mp:mp;
-        cimg_pragma_openmp(for)
-          for (unsigned int i = 0; i<res._height; ++i) {
-            const unsigned int i4 = 4*i;
-            const double
-              x = (double)xyzc[i4], y = (double)xyzc[i4 + 1],
-              z = (double)xyzc[i4 + 2], c = (double)xyzc[i4 + 3];
-            res[i] = lmp(x,y,z,c);
-          }
-        }
-#else
-      const t *ps = xyzc._data;
-      cimg_for(res,pd,double) {
-        const double x = (double)*(ps++), y = (double)*(ps++), z = (double)*(ps++), c = (double)*(ps++);
-        *pd = mp(x,y,z,c);
-      }
-#endif
-      mp.end();
-      return res;
-    }
-
-    //! Compute statistics vector from the pixel values.
-    /*
-       \param variance_method Method used to compute the variance (see variance(const unsigned int) const).
-       \return Statistics vector as
-         <tt>[min; max; mean; variance; xmin; ymin; zmin; cmin; xmax; ymax; zmax; cmax; sum; product]</tt>.
-    **/
-    CImg<Tdouble> get_stats(const unsigned int variance_method=1) const {
-      if (is_empty()) return CImg<doubleT>();
-      const ulongT siz = size();
-      const T *const odata = _data;
-      const T *pm = odata, *pM = odata;
-      double S = 0, S2 = 0, P = _data?1:0;
-      T m = *pm, M = m;
-      cimg_for(*this,ptrs,T) {
-        const T val = *ptrs;
-        const double _val = (double)val;
-        if (val<m) { m = val; pm = ptrs; }
-        if (val>M) { M = val; pM = ptrs; }
-        S+=_val;
-        S2+=_val*_val;
-        P*=_val;
-      }
-      const double
-        mean_value = S/siz,
-        _variance_value = variance_method==0?(S2 - S*S/siz)/siz:
-        (variance_method==1?(siz>1?(S2 - S*S/siz)/(siz - 1):0):
-         variance(variance_method)),
-        variance_value = _variance_value>0?_variance_value:0;
-      int
-        xm = 0, ym = 0, zm = 0, cm = 0,
-        xM = 0, yM = 0, zM = 0, cM = 0;
-      contains(*pm,xm,ym,zm,cm);
-      contains(*pM,xM,yM,zM,cM);
-      return CImg<Tdouble>(1,14).fill((double)m,(double)M,mean_value,variance_value,
-                                      (double)xm,(double)ym,(double)zm,(double)cm,
-                                      (double)xM,(double)yM,(double)zM,(double)cM,
-                                      S,P);
-    }
-
-    //! Compute statistics vector from the pixel values \inplace.
-    CImg<T>& stats(const unsigned int variance_method=1) {
-      return get_stats(variance_method).move_to(*this);
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Vector / Matrix Operations
-    //@{
-    //-------------------------------------
-
-    //! Compute norm of the image, viewed as a matrix.
-    /**
-       \param magnitude_type Norm type. Can be:
-       - \c -1: Linf-norm
-       - \c 0: L2-norm
-       - \c 1: L1-norm
-    **/
-    double magnitude(const int magnitude_type=2) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "magnitude(): Empty instance.",
-                                    cimg_instance);
-      double res = 0;
-      switch (magnitude_type) {
-      case -1 : {
-        cimg_for(*this,ptrs,T) { const double val = (double)cimg::abs(*ptrs); if (val>res) res = val; }
-      } break;
-      case 1 : {
-        cimg_for(*this,ptrs,T) res+=(double)cimg::abs(*ptrs);
-      } break;
-      default : {
-        cimg_for(*this,ptrs,T) res+=(double)cimg::sqr(*ptrs);
-        res = (double)std::sqrt(res);
-      }
-      }
-      return res;
-    }
-
-    //! Compute the trace of the image, viewed as a matrix.
-    /**
-     **/
-    double trace() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "trace(): Empty instance.",
-                                    cimg_instance);
-      double res = 0;
-      cimg_forX(*this,k) res+=(double)(*this)(k,k);
-      return res;
-    }
-
-    //! Compute the determinant of the image, viewed as a matrix.
-    /**
-     **/
-    double det() const {
-      if (is_empty() || _width!=_height || _depth!=1 || _spectrum!=1)
-        throw CImgInstanceException(_cimg_instance
-                                    "det(): Instance is not a square matrix.",
-                                    cimg_instance);
-
-      switch (_width) {
-      case 1 : return (double)((*this)(0,0));
-      case 2 : return (double)((*this)(0,0))*(double)((*this)(1,1)) - (double)((*this)(0,1))*(double)((*this)(1,0));
-      case 3 : {
-        const double
-          a = (double)_data[0], d = (double)_data[1], g = (double)_data[2],
-          b = (double)_data[3], e = (double)_data[4], h = (double)_data[5],
-          c = (double)_data[6], f = (double)_data[7], i = (double)_data[8];
-        return i*a*e - a*h*f - i*b*d + b*g*f + c*d*h - c*g*e;
-      }
-      default : {
-        CImg<Tfloat> lu(*this);
-        CImg<uintT> indx;
-        bool d;
-        lu._LU(indx,d);
-        double res = d?(double)1:(double)-1;
-        cimg_forX(lu,i) res*=lu(i,i);
-        return res;
-      }
-      }
-    }
-
-    //! Compute the dot product between instance and argument, viewed as matrices.
-    /**
-       \param img Image used as a second argument of the dot product.
-    **/
-    template<typename t>
-    double dot(const CImg<t>& img) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "dot(): Empty instance.",
-                                    cimg_instance);
-      if (!img)
-        throw CImgArgumentException(_cimg_instance
-                                    "dot(): Empty specified image.",
-                                    cimg_instance);
-
-      const ulongT nb = std::min(size(),img.size());
-      double res = 0;
-      for (ulongT off = 0; off<nb; ++off) res+=(double)_data[off]*(double)img[off];
-      return res;
-    }
-
-    //! Get vector-valued pixel located at specified position.
-    /**
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-    **/
-    CImg<T> get_vector_at(const unsigned int x, const unsigned int y=0, const unsigned int z=0) const {
-      CImg<T> res;
-      if (res._height!=_spectrum) res.assign(1,_spectrum);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      const T *ptrs = data(x,y,z);
-      T *ptrd = res._data;
-      cimg_forC(*this,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-      return res;
-    }
-
-    //! Get (square) matrix-valued pixel located at specified position.
-    /**
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \note - The spectrum() of the image must be a square.
-     **/
-    CImg<T> get_matrix_at(const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) const {
-      const int n = (int)std::sqrt((double)_spectrum);
-      const T *ptrs = data(x,y,z,0);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      CImg<T> res(n,n);
-      T *ptrd = res._data;
-      cimg_forC(*this,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
-      return res;
-    }
-
-    //! Get tensor-valued pixel located at specified position.
-    /**
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-    **/
-    CImg<T> get_tensor_at(const unsigned int x, const unsigned int y=0, const unsigned int z=0) const {
-      const T *ptrs = data(x,y,z,0);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      if (_spectrum==6)
-        return tensor(*ptrs,*(ptrs + whd),*(ptrs + 2*whd),*(ptrs + 3*whd),*(ptrs + 4*whd),*(ptrs + 5*whd));
-      if (_spectrum==3)
-        return tensor(*ptrs,*(ptrs + whd),*(ptrs + 2*whd));
-      return tensor(*ptrs);
-    }
-
-    //! Set vector-valued pixel at specified position.
-    /**
-       \param vec Vector to put on the instance image.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-    **/
-    template<typename t>
-    CImg<T>& set_vector_at(const CImg<t>& vec, const unsigned int x, const unsigned int y=0, const unsigned int z=0) {
-      if (x<_width && y<_height && z<_depth) {
-        const t *ptrs = vec._data;
-        const ulongT whd = (ulongT)_width*_height*_depth;
-        T *ptrd = data(x,y,z);
-        for (unsigned int k = std::min((unsigned int)vec.size(),_spectrum); k; --k) {
-          *ptrd = (T)*(ptrs++); ptrd+=whd;
-        }
-      }
-      return *this;
-    }
-
-    //! Set (square) matrix-valued pixel at specified position.
-    /**
-       \param mat Matrix to put on the instance image.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-    **/
-    template<typename t>
-    CImg<T>& set_matrix_at(const CImg<t>& mat, const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) {
-      return set_vector_at(mat,x,y,z);
-    }
-
-    //! Set tensor-valued pixel at specified position.
-    /**
-       \param ten Tensor to put on the instance image.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-    **/
-    template<typename t>
-    CImg<T>& set_tensor_at(const CImg<t>& ten, const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) {
-      T *ptrd = data(x,y,z,0);
-      const ulongT siz = (ulongT)_width*_height*_depth;
-      if (ten._height==2) {
-        *ptrd = (T)ten[0]; ptrd+=siz;
-        *ptrd = (T)ten[1]; ptrd+=siz;
-        *ptrd = (T)ten[3];
-      }
-      else {
-        *ptrd = (T)ten[0]; ptrd+=siz;
-        *ptrd = (T)ten[1]; ptrd+=siz;
-        *ptrd = (T)ten[2]; ptrd+=siz;
-        *ptrd = (T)ten[4]; ptrd+=siz;
-        *ptrd = (T)ten[5]; ptrd+=siz;
-        *ptrd = (T)ten[8];
-      }
-      return *this;
-    }
-
-    //! Unroll pixel values along axis \c y.
-    /**
-       \note Equivalent to \code unroll('y'); \endcode.
-    **/
-    CImg<T>& vector() {
-      return unroll('y');
-    }
-
-    //! Unroll pixel values along axis \c y \newinstance.
-    CImg<T> get_vector() const {
-      return get_unroll('y');
-    }
-
-    //! Resize image to become a scalar square matrix.
-    /**
-     **/
-    CImg<T>& matrix() {
-      const ulongT siz = size();
-      switch (siz) {
-      case 1 : break;
-      case 4 : _width = _height = 2; break;
-      case 9 : _width = _height = 3; break;
-      case 16 : _width = _height = 4; break;
-      case 25 : _width = _height = 5; break;
-      case 36 : _width = _height = 6; break;
-      case 49 : _width = _height = 7; break;
-      case 64 : _width = _height = 8; break;
-      case 81 : _width = _height = 9; break;
-      case 100 : _width = _height = 10; break;
-      default : {
-        ulongT i = 11, i2 = i*i;
-        while (i2<siz) { i2+=2*i + 1; ++i; }
-        if (i2==siz) _width = _height = i;
-        else throw CImgInstanceException(_cimg_instance
-                                         "matrix(): Invalid instance size %u (should be a square integer).",
-                                         cimg_instance,
-                                         siz);
-      }
-      }
-      return *this;
-    }
-
-    //! Resize image to become a scalar square matrix \newinstance.
-    CImg<T> get_matrix() const {
-      return (+*this).matrix();
-    }
-
-    //! Resize image to become a symmetric tensor.
-    /**
-     **/
-    CImg<T>& tensor() {
-      return get_tensor().move_to(*this);
-    }
-
-    //! Resize image to become a symmetric tensor \newinstance.
-    CImg<T> get_tensor() const {
-      CImg<T> res;
-      const ulongT siz = size();
-      switch (siz) {
-      case 1 : break;
-      case 3 :
-        res.assign(2,2);
-        res(0,0) = (*this)(0);
-        res(1,0) = res(0,1) = (*this)(1);
-        res(1,1) = (*this)(2);
-        break;
-      case 6 :
-        res.assign(3,3);
-        res(0,0) = (*this)(0);
-        res(1,0) = res(0,1) = (*this)(1);
-        res(2,0) = res(0,2) = (*this)(2);
-        res(1,1) = (*this)(3);
-        res(2,1) = res(1,2) = (*this)(4);
-        res(2,2) = (*this)(5);
-        break;
-      default :
-        throw CImgInstanceException(_cimg_instance
-                                    "tensor(): Invalid instance size (does not define a 1x1, 2x2 or 3x3 tensor).",
-                                    cimg_instance);
-      }
-      return res;
-    }
-
-    //! Resize image to become a diagonal matrix.
-    /**
-       \note Transform the image as a diagonal matrix so that each of its initial value becomes a diagonal coefficient.
-    **/
-    CImg<T>& diagonal() {
-      return get_diagonal().move_to(*this);
-    }
-
-    //! Resize image to become a diagonal matrix \newinstance.
-    CImg<T> get_diagonal() const {
-      if (is_empty()) return *this;
-      const unsigned int siz = (unsigned int)size();
-      CImg<T> res(siz,siz,1,1,0);
-      cimg_foroff(*this,off) res((unsigned int)off,(unsigned int)off) = (*this)[off];
-      return res;
-    }
-
-    //! Replace the image by an identity matrix.
-    /**
-       \note If the instance image is not square, it is resized to a square matrix using its maximum
-       dimension as a reference.
-    **/
-    CImg<T>& identity_matrix() {
-      return identity_matrix(std::max(_width,_height)).move_to(*this);
-    }
-
-    //! Replace the image by an identity matrix \newinstance.
-    CImg<T> get_identity_matrix() const {
-      return identity_matrix(std::max(_width,_height));
-    }
-
-    //! Fill image with a linear sequence of values.
-    /**
-       \param a0 Starting value of the sequence.
-       \param a1 Ending value of the sequence.
-    **/
-    CImg<T>& sequence(const T& a0, const T& a1) {
-      if (is_empty()) return *this;
-      const ulongT siz = size() - 1;
-      T* ptr = _data;
-      if (siz) {
-        const double delta = (double)a1 - (double)a0;
-        cimg_foroff(*this,l) *(ptr++) = (T)(a0 + delta*l/siz);
-      } else *ptr = a0;
-      return *this;
-    }
-
-    //! Fill image with a linear sequence of values \newinstance.
-    CImg<T> get_sequence(const T& a0, const T& a1) const {
-      return (+*this).sequence(a0,a1);
-    }
-
-    //! Transpose the image, viewed as a matrix.
-    /**
-       \note Equivalent to \code permute_axes("yxzc"); \endcode
-    **/
-    CImg<T>& transpose() {
-      if (_width==1) { _width = _height; _height = 1; return *this; }
-      if (_height==1) { _height = _width; _width = 1; return *this; }
-      if (_width==_height) {
-        cimg_forYZC(*this,y,z,c) for (int x = y; x<width(); ++x) cimg::swap((*this)(x,y,z,c),(*this)(y,x,z,c));
-        return *this;
-      }
-      return get_transpose().move_to(*this);
-    }
-
-    //! Transpose the image, viewed as a matrix \newinstance.
-    CImg<T> get_transpose() const {
-      return get_permute_axes("yxzc");
-    }
-
-    //! Compute the cross product between two \c 1x3 images, viewed as 3d vectors.
-    /**
-       \param img Image used as the second argument of the cross product.
-       \note The first argument of the cross product is \c *this.
-     **/
-    template<typename t>
-    CImg<T>& cross(const CImg<t>& img) {
-      if (_width!=1 || _height<3 || img._width!=1 || img._height<3)
-        throw CImgInstanceException(_cimg_instance
-                                    "cross(): Instance and/or specified image (%u,%u,%u,%u,%p) are not 3d vectors.",
-                                    cimg_instance,
-                                    img._width,img._height,img._depth,img._spectrum,img._data);
-
-      const T x = (*this)[0], y = (*this)[1], z = (*this)[2];
-      (*this)[0] = (T)(y*img[2] - z*img[1]);
-      (*this)[1] = (T)(z*img[0] - x*img[2]);
-      (*this)[2] = (T)(x*img[1] - y*img[0]);
-      return *this;
-    }
-
-    //! Compute the cross product between two \c 1x3 images, viewed as 3d vectors \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_cross(const CImg<t>& img) const {
-      return CImg<_cimg_Tt>(*this).cross(img);
-    }
-
-    //! Invert the instance image, viewed as a matrix.
-    /**
-       \param use_LU Choose the inverting algorithm. Can be:
-       - \c true: LU-based matrix inversion.
-       - \c false: SVD-based matrix inversion.
-    **/
-    CImg<T>& invert(const bool use_LU=true) {
-      if (_width!=_height || _depth!=1 || _spectrum!=1)
-        throw CImgInstanceException(_cimg_instance
-                                    "invert(): Instance is not a square matrix.",
-                                    cimg_instance);
-#ifdef cimg_use_lapack
-      int INFO = (int)use_LU, N = _width, LWORK = 4*N, *const IPIV = new int[N];
-      Tfloat
-        *const lapA = new Tfloat[N*N],
-        *const WORK = new Tfloat[LWORK];
-      cimg_forXY(*this,k,l) lapA[k*N + l] = (Tfloat)((*this)(k,l));
-      cimg::getrf(N,lapA,IPIV,INFO);
-      if (INFO)
-        cimg::warn(_cimg_instance
-                   "invert(): LAPACK function dgetrf_() returned error code %d.",
-                   cimg_instance,
-                   INFO);
-      else {
-        cimg::getri(N,lapA,IPIV,WORK,LWORK,INFO);
-        if (INFO)
-          cimg::warn(_cimg_instance
-                     "invert(): LAPACK function dgetri_() returned error code %d.",
-                     cimg_instance,
-                     INFO);
-      }
-      if (!INFO) cimg_forXY(*this,k,l) (*this)(k,l) = (T)(lapA[k*N + l]); else fill(0);
-      delete[] IPIV; delete[] lapA; delete[] WORK;
-#else
-      const double dete = _width>3?-1.0:det();
-      if (dete!=0.0 && _width==2) {
-        const double
-          a = _data[0], c = _data[1],
-          b = _data[2], d = _data[3];
-        _data[0] = (T)(d/dete); _data[1] = (T)(-c/dete);
-        _data[2] = (T)(-b/dete); _data[3] = (T)(a/dete);
-      } else if (dete!=0.0 && _width==3) {
-        const double
-          a = _data[0], d = _data[1], g = _data[2],
-          b = _data[3], e = _data[4], h = _data[5],
-          c = _data[6], f = _data[7], i = _data[8];
-        _data[0] = (T)((i*e-f*h)/dete), _data[1] = (T)((g*f-i*d)/dete), _data[2] = (T)((d*h-g*e)/dete);
-        _data[3] = (T)((h*c-i*b)/dete), _data[4] = (T)((i*a-c*g)/dete), _data[5] = (T)((g*b-a*h)/dete);
-        _data[6] = (T)((b*f-e*c)/dete), _data[7] = (T)((d*c-a*f)/dete), _data[8] = (T)((a*e-d*b)/dete);
-      } else {
-        if (use_LU) { // LU-based inverse computation
-          CImg<Tfloat> A(*this), indx, col(1,_width);
-          bool d;
-          A._LU(indx,d);
-          cimg_forX(*this,j) {
-            col.fill(0);
-            col(j) = 1;
-            col._solve(A,indx);
-            cimg_forX(*this,i) (*this)(j,i) = (T)col(i);
-          }
-        } else { // SVD-based inverse computation
-          CImg<Tfloat> U(_width,_width), S(1,_width), V(_width,_width);
-          SVD(U,S,V,false);
-          U.transpose();
-          cimg_forY(S,k) if (S[k]!=0) S[k]=1/S[k];
-          S.diagonal();
-          *this = V*S*U;
-        }
-      }
-#endif
-      return *this;
-    }
-
-    //! Invert the instance image, viewed as a matrix \newinstance.
-    CImg<Tfloat> get_invert(const bool use_LU=true) const {
-      return CImg<Tfloat>(*this,false).invert(use_LU);
-    }
-
-    //! Compute the Moore-Penrose pseudo-inverse of the instance image, viewed as a matrix.
-    /**
-    **/
-    CImg<T>& pseudoinvert() {
-      return get_pseudoinvert().move_to(*this);
-    }
-
-    //! Compute the Moore-Penrose pseudo-inverse of the instance image, viewed as a matrix \newinstance.
-    CImg<Tfloat> get_pseudoinvert() const {
-      CImg<Tfloat> U, S, V;
-      SVD(U,S,V);
-      const Tfloat tolerance = (sizeof(Tfloat)<=4?5.96e-8f:1.11e-16f)*std::max(_width,_height)*S.max();
-      cimg_forX(V,x) {
-        const Tfloat s = S(x), invs = s>tolerance?1/s:0;
-        cimg_forY(V,y) V(x,y)*=invs;
-      }
-      return V*U.transpose();
-    }
-
-    //! Solve a system of linear equations.
-    /**
-       \param A Matrix of the linear system.
-       \note Solve \c AX=B where \c B=*this.
-    **/
-    template<typename t>
-    CImg<T>& solve(const CImg<t>& A) {
-      if (_depth!=1 || _spectrum!=1 || _height!=A._height || A._depth!=1 || A._spectrum!=1)
-        throw CImgArgumentException(_cimg_instance
-                                    "solve(): Instance and specified matrix (%u,%u,%u,%u,%p) have "
-                                    "incompatible dimensions.",
-                                    cimg_instance,
-                                    A._width,A._height,A._depth,A._spectrum,A._data);
-      typedef _cimg_Ttfloat Ttfloat;
-      if (A._width==A._height) { // Classical linear system
-        if (_width!=1) {
-          CImg<T> res(_width,A._width);
-          cimg_forX(*this,i) res.draw_image(i,get_column(i).solve(A));
-          return res.move_to(*this);
-        }
-#ifdef cimg_use_lapack
-        char TRANS = 'N';
-        int INFO, N = _height, LWORK = 4*N, *const IPIV = new int[N];
-        Ttfloat
-          *const lapA = new Ttfloat[N*N],
-          *const lapB = new Ttfloat[N],
-          *const WORK = new Ttfloat[LWORK];
-        cimg_forXY(A,k,l) lapA[k*N + l] = (Ttfloat)(A(k,l));
-        cimg_forY(*this,i) lapB[i] = (Ttfloat)((*this)(i));
-        cimg::getrf(N,lapA,IPIV,INFO);
-        if (INFO)
-          cimg::warn(_cimg_instance
-                     "solve(): LAPACK library function dgetrf_() returned error code %d.",
-                     cimg_instance,
-                     INFO);
-
-        if (!INFO) {
-          cimg::getrs(TRANS,N,lapA,IPIV,lapB,INFO);
-          if (INFO)
-            cimg::warn(_cimg_instance
-                       "solve(): LAPACK library function dgetrs_() returned error code %d.",
-                       cimg_instance,
-                       INFO);
-        }
-        if (!INFO) cimg_forY(*this,i) (*this)(i) = (T)(lapB[i]); else fill(0);
-        delete[] IPIV; delete[] lapA; delete[] lapB; delete[] WORK;
-#else
-        CImg<Ttfloat> lu(A,false);
-        CImg<Ttfloat> indx;
-        bool d;
-        lu._LU(indx,d);
-        _solve(lu,indx);
-#endif
-      } else { // Least-square solution for non-square systems.
-#ifdef cimg_use_lapack
-        if (_width!=1) {
-          CImg<T> res(_width,A._width);
-          cimg_forX(*this,i) res.draw_image(i,get_column(i).solve(A));
-          return res.move_to(*this);
-        }
-        char TRANS = 'N';
-        int INFO, N = A._width, M = A._height, LWORK = -1, LDA = M, LDB = M, NRHS = _width;
-        Ttfloat WORK_QUERY;
-        Ttfloat
-          * const lapA = new Ttfloat[M*N],
-          * const lapB = new Ttfloat[M*NRHS];
-        cimg::sgels(TRANS, M, N, NRHS, lapA, LDA, lapB, LDB, &WORK_QUERY, LWORK, INFO);
-        LWORK = (int) WORK_QUERY;
-        Ttfloat *const WORK = new Ttfloat[LWORK];
-        cimg_forXY(A,k,l) lapA[k*M + l] = (Ttfloat)(A(k,l));
-        cimg_forXY(*this,k,l) lapB[k*M + l] = (Ttfloat)((*this)(k,l));
-        cimg::sgels(TRANS, M, N, NRHS, lapA, LDA, lapB, LDB, WORK, LWORK, INFO);
-        if (INFO != 0)
-          cimg::warn(_cimg_instance
-                     "solve(): LAPACK library function sgels() returned error code %d.",
-                     cimg_instance,
-                     INFO);
-        assign(NRHS, N);
-        if (!INFO)
-          cimg_forXY(*this,k,l) (*this)(k,l) = (T)lapB[k*M + l];
-        else
-          assign(A.get_pseudoinvert()*(*this));
-        delete[] lapA; delete[] lapB; delete[] WORK;
-#else
-        assign(A.get_pseudoinvert()*(*this));
-#endif
-      }
-      return *this;
-    }
-
-    //! Solve a system of linear equations \newinstance.
-    template<typename t>
-    CImg<_cimg_Ttfloat> get_solve(const CImg<t>& A) const {
-      return CImg<_cimg_Ttfloat>(*this,false).solve(A);
-    }
-
-    template<typename t, typename ti>
-    CImg<T>& _solve(const CImg<t>& A, const CImg<ti>& indx) {
-      typedef _cimg_Ttfloat Ttfloat;
-      const int N = (int)size();
-      int ii = -1;
-      Ttfloat sum;
-      for (int i = 0; i<N; ++i) {
-        const int ip = (int)indx[i];
-        Ttfloat sum = (*this)(ip);
-        (*this)(ip) = (*this)(i);
-        if (ii>=0) for (int j = ii; j<=i - 1; ++j) sum-=A(j,i)*(*this)(j);
-        else if (sum!=0) ii = i;
-        (*this)(i) = (T)sum;
-      }
-      for (int i = N - 1; i>=0; --i) {
-        sum = (*this)(i);
-        for (int j = i + 1; j<N; ++j) sum-=A(j,i)*(*this)(j);
-        (*this)(i) = (T)(sum/A(i,i));
-      }
-      return *this;
-    }
-
-    //! Solve a tridiagonal system of linear equations.
-    /**
-       \param A Coefficients of the tridiagonal system.
-       A is a tridiagonal matrix A = [ b0,c0,0,...; a1,b1,c1,0,... ; ... ; ...,0,aN,bN ],
-       stored as a 3 columns matrix
-       \note Solve AX=B where \c B=*this, using the Thomas algorithm.
-    **/
-    template<typename t>
-    CImg<T>& solve_tridiagonal(const CImg<t>& A) {
-      const unsigned int siz = (unsigned int)size();
-      if (A._width!=3 || A._height!=siz)
-        throw CImgArgumentException(_cimg_instance
-                                    "solve_tridiagonal(): Instance and tridiagonal matrix "
-                                    "(%u,%u,%u,%u,%p) have incompatible dimensions.",
-                                    cimg_instance,
-                                    A._width,A._height,A._depth,A._spectrum,A._data);
-      typedef _cimg_Ttfloat Ttfloat;
-      const Ttfloat epsilon = 1e-4f;
-      CImg<Ttfloat> B = A.get_column(1), V(*this,false);
-      for (int i = 1; i<(int)siz; ++i) {
-        const Ttfloat m = A(0,i)/(B[i - 1]?B[i - 1]:epsilon);
-        B[i] -= m*A(2,i - 1);
-        V[i] -= m*V[i - 1];
-      }
-      (*this)[siz - 1] = (T)(V[siz - 1]/(B[siz - 1]?B[siz - 1]:epsilon));
-      for (int i = (int)siz - 2; i>=0; --i) (*this)[i] = (T)((V[i] - A(2,i)*(*this)[i + 1])/(B[i]?B[i]:epsilon));
-      return *this;
-    }
-
-    //! Solve a tridiagonal system of linear equations \newinstance.
-    template<typename t>
-    CImg<_cimg_Ttfloat> get_solve_tridiagonal(const CImg<t>& A) const {
-      return CImg<_cimg_Ttfloat>(*this,false).solve_tridiagonal(A);
-    }
-
-    //! Compute eigenvalues and eigenvectors of the instance image, viewed as a matrix.
-    /**
-       \param[out] val Vector of the estimated eigenvalues, in decreasing order.
-       \param[out] vec Matrix of the estimated eigenvectors, sorted by columns.
-    **/
-    template<typename t>
-    const CImg<T>& eigen(CImg<t>& val, CImg<t> &vec) const {
-      if (is_empty()) { val.assign(); vec.assign(); }
-      else {
-        if (_width!=_height || _depth>1 || _spectrum>1)
-          throw CImgInstanceException(_cimg_instance
-                                      "eigen(): Instance is not a square matrix.",
-                                      cimg_instance);
-
-        if (val.size()<(ulongT)_width) val.assign(1,_width);
-        if (vec.size()<(ulongT)_width*_width) vec.assign(_width,_width);
-        switch (_width) {
-        case 1 : { val[0] = (t)(*this)[0]; vec[0] = (t)1; } break;
-        case 2 : {
-          const double a = (*this)[0], b = (*this)[1], c = (*this)[2], d = (*this)[3], e = a + d;
-          double f = e*e - 4*(a*d - b*c);
-          if (f<0)
-            cimg::warn(_cimg_instance
-                       "eigen(): Complex eigenvalues found.",
-                       cimg_instance);
-
-          f = std::sqrt(f);
-          const double
-            l1 = 0.5*(e - f),
-            l2 = 0.5*(e + f),
-            b2 = b*b,
-            norm1 = std::sqrt(cimg::sqr(l2 - a) + b2),
-            norm2 = std::sqrt(cimg::sqr(l1 - a) + b2);
-          val[0] = (t)l2;
-          val[1] = (t)l1;
-          if (norm1>0) { vec(0,0) = (t)(b/norm1); vec(0,1) = (t)((l2 - a)/norm1); } else { vec(0,0) = 1; vec(0,1) = 0; }
-          if (norm2>0) { vec(1,0) = (t)(b/norm2); vec(1,1) = (t)((l1 - a)/norm2); } else { vec(1,0) = 1; vec(1,1) = 0; }
-        } break;
-        default :
-          throw CImgInstanceException(_cimg_instance
-                                      "eigen(): Eigenvalues computation of general matrices is limited "
-                                      "to 2x2 matrices.",
-                                      cimg_instance);
-        }
-      }
-      return *this;
-    }
-
-    //! Compute eigenvalues and eigenvectors of the instance image, viewed as a matrix.
-    /**
-       \return A list of two images <tt>[val; vec]</tt>, whose meaning is similar as in eigen(CImg<t>&,CImg<t>&) const.
-    **/
-    CImgList<Tfloat> get_eigen() const {
-      CImgList<Tfloat> res(2);
-      eigen(res[0],res[1]);
-      return res;
-    }
-
-    //! Compute eigenvalues and eigenvectors of the instance image, viewed as a symmetric matrix.
-    /**
-       \param[out] val Vector of the estimated eigenvalues, in decreasing order.
-       \param[out] vec Matrix of the estimated eigenvectors, sorted by columns.
-    **/
-    template<typename t>
-    const CImg<T>& symmetric_eigen(CImg<t>& val, CImg<t>& vec) const {
-      if (is_empty()) { val.assign(); vec.assign(); }
-      else {
-#ifdef cimg_use_lapack
-        char JOB = 'V', UPLO = 'U';
-        int N = _width, LWORK = 4*N, INFO;
-        Tfloat
-          *const lapA = new Tfloat[N*N],
-          *const lapW = new Tfloat[N],
-          *const WORK = new Tfloat[LWORK];
-        cimg_forXY(*this,k,l) lapA[k*N + l] = (Tfloat)((*this)(k,l));
-        cimg::syev(JOB,UPLO,N,lapA,lapW,WORK,LWORK,INFO);
-        if (INFO)
-          cimg::warn(_cimg_instance
-                     "symmetric_eigen(): LAPACK library function dsyev_() returned error code %d.",
-                     cimg_instance,
-                     INFO);
-
-        val.assign(1,N);
-        vec.assign(N,N);
-        if (!INFO) {
-          cimg_forY(val,i) val(i) = (T)lapW[N - 1 -i];
-          cimg_forXY(vec,k,l) vec(k,l) = (T)(lapA[(N - 1 - k)*N + l]);
-        } else { val.fill(0); vec.fill(0); }
-        delete[] lapA; delete[] lapW; delete[] WORK;
-#else
-        if (_width!=_height || _depth>1 || _spectrum>1)
-          throw CImgInstanceException(_cimg_instance
-                                      "eigen(): Instance is not a square matrix.",
-                                      cimg_instance);
-
-        val.assign(1,_width);
-        if (vec._data) vec.assign(_width,_width);
-        if (_width<3) {
-          eigen(val,vec);
-          if (_width==2) { vec[1] = -vec[2]; vec[3] = vec[0]; } // Force orthogonality for 2x2 matrices.
-          return *this;
-        }
-        CImg<t> V(_width,_width);
-        Tfloat M = 0, m = (Tfloat)min_max(M), maxabs = cimg::max((Tfloat)1.0f,cimg::abs(m),cimg::abs(M));
-        (CImg<Tfloat>(*this,false)/=maxabs).SVD(vec,val,V,false);
-        if (maxabs!=1) val*=maxabs;
-
-        bool is_ambiguous = false;
-        float eig = 0;
-        cimg_forY(val,p) {       // check for ambiguous cases.
-          if (val[p]>eig) eig = (float)val[p];
-          t scal = 0;
-          cimg_forY(vec,y) scal+=vec(p,y)*V(p,y);
-          if (cimg::abs(scal)<0.9f) is_ambiguous = true;
-          if (scal<0) val[p] = -val[p];
-        }
-        if (is_ambiguous) {
-          ++(eig*=2);
-          SVD(vec,val,V,false,40,eig);
-          val-=eig;
-        }
-        CImg<intT> permutations;  // sort eigenvalues in decreasing order
-        CImg<t> tmp(_width);
-        val.sort(permutations,false);
-        cimg_forY(vec,k) {
-          cimg_forY(permutations,y) tmp(y) = vec(permutations(y),k);
-          std::memcpy(vec.data(0,k),tmp._data,sizeof(t)*_width);
-        }
-#endif
-      }
-      return *this;
-    }
-
-    //! Compute eigenvalues and eigenvectors of the instance image, viewed as a symmetric matrix.
-    /**
-       \return A list of two images <tt>[val; vec]</tt>, whose meaning are similar as in
-         symmetric_eigen(CImg<t>&,CImg<t>&) const.
-    **/
-    CImgList<Tfloat> get_symmetric_eigen() const {
-      CImgList<Tfloat> res(2);
-      symmetric_eigen(res[0],res[1]);
-      return res;
-    }
-
-    //! Sort pixel values and get sorting permutations.
-    /**
-       \param[out] permutations Permutation map used for the sorting.
-       \param is_increasing Tells if pixel values are sorted in an increasing (\c true) or decreasing (\c false) way.
-    **/
-    template<typename t>
-    CImg<T>& sort(CImg<t>& permutations, const bool is_increasing=true) {
-      permutations.assign(_width,_height,_depth,_spectrum);
-      if (is_empty()) return *this;
-      cimg_foroff(permutations,off) permutations[off] = (t)off;
-      return _quicksort(0,size() - 1,permutations,is_increasing,true);
-    }
-
-    //! Sort pixel values and get sorting permutations \newinstance.
-    template<typename t>
-    CImg<T> get_sort(CImg<t>& permutations, const bool is_increasing=true) const {
-      return (+*this).sort(permutations,is_increasing);
-    }
-
-    //! Sort pixel values.
-    /**
-       \param is_increasing Tells if pixel values are sorted in an increasing (\c true) or decreasing (\c false) way.
-       \param axis Tells if the value sorting must be done along a specific axis. Can be:
-       - \c 0: All pixel values are sorted, independently on their initial position.
-       - \c 'x': Image columns are sorted, according to the first value in each column.
-       - \c 'y': Image rows are sorted, according to the first value in each row.
-       - \c 'z': Image slices are sorted, according to the first value in each slice.
-       - \c 'c': Image channels are sorted, according to the first value in each channel.
-    **/
-    CImg<T>& sort(const bool is_increasing=true, const char axis=0) {
-      if (is_empty()) return *this;
-      CImg<uintT> perm;
-      switch (cimg::lowercase(axis)) {
-      case 0 :
-        _quicksort(0,size() - 1,perm,is_increasing,false);
-        break;
-      case 'x' : {
-        perm.assign(_width);
-        get_crop(0,0,0,0,_width - 1,0,0,0).sort(perm,is_increasing);
-        CImg<T> img(*this,false);
-        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(perm[x],y,z,c);
-      } break;
-      case 'y' : {
-        perm.assign(_height);
-        get_crop(0,0,0,0,0,_height - 1,0,0).sort(perm,is_increasing);
-        CImg<T> img(*this,false);
-        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,perm[y],z,c);
-      } break;
-      case 'z' : {
-        perm.assign(_depth);
-        get_crop(0,0,0,0,0,0,_depth - 1,0).sort(perm,is_increasing);
-        CImg<T> img(*this,false);
-        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,y,perm[z],c);
-      } break;
-      case 'c' : {
-        perm.assign(_spectrum);
-        get_crop(0,0,0,0,0,0,0,_spectrum - 1).sort(perm,is_increasing);
-        CImg<T> img(*this,false);
-        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,y,z,perm[c]);
-      } break;
-      default :
-        throw CImgArgumentException(_cimg_instance
-                                    "sort(): Invalid specified axis '%c' "
-                                    "(should be { x | y | z | c }).",
-                                    cimg_instance,axis);
-      }
-      return *this;
-    }
-
-    //! Sort pixel values \newinstance.
-    CImg<T> get_sort(const bool is_increasing=true, const char axis=0) const {
-      return (+*this).sort(is_increasing,axis);
-    }
-
-    template<typename t>
-    CImg<T>& _quicksort(const long indm, const long indM, CImg<t>& permutations,
-                        const bool is_increasing, const bool is_permutations) {
-      if (indm<indM) {
-        const long mid = (indm + indM)/2;
-        if (is_increasing) {
-          if ((*this)[indm]>(*this)[mid]) {
-            cimg::swap((*this)[indm],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
-          }
-          if ((*this)[mid]>(*this)[indM]) {
-            cimg::swap((*this)[indM],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indM],permutations[mid]);
-          }
-          if ((*this)[indm]>(*this)[mid]) {
-            cimg::swap((*this)[indm],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
-          }
-        } else {
-          if ((*this)[indm]<(*this)[mid]) {
-            cimg::swap((*this)[indm],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
-          }
-          if ((*this)[mid]<(*this)[indM]) {
-            cimg::swap((*this)[indM],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indM],permutations[mid]);
-          }
-          if ((*this)[indm]<(*this)[mid]) {
-            cimg::swap((*this)[indm],(*this)[mid]);
-            if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
-          }
-        }
-        if (indM - indm>=3) {
-          const T pivot = (*this)[mid];
-          long i = indm, j = indM;
-          if (is_increasing) {
-            do {
-              while ((*this)[i]<pivot) ++i;
-              while ((*this)[j]>pivot) --j;
-              if (i<=j) {
-                if (is_permutations) cimg::swap(permutations[i],permutations[j]);
-                cimg::swap((*this)[i++],(*this)[j--]);
-              }
-            } while (i<=j);
-          } else {
-            do {
-              while ((*this)[i]>pivot) ++i;
-              while ((*this)[j]<pivot) --j;
-              if (i<=j) {
-                if (is_permutations) cimg::swap(permutations[i],permutations[j]);
-                cimg::swap((*this)[i++],(*this)[j--]);
-              }
-            } while (i<=j);
-          }
-          if (indm<j) _quicksort(indm,j,permutations,is_increasing,is_permutations);
-          if (i<indM) _quicksort(i,indM,permutations,is_increasing,is_permutations);
-        }
-      }
-      return *this;
-    }
-
-    //! Compute the SVD of the instance image, viewed as a general matrix.
-    /**
-       Compute the SVD decomposition \c *this=U*S*V' where \c U and \c V are orthogonal matrices
-       and \c S is a diagonal matrix. \c V' denotes the matrix transpose of \c V.
-       \param[out] U First matrix of the SVD product.
-       \param[out] S Coefficients of the second (diagonal) matrix of the SVD product.
-         These coefficients are stored as a vector.
-       \param[out] V Third matrix of the SVD product.
-       \param sorting Tells if the diagonal coefficients are sorted (in decreasing order).
-       \param max_iteration Maximum number of iterations considered for the algorithm convergence.
-       \param lambda Epsilon used for the algorithm convergence.
-       \note The instance matrix can be computed from \c U,\c S and \c V by
-       \code
-       const CImg<> A;  // Input matrix (assumed to contain some values).
-       CImg<> U,S,V;
-       A.SVD(U,S,V)
-       \endcode
-    **/
-    template<typename t>
-    const CImg<T>& SVD(CImg<t>& U, CImg<t>& S, CImg<t>& V, const bool sorting=true,
-                       const unsigned int max_iteration=40, const float lambda=0) const {
-      if (is_empty()) { U.assign(); S.assign(); V.assign(); }
-      else {
-        U = *this;
-        if (lambda!=0) {
-          const unsigned int delta = std::min(U._width,U._height);
-          for (unsigned int i = 0; i<delta; ++i) U(i,i) = (t)(U(i,i) + lambda);
-        }
-        if (S.size()<_width) S.assign(1,_width);
-        if (V._width<_width || V._height<_height) V.assign(_width,_width);
-        CImg<t> rv1(_width);
-        t anorm = 0, c, f, g = 0, h, s, scale = 0;
-        int l = 0, nm = 0;
-
-        cimg_forX(U,i) {
-          l = i + 1; rv1[i] = scale*g; g = s = scale = 0;
-          if (i<height()) {
-            for (int k = i; k<height(); ++k) scale+=cimg::abs(U(i,k));
-            if (scale) {
-              for (int k = i; k<height(); ++k) { U(i,k)/=scale; s+=U(i,k)*U(i,k); }
-              f = U(i,i); g = (t)((f>=0?-1:1)*std::sqrt(s)); h=f*g-s; U(i,i) = f-g;
-              for (int j = l; j<width(); ++j) {
-                s = 0;
-                for (int k=i; k<height(); ++k) s+=U(i,k)*U(j,k);
-                f = s/h;
-                for (int k = i; k<height(); ++k) U(j,k)+=f*U(i,k);
-              }
-              for (int k = i; k<height(); ++k) U(i,k)*=scale;
-            }
-          }
-          S[i]=scale*g;
-
-          g = s = scale = 0;
-          if (i<height() && i!=width() - 1) {
-            for (int k = l; k<width(); ++k) scale+=cimg::abs(U(k,i));
-            if (scale) {
-              for (int k = l; k<width(); ++k) { U(k,i)/= scale; s+=U(k,i)*U(k,i); }
-              f = U(l,i); g = (t)((f>=0?-1:1)*std::sqrt(s)); h = f*g-s; U(l,i) = f-g;
-              for (int k = l; k<width(); ++k) rv1[k]=U(k,i)/h;
-              for (int j = l; j<height(); ++j) {
-                s = 0;
-                for (int k = l; k<width(); ++k) s+=U(k,j)*U(k,i);
-                for (int k = l; k<width(); ++k) U(k,j)+=s*rv1[k];
-              }
-              for (int k = l; k<width(); ++k) U(k,i)*=scale;
-            }
-          }
-          anorm = (t)std::max((float)anorm,(float)(cimg::abs(S[i]) + cimg::abs(rv1[i])));
-        }
-
-        for (int i = width() - 1; i>=0; --i) {
-          if (i<width()-1) {
-            if (g) {
-              for (int j = l; j<width(); ++j) V(i,j) =(U(j,i)/U(l,i))/g;
-              for (int j = l; j<width(); ++j) {
-                s = 0;
-                for (int k = l; k<width(); ++k) s+=U(k,i)*V(j,k);
-                for (int k = l; k<width(); ++k) V(j,k)+=s*V(i,k);
-              }
-            }
-            for (int j = l; j<width(); ++j) V(j,i) = V(i,j) = (t)0.0;
-          }
-          V(i,i) = (t)1.0; g = rv1[i]; l = i;
-        }
-
-        for (int i = std::min(width(),height()) - 1; i>=0; --i) {
-          l = i + 1; g = S[i];
-          for (int j = l; j<width(); ++j) U(j,i) = 0;
-          if (g) {
-            g = 1/g;
-            for (int j = l; j<width(); ++j) {
-              s = 0; for (int k = l; k<height(); ++k) s+=U(i,k)*U(j,k);
-              f = (s/U(i,i))*g;
-              for (int k = i; k<height(); ++k) U(j,k)+=f*U(i,k);
-            }
-            for (int j = i; j<height(); ++j) U(i,j)*= g;
-          } else for (int j = i; j<height(); ++j) U(i,j) = 0;
-          ++U(i,i);
-        }
-
-        for (int k = width() - 1; k>=0; --k) {
-          for (unsigned int its = 0; its<max_iteration; ++its) {
-            bool flag = true;
-            for (l = k; l>=1; --l) {
-              nm = l - 1;
-              if ((cimg::abs(rv1[l]) + anorm)==anorm) { flag = false; break; }
-              if ((cimg::abs(S[nm]) + anorm)==anorm) break;
-            }
-            if (flag) {
-              c = 0; s = 1;
-              for (int i = l; i<=k; ++i) {
-                f = s*rv1[i]; rv1[i] = c*rv1[i];
-                if ((cimg::abs(f) + anorm)==anorm) break;
-                g = S[i]; h = cimg::_hypot(f,g); S[i] = h; h = 1/h; c = g*h; s = -f*h;
-                cimg_forY(U,j) { const t y = U(nm,j), z = U(i,j); U(nm,j) = y*c + z*s; U(i,j) = z*c - y*s; }
-              }
-            }
-
-            const t z = S[k];
-            if (l==k) { if (z<0) { S[k] = -z; cimg_forX(U,j) V(k,j) = -V(k,j); } break; }
-            nm = k - 1;
-            t x = S[l], y = S[nm];
-            g = rv1[nm]; h = rv1[k];
-            f = ((y - z)*(y + z)+(g - h)*(g + h))/std::max((t)1e-25,2*h*y);
-            g = cimg::_hypot(f,(t)1);
-            f = ((x - z)*(x + z)+h*((y/(f + (f>=0?g:-g))) - h))/std::max((t)1e-25,x);
-            c = s = 1;
-            for (int j = l; j<=nm; ++j) {
-              const int i = j + 1;
-              g = rv1[i]; h = s*g; g = c*g;
-              t y = S[i];
-              t z = cimg::_hypot(f,h);
-              rv1[j] = z; c = f/std::max((t)1e-25,z); s = h/std::max((t)1e-25,z);
-              f = x*c + g*s; g = g*c - x*s; h = y*s; y*=c;
-              cimg_forX(U,jj) { const t x = V(j,jj), z = V(i,jj); V(j,jj) = x*c + z*s; V(i,jj) = z*c - x*s; }
-              z = cimg::_hypot(f,h); S[j] = z;
-              if (z) { z = 1/std::max((t)1e-25,z); c = f*z; s = h*z; }
-              f = c*g + s*y; x = c*y - s*g;
-              cimg_forY(U,jj) { const t y = U(j,jj); z = U(i,jj); U(j,jj) = y*c + z*s; U(i,jj) = z*c - y*s; }
-            }
-            rv1[l] = 0; rv1[k]=f; S[k]=x;
-          }
-        }
-
-        if (sorting) {
-          CImg<intT> permutations;
-          CImg<t> tmp(_width);
-          S.sort(permutations,false);
-          cimg_forY(U,k) {
-            cimg_forY(permutations,y) tmp(y) = U(permutations(y),k);
-            std::memcpy(U.data(0,k),tmp._data,sizeof(t)*_width);
-          }
-          cimg_forY(V,k) {
-            cimg_forY(permutations,y) tmp(y) = V(permutations(y),k);
-            std::memcpy(V.data(0,k),tmp._data,sizeof(t)*_width);
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Compute the SVD of the instance image, viewed as a general matrix.
-    /**
-       \return A list of three images <tt>[U; S; V]</tt>, whose meaning is similar as in
-         SVD(CImg<t>&,CImg<t>&,CImg<t>&,bool,unsigned int,float) const.
-    **/
-    CImgList<Tfloat> get_SVD(const bool sorting=true,
-                             const unsigned int max_iteration=40, const float lambda=0) const {
-      CImgList<Tfloat> res(3);
-      SVD(res[0],res[1],res[2],sorting,max_iteration,lambda);
-      return res;
-    }
-
-    // [internal] Compute the LU decomposition of a permuted matrix.
-    template<typename t>
-    CImg<T>& _LU(CImg<t>& indx, bool& d) {
-      const int N = width();
-      int imax = 0;
-      CImg<Tfloat> vv(N);
-      indx.assign(N);
-      d = true;
-      cimg_forX(*this,i) {
-        Tfloat vmax = 0;
-        cimg_forX(*this,j) {
-          const Tfloat tmp = cimg::abs((*this)(j,i));
-          if (tmp>vmax) vmax = tmp;
-        }
-        if (vmax==0) { indx.fill(0); return fill(0); }
-        vv[i] = 1/vmax;
-      }
-      cimg_forX(*this,j) {
-        for (int i = 0; i<j; ++i) {
-          Tfloat sum=(*this)(j,i);
-          for (int k = 0; k<i; ++k) sum-=(*this)(k,i)*(*this)(j,k);
-          (*this)(j,i) = (T)sum;
-        }
-        Tfloat vmax = 0;
-        for (int i = j; i<width(); ++i) {
-          Tfloat sum=(*this)(j,i);
-          for (int k = 0; k<j; ++k) sum-=(*this)(k,i)*(*this)(j,k);
-          (*this)(j,i) = (T)sum;
-          const Tfloat tmp = vv[i]*cimg::abs(sum);
-          if (tmp>=vmax) { vmax=tmp; imax=i; }
-        }
-        if (j!=imax) {
-          cimg_forX(*this,k) cimg::swap((*this)(k,imax),(*this)(k,j));
-          d =!d;
-          vv[imax] = vv[j];
-        }
-        indx[j] = (t)imax;
-        if ((*this)(j,j)==0) (*this)(j,j) = (T)1e-20;
-        if (j<N) {
-          const Tfloat tmp = 1/(Tfloat)(*this)(j,j);
-          for (int i = j + 1; i<N; ++i) (*this)(j,i) = (T)((*this)(j,i)*tmp);
-        }
-      }
-      return *this;
-    }
-
-    //! Compute minimal path in a graph, using the Dijkstra algorithm.
-    /**
-       \param distance An object having operator()(unsigned int i, unsigned int j) which returns distance
-         between two nodes (i,j).
-       \param nb_nodes Number of graph nodes.
-       \param starting_node Indice of the starting node.
-       \param ending_node Indice of the ending node (set to ~0U to ignore ending node).
-       \param previous_node Array that gives the previous node indice in the path to the starting node
-         (optional parameter).
-       \return Array of distances of each node to the starting node.
-    **/
-    template<typename tf, typename t>
-    static CImg<T> dijkstra(const tf& distance, const unsigned int nb_nodes,
-                            const unsigned int starting_node, const unsigned int ending_node,
-                            CImg<t>& previous_node) {
-      if (starting_node>=nb_nodes)
-        throw CImgArgumentException("CImg<%s>::dijkstra(): Specified indice of starting node %u is higher "
-                                    "than number of nodes %u.",
-                                    pixel_type(),starting_node,nb_nodes);
-      CImg<T> dist(1,nb_nodes,1,1,cimg::type<T>::max());
-      dist(starting_node) = 0;
-      previous_node.assign(1,nb_nodes,1,1,(t)-1);
-      previous_node(starting_node) = (t)starting_node;
-      CImg<uintT> Q(nb_nodes);
-      cimg_forX(Q,u) Q(u) = (unsigned int)u;
-      cimg::swap(Q(starting_node),Q(0));
-      unsigned int sizeQ = nb_nodes;
-      while (sizeQ) {
-        // Update neighbors from minimal vertex
-        const unsigned int umin = Q(0);
-        if (umin==ending_node) sizeQ = 0;
-        else {
-          const T dmin = dist(umin);
-          const T infty = cimg::type<T>::max();
-          for (unsigned int q = 1; q<sizeQ; ++q) {
-            const unsigned int v = Q(q);
-            const T d = (T)distance(v,umin);
-            if (d<infty) {
-              const T alt = dmin + d;
-              if (alt<dist(v)) {
-                dist(v) = alt;
-                previous_node(v) = (t)umin;
-                const T distpos = dist(Q(q));
-                for (unsigned int pos = q, par = 0; pos && distpos<dist(Q(par=(pos + 1)/2 - 1)); pos=par)
-                  cimg::swap(Q(pos),Q(par));
-              }
-            }
-          }
-          // Remove minimal vertex from queue
-          Q(0) = Q(--sizeQ);
-          const T distpos = dist(Q(0));
-          for (unsigned int pos = 0, left = 0, right = 0;
-               ((right=2*(pos + 1),(left=right - 1))<sizeQ && distpos>dist(Q(left))) ||
-                 (right<sizeQ && distpos>dist(Q(right)));) {
-            if (right<sizeQ) {
-              if (dist(Q(left))<dist(Q(right))) { cimg::swap(Q(pos),Q(left)); pos = left; }
-              else { cimg::swap(Q(pos),Q(right)); pos = right; }
-            } else { cimg::swap(Q(pos),Q(left)); pos = left; }
-          }
-        }
-      }
-      return dist;
-    }
-
-    //! Return minimal path in a graph, using the Dijkstra algorithm.
-    template<typename tf, typename t>
-    static CImg<T> dijkstra(const tf& distance, const unsigned int nb_nodes,
-                            const unsigned int starting_node, const unsigned int ending_node=~0U) {
-      CImg<uintT> foo;
-      return dijkstra(distance,nb_nodes,starting_node,ending_node,foo);
-    }
-
-    //! Return minimal path in a graph, using the Dijkstra algorithm.
-    /**
-       \param starting_node Indice of the starting node.
-       \param ending_node Indice of the ending node.
-       \param previous_node Array that gives the previous node indice in the path to the starting node
-         (optional parameter).
-       \return Array of distances of each node to the starting node.
-       \note image instance corresponds to the adjacency matrix of the graph.
-    **/
-    template<typename t>
-    CImg<T>& dijkstra(const unsigned int starting_node, const unsigned int ending_node,
-                      CImg<t>& previous_node) {
-      return get_dijkstra(starting_node,ending_node,previous_node).move_to(*this);
-    }
-
-    //! Return minimal path in a graph, using the Dijkstra algorithm \newinstance.
-    template<typename t>
-    CImg<T> get_dijkstra(const unsigned int starting_node, const unsigned int ending_node,
-                         CImg<t>& previous_node) const {
-      if (_width!=_height || _depth!=1 || _spectrum!=1)
-        throw CImgInstanceException(_cimg_instance
-                                    "dijkstra(): Instance is not a graph adjacency matrix.",
-                                    cimg_instance);
-
-      return dijkstra(*this,_width,starting_node,ending_node,previous_node);
-    }
-
-    //! Return minimal path in a graph, using the Dijkstra algorithm.
-    CImg<T>& dijkstra(const unsigned int starting_node, const unsigned int ending_node=~0U) {
-      return get_dijkstra(starting_node,ending_node).move_to(*this);
-    }
-
-    //! Return minimal path in a graph, using the Dijkstra algorithm \newinstance.
-    CImg<Tfloat> get_dijkstra(const unsigned int starting_node, const unsigned int ending_node=~0U) const {
-      CImg<uintT> foo;
-      return get_dijkstra(starting_node,ending_node,foo);
-    }
-
-    //! Return an image containing the ascii codes of the specified  string.
-    /**
-       \param str input C-string to encode as an image.
-       \param is_last_zero Tells if the ending \c '0' character appear in the resulting image.
-    **/
-    static CImg<T> string(const char *const str, const bool is_last_zero=true, const bool is_shared=false) {
-      if (!str) return CImg<T>();
-      return CImg<T>(str,(unsigned int)std::strlen(str) + (is_last_zero?1:0),1,1,1,is_shared);
-    }
-
-    //! Return a \c 1x1 image containing specified value.
-    /**
-       \param a0 First vector value.
-    **/
-    static CImg<T> vector(const T& a0) {
-      CImg<T> r(1,1);
-      r[0] = a0;
-      return r;
-    }
-
-    //! Return a \c 1x2 image containing specified values.
-    /**
-       \param a0 First vector value.
-       \param a1 Second vector value.
-    **/
-    static CImg<T> vector(const T& a0, const T& a1) {
-      CImg<T> r(1,2); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1;
-      return r;
-    }
-
-    //! Return a \c 1x3 image containing specified values.
-    /**
-       \param a0 First vector value.
-       \param a1 Second vector value.
-       \param a2 Third vector value.
-    **/
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2) {
-      CImg<T> r(1,3); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2;
-      return r;
-    }
-
-    //! Return a \c 1x4 image containing specified values.
-    /**
-       \param a0 First vector value.
-       \param a1 Second vector value.
-       \param a2 Third vector value.
-       \param a3 Fourth vector value.
-    **/
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3) {
-      CImg<T> r(1,4); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      return r;
-    }
-
-    //! Return a \c 1x5 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4) {
-      CImg<T> r(1,5); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4;
-      return r;
-    }
-
-    //! Return a \c 1x6 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4, const T& a5) {
-      CImg<T> r(1,6); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4; *(ptr++) = a5;
-      return r;
-    }
-
-    //! Return a \c 1x7 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6) {
-      CImg<T> r(1,7); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6;
-      return r;
-    }
-
-    //! Return a \c 1x8 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7) {
-      CImg<T> r(1,8); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      return r;
-    }
-
-    //! Return a \c 1x9 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8) {
-      CImg<T> r(1,9); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8;
-      return r;
-    }
-
-    //! Return a \c 1x10 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9) {
-      CImg<T> r(1,10); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9;
-      return r;
-    }
-
-    //! Return a \c 1x11 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10) {
-      CImg<T> r(1,11); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10;
-      return r;
-    }
-
-    //! Return a \c 1x12 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11) {
-      CImg<T> r(1,12); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      return r;
-    }
-
-    //! Return a \c 1x13 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11,
-                          const T& a12) {
-      CImg<T> r(1,13); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      *(ptr++) = a12;
-      return r;
-    }
-
-    //! Return a \c 1x14 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11,
-                          const T& a12, const T& a13) {
-      CImg<T> r(1,14); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      *(ptr++) = a12; *(ptr++) = a13;
-      return r;
-    }
-
-    //! Return a \c 1x15 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11,
-                          const T& a12, const T& a13, const T& a14) {
-      CImg<T> r(1,15); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14;
-      return r;
-    }
-
-    //! Return a \c 1x16 image containing specified values.
-    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11,
-                          const T& a12, const T& a13, const T& a14, const T& a15) {
-      CImg<T> r(1,16); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14; *(ptr++) = a15;
-      return r;
-    }
-
-    //! Return a 1x1 matrix containing specified coefficients.
-    /**
-       \param a0 First matrix value.
-       \note Equivalent to vector(const T&).
-    **/
-    static CImg<T> matrix(const T& a0) {
-      return vector(a0);
-    }
-
-    //! Return a 2x2 matrix containing specified coefficients.
-    /**
-       \param a0 First matrix value.
-       \param a1 Second matrix value.
-       \param a2 Third matrix value.
-       \param a3 Fourth matrix value.
-    **/
-    static CImg<T> matrix(const T& a0, const T& a1,
-                          const T& a2, const T& a3) {
-      CImg<T> r(2,2); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1;
-      *(ptr++) = a2; *(ptr++) = a3;
-      return r;
-    }
-
-    //! Return a 3x3 matrix containing specified coefficients.
-    /**
-       \param a0 First matrix value.
-       \param a1 Second matrix value.
-       \param a2 Third matrix value.
-       \param a3 Fourth matrix value.
-       \param a4 Fifth matrix value.
-       \param a5 Sixth matrix value.
-       \param a6 Seventh matrix value.
-       \param a7 Eighth matrix value.
-       \param a8 Nineth matrix value.
-    **/
-    static CImg<T> matrix(const T& a0, const T& a1, const T& a2,
-                          const T& a3, const T& a4, const T& a5,
-                          const T& a6, const T& a7, const T& a8) {
-      CImg<T> r(3,3); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2;
-      *(ptr++) = a3; *(ptr++) = a4; *(ptr++) = a5;
-      *(ptr++) = a6; *(ptr++) = a7; *(ptr++) = a8;
-      return r;
-    }
-
-    //! Return a 4x4 matrix containing specified coefficients.
-    static CImg<T> matrix(const T& a0, const T& a1, const T& a2, const T& a3,
-                          const T& a4, const T& a5, const T& a6, const T& a7,
-                          const T& a8, const T& a9, const T& a10, const T& a11,
-                          const T& a12, const T& a13, const T& a14, const T& a15) {
-      CImg<T> r(4,4); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
-      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
-      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
-      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14; *(ptr++) = a15;
-      return r;
-    }
-
-    //! Return a 5x5 matrix containing specified coefficients.
-    static CImg<T> matrix(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4,
-                          const T& a5, const T& a6, const T& a7, const T& a8, const T& a9,
-                          const T& a10, const T& a11, const T& a12, const T& a13, const T& a14,
-                          const T& a15, const T& a16, const T& a17, const T& a18, const T& a19,
-                          const T& a20, const T& a21, const T& a22, const T& a23, const T& a24) {
-      CImg<T> r(5,5); T *ptr = r._data;
-      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4;
-      *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7; *(ptr++) = a8; *(ptr++) = a9;
-      *(ptr++) = a10; *(ptr++) = a11; *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14;
-      *(ptr++) = a15; *(ptr++) = a16; *(ptr++) = a17; *(ptr++) = a18; *(ptr++) = a19;
-      *(ptr++) = a20; *(ptr++) = a21; *(ptr++) = a22; *(ptr++) = a23; *(ptr++) = a24;
-      return r;
-    }
-
-    //! Return a 1x1 symmetric matrix containing specified coefficients.
-    /**
-       \param a0 First matrix value.
-       \note Equivalent to vector(const T&).
-    **/
-    static CImg<T> tensor(const T& a0) {
-      return matrix(a0);
-    }
-
-    //! Return a 2x2 symmetric matrix tensor containing specified coefficients.
-    static CImg<T> tensor(const T& a0, const T& a1, const T& a2) {
-      return matrix(a0,a1,a1,a2);
-    }
-
-    //! Return a 3x3 symmetric matrix containing specified coefficients.
-    static CImg<T> tensor(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4, const T& a5) {
-      return matrix(a0,a1,a2,a1,a3,a4,a2,a4,a5);
-    }
-
-    //! Return a 1x1 diagonal matrix containing specified coefficients.
-    static CImg<T> diagonal(const T& a0) {
-      return matrix(a0);
-    }
-
-    //! Return a 2x2 diagonal matrix containing specified coefficients.
-    static CImg<T> diagonal(const T& a0, const T& a1) {
-      return matrix(a0,0,0,a1);
-    }
-
-    //! Return a 3x3 diagonal matrix containing specified coefficients.
-    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2) {
-      return matrix(a0,0,0,0,a1,0,0,0,a2);
-    }
-
-    //! Return a 4x4 diagonal matrix containing specified coefficients.
-    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2, const T& a3) {
-      return matrix(a0,0,0,0,0,a1,0,0,0,0,a2,0,0,0,0,a3);
-    }
-
-    //! Return a 5x5 diagonal matrix containing specified coefficients.
-    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4) {
-      return matrix(a0,0,0,0,0,0,a1,0,0,0,0,0,a2,0,0,0,0,0,a3,0,0,0,0,0,a4);
-    }
-
-    //! Return a NxN identity matrix.
-    /**
-       \param N Dimension of the matrix.
-    **/
-    static CImg<T> identity_matrix(const unsigned int N) {
-      CImg<T> res(N,N,1,1,0);
-      cimg_forX(res,x) res(x,x) = 1;
-      return res;
-    }
-
-    //! Return a N-numbered sequence vector from \p a0 to \p a1.
-    /**
-       \param N Size of the resulting vector.
-       \param a0 Starting value of the sequence.
-       \param a1 Ending value of the sequence.
-     **/
-    static CImg<T> sequence(const unsigned int N, const T& a0, const T& a1) {
-      if (N) return CImg<T>(1,N).sequence(a0,a1);
-      return CImg<T>();
-    }
-
-    //! Return a 3x3 rotation matrix from an { axis + angle } or a quaternion.
-    /**
-       \param x X-coordinate of the rotation axis, or first quaternion coordinate.
-       \param y Y-coordinate of the rotation axis, or second quaternion coordinate.
-       \param z Z-coordinate of the rotation axis, or third quaternion coordinate.
-       \param w Angle of the rotation axis (in degree), or fourth quaternion coordinate.
-       \param is_quaternion Tell is the four arguments denotes a set { axis + angle } or a quaternion (x,y,z,w).
-     **/
-    static CImg<T> rotation_matrix(const float x, const float y, const float z, const float w,
-                                   const bool is_quaternion=false) {
-      double X, Y, Z, W, N;
-      if (is_quaternion) {
-        N = std::sqrt((double)x*x + (double)y*y + (double)z*z + (double)w*w);
-        if (N>0) { X = x/N; Y = y/N; Z = z/N; W = w/N; }
-        else { X = Y = Z = 0; W = 1; }
-        return CImg<T>::matrix((T)(X*X + Y*Y - Z*Z - W*W),(T)(2*Y*Z - 2*X*W),(T)(2*X*Z + 2*Y*W),
-                               (T)(2*X*W + 2*Y*Z),(T)(X*X - Y*Y + Z*Z - W*W),(T)(2*Z*W - 2*X*Y),
-                               (T)(2*Y*W - 2*X*Z),(T)(2*X*Y + 2*Z*W),(T)(X*X - Y*Y - Z*Z + W*W));
-      }
-      N = cimg::hypot((double)x,(double)y,(double)z);
-      if (N>0) { X = x/N; Y = y/N; Z = z/N; }
-      else { X = Y = 0; Z = 1; }
-      const double ang = w*cimg::PI/180, c = std::cos(ang), omc = 1 - c, s = std::sin(ang);
-      return CImg<T>::matrix((T)(X*X*omc + c),(T)(X*Y*omc - Z*s),(T)(X*Z*omc + Y*s),
-                             (T)(X*Y*omc + Z*s),(T)(Y*Y*omc + c),(T)(Y*Z*omc - X*s),
-                             (T)(X*Z*omc - Y*s),(T)(Y*Z*omc + X*s),(T)(Z*Z*omc + c));
-    }
-
-    //@}
-    //-----------------------------------
-    //
-    //! \name Value Manipulation
-    //@{
-    //-----------------------------------
-
-    //! Fill all pixel values with specified value.
-    /**
-       \param val Fill value.
-    **/
-    CImg<T>& fill(const T& val) {
-      if (is_empty()) return *this;
-      if (val && sizeof(T)!=1) cimg_for(*this,ptrd,T) *ptrd = val;
-      else std::memset(_data,(int)val,sizeof(T)*size());
-      return *this;
-    }
-
-    //! Fill all pixel values with specified value \newinstance.
-    CImg<T> get_fill(const T& val) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val);
-    }
-
-    //! Fill sequentially all pixel values with specified values.
-    /**
-       \param val0 First fill value.
-       \param val1 Second fill value.
-    **/
-    CImg<T>& fill(const T& val0, const T& val1) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 1;
-      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; }
-      if (ptrd!=ptre + 1) *(ptrd++) = val0;
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 2;
-      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; }
-      ptre+=2;
-      switch (ptre - ptrd) {
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 3;
-      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; }
-      ptre+=3;
-      switch (ptre - ptrd) {
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 4;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4;
-      }
-      ptre+=4;
-      switch (ptre - ptrd) {
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 5;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-      }
-      ptre+=5;
-      switch (ptre - ptrd) {
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 6;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6;
-      }
-      ptre+=6;
-      switch (ptre - ptrd) {
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 7;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3;
-        *(ptrd++) = val4; *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7;
-      }
-      ptre+=7;
-      switch (ptre - ptrd) {
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 8;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2;
-        *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8;
-      }
-      ptre+=8;
-      switch (ptre - ptrd) {
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 9;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4;
-        *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9;
-      }
-      ptre+=9;
-      switch (ptre - ptrd) {
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 10;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4;
-        *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9;
-        *(ptrd++) = val10;
-      }
-      ptre+=10;
-      switch (ptre - ptrd) {
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 11;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
-      }
-      ptre+=11;
-      switch (ptre - ptrd) {
-      case 11 : *(--ptre) = val10;
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,
-                                                           val11);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                  const T& val12) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 12;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
-        *(ptrd++) = val12;
-      }
-      ptre+=12;
-      switch (ptre - ptrd) {
-      case 12 : *(--ptre) = val11;
-      case 11 : *(--ptre) = val10;
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                     const T& val12) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,
-                                                           val11,val12);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                  const T& val12, const T& val13) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 13;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
-        *(ptrd++) = val12; *(ptrd++) = val13;
-      }
-      ptre+=13;
-      switch (ptre - ptrd) {
-      case 13 : *(--ptre) = val12;
-      case 12 : *(--ptre) = val11;
-      case 11 : *(--ptre) = val10;
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                     const T& val12, const T& val13) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,
-                                                           val11,val12,val13);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                  const T& val12, const T& val13, const T& val14) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 14;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
-        *(ptrd++) = val12; *(ptrd++) = val13; *(ptrd++) = val14;
-      }
-      ptre+=14;
-      switch (ptre - ptrd) {
-      case 14 : *(--ptre) = val13;
-      case 13 : *(--ptre) = val12;
-      case 12 : *(--ptre) = val11;
-      case 11 : *(--ptre) = val10;
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                     const T& val12, const T& val13, const T& val14) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,
-                                                           val11,val12,val13,val14);
-    }
-
-    //! Fill sequentially all pixel values with specified values \overloading.
-    CImg<T>& fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                  const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                  const T& val12, const T& val13, const T& val14, const T& val15) {
-      if (is_empty()) return *this;
-      T *ptrd, *ptre = end() - 15;
-      for (ptrd = _data; ptrd<ptre; ) {
-        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
-        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
-        *(ptrd++) = val12; *(ptrd++) = val13; *(ptrd++) = val14; *(ptrd++) = val15;
-      }
-      ptre+=15;
-      switch (ptre - ptrd) {
-      case 15 : *(--ptre) = val14;
-      case 14 : *(--ptre) = val13;
-      case 13 : *(--ptre) = val12;
-      case 12 : *(--ptre) = val11;
-      case 11 : *(--ptre) = val10;
-      case 10 : *(--ptre) = val9;
-      case 9 : *(--ptre) = val8;
-      case 8 : *(--ptre) = val7;
-      case 7 : *(--ptre) = val6;
-      case 6 : *(--ptre) = val5;
-      case 5 : *(--ptre) = val4;
-      case 4 : *(--ptre) = val3;
-      case 3 : *(--ptre) = val2;
-      case 2 : *(--ptre) = val1;
-      case 1 : *(--ptre) = val0;
-      }
-      return *this;
-    }
-
-    //! Fill sequentially all pixel values with specified values \newinstance.
-    CImg<T> get_fill(const T& val0, const T& val1, const T& val2, const T& val3, const T& val4, const T& val5,
-                     const T& val6, const T& val7, const T& val8, const T& val9, const T& val10, const T& val11,
-                     const T& val12, const T& val13, const T& val14, const T& val15) const {
-      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,
-                                                           val11,val12,val13,val14,val15);
-    }
-
-    //! Fill sequentially pixel values according to a given expression.
-    /**
-       \param expression C-string describing a math formula, or a sequence of values.
-       \param repeat_values In case a list of values is provided, tells if this list must be repeated for the filling.
-       \param list_inputs In case of a mathematical expression, attach a list of images to the specified expression.
-       \param list_outputs In case of a mathematical expression, attach a list of images to the specified expression.
-    **/
-    CImg<T>& fill(const char *const expression, const bool repeat_values, const bool allow_formula=true,
-                  const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) {
-      return _fill(expression,repeat_values,allow_formula,list_inputs,list_outputs,"fill",0);
-    }
-
-    CImg<T>& _fill(const char *const expression, const bool repeat_values, bool allow_formula,
-                   const CImgList<T> *const list_inputs, CImgList<T> *const list_outputs,
-                   const char *const calling_function, const CImg<T> *provides_copy) {
-      if (is_empty() || !expression || !*expression) return *this;
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      CImg<charT> is_error;
-      bool is_value_sequence = false;
-
-      if (allow_formula) {
-
-        // Try to pre-detect regular value sequence to avoid exception thrown by _cimg_math_parser.
-        double value;
-        char sep;
-        const int err = cimg_sscanf(expression,"%lf %c",&value,&sep);
-        if (err==1 || (err==2 && sep==',')) {
-          if (err==1) return fill((T)value);
-          else is_value_sequence = true;
-        }
-
-        // Try to fill values according to a formula.
-        cimg_abort_init;
-        if (!is_value_sequence) try {
-            CImg<T> base = provides_copy?provides_copy->get_shared():get_shared();
-            _cimg_math_parser mp(expression + (*expression=='>' || *expression=='<' ||
-                                               *expression=='*' || *expression==':'),
-                                 calling_function,base,this,list_inputs,list_outputs,true);
-            if (!provides_copy && expression && *expression!='>' && *expression!='<' && *expression!=':' &&
-                mp.need_input_copy)
-              base.assign().assign(*this); // Needs input copy
-
-            bool do_in_parallel = false;
-#ifdef cimg_use_openmp
-            cimg_openmp_if(*expression=='*' || *expression==':' ||
-                           (mp.is_parallelizable && _width>=320 && _height*_depth*_spectrum>=2))
-              do_in_parallel = true;
-#endif
-            if (mp.result_dim) { // Vector-valued expression
-              const unsigned int N = std::min(mp.result_dim,_spectrum);
-              const ulongT whd = (ulongT)_width*_height*_depth;
-              T *ptrd = *expression=='<'?_data + _width*_height*_depth - 1:_data;
-              if (*expression=='<') {
-                CImg<doubleT> res(1,mp.result_dim);
-                cimg_rofYZ(*this,y,z) {
-                  cimg_abort_test();
-                  cimg_rofX(*this,x) {
-                    mp(x,y,z,0,res._data);
-                    const double *ptrs = res._data;
-                    T *_ptrd = ptrd--; for (unsigned int n = N; n>0; --n) { *_ptrd = (T)(*ptrs++); _ptrd+=whd; }
-                  }
-                }
-              } else if (*expression=='>' || !do_in_parallel) {
-                CImg<doubleT> res(1,mp.result_dim);
-                cimg_forYZ(*this,y,z) {
-                  cimg_abort_test();
-                  cimg_forX(*this,x) {
-                    mp(x,y,z,0,res._data);
-                    const double *ptrs = res._data;
-                    T *_ptrd = ptrd++; for (unsigned int n = N; n>0; --n) { *_ptrd = (T)(*ptrs++); _ptrd+=whd; }
-                  }
-                }
-             } else {
-#ifdef cimg_use_openmp
-                cimg_pragma_openmp(parallel)
-                {
-                  _cimg_math_parser
-                    _mp = omp_get_thread_num()?mp:_cimg_math_parser(),
-                    &lmp = omp_get_thread_num()?_mp:mp;
-                  lmp.is_fill = true;
-                  cimg_pragma_openmp(for collapse(2))
-                    cimg_forYZ(*this,y,z) cimg_abort_try {
-                    cimg_abort_test();
-                    CImg<doubleT> res(1,lmp.result_dim);
-                    T *ptrd = data(0,y,z,0);
-                    cimg_forX(*this,x) {
-                      lmp(x,y,z,0,res._data);
-                      const double *ptrs = res._data;
-                      T *_ptrd = ptrd++; for (unsigned int n = N; n>0; --n) { *_ptrd = (T)(*ptrs++); _ptrd+=whd; }
-                    }
-                  } cimg_abort_catch() cimg_abort_catch_fill()
-                }
-#endif
-              }
-
-            } else { // Scalar-valued expression
-              T *ptrd = *expression=='<'?end() - 1:_data;
-              if (*expression=='<')
-                cimg_rofYZC(*this,y,z,c) { cimg_abort_test(); cimg_rofX(*this,x) *(ptrd--) = (T)mp(x,y,z,c); }
-              else if (*expression=='>' || !do_in_parallel)
-                cimg_forYZC(*this,y,z,c) { cimg_abort_test(); cimg_forX(*this,x) *(ptrd++) = (T)mp(x,y,z,c); }
-              else {
-#ifdef cimg_use_openmp
-                cimg_pragma_openmp(parallel)
-                {
-                  _cimg_math_parser
-                    _mp = omp_get_thread_num()?mp:_cimg_math_parser(),
-                    &lmp = omp_get_thread_num()?_mp:mp;
-                  lmp.is_fill = true;
-                  cimg_pragma_openmp(for collapse(3))
-                    cimg_forYZC(*this,y,z,c) cimg_abort_try {
-                    cimg_abort_test();
-                    T *ptrd = data(0,y,z,c);
-                    cimg_forX(*this,x) *ptrd++ = (T)lmp(x,y,z,c);
-                  } cimg_abort_catch() cimg_abort_catch_fill()
-                }
-#endif
-              }
-            }
-            mp.end();
-          } catch (CImgException& e) { CImg<charT>::string(e._message).move_to(is_error); }
-      }
-
-      // Try to fill values according to a value sequence.
-      if (!allow_formula || is_value_sequence || is_error) {
-        CImg<charT> item(256);
-        char sep = 0;
-        const char *nexpression = expression;
-        ulongT nb = 0;
-        const ulongT siz = size();
-        T *ptrd = _data;
-        for (double val = 0; *nexpression && nb<siz; ++nb) {
-          sep = 0;
-          const int err = cimg_sscanf(nexpression,"%255[ \n\t0-9.eEinfa+-]%c",item._data,&sep);
-          if (err>0 && cimg_sscanf(item,"%lf",&val)==1 && (sep==',' || sep==';' || err==1)) {
-            nexpression+=std::strlen(item) + (err>1);
-            *(ptrd++) = (T)val;
-          } else break;
-        }
-        cimg::exception_mode(omode);
-        if (nb<siz && (sep || *nexpression)) {
-          if (is_error) throw CImgArgumentException("%s",is_error._data);
-          else throw CImgArgumentException(_cimg_instance
-                                           "%s(): Invalid sequence of filling values '%s'.",
-                                           cimg_instance,calling_function,expression);
-        }
-        if (repeat_values && nb && nb<siz)
-          for (T *ptrs = _data, *const ptre = _data + siz; ptrd<ptre; ++ptrs) *(ptrd++) = *ptrs;
-      }
-
-      cimg::exception_mode(omode);
-      cimg_abort_test();
-      return *this;
-    }
-
-    //! Fill sequentially pixel values according to a given expression \newinstance.
-    CImg<T> get_fill(const char *const expression, const bool repeat_values, const bool allow_formula=true,
-                     const CImgList<T> *const list_inputs=0, CImgList<T> *const list_outputs=0) const {
-      return (+*this).fill(expression,repeat_values,allow_formula,list_inputs,list_outputs);
-    }
-
-    //! Fill sequentially pixel values according to the values found in another image.
-    /**
-       \param values Image containing the values used for the filling.
-       \param repeat_values In case there are less values than necessary in \c values, tells if these values must be
-         repeated for the filling.
-    **/
-    template<typename t>
-    CImg<T>& fill(const CImg<t>& values, const bool repeat_values=true) {
-      if (is_empty() || !values) return *this;
-      T *ptrd = _data, *ptre = ptrd + size();
-      for (t *ptrs = values._data, *ptrs_end = ptrs + values.size(); ptrs<ptrs_end && ptrd<ptre; ++ptrs)
-        *(ptrd++) = (T)*ptrs;
-      if (repeat_values && ptrd<ptre) for (T *ptrs = _data; ptrd<ptre; ++ptrs) *(ptrd++) = *ptrs;
-      return *this;
-    }
-
-    //! Fill sequentially pixel values according to the values found in another image \newinstance.
-    template<typename t>
-    CImg<T> get_fill(const CImg<t>& values, const bool repeat_values=true) const {
-      return repeat_values?CImg<T>(_width,_height,_depth,_spectrum).fill(values,repeat_values):
-        (+*this).fill(values,repeat_values);
-    }
-
-    //! Fill pixel values along the X-axis at a specified pixel position.
-    /**
-       \param y Y-coordinate of the filled column.
-       \param z Z-coordinate of the filled column.
-       \param c C-coordinate of the filled column.
-       \param a0 First fill value.
-    **/
-    CImg<T>& fillX(const unsigned int y, const unsigned int z, const unsigned int c, const int a0, ...) {
-#define _cimg_fill1(x,y,z,c,off,siz,t) { \
-    va_list ap; va_start(ap,a0); T *ptrd = data(x,y,z,c); *ptrd = (T)a0; \
-    for (unsigned int k = 1; k<siz; ++k) { ptrd+=off; *ptrd = (T)va_arg(ap,t); } \
-    va_end(ap); }
-      if (y<_height && z<_depth && c<_spectrum) _cimg_fill1(0,y,z,c,1,_width,int);
-      return *this;
-    }
-
-    //! Fill pixel values along the X-axis at a specified pixel position \overloading.
-    CImg<T>& fillX(const unsigned int y, const unsigned int z, const unsigned int c, const double a0, ...) {
-      if (y<_height && z<_depth && c<_spectrum) _cimg_fill1(0,y,z,c,1,_width,double);
-      return *this;
-    }
-
-    //! Fill pixel values along the Y-axis at a specified pixel position.
-    /**
-       \param x X-coordinate of the filled row.
-       \param z Z-coordinate of the filled row.
-       \param c C-coordinate of the filled row.
-       \param a0 First fill value.
-    **/
-    CImg<T>& fillY(const unsigned int x, const unsigned int z, const unsigned int c, const int a0, ...) {
-      if (x<_width && z<_depth && c<_spectrum) _cimg_fill1(x,0,z,c,_width,_height,int);
-      return *this;
-    }
-
-    //! Fill pixel values along the Y-axis at a specified pixel position \overloading.
-    CImg<T>& fillY(const unsigned int x, const unsigned int z, const unsigned int c, const double a0, ...) {
-      if (x<_width && z<_depth && c<_spectrum) _cimg_fill1(x,0,z,c,_width,_height,double);
-      return *this;
-    }
-
-    //! Fill pixel values along the Z-axis at a specified pixel position.
-    /**
-       \param x X-coordinate of the filled slice.
-       \param y Y-coordinate of the filled slice.
-       \param c C-coordinate of the filled slice.
-       \param a0 First fill value.
-    **/
-    CImg<T>& fillZ(const unsigned int x, const unsigned int y, const unsigned int c, const int a0, ...) {
-      const ulongT wh = (ulongT)_width*_height;
-      if (x<_width && y<_height && c<_spectrum) _cimg_fill1(x,y,0,c,wh,_depth,int);
-      return *this;
-    }
-
-    //! Fill pixel values along the Z-axis at a specified pixel position \overloading.
-    CImg<T>& fillZ(const unsigned int x, const unsigned int y, const unsigned int c, const double a0, ...) {
-      const ulongT wh = (ulongT)_width*_height;
-      if (x<_width && y<_height && c<_spectrum) _cimg_fill1(x,y,0,c,wh,_depth,double);
-      return *this;
-    }
-
-    //! Fill pixel values along the C-axis at a specified pixel position.
-    /**
-       \param x X-coordinate of the filled channel.
-       \param y Y-coordinate of the filled channel.
-       \param z Z-coordinate of the filled channel.
-       \param a0 First filling value.
-    **/
-    CImg<T>& fillC(const unsigned int x, const unsigned int y, const unsigned int z, const int a0, ...) {
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      if (x<_width && y<_height && z<_depth) _cimg_fill1(x,y,z,0,whd,_spectrum,int);
-      return *this;
-    }
-
-    //! Fill pixel values along the C-axis at a specified pixel position \overloading.
-    CImg<T>& fillC(const unsigned int x, const unsigned int y, const unsigned int z, const double a0, ...) {
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      if (x<_width && y<_height && z<_depth) _cimg_fill1(x,y,z,0,whd,_spectrum,double);
-      return *this;
-    }
-
-    //! Discard specified sequence of values in the image buffer, along a specific axis.
-    /**
-       \param values Sequence of values to discard.
-       \param axis Axis along which the values are discarded. If set to \c 0 (default value)
-         the method does it for all the buffer values and returns a one-column vector.
-       \note Discarded values will change the image geometry, so the resulting image
-       is returned as a one-column vector.
-    **/
-    template<typename t>
-    CImg<T>& discard(const CImg<t>& values, const char axis=0) {
-      if (is_empty() || !values) return *this;
-      return get_discard(values,axis).move_to(*this);
-    }
-
-    template<typename t>
-    CImg<T> get_discard(const CImg<t>& values, const char axis=0) const {
-      CImg<T> res;
-      if (!values) return +*this;
-      if (is_empty()) return res;
-      const ulongT vsiz = values.size();
-      const char _axis = cimg::lowercase(axis);
-      ulongT j = 0;
-      unsigned int k = 0;
-      int i0 = 0;
-      res.assign(width(),height(),depth(),spectrum());
-      switch (_axis) {
-      case 'x' : {
-        cimg_forX(*this,i) {
-          if ((*this)(i)!=(T)values[j]) {
-            if (j) --i;
-            res.draw_image(k,get_columns(i0,i));
-            k+=i - i0 + 1; i0 = i + 1; j = 0;
-          } else { ++j; if (j>=vsiz) { j = 0; i0 = i + 1; } }
-        }
-        if (i0<width()) { res.draw_image(k,get_columns(i0,width() - 1)); k+=width() - i0; }
-        res.resize(k,-100,-100,-100,0);
-      } break;
-      case 'y' : {
-        cimg_forY(*this,i) {
-          if ((*this)(0,i)!=(T)values[j]) {
-            if (j) --i;
-            res.draw_image(0,k,get_rows(i0,i));
-            k+=i - i0 + 1; i0 = i + 1; j = 0;
-          } else { ++j; if (j>=vsiz) { j = 0; i0 = i + 1; } }
-        }
-        if (i0<height()) { res.draw_image(0,k,get_rows(i0,height() - 1)); k+=height() - i0; }
-        res.resize(-100,k,-100,-100,0);
-      } break;
-      case 'z' : {
-        cimg_forZ(*this,i) {
-          if ((*this)(0,0,i)!=(T)values[j]) {
-            if (j) --i;
-            res.draw_image(0,0,k,get_slices(i0,i));
-            k+=i - i0 + 1; i0 = i + 1; j = 0;
-          } else { ++j; if (j>=vsiz) { j = 0; i0 = i + 1; } }
-        }
-        if (i0<depth()) { res.draw_image(0,0,k,get_slices(i0,height() - 1)); k+=depth() - i0; }
-        res.resize(-100,-100,k,-100,0);
-      } break;
-      case 'c' : {
-        cimg_forC(*this,i) {
-          if ((*this)(0,0,0,i)!=(T)values[j]) {
-            if (j) --i;
-            res.draw_image(0,0,0,k,get_channels(i0,i));
-            k+=i - i0 + 1; i0 = i + 1; j = 0;
-          } else { ++j; if (j>=vsiz) { j = 0; i0 = i + 1; } }
-        }
-        if (i0<spectrum()) { res.draw_image(0,0,k,get_channels(i0,height() - 1)); k+=spectrum() - i0; }
-        res.resize(-100,-100,-100,k,0);
-      } break;
-      default : {
-        res.unroll('y');
-        cimg_foroff(*this,i) {
-          if ((*this)[i]!=(T)values[j]) {
-            if (j) --i;
-            std::memcpy(res._data + k,_data + i0,(i - i0 + 1)*sizeof(T));
-            k+=i - i0 + 1; i0 = (int)i + 1; j = 0;
-          } else { ++j; if (j>=vsiz) { j = 0; i0 = (int)i + 1; }}
-        }
-        const ulongT siz = size();
-        if ((ulongT)i0<siz) { std::memcpy(res._data + k,_data + i0,(siz - i0)*sizeof(T)); k+=siz - i0; }
-        res.resize(1,k,1,1,0);
-      }
-      }
-      return res;
-    }
-
-    //! Discard neighboring duplicates in the image buffer, along the specified axis.
-    CImg<T>& discard(const char axis=0) {
-      return get_discard(axis).move_to(*this);
-    }
-
-    //! Discard neighboring duplicates in the image buffer, along the specified axis \newinstance.
-    CImg<T> get_discard(const char axis=0) const {
-      CImg<T> res;
-      if (is_empty()) return res;
-      const char _axis = cimg::lowercase(axis);
-      T current = *_data?(T)0:(T)1;
-      int j = 0;
-      res.assign(width(),height(),depth(),spectrum());
-      switch (_axis) {
-      case 'x' : {
-        cimg_forX(*this,i)
-          if ((*this)(i)!=current) { res.draw_image(j++,get_column(i)); current = (*this)(i); }
-        res.resize(j,-100,-100,-100,0);
-      } break;
-      case 'y' : {
-        cimg_forY(*this,i)
-          if ((*this)(0,i)!=current) { res.draw_image(0,j++,get_row(i)); current = (*this)(0,i); }
-        res.resize(-100,j,-100,-100,0);
-      } break;
-      case 'z' : {
-        cimg_forZ(*this,i)
-          if ((*this)(0,0,i)!=current) { res.draw_image(0,0,j++,get_slice(i)); current = (*this)(0,0,i); }
-        res.resize(-100,-100,j,-100,0);
-      } break;
-      case 'c' : {
-        cimg_forC(*this,i)
-          if ((*this)(0,0,0,i)!=current) { res.draw_image(0,0,0,j++,get_channel(i)); current = (*this)(0,0,0,i); }
-        res.resize(-100,-100,-100,j,0);
-      } break;
-      default : {
-        res.unroll('y');
-        cimg_foroff(*this,i)
-          if ((*this)[i]!=current) res[j++] = current = (*this)[i];
-        res.resize(-100,j,-100,-100,0);
-      }
-      }
-      return res;
-    }
-
-    //! Invert endianness of all pixel values.
-    /**
-     **/
-    CImg<T>& invert_endianness() {
-      cimg::invert_endianness(_data,size());
-      return *this;
-    }
-
-    //! Invert endianness of all pixel values \newinstance.
-    CImg<T> get_invert_endianness() const {
-      return (+*this).invert_endianness();
-    }
-
-    //! Fill image with random values in specified range.
-    /**
-       \param val_min Minimal authorized random value.
-       \param val_max Maximal authorized random value.
-       \note Random variables are uniformely distributed in [val_min,val_max].
-     **/
-    CImg<T>& rand(const T& val_min, const T& val_max) {
-      const float delta = (float)val_max - (float)val_min + (cimg::type<T>::is_float()?0:1);
-      if (cimg::type<T>::is_float()) cimg_for(*this,ptrd,T) *ptrd = (T)(val_min + cimg::rand()*delta);
-      else cimg_for(*this,ptrd,T) *ptrd = std::min(val_max,(T)(val_min + cimg::rand()*delta));
-      return *this;
-    }
-
-    //! Fill image with random values in specified range \newinstance.
-    CImg<T> get_rand(const T& val_min, const T& val_max) const {
-      return (+*this).rand(val_min,val_max);
-    }
-
-    //! Round pixel values.
-    /**
-       \param y Rounding precision.
-       \param rounding_type Rounding type. Can be:
-       - \c -1: Backward.
-       - \c 0: Nearest.
-       - \c 1: Forward.
-    **/
-    CImg<T>& round(const double y=1, const int rounding_type=0) {
-      if (y>0)
-        cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=8192))
-        cimg_rof(*this,ptrd,T) *ptrd = cimg::round(*ptrd,y,rounding_type);
-      return *this;
-    }
-
-    //! Round pixel values \newinstance.
-    CImg<T> get_round(const double y=1, const unsigned int rounding_type=0) const {
-      return (+*this).round(y,rounding_type);
-    }
-
-    //! Add random noise to pixel values.
-    /**
-       \param sigma Amplitude of the random additive noise. If \p sigma<0, it stands for a percentage of the
-         global value range.
-       \param noise_type Type of additive noise (can be \p 0=gaussian, \p 1=uniform, \p 2=Salt and Pepper,
-         \p 3=Poisson or \p 4=Rician).
-       \return A reference to the modified image instance.
-       \note
-       - For Poisson noise (\p noise_type=3), parameter \p sigma is ignored, as Poisson noise only depends on
-         the image value itself.
-       - Function \p CImg<T>::get_noise() is also defined. It returns a non-shared modified copy of the image instance.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_noise(40);
-       (img,res.normalize(0,255)).display();
-       \endcode
-       \image html ref_noise.jpg
-    **/
-    CImg<T>& noise(const double sigma, const unsigned int noise_type=0) {
-      if (is_empty()) return *this;
-      const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
-      Tfloat nsigma = (Tfloat)sigma, m = 0, M = 0;
-      if (nsigma==0 && noise_type!=3) return *this;
-      if (nsigma<0 || noise_type==2) m = (Tfloat)min_max(M);
-      if (nsigma<0) nsigma = (Tfloat)(-nsigma*(M-m)/100.0);
-      switch (noise_type) {
-      case 0 : { // Gaussian noise
-        cimg_rof(*this,ptrd,T) {
-          Tfloat val = (Tfloat)(*ptrd + nsigma*cimg::grand());
-          if (val>vmax) val = vmax;
-          if (val<vmin) val = vmin;
-          *ptrd = (T)val;
-        }
-      } break;
-      case 1 : { // Uniform noise
-        cimg_rof(*this,ptrd,T) {
-          Tfloat val = (Tfloat)(*ptrd + nsigma*cimg::rand(-1,1));
-          if (val>vmax) val = vmax;
-          if (val<vmin) val = vmin;
-          *ptrd = (T)val;
-        }
-      } break;
-      case 2 : { // Salt & Pepper noise
-        if (nsigma<0) nsigma = -nsigma;
-        if (M==m) { m = 0; M = cimg::type<T>::is_float()?(Tfloat)1:(Tfloat)cimg::type<T>::max(); }
-        cimg_rof(*this,ptrd,T) if (cimg::rand(100)<nsigma) *ptrd = (T)(cimg::rand()<0.5?M:m);
-      } break;
-      case 3 : { // Poisson Noise
-        cimg_rof(*this,ptrd,T) *ptrd = (T)cimg::prand(*ptrd);
-      } break;
-      case 4 : { // Rice noise
-        const Tfloat sqrt2 = (Tfloat)std::sqrt(2.0);
-        cimg_rof(*this,ptrd,T) {
-          const Tfloat
-            val0 = (Tfloat)*ptrd/sqrt2,
-            re = (Tfloat)(val0 + nsigma*cimg::grand()),
-            im = (Tfloat)(val0 + nsigma*cimg::grand());
-          Tfloat val = cimg::hypot(re,im);
-          if (val>vmax) val = vmax;
-          if (val<vmin) val = vmin;
-          *ptrd = (T)val;
-        }
-      } break;
-      default :
-        throw CImgArgumentException(_cimg_instance
-                                    "noise(): Invalid specified noise type %d "
-                                    "(should be { 0=gaussian | 1=uniform | 2=salt&Pepper | 3=poisson }).",
-                                    cimg_instance,
-                                    noise_type);
-      }
-      return *this;
-    }
-
-    //! Add random noise to pixel values \newinstance.
-    CImg<T> get_noise(const double sigma, const unsigned int noise_type=0) const {
-      return (+*this).noise(sigma,noise_type);
-    }
-
-    //! Linearly normalize pixel values.
-    /**
-       \param min_value Minimum desired value of the resulting image.
-       \param max_value Maximum desired value of the resulting image.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_normalize(160,220);
-       (img,res).display();
-       \endcode
-       \image html ref_normalize2.jpg
-    **/
-    CImg<T>& normalize(const T& min_value, const T& max_value) {
-      if (is_empty()) return *this;
-      const T a = min_value<max_value?min_value:max_value, b = min_value<max_value?max_value:min_value;
-      T m, M = max_min(m);
-      const Tfloat fm = (Tfloat)m, fM = (Tfloat)M;
-      if (m==M) return fill(min_value);
-      if (m!=a || M!=b) cimg_rof(*this,ptrd,T) *ptrd = (T)((*ptrd - fm)/(fM - fm)*(b - a) + a);
-      return *this;
-    }
-
-    //! Linearly normalize pixel values \newinstance.
-    CImg<Tfloat> get_normalize(const T& min_value, const T& max_value) const {
-      return CImg<Tfloat>(*this,false).normalize((Tfloat)min_value,(Tfloat)max_value);
-    }
-
-    //! Normalize multi-valued pixels of the image instance, with respect to their L2-norm.
-    /**
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_normalize();
-       (img,res.normalize(0,255)).display();
-       \endcode
-       \image html ref_normalize.jpg
-    **/
-    CImg<T>& normalize() {
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-      cimg_forYZ(*this,y,z) {
-        T *ptrd = data(0,y,z,0);
-        cimg_forX(*this,x) {
-          const T *ptrs = ptrd;
-          float n = 0;
-          cimg_forC(*this,c) { n+=cimg::sqr((float)*ptrs); ptrs+=whd; }
-          n = (float)std::sqrt(n);
-          T *_ptrd = ptrd++;
-          if (n>0) cimg_forC(*this,c) { *_ptrd = (T)(*_ptrd/n); _ptrd+=whd; }
-          else cimg_forC(*this,c) { *_ptrd = (T)0; _ptrd+=whd; }
-        }
-      }
-      return *this;
-    }
-
-    //! Normalize multi-valued pixels of the image instance, with respect to their L2-norm \newinstance.
-    CImg<Tfloat> get_normalize() const {
-      return CImg<Tfloat>(*this,false).normalize();
-    }
-
-    //! Compute Lp-norm of each multi-valued pixel of the image instance.
-    /**
-       \param norm_type Type of computed vector norm (can be \p -1=Linf, or \p>=0).
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_norm();
-       (img,res.normalize(0,255)).display();
-       \endcode
-       \image html ref_norm.jpg
-    **/
-    CImg<T>& norm(const int norm_type=2) {
-      if (_spectrum==1 && norm_type) return abs();
-      return get_norm(norm_type).move_to(*this);
-    }
-
-    //! Compute L2-norm of each multi-valued pixel of the image instance \newinstance.
-    CImg<Tfloat> get_norm(const int norm_type=2) const {
-      if (is_empty()) return *this;
-      if (_spectrum==1 && norm_type) return get_abs();
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      CImg<Tfloat> res(_width,_height,_depth);
-      switch (norm_type) {
-      case -1 : { // Linf-norm.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-        cimg_forYZ(*this,y,z) {
-          const ulongT off = (ulongT)offset(0,y,z);
-          const T *ptrs = _data + off;
-          Tfloat *ptrd = res._data + off;
-          cimg_forX(*this,x) {
-            Tfloat n = 0;
-            const T *_ptrs = ptrs++;
-            cimg_forC(*this,c) { const Tfloat val = (Tfloat)cimg::abs(*_ptrs); if (val>n) n = val; _ptrs+=whd; }
-            *(ptrd++) = n;
-          }
-        }
-      } break;
-      case 0 : { // L0-norm.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-        cimg_forYZ(*this,y,z) {
-          const ulongT off = (ulongT)offset(0,y,z);
-          const T *ptrs = _data + off;
-          Tfloat *ptrd = res._data + off;
-          cimg_forX(*this,x) {
-            unsigned int n = 0;
-            const T *_ptrs = ptrs++;
-            cimg_forC(*this,c) { n+=*_ptrs==0?0:1; _ptrs+=whd; }
-            *(ptrd++) = (Tfloat)n;
-          }
-        }
-      } break;
-      case 1 : { // L1-norm.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-        cimg_forYZ(*this,y,z) {
-          const ulongT off = (ulongT)offset(0,y,z);
-          const T *ptrs = _data + off;
-          Tfloat *ptrd = res._data + off;
-          cimg_forX(*this,x) {
-            Tfloat n = 0;
-            const T *_ptrs = ptrs++;
-            cimg_forC(*this,c) { n+=cimg::abs(*_ptrs); _ptrs+=whd; }
-            *(ptrd++) = n;
-          }
-        }
-      } break;
-      case 2 : { // L2-norm.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-        cimg_forYZ(*this,y,z) {
-          const ulongT off = (ulongT)offset(0,y,z);
-          const T *ptrs = _data + off;
-          Tfloat *ptrd = res._data + off;
-          cimg_forX(*this,x) {
-            Tfloat n = 0;
-            const T *_ptrs = ptrs++;
-            cimg_forC(*this,c) { n+=cimg::sqr((Tfloat)*_ptrs); _ptrs+=whd; }
-            *(ptrd++) = (Tfloat)std::sqrt((Tfloat)n);
-          }
-        }
-      } break;
-      default : { // Linf-norm.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16))
-        cimg_forYZ(*this,y,z) {
-          const ulongT off = (ulongT)offset(0,y,z);
-          const T *ptrs = _data + off;
-          Tfloat *ptrd = res._data + off;
-          cimg_forX(*this,x) {
-            Tfloat n = 0;
-            const T *_ptrs = ptrs++;
-            cimg_forC(*this,c) { n+=std::pow(cimg::abs((Tfloat)*_ptrs),(Tfloat)norm_type); _ptrs+=whd; }
-            *(ptrd++) = (Tfloat)std::pow((Tfloat)n,1/(Tfloat)norm_type);
-          }
-        }
-      }
-      }
-      return res;
-    }
-
-    //! Cut pixel values in specified range.
-    /**
-       \param min_value Minimum desired value of the resulting image.
-       \param max_value Maximum desired value of the resulting image.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_cut(160,220);
-       (img,res).display();
-       \endcode
-       \image html ref_cut.jpg
-    **/
-    CImg<T>& cut(const T& min_value, const T& max_value) {
-      if (is_empty()) return *this;
-      const T a = min_value<max_value?min_value:max_value, b = min_value<max_value?max_value:min_value;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-      cimg_rof(*this,ptrd,T) *ptrd = (*ptrd<a)?a:((*ptrd>b)?b:*ptrd);
-      return *this;
-    }
-
-    //! Cut pixel values in specified range \newinstance.
-    CImg<T> get_cut(const T& min_value, const T& max_value) const {
-      return (+*this).cut(min_value,max_value);
-    }
-
-    //! Uniformly quantize pixel values.
-    /**
-       \param nb_levels Number of quantization levels.
-       \param keep_range Tells if resulting values keep the same range as the original ones.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_quantize(4);
-       (img,res).display();
-       \endcode
-       \image html ref_quantize.jpg
-    **/
-    CImg<T>& quantize(const unsigned int nb_levels, const bool keep_range=true) {
-      if (!nb_levels)
-        throw CImgArgumentException(_cimg_instance
-                                    "quantize(): Invalid quantization request with 0 values.",
-                                    cimg_instance);
-
-      if (is_empty()) return *this;
-      Tfloat m, M = (Tfloat)max_min(m), range = M - m;
-      if (range>0) {
-        if (keep_range)
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-          cimg_rof(*this,ptrd,T) {
-            const unsigned int val = (unsigned int)((*ptrd-m)*nb_levels/range);
-            *ptrd = (T)(m + std::min(val,nb_levels - 1)*range/nb_levels);
-          } else
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-          cimg_rof(*this,ptrd,T) {
-            const unsigned int val = (unsigned int)((*ptrd-m)*nb_levels/range);
-            *ptrd = (T)std::min(val,nb_levels - 1);
-          }
-      }
-      return *this;
-    }
-
-    //! Uniformly quantize pixel values \newinstance.
-    CImg<T> get_quantize(const unsigned int n, const bool keep_range=true) const {
-      return (+*this).quantize(n,keep_range);
-    }
-
-    //! Threshold pixel values.
-    /**
-       \param value Threshold value
-       \param soft_threshold Tells if soft thresholding must be applied (instead of hard one).
-       \param strict_threshold Tells if threshold value is strict.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_threshold(128);
-       (img,res.normalize(0,255)).display();
-       \endcode
-       \image html ref_threshold.jpg
-    **/
-    CImg<T>& threshold(const T& value, const bool soft_threshold=false, const bool strict_threshold=false) {
-      if (is_empty()) return *this;
-      if (strict_threshold) {
-        if (soft_threshold)
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-          cimg_rof(*this,ptrd,T) {
-            const T v = *ptrd;
-            *ptrd = v>value?(T)(v-value):v<-(float)value?(T)(v + value):(T)0;
-          }
-        else
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-          cimg_rof(*this,ptrd,T) *ptrd = *ptrd>value?(T)1:(T)0;
-      } else {
-        if (soft_threshold)
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32768))
-          cimg_rof(*this,ptrd,T) {
-            const T v = *ptrd;
-            *ptrd = v>=value?(T)(v-value):v<=-(float)value?(T)(v + value):(T)0;
-          }
-        else
-          cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=65536))
-          cimg_rof(*this,ptrd,T) *ptrd = *ptrd>=value?(T)1:(T)0;
-      }
-      return *this;
-    }
-
-    //! Threshold pixel values \newinstance.
-    CImg<T> get_threshold(const T& value, const bool soft_threshold=false, const bool strict_threshold=false) const {
-      return (+*this).threshold(value,soft_threshold,strict_threshold);
-    }
-
-    //! Compute the histogram of pixel values.
-    /**
-       \param nb_levels Number of desired histogram levels.
-       \param min_value Minimum pixel value considered for the histogram computation.
-         All pixel values lower than \p min_value will not be counted.
-       \param max_value Maximum pixel value considered for the histogram computation.
-         All pixel values higher than \p max_value will not be counted.
-       \note
-       - The histogram H of an image I is the 1d function where H(x) counts the number of occurences of the value x
-         in the image I.
-       - The resulting histogram is always defined in 1d. Histograms of multi-valued images are not multi-dimensional.
-       \par Example
-       \code
-       const CImg<float> img = CImg<float>("reference.jpg").histogram(256);
-       img.display_graph(0,3);
-       \endcode
-       \image html ref_histogram.jpg
-    **/
-    CImg<T>& histogram(const unsigned int nb_levels, const T& min_value, const T& max_value) {
-      return get_histogram(nb_levels,min_value,max_value).move_to(*this);
-    }
-
-    //! Compute the histogram of pixel values \overloading.
-    CImg<T>& histogram(const unsigned int nb_levels) {
-      return get_histogram(nb_levels).move_to(*this);
-    }
-
-    //! Compute the histogram of pixel values \newinstance.
-    CImg<ulongT> get_histogram(const unsigned int nb_levels, const T& min_value, const T& max_value) const {
-      if (!nb_levels || is_empty()) return CImg<ulongT>();
-      const double
-        vmin = (double)(min_value<max_value?min_value:max_value),
-        vmax = (double)(min_value<max_value?max_value:min_value);
-      CImg<ulongT> res(nb_levels,1,1,1,0);
-      cimg_rof(*this,ptrs,T) {
-        const T val = *ptrs;
-        if (val>=vmin && val<=vmax) ++res[val==vmax?nb_levels - 1:(unsigned int)((val - vmin)*nb_levels/(vmax - vmin))];
-      }
-      return res;
-    }
-
-    //! Compute the histogram of pixel values \newinstance.
-    CImg<ulongT> get_histogram(const unsigned int nb_levels) const {
-      if (!nb_levels || is_empty()) return CImg<ulongT>();
-      T vmax = 0, vmin = min_max(vmax);
-      return get_histogram(nb_levels,vmin,vmax);
-    }
-
-    //! Equalize histogram of pixel values.
-    /**
-       \param nb_levels Number of histogram levels used for the equalization.
-       \param min_value Minimum pixel value considered for the histogram computation.
-         All pixel values lower than \p min_value will not be counted.
-       \param max_value Maximum pixel value considered for the histogram computation.
-         All pixel values higher than \p max_value will not be counted.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), res = img.get_equalize(256);
-       (img,res).display();
-       \endcode
-       \image html ref_equalize.jpg
-    **/
-    CImg<T>& equalize(const unsigned int nb_levels, const T& min_value, const T& max_value) {
-      if (!nb_levels || is_empty()) return *this;
-      const T
-        vmin = min_value<max_value?min_value:max_value,
-        vmax = min_value<max_value?max_value:min_value;
-      CImg<ulongT> hist = get_histogram(nb_levels,vmin,vmax);
-      ulongT cumul = 0;
-      cimg_forX(hist,pos) { cumul+=hist[pos]; hist[pos] = cumul; }
-      if (!cumul) cumul = 1;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=1048576))
-      cimg_rof(*this,ptrd,T) {
-        const int pos = (int)((*ptrd-vmin)*(nb_levels - 1.)/(vmax-vmin));
-        if (pos>=0 && pos<(int)nb_levels) *ptrd = (T)(vmin + (vmax-vmin)*hist[pos]/cumul);
-      }
-      return *this;
-    }
-
-    //! Equalize histogram of pixel values \overloading.
-    CImg<T>& equalize(const unsigned int nb_levels) {
-      if (!nb_levels || is_empty()) return *this;
-      T vmax = 0, vmin = min_max(vmax);
-      return equalize(nb_levels,vmin,vmax);
-    }
-
-    //! Equalize histogram of pixel values \newinstance.
-    CImg<T> get_equalize(const unsigned int nblevels, const T& val_min, const T& val_max) const {
-      return (+*this).equalize(nblevels,val_min,val_max);
-    }
-
-    //! Equalize histogram of pixel values \newinstance.
-    CImg<T> get_equalize(const unsigned int nblevels) const {
-      return (+*this).equalize(nblevels);
-    }
-
-    //! Index multi-valued pixels regarding to a specified colormap.
-    /**
-       \param colormap Multi-valued colormap used as the basis for multi-valued pixel indexing.
-       \param dithering Level of dithering (0=disable, 1=standard level).
-       \param map_indexes Tell if the values of the resulting image are the colormap indices or the colormap vectors.
-       \note
-       - \p img.index(colormap,dithering,1) is equivalent to <tt>img.index(colormap,dithering,0).map(colormap)</tt>.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"), colormap(3,1,1,3, 0,128,255, 0,128,255, 0,128,255);
-       const CImg<float> res = img.get_index(colormap,1,true);
-       (img,res).display();
-       \endcode
-       \image html ref_index.jpg
-    **/
-    template<typename t>
-    CImg<T>& index(const CImg<t>& colormap, const float dithering=1, const bool map_indexes=false) {
-      return get_index(colormap,dithering,map_indexes).move_to(*this);
-    }
-
-    //! Index multi-valued pixels regarding to a specified colormap \newinstance.
-    template<typename t>
-    CImg<typename CImg<t>::Tuint>
-    get_index(const CImg<t>& colormap, const float dithering=1, const bool map_indexes=true) const {
-      if (colormap._spectrum!=_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "index(): Instance and specified colormap (%u,%u,%u,%u,%p) "
-                                    "have incompatible dimensions.",
-                                    cimg_instance,
-                                    colormap._width,colormap._height,colormap._depth,colormap._spectrum,colormap._data);
-
-      typedef typename CImg<t>::Tuint tuint;
-      if (is_empty()) return CImg<tuint>();
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        pwhd = (ulongT)colormap._width*colormap._height*colormap._depth;
-      CImg<tuint> res(_width,_height,_depth,map_indexes?_spectrum:1);
-      tuint *ptrd = res._data;
-      if (dithering>0) { // Dithered versions.
-        const float ndithering = cimg::cut(dithering,0,1)/16;
-        Tfloat valm = 0, valM = (Tfloat)max_min(valm);
-        if (valm==valM && valm>=0 && valM<=255) { valm = 0; valM = 255; }
-        CImg<Tfloat> cache = get_crop(-1,0,0,0,_width,1,0,_spectrum - 1);
-        Tfloat *cache_current = cache.data(1,0,0,0), *cache_next = cache.data(1,1,0,0);
-        const ulongT cwhd = (ulongT)cache._width*cache._height*cache._depth;
-        switch (_spectrum) {
-        case 1 : { // Optimized for scalars.
-          cimg_forYZ(*this,y,z) {
-            if (y<height() - 2) {
-              Tfloat *ptrc0 = cache_next; const T *ptrs0 = data(0,y + 1,z,0);
-              cimg_forX(*this,x) *(ptrc0++) = (Tfloat)*(ptrs0++);
-            }
-            Tfloat *ptrs0 = cache_current, *ptrsn0 = cache_next;
-            cimg_forX(*this,x) {
-              const Tfloat _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0;
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp_end = ptrp0 + pwhd; ptrp0<ptrp_end; ) {
-                const Tfloat pval0 = (Tfloat)*(ptrp0++) - val0, dist = pval0*pval0;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              const Tfloat err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)*ndithering;
-              *ptrs0+=7*err0; *(ptrsn0 - 1)+=3*err0; *(ptrsn0++)+=5*err0; *ptrsn0+=err0;
-              if (map_indexes) *(ptrd++) = (tuint)*ptrmin0; else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-            cimg::swap(cache_current,cache_next);
-          }
-        } break;
-        case 2 : { // Optimized for 2d vectors.
-          tuint *ptrd1 = ptrd + whd;
-          cimg_forYZ(*this,y,z) {
-            if (y<height() - 2) {
-              Tfloat *ptrc0 = cache_next, *ptrc1 = ptrc0 + cwhd;
-              const T *ptrs0 = data(0,y + 1,z,0), *ptrs1 = ptrs0 + whd;
-              cimg_forX(*this,x) { *(ptrc0++) = (Tfloat)*(ptrs0++); *(ptrc1++) = (Tfloat)*(ptrs1++); }
-            }
-            Tfloat
-              *ptrs0 = cache_current, *ptrs1 = ptrs0 + cwhd,
-              *ptrsn0 = cache_next, *ptrsn1 = ptrsn0 + cwhd;
-            cimg_forX(*this,x) {
-              const Tfloat
-                _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0,
-                _val1 = (Tfloat)*ptrs1, val1 = _val1<valm?valm:_val1>valM?valM:_val1;
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp1 = ptrp0 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
-                const Tfloat
-                  pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1,
-                  dist = pval0*pval0 + pval1*pval1;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              const t *const ptrmin1 = ptrmin0 + pwhd;
-              const Tfloat
-                err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)*ndithering,
-                err1 = ((*(ptrs1++)=val1) - (Tfloat)*ptrmin1)*ndithering;
-              *ptrs0+=7*err0; *ptrs1+=7*err1;
-              *(ptrsn0 - 1)+=3*err0; *(ptrsn1 - 1)+=3*err1;
-              *(ptrsn0++)+=5*err0; *(ptrsn1++)+=5*err1;
-              *ptrsn0+=err0; *ptrsn1+=err1;
-              if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*ptrmin1; }
-              else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-            cimg::swap(cache_current,cache_next);
-          }
-        } break;
-        case 3 : { // Optimized for 3d vectors (colors).
-          tuint *ptrd1 = ptrd + whd, *ptrd2 = ptrd1 + whd;
-          cimg_forYZ(*this,y,z) {
-            if (y<height() - 2) {
-              Tfloat *ptrc0 = cache_next, *ptrc1 = ptrc0 + cwhd, *ptrc2 = ptrc1 + cwhd;
-              const T *ptrs0 = data(0,y + 1,z,0), *ptrs1 = ptrs0 + whd, *ptrs2 = ptrs1 + whd;
-              cimg_forX(*this,x) {
-                *(ptrc0++) = (Tfloat)*(ptrs0++); *(ptrc1++) = (Tfloat)*(ptrs1++); *(ptrc2++) = (Tfloat)*(ptrs2++);
-              }
-            }
-            Tfloat
-              *ptrs0 = cache_current, *ptrs1 = ptrs0 + cwhd, *ptrs2 = ptrs1 + cwhd,
-              *ptrsn0 = cache_next, *ptrsn1 = ptrsn0 + cwhd, *ptrsn2 = ptrsn1 + cwhd;
-            cimg_forX(*this,x) {
-              const Tfloat
-                _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0,
-                _val1 = (Tfloat)*ptrs1, val1 = _val1<valm?valm:_val1>valM?valM:_val1,
-                _val2 = (Tfloat)*ptrs2, val2 = _val2<valm?valm:_val2>valM?valM:_val2;
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp1 = ptrp0 + pwhd, *ptrp2 = ptrp1 + pwhd,
-                     *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
-                const Tfloat
-                  pval0 = (Tfloat)*(ptrp0++) - val0,
-                  pval1 = (Tfloat)*(ptrp1++) - val1,
-                  pval2 = (Tfloat)*(ptrp2++) - val2,
-                  dist = pval0*pval0 + pval1*pval1 + pval2*pval2;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              const t *const ptrmin1 = ptrmin0 + pwhd, *const ptrmin2 = ptrmin1 + pwhd;
-              const Tfloat
-                err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)*ndithering,
-                err1 = ((*(ptrs1++)=val1) - (Tfloat)*ptrmin1)*ndithering,
-                err2 = ((*(ptrs2++)=val2) - (Tfloat)*ptrmin2)*ndithering;
-
-              *ptrs0+=7*err0; *ptrs1+=7*err1; *ptrs2+=7*err2;
-              *(ptrsn0 - 1)+=3*err0; *(ptrsn1 - 1)+=3*err1; *(ptrsn2 - 1)+=3*err2;
-              *(ptrsn0++)+=5*err0; *(ptrsn1++)+=5*err1; *(ptrsn2++)+=5*err2;
-              *ptrsn0+=err0; *ptrsn1+=err1; *ptrsn2+=err2;
-
-              if (map_indexes) {
-                *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*ptrmin1; *(ptrd2++) = (tuint)*ptrmin2;
-              } else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-            cimg::swap(cache_current,cache_next);
-          }
-        } break;
-        default : // Generic version
-          cimg_forYZ(*this,y,z) {
-            if (y<height() - 2) {
-              Tfloat *ptrc = cache_next;
-              cimg_forC(*this,c) {
-                Tfloat *_ptrc = ptrc; const T *_ptrs = data(0,y + 1,z,c);
-                cimg_forX(*this,x) *(_ptrc++) = (Tfloat)*(_ptrs++);
-                ptrc+=cwhd;
-              }
-            }
-            Tfloat *ptrs = cache_current, *ptrsn = cache_next;
-            cimg_forX(*this,x) {
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin = colormap._data;
-              for (const t *ptrp = colormap._data, *ptrp_end = ptrp + pwhd; ptrp<ptrp_end; ++ptrp) {
-                Tfloat dist = 0; Tfloat *_ptrs = ptrs; const t *_ptrp = ptrp;
-                cimg_forC(*this,c) {
-                  const Tfloat _val = *_ptrs, val = _val<valm?valm:_val>valM?valM:_val;
-                  dist+=cimg::sqr((*_ptrs=val) - (Tfloat)*_ptrp); _ptrs+=cwhd; _ptrp+=pwhd;
-                }
-                if (dist<distmin) { ptrmin = ptrp; distmin = dist; }
-              }
-              const t *_ptrmin = ptrmin; Tfloat *_ptrs = ptrs++, *_ptrsn = (ptrsn++) - 1;
-              cimg_forC(*this,c) {
-                const Tfloat err = (*(_ptrs++) - (Tfloat)*_ptrmin)*ndithering;
-                *_ptrs+=7*err; *(_ptrsn++)+=3*err; *(_ptrsn++)+=5*err; *_ptrsn+=err;
-                _ptrmin+=pwhd; _ptrs+=cwhd - 1; _ptrsn+=cwhd - 2;
-              }
-              if (map_indexes) {
-                tuint *_ptrd = ptrd++;
-                cimg_forC(*this,c) { *_ptrd = (tuint)*ptrmin; _ptrd+=whd; ptrmin+=pwhd; }
-              }
-              else *(ptrd++) = (tuint)(ptrmin - colormap._data);
-            }
-            cimg::swap(cache_current,cache_next);
-          }
-        }
-      } else { // Non-dithered versions
-        switch (_spectrum) {
-        case 1 : { // Optimized for scalars.
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=64 && _height*_depth>=16 && pwhd>=16))
-          cimg_forYZ(*this,y,z) {
-            tuint *ptrd = res.data(0,y,z);
-            for (const T *ptrs0 = data(0,y,z), *ptrs_end = ptrs0 + _width; ptrs0<ptrs_end; ) {
-              const Tfloat val0 = (Tfloat)*(ptrs0++);
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp_end = ptrp0 + pwhd; ptrp0<ptrp_end; ) {
-                const Tfloat pval0 = (Tfloat)*(ptrp0++) - val0, dist = pval0*pval0;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              if (map_indexes) *(ptrd++) = (tuint)*ptrmin0; else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-          }
-        } break;
-        case 2 : { // Optimized for 2d vectors.
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=64 && _height*_depth>=16 && pwhd>=16))
-          cimg_forYZ(*this,y,z) {
-            tuint *ptrd = res.data(0,y,z), *ptrd1 = ptrd + whd;
-            for (const T *ptrs0 = data(0,y,z), *ptrs1 = ptrs0 + whd, *ptrs_end = ptrs0 + _width; ptrs0<ptrs_end; ) {
-              const Tfloat val0 = (Tfloat)*(ptrs0++), val1 = (Tfloat)*(ptrs1++);
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp1 = ptrp0 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
-                const Tfloat
-                  pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1,
-                  dist = pval0*pval0 + pval1*pval1;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*(ptrmin0 + pwhd); }
-              else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-          }
-        } break;
-        case 3 : { // Optimized for 3d vectors (colors).
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=64 && _height*_depth>=16 && pwhd>=16))
-          cimg_forYZ(*this,y,z) {
-            tuint *ptrd = res.data(0,y,z), *ptrd1 = ptrd + whd, *ptrd2 = ptrd1 + whd;
-            for (const T *ptrs0 = data(0,y,z), *ptrs1 = ptrs0 + whd, *ptrs2 = ptrs1 + whd,
-                   *ptrs_end = ptrs0 + _width; ptrs0<ptrs_end; ) {
-              const Tfloat val0 = (Tfloat)*(ptrs0++), val1 = (Tfloat)*(ptrs1++), val2 = (Tfloat)*(ptrs2++);
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = colormap._data;
-              for (const t *ptrp0 = colormap._data, *ptrp1 = ptrp0 + pwhd, *ptrp2 = ptrp1 + pwhd,
-                     *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
-                const Tfloat
-                  pval0 = (Tfloat)*(ptrp0++) - val0,
-                  pval1 = (Tfloat)*(ptrp1++) - val1,
-                  pval2 = (Tfloat)*(ptrp2++) - val2,
-                  dist = pval0*pval0 + pval1*pval1 + pval2*pval2;
-                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
-              }
-              if (map_indexes) {
-                *(ptrd++) = (tuint)*ptrmin0;
-                *(ptrd1++) = (tuint)*(ptrmin0 + pwhd);
-                *(ptrd2++) = (tuint)*(ptrmin0 + 2*pwhd);
-              } else *(ptrd++) = (tuint)(ptrmin0 - colormap._data);
-            }
-          }
-        } break;
-        default : // Generic version.
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=64 && _height*_depth>=16 && pwhd>=16))
-          cimg_forYZ(*this,y,z) {
-            tuint *ptrd = res.data(0,y,z);
-            for (const T *ptrs = data(0,y,z), *ptrs_end = ptrs + _width; ptrs<ptrs_end; ++ptrs) {
-              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin = colormap._data;
-              for (const t *ptrp = colormap._data, *ptrp_end = ptrp + pwhd; ptrp<ptrp_end; ++ptrp) {
-                Tfloat dist = 0; const T *_ptrs = ptrs; const t *_ptrp = ptrp;
-                cimg_forC(*this,c) { dist+=cimg::sqr((Tfloat)*_ptrs - (Tfloat)*_ptrp); _ptrs+=whd; _ptrp+=pwhd; }
-                if (dist<distmin) { ptrmin = ptrp; distmin = dist; }
-              }
-              if (map_indexes) {
-                tuint *_ptrd = ptrd++;
-                cimg_forC(*this,c) { *_ptrd = (tuint)*ptrmin; _ptrd+=whd; ptrmin+=pwhd; }
-              }
-              else *(ptrd++) = (tuint)(ptrmin - colormap._data);
-            }
-          }
-        }
-      }
-      return res;
-    }
-
-    //! Map predefined colormap on the scalar (indexed) image instance.
-    /**
-       \param colormap Multi-valued colormap used for mapping the indexes.
-       \param boundary_conditions The border condition type { 0=dirichlet | 1=neumann | 2=periodic | 3=mirror }.
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg"),
-                         colormap1(3,1,1,3, 0,128,255, 0,128,255, 0,128,255),
-                         colormap2(3,1,1,3, 255,0,0, 0,255,0, 0,0,255),
-                         res = img.get_index(colormap1,0).map(colormap2);
-       (img,res).display();
-       \endcode
-       \image html ref_map.jpg
-    **/
-    template<typename t>
-    CImg<T>& map(const CImg<t>& colormap, const unsigned int boundary_conditions=0) {
-      return get_map(colormap,boundary_conditions).move_to(*this);
-    }
-
-    //! Map predefined colormap on the scalar (indexed) image instance \newinstance.
-    template<typename t>
-    CImg<t> get_map(const CImg<t>& colormap, const unsigned int boundary_conditions=0) const {
-      if (_spectrum!=1 && colormap._spectrum!=1)
-        throw CImgArgumentException(_cimg_instance
-                                    "map(): Instance and specified colormap (%u,%u,%u,%u,%p) "
-                                    "have incompatible dimensions.",
-                                    cimg_instance,
-                                    colormap._width,colormap._height,colormap._depth,colormap._spectrum,colormap._data);
-
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        cwhd = (ulongT)colormap._width*colormap._height*colormap._depth,
-        cwhd2 = 2*cwhd;
-      CImg<t> res(_width,_height,_depth,colormap._spectrum==1?_spectrum:colormap._spectrum);
-      switch (colormap._spectrum) {
-
-      case 1 : { // Optimized for scalars
-        const T *ptrs = _data;
-        switch (boundary_conditions) {
-        case 3 : // Mirror
-          cimg_for(res,ptrd,t) {
-            const ulongT ind = ((ulongT)*(ptrs++))%cwhd2;
-            *ptrd = colormap[ind<cwhd?ind:cwhd2 - ind - 1];
-          }
-          break;
-        case 2 : // Periodic
-          cimg_for(res,ptrd,t) {
-            const ulongT ind = (ulongT)*(ptrs++);
-            *ptrd = colormap[ind%cwhd];
-          } break;
-        case 1 : // Neumann
-          cimg_for(res,ptrd,t) {
-            const longT ind = (longT)*(ptrs++);
-            *ptrd = colormap[cimg::cut(ind,(longT)0,(longT)cwhd - 1)];
-          } break;
-        default : // Dirichlet
-          cimg_for(res,ptrd,t) {
-            const ulongT ind = (ulongT)*(ptrs++);
-            *ptrd = ind<cwhd?colormap[ind]:(t)0;
-          }
-        }
-      } break;
-
-      case 2 : { // Optimized for 2d vectors.
-        const t *const ptrp0 = colormap._data, *ptrp1 = ptrp0 + cwhd;
-        t *ptrd0 = res._data, *ptrd1 = ptrd0 + whd;
-        switch (boundary_conditions) {
-        case 3 : // Mirror
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT
-              _ind = ((ulongT)*(ptrs++))%cwhd2,
-              ind = _ind<cwhd?_ind:cwhd2 - _ind - 1;
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind];
-          }
-          break;
-        case 2 : // Periodic
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = ((ulongT)*(ptrs++))%cwhd;
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind];
-          }
-          break;
-        case 1 : // Neumann
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const longT ind = cimg::cut((longT)*(ptrs++),(longT)0,(longT)cwhd - 1);
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind];
-          }
-          break;
-        default : // Dirichlet
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = (ulongT)*(ptrs++);
-            const bool is_in = ind<cwhd;
-            *(ptrd0++) = is_in?ptrp0[ind]:(t)0; *(ptrd1++) = is_in?ptrp1[ind]:(t)0;
-          }
-        }
-      } break;
-
-      case 3 : { // Optimized for 3d vectors (colors).
-        const t *const ptrp0 = colormap._data, *ptrp1 = ptrp0 + cwhd, *ptrp2 = ptrp1 + cwhd;
-        t *ptrd0 = res._data, *ptrd1 = ptrd0 + whd, *ptrd2 = ptrd1 + whd;
-        switch (boundary_conditions) {
-        case 3 : // Mirror
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT
-              _ind = ((ulongT)*(ptrs++))%cwhd2,
-              ind = _ind<cwhd?_ind:cwhd2 - _ind - 1;
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind]; *(ptrd2++) = ptrp2[ind];
-          } break;
-        case 2 : // Periodic
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = ((ulongT)*(ptrs++))%cwhd;
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind]; *(ptrd2++) = ptrp2[ind];
-          } break;
-        case 1 : // Neumann
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const longT ind = cimg::cut((longT)*(ptrs++),(longT)0,(longT)cwhd - 1);
-            *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind]; *(ptrd2++) = ptrp2[ind];
-          } break;
-        default : // Dirichlet
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = (ulongT)*(ptrs++);
-            const bool is_in = ind<cwhd;
-            *(ptrd0++) = is_in?ptrp0[ind]:(t)0; *(ptrd1++) = is_in?ptrp1[ind]:(t)0; *(ptrd2++) = is_in?ptrp2[ind]:(t)0;
-          }
-        }
-      } break;
-
-      default : { // Generic version.
-        t *ptrd = res._data;
-        switch (boundary_conditions) {
-        case 3 : // Mirror
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT
-              _ind = ((ulongT)*(ptrs++))%cwhd,
-              ind = _ind<cwhd?_ind:cwhd2 - _ind - 1;
-            const t *ptrp = colormap._data + ind;
-            t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = *ptrp; _ptrd+=whd; ptrp+=cwhd; }
-          } break;
-        case 2 : // Periodic
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = ((ulongT)*(ptrs++))%cwhd;
-            const t *ptrp = colormap._data + ind;
-            t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = *ptrp; _ptrd+=whd; ptrp+=cwhd; }
-          } break;
-        case 1 : // Neumann
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const longT ind = cimg::cut((longT)*(ptrs++),(longT)0,(longT)cwhd - 1);
-            const t *ptrp = colormap._data + ind;
-            t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = *ptrp; _ptrd+=whd; ptrp+=cwhd; }
-          } break;
-        default : // Dirichlet
-          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
-            const ulongT ind = (ulongT)*(ptrs++);
-            const bool is_in = ind<cwhd;
-            if (is_in) {
-              const t *ptrp = colormap._data + ind;
-              t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = *ptrp; _ptrd+=whd; ptrp+=cwhd; }
-            } else {
-              t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = (t)0; _ptrd+=whd; }
-            }
-          }
-        }
-      }
-      }
-      return res;
-    }
-
-    //! Label connected components.
-    /**
-       \param is_high_connectivity Boolean that choose between 4(false)- or 8(true)-connectivity
-       in 2d case, and between 6(false)- or 26(true)-connectivity in 3d case.
-       \param tolerance Tolerance used to determine if two neighboring pixels belong to the same region.
-       \note The algorithm of connected components computation has been primarily done
-       by A. Meijster, according to the publication:
-       'W.H. Hesselink, A. Meijster, C. Bron, "Concurrent Determination of Connected Components.",
-       In: Science of Computer Programming 41 (2001), pp. 173--194'.
-       The submitted code has then been modified to fit CImg coding style and constraints.
-    **/
-    CImg<T>& label(const bool is_high_connectivity=false, const Tfloat tolerance=0) {
-      return get_label(is_high_connectivity,tolerance).move_to(*this);
-    }
-
-    //! Label connected components \newinstance.
-    CImg<ulongT> get_label(const bool is_high_connectivity=false,
-                           const Tfloat tolerance=0) const {
-      if (is_empty()) return CImg<ulongT>();
-
-      // Create neighborhood tables.
-      int dx[13], dy[13], dz[13], nb = 0;
-      dx[nb] = 1; dy[nb] = 0; dz[nb++] = 0;
-      dx[nb] = 0; dy[nb] = 1; dz[nb++] = 0;
-      if (is_high_connectivity) {
-        dx[nb] = 1; dy[nb] = 1; dz[nb++] = 0;
-        dx[nb] = 1; dy[nb] = -1; dz[nb++] = 0;
-      }
-      if (_depth>1) { // 3d version.
-        dx[nb] = 0; dy[nb] = 0; dz[nb++]=1;
-        if (is_high_connectivity) {
-          dx[nb] = 1; dy[nb] = 1; dz[nb++] = -1;
-          dx[nb] = 1; dy[nb] = 0; dz[nb++] = -1;
-          dx[nb] = 1; dy[nb] = -1; dz[nb++] = -1;
-          dx[nb] = 0; dy[nb] = 1; dz[nb++] = -1;
-
-          dx[nb] = 0; dy[nb] = 1; dz[nb++] = 1;
-          dx[nb] = 1; dy[nb] = -1; dz[nb++] = 1;
-          dx[nb] = 1; dy[nb] = 0; dz[nb++] = 1;
-          dx[nb] = 1; dy[nb] = 1; dz[nb++] = 1;
-        }
-      }
-      return _label(nb,dx,dy,dz,tolerance);
-    }
-
-    //! Label connected components \overloading.
-    /**
-       \param connectivity_mask Mask of the neighboring pixels.
-       \param tolerance Tolerance used to determine if two neighboring pixels belong to the same region.
-    **/
-    template<typename t>
-    CImg<T>& label(const CImg<t>& connectivity_mask, const Tfloat tolerance=0) {
-      return get_label(connectivity_mask,tolerance).move_to(*this);
-    }
-
-    //! Label connected components \newinstance.
-    template<typename t>
-    CImg<ulongT> get_label(const CImg<t>& connectivity_mask,
-                           const Tfloat tolerance=0) const {
-      int nb = 0;
-      cimg_for(connectivity_mask,ptr,t) if (*ptr) ++nb;
-      CImg<intT> dx(nb,1,1,1,0), dy(nb,1,1,1,0), dz(nb,1,1,1,0);
-      nb = 0;
-      cimg_forXYZ(connectivity_mask,x,y,z) if ((x || y || z) &&
-                                               connectivity_mask(x,y,z)) {
-        dx[nb] = x; dy[nb] = y; dz[nb++] = z;
-      }
-      return _label(nb,dx,dy,dz,tolerance);
-    }
-
-    CImg<ulongT> _label(const unsigned int nb, const int
-                        *const dx, const int *const dy, const int *const dz,
-                        const Tfloat tolerance) const {
-      CImg<ulongT> res(_width,_height,_depth,_spectrum);
-      cimg_forC(*this,c) {
-        CImg<ulongT> _res = res.get_shared_channel(c);
-
-        // Init label numbers.
-        ulongT *ptr = _res.data();
-        cimg_foroff(_res,p) *(ptr++) = p;
-
-        // For each neighbour-direction, label.
-        for (unsigned int n = 0; n<nb; ++n) {
-          const int _dx = dx[n], _dy = dy[n], _dz = dz[n];
-          if (_dx || _dy || _dz) {
-            const int
-              x0 = _dx<0?-_dx:0,
-              x1 = _dx<0?width():width() - _dx,
-              y0 = _dy<0?-_dy:0,
-              y1 = _dy<0?height():height() - _dy,
-              z0 = _dz<0?-_dz:0,
-              z1 = _dz<0?depth():depth() - _dz;
-            const longT
-              wh = (longT)width()*height(),
-              whd = (longT)width()*height()*depth(),
-              offset = _dz*wh + _dy*width() + _dx;
-            for (longT z = z0, nz = z0 + _dz, pz = z0*wh; z<z1; ++z, ++nz, pz+=wh) {
-              for (longT y = y0, ny = y0 + _dy, py = y0*width() + pz; y<y1; ++y, ++ny, py+=width()) {
-                for (longT x = x0, nx = x0 + _dx, p = x0 + py; x<x1; ++x, ++nx, ++p) {
-                  if ((Tfloat)cimg::abs((*this)(x,y,z,c,wh,whd) - (*this)(nx,ny,nz,c,wh,whd))<=tolerance) {
-                    const longT q = p + offset;
-                    ulongT x, y;
-                    for (x = (ulongT)(p<q?q:p), y = (ulongT)(p<q?p:q); x!=y && _res[x]!=x; ) {
-                      x = _res[x]; if (x<y) cimg::swap(x,y);
-                    }
-                    if (x!=y) _res[x] = (ulongT)y;
-                    for (ulongT _p = (ulongT)p; _p!=y; ) {
-                      const ulongT h = _res[_p];
-                      _res[_p] = (ulongT)y;
-                      _p = h;
-                    }
-                    for (ulongT _q = (ulongT)q; _q!=y; ) {
-                      const ulongT h = _res[_q];
-                      _res[_q] = (ulongT)y;
-                      _q = h;
-                    }
-                  }
-                }
-              }
-            }
-          }
-        }
-
-        // Resolve equivalences.
-        ulongT counter = 0;
-        ptr = _res.data();
-        cimg_foroff(_res,p) { *ptr = *ptr==p?counter++:_res[*ptr]; ++ptr; }
-      }
-      return res;
-    }
-
-    // [internal] Replace possibly malicious characters for commands to be called by system() by their escaped version.
-    CImg<T>& _system_strescape() {
-#define cimg_system_strescape(c,s) case c : if (p!=ptrs) CImg<T>(ptrs,(unsigned int)(p-ptrs),1,1,1,false).\
-      move_to(list); \
-      CImg<T>(s,(unsigned int)std::strlen(s),1,1,1,false).move_to(list); ptrs = p + 1; break
-      CImgList<T> list;
-      const T *ptrs = _data;
-      cimg_for(*this,p,T) switch ((int)*p) {
-        cimg_system_strescape('\\',"\\\\");
-        cimg_system_strescape('\"',"\\\"");
-        cimg_system_strescape('!',"\"\\!\"");
-        cimg_system_strescape('`',"\\`");
-        cimg_system_strescape('$',"\\$");
-      }
-      if (ptrs<end()) CImg<T>(ptrs,(unsigned int)(end()-ptrs),1,1,1,false).move_to(list);
-      return (list>'x').move_to(*this);
-    }
-
-    //@}
-    //---------------------------------
-    //
-    //! \name Color Base Management
-    //@{
-    //---------------------------------
-
-    //! Return colormap \e "default", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_default.jpg
-    **/
-    static const CImg<Tuchar>& default_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        colormap.assign(1,256,1,3);
-        for (unsigned int index = 0, r = 16; r<256; r+=32)
-          for (unsigned int g = 16; g<256; g+=32)
-            for (unsigned int b = 32; b<256; b+=64) {
-              colormap(0,index,0) = (Tuchar)r;
-              colormap(0,index,1) = (Tuchar)g;
-              colormap(0,index++,2) = (Tuchar)b;
-            }
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "HSV", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_hsv.jpg
-    **/
-    static const CImg<Tuchar>& HSV_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        CImg<Tint> tmp(1,256,1,3,1);
-        tmp.get_shared_channel(0).sequence(0,359);
-        colormap = tmp.HSVtoRGB();
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "lines", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_lines.jpg
-    **/
-    static const CImg<Tuchar>& lines_LUT256() {
-      static const unsigned char pal[] = {
-        217,62,88,75,1,237,240,12,56,160,165,116,1,1,204,2,15,248,148,185,133,141,46,246,222,116,16,5,207,226,
-        17,114,247,1,214,53,238,0,95,55,233,235,109,0,17,54,33,0,90,30,3,0,94,27,19,0,68,212,166,130,0,15,7,119,
-        238,2,246,198,0,3,16,10,13,2,25,28,12,6,2,99,18,141,30,4,3,140,12,4,30,233,7,10,0,136,35,160,168,184,20,
-        233,0,1,242,83,90,56,180,44,41,0,6,19,207,5,31,214,4,35,153,180,75,21,76,16,202,218,22,17,2,136,71,74,
-        81,251,244,148,222,17,0,234,24,0,200,16,239,15,225,102,230,186,58,230,110,12,0,7,129,249,22,241,37,219,
-        1,3,254,210,3,212,113,131,197,162,123,252,90,96,209,60,0,17,0,180,249,12,112,165,43,27,229,77,40,195,12,
-        87,1,210,148,47,80,5,9,1,137,2,40,57,205,244,40,8,252,98,0,40,43,206,31,187,0,180,1,69,70,227,131,108,0,
-        223,94,228,35,248,243,4,16,0,34,24,2,9,35,73,91,12,199,51,1,249,12,103,131,20,224,2,70,32,
-        233,1,165,3,8,154,246,233,196,5,0,6,183,227,247,195,208,36,0,0,226,160,210,198,69,153,210,1,23,8,192,2,4,
-        137,1,0,52,2,249,241,129,0,0,234,7,238,71,7,32,15,157,157,252,158,2,250,6,13,30,11,162,0,199,21,11,27,224,
-        4,157,20,181,111,187,218,3,0,11,158,230,196,34,223,22,248,135,254,210,157,219,0,117,239,3,255,4,227,5,247,
-        11,4,3,188,111,11,105,195,2,0,14,1,21,219,192,0,183,191,113,241,1,12,17,248,0,48,7,19,1,254,212,0,239,246,
-        0,23,0,250,165,194,194,17,3,253,0,24,6,0,141,167,221,24,212,2,235,243,0,0,205,1,251,133,204,28,4,6,1,10,
-        141,21,74,12,236,254,228,19,1,0,214,1,186,13,13,6,13,16,27,209,6,216,11,207,251,59,32,9,155,23,19,235,143,
-        116,6,213,6,75,159,23,6,0,228,4,10,245,249,1,7,44,234,4,102,174,0,19,239,103,16,15,18,8,214,22,4,47,244,
-        255,8,0,251,173,1,212,252,250,251,252,6,0,29,29,222,233,246,5,149,0,182,180,13,151,0,203,183,0,35,149,0,
-        235,246,254,78,9,17,203,73,11,195,0,3,5,44,0,0,237,5,106,6,130,16,214,20,168,247,168,4,207,11,5,1,232,251,
-        129,210,116,231,217,223,214,27,45,38,4,177,186,249,7,215,172,16,214,27,249,230,236,2,34,216,217,0,175,30,
-        243,225,244,182,20,212,2,226,21,255,20,0,2,13,62,13,191,14,76,64,20,121,4,118,0,216,1,147,0,2,210,1,215,
-        95,210,236,225,184,46,0,248,24,11,1,9,141,250,243,9,221,233,160,11,147,2,55,8,23,12,253,9,0,54,0,231,6,3,
-        141,8,2,246,9,180,5,11,8,227,8,43,110,242,1,130,5,97,36,10,6,219,86,133,11,108,6,1,5,244,67,19,28,0,174,
-        154,16,127,149,252,188,196,196,228,244,9,249,0,0,0,37,170,32,250,0,73,255,23,3,224,234,38,195,198,0,255,87,
-        33,221,174,31,3,0,189,228,6,153,14,144,14,108,197,0,9,206,245,254,3,16,253,178,248,0,95,125,8,0,3,168,21,
-        23,168,19,50,240,244,185,0,1,144,10,168,31,82,1,13 };
-      static const CImg<Tuchar> colormap(pal,1,256,1,3,false);
-      return colormap;
-    }
-
-    //! Return colormap \e "hot", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_hot.jpg
-    **/
-    static const CImg<Tuchar>& hot_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        colormap.assign(1,4,1,3,(T)0);
-        colormap[1] = colormap[2] = colormap[3] = colormap[6] = colormap[7] = colormap[11] = 255;
-        colormap.resize(1,256,1,3,3);
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "cool", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_cool.jpg
-    **/
-    static const CImg<Tuchar>& cool_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) colormap.assign(1,2,1,3).fill((T)0,(T)255,(T)255,(T)0,(T)255,(T)255).resize(1,256,1,3,3);
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "jet", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_jet.jpg
-    **/
-    static const CImg<Tuchar>& jet_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        colormap.assign(1,4,1,3,(T)0);
-        colormap[2] = colormap[3] = colormap[5] = colormap[6] = colormap[8] = colormap[9] = 255;
-        colormap.resize(1,256,1,3,3);
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "flag", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_flag.jpg
-    **/
-    static const CImg<Tuchar>& flag_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        colormap.assign(1,4,1,3,(T)0);
-        colormap[0] = colormap[1] = colormap[5] = colormap[9] = colormap[10] = 255;
-        colormap.resize(1,256,1,3,0,2);
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Return colormap \e "cube", containing 256 colors entries in RGB.
-    /**
-       \return The following \c 256x1x1x3 colormap is returned:
-       \image html ref_colormap_cube.jpg
-    **/
-    static const CImg<Tuchar>& cube_LUT256() {
-      static CImg<Tuchar> colormap;
-      cimg::mutex(8);
-      if (!colormap) {
-        colormap.assign(1,8,1,3,(T)0);
-        colormap[1] = colormap[3] = colormap[5] = colormap[7] =
-          colormap[10] = colormap[11] = colormap[12] = colormap[13] =
-          colormap[20] = colormap[21] = colormap[22] = colormap[23] = 255;
-        colormap.resize(1,256,1,3,3);
-      }
-      cimg::mutex(8,0);
-      return colormap;
-    }
-
-    //! Convert pixel values from sRGB to RGB color spaces.
-    CImg<T>& sRGBtoRGB() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32))
-      cimg_rof(*this,ptr,T) {
-        const Tfloat
-          sval = (Tfloat)*ptr/255,
-          val = (Tfloat)(sval<=0.04045f?sval/12.92f:std::pow((sval + 0.055f)/(1.055f),2.4f));
-        *ptr = (T)cimg::cut(val*255,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from sRGB to RGB color spaces \newinstance.
-    CImg<Tfloat> get_sRGBtoRGB() const {
-      return CImg<Tfloat>(*this,false).sRGBtoRGB();
-    }
-
-    //! Convert pixel values from RGB to sRGB color spaces.
-    CImg<T>& RGBtosRGB() {
-      if (is_empty()) return *this;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(size()>=32))
-      cimg_rof(*this,ptr,T) {
-        const Tfloat
-          val = (Tfloat)*ptr/255,
-          sval = (Tfloat)(val<=0.0031308f?val*12.92f:1.055f*std::pow(val,0.416667f) - 0.055f);
-        *ptr = (T)cimg::cut(sval*255,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to sRGB color spaces \newinstance.
-    CImg<Tfloat> get_RGBtosRGB() const {
-      return CImg<Tfloat>(*this,false).RGBtosRGB();
-    }
-
-    //! Convert pixel values from RGB to HSI color spaces.
-    CImg<T>& RGBtoHSI() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoHSI(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N],
-          G = (Tfloat)p2[N],
-          B = (Tfloat)p3[N],
-          theta = (Tfloat)(std::acos(0.5f*((R - G) + (R - B))/
-                                     std::sqrt(cimg::sqr(R - G) + (R - B)*(G - B)))*180/cimg::PI),
-          m = cimg::min(R,G,B),
-          sum = R + G + B;
-        Tfloat H = 0, S = 0, I = 0;
-        if (theta>0) H = B<=G?theta:360 - theta;
-        if (sum>0) S = 1 - 3*m/sum;
-        I = sum/(3*255);
-        p1[N] = (T)cimg::cut(H,0,360);
-        p2[N] = (T)cimg::cut(S,0,1);
-        p3[N] = (T)cimg::cut(I,0,1);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to HSI color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoHSI() const {
-      return CImg<Tfloat>(*this,false).RGBtoHSI();
-    }
-
-    //! Convert pixel values from HSI to RGB color spaces.
-    CImg<T>& HSItoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "HSItoRGB(): Instance is not a HSI image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        Tfloat
-          H = cimg::mod((Tfloat)p1[N],(Tfloat)360),
-          S = (Tfloat)p2[N],
-          I = (Tfloat)p3[N],
-          a = I*(1 - S),
-          R = 0, G = 0, B = 0;
-        if (H<120) {
-          B = a;
-          R = (Tfloat)(I*(1 + S*std::cos(H*cimg::PI/180)/std::cos((60 - H)*cimg::PI/180)));
-          G = 3*I - (R + B);
-        } else if (H<240) {
-          H-=120;
-          R = a;
-          G = (Tfloat)(I*(1 + S*std::cos(H*cimg::PI/180)/std::cos((60 - H)*cimg::PI/180)));
-          B = 3*I - (R + G);
-        } else {
-          H-=240;
-          G = a;
-          B = (Tfloat)(I*(1 + S*std::cos(H*cimg::PI/180)/std::cos((60 - H)*cimg::PI/180)));
-          R = 3*I - (G + B);
-        }
-        p1[N] = (T)cimg::cut(R*255,0,255);
-        p2[N] = (T)cimg::cut(G*255,0,255);
-        p3[N] = (T)cimg::cut(B*255,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from HSI to RGB color spaces \newinstance.
-    CImg<Tfloat> get_HSItoRGB() const {
-      return CImg< Tuchar>(*this,false).HSItoRGB();
-    }
-
-    //! Convert pixel values from RGB to HSL color spaces.
-    CImg<T>& RGBtoHSL() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoHSL(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N],
-          G = (Tfloat)p2[N],
-          B = (Tfloat)p3[N],
-          m = cimg::min(R,G,B),
-          M = cimg::max(R,G,B),
-          L = (m + M)/(2*255);
-        Tfloat H = 0, S = 0;
-        if (M==m) H = S = 0;
-        else {
-          const Tfloat
-            f = R==m?G - B:G==m?B - R:R - G,
-            i = R==m?3:G==m?5:1;
-          H = i - f/(M - m);
-          if (H>=6) H-=6;
-          H*=60;
-          S = 2*L<=1?(M - m)/(M + m):(M - m)/(2*255 - M - m);
-        }
-        p1[N] = (T)cimg::cut(H,0,360);
-        p2[N] = (T)cimg::cut(S,0,1);
-        p3[N] = (T)cimg::cut(L,0,1);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to HSL color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoHSL() const {
-      return CImg<Tfloat>(*this,false).RGBtoHSL();
-    }
-
-    //! Convert pixel values from HSL to RGB color spaces.
-    CImg<T>& HSLtoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "HSLtoRGB(): Instance is not a HSL image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          H = cimg::mod((Tfloat)p1[N],(Tfloat)360),
-          S = (Tfloat)p2[N],
-          L = (Tfloat)p3[N],
-          q = 2*L<1?L*(1 + S):L + S - L*S,
-          p = 2*L - q,
-          h = H/360,
-          tr = h + (Tfloat)1/3,
-          tg = h,
-          tb = h - (Tfloat)1/3,
-          ntr = tr<0?tr + 1:tr>1?tr - 1:(Tfloat)tr,
-          ntg = tg<0?tg + 1:tg>1?tg - 1:(Tfloat)tg,
-          ntb = tb<0?tb + 1:tb>1?tb - 1:(Tfloat)tb,
-          R = 6*ntr<1?p + (q - p)*6*ntr:2*ntr<1?q:3*ntr<2?p + (q - p)*6*(2.0f/3 - ntr):p,
-          G = 6*ntg<1?p + (q - p)*6*ntg:2*ntg<1?q:3*ntg<2?p + (q - p)*6*(2.0f/3 - ntg):p,
-          B = 6*ntb<1?p + (q - p)*6*ntb:2*ntb<1?q:3*ntb<2?p + (q - p)*6*(2.0f/3 - ntb):p;
-        p1[N] = (T)cimg::cut(255*R,0,255);
-        p2[N] = (T)cimg::cut(255*G,0,255);
-        p3[N] = (T)cimg::cut(255*B,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from HSL to RGB color spaces \newinstance.
-    CImg<Tuchar> get_HSLtoRGB() const {
-      return CImg<Tuchar>(*this,false).HSLtoRGB();
-    }
-
-    //! Convert pixel values from RGB to HSV color spaces.
-    CImg<T>& RGBtoHSV() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoHSV(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N],
-          G = (Tfloat)p2[N],
-          B = (Tfloat)p3[N],
-          m = cimg::min(R,G,B),
-          M = cimg::max(R,G,B);
-        Tfloat H = 0, S = 0;
-        if (M!=m) {
-          const Tfloat
-            f = R==m?G - B:G==m?B - R:R - G,
-            i = R==m?3:G==m?5:1;
-          H = i - f/(M - m);
-          if (H>=6) H-=6;
-          H*=60;
-          S = (M - m)/M;
-        }
-        p1[N] = (T)cimg::cut(H,0,360);
-        p2[N] = (T)cimg::cut(S,0,1);
-        p3[N] = (T)cimg::cut(M/255,0,1);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to HSV color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoHSV() const {
-      return CImg<Tfloat>(*this,false).RGBtoHSV();
-    }
-
-    //! Convert pixel values from HSV to RGB color spaces.
-    CImg<T>& HSVtoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "HSVtoRGB(): Instance is not a HSV image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=256))
-      for (ulongT N = 0; N<whd; ++N) {
-        Tfloat
-          H = cimg::mod((Tfloat)p1[N],(Tfloat)360),
-          S = (Tfloat)p2[N],
-          V = (Tfloat)p3[N],
-          R = 0, G = 0, B = 0;
-        if (H==0 && S==0) R = G = B = V;
-        else {
-          H/=60;
-          const int i = (int)std::floor(H);
-          const Tfloat
-            f = (i&1)?H - i:1 - H + i,
-            m = V*(1 - S),
-            n = V*(1 - S*f);
-          switch (i) {
-          case 6 :
-          case 0 : R = V; G = n; B = m; break;
-          case 1 : R = n; G = V; B = m; break;
-          case 2 : R = m; G = V; B = n; break;
-          case 3 : R = m; G = n; B = V; break;
-          case 4 : R = n; G = m; B = V; break;
-          case 5 : R = V; G = m; B = n; break;
-          }
-        }
-        p1[N] = (T)cimg::cut(R*255,0,255);
-        p2[N] = (T)cimg::cut(G*255,0,255);
-        p3[N] = (T)cimg::cut(B*255,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from HSV to RGB color spaces \newinstance.
-    CImg<Tuchar> get_HSVtoRGB() const {
-      return CImg<Tuchar>(*this,false).HSVtoRGB();
-    }
-
-    //! Convert pixel values from RGB to YCbCr color spaces.
-    CImg<T>& RGBtoYCbCr() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoYCbCr(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=512))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N],
-          G = (Tfloat)p2[N],
-          B = (Tfloat)p3[N],
-          Y = (66*R + 129*G + 25*B + 128)/256 + 16,
-          Cb = (-38*R - 74*G + 112*B + 128)/256 + 128,
-          Cr = (112*R - 94*G - 18*B + 128)/256 + 128;
-        p1[N] = (T)cimg::cut(Y,0,255),
-        p2[N] = (T)cimg::cut(Cb,0,255),
-        p3[N] = (T)cimg::cut(Cr,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to YCbCr color spaces \newinstance.
-    CImg<Tuchar> get_RGBtoYCbCr() const {
-      return CImg<Tuchar>(*this,false).RGBtoYCbCr();
-    }
-
-    //! Convert pixel values from RGB to YCbCr color spaces.
-    CImg<T>& YCbCrtoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "YCbCrtoRGB(): Instance is not a YCbCr image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=512))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          Y = (Tfloat)p1[N] - 16,
-          Cb = (Tfloat)p2[N] - 128,
-          Cr = (Tfloat)p3[N] - 128,
-          R = (298*Y + 409*Cr + 128)/256,
-          G = (298*Y - 100*Cb - 208*Cr + 128)/256,
-          B = (298*Y + 516*Cb + 128)/256;
-        p1[N] = (T)cimg::cut(R,0,255),
-        p2[N] = (T)cimg::cut(G,0,255),
-        p3[N] = (T)cimg::cut(B,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to YCbCr color spaces \newinstance.
-    CImg<Tuchar> get_YCbCrtoRGB() const {
-      return CImg<Tuchar>(*this,false).YCbCrtoRGB();
-    }
-
-    //! Convert pixel values from RGB to YUV color spaces.
-    CImg<T>& RGBtoYUV() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoYUV(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=16384))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N]/255,
-          G = (Tfloat)p2[N]/255,
-          B = (Tfloat)p3[N]/255,
-          Y = 0.299f*R + 0.587f*G + 0.114f*B;
-        p1[N] = (T)Y;
-        p2[N] = (T)(0.492f*(B - Y));
-        p3[N] = (T)(0.877*(R - Y));
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to YUV color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoYUV() const {
-      return CImg<Tfloat>(*this,false).RGBtoYUV();
-    }
-
-    //! Convert pixel values from YUV to RGB color spaces.
-    CImg<T>& YUVtoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "YUVtoRGB(): Instance is not a YUV image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=16384))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          Y = (Tfloat)p1[N],
-          U = (Tfloat)p2[N],
-          V = (Tfloat)p3[N],
-          R = (Y + 1.140f*V)*255,
-          G = (Y - 0.395f*U - 0.581f*V)*255,
-          B = (Y + 2.032f*U)*255;
-        p1[N] = (T)cimg::cut(R,0,255),
-        p2[N] = (T)cimg::cut(G,0,255),
-        p3[N] = (T)cimg::cut(B,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from YUV to RGB color spaces \newinstance.
-    CImg<Tuchar> get_YUVtoRGB() const {
-      return CImg< Tuchar>(*this,false).YUVtoRGB();
-    }
-
-    //! Convert pixel values from RGB to CMY color spaces.
-    CImg<T>& RGBtoCMY() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoCMY(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=2048))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N],
-          G = (Tfloat)p2[N],
-          B = (Tfloat)p3[N],
-          C = 255 - R,
-          M = 255 - G,
-          Y = 255 - B;
-        p1[N] = (T)cimg::cut(C,0,255),
-        p2[N] = (T)cimg::cut(M,0,255),
-        p3[N] = (T)cimg::cut(Y,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to CMY color spaces \newinstance.
-    CImg<Tuchar> get_RGBtoCMY() const {
-      return CImg<Tfloat>(*this,false).RGBtoCMY();
-    }
-
-    //! Convert pixel values from CMY to RGB color spaces.
-    CImg<T>& CMYtoRGB() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "CMYtoRGB(): Instance is not a CMY image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=2048))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          C = (Tfloat)p1[N],
-          M = (Tfloat)p2[N],
-          Y = (Tfloat)p3[N],
-          R = 255 - C,
-          G = 255 - M,
-          B = 255 - Y;
-        p1[N] = (T)cimg::cut(R,0,255),
-        p2[N] = (T)cimg::cut(G,0,255),
-        p3[N] = (T)cimg::cut(B,0,255);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from CMY to RGB color spaces \newinstance.
-    CImg<Tuchar> get_CMYtoRGB() const {
-      return CImg<Tuchar>(*this,false).CMYtoRGB();
-    }
-
-    //! Convert pixel values from CMY to CMYK color spaces.
-    CImg<T>& CMYtoCMYK() {
-      return get_CMYtoCMYK().move_to(*this);
-    }
-
-    //! Convert pixel values from CMY to CMYK color spaces \newinstance.
-    CImg<Tuchar> get_CMYtoCMYK() const {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "CMYtoCMYK(): Instance is not a CMY image.",
-                                    cimg_instance);
-
-      CImg<Tfloat> res(_width,_height,_depth,4);
-      const T *ps1 = data(0,0,0,0), *ps2 = data(0,0,0,1), *ps3 = data(0,0,0,2);
-      Tfloat *pd1 = res.data(0,0,0,0), *pd2 = res.data(0,0,0,1), *pd3 = res.data(0,0,0,2), *pd4 = res.data(0,0,0,3);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=1024))
-      for (ulongT N = 0; N<whd; ++N) {
-        Tfloat
-          C = (Tfloat)ps1[N],
-          M = (Tfloat)ps2[N],
-          Y = (Tfloat)ps3[N],
-          K = cimg::min(C,M,Y);
-        if (K>=255) C = M = Y = 0;
-        else { const Tfloat K1 = 255 - K; C = 255*(C - K)/K1; M = 255*(M - K)/K1; Y = 255*(Y - K)/K1; }
-        pd1[N] = (Tfloat)cimg::cut(C,0,255),
-        pd2[N] = (Tfloat)cimg::cut(M,0,255),
-        pd3[N] = (Tfloat)cimg::cut(Y,0,255),
-        pd4[N] = (Tfloat)cimg::cut(K,0,255);
-      }
-      return res;
-    }
-
-    //! Convert pixel values from CMYK to CMY color spaces.
-    CImg<T>& CMYKtoCMY() {
-      return get_CMYKtoCMY().move_to(*this);
-    }
-
-    //! Convert pixel values from CMYK to CMY color spaces \newinstance.
-    CImg<Tfloat> get_CMYKtoCMY() const {
-      if (_spectrum!=4)
-        throw CImgInstanceException(_cimg_instance
-                                    "CMYKtoCMY(): Instance is not a CMYK image.",
-                                    cimg_instance);
-
-      CImg<Tfloat> res(_width,_height,_depth,3);
-      const T *ps1 = data(0,0,0,0), *ps2 = data(0,0,0,1), *ps3 = data(0,0,0,2), *ps4 = data(0,0,0,3);
-      Tfloat *pd1 = res.data(0,0,0,0), *pd2 = res.data(0,0,0,1), *pd3 = res.data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=1024))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          C = (Tfloat)ps1[N],
-          M = (Tfloat)ps2[N],
-          Y = (Tfloat)ps3[N],
-          K = (Tfloat)ps4[N],
-          K1 = 1 - K/255,
-          nC = C*K1 + K,
-          nM = M*K1 + K,
-          nY = Y*K1 + K;
-        pd1[N] = (Tfloat)cimg::cut(nC,0,255),
-        pd2[N] = (Tfloat)cimg::cut(nM,0,255),
-        pd3[N] = (Tfloat)cimg::cut(nY,0,255);
-      }
-      return res;
-    }
-
-    //! Convert pixel values from RGB to XYZ color spaces.
-    /**
-       \param use_D65 Tell to use the D65 illuminant (D50 otherwise).
-    **/
-    CImg<T>& RGBtoXYZ(const bool use_D65=true) {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "RGBtoXYZ(): Instance is not a RGB image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=2048))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          R = (Tfloat)p1[N]/255,
-          G = (Tfloat)p2[N]/255,
-          B = (Tfloat)p3[N]/255;
-        if (use_D65) { // D65
-          p1[N] = (T)(0.4124564*R + 0.3575761*G + 0.1804375*B);
-          p2[N] = (T)(0.2126729*R + 0.7151522*G + 0.0721750*B);
-          p3[N] = (T)(0.0193339*R + 0.1191920*G + 0.9503041*B);
-        } else { // D50
-          p1[N] = (T)(0.43603516*R + 0.38511658*G + 0.14305115*B);
-          p2[N] = (T)(0.22248840*R + 0.71690369*G + 0.06060791*B);
-          p3[N] = (T)(0.01391602*R + 0.09706116*G + 0.71392822*B);
-        }
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from RGB to XYZ color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoXYZ(const bool use_D65=true) const {
-      return CImg<Tfloat>(*this,false).RGBtoXYZ(use_D65);
-    }
-
-    //! Convert pixel values from XYZ to RGB color spaces.
-    /**
-       \param use_D65 Tell to use the D65 illuminant (D50 otherwise).
-    **/
-    CImg<T>& XYZtoRGB(const bool use_D65=true) {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "XYZtoRGB(): Instance is not a XYZ image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=2048))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          X = (Tfloat)p1[N]*255,
-          Y = (Tfloat)p2[N]*255,
-          Z = (Tfloat)p3[N]*255;
-        if (use_D65) {
-          p1[N] = (T)cimg::cut(3.2404542*X - 1.5371385*Y - 0.4985314*Z,0,255);
-          p2[N] = (T)cimg::cut(-0.9692660*X + 1.8760108*Y + 0.0415560*Z,0,255);
-          p3[N] = (T)cimg::cut(0.0556434*X - 0.2040259*Y + 1.0572252*Z,0,255);
-        } else {
-          p1[N] = (T)cimg::cut(3.134274799724*X  - 1.617275708956*Y - 0.490724283042*Z,0,255);
-          p2[N] = (T)cimg::cut(-0.978795575994*X + 1.916161689117*Y + 0.033453331711*Z,0,255);
-          p3[N] = (T)cimg::cut(0.071976988401*X - 0.228984974402*Y + 1.405718224383*Z,0,255);
-        }
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from XYZ to RGB color spaces \newinstance.
-    CImg<Tuchar> get_XYZtoRGB(const bool use_D65=true) const {
-      return CImg<Tuchar>(*this,false).XYZtoRGB(use_D65);
-    }
-
-    //! Convert pixel values from XYZ to Lab color spaces.
-    CImg<T>& XYZtoLab(const bool use_D65=true) {
-#define _cimg_Labf(x) (24389*(x)>216?cimg::cbrt(x):(24389*(x)/27 + 16)/116)
-
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "XYZtoLab(): Instance is not a XYZ image.",
-                                    cimg_instance);
-      const CImg<Tfloat> white = CImg<Tfloat>(1,1,1,3,255).RGBtoXYZ(use_D65);
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=128))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          X = (Tfloat)(p1[N]/white[0]),
-          Y = (Tfloat)(p2[N]/white[1]),
-          Z = (Tfloat)(p3[N]/white[2]),
-          fX = (Tfloat)_cimg_Labf(X),
-          fY = (Tfloat)_cimg_Labf(Y),
-          fZ = (Tfloat)_cimg_Labf(Z);
-        p1[N] = (T)cimg::cut(116*fY - 16,0,100);
-        p2[N] = (T)(500*(fX - fY));
-        p3[N] = (T)(200*(fY - fZ));
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from XYZ to Lab color spaces \newinstance.
-    CImg<Tfloat> get_XYZtoLab(const bool use_D65=true) const {
-      return CImg<Tfloat>(*this,false).XYZtoLab(use_D65);
-    }
-
-    //! Convert pixel values from Lab to XYZ color spaces.
-    CImg<T>& LabtoXYZ(const bool use_D65=true) {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "LabtoXYZ(): Instance is not a Lab image.",
-                                    cimg_instance);
-      const CImg<Tfloat> white = CImg<Tfloat>(1,1,1,3,255).RGBtoXYZ(use_D65);
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=128))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          L = (Tfloat)p1[N],
-          a = (Tfloat)p2[N],
-          b = (Tfloat)p3[N],
-          cY = (L + 16)/116,
-          cZ = cY - b/200,
-          cX = a/500 + cY,
-          X = (Tfloat)(24389*cX>216?cX*cX*cX:(116*cX - 16)*27/24389),
-          Y = (Tfloat)(27*L>216?cY*cY*cY:27*L/24389),
-          Z = (Tfloat)(24389*cZ>216?cZ*cZ*cZ:(116*cZ - 16)*27/24389);
-        p1[N] = (T)(X*white[0]);
-        p2[N] = (T)(Y*white[1]);
-        p3[N] = (T)(Z*white[2]);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from Lab to XYZ color spaces \newinstance.
-    CImg<Tfloat> get_LabtoXYZ(const bool use_D65=true) const {
-      return CImg<Tfloat>(*this,false).LabtoXYZ(use_D65);
-    }
-
-    //! Convert pixel values from XYZ to xyY color spaces.
-    CImg<T>& XYZtoxyY() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "XYZtoxyY(): Instance is not a XYZ image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=4096))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-          X = (Tfloat)p1[N],
-          Y = (Tfloat)p2[N],
-          Z = (Tfloat)p3[N],
-          sum = X + Y + Z,
-          nsum = sum>0?sum:1;
-        p1[N] = (T)(X/nsum);
-        p2[N] = (T)(Y/nsum);
-        p3[N] = (T)Y;
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from XYZ to xyY color spaces \newinstance.
-    CImg<Tfloat> get_XYZtoxyY() const {
-      return CImg<Tfloat>(*this,false).XYZtoxyY();
-    }
-
-    //! Convert pixel values from xyY pixels to XYZ color spaces.
-    CImg<T>& xyYtoXYZ() {
-      if (_spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "xyYtoXYZ(): Instance is not a xyY image.",
-                                    cimg_instance);
-
-      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(whd>=4096))
-      for (ulongT N = 0; N<whd; ++N) {
-        const Tfloat
-         px = (Tfloat)p1[N],
-         py = (Tfloat)p2[N],
-         Y = (Tfloat)p3[N],
-         ny = py>0?py:1;
-        p1[N] = (T)(px*Y/ny);
-        p2[N] = (T)Y;
-        p3[N] = (T)((1 - px - py)*Y/ny);
-      }
-      return *this;
-    }
-
-    //! Convert pixel values from xyY pixels to XYZ color spaces \newinstance.
-    CImg<Tfloat> get_xyYtoXYZ() const {
-      return CImg<Tfloat>(*this,false).xyYtoXYZ();
-    }
-
-    //! Convert pixel values from RGB to Lab color spaces.
-    CImg<T>& RGBtoLab(const bool use_D65=true) {
-      return RGBtoXYZ(use_D65).XYZtoLab(use_D65);
-    }
-
-    //! Convert pixel values from RGB to Lab color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoLab(const bool use_D65=true) const {
-      return CImg<Tfloat>(*this,false).RGBtoLab(use_D65);
-    }
-
-    //! Convert pixel values from Lab to RGB color spaces.
-    CImg<T>& LabtoRGB(const bool use_D65=true) {
-      return LabtoXYZ().XYZtoRGB(use_D65);
-    }
-
-    //! Convert pixel values from Lab to RGB color spaces \newinstance.
-    CImg<Tuchar> get_LabtoRGB(const bool use_D65=true) const {
-      return CImg<Tuchar>(*this,false).LabtoRGB(use_D65);
-    }
-
-    //! Convert pixel values from RGB to xyY color spaces.
-    CImg<T>& RGBtoxyY(const bool use_D65=true) {
-      return RGBtoXYZ(use_D65).XYZtoxyY();
-    }
-
-    //! Convert pixel values from RGB to xyY color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoxyY(const bool use_D65=true) const {
-      return CImg<Tfloat>(*this,false).RGBtoxyY(use_D65);
-    }
-
-    //! Convert pixel values from xyY to RGB color spaces.
-    CImg<T>& xyYtoRGB(const bool use_D65=true) {
-      return xyYtoXYZ().XYZtoRGB(use_D65);
-    }
-
-    //! Convert pixel values from xyY to RGB color spaces \newinstance.
-    CImg<Tuchar> get_xyYtoRGB(const bool use_D65=true) const {
-      return CImg<Tuchar>(*this,false).xyYtoRGB(use_D65);
-    }
-
-    //! Convert pixel values from RGB to CMYK color spaces.
-    CImg<T>& RGBtoCMYK() {
-      return RGBtoCMY().CMYtoCMYK();
-    }
-
-    //! Convert pixel values from RGB to CMYK color spaces \newinstance.
-    CImg<Tfloat> get_RGBtoCMYK() const {
-      return CImg<Tfloat>(*this,false).RGBtoCMYK();
-    }
-
-    //! Convert pixel values from CMYK to RGB color spaces.
-    CImg<T>& CMYKtoRGB() {
-      return CMYKtoCMY().CMYtoRGB();
-    }
-
-    //! Convert pixel values from CMYK to RGB color spaces \newinstance.
-    CImg<Tuchar> get_CMYKtoRGB() const {
-      return CImg<Tuchar>(*this,false).CMYKtoRGB();
-    }
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Geometric / Spatial Manipulation
-    //@{
-    //------------------------------------------
-
-    static float _cimg_lanczos(const float x) {
-      if (x<=-2 || x>=2) return 0;
-      const float a = (float)cimg::PI*x, b = 0.5f*a;
-      return (float)(x?std::sin(a)*std::sin(b)/(a*b):1);
-    }
-
-    //! Resize image to new dimensions.
-    /**
-       \param size_x Number of columns (new size along the X-axis).
-       \param size_y Number of rows (new size along the Y-axis).
-       \param size_z Number of slices (new size along the Z-axis).
-       \param size_c Number of vector-channels (new size along the C-axis).
-       \param interpolation_type Method of interpolation:
-       - -1 = no interpolation: raw memory resizing.
-       - 0 = no interpolation: additional space is filled according to \p boundary_conditions.
-       - 1 = nearest-neighbor interpolation.
-       - 2 = moving average interpolation.
-       - 3 = linear interpolation.
-       - 4 = grid interpolation.
-       - 5 = cubic interpolation.
-       - 6 = lanczos interpolation.
-       \param boundary_conditions Type of boundary conditions used if necessary.
-       \param centering_x Set centering type (only if \p interpolation_type=0).
-       \param centering_y Set centering type (only if \p interpolation_type=0).
-       \param centering_z Set centering type (only if \p interpolation_type=0).
-       \param centering_c Set centering type (only if \p interpolation_type=0).
-       \note If pd[x,y,z,v]<0, it corresponds to a percentage of the original size (the default value is -100).
-    **/
-    CImg<T>& resize(const int size_x, const int size_y=-100,
-                    const int size_z=-100, const int size_c=-100,
-                    const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                    const float centering_x = 0, const float centering_y = 0,
-                    const float centering_z = 0, const float centering_c = 0) {
-      if (!size_x || !size_y || !size_z || !size_c) return assign();
-      const unsigned int
-        _sx = (unsigned int)(size_x<0?-size_x*width()/100:size_x),
-        _sy = (unsigned int)(size_y<0?-size_y*height()/100:size_y),
-        _sz = (unsigned int)(size_z<0?-size_z*depth()/100:size_z),
-        _sc = (unsigned int)(size_c<0?-size_c*spectrum()/100:size_c),
-        sx = _sx?_sx:1, sy = _sy?_sy:1, sz = _sz?_sz:1, sc = _sc?_sc:1;
-      if (sx==_width && sy==_height && sz==_depth && sc==_spectrum) return *this;
-      if (is_empty()) return assign(sx,sy,sz,sc,(T)0);
-      if (interpolation_type==-1 && sx*sy*sz*sc==size()) {
-        _width = sx; _height = sy; _depth = sz; _spectrum = sc;
-        return *this;
-      }
-      return get_resize(sx,sy,sz,sc,interpolation_type,boundary_conditions,
-                        centering_x,centering_y,centering_z,centering_c).move_to(*this);
-    }
-
-    //! Resize image to new dimensions \newinstance.
-    CImg<T> get_resize(const int size_x, const int size_y = -100,
-                       const int size_z = -100, const int size_c = -100,
-                       const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                       const float centering_x = 0, const float centering_y = 0,
-                       const float centering_z = 0, const float centering_c = 0) const {
-      if (centering_x<0 || centering_x>1 || centering_y<0 || centering_y>1 ||
-          centering_z<0 || centering_z>1 || centering_c<0 || centering_c>1)
-        throw CImgArgumentException(_cimg_instance
-                                    "resize(): Specified centering arguments (%g,%g,%g,%g) are outside range [0,1].",
-                                    cimg_instance,
-                                    centering_x,centering_y,centering_z,centering_c);
-
-      if (!size_x || !size_y || !size_z || !size_c) return CImg<T>();
-      const unsigned int
-        sx = std::max(1U,(unsigned int)(size_x>=0?size_x:-size_x*width()/100)),
-        sy = std::max(1U,(unsigned int)(size_y>=0?size_y:-size_y*height()/100)),
-        sz = std::max(1U,(unsigned int)(size_z>=0?size_z:-size_z*depth()/100)),
-        sc = std::max(1U,(unsigned int)(size_c>=0?size_c:-size_c*spectrum()/100));
-      if (sx==_width && sy==_height && sz==_depth && sc==_spectrum) return +*this;
-      if (is_empty()) return CImg<T>(sx,sy,sz,sc,(T)0);
-      CImg<T> res;
-      switch (interpolation_type) {
-
-        // Raw resizing.
-        //
-      case -1 :
-        std::memcpy(res.assign(sx,sy,sz,sc,(T)0)._data,_data,sizeof(T)*std::min(size(),(ulongT)sx*sy*sz*sc));
-        break;
-
-        // No interpolation.
-        //
-      case 0 : {
-        const int
-          xc = (int)(centering_x*((int)sx - width())),
-          yc = (int)(centering_y*((int)sy - height())),
-          zc = (int)(centering_z*((int)sz - depth())),
-          cc = (int)(centering_c*((int)sc - spectrum()));
-
-        switch (boundary_conditions) {
-        case 3 : { // Mirror
-          res.assign(sx,sy,sz,sc);
-          const int w2 = 2*width(), h2 = 2*height(), d2 = 2*depth(), s2 = 2*spectrum();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=65536))
-          cimg_forXYZC(res,x,y,z,c) {
-            const int
-              mx = cimg::mod(x - xc,w2), my = cimg::mod(y - yc,h2),
-              mz = cimg::mod(z - zc,d2), mc = cimg::mod(c - cc,s2);
-            res(x,y,z,c) = (*this)(mx<width()?mx:w2 - mx - 1,
-                                   my<height()?my:h2 - my - 1,
-                                   mz<depth()?mz:d2 - mz - 1,
-                                   mc<spectrum()?mc:s2 - mc - 1);
-          }
-        } break;
-        case 2 : { // Periodic
-          res.assign(sx,sy,sz,sc);
-          const int
-            x0 = ((int)xc%width()) - width(),
-            y0 = ((int)yc%height()) - height(),
-            z0 = ((int)zc%depth()) - depth(),
-            c0 = ((int)cc%spectrum()) - spectrum(),
-            dx = width(), dy = height(), dz = depth(), dc = spectrum();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=65536))
-          for (int c = c0; c<(int)sc; c+=dc)
-            for (int z = z0; z<(int)sz; z+=dz)
-              for (int y = y0; y<(int)sy; y+=dy)
-                for (int x = x0; x<(int)sx; x+=dx)
-                  res.draw_image(x,y,z,c,*this);
-        } break;
-        case 1 : { // Neumann
-          res.assign(sx,sy,sz,sc).draw_image(xc,yc,zc,cc,*this);
-          CImg<T> sprite;
-          if (xc>0) {  // X-backward
-            res.get_crop(xc,yc,zc,cc,xc,yc + height() - 1,zc + depth() - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int x = xc - 1; x>=0; --x) res.draw_image(x,yc,zc,cc,sprite);
-          }
-          if (xc + width()<(int)sx) { // X-forward
-            res.get_crop(xc + width() - 1,yc,zc,cc,xc + width() - 1,yc + height() - 1,
-                         zc + depth() - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int x = xc + width(); x<(int)sx; ++x) res.draw_image(x,yc,zc,cc,sprite);
-          }
-          if (yc>0) {  // Y-backward
-            res.get_crop(0,yc,zc,cc,sx - 1,yc,zc + depth() - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int y = yc - 1; y>=0; --y) res.draw_image(0,y,zc,cc,sprite);
-          }
-          if (yc + height()<(int)sy) { // Y-forward
-            res.get_crop(0,yc + height() - 1,zc,cc,sx - 1,yc + height() - 1,
-                         zc + depth() - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int y = yc + height(); y<(int)sy; ++y) res.draw_image(0,y,zc,cc,sprite);
-          }
-          if (zc>0) {  // Z-backward
-            res.get_crop(0,0,zc,cc,sx - 1,sy - 1,zc,cc + spectrum() - 1).move_to(sprite);
-            for (int z = zc - 1; z>=0; --z) res.draw_image(0,0,z,cc,sprite);
-          }
-          if (zc + depth()<(int)sz) { // Z-forward
-            res.get_crop(0,0,zc  +depth() - 1,cc,sx - 1,sy - 1,zc + depth() - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int z = zc + depth(); z<(int)sz; ++z) res.draw_image(0,0,z,cc,sprite);
-          }
-          if (cc>0) {  // C-backward
-            res.get_crop(0,0,0,cc,sx - 1,sy - 1,sz - 1,cc).move_to(sprite);
-            for (int c = cc - 1; c>=0; --c) res.draw_image(0,0,0,c,sprite);
-          }
-          if (cc + spectrum()<(int)sc) { // C-forward
-            res.get_crop(0,0,0,cc + spectrum() - 1,sx - 1,sy - 1,sz - 1,cc + spectrum() - 1).move_to(sprite);
-            for (int c = cc + spectrum(); c<(int)sc; ++c) res.draw_image(0,0,0,c,sprite);
-          }
-        } break;
-        default : // Dirichlet
-          res.assign(sx,sy,sz,sc,(T)0).draw_image(xc,yc,zc,cc,*this);
-        }
-        break;
-      } break;
-
-        // Nearest neighbor interpolation.
-        //
-      case 1 : {
-        res.assign(sx,sy,sz,sc);
-        CImg<ulongT> off_x(sx), off_y(sy + 1), off_z(sz + 1), off_c(sc + 1);
-        const ulongT
-          wh = (ulongT)_width*_height,
-          whd = (ulongT)_width*_height*_depth,
-          sxy = (ulongT)sx*sy,
-          sxyz = (ulongT)sx*sy*sz;
-        if (sx==_width) off_x.fill(1);
-        else {
-          ulongT *poff_x = off_x._data, curr = 0;
-          cimg_forX(res,x) {
-            const ulongT old = curr;
-            curr = (ulongT)((x + 1.0)*_width/sx);
-            *(poff_x++) = curr - old;
-          }
-        }
-        if (sy==_height) off_y.fill(_width);
-        else {
-          ulongT *poff_y = off_y._data, curr = 0;
-          cimg_forY(res,y) {
-            const ulongT old = curr;
-            curr = (ulongT)((y + 1.0)*_height/sy);
-            *(poff_y++) = _width*(curr - old);
-          }
-          *poff_y = 0;
-        }
-        if (sz==_depth) off_z.fill(wh);
-        else {
-          ulongT *poff_z = off_z._data, curr = 0;
-          cimg_forZ(res,z) {
-            const ulongT old = curr;
-            curr = (ulongT)((z + 1.0)*_depth/sz);
-            *(poff_z++) = wh*(curr - old);
-          }
-          *poff_z = 0;
-        }
-        if (sc==_spectrum) off_c.fill(whd);
-        else {
-          ulongT *poff_c = off_c._data, curr = 0;
-          cimg_forC(res,c) {
-            const ulongT old = curr;
-            curr = (ulongT)((c + 1.0)*_spectrum/sc);
-            *(poff_c++) = whd*(curr - old);
-          }
-          *poff_c = 0;
-        }
-
-        T *ptrd = res._data;
-        const T* ptrc = _data;
-        const ulongT *poff_c = off_c._data;
-        for (unsigned int c = 0; c<sc; ) {
-          const T *ptrz = ptrc;
-          const ulongT *poff_z = off_z._data;
-          for (unsigned int z = 0; z<sz; ) {
-            const T *ptry = ptrz;
-            const ulongT *poff_y = off_y._data;
-            for (unsigned int y = 0; y<sy; ) {
-              const T *ptrx = ptry;
-              const ulongT *poff_x = off_x._data;
-              cimg_forX(res,x) { *(ptrd++) = *ptrx; ptrx+=*(poff_x++); }
-              ++y;
-              ulongT dy = *(poff_y++);
-              for ( ; !dy && y<dy; std::memcpy(ptrd,ptrd - sx,sizeof(T)*sx), ++y, ptrd+=sx, dy = *(poff_y++)) {}
-              ptry+=dy;
-            }
-            ++z;
-            ulongT dz = *(poff_z++);
-            for ( ; !dz && z<dz; std::memcpy(ptrd,ptrd-sxy,sizeof(T)*sxy), ++z, ptrd+=sxy, dz = *(poff_z++)) {}
-            ptrz+=dz;
-          }
-          ++c;
-          ulongT dc = *(poff_c++);
-          for ( ; !dc && c<dc; std::memcpy(ptrd,ptrd-sxyz,sizeof(T)*sxyz), ++c, ptrd+=sxyz, dc = *(poff_c++)) {}
-          ptrc+=dc;
-        }
-      } break;
-
-        // Moving average.
-        //
-      case 2 : {
-        bool instance_first = true;
-        if (sx!=_width) {
-          CImg<Tfloat> tmp(sx,_height,_depth,_spectrum,0);
-          for (unsigned int a = _width*sx, b = _width, c = sx, s = 0, t = 0; a; ) {
-            const unsigned int d = std::min(b,c);
-            a-=d; b-=d; c-=d;
-            cimg_forYZC(tmp,y,z,v) tmp(t,y,z,v)+=(Tfloat)(*this)(s,y,z,v)*d;
-            if (!b) {
-              cimg_forYZC(tmp,y,z,v) tmp(t,y,z,v)/=_width;
-              ++t;
-              b = _width;
-            }
-            if (!c) { ++s; c = sx; }
-          }
-          tmp.move_to(res);
-          instance_first = false;
-        }
-        if (sy!=_height) {
-          CImg<Tfloat> tmp(sx,sy,_depth,_spectrum,0);
-          for (unsigned int a = _height*sy, b = _height, c = sy, s = 0, t = 0; a; ) {
-            const unsigned int d = std::min(b,c);
-            a-=d; b-=d; c-=d;
-            if (instance_first)
-              cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)+=(Tfloat)(*this)(x,s,z,v)*d;
-            else
-              cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)+=(Tfloat)res(x,s,z,v)*d;
-            if (!b) {
-              cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)/=_height;
-              ++t;
-              b = _height;
-            }
-            if (!c) { ++s; c = sy; }
-          }
-          tmp.move_to(res);
-          instance_first = false;
-        }
-        if (sz!=_depth) {
-          CImg<Tfloat> tmp(sx,sy,sz,_spectrum,0);
-          for (unsigned int a = _depth*sz, b = _depth, c = sz, s = 0, t = 0; a; ) {
-            const unsigned int d = std::min(b,c);
-            a-=d; b-=d; c-=d;
-            if (instance_first)
-              cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)+=(Tfloat)(*this)(x,y,s,v)*d;
-            else
-              cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)+=(Tfloat)res(x,y,s,v)*d;
-            if (!b) {
-              cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)/=_depth;
-              ++t;
-              b = _depth;
-            }
-            if (!c) { ++s; c = sz; }
-          }
-          tmp.move_to(res);
-          instance_first = false;
-        }
-        if (sc!=_spectrum) {
-          CImg<Tfloat> tmp(sx,sy,sz,sc,0);
-          for (unsigned int a = _spectrum*sc, b = _spectrum, c = sc, s = 0, t = 0; a; ) {
-            const unsigned int d = std::min(b,c);
-            a-=d; b-=d; c-=d;
-            if (instance_first)
-              cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)+=(Tfloat)(*this)(x,y,z,s)*d;
-            else
-              cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)+=(Tfloat)res(x,y,z,s)*d;
-            if (!b) {
-              cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)/=_spectrum;
-              ++t;
-              b = _spectrum;
-            }
-            if (!c) { ++s; c = sc; }
-          }
-          tmp.move_to(res);
-          instance_first = false;
-        }
-      } break;
-
-        // Linear interpolation.
-        //
-      case 3 : {
-        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
-        CImg<doubleT> foff(off._width);
-        CImg<T> resx, resy, resz, resc;
-        double curr, old;
-
-        if (sx!=_width) {
-          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
-          else if (_width>sx) get_resize(sx,_height,_depth,_spectrum,2).move_to(resx);
-          else {
-            const double fx = (!boundary_conditions && sx>_width)?(sx>1?(_width - 1.0)/(sx - 1):0):
-              (double)_width/sx;
-            resx.assign(sx,_height,_depth,_spectrum);
-            curr = old = 0;
-            unsigned int *poff = off._data;
-            double *pfoff = foff._data;
-            cimg_forX(resx,x) {
-              *(pfoff++) = curr - (unsigned int)curr;
-              old = curr;
-              curr = std::min(width() - 1.0,curr + fx);
-              *(poff++) = (unsigned int)curr - (unsigned int)old;
-            }
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resx.size()>=65536))
-              cimg_forYZC(resx,y,z,c) {
-              const T *ptrs = data(0,y,z,c), *const ptrsmax = ptrs + _width - 1;
-              T *ptrd = resx.data(0,y,z,c);
-              const unsigned int *poff = off._data;
-              const double *pfoff = foff._data;
-              cimg_forX(resx,x) {
-                const double alpha = *(pfoff++);
-                const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs + 1):val1;
-                *(ptrd++) = (T)((1 - alpha)*val1 + alpha*val2);
-                ptrs+=*(poff++);
-              }
-            }
-          }
-        } else resx.assign(*this,true);
-
-        if (sy!=_height) {
-          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
-          else {
-            if (_height>sy) resx.get_resize(sx,sy,_depth,_spectrum,2).move_to(resy);
-            else {
-              const double fy = (!boundary_conditions && sy>_height)?(sy>1?(_height - 1.0)/(sy - 1):0):
-                (double)_height/sy;
-              resy.assign(sx,sy,_depth,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forY(resy,y) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(height() - 1.0,curr + fy);
-                *(poff++) = sx*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resy.size()>=65536))
-              cimg_forXZC(resy,x,z,c) {
-                const T *ptrs = resx.data(x,0,z,c), *const ptrsmax = ptrs + (_height - 1)*sx;
-                T *ptrd = resy.data(x,0,z,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forY(resy,y) {
-                  const double alpha = *(pfoff++);
-                  const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs + sx):val1;
-                  *ptrd = (T)((1 - alpha)*val1 + alpha*val2);
-                  ptrd+=sx;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resx.assign();
-        } else resy.assign(resx,true);
-
-        if (sz!=_depth) {
-          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
-          else {
-            if (_depth>sz) resy.get_resize(sx,sy,sz,_spectrum,2).move_to(resz);
-            else {
-              const double fz = (!boundary_conditions && sz>_depth)?(sz>1?(_depth - 1.0)/(sz - 1):0):
-                (double)_depth/sz;
-              const unsigned int sxy = sx*sy;
-              resz.assign(sx,sy,sz,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forZ(resz,z) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(depth() - 1.0,curr + fz);
-                *(poff++) = sxy*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resz.size()>=65536))
-              cimg_forXYC(resz,x,y,c) {
-                const T *ptrs = resy.data(x,y,0,c), *const ptrsmax = ptrs + (_depth - 1)*sxy;
-                T *ptrd = resz.data(x,y,0,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forZ(resz,z) {
-                  const double alpha = *(pfoff++);
-                  const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs + sxy):val1;
-                  *ptrd = (T)((1 - alpha)*val1 + alpha*val2);
-                  ptrd+=sxy;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resy.assign();
-        } else resz.assign(resy,true);
-
-        if (sc!=_spectrum) {
-          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
-          else {
-            if (_spectrum>sc) resz.get_resize(sx,sy,sz,sc,2).move_to(resc);
-            else {
-              const double fc = (!boundary_conditions && sc>_spectrum)?(sc>1?(_spectrum - 1.0)/(sc - 1):0):
-                (double)_spectrum/sc;
-              const unsigned int sxyz = sx*sy*sz;
-              resc.assign(sx,sy,sz,sc);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forC(resc,c) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(spectrum() - 1.0,curr + fc);
-                *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resc.size()>=65536))
-              cimg_forXYZ(resc,x,y,z) {
-                const T *ptrs = resz.data(x,y,z,0), *const ptrsmax = ptrs + (_spectrum - 1)*sxyz;
-                T *ptrd = resc.data(x,y,z,0);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forC(resc,c) {
-                  const double alpha = *(pfoff++);
-                  const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs + sxyz):val1;
-                  *ptrd = (T)((1 - alpha)*val1 + alpha*val2);
-                  ptrd+=sxyz;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resz.assign();
-        } else resc.assign(resz,true);
-        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
-      } break;
-
-        // Grid interpolation.
-        //
-      case 4 : {
-        CImg<T> resx, resy, resz, resc;
-        if (sx!=_width) {
-          if (sx<_width) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
-          else {
-            resx.assign(sx,_height,_depth,_spectrum,(T)0);
-            const int dx = (int)(2*sx), dy = 2*width();
-            int err = (int)(dy + centering_x*(sx*dy/width() - dy)), xs = 0;
-            cimg_forX(resx,x) if ((err-=dy)<=0) {
-              cimg_forYZC(resx,y,z,c) resx(x,y,z,c) = (*this)(xs,y,z,c);
-              ++xs;
-              err+=dx;
-            }
-          }
-        } else resx.assign(*this,true);
-
-        if (sy!=_height) {
-          if (sy<_height) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
-          else {
-            resy.assign(sx,sy,_depth,_spectrum,(T)0);
-            const int dx = (int)(2*sy), dy = 2*height();
-            int err = (int)(dy + centering_y*(sy*dy/height() - dy)), ys = 0;
-            cimg_forY(resy,y) if ((err-=dy)<=0) {
-              cimg_forXZC(resy,x,z,c) resy(x,y,z,c) = resx(x,ys,z,c);
-              ++ys;
-              err+=dx;
-            }
-          }
-          resx.assign();
-        } else resy.assign(resx,true);
-
-        if (sz!=_depth) {
-          if (sz<_depth) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
-          else {
-            resz.assign(sx,sy,sz,_spectrum,(T)0);
-            const int dx = (int)(2*sz), dy = 2*depth();
-            int err = (int)(dy + centering_z*(sz*dy/depth() - dy)), zs = 0;
-            cimg_forZ(resz,z) if ((err-=dy)<=0) {
-              cimg_forXYC(resz,x,y,c) resz(x,y,z,c) = resy(x,y,zs,c);
-              ++zs;
-              err+=dx;
-            }
-          }
-          resy.assign();
-        } else resz.assign(resy,true);
-
-        if (sc!=_spectrum) {
-          if (sc<_spectrum) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
-          else {
-            resc.assign(sx,sy,sz,sc,(T)0);
-            const int dx = (int)(2*sc), dy = 2*spectrum();
-            int err = (int)(dy + centering_c*(sc*dy/spectrum() - dy)), cs = 0;
-            cimg_forC(resc,c) if ((err-=dy)<=0) {
-              cimg_forXYZ(resc,x,y,z) resc(x,y,z,c) = resz(x,y,z,cs);
-              ++cs;
-              err+=dx;
-            }
-          }
-          resz.assign();
-        } else resc.assign(resz,true);
-
-        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
-      } break;
-
-        // Cubic interpolation.
-        //
-      case 5 : {
-        const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
-        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
-        CImg<doubleT> foff(off._width);
-        CImg<T> resx, resy, resz, resc;
-        double curr, old;
-
-        if (sx!=_width) {
-          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
-          else {
-            if (_width>sx) get_resize(sx,_height,_depth,_spectrum,2).move_to(resx);
-            else {
-              const double fx = (!boundary_conditions && sx>_width)?(sx>1?(_width - 1.0)/(sx - 1):0):
-                (double)_width/sx;
-              resx.assign(sx,_height,_depth,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forX(resx,x) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(width() - 1.0,curr + fx);
-                *(poff++) = (unsigned int)curr - (unsigned int)old;
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resx.size()>=65536))
-              cimg_forYZC(resx,y,z,c) {
-                const T *const ptrs0 = data(0,y,z,c), *ptrs = ptrs0, *const ptrsmax = ptrs + (_width - 2);
-                T *ptrd = resx.data(0,y,z,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forX(resx,x) {
-                  const double
-                    t = *(pfoff++),
-                    val1 = (double)*ptrs,
-                    val0 = ptrs>ptrs0?(double)*(ptrs - 1):val1,
-                    val2 = ptrs<=ptrsmax?(double)*(ptrs + 1):val1,
-                    val3 = ptrs<ptrsmax?(double)*(ptrs + 2):val2,
-                    val = val1 + 0.5f*(t*(-val0 + val2) + t*t*(2*val0 - 5*val1 + 4*val2 - val3) +
-                                       t*t*t*(-val0 + 3*val1 - 3*val2 + val3));
-                  *(ptrd++) = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-        } else resx.assign(*this,true);
-
-        if (sy!=_height) {
-          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
-          else {
-            if (_height>sy) resx.get_resize(sx,sy,_depth,_spectrum,2).move_to(resy);
-            else {
-              const double fy = (!boundary_conditions && sy>_height)?(sy>1?(_height - 1.0)/(sy - 1):0):
-                (double)_height/sy;
-              resy.assign(sx,sy,_depth,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forY(resy,y) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(height() - 1.0,curr + fy);
-                *(poff++) = sx*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resy.size()>=65536))
-              cimg_forXZC(resy,x,z,c) {
-                const T *const ptrs0 = resx.data(x,0,z,c), *ptrs = ptrs0, *const ptrsmax = ptrs + (_height - 2)*sx;
-                T *ptrd = resy.data(x,0,z,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forY(resy,y) {
-                  const double
-                    t = *(pfoff++),
-                    val1 = (double)*ptrs,
-                    val0 = ptrs>ptrs0?(double)*(ptrs - sx):val1,
-                    val2 = ptrs<=ptrsmax?(double)*(ptrs + sx):val1,
-                    val3 = ptrs<ptrsmax?(double)*(ptrs + 2*sx):val2,
-                    val = val1 + 0.5f*(t*(-val0 + val2) + t*t*(2*val0 - 5*val1 + 4*val2 - val3) +
-                                       t*t*t*(-val0 + 3*val1 - 3*val2 + val3));
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sx;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resx.assign();
-        } else resy.assign(resx,true);
-
-        if (sz!=_depth) {
-          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
-          else {
-            if (_depth>sz) resy.get_resize(sx,sy,sz,_spectrum,2).move_to(resz);
-            else {
-              const double fz = (!boundary_conditions && sz>_depth)?(sz>1?(_depth - 1.0)/(sz - 1):0):
-                (double)_depth/sz;
-              const unsigned int sxy = sx*sy;
-              resz.assign(sx,sy,sz,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forZ(resz,z) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(depth() - 1.0,curr + fz);
-                *(poff++) = sxy*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resz.size()>=65536))
-              cimg_forXYC(resz,x,y,c) {
-                const T *const ptrs0 = resy.data(x,y,0,c), *ptrs = ptrs0, *const ptrsmax = ptrs + (_depth - 2)*sxy;
-                T *ptrd = resz.data(x,y,0,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forZ(resz,z) {
-                  const double
-                    t = *(pfoff++),
-                    val1 = (double)*ptrs,
-                    val0 = ptrs>ptrs0?(double)*(ptrs - sxy):val1,
-                    val2 = ptrs<=ptrsmax?(double)*(ptrs + sxy):val1,
-                    val3 = ptrs<ptrsmax?(double)*(ptrs + 2*sxy):val2,
-                    val = val1 + 0.5f*(t*(-val0 + val2) + t*t*(2*val0 - 5*val1 + 4*val2 - val3) +
-                                       t*t*t*(-val0 + 3*val1 - 3*val2 + val3));
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sxy;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resy.assign();
-        } else resz.assign(resy,true);
-
-        if (sc!=_spectrum) {
-          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
-          else {
-            if (_spectrum>sc) resz.get_resize(sx,sy,sz,sc,2).move_to(resc);
-            else {
-              const double fc = (!boundary_conditions && sc>_spectrum)?(sc>1?(_spectrum - 1.0)/(sc - 1):0):
-                (double)_spectrum/sc;
-              const unsigned int sxyz = sx*sy*sz;
-              resc.assign(sx,sy,sz,sc);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forC(resc,c) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(spectrum() - 1.0,curr + fc);
-                *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resc.size()>=65536))
-              cimg_forXYZ(resc,x,y,z) {
-                const T *const ptrs0 = resz.data(x,y,z,0), *ptrs = ptrs0, *const ptrsmax = ptrs + (_spectrum - 2)*sxyz;
-                T *ptrd = resc.data(x,y,z,0);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forC(resc,c) {
-                  const double
-                    t = *(pfoff++),
-                    val1 = (double)*ptrs,
-                    val0 = ptrs>ptrs0?(double)*(ptrs - sxyz):val1,
-                    val2 = ptrs<=ptrsmax?(double)*(ptrs + sxyz):val1,
-                    val3 = ptrs<ptrsmax?(double)*(ptrs + 2*sxyz):val2,
-                    val = val1 + 0.5f*(t*(-val0 + val2) + t*t*(2*val0 - 5*val1 + 4*val2 - val3) +
-                                       t*t*t*(-val0 + 3*val1 - 3*val2 + val3));
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sxyz;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resz.assign();
-        } else resc.assign(resz,true);
-
-        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
-      } break;
-
-        // Lanczos interpolation.
-        //
-      case 6 : {
-        const double vmin = (double)cimg::type<T>::min(), vmax = (double)cimg::type<T>::max();
-        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
-        CImg<doubleT> foff(off._width);
-        CImg<T> resx, resy, resz, resc;
-        double curr, old;
-
-        if (sx!=_width) {
-          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
-          else {
-            if (_width>sx) get_resize(sx,_height,_depth,_spectrum,2).move_to(resx);
-            else {
-              const double fx = (!boundary_conditions && sx>_width)?(sx>1?(_width - 1.0)/(sx - 1):0):
-                (double)_width/sx;
-              resx.assign(sx,_height,_depth,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forX(resx,x) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(width() - 1.0,curr + fx);
-                *(poff++) = (unsigned int)curr - (unsigned int)old;
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resx.size()>=65536))
-              cimg_forYZC(resx,y,z,c) {
-                const T *const ptrs0 = data(0,y,z,c), *ptrs = ptrs0, *const ptrsmin = ptrs0 + 1,
-                  *const ptrsmax = ptrs0 + (_width - 2);
-                T *ptrd = resx.data(0,y,z,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forX(resx,x) {
-                  const double
-                    t = *(pfoff++),
-                    w0 = _cimg_lanczos(t + 2),
-                    w1 = _cimg_lanczos(t + 1),
-                    w2 = _cimg_lanczos(t),
-                    w3 = _cimg_lanczos(t - 1),
-                    w4 = _cimg_lanczos(t - 2),
-                    val2 = (double)*ptrs,
-                    val1 = ptrs>=ptrsmin?(double)*(ptrs - 1):val2,
-                    val0 = ptrs>ptrsmin?(double)*(ptrs - 2):val1,
-                    val3 = ptrs<=ptrsmax?(double)*(ptrs + 1):val2,
-                    val4 = ptrs<ptrsmax?(double)*(ptrs + 2):val3,
-                    val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
-                  *(ptrd++) = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-        } else resx.assign(*this,true);
-
-        if (sy!=_height) {
-          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
-          else {
-            if (_height>sy) resx.get_resize(sx,sy,_depth,_spectrum,2).move_to(resy);
-            else {
-              const double fy = (!boundary_conditions && sy>_height)?(sy>1?(_height - 1.0)/(sy - 1):0):
-                (double)_height/sy;
-              resy.assign(sx,sy,_depth,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forY(resy,y) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(height() - 1.0,curr + fy);
-                *(poff++) = sx*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resy.size()>=65536))
-              cimg_forXZC(resy,x,z,c) {
-                const T *const ptrs0 = resx.data(x,0,z,c), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sx,
-                  *const ptrsmax = ptrs0 + (_height - 2)*sx;
-                T *ptrd = resy.data(x,0,z,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forY(resy,y) {
-                  const double
-                    t = *(pfoff++),
-                    w0 = _cimg_lanczos(t + 2),
-                    w1 = _cimg_lanczos(t + 1),
-                    w2 = _cimg_lanczos(t),
-                    w3 = _cimg_lanczos(t - 1),
-                    w4 = _cimg_lanczos(t - 2),
-                    val2 = (double)*ptrs,
-                    val1 = ptrs>=ptrsmin?(double)*(ptrs - sx):val2,
-                    val0 = ptrs>ptrsmin?(double)*(ptrs - 2*sx):val1,
-                    val3 = ptrs<=ptrsmax?(double)*(ptrs + sx):val2,
-                    val4 = ptrs<ptrsmax?(double)*(ptrs + 2*sx):val3,
-                    val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sx;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resx.assign();
-        } else resy.assign(resx,true);
-
-        if (sz!=_depth) {
-          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
-          else {
-            if (_depth>sz) resy.get_resize(sx,sy,sz,_spectrum,2).move_to(resz);
-            else {
-              const double fz = (!boundary_conditions && sz>_depth)?(sz>1?(_depth - 1.0)/(sz - 1):0):
-                (double)_depth/sz;
-              const unsigned int sxy = sx*sy;
-              resz.assign(sx,sy,sz,_spectrum);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forZ(resz,z) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(depth() - 1.0,curr + fz);
-                *(poff++) = sxy*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resz.size()>=65536))
-              cimg_forXYC(resz,x,y,c) {
-                const T *const ptrs0 = resy.data(x,y,0,c), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sxy,
-                  *const ptrsmax = ptrs0 + (_depth - 2)*sxy;
-                T *ptrd = resz.data(x,y,0,c);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forZ(resz,z) {
-                  const double
-                    t = *(pfoff++),
-                    w0 = _cimg_lanczos(t + 2),
-                    w1 = _cimg_lanczos(t + 1),
-                    w2 = _cimg_lanczos(t),
-                    w3 = _cimg_lanczos(t - 1),
-                    w4 = _cimg_lanczos(t - 2),
-                    val2 = (double)*ptrs,
-                    val1 = ptrs>=ptrsmin?(double)*(ptrs - sxy):val2,
-                    val0 = ptrs>ptrsmin?(double)*(ptrs - 2*sxy):val1,
-                    val3 = ptrs<=ptrsmax?(double)*(ptrs + sxy):val2,
-                    val4 = ptrs<ptrsmax?(double)*(ptrs + 2*sxy):val3,
-                    val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sxy;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resy.assign();
-        } else resz.assign(resy,true);
-
-        if (sc!=_spectrum) {
-          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
-          else {
-            if (_spectrum>sc) resz.get_resize(sx,sy,sz,sc,2).move_to(resc);
-            else {
-              const double fc = (!boundary_conditions && sc>_spectrum)?(sc>1?(_spectrum - 1.0)/(sc - 1):0):
-                (double)_spectrum/sc;
-              const unsigned int sxyz = sx*sy*sz;
-              resc.assign(sx,sy,sz,sc);
-              curr = old = 0;
-              unsigned int *poff = off._data;
-              double *pfoff = foff._data;
-              cimg_forC(resc,c) {
-                *(pfoff++) = curr - (unsigned int)curr;
-                old = curr;
-                curr = std::min(spectrum() - 1.0,curr + fc);
-                *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old);
-              }
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(resc.size()>=65536))
-              cimg_forXYZ(resc,x,y,z) {
-                const T *const ptrs0 = resz.data(x,y,z,0), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sxyz,
-                  *const ptrsmax = ptrs + (_spectrum - 2)*sxyz;
-                T *ptrd = resc.data(x,y,z,0);
-                const unsigned int *poff = off._data;
-                const double *pfoff = foff._data;
-                cimg_forC(resc,c) {
-                  const double
-                    t = *(pfoff++),
-                    w0 = _cimg_lanczos(t + 2),
-                    w1 = _cimg_lanczos(t + 1),
-                    w2 = _cimg_lanczos(t),
-                    w3 = _cimg_lanczos(t - 1),
-                    w4 = _cimg_lanczos(t - 2),
-                    val2 = (double)*ptrs,
-                    val1 = ptrs>=ptrsmin?(double)*(ptrs - sxyz):val2,
-                    val0 = ptrs>ptrsmin?(double)*(ptrs - 2*sxyz):val1,
-                    val3 = ptrs<=ptrsmax?(double)*(ptrs + sxyz):val2,
-                    val4 = ptrs<ptrsmax?(double)*(ptrs + 2*sxyz):val3,
-                    val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
-                  *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
-                  ptrd+=sxyz;
-                  ptrs+=*(poff++);
-                }
-              }
-            }
-          }
-          resz.assign();
-        } else resc.assign(resz,true);
-
-        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
-      } break;
-
-        // Unknow interpolation.
-        //
-      default :
-        throw CImgArgumentException(_cimg_instance
-                                    "resize(): Invalid specified interpolation %d "
-                                    "(should be { -1=raw | 0=none | 1=nearest | 2=average | 3=linear | 4=grid | "
-                                    "5=cubic | 6=lanczos }).",
-                                    cimg_instance,
-                                    interpolation_type);
-      }
-      return res;
-    }
-
-    //! Resize image to dimensions of another image.
-    /**
-       \param src Reference image used for dimensions.
-       \param interpolation_type Interpolation method.
-       \param boundary_conditions Boundary conditions.
-       \param centering_x Set centering type (only if \p interpolation_type=0).
-       \param centering_y Set centering type (only if \p interpolation_type=0).
-       \param centering_z Set centering type (only if \p interpolation_type=0).
-       \param centering_c Set centering type (only if \p interpolation_type=0).
-     **/
-    template<typename t>
-    CImg<T>& resize(const CImg<t>& src,
-                    const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                    const float centering_x = 0, const float centering_y = 0,
-                    const float centering_z = 0, const float centering_c = 0) {
-      return resize(src._width,src._height,src._depth,src._spectrum,interpolation_type,boundary_conditions,
-                    centering_x,centering_y,centering_z,centering_c);
-    }
-
-    //! Resize image to dimensions of another image \newinstance.
-    template<typename t>
-    CImg<T> get_resize(const CImg<t>& src,
-                       const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                       const float centering_x = 0, const float centering_y = 0,
-                       const float centering_z = 0, const float centering_c = 0) const {
-      return get_resize(src._width,src._height,src._depth,src._spectrum,interpolation_type,boundary_conditions,
-                        centering_x,centering_y,centering_z,centering_c);
-    }
-
-    //! Resize image to dimensions of a display window.
-    /**
-       \param disp Reference display window used for dimensions.
-       \param interpolation_type Interpolation method.
-       \param boundary_conditions Boundary conditions.
-       \param centering_x Set centering type (only if \p interpolation_type=0).
-       \param centering_y Set centering type (only if \p interpolation_type=0).
-       \param centering_z Set centering type (only if \p interpolation_type=0).
-       \param centering_c Set centering type (only if \p interpolation_type=0).
-     **/
-    CImg<T>& resize(const CImgDisplay& disp,
-                    const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                    const float centering_x = 0, const float centering_y = 0,
-                    const float centering_z = 0, const float centering_c = 0) {
-      return resize(disp.width(),disp.height(),_depth,_spectrum,interpolation_type,boundary_conditions,
-                    centering_x,centering_y,centering_z,centering_c);
-    }
-
-    //! Resize image to dimensions of a display window \newinstance.
-    CImg<T> get_resize(const CImgDisplay& disp,
-                       const int interpolation_type=1, const unsigned int boundary_conditions=0,
-                       const float centering_x = 0, const float centering_y = 0,
-                       const float centering_z = 0, const float centering_c = 0) const {
-      return get_resize(disp.width(),disp.height(),_depth,_spectrum,interpolation_type,boundary_conditions,
-                        centering_x,centering_y,centering_z,centering_c);
-    }
-
-    //! Resize image to half-size along XY axes, using an optimized filter.
-    CImg<T>& resize_halfXY() {
-      return get_resize_halfXY().move_to(*this);
-    }
-
-    //! Resize image to half-size along XY axes, using an optimized filter \newinstance.
-    CImg<T> get_resize_halfXY() const {
-      if (is_empty()) return *this;
-      static const Tfloat kernel[9] = { 0.07842776544f, 0.1231940459f, 0.07842776544f,
-                                        0.1231940459f,  0.1935127547f, 0.1231940459f,
-                                        0.07842776544f, 0.1231940459f, 0.07842776544f };
-      CImg<T> I(9), res(_width/2,_height/2,_depth,_spectrum);
-      T *ptrd = res._data;
-      cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,T)
-        if (x%2 && y%2) *(ptrd++) = (T)
-                          (I[0]*kernel[0] + I[1]*kernel[1] + I[2]*kernel[2] +
-                           I[3]*kernel[3] + I[4]*kernel[4] + I[5]*kernel[5] +
-                           I[6]*kernel[6] + I[7]*kernel[7] + I[8]*kernel[8]);
-      return res;
-    }
-
-    //! Resize image to double-size, using the Scale2X algorithm.
-    /**
-       \note Use anisotropic upscaling algorithm
-       <a href="http://scale2x.sourceforge.net/algorithm.html">described here</a>.
-    **/
-    CImg<T>& resize_doubleXY() {
-      return get_resize_doubleXY().move_to(*this);
-    }
-
-    //! Resize image to double-size, using the Scale2X algorithm \newinstance.
-    CImg<T> get_resize_doubleXY() const {
-#define _cimg_gs2x_for3(bound,i) \
- for (int i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1; \
-      _n1##i<(int)(bound) || i==--_n1##i; \
-      _p1##i = i++, ++_n1##i, ptrd1+=(res)._width, ptrd2+=(res)._width)
-
-#define _cimg_gs2x_for3x3(img,x,y,z,c,I,T) \
-  _cimg_gs2x_for3((img)._height,y) for (int x = 0, \
-   _p1##x = 0, \
-   _n1##x = (int)( \
-   (I[1] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
-   (I[7] = (T)(img)(0,_n1##y,z,c)),     \
-   1>=(img)._width?(img).width() - 1:1); \
-   (_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x; \
-   I[1] = I[2], \
-   I[3] = I[4], I[4] = I[5], \
-   I[7] = I[8], \
-   _p1##x = x++, ++_n1##x)
-
-      if (is_empty()) return *this;
-      CImg<T> res(_width<<1,_height<<1,_depth,_spectrum);
-      CImg_3x3(I,T);
-      cimg_forZC(*this,z,c) {
-        T
-          *ptrd1 = res.data(0,0,z,c),
-          *ptrd2 = ptrd1 + res._width;
-        _cimg_gs2x_for3x3(*this,x,y,z,c,I,T) {
-          if (Icp!=Icn && Ipc!=Inc) {
-            *(ptrd1++) = Ipc==Icp?Ipc:Icc;
-            *(ptrd1++) = Icp==Inc?Inc:Icc;
-            *(ptrd2++) = Ipc==Icn?Ipc:Icc;
-            *(ptrd2++) = Icn==Inc?Inc:Icc;
-          } else { *(ptrd1++) = Icc; *(ptrd1++) = Icc; *(ptrd2++) = Icc; *(ptrd2++) = Icc; }
-        }
-      }
-      return res;
-    }
-
-    //! Resize image to triple-size, using the Scale3X algorithm.
-    /**
-       \note Use anisotropic upscaling algorithm
-       <a href="http://scale2x.sourceforge.net/algorithm.html">described here</a>.
-    **/
-    CImg<T>& resize_tripleXY() {
-      return get_resize_tripleXY().move_to(*this);
-    }
-
-    //! Resize image to triple-size, using the Scale3X algorithm \newinstance.
-    CImg<T> get_resize_tripleXY() const {
-#define _cimg_gs3x_for3(bound,i) \
- for (int i = 0, _p1##i = 0, \
-      _n1##i = 1>=(bound)?(int)(bound) - 1:1; \
-      _n1##i<(int)(bound) || i==--_n1##i; \
-      _p1##i = i++, ++_n1##i, ptrd1+=2*(res)._width, ptrd2+=2*(res)._width, ptrd3+=2*(res)._width)
-
-#define _cimg_gs3x_for3x3(img,x,y,z,c,I,T) \
-  _cimg_gs3x_for3((img)._height,y) for (int x = 0, \
-   _p1##x = 0, \
-   _n1##x = (int)( \
-   (I[0] = I[1] = (T)(img)(_p1##x,_p1##y,z,c)), \
-   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
-   (I[6] = I[7] = (T)(img)(0,_n1##y,z,c)),      \
-   1>=(img)._width?(img).width() - 1:1); \
-   (_n1##x<(img).width() && ( \
-   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
-   (I[5] = (T)(img)(_n1##x,y,z,c)), \
-   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
-   x==--_n1##x; \
-   I[0] = I[1], I[1] = I[2], \
-   I[3] = I[4], I[4] = I[5], \
-   I[6] = I[7], I[7] = I[8], \
-   _p1##x = x++, ++_n1##x)
-
-      if (is_empty()) return *this;
-      CImg<T> res(3*_width,3*_height,_depth,_spectrum);
-      CImg_3x3(I,T);
-      cimg_forZC(*this,z,c) {
-        T
-          *ptrd1 = res.data(0,0,z,c),
-          *ptrd2 = ptrd1 + res._width,
-          *ptrd3 = ptrd2 + res._width;
-        _cimg_gs3x_for3x3(*this,x,y,z,c,I,T) {
-          if (Icp != Icn && Ipc != Inc) {
-            *(ptrd1++) = Ipc==Icp?Ipc:Icc;
-            *(ptrd1++) = (Ipc==Icp && Icc!=Inp) || (Icp==Inc && Icc!=Ipp)?Icp:Icc;
-            *(ptrd1++) = Icp==Inc?Inc:Icc;
-            *(ptrd2++) = (Ipc==Icp && Icc!=Ipn) || (Ipc==Icn && Icc!=Ipp)?Ipc:Icc;
-            *(ptrd2++) = Icc;
-            *(ptrd2++) = (Icp==Inc && Icc!=Inn) || (Icn==Inc && Icc!=Inp)?Inc:Icc;
-            *(ptrd3++) = Ipc==Icn?Ipc:Icc;
-            *(ptrd3++) = (Ipc==Icn && Icc!=Inn) || (Icn==Inc && Icc!=Ipn)?Icn:Icc;
-            *(ptrd3++) = Icn==Inc?Inc:Icc;
-          } else {
-            *(ptrd1++) = Icc; *(ptrd1++) = Icc; *(ptrd1++) = Icc;
-            *(ptrd2++) = Icc; *(ptrd2++) = Icc; *(ptrd2++) = Icc;
-            *(ptrd3++) = Icc; *(ptrd3++) = Icc; *(ptrd3++) = Icc;
-          }
-        }
-      }
-      return res;
-    }
-
-    //! Mirror image content along specified axis.
-    /**
-       \param axis Mirror axis
-    **/
-    CImg<T>& mirror(const char axis) {
-      if (is_empty()) return *this;
-      T *pf, *pb, *buf = 0;
-      switch (cimg::lowercase(axis)) {
-      case 'x' : {
-        pf = _data; pb = data(_width - 1);
-        const unsigned int width2 = _width/2;
-        for (unsigned int yzv = 0; yzv<_height*_depth*_spectrum; ++yzv) {
-          for (unsigned int x = 0; x<width2; ++x) { const T val = *pf; *(pf++) = *pb; *(pb--) = val; }
-          pf+=_width - width2;
-          pb+=_width + width2;
-        }
-      } break;
-      case 'y' : {
-        buf = new T[_width];
-        pf = _data; pb = data(0,_height - 1);
-        const unsigned int height2 = _height/2;
-        for (unsigned int zv = 0; zv<_depth*_spectrum; ++zv) {
-          for (unsigned int y = 0; y<height2; ++y) {
-            std::memcpy(buf,pf,_width*sizeof(T));
-            std::memcpy(pf,pb,_width*sizeof(T));
-            std::memcpy(pb,buf,_width*sizeof(T));
-            pf+=_width;
-            pb-=_width;
-          }
-          pf+=(ulongT)_width*(_height - height2);
-          pb+=(ulongT)_width*(_height + height2);
-        }
-      } break;
-      case 'z' : {
-        buf = new T[(ulongT)_width*_height];
-        pf = _data; pb = data(0,0,_depth - 1);
-        const unsigned int depth2 = _depth/2;
-        cimg_forC(*this,c) {
-          for (unsigned int z = 0; z<depth2; ++z) {
-            std::memcpy(buf,pf,_width*_height*sizeof(T));
-            std::memcpy(pf,pb,_width*_height*sizeof(T));
-            std::memcpy(pb,buf,_width*_height*sizeof(T));
-            pf+=(ulongT)_width*_height;
-            pb-=(ulongT)_width*_height;
-          }
-          pf+=(ulongT)_width*_height*(_depth - depth2);
-          pb+=(ulongT)_width*_height*(_depth + depth2);
-        }
-      } break;
-      case 'c' : {
-        buf = new T[(ulongT)_width*_height*_depth];
-        pf = _data; pb = data(0,0,0,_spectrum - 1);
-        const unsigned int _spectrum2 = _spectrum/2;
-        for (unsigned int v = 0; v<_spectrum2; ++v) {
-          std::memcpy(buf,pf,_width*_height*_depth*sizeof(T));
-          std::memcpy(pf,pb,_width*_height*_depth*sizeof(T));
-          std::memcpy(pb,buf,_width*_height*_depth*sizeof(T));
-          pf+=(ulongT)_width*_height*_depth;
-          pb-=(ulongT)_width*_height*_depth;
-        }
-      } break;
-      default :
-        throw CImgArgumentException(_cimg_instance
-                                    "mirror(): Invalid specified axis '%c'.",
-                                    cimg_instance,
-                                    axis);
-      }
-      delete[] buf;
-      return *this;
-    }
-
-    //! Mirror image content along specified axis \newinstance.
-    CImg<T> get_mirror(const char axis) const {
-      return (+*this).mirror(axis);
-    }
-
-    //! Mirror image content along specified axes.
-    /**
-       \param axes Mirror axes, as a C-string.
-       \note \c axes may contains multiple characters, e.g. \c "xyz"
-    **/
-    CImg<T>& mirror(const char *const axes) {
-      for (const char *s = axes; *s; ++s) mirror(*s);
-      return *this;
-    }
-
-    //! Mirror image content along specified axes \newinstance.
-    CImg<T> get_mirror(const char *const axes) const {
-      return (+*this).mirror(axes);
-    }
-
-    //! Shift image content.
-    /**
-       \param delta_x Amount of displacement along the X-axis.
-       \param delta_y Amount of displacement along the Y-axis.
-       \param delta_z Amount of displacement along the Z-axis.
-       \param delta_c Amount of displacement along the C-axis.
-       \param boundary_conditions Border condition. Can be { 0=dirichlet | 1=neumann | 2=periodic | 3=mirror }.
-    **/
-    CImg<T>& shift(const int delta_x, const int delta_y=0, const int delta_z=0, const int delta_c=0,
-                   const unsigned int boundary_conditions=0) {
-      if (is_empty()) return *this;
-      if (boundary_conditions==3)
-        return get_crop(-delta_x,-delta_y,-delta_z,-delta_c,
-                        width() - delta_x - 1,
-                        height() - delta_y - 1,
-                        depth() - delta_z - 1,
-                        spectrum() - delta_c - 1,3).move_to(*this);
-      if (delta_x) // Shift along X-axis
-        switch (boundary_conditions) {
-        case 2 : { // Periodic
-          const int ml = cimg::mod(-delta_x,width()), ndelta_x = (ml<=width()/2)?ml:(ml-width());
-          if (!ndelta_x) return *this;
-          CImg<T> buf(cimg::abs(ndelta_x));
-          if (ndelta_x>0) cimg_forYZC(*this,y,z,c) {
-              std::memcpy(buf,data(0,y,z,c),ndelta_x*sizeof(T));
-              std::memmove(data(0,y,z,c),data(ndelta_x,y,z,c),(_width-ndelta_x)*sizeof(T));
-              std::memcpy(data(_width-ndelta_x,y,z,c),buf,ndelta_x*sizeof(T));
-            } else cimg_forYZC(*this,y,z,c) {
-              std::memcpy(buf,data(_width + ndelta_x,y,z,c),-ndelta_x*sizeof(T));
-              std::memmove(data(-ndelta_x,y,z,c),data(0,y,z,c),(_width + ndelta_x)*sizeof(T));
-              std::memcpy(data(0,y,z,c),buf,-ndelta_x*sizeof(T));
-            }
-        } break;
-        case 1 : // Neumann
-          if (delta_x<0) {
-            const int ndelta_x = (-delta_x>=width())?width() - 1:-delta_x;
-            if (!ndelta_x) return *this;
-            cimg_forYZC(*this,y,z,c) {
-              std::memmove(data(0,y,z,c),data(ndelta_x,y,z,c),(_width-ndelta_x)*sizeof(T));
-              T *ptrd = data(_width - 1,y,z,c);
-              const T val = *ptrd;
-              for (int l = 0; l<ndelta_x - 1; ++l) *(--ptrd) = val;
-            }
-          } else {
-            const int ndelta_x = (delta_x>=width())?width() - 1:delta_x;
-            if (!ndelta_x) return *this;
-            cimg_forYZC(*this,y,z,c) {
-              std::memmove(data(ndelta_x,y,z,c),data(0,y,z,c),(_width-ndelta_x)*sizeof(T));
-              T *ptrd = data(0,y,z,c);
-              const T val = *ptrd;
-              for (int l = 0; l<ndelta_x - 1; ++l) *(++ptrd) = val;
-            }
-          }
-          break;
-        default : // Dirichlet
-          if (cimg::abs(delta_x)>=width()) return fill((T)0);
-          if (delta_x<0) cimg_forYZC(*this,y,z,c) {
-              std::memmove(data(0,y,z,c),data(-delta_x,y,z,c),(_width + delta_x)*sizeof(T));
-              std::memset(data(_width + delta_x,y,z,c),0,-delta_x*sizeof(T));
-            } else cimg_forYZC(*this,y,z,c) {
-              std::memmove(data(delta_x,y,z,c),data(0,y,z,c),(_width-delta_x)*sizeof(T));
-              std::memset(data(0,y,z,c),0,delta_x*sizeof(T));
-            }
-        }
-
-      if (delta_y) // Shift along Y-axis
-        switch (boundary_conditions) {
-        case 2 : { // Periodic
-          const int ml = cimg::mod(-delta_y,height()), ndelta_y = (ml<=height()/2)?ml:(ml-height());
-          if (!ndelta_y) return *this;
-          CImg<T> buf(width(),cimg::abs(ndelta_y));
-          if (ndelta_y>0) cimg_forZC(*this,z,c) {
-              std::memcpy(buf,data(0,0,z,c),_width*ndelta_y*sizeof(T));
-              std::memmove(data(0,0,z,c),data(0,ndelta_y,z,c),_width*(_height-ndelta_y)*sizeof(T));
-              std::memcpy(data(0,_height-ndelta_y,z,c),buf,_width*ndelta_y*sizeof(T));
-            } else cimg_forZC(*this,z,c) {
-              std::memcpy(buf,data(0,_height + ndelta_y,z,c),-ndelta_y*_width*sizeof(T));
-              std::memmove(data(0,-ndelta_y,z,c),data(0,0,z,c),_width*(_height + ndelta_y)*sizeof(T));
-              std::memcpy(data(0,0,z,c),buf,-ndelta_y*_width*sizeof(T));
-            }
-        } break;
-        case 1 : // Neumann
-          if (delta_y<0) {
-            const int ndelta_y = (-delta_y>=height())?height() - 1:-delta_y;
-            if (!ndelta_y) return *this;
-            cimg_forZC(*this,z,c) {
-              std::memmove(data(0,0,z,c),data(0,ndelta_y,z,c),_width*(_height-ndelta_y)*sizeof(T));
-              T *ptrd = data(0,_height-ndelta_y,z,c), *ptrs = data(0,_height - 1,z,c);
-              for (int l = 0; l<ndelta_y - 1; ++l) { std::memcpy(ptrd,ptrs,_width*sizeof(T)); ptrd+=_width; }
-            }
-          } else {
-            const int ndelta_y = (delta_y>=height())?height() - 1:delta_y;
-            if (!ndelta_y) return *this;
-            cimg_forZC(*this,z,c) {
-              std::memmove(data(0,ndelta_y,z,c),data(0,0,z,c),_width*(_height-ndelta_y)*sizeof(T));
-              T *ptrd = data(0,1,z,c), *ptrs = data(0,0,z,c);
-              for (int l = 0; l<ndelta_y - 1; ++l) { std::memcpy(ptrd,ptrs,_width*sizeof(T)); ptrd+=_width; }
-            }
-          }
-          break;
-        default : // Dirichlet
-          if (cimg::abs(delta_y)>=height()) return fill((T)0);
-          if (delta_y<0) cimg_forZC(*this,z,c) {
-              std::memmove(data(0,0,z,c),data(0,-delta_y,z,c),_width*(_height + delta_y)*sizeof(T));
-              std::memset(data(0,_height + delta_y,z,c),0,-delta_y*_width*sizeof(T));
-            } else cimg_forZC(*this,z,c) {
-              std::memmove(data(0,delta_y,z,c),data(0,0,z,c),_width*(_height-delta_y)*sizeof(T));
-              std::memset(data(0,0,z,c),0,delta_y*_width*sizeof(T));
-            }
-        }
-
-      if (delta_z) // Shift along Z-axis
-        switch (boundary_conditions) {
-        case 2 : { // Periodic
-          const int ml = cimg::mod(-delta_z,depth()), ndelta_z = (ml<=depth()/2)?ml:(ml-depth());
-          if (!ndelta_z) return *this;
-          CImg<T> buf(width(),height(),cimg::abs(ndelta_z));
-          if (ndelta_z>0) cimg_forC(*this,c) {
-              std::memcpy(buf,data(0,0,0,c),_width*_height*ndelta_z*sizeof(T));
-              std::memmove(data(0,0,0,c),data(0,0,ndelta_z,c),_width*_height*(_depth-ndelta_z)*sizeof(T));
-              std::memcpy(data(0,0,_depth-ndelta_z,c),buf,_width*_height*ndelta_z*sizeof(T));
-            } else cimg_forC(*this,c) {
-              std::memcpy(buf,data(0,0,_depth + ndelta_z,c),-ndelta_z*_width*_height*sizeof(T));
-              std::memmove(data(0,0,-ndelta_z,c),data(0,0,0,c),_width*_height*(_depth + ndelta_z)*sizeof(T));
-              std::memcpy(data(0,0,0,c),buf,-ndelta_z*_width*_height*sizeof(T));
-            }
-        } break;
-        case 1 : // Neumann
-          if (delta_z<0) {
-            const int ndelta_z = (-delta_z>=depth())?depth() - 1:-delta_z;
-            if (!ndelta_z) return *this;
-            cimg_forC(*this,c) {
-              std::memmove(data(0,0,0,c),data(0,0,ndelta_z,c),_width*_height*(_depth-ndelta_z)*sizeof(T));
-              T *ptrd = data(0,0,_depth-ndelta_z,c), *ptrs = data(0,0,_depth - 1,c);
-              for (int l = 0; l<ndelta_z - 1; ++l) {
-                std::memcpy(ptrd,ptrs,_width*_height*sizeof(T)); ptrd+=(ulongT)_width*_height;
-              }
-            }
-          } else {
-            const int ndelta_z = (delta_z>=depth())?depth() - 1:delta_z;
-            if (!ndelta_z) return *this;
-            cimg_forC(*this,c) {
-              std::memmove(data(0,0,ndelta_z,c),data(0,0,0,c),_width*_height*(_depth-ndelta_z)*sizeof(T));
-              T *ptrd = data(0,0,1,c), *ptrs = data(0,0,0,c);
-              for (int l = 0; l<ndelta_z - 1; ++l) {
-                std::memcpy(ptrd,ptrs,_width*_height*sizeof(T)); ptrd+=(ulongT)_width*_height;
-              }
-            }
-          }
-          break;
-        default : // Dirichlet
-          if (cimg::abs(delta_z)>=depth()) return fill((T)0);
-          if (delta_z<0) cimg_forC(*this,c) {
-              std::memmove(data(0,0,0,c),data(0,0,-delta_z,c),_width*_height*(_depth + delta_z)*sizeof(T));
-              std::memset(data(0,0,_depth + delta_z,c),0,_width*_height*(-delta_z)*sizeof(T));
-            } else cimg_forC(*this,c) {
-              std::memmove(data(0,0,delta_z,c),data(0,0,0,c),_width*_height*(_depth-delta_z)*sizeof(T));
-              std::memset(data(0,0,0,c),0,delta_z*_width*_height*sizeof(T));
-            }
-        }
-
-      if (delta_c) // Shift along C-axis
-        switch (boundary_conditions) {
-        case 2 : { // Periodic
-          const int ml = cimg::mod(-delta_c,spectrum()), ndelta_c = (ml<=spectrum()/2)?ml:(ml-spectrum());
-          if (!ndelta_c) return *this;
-          CImg<T> buf(width(),height(),depth(),cimg::abs(ndelta_c));
-          if (ndelta_c>0) {
-            std::memcpy(buf,_data,_width*_height*_depth*ndelta_c*sizeof(T));
-            std::memmove(_data,data(0,0,0,ndelta_c),_width*_height*_depth*(_spectrum-ndelta_c)*sizeof(T));
-            std::memcpy(data(0,0,0,_spectrum-ndelta_c),buf,_width*_height*_depth*ndelta_c*sizeof(T));
-          } else {
-            std::memcpy(buf,data(0,0,0,_spectrum + ndelta_c),-ndelta_c*_width*_height*_depth*sizeof(T));
-            std::memmove(data(0,0,0,-ndelta_c),_data,_width*_height*_depth*(_spectrum + ndelta_c)*sizeof(T));
-            std::memcpy(_data,buf,-ndelta_c*_width*_height*_depth*sizeof(T));
-          }
-        } break;
-        case 1 : // Neumann
-          if (delta_c<0) {
-            const int ndelta_c = (-delta_c>=spectrum())?spectrum() - 1:-delta_c;
-            if (!ndelta_c) return *this;
-            std::memmove(_data,data(0,0,0,ndelta_c),_width*_height*_depth*(_spectrum-ndelta_c)*sizeof(T));
-            T *ptrd = data(0,0,0,_spectrum-ndelta_c), *ptrs = data(0,0,0,_spectrum - 1);
-            for (int l = 0; l<ndelta_c - 1; ++l) {
-              std::memcpy(ptrd,ptrs,_width*_height*_depth*sizeof(T)); ptrd+=(ulongT)_width*_height*_depth;
-            }
-          } else {
-            const int ndelta_c = (delta_c>=spectrum())?spectrum() - 1:delta_c;
-            if (!ndelta_c) return *this;
-            std::memmove(data(0,0,0,ndelta_c),_data,_width*_height*_depth*(_spectrum-ndelta_c)*sizeof(T));
-            T *ptrd = data(0,0,0,1);
-            for (int l = 0; l<ndelta_c - 1; ++l) {
-              std::memcpy(ptrd,_data,_width*_height*_depth*sizeof(T)); ptrd+=(ulongT)_width*_height*_depth;
-            }
-          }
-          break;
-        default : // Dirichlet
-          if (cimg::abs(delta_c)>=spectrum()) return fill((T)0);
-          if (delta_c<0) {
-            std::memmove(_data,data(0,0,0,-delta_c),_width*_height*_depth*(_spectrum + delta_c)*sizeof(T));
-            std::memset(data(0,0,0,_spectrum + delta_c),0,_width*_height*_depth*(-delta_c)*sizeof(T));
-          } else {
-            std::memmove(data(0,0,0,delta_c),_data,_width*_height*_depth*(_spectrum-delta_c)*sizeof(T));
-            std::memset(_data,0,delta_c*_width*_height*_depth*sizeof(T));
-          }
-        }
-      return *this;
-    }
-
-    //! Shift image content \newinstance.
-    CImg<T> get_shift(const int delta_x, const int delta_y=0, const int delta_z=0, const int delta_c=0,
-                      const unsigned int boundary_conditions=0) const {
-      return (+*this).shift(delta_x,delta_y,delta_z,delta_c,boundary_conditions);
-    }
-
-    //! Permute axes order.
-    /**
-       \param order Axes permutations, as a C-string of 4 characters.
-       This function permutes image content regarding the specified axes permutation.
-    **/
-    CImg<T>& permute_axes(const char *const order) {
-      return get_permute_axes(order).move_to(*this);
-    }
-
-    //! Permute axes order \newinstance.
-    CImg<T> get_permute_axes(const char *const order) const {
-      const T foo = (T)0;
-      return _permute_axes(order,foo);
-    }
-
-    template<typename t>
-    CImg<t> _permute_axes(const char *const order, const t&) const {
-      if (is_empty() || !order) return CImg<t>(*this,false);
-      CImg<t> res;
-      const T* ptrs = _data;
-      unsigned char s_code[4] = { 0,1,2,3 }, n_code[4] = { 0 };
-      for (unsigned int l = 0; order[l]; ++l) {
-        int c = cimg::lowercase(order[l]);
-        if (c!='x' && c!='y' && c!='z' && c!='c') { *s_code = 4; break; }
-        else { ++n_code[c%=4]; s_code[l] = c; }
-      }
-      if (*order && *s_code<4 && *n_code<=1 && n_code[1]<=1 && n_code[2]<=1 && n_code[3]<=1) {
-        const unsigned int code = (s_code[0]<<12) | (s_code[1]<<8) | (s_code[2]<<4) | (s_code[3]);
-        ulongT wh, whd;
-        switch (code) {
-        case 0x0123 : // xyzc
-          return +*this;
-        case 0x0132 : // xycz
-          res.assign(_width,_height,_spectrum,_depth);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(x,y,c,z,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x0213 : // xzyc
-          res.assign(_width,_depth,_height,_spectrum);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(x,z,y,c,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x0231 : // xzcy
-          res.assign(_width,_depth,_spectrum,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(x,z,c,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x0312 : // xcyz
-          res.assign(_width,_spectrum,_height,_depth);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(x,c,y,z,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x0321 : // xczy
-          res.assign(_width,_spectrum,_depth,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(x,c,z,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x1023 : // yxzc
-          res.assign(_height,_width,_depth,_spectrum);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(y,x,z,c,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x1032 : // yxcz
-          res.assign(_height,_width,_spectrum,_depth);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(y,x,c,z,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x1203 : // yzxc
-          res.assign(_height,_depth,_width,_spectrum);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(y,z,x,c,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x1230 : // yzcx
-          res.assign(_height,_depth,_spectrum,_width);
-          switch (_width) {
-          case 1 : {
-            t *ptr_r = res.data(0,0,0,0);
-            for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
-              *(ptr_r++) = (t)*(ptrs++);
-            }
-          } break;
-          case 2 : {
-            t *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1);
-            for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
-              *(ptr_r++) = (t)ptrs[0];
-              *(ptr_g++) = (t)ptrs[1];
-              ptrs+=2;
-            }
-          } break;
-          case 3 : { // Optimization for the classical conversion from interleaved RGB to planar RGB
-            t *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1), *ptr_b = res.data(0,0,0,2);
-            for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
-              *(ptr_r++) = (t)ptrs[0];
-              *(ptr_g++) = (t)ptrs[1];
-              *(ptr_b++) = (t)ptrs[2];
-              ptrs+=3;
-            }
-          } break;
-          case 4 : { // Optimization for the classical conversion from interleaved RGBA to planar RGBA
-            t
-              *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1),
-              *ptr_b = res.data(0,0,0,2), *ptr_a = res.data(0,0,0,3);
-            for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
-              *(ptr_r++) = (t)ptrs[0];
-              *(ptr_g++) = (t)ptrs[1];
-              *(ptr_b++) = (t)ptrs[2];
-              *(ptr_a++) = (t)ptrs[3];
-              ptrs+=4;
-            }
-          } break;
-          default : {
-            wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-            cimg_forXYZC(*this,x,y,z,c) res(y,z,c,x,wh,whd) = *(ptrs++);
-            return res;
-          }
-          }
-          break;
-        case 0x1302 : // ycxz
-          res.assign(_height,_spectrum,_width,_depth);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(y,c,x,z,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x1320 : // yczx
-          res.assign(_height,_spectrum,_depth,_width);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(y,c,z,x,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2013 : // zxyc
-          res.assign(_depth,_width,_height,_spectrum);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,x,y,c,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2031 : // zxcy
-          res.assign(_depth,_width,_spectrum,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,x,c,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2103 : // zyxc
-          res.assign(_depth,_height,_width,_spectrum);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,y,x,c,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2130 : // zycx
-          res.assign(_depth,_height,_spectrum,_width);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,y,c,x,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2301 : // zcxy
-          res.assign(_depth,_spectrum,_width,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,c,x,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x2310 : // zcyx
-          res.assign(_depth,_spectrum,_height,_width);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(z,c,y,x,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x3012 : // cxyz
-          res.assign(_spectrum,_width,_height,_depth);
-          switch (_spectrum) {
-          case 1 : {
-            const T *ptr_r = data(0,0,0,0);
-            t *ptrd = res._data;
-            for (ulongT siz = (ulongT)_width*_height*_depth; siz; --siz) *(ptrd++) = (t)*(ptr_r++);
-          } break;
-          case 2 : {
-            const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1);
-            t *ptrd = res._data;
-            for (ulongT siz = (ulongT)_width*_height*_depth; siz; --siz) {
-              ptrd[0] = (t)*(ptr_r++);
-              ptrd[1] = (t)*(ptr_g++);
-              ptrd+=2;
-            }
-          } break;
-          case 3 : { // Optimization for the classical conversion from planar RGB to interleaved RGB
-            const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
-            t *ptrd = res._data;
-            for (ulongT siz = (ulongT)_width*_height*_depth; siz; --siz) {
-              ptrd[0] = (t)*(ptr_r++);
-              ptrd[1] = (t)*(ptr_g++);
-              ptrd[2] = (t)*(ptr_b++);
-              ptrd+=3;
-            }
-          } break;
-          case 4 : { // Optimization for the classical conversion from planar RGBA to interleaved RGBA
-            const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
-            t *ptrd = res._data;
-            for (ulongT siz = (ulongT)_width*_height*_depth; siz; --siz) {
-              ptrd[0] = (t)*(ptr_r++);
-              ptrd[1] = (t)*(ptr_g++);
-              ptrd[2] = (t)*(ptr_b++);
-              ptrd[3] = (t)*(ptr_a++);
-              ptrd+=4;
-            }
-          } break;
-          default : {
-            wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-            cimg_forXYZC(*this,x,y,z,c) res(c,x,y,z,wh,whd) = (t)*(ptrs++);
-          }
-          }
-          break;
-        case 0x3021 : // cxzy
-          res.assign(_spectrum,_width,_depth,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(c,x,z,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x3102 : // cyxz
-          res.assign(_spectrum,_height,_width,_depth);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(c,y,x,z,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x3120 : // cyzx
-          res.assign(_spectrum,_height,_depth,_width);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(c,y,z,x,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x3201 : // czxy
-          res.assign(_spectrum,_depth,_width,_height);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(c,z,x,y,wh,whd) = (t)*(ptrs++);
-          break;
-        case 0x3210 : // czyx
-          res.assign(_spectrum,_depth,_height,_width);
-          wh = (ulongT)res._width*res._height; whd = wh*res._depth;
-          cimg_forXYZC(*this,x,y,z,c) res(c,z,y,x,wh,whd) = (t)*(ptrs++);
-          break;
-        }
-      }
-      if (!res)
-        throw CImgArgumentException(_cimg_instance
-                                    "permute_axes(): Invalid specified permutation '%s'.",
-                                    cimg_instance,
-                                    order);
-      return res;
-    }
-
-    //! Unroll pixel values along specified axis.
-    /**
-       \param axis Unroll axis (can be \c 'x', \c 'y', \c 'z' or c 'c').
-    **/
-    CImg<T>& unroll(const char axis) {
-      const unsigned int siz = (unsigned int)size();
-      if (siz) switch (cimg::lowercase(axis)) {
-      case 'x' : _width = siz; _height = _depth = _spectrum = 1; break;
-      case 'y' : _height = siz; _width = _depth = _spectrum = 1; break;
-      case 'z' : _depth = siz; _width = _height = _spectrum = 1; break;
-      default : _spectrum = siz; _width = _height = _depth = 1;
-      }
-      return *this;
-    }
-
-    //! Unroll pixel values along specified axis \newinstance.
-    CImg<T> get_unroll(const char axis) const {
-      return (+*this).unroll(axis);
-    }
-
-    //! Rotate image with arbitrary angle.
-    /**
-       \param angle Rotation angle, in degrees.
-       \param interpolation Type of interpolation. Can be <tt>{ 0=nearest | 1=linear | 2=cubic }</tt>.
-       \param boundary Boundary conditions. Can be <tt>{  0=dirichlet | 1=neumann | 2=periodic | 3=mirror }</tt>.
-       \note Most of the time, size of the image is modified.
-    **/
-    CImg<T>& rotate(const float angle, const unsigned int interpolation=1,
-                    const unsigned int boundary_conditions=0) {
-      const float nangle = cimg::mod(angle,360.0f);
-      if (nangle==0.0f) return *this;
-      return get_rotate(nangle,interpolation,boundary_conditions).move_to(*this);
-    }
-
-    //! Rotate image with arbitrary angle \newinstance.
-    CImg<T> get_rotate(const float angle, const unsigned int interpolation=1,
-                       const unsigned int boundary_conditions=0) const {
-      if (is_empty()) return *this;
-      CImg<T> res;
-      const float nangle = cimg::mod(angle,360.0f);
-      if (boundary_conditions!=1 && cimg::mod(nangle,90.0f)==0) { // Optimized version for orthogonal angles.
-        const int wm1 = width() - 1, hm1 = height() - 1;
-        const int iangle = (int)nangle/90;
-        switch (iangle) {
-        case 1 : { // 90 deg
-          res.assign(_height,_width,_depth,_spectrum);
-          T *ptrd = res._data;
-          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(y,hm1 - x,z,c);
-        } break;
-        case 2 : { // 180 deg
-          res.assign(_width,_height,_depth,_spectrum);
-          T *ptrd = res._data;
-          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(wm1 - x,hm1 - y,z,c);
-        } break;
-        case 3 : { // 270 deg
-          res.assign(_height,_width,_depth,_spectrum);
-          T *ptrd = res._data;
-          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(wm1 - y,x,z,c);
-        } break;
-        default : // 0 deg
-          return *this;
-        }
-      } else { // Generic angle
-        const float
-          rad = (float)(nangle*cimg::PI/180.0),
-          ca = (float)std::cos(rad), sa = (float)std::sin(rad),
-          ux = cimg::abs((_width - 1)*ca), uy = cimg::abs((_width - 1)*sa),
-          vx = cimg::abs((_height - 1)*sa), vy = cimg::abs((_height - 1)*ca),
-          w2 = 0.5f*(_width - 1), h2 = 0.5f*(_height - 1);
-        res.assign((int)cimg::round(1 + ux + vx),(int)cimg::round(1 + uy + vy),_depth,_spectrum);
-        const float rw2 = 0.5f*(res._width - 1), rh2 = 0.5f*(res._height - 1);
-        _rotate(res,nangle,interpolation,boundary_conditions,w2,h2,rw2,rh2);
-      }
-      return res;
-    }
-
-    //! Rotate image with arbitrary angle, around a center point.
-    /**
-       \param angle Rotation angle, in degrees.
-       \param cx X-coordinate of the rotation center.
-       \param cy Y-coordinate of the rotation center.
-       \param boundary_conditions Boundary conditions, <tt>{ 0=dirichlet | 1=neumann | 2=periodic | 3=mirror }</tt>.
-       \param interpolation_type Type of interpolation, <tt>{ 0=nearest | 1=linear | 2=cubic | 3=mirror }</tt>.
-    **/
-    CImg<T>& rotate(const float angle, const float cx, const float cy,
-                    const unsigned int interpolation, const unsigned int boundary_conditions=0) {
-      return get_rotate(angle,cx,cy,interpolation,boundary_conditions).move_to(*this);
-    }
-
-    //! Rotate image with arbitrary angle, around a center point \newinstance.
-    CImg<T> get_rotate(const float angle, const float cx, const float cy,
-                       const unsigned int interpolation, const unsigned int boundary_conditions=0) const {
-      if (is_empty()) return *this;
-      CImg<T> res(_width,_height,_depth,_spectrum);
-      _rotate(res,angle,interpolation,boundary_conditions,cx,cy,cx,cy);
-      return res;
-    }
-
-    // [internal] Perform 2d rotation with arbitrary angle.
-    void _rotate(CImg<T>& res, const float angle,
-                 const unsigned int interpolation, const unsigned int boundary_conditions,
-                 const float w2, const float h2,
-                 const float rw2, const float rh2) const {
-      const float
-        rad = (float)(angle*cimg::PI/180.0),
-        ca = (float)std::cos(rad), sa = (float)std::sin(rad);
-
-      switch (boundary_conditions) {
-      case 3 : { // Mirror
-
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          const float ww = 2.0f*width(), hh = 2.0f*height();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2,
-              mx = cimg::mod(w2 + xc*ca + yc*sa,ww),
-              my = cimg::mod(h2 - xc*sa + yc*ca,hh);
-            const Tfloat val = _cubic_atXY(mx<width()?mx:ww - mx - 1,my<height()?my:hh - my - 1,z,c);
-            res(x,y,z,c) = cimg::type<T>::cut(val);
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          const float ww = 2.0f*width(), hh = 2.0f*height();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2,
-              mx = cimg::mod(w2 + xc*ca + yc*sa,ww),
-              my = cimg::mod(h2 - xc*sa + yc*ca,hh);
-            res(x,y,z,c) = (T)_linear_atXY(mx<width()?mx:ww - mx - 1,my<height()?my:hh - my - 1,z,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          const int ww = 2*width(), hh = 2*height();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2,
-              mx = cimg::mod((int)cimg::round(w2 + xc*ca + yc*sa),ww),
-              my = cimg::mod((int)cimg::round(h2 - xc*sa + yc*ca),hh);
-            res(x,y,z,c) = (*this)(mx<width()?mx:ww - mx - 1,my<height()?my:hh - my - 1,z,c);
-          }
-        }
-        }
-      } break;
-
-      case 2 : // Periodic
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            const Tfloat val = _cubic_atXY(cimg::mod(w2 + xc*ca + yc*sa,(float)width()),
-                                           cimg::mod(h2 - xc*sa + yc*ca,(float)height()),z,c);
-            res(x,y,z,c) = cimg::type<T>::cut(val);
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = (T)_linear_atXY(cimg::mod(w2 + xc*ca + yc*sa,(float)width()),
-                                           cimg::mod(h2 - xc*sa + yc*ca,(float)height()),z,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-            cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = (*this)(cimg::mod((int)cimg::round(w2 + xc*ca + yc*sa),(float)width()),
-                                   cimg::mod((int)cimg::round(h2 - xc*sa + yc*ca),(float)height()),z,c);
-          }
-        }
-        } break;
-
-      case 1 : // Neumann
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            const Tfloat val = _cubic_atXY(w2 + xc*ca + yc*sa,h2 - xc*sa + yc*ca,z,c);
-            res(x,y,z,c) = cimg::type<T>::cut(val);
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = (T)_linear_atXY(w2 + xc*ca + yc*sa,h2 - xc*sa + yc*ca,z,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = _atXY((int)cimg::round(w2 + xc*ca + yc*sa),
-                                 (int)cimg::round(h2 - xc*sa + yc*ca),z,c);
-          }
-        }
-        } break;
-
-      default : // Dirichlet
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            const Tfloat val = cubic_atXY(w2 + xc*ca + yc*sa,h2 - xc*sa + yc*ca,z,c,(T)0);
-            res(x,y,z,c) = cimg::type<T>::cut(val);
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = (T)linear_atXY(w2 + xc*ca + yc*sa,h2 - xc*sa + yc*ca,z,c,(T)0);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZC(res,x,y,z,c) {
-            const float xc = x - rw2, yc = y - rh2;
-            res(x,y,z,c) = atXY((int)cimg::round(w2 + xc*ca + yc*sa),
-                                (int)cimg::round(h2 - xc*sa + yc*ca),z,c,(T)0);
-          }
-        }
-        }
-      }
-    }
-
-    //! Rotate volumetric image with arbitrary angle and axis.
-    /**
-       \param u X-coordinate of the 3d rotation axis.
-       \param v Y-coordinate of the 3d rotation axis.
-       \param w Z-coordinate of the 3d rotation axis.
-       \param angle Rotation angle, in degrees.
-       \param interpolation Type of interpolation. Can be <tt>{ 0=nearest | 1=linear | 2=cubic }</tt>.
-       \param boundary Boundary conditions. Can be <tt>{  0=dirichlet | 1=neumann | 2=periodic | 3=mirror }</tt>.
-       \note Most of the time, size of the image is modified.
-    **/
-    CImg<T> rotate(const float u, const float v, const float w, const float angle,
-                   const unsigned int interpolation, const unsigned int boundary_conditions) {
-      const float nangle = cimg::mod(angle,360.0f);
-      if (nangle==0.0f) return *this;
-      return get_rotate(u,v,w,nangle,interpolation,boundary_conditions).move_to(*this);
-    }
-
-    //! Rotate volumetric image with arbitrary angle and axis \newinstance.
-    CImg<T> get_rotate(const float u, const float v, const float w, const float angle,
-                       const unsigned int interpolation, const unsigned int boundary_conditions) const {
-      if (is_empty()) return *this;
-      CImg<T> res;
-      const float
-        w1 = _width - 1, h1 = _height - 1, d1 = _depth -1,
-        w2 = 0.5f*w1, h2 = 0.5f*h1, d2 = 0.5f*d1;
-      CImg<floatT> R = CImg<floatT>::rotation_matrix(u,v,w,angle);
-      const CImg<Tfloat>
-        X = R*CImg<Tfloat>(8,3,1,1,
-                           0.0f,w1,w1,0.0f,0.0f,w1,w1,0.0f,
-                           0.0f,0.0f,h1,h1,0.0f,0.0f,h1,h1,
-                           0.0f,0.0f,0.0f,0.0f,d1,d1,d1,d1);
-      float
-        xm, xM = X.get_shared_row(0).max_min(xm),
-        ym, yM = X.get_shared_row(1).max_min(ym),
-        zm, zM = X.get_shared_row(2).max_min(zm);
-      const int
-        dx = (int)cimg::round(xM - xm),
-        dy = (int)cimg::round(yM - ym),
-        dz = (int)cimg::round(zM - zm);
-      R.transpose();
-      res.assign(1 + dx,1 + dy,1 + dz,_spectrum);
-      const float rw2 = 0.5f*dx, rh2 = 0.5f*dy, rd2 = 0.5f*dz;
-      _rotate(res,R,interpolation,boundary_conditions,w2,h2,d2,rw2,rh2,rd2);
-      return res;
-    }
-
-    //! Rotate volumetric image with arbitrary angle and axis, around a center point.
-    /**
-       \param u X-coordinate of the 3d rotation axis.
-       \param v Y-coordinate of the 3d rotation axis.
-       \param w Z-coordinate of the 3d rotation axis.
-       \param cx X-coordinate of the rotation center.
-       \param cy Y-coordinate of the rotation center.
-       \param cz Z-coordinate of the rotation center.
-       \param angle Rotation angle, in degrees.
-       \param interpolation Type of interpolation. Can be <tt>{ 0=nearest | 1=linear | 2=cubic | 3=mirror }</tt>.
-       \param boundary Boundary conditions. Can be <tt>{  0=dirichlet | 1=neumann | 2=periodic }</tt>.
-       \note Most of the time, size of the image is modified.
-    **/
-    CImg<T> rotate(const float u, const float v, const float w, const float angle,
-                   const float cx, const float cy, const float cz,
-                   const unsigned int interpolation=1, const unsigned int boundary_conditions=0) {
-      const float nangle = cimg::mod(angle,360.0f);
-      if (nangle==0.0f) return *this;
-      return get_rotate(u,v,w,nangle,cx,cy,cz,interpolation,boundary_conditions).move_to(*this);
-    }
-
-    //! Rotate volumetric image with arbitrary angle and axis, around a center point \newinstance.
-    CImg<T> get_rotate(const float u, const float v, const float w, const float angle,
-                       const float cx, const float cy, const float cz,
-                       const unsigned int interpolation=1, const unsigned int boundary_conditions=0) const {
-      if (is_empty()) return *this;
-      CImg<T> res(_width,_height,_depth,_spectrum);
-      CImg<floatT> R = CImg<floatT>::rotation_matrix(u,v,w,-angle);
-      _rotate(res,R,interpolation,boundary_conditions,cx,cy,cz,cx,cy,cz);
-      return res;
-    }
-
-    // [internal] Perform 3d rotation with arbitrary axis and angle.
-    void _rotate(CImg<T>& res, const CImg<Tfloat>& R,
-                 const unsigned int interpolation, const unsigned int boundary_conditions,
-                 const float w2, const float h2, const float d2,
-                 const float rw2, const float rh2, const float rd2) const {
-      switch (boundary_conditions) {
-      case 3 : // Mirror
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          const float ww = 2.0f*width(), hh = 2.0f*height(), dd = 2.0f*depth();
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = cimg::mod((float)(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),ww),
-              Y = cimg::mod((float)(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),hh),
-              Z = cimg::mod((float)(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),dd);
-            cimg_forC(res,c) res(x,y,z,c) = cimg::type<T>::cut(_cubic_atXYZ(X<width()?X:ww - X - 1,
-                                                                            Y<height()?Y:hh - Y - 1,
-                                                                            Z<depth()?Z:dd - Z - z,c));
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          const float ww = 2.0f*width(), hh = 2.0f*height(), dd = 2.0f*depth();
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = cimg::mod((float)(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),ww),
-              Y = cimg::mod((float)(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),hh),
-              Z = cimg::mod((float)(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),dd);
-            cimg_forC(res,c) res(x,y,z,c) = (T)_linear_atXYZ(X<width()?X:ww - X - 1,
-                                                             Y<height()?Y:hh - Y - 1,
-                                                             Z<depth()?Z:dd - Z - 1,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          const int ww = 2*width(), hh = 2*height(), dd = 2*depth();
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float xc = x - rw2, yc = y - rh2, zc = z - rd2;
-            const int
-              X = cimg::mod((int)cimg::round(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),ww),
-              Y = cimg::mod((int)cimg::round(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),hh),
-              Z = cimg::mod((int)cimg::round(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),dd);
-            cimg_forC(res,c) res(x,y,z,c) = (*this)(X<width()?X:ww - X - 1,
-                                                    Y<height()?Y:hh - Y - 1,
-                                                    Z<depth()?Z:dd - Z -  1,c);
-          }
-        }
-        } break;
-
-      case 2 : // Periodic
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = cimg::mod((float)(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),(float)width()),
-              Y = cimg::mod((float)(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),(float)height()),
-              Z = cimg::mod((float)(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),(float)depth());
-            cimg_forC(res,c) res(x,y,z,c) = cimg::type<T>::cut(_cubic_atXYZ(X,Y,Z,c));
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = cimg::mod((float)(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),(float)width()),
-              Y = cimg::mod((float)(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),(float)height()),
-              Z = cimg::mod((float)(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),(float)depth());
-            cimg_forC(res,c) res(x,y,z,c) = (T)_linear_atXYZ(X,Y,Z,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float xc = x - rw2, yc = y - rh2, zc = z - rd2;
-            const int
-              X = cimg::mod((int)cimg::round(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),width()),
-              Y = cimg::mod((int)cimg::round(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),height()),
-              Z = cimg::mod((int)cimg::round(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc),depth());
-            cimg_forC(res,c) res(x,y,z,c) = (*this)(X,Y,Z,c);
-          }
-        }
-        } break;
-
-      case 1 : // Neumann
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc,
-              Y = h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc,
-              Z = d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc;
-            cimg_forC(res,c) res(x,y,z,c) = cimg::type<T>::cut(_cubic_atXYZ(X,Y,Z,c));
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc,
-              Y = h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc,
-              Z = d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc;
-            cimg_forC(res,c) res(x,y,z,c) = _linear_atXYZ(X,Y,Z,c);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float xc = x - rw2, yc = y - rh2, zc = z - rd2;
-            const int
-              X = (int)cimg::round(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),
-              Y = (int)cimg::round(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),
-              Z = (int)cimg::round(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc);
-            cimg_forC(res,c) res(x,y,z,c) = _atXYZ(X,Y,Z,c);
-          }
-        }
-        } break;
-
-      default : // Dirichlet
-        switch (interpolation) {
-        case 2 : { // Cubic interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc,
-              Y = h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc,
-              Z = d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc;
-            cimg_forC(res,c) res(x,y,z,c) = cimg::type<T>::cut(cubic_atXYZ(X,Y,Z,c,(T)0));
-          }
-        } break;
-        case 1 : { // Linear interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float
-              xc = x - rw2, yc = y - rh2, zc = z - rd2,
-              X = w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc,
-              Y = h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc,
-              Z = d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc;
-            cimg_forC(res,c) res(x,y,z,c) = linear_atXYZ(X,Y,Z,c,(T)0);
-          }
-        } break;
-        default : { // Nearest-neighbor interpolation
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res.size()>=2048))
-          cimg_forXYZ(res,x,y,z) {
-            const float xc = x - rw2, yc = y - rh2, zc = z - rd2;
-            const int
-              X = (int)cimg::round(w2 + R(0,0)*xc + R(1,0)*yc + R(2,0)*zc),
-              Y = (int)cimg::round(h2 + R(0,1)*xc + R(1,1)*yc + R(2,1)*zc),
-              Z = (int)cimg::round(d2 + R(0,2)*xc + R(1,2)*yc + R(2,2)*zc);
-            cimg_forC(res,c) res(x,y,z,c) = atXYZ(X,Y,Z,c,(T)0);
-          }
-        }
-        } break;
-      }
-    }
-
-    //! Warp image content by a warping field.
-    /**
-       \param warp Warping field.
-       \param mode Can be { 0=backward-absolute | 1=backward-relative | 2=forward-absolute | 3=foward-relative }
-       \param is_relative Tells if warping field gives absolute or relative warping coordinates.
-       \param interpolation Can be <tt>{ 0=nearest | 1=linear | 2=cubic }</tt>.
-       \param boundary_conditions Boundary conditions <tt>{ 0=dirichlet | 1=neumann | 2=periodic | 3=mirror }</tt>.
-    **/
-    template<typename t>
-    CImg<T>& warp(const CImg<t>& warp, const unsigned int mode=0,
-                  const unsigned int interpolation=1, const unsigned int boundary_conditions=0) {
-      return get_warp(warp,mode,interpolation,boundary_conditions).move_to(*this);
-    }
-
-    //! Warp image content by a warping field \newinstance
-    template<typename t>
-    CImg<T> get_warp(const CImg<t>& warp, const unsigned int mode=0,
-                     const unsigned int interpolation=1, const unsigned int boundary_conditions=0) const {
-      if (is_empty() || !warp) return *this;
-      if (mode && !is_sameXYZ(warp))
-        throw CImgArgumentException(_cimg_instance
-                                    "warp(): Instance and specified relative warping field (%u,%u,%u,%u,%p) "
-                                    "have different XYZ dimensions.",
-                                    cimg_instance,
-                                    warp._width,warp._height,warp._depth,warp._spectrum,warp._data);
-
-      CImg<T> res(warp._width,warp._height,warp._depth,_spectrum);
-
-      if (warp._spectrum==1) { // 1d warping
-        if (mode>=3) { // Forward-relative warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atX(*(ptrs++),x + (float)*(ptrs0++),y,z,c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int X = x + (int)cimg::round(*(ptrs0++));
-                if (X>=0 && X<width()) res(X,y,z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==2) { // Forward-absolute warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atX(*(ptrs++),(float)*(ptrs0++),y,z,c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int X = (int)cimg::round(*(ptrs0++));
-                if (X>=0 && X<width()) res(X,y,z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==1) { // Backward-relative warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float mx = cimg::mod(x - (float)*(ptrs0++),w2);
-                  *(ptrd++) = (T)_cubic_atX(mx<width()?mx:w2 - mx - 1,y,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atX(cimg::mod(x - (float)*(ptrs0++),(float)_width),y,z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atX(x - (float)*(ptrs0++),y,z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)cubic_atX(x - (float)*(ptrs0++),y,z,c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float mx = cimg::mod(x - (float)*(ptrs0++),w2);
-                  *(ptrd++) = (T)_linear_atX(mx<width()?mx:w2 - mx - 1,y,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atX(cimg::mod(x - (float)*(ptrs0++),(float)_width),y,z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atX(x - (float)*(ptrs0++),y,z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)linear_atX(x - (float)*(ptrs0++),y,z,c,(T)0);
-              }
-            }
-          else // Nearest-neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int mx = cimg::mod(x - (int)cimg::round(*(ptrs0++)),w2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,y,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod(x - (int)cimg::round(*(ptrs0++)),(int)_width),y,z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atX(x - (int)*(ptrs0++),y,z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atX(x - (int)*(ptrs0++),y,z,c,(T)0);
-              }
-            }
-        }
-        else { // Backward-absolute warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-                cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float mx = cimg::mod((float)*(ptrs0++),w2);
-                  *(ptrd++) = (T)_cubic_atX(mx<width()?mx:w2 - mx - 1,0,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atX(cimg::mod((float)*(ptrs0++),(float)_width),0,0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atX((float)*(ptrs0++),0,0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)cubic_atX((float)*(ptrs0++),0,0,c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-                cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float mx = cimg::mod((float)*(ptrs0++),w2);
-                  *(ptrd++) = (T)_linear_atX(mx<width()?mx:w2 - mx - 1,0,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atX(cimg::mod((float)*(ptrs0++),(float)_width),0,0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atX((float)*(ptrs0++),0,0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)linear_atX((float)*(ptrs0++),0,0,c,(T)0);
-              }
-            }
-          else // Nearest-neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-                cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int mx = cimg::mod((int)cimg::round(*(ptrs0++)),w2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,0,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod((int)cimg::round(*(ptrs0++)),(int)_width),0,0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atX((int)*(ptrs0++),0,0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atX((int)*(ptrs0++),0,0,c,(T)0);
-              }
-            }
-        }
-
-      } else if (warp._spectrum==2) { // 2d warping
-        if (mode>=3) { // Forward-relative warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atXY(*(ptrs++),x + (float)*(ptrs0++),y + (float)*(ptrs1++),z,c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int X = x + (int)cimg::round(*(ptrs0++)), Y = y + (int)cimg::round(*(ptrs1++));
-                if (X>=0 && X<width() && Y>=0 && Y<height()) res(X,Y,z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==2) { // Forward-absolute warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atXY(*(ptrs++),(float)*(ptrs0++),(float)*(ptrs1++),z,c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int X = (int)cimg::round(*(ptrs0++)), Y = (int)cimg::round(*(ptrs1++));
-                if (X>=0 && X<width() && Y>=0 && Y<height()) res(X,Y,z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==1) { // Backward-relative warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod(x - (float)*(ptrs0++),w2),
-                    my = cimg::mod(y - (float)*(ptrs1++),h2);
-                  *(ptrd++) = (T)_cubic_atXY(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXY(cimg::mod(x - (float)*(ptrs0++),(float)_width),
-                                                            cimg::mod(y - (float)*(ptrs1++),(float)_height),z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)cubic_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod(x - (float)*(ptrs0++),w2),
-                    my = cimg::mod(y - (float)*(ptrs1++),h2);
-                  *(ptrd++) = (T)_linear_atXY(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXY(cimg::mod(x - (float)*(ptrs0++),(float)_width),
-                                                             cimg::mod(y - (float)*(ptrs1++),(float)_height),z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)linear_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c,(T)0);
-              }
-            }
-          else // Nearest-neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width(), h2 = 2*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int
-                    mx = cimg::mod(x - (int)cimg::round(*(ptrs0++)),w2),
-                    my = cimg::mod(y - (int)cimg::round(*(ptrs1++)),h2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,z,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod(x - (int)cimg::round(*(ptrs0++)),(int)_width),
-                                                     cimg::mod(y - (int)cimg::round(*(ptrs1++)),(int)_height),z,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atXY(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atXY(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z,c,(T)0);
-              }
-            }
-        } else { // Backward-absolute warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod((float)*(ptrs0++),w2),
-                    my = cimg::mod((float)*(ptrs1++),h2);
-                  *(ptrd++) = (T)_cubic_atXY(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXY(cimg::mod((float)*(ptrs0++),(float)_width),
-                                                            cimg::mod((float)*(ptrs1++),(float)_height),0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)cubic_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod((float)*(ptrs0++),w2),
-                    my = cimg::mod((float)*(ptrs1++),h2);
-                  *(ptrd++) = (T)_linear_atXY(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXY(cimg::mod((float)*(ptrs0++),(float)_width),
-                                                             cimg::mod((float)*(ptrs1++),(float)_height),0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)linear_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c,(T)0);
-              }
-            }
-          else // Nearest-neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width(), h2 = 2*height();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int
-                    mx = cimg::mod((int)cimg::round(*(ptrs0++)),w2),
-                    my = cimg::mod((int)cimg::round(*(ptrs1++)),h2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,my<height()?my:h2 - my - 1,0,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod((int)cimg::round(*(ptrs0++)),(int)_width),
-                                                     cimg::mod((int)cimg::round(*(ptrs1++)),(int)_height),0,c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atXY((int)*(ptrs0++),(int)*(ptrs1++),0,c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1); T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atXY((int)*(ptrs0++),(int)*(ptrs1++),0,c,(T)0);
-              }
-            }
-        }
-
-      } else { // 3d warping
-        if (mode>=3) { // Forward-relative warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-              const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atXYZ(*(ptrs++),x + (float)*(ptrs0++),y + (float)*(ptrs1++),
-                                                    z + (float)*(ptrs2++),c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-              const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int
-                  X = x + (int)cimg::round(*(ptrs0++)),
-                  Y = y + (int)cimg::round(*(ptrs1++)),
-                  Z = z + (int)cimg::round(*(ptrs2++));
-                if (X>=0 && X<width() && Y>=0 && Y<height() && Z>=0 && Z<depth()) res(X,Y,Z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==2) { // Forward-absolute warp
-          res.fill((T)0);
-          if (interpolation>=1) // Linear interpolation
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-              const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) res.set_linear_atXYZ(*(ptrs++),(float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),c);
-            }
-          else // Nearest-neighbor interpolation
-            cimg_forYZC(res,y,z,c) {
-              const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-              const T *ptrs = data(0,y,z,c);
-              cimg_forX(res,x) {
-                const int
-                  X = (int)cimg::round(*(ptrs0++)),
-                  Y = (int)cimg::round(*(ptrs1++)),
-                  Z = (int)cimg::round(*(ptrs2++));
-                if (X>=0 && X<width() && Y>=0 && Y<height() && Z>=0 && Z<depth()) res(X,Y,Z,c) = *(ptrs++);
-              }
-            }
-        } else if (mode==1) { // Backward-relative warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height(), d2 = 2.0f*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod(x - (float)*(ptrs0++),w2),
-                    my = cimg::mod(y - (float)*(ptrs1++),h2),
-                    mz = cimg::mod(z - (float)*(ptrs2++),d2);
-                  *(ptrd++) = (T)_cubic_atXYZ(mx<width()?mx:w2 - mx - 1,
-                                              my<height()?my:h2 - my - 1,
-                                              mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXYZ(cimg::mod(x - (float)*(ptrs0++),(float)_width),
-                                                             cimg::mod(y - (float)*(ptrs1++),(float)_height),
-                                                             cimg::mod(z - (float)*(ptrs2++),(float)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x)
-                  *(ptrd++) = (T)_cubic_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x)
-                  *(ptrd++) = (T)cubic_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height(), d2 = 2.0f*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod(x - (float)*(ptrs0++),w2),
-                    my = cimg::mod(y - (float)*(ptrs1++),h2),
-                    mz = cimg::mod(z - (float)*(ptrs2++),d2);
-                  *(ptrd++) = (T)_linear_atXYZ(mx<width()?mx:w2 - mx - 1,
-                                               my<height()?my:h2 - my - 1,
-                                               mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXYZ(cimg::mod(x - (float)*(ptrs0++),(float)_width),
-                                                              cimg::mod(y - (float)*(ptrs1++),(float)_height),
-                                                              cimg::mod(z - (float)*(ptrs2++),(float)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x)
-                  *(ptrd++) = (T)_linear_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x)
-                  *(ptrd++) = (T)linear_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c,(T)0);
-              }
-            }
-          else // Nearest neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width(), h2 = 2*height(), d2 = 2*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int
-                    mx = cimg::mod(x - (int)cimg::round(*(ptrs0++)),w2),
-                    my = cimg::mod(y - (int)cimg::round(*(ptrs1++)),h2),
-                    mz = cimg::mod(z - (int)cimg::round(*(ptrs2++)),d2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,
-                                      my<height()?my:h2 - my - 1,
-                                      mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod(x - (int)cimg::round(*(ptrs0++)),(int)_width),
-                                                     cimg::mod(y - (int)cimg::round(*(ptrs1++)),(int)_height),
-                                                     cimg::mod(z - (int)cimg::round(*(ptrs2++)),(int)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atXYZ(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z - (int)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atXYZ(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z - (int)*(ptrs2++),c,(T)0);
-              }
-            }
-        } else { // Backward-absolute warp
-          if (interpolation==2) // Cubic interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height(), d2 = 2.0f*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod((float)*(ptrs0++),w2),
-                    my = cimg::mod((float)*(ptrs1++),h2),
-                    mz = cimg::mod((float)*(ptrs2++),d2);
-                  *(ptrd++) = (T)_cubic_atXYZ(mx<width()?mx:w2 - mx - 1,
-                                              my<height()?my:h2 - my - 1,
-                                              mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXYZ(cimg::mod((float)*(ptrs0++),(float)_width),
-                                                             cimg::mod((float)*(ptrs1++),(float)_height),
-                                                             cimg::mod((float)*(ptrs2++),(float)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_cubic_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)cubic_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),
-                                                            c,(T)0);
-              }
-            }
-          else if (interpolation==1) // Linear interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const float w2 = 2.0f*width(), h2 = 2.0f*height(), d2 = 2.0f*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const float
-                    mx = cimg::mod((float)*(ptrs0++),w2),
-                    my = cimg::mod((float)*(ptrs1++),h2),
-                    mz = cimg::mod((float)*(ptrs2++),d2);
-                  *(ptrd++) = (T)_linear_atXYZ(mx<width()?mx:w2 - mx - 1,
-                                               my<height()?my:h2 - my - 1,
-                                               mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 :// Periodic
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXYZ(cimg::mod((float)*(ptrs0++),(float)_width),
-                                                              cimg::mod((float)*(ptrs1++),(float)_height),
-                                                              cimg::mod((float)*(ptrs2++),(float)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)_linear_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=1048576))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (T)linear_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),
-                                                             c,(T)0);
-              }
-            }
-          else // Nearest-neighbor interpolation
-            switch (boundary_conditions) {
-            case 3 : { // Mirror
-              const int w2 = 2*width(), h2 = 2*height(), d2 = 2*depth();
-              cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(res.size()>=4096))
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) {
-                  const int
-                    mx = cimg::mod((int)cimg::round(*(ptrs0++)),w2),
-                    my = cimg::mod((int)cimg::round(*(ptrs1++)),h2),
-                    mz = cimg::mod((int)cimg::round(*(ptrs2++)),d2);
-                  *(ptrd++) = (*this)(mx<width()?mx:w2 - mx - 1,
-                                      my<height()?my:h2 - my - 1,
-                                      mz<depth()?mz:d2 - mz - 1,c);
-                }
-              }
-            } break;
-            case 2 : // Periodic
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = (*this)(cimg::mod((int)cimg::round(*(ptrs0++)),(int)_width),
-                                                     cimg::mod((int)cimg::round(*(ptrs1++)),(int)_height),
-                                                     cimg::mod((int)cimg::round(*(ptrs2++)),(int)_depth),c);
-              }
-              break;
-            case 1 : // Neumann
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = _atXYZ((int)*(ptrs0++),(int)*(ptrs1++),(int)*(ptrs2++),c);
-              }
-              break;
-            default : // Dirichlet
-              cimg_forYZC(res,y,z,c) {
-                const t *ptrs0 = warp.data(0,y,z,0), *ptrs1 = warp.data(0,y,z,1), *ptrs2 = warp.data(0,y,z,2);
-                T *ptrd = res.data(0,y,z,c);
-                cimg_forX(res,x) *(ptrd++) = atXYZ((int)*(ptrs0++),(int)*(ptrs1++),(int)*(ptrs2++),c,(T)0);
-              }
-            }
-        }
-      }
-      return res;
-    }
-
-    //! Generate a 2d representation of a 3d image, with XY,XZ and YZ views.
-    /**
-       \param x0 X-coordinate of the projection point.
-       \param y0 Y-coordinate of the projection point.
-       \param z0 Z-coordinate of the projection point.
-    **/
-    CImg<T> get_projections2d(const unsigned int x0, const unsigned int y0, const unsigned int z0) const {
-      if (is_empty() || _depth<2) return +*this;
-      const unsigned int
-        _x0 = (x0>=_width)?_width - 1:x0,
-        _y0 = (y0>=_height)?_height - 1:y0,
-        _z0 = (z0>=_depth)?_depth - 1:z0;
-      const CImg<T>
-        img_xy = get_crop(0,0,_z0,0,_width - 1,_height - 1,_z0,_spectrum - 1),
-        img_zy = get_crop(_x0,0,0,0,_x0,_height - 1,_depth - 1,_spectrum - 1).permute_axes("xzyc").
-        resize(_depth,_height,1,-100,-1),
-        img_xz = get_crop(0,_y0,0,0,_width - 1,_y0,_depth - 1,_spectrum - 1).resize(_width,_depth,1,-100,-1);
-      return CImg<T>(_width + _depth,_height + _depth,1,_spectrum,cimg::min(img_xy.min(),img_zy.min(),img_xz.min())).
-        draw_image(0,0,img_xy).draw_image(img_xy._width,0,img_zy).
-        draw_image(0,img_xy._height,img_xz);
-    }
-
-    //! Construct a 2d representation of a 3d image, with XY,XZ and YZ views \inplace.
-    CImg<T>& projections2d(const unsigned int x0, const unsigned int y0, const unsigned int z0) {
-      if (_depth<2) return *this;
-      return get_projections2d(x0,y0,z0).move_to(*this);
-    }
-
-    //! Crop image region.
-    /**
-       \param x0 = X-coordinate of the upper-left crop rectangle corner.
-       \param y0 = Y-coordinate of the upper-left crop rectangle corner.
-       \param z0 = Z-coordinate of the upper-left crop rectangle corner.
-       \param c0 = C-coordinate of the upper-left crop rectangle corner.
-       \param x1 = X-coordinate of the lower-right crop rectangle corner.
-       \param y1 = Y-coordinate of the lower-right crop rectangle corner.
-       \param z1 = Z-coordinate of the lower-right crop rectangle corner.
-       \param c1 = C-coordinate of the lower-right crop rectangle corner.
-       \param boundary_conditions = Can be { 0=dirichlet | 1=neumann | 2=periodic | 3=mirror }.
-    **/
-    CImg<T>& crop(const int x0, const int y0, const int z0, const int c0,
-                  const int x1, const int y1, const int z1, const int c1,
-                  const unsigned int boundary_conditions=0) {
-      return get_crop(x0,y0,z0,c0,x1,y1,z1,c1,boundary_conditions).move_to(*this);
-    }
-
-    //! Crop image region \newinstance.
-    CImg<T> get_crop(const int x0, const int y0, const int z0, const int c0,
-                     const int x1, const int y1, const int z1, const int c1,
-                     const unsigned int boundary_conditions=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "crop(): Empty instance.",
-                                    cimg_instance);
-      const int
-        nx0 = x0<x1?x0:x1, nx1 = x0^x1^nx0,
-        ny0 = y0<y1?y0:y1, ny1 = y0^y1^ny0,
-        nz0 = z0<z1?z0:z1, nz1 = z0^z1^nz0,
-        nc0 = c0<c1?c0:c1, nc1 = c0^c1^nc0;
-      CImg<T> res(1U + nx1 - nx0,1U + ny1 - ny0,1U + nz1 - nz0,1U + nc1 - nc0);
-      if (nx0<0 || nx1>=width() || ny0<0 || ny1>=height() || nz0<0 || nz1>=depth() || nc0<0 || nc1>=spectrum())
-        switch (boundary_conditions) {
-        case 3 : { // Mirror
-          const int w2 = 2*width(), h2 = 2*height(), d2 = 2*depth(), s2 = 2*spectrum();
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=16 && _height*_depth*_spectrum>=4))
-          cimg_forXYZC(res,x,y,z,c) {
-            const int
-              mx = cimg::mod(nx0 + x,w2),
-              my = cimg::mod(ny0 + y,h2),
-              mz = cimg::mod(nz0 + z,d2),
-              mc = cimg::mod(nc0 + c,s2);
-            res(x,y,z,c) = (*this)(mx<width()?mx:w2 - mx - 1,
-                                   my<height()?my:h2 - my - 1,
-                                   mz<depth()?mz:d2 - mz - 1,
-                                   mc<spectrum()?mc:s2 - mc - 1);
-          }
-        } break;
-        case 2 : { // Periodic
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=16 && _height*_depth*_spectrum>=4))
-          cimg_forXYZC(res,x,y,z,c) {
-            res(x,y,z,c) = (*this)(cimg::mod(nx0 + x,width()),cimg::mod(ny0 + y,height()),
-                                   cimg::mod(nz0 + z,depth()),cimg::mod(nc0 + c,spectrum()));
-          }
-        } break;
-        case 1 : // Neumann
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=16 && _height*_depth*_spectrum>=4))
-          cimg_forXYZC(res,x,y,z,c) res(x,y,z,c) = _atXYZC(nx0 + x,ny0 + y,nz0 + z,nc0 + c);
-          break;
-        default : // Dirichlet
-          res.fill((T)0).draw_image(-nx0,-ny0,-nz0,-nc0,*this);
-        }
-      else res.draw_image(-nx0,-ny0,-nz0,-nc0,*this);
-      return res;
-    }
-
-    //! Crop image region \overloading.
-    CImg<T>& crop(const int x0, const int y0, const int z0,
-                  const int x1, const int y1, const int z1,
-                  const unsigned int boundary_conditions=0) {
-      return crop(x0,y0,z0,0,x1,y1,z1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Crop image region \newinstance.
-    CImg<T> get_crop(const int x0, const int y0, const int z0,
-                     const int x1, const int y1, const int z1,
-                     const unsigned int boundary_conditions=0) const {
-      return get_crop(x0,y0,z0,0,x1,y1,z1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Crop image region \overloading.
-    CImg<T>& crop(const int x0, const int y0,
-                  const int x1, const int y1,
-                  const unsigned int boundary_conditions=0) {
-      return crop(x0,y0,0,0,x1,y1,_depth - 1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Crop image region \newinstance.
-    CImg<T> get_crop(const int x0, const int y0,
-                     const int x1, const int y1,
-                     const unsigned int boundary_conditions=0) const {
-      return get_crop(x0,y0,0,0,x1,y1,_depth - 1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Crop image region \overloading.
-    CImg<T>& crop(const int x0, const int x1, const unsigned int boundary_conditions=0) {
-      return crop(x0,0,0,0,x1,_height - 1,_depth - 1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Crop image region \newinstance.
-    CImg<T> get_crop(const int x0, const int x1, const unsigned int boundary_conditions=0) const {
-      return get_crop(x0,0,0,0,x1,_height - 1,_depth - 1,_spectrum - 1,boundary_conditions);
-    }
-
-    //! Autocrop image region, regarding the specified background value.
-    CImg<T>& autocrop(const T& value, const char *const axes="czyx") {
-      if (is_empty()) return *this;
-      for (const char *s = axes; *s; ++s) {
-        const char axis = cimg::lowercase(*s);
-        const CImg<intT> coords = _autocrop(value,axis);
-        if (coords[0]==-1 && coords[1]==-1) return assign(); // Image has only 'value' pixels.
-        else switch (axis) {
-        case 'x' : {
-          const int x0 = coords[0], x1 = coords[1];
-          if (x0>=0 && x1>=0) crop(x0,x1);
-        } break;
-        case 'y' : {
-          const int y0 = coords[0], y1 = coords[1];
-          if (y0>=0 && y1>=0) crop(0,y0,_width - 1,y1);
-        } break;
-        case 'z' : {
-          const int z0 = coords[0], z1 = coords[1];
-          if (z0>=0 && z1>=0) crop(0,0,z0,_width - 1,_height - 1,z1);
-        } break;
-        default : {
-          const int c0 = coords[0], c1 = coords[1];
-          if (c0>=0 && c1>=0) crop(0,0,0,c0,_width - 1,_height - 1,_depth - 1,c1);
-        }
-        }
-      }
-      return *this;
-    }
-
-    //! Autocrop image region, regarding the specified background value \newinstance.
-    CImg<T> get_autocrop(const T& value, const char *const axes="czyx") const {
-      return (+*this).autocrop(value,axes);
-    }
-
-    //! Autocrop image region, regarding the specified background color.
-    /**
-       \param color Color used for the crop. If \c 0, color is guessed.
-       \param axes Axes used for the crop.
-    **/
-    CImg<T>& autocrop(const T *const color=0, const char *const axes="zyx") {
-      if (is_empty()) return *this;
-      if (!color) { // Guess color.
-        const CImg<T> col1 = get_vector_at(0,0,0);
-        const unsigned int w = _width, h = _height, d = _depth, s = _spectrum;
-        autocrop(col1,axes);
-        if (_width==w && _height==h && _depth==d && _spectrum==s) {
-          const CImg<T> col2 = get_vector_at(w - 1,h - 1,d - 1);
-          autocrop(col2,axes);
-        }
-        return *this;
-      }
-      for (const char *s = axes; *s; ++s) {
-        const char axis = cimg::lowercase(*s);
-        switch (axis) {
-        case 'x' : {
-          int x0 = width(), x1 = -1;
-          cimg_forC(*this,c) {
-            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'x');
-            const int nx0 = coords[0], nx1 = coords[1];
-            if (nx0>=0 && nx1>=0) { x0 = std::min(x0,nx0); x1 = std::max(x1,nx1); }
-          }
-          if (x0==width() && x1==-1) return assign(); else crop(x0,x1);
-        } break;
-        case 'y' : {
-          int y0 = height(), y1 = -1;
-          cimg_forC(*this,c) {
-            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'y');
-            const int ny0 = coords[0], ny1 = coords[1];
-            if (ny0>=0 && ny1>=0) { y0 = std::min(y0,ny0); y1 = std::max(y1,ny1); }
-          }
-          if (y0==height() && y1==-1) return assign(); else crop(0,y0,_width - 1,y1);
-        } break;
-        default : {
-          int z0 = depth(), z1 = -1;
-          cimg_forC(*this,c) {
-            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'z');
-            const int nz0 = coords[0], nz1 = coords[1];
-            if (nz0>=0 && nz1>=0) { z0 = std::min(z0,nz0); z1 = std::max(z1,nz1); }
-          }
-          if (z0==depth() && z1==-1) return assign(); else crop(0,0,z0,_width - 1,_height - 1,z1);
-        }
-        }
-      }
-      return *this;
-    }
-
-    //! Autocrop image region, regarding the specified background color \newinstance.
-    CImg<T> get_autocrop(const T *const color=0, const char *const axes="zyx") const {
-      return (+*this).autocrop(color,axes);
-    }
-
-    //! Autocrop image region, regarding the specified background color \overloading.
-    template<typename t> CImg<T>& autocrop(const CImg<t>& color, const char *const axes="zyx") {
-      return get_autocrop(color,axes).move_to(*this);
-    }
-
-    //! Autocrop image region, regarding the specified background color \newinstance.
-    template<typename t> CImg<T> get_autocrop(const CImg<t>& color, const char *const axes="zyx") const {
-      return get_autocrop(color._data,axes);
-    }
-
-    CImg<intT> _autocrop(const T& value, const char axis) const {
-      CImg<intT> res;
-      switch (cimg::lowercase(axis)) {
-      case 'x' : {
-        int x0 = -1, x1 = -1;
-        cimg_forX(*this,x) cimg_forYZC(*this,y,z,c)
-          if ((*this)(x,y,z,c)!=value) { x0 = x; x = width(); y = height(); z = depth(); c = spectrum(); }
-        if (x0>=0) {
-          for (int x = width() - 1; x>=0; --x) cimg_forYZC(*this,y,z,c)
-            if ((*this)(x,y,z,c)!=value) { x1 = x; x = 0; y = height(); z = depth(); c = spectrum(); }
-        }
-        res = CImg<intT>::vector(x0,x1);
-      } break;
-      case 'y' : {
-        int y0 = -1, y1 = -1;
-        cimg_forY(*this,y) cimg_forXZC(*this,x,z,c)
-          if ((*this)(x,y,z,c)!=value) { y0 = y; x = width(); y = height(); z = depth(); c = spectrum(); }
-        if (y0>=0) {
-          for (int y = height() - 1; y>=0; --y) cimg_forXZC(*this,x,z,c)
-            if ((*this)(x,y,z,c)!=value) { y1 = y; x = width(); y = 0; z = depth(); c = spectrum(); }
-        }
-        res = CImg<intT>::vector(y0,y1);
-      } break;
-      case 'z' : {
-        int z0 = -1, z1 = -1;
-        cimg_forZ(*this,z) cimg_forXYC(*this,x,y,c)
-          if ((*this)(x,y,z,c)!=value) { z0 = z; x = width(); y = height(); z = depth(); c = spectrum(); }
-        if (z0>=0) {
-          for (int z = depth() - 1; z>=0; --z) cimg_forXYC(*this,x,y,c)
-            if ((*this)(x,y,z,c)!=value) { z1 = z; x = width(); y = height(); z = 0; c = spectrum(); }
-        }
-        res = CImg<intT>::vector(z0,z1);
-      } break;
-      default : {
-        int c0 = -1, c1 = -1;
-        cimg_forC(*this,c) cimg_forXYZ(*this,x,y,z)
-          if ((*this)(x,y,z,c)!=value) { c0 = c; x = width(); y = height(); z = depth(); c = spectrum(); }
-        if (c0>=0) {
-          for (int c = spectrum() - 1; c>=0; --c) cimg_forXYZ(*this,x,y,z)
-            if ((*this)(x,y,z,c)!=value) { c1 = c; x = width(); y = height(); z = depth(); c = 0; }
-        }
-        res = CImg<intT>::vector(c0,c1);
-      }
-      }
-      return res;
-    }
-
-    //! Return specified image column.
-    /**
-       \param x0 Image column.
-    **/
-    CImg<T> get_column(const int x0) const {
-      return get_columns(x0,x0);
-    }
-
-    //! Return specified image column \inplace.
-    CImg<T>& column(const int x0) {
-      return columns(x0,x0);
-    }
-
-    //! Return specified range of image columns.
-    /**
-       \param x0 Starting image column.
-       \param x1 Ending image column.
-    **/
-    CImg<T>& columns(const int x0, const int x1) {
-      return get_columns(x0,x1).move_to(*this);
-    }
-
-    //! Return specified range of image columns \inplace.
-    CImg<T> get_columns(const int x0, const int x1) const {
-      return get_crop(x0,0,0,0,x1,height() - 1,depth() - 1,spectrum() - 1);
-    }
-
-    //! Return specified image row.
-    CImg<T> get_row(const int y0) const {
-      return get_rows(y0,y0);
-    }
-
-    //! Return specified image row \inplace.
-    /**
-       \param y0 Image row.
-    **/
-    CImg<T>& row(const int y0) {
-      return rows(y0,y0);
-    }
-
-    //! Return specified range of image rows.
-    /**
-       \param y0 Starting image row.
-       \param y1 Ending image row.
-    **/
-    CImg<T> get_rows(const int y0, const int y1) const {
-      return get_crop(0,y0,0,0,width() - 1,y1,depth() - 1,spectrum() - 1);
-    }
-
-    //! Return specified range of image rows \inplace.
-    CImg<T>& rows(const int y0, const int y1) {
-      return get_rows(y0,y1).move_to(*this);
-    }
-
-    //! Return specified image slice.
-    /**
-       \param z0 Image slice.
-    **/
-    CImg<T> get_slice(const int z0) const {
-      return get_slices(z0,z0);
-    }
-
-    //! Return specified image slice \inplace.
-    CImg<T>& slice(const int z0) {
-      return slices(z0,z0);
-    }
-
-    //! Return specified range of image slices.
-    /**
-       \param z0 Starting image slice.
-       \param z1 Ending image slice.
-    **/
-    CImg<T> get_slices(const int z0, const int z1) const {
-      return get_crop(0,0,z0,0,width() - 1,height() - 1,z1,spectrum() - 1);
-    }
-
-    //! Return specified range of image slices \inplace.
-    CImg<T>& slices(const int z0, const int z1) {
-      return get_slices(z0,z1).move_to(*this);
-    }
-
-    //! Return specified image channel.
-    /**
-       \param c0 Image channel.
-    **/
-    CImg<T> get_channel(const int c0) const {
-      return get_channels(c0,c0);
-    }
-
-    //! Return specified image channel \inplace.
-    CImg<T>& channel(const int c0) {
-      return channels(c0,c0);
-    }
-
-    //! Return specified range of image channels.
-    /**
-       \param c0 Starting image channel.
-       \param c1 Ending image channel.
-    **/
-    CImg<T> get_channels(const int c0, const int c1) const {
-      return get_crop(0,0,0,c0,width() - 1,height() - 1,depth() - 1,c1);
-    }
-
-    //! Return specified range of image channels \inplace.
-    CImg<T>& channels(const int c0, const int c1) {
-      return get_channels(c0,c1).move_to(*this);
-    }
-
-    //! Return stream line of a 2d or 3d vector field.
-    CImg<floatT> get_streamline(const float x, const float y, const float z,
-                                const float L=256, const float dl=0.1f,
-                                const unsigned int interpolation_type=2, const bool is_backward_tracking=false,
-                                const bool is_oriented_only=false) const {
-      if (_spectrum!=2 && _spectrum!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "streamline(): Instance is not a 2d or 3d vector field.",
-                                    cimg_instance);
-      if (_spectrum==2) {
-        if (is_oriented_only) {
-          typename CImg<T>::_functor4d_streamline2d_oriented func(*this);
-          return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,true,
-                            0,0,0,_width - 1.0f,_height - 1.0f,0.0f);
-        } else {
-          typename CImg<T>::_functor4d_streamline2d_directed func(*this);
-          return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,false,
-                            0,0,0,_width - 1.0f,_height - 1.0f,0.0f);
-        }
-      }
-      if (is_oriented_only) {
-        typename CImg<T>::_functor4d_streamline3d_oriented func(*this);
-        return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,true,
-                          0,0,0,_width - 1.0f,_height - 1.0f,_depth - 1.0f);
-      }
-      typename CImg<T>::_functor4d_streamline3d_directed func(*this);
-      return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,false,
-                        0,0,0,_width - 1.0f,_height - 1.0f,_depth - 1.0f);
-    }
-
-    //! Return stream line of a 3d vector field.
-    /**
-       \param func Vector field function.
-       \param x X-coordinate of the starting point of the streamline.
-       \param y Y-coordinate of the starting point of the streamline.
-       \param z Z-coordinate of the starting point of the streamline.
-       \param L Streamline length.
-       \param dl Streamline length increment.
-       \param interpolation_type Type of interpolation.
-         Can be <tt>{ 0=nearest int | 1=linear | 2=2nd-order RK | 3=4th-order RK. }</tt>.
-       \param is_backward_tracking Tells if the streamline is estimated forward or backward.
-       \param is_oriented_only Tells if the direction of the vectors must be ignored.
-       \param x0 X-coordinate of the first bounding-box vertex.
-       \param y0 Y-coordinate of the first bounding-box vertex.
-       \param z0 Z-coordinate of the first bounding-box vertex.
-       \param x1 X-coordinate of the second bounding-box vertex.
-       \param y1 Y-coordinate of the second bounding-box vertex.
-       \param z1 Z-coordinate of the second bounding-box vertex.
-    **/
-    template<typename tfunc>
-    static CImg<floatT> streamline(const tfunc& func,
-                                   const float x, const float y, const float z,
-                                   const float L=256, const float dl=0.1f,
-                                   const unsigned int interpolation_type=2, const bool is_backward_tracking=false,
-                                   const bool is_oriented_only=false,
-                                   const float x0=0, const float y0=0, const float z0=0,
-                                   const float x1=0, const float y1=0, const float z1=0) {
-      if (dl<=0)
-        throw CImgArgumentException("CImg<%s>::streamline(): Invalid specified integration length %g "
-                                    "(should be >0).",
-                                    pixel_type(),
-                                    dl);
-
-      const bool is_bounded = (x0!=x1 || y0!=y1 || z0!=z1);
-      if (L<=0 || (is_bounded && (x<x0 || x>x1 || y<y0 || y>y1 || z<z0 || z>z1))) return CImg<floatT>();
-      const unsigned int size_L = (unsigned int)cimg::round(L/dl + 1);
-      CImg<floatT> coordinates(size_L,3);
-      const float dl2 = dl/2;
-      float
-        *ptr_x = coordinates.data(0,0),
-        *ptr_y = coordinates.data(0,1),
-        *ptr_z = coordinates.data(0,2),
-        pu = (float)(dl*func(x,y,z,0)),
-        pv = (float)(dl*func(x,y,z,1)),
-        pw = (float)(dl*func(x,y,z,2)),
-        X = x, Y = y, Z = z;
-
-      switch (interpolation_type) {
-      case 0 : { // Nearest integer interpolation.
-        cimg_forX(coordinates,l) {
-          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
-          const int
-            xi = (int)(X>0?X + 0.5f:X - 0.5f),
-            yi = (int)(Y>0?Y + 0.5f:Y - 0.5f),
-            zi = (int)(Z>0?Z + 0.5f:Z - 0.5f);
-          float
-            u = (float)(dl*func((float)xi,(float)yi,(float)zi,0)),
-            v = (float)(dl*func((float)xi,(float)yi,(float)zi,1)),
-            w = (float)(dl*func((float)xi,(float)yi,(float)zi,2));
-          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
-          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
-          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
-        }
-      } break;
-      case 1 : { // First-order interpolation.
-        cimg_forX(coordinates,l) {
-          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
-          float
-            u = (float)(dl*func(X,Y,Z,0)),
-            v = (float)(dl*func(X,Y,Z,1)),
-            w = (float)(dl*func(X,Y,Z,2));
-          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
-          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
-          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
-        }
-      } break;
-      case 2 : { // Second order interpolation.
-        cimg_forX(coordinates,l) {
-          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
-          float
-            u0 = (float)(dl2*func(X,Y,Z,0)),
-            v0 = (float)(dl2*func(X,Y,Z,1)),
-            w0 = (float)(dl2*func(X,Y,Z,2));
-          if (is_oriented_only && u0*pu + v0*pv + w0*pw<0) { u0 = -u0; v0 = -v0; w0 = -w0; }
-          float
-            u = (float)(dl*func(X + u0,Y + v0,Z + w0,0)),
-            v = (float)(dl*func(X + u0,Y + v0,Z + w0,1)),
-            w = (float)(dl*func(X + u0,Y + v0,Z + w0,2));
-          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
-          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
-          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
-        }
-      } break;
-      default : { // Fourth order interpolation.
-        cimg_forX(coordinates,x) {
-          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
-          float
-            u0 = (float)(dl2*func(X,Y,Z,0)),
-            v0 = (float)(dl2*func(X,Y,Z,1)),
-            w0 = (float)(dl2*func(X,Y,Z,2));
-          if (is_oriented_only && u0*pu + v0*pv + w0*pw<0) { u0 = -u0; v0 = -v0; w0 = -w0; }
-          float
-            u1 = (float)(dl2*func(X + u0,Y + v0,Z + w0,0)),
-            v1 = (float)(dl2*func(X + u0,Y + v0,Z + w0,1)),
-            w1 = (float)(dl2*func(X + u0,Y + v0,Z + w0,2));
-          if (is_oriented_only && u1*pu + v1*pv + w1*pw<0) { u1 = -u1; v1 = -v1; w1 = -w1; }
-          float
-            u2 = (float)(dl2*func(X + u1,Y + v1,Z + w1,0)),
-            v2 = (float)(dl2*func(X + u1,Y + v1,Z + w1,1)),
-            w2 = (float)(dl2*func(X + u1,Y + v1,Z + w1,2));
-          if (is_oriented_only && u2*pu + v2*pv + w2*pw<0) { u2 = -u2; v2 = -v2; w2 = -w2; }
-          float
-            u3 = (float)(dl2*func(X + u2,Y + v2,Z + w2,0)),
-            v3 = (float)(dl2*func(X + u2,Y + v2,Z + w2,1)),
-            w3 = (float)(dl2*func(X + u2,Y + v2,Z + w2,2));
-          if (is_oriented_only && u2*pu + v2*pv + w2*pw<0) { u3 = -u3; v3 = -v3; w3 = -w3; }
-          const float
-            u = (u0 + u3)/3 + (u1 + u2)/1.5f,
-            v = (v0 + v3)/3 + (v1 + v2)/1.5f,
-            w = (w0 + w3)/3 + (w1 + w2)/1.5f;
-          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
-          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
-        }
-      }
-      }
-      if (ptr_x!=coordinates.data(0,1)) coordinates.resize((int)(ptr_x-coordinates.data()),3,1,1,0);
-      return coordinates;
-    }
-
-    //! Return stream line of a 3d vector field \overloading.
-    static CImg<floatT> streamline(const char *const expression,
-                                   const float x, const float y, const float z,
-                                   const float L=256, const float dl=0.1f,
-                                   const unsigned int interpolation_type=2, const bool is_backward_tracking=true,
-                                   const bool is_oriented_only=false,
-                                   const float x0=0, const float y0=0, const float z0=0,
-                                   const float x1=0, const float y1=0, const float z1=0) {
-      _functor4d_streamline_expr func(expression);
-      return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,is_oriented_only,x0,y0,z0,x1,y1,z1);
-    }
-
-    struct _functor4d_streamline2d_directed {
-      const CImg<T>& ref;
-      _functor4d_streamline2d_directed(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-        return c<2?(float)ref._linear_atXY(x,y,(int)z,c):0;
-      }
-    };
-
-    struct _functor4d_streamline3d_directed {
-      const CImg<T>& ref;
-      _functor4d_streamline3d_directed(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-        return (float)ref._linear_atXYZ(x,y,z,c);
-      }
-    };
-
-    struct _functor4d_streamline2d_oriented {
-      const CImg<T>& ref;
-      CImg<floatT> *pI;
-      _functor4d_streamline2d_oriented(const CImg<T>& pref):ref(pref),pI(0) { pI = new CImg<floatT>(2,2,1,2); }
-      ~_functor4d_streamline2d_oriented() { delete pI; }
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-#define _cimg_vecalign2d(i,j) \
-        if (I(i,j,0)*I(0,0,0) + I(i,j,1)*I(0,0,1)<0) { I(i,j,0) = -I(i,j,0); I(i,j,1) = -I(i,j,1); }
-        int
-          xi = (int)x - (x>=0?0:1), nxi = xi + 1,
-          yi = (int)y - (y>=0?0:1), nyi = yi + 1,
-          zi = (int)z;
-        const float
-          dx = x - xi,
-          dy = y - yi;
-        if (c==0) {
-          CImg<floatT>& I = *pI;
-          if (xi<0) xi = 0;
-          if (nxi<0) nxi = 0;
-          if (xi>=ref.width()) xi = ref.width() - 1;
-          if (nxi>=ref.width()) nxi = ref.width() - 1;
-          if (yi<0) yi = 0;
-          if (nyi<0) nyi = 0;
-          if (yi>=ref.height()) yi = ref.height() - 1;
-          if (nyi>=ref.height()) nyi = ref.height() - 1;
-          I(0,0,0) = (float)ref(xi,yi,zi,0);   I(0,0,1) = (float)ref(xi,yi,zi,1);
-          I(1,0,0) = (float)ref(nxi,yi,zi,0);  I(1,0,1) = (float)ref(nxi,yi,zi,1);
-          I(1,1,0) = (float)ref(nxi,nyi,zi,0); I(1,1,1) = (float)ref(nxi,nyi,zi,1);
-          I(0,1,0) = (float)ref(xi,nyi,zi,0);  I(0,1,1) = (float)ref(xi,nyi,zi,1);
-          _cimg_vecalign2d(1,0); _cimg_vecalign2d(1,1); _cimg_vecalign2d(0,1);
-        }
-        return c<2?(float)pI->_linear_atXY(dx,dy,0,c):0;
-      }
-    };
-
-    struct _functor4d_streamline3d_oriented {
-      const CImg<T>& ref;
-      CImg<floatT> *pI;
-      _functor4d_streamline3d_oriented(const CImg<T>& pref):ref(pref),pI(0) { pI = new CImg<floatT>(2,2,2,3); }
-      ~_functor4d_streamline3d_oriented() { delete pI; }
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-#define _cimg_vecalign3d(i,j,k) if (I(i,j,k,0)*I(0,0,0,0) + I(i,j,k,1)*I(0,0,0,1) + I(i,j,k,2)*I(0,0,0,2)<0) { \
-  I(i,j,k,0) = -I(i,j,k,0); I(i,j,k,1) = -I(i,j,k,1); I(i,j,k,2) = -I(i,j,k,2); }
-        int
-          xi = (int)x - (x>=0?0:1), nxi = xi + 1,
-          yi = (int)y - (y>=0?0:1), nyi = yi + 1,
-          zi = (int)z - (z>=0?0:1), nzi = zi + 1;
-        const float
-          dx = x - xi,
-          dy = y - yi,
-          dz = z - zi;
-        if (c==0) {
-          CImg<floatT>& I = *pI;
-          if (xi<0) xi = 0;
-          if (nxi<0) nxi = 0;
-          if (xi>=ref.width()) xi = ref.width() - 1;
-          if (nxi>=ref.width()) nxi = ref.width() - 1;
-          if (yi<0) yi = 0;
-          if (nyi<0) nyi = 0;
-          if (yi>=ref.height()) yi = ref.height() - 1;
-          if (nyi>=ref.height()) nyi = ref.height() - 1;
-          if (zi<0) zi = 0;
-          if (nzi<0) nzi = 0;
-          if (zi>=ref.depth()) zi = ref.depth() - 1;
-          if (nzi>=ref.depth()) nzi = ref.depth() - 1;
-          I(0,0,0,0) = (float)ref(xi,yi,zi,0); I(0,0,0,1) = (float)ref(xi,yi,zi,1);
-          I(0,0,0,2) = (float)ref(xi,yi,zi,2); I(1,0,0,0) = (float)ref(nxi,yi,zi,0);
-          I(1,0,0,1) = (float)ref(nxi,yi,zi,1); I(1,0,0,2) = (float)ref(nxi,yi,zi,2);
-          I(1,1,0,0) = (float)ref(nxi,nyi,zi,0); I(1,1,0,1) = (float)ref(nxi,nyi,zi,1);
-          I(1,1,0,2) = (float)ref(nxi,nyi,zi,2); I(0,1,0,0) = (float)ref(xi,nyi,zi,0);
-          I(0,1,0,1) = (float)ref(xi,nyi,zi,1); I(0,1,0,2) = (float)ref(xi,nyi,zi,2);
-          I(0,0,1,0) = (float)ref(xi,yi,nzi,0); I(0,0,1,1) = (float)ref(xi,yi,nzi,1);
-          I(0,0,1,2) = (float)ref(xi,yi,nzi,2); I(1,0,1,0) = (float)ref(nxi,yi,nzi,0);
-          I(1,0,1,1) = (float)ref(nxi,yi,nzi,1);  I(1,0,1,2) = (float)ref(nxi,yi,nzi,2);
-          I(1,1,1,0) = (float)ref(nxi,nyi,nzi,0); I(1,1,1,1) = (float)ref(nxi,nyi,nzi,1);
-          I(1,1,1,2) = (float)ref(nxi,nyi,nzi,2); I(0,1,1,0) = (float)ref(xi,nyi,nzi,0);
-          I(0,1,1,1) = (float)ref(xi,nyi,nzi,1);  I(0,1,1,2) = (float)ref(xi,nyi,nzi,2);
-          _cimg_vecalign3d(1,0,0); _cimg_vecalign3d(1,1,0); _cimg_vecalign3d(0,1,0);
-          _cimg_vecalign3d(0,0,1); _cimg_vecalign3d(1,0,1); _cimg_vecalign3d(1,1,1); _cimg_vecalign3d(0,1,1);
-        }
-        return (float)pI->_linear_atXYZ(dx,dy,dz,c);
-      }
-    };
-
-    struct _functor4d_streamline_expr {
-      _cimg_math_parser *mp;
-      ~_functor4d_streamline_expr() { mp->end(); delete mp; }
-      _functor4d_streamline_expr(const char *const expr):mp(0) {
-        mp = new _cimg_math_parser(expr,"streamline",CImg<T>::const_empty(),0);
-      }
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-        return (float)(*mp)(x,y,z,c);
-      }
-    };
-
-    //! Return a shared-memory image referencing a range of pixels of the image instance.
-    /**
-       \param x0 X-coordinate of the starting pixel.
-       \param x1 X-coordinate of the ending pixel.
-       \param y0 Y-coordinate.
-       \param z0 Z-coordinate.
-       \param c0 C-coordinate.
-     **/
-    CImg<T> get_shared_points(const unsigned int x0, const unsigned int x1,
-                              const unsigned int y0=0, const unsigned int z0=0, const unsigned int c0=0) {
-      const unsigned int
-        beg = (unsigned int)offset(x0,y0,z0,c0),
-        end = (unsigned int)offset(x1,y0,z0,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_points(): Invalid request of a shared-memory subset (%u->%u,%u,%u,%u).",
-                                    cimg_instance,
-                                    x0,x1,y0,z0,c0);
-
-      return CImg<T>(_data + beg,x1 - x0 + 1,1,1,1,true);
-    }
-
-    //! Return a shared-memory image referencing a range of pixels of the image instance \const.
-    const CImg<T> get_shared_points(const unsigned int x0, const unsigned int x1,
-                                    const unsigned int y0=0, const unsigned int z0=0, const unsigned int c0=0) const {
-      const unsigned int
-        beg = (unsigned int)offset(x0,y0,z0,c0),
-        end = (unsigned int)offset(x1,y0,z0,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_points(): Invalid request of a shared-memory subset (%u->%u,%u,%u,%u).",
-                                    cimg_instance,
-                                    x0,x1,y0,z0,c0);
-
-      return CImg<T>(_data + beg,x1 - x0 + 1,1,1,1,true);
-    }
-
-    //! Return a shared-memory image referencing a range of rows of the image instance.
-    /**
-       \param y0 Y-coordinate of the starting row.
-       \param y1 Y-coordinate of the ending row.
-       \param z0 Z-coordinate.
-       \param c0 C-coordinate.
-    **/
-    CImg<T> get_shared_rows(const unsigned int y0, const unsigned int y1,
-                             const unsigned int z0=0, const unsigned int c0=0) {
-      const unsigned int
-        beg = (unsigned int)offset(0,y0,z0,c0),
-        end = (unsigned int)offset(0,y1,z0,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_rows(): Invalid request of a shared-memory subset "
-                                    "(0->%u,%u->%u,%u,%u).",
-                                    cimg_instance,
-                                    _width - 1,y0,y1,z0,c0);
-
-      return CImg<T>(_data + beg,_width,y1 - y0 + 1,1,1,true);
-    }
-
-    //! Return a shared-memory image referencing a range of rows of the image instance \const.
-    const CImg<T> get_shared_rows(const unsigned int y0, const unsigned int y1,
-                                   const unsigned int z0=0, const unsigned int c0=0) const {
-      const unsigned int
-        beg = (unsigned int)offset(0,y0,z0,c0),
-        end = (unsigned int)offset(0,y1,z0,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_rows(): Invalid request of a shared-memory subset "
-                                    "(0->%u,%u->%u,%u,%u).",
-                                    cimg_instance,
-                                    _width - 1,y0,y1,z0,c0);
-
-      return CImg<T>(_data + beg,_width,y1 - y0 + 1,1,1,true);
-    }
-
-    //! Return a shared-memory image referencing one row of the image instance.
-    /**
-       \param y0 Y-coordinate.
-       \param z0 Z-coordinate.
-       \param c0 C-coordinate.
-    **/
-    CImg<T> get_shared_row(const unsigned int y0, const unsigned int z0=0, const unsigned int c0=0) {
-      return get_shared_rows(y0,y0,z0,c0);
-    }
-
-    //! Return a shared-memory image referencing one row of the image instance \const.
-    const CImg<T> get_shared_row(const unsigned int y0, const unsigned int z0=0, const unsigned int c0=0) const {
-      return get_shared_rows(y0,y0,z0,c0);
-    }
-
-    //! Return a shared memory image referencing a range of slices of the image instance.
-    /**
-       \param z0 Z-coordinate of the starting slice.
-       \param z1 Z-coordinate of the ending slice.
-       \param c0 C-coordinate.
-    **/
-    CImg<T> get_shared_slices(const unsigned int z0, const unsigned int z1, const unsigned int c0=0) {
-      const unsigned int
-        beg = (unsigned int)offset(0,0,z0,c0),
-        end = (unsigned int)offset(0,0,z1,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_slices(): Invalid request of a shared-memory subset "
-                                    "(0->%u,0->%u,%u->%u,%u).",
-                                    cimg_instance,
-                                    _width - 1,_height - 1,z0,z1,c0);
-
-      return CImg<T>(_data + beg,_width,_height,z1 - z0 + 1,1,true);
-    }
-
-    //! Return a shared memory image referencing a range of slices of the image instance \const.
-    const CImg<T> get_shared_slices(const unsigned int z0, const unsigned int z1, const unsigned int c0=0) const {
-      const unsigned int
-        beg = (unsigned int)offset(0,0,z0,c0),
-        end = (unsigned int)offset(0,0,z1,c0);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_slices(): Invalid request of a shared-memory subset "
-                                    "(0->%u,0->%u,%u->%u,%u).",
-                                    cimg_instance,
-                                    _width - 1,_height - 1,z0,z1,c0);
-
-      return CImg<T>(_data + beg,_width,_height,z1 - z0 + 1,1,true);
-    }
-
-    //! Return a shared-memory image referencing one slice of the image instance.
-    /**
-       \param z0 Z-coordinate.
-       \param c0 C-coordinate.
-    **/
-    CImg<T> get_shared_slice(const unsigned int z0, const unsigned int c0=0) {
-      return get_shared_slices(z0,z0,c0);
-    }
-
-    //! Return a shared-memory image referencing one slice of the image instance \const.
-    const CImg<T> get_shared_slice(const unsigned int z0, const unsigned int c0=0) const {
-      return get_shared_slices(z0,z0,c0);
-    }
-
-    //! Return a shared-memory image referencing a range of channels of the image instance.
-    /**
-       \param c0 C-coordinate of the starting channel.
-       \param c1 C-coordinate of the ending channel.
-    **/
-    CImg<T> get_shared_channels(const unsigned int c0, const unsigned int c1) {
-      const unsigned int
-        beg = (unsigned int)offset(0,0,0,c0),
-        end = (unsigned int)offset(0,0,0,c1);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_channels(): Invalid request of a shared-memory subset "
-                                    "(0->%u,0->%u,0->%u,%u->%u).",
-                                    cimg_instance,
-                                    _width - 1,_height - 1,_depth - 1,c0,c1);
-
-      return CImg<T>(_data + beg,_width,_height,_depth,c1 - c0 + 1,true);
-    }
-
-    //! Return a shared-memory image referencing a range of channels of the image instance \const.
-    const CImg<T> get_shared_channels(const unsigned int c0, const unsigned int c1) const {
-      const unsigned int
-        beg = (unsigned int)offset(0,0,0,c0),
-        end = (unsigned int)offset(0,0,0,c1);
-      if (beg>end || beg>=size() || end>=size())
-        throw CImgArgumentException(_cimg_instance
-                                    "get_shared_channels(): Invalid request of a shared-memory subset "
-                                    "(0->%u,0->%u,0->%u,%u->%u).",
-                                    cimg_instance,
-                                    _width - 1,_height - 1,_depth - 1,c0,c1);
-
-      return CImg<T>(_data + beg,_width,_height,_depth,c1 - c0 + 1,true);
-    }
-
-    //! Return a shared-memory image referencing one channel of the image instance.
-    /**
-       \param c0 C-coordinate.
-    **/
-    CImg<T> get_shared_channel(const unsigned int c0) {
-      return get_shared_channels(c0,c0);
-    }
-
-    //! Return a shared-memory image referencing one channel of the image instance \const.
-    const CImg<T> get_shared_channel(const unsigned int c0) const {
-      return get_shared_channels(c0,c0);
-    }
-
-    //! Return a shared-memory version of the image instance.
-    CImg<T> get_shared() {
-      return CImg<T>(_data,_width,_height,_depth,_spectrum,true);
-    }
-
-    //! Return a shared-memory version of the image instance \const.
-    const CImg<T> get_shared() const {
-      return CImg<T>(_data,_width,_height,_depth,_spectrum,true);
-    }
-
-    //! Split image into a list along specified axis.
-    /**
-       \param axis Splitting axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param nb Number of splitted parts.
-       \note
-       - If \c nb==0, instance image is splitted into blocs of egal values along the specified axis.
-       - If \c nb<=0, instance image is splitted into blocs of -\c nb pixel wide.
-       - If \c nb>0, instance image is splitted into \c nb blocs.
-    **/
-    CImgList<T> get_split(const char axis, const int nb=-1) const {
-      CImgList<T> res;
-      if (is_empty()) return res;
-      const char _axis = cimg::lowercase(axis);
-
-      if (nb<0) { // Split by bloc size.
-        const unsigned int dp = (unsigned int)(nb?-nb:1);
-        switch (_axis) {
-        case 'x': {
-          if (_width>dp) {
-            res.assign(_width/dp + (_width%dp?1:0),1,1);
-            const unsigned int pe = _width - dp;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=128 && _height*_depth*_spectrum>=128))
-            for (unsigned int p = 0; p<pe; p+=dp)
-              get_crop(p,0,0,0,p + dp - 1,_height - 1,_depth - 1,_spectrum - 1).move_to(res[p/dp]);
-            get_crop((res._width - 1)*dp,0,0,0,_width - 1,_height - 1,_depth - 1,_spectrum - 1).move_to(res.back());
-          } else res.assign(*this);
-        } break;
-        case 'y': {
-          if (_height>dp) {
-            res.assign(_height/dp + (_height%dp?1:0),1,1);
-            const unsigned int pe = _height - dp;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=128 && _width*_depth*_spectrum>=128))
-            for (unsigned int p = 0; p<pe; p+=dp)
-              get_crop(0,p,0,0,_width - 1,p + dp - 1,_depth - 1,_spectrum - 1).move_to(res[p/dp]);
-            get_crop(0,(res._width - 1)*dp,0,0,_width - 1,_height - 1,_depth - 1,_spectrum - 1).move_to(res.back());
-          } else res.assign(*this);
-        } break;
-        case 'z': {
-          if (_depth>dp) {
-            res.assign(_depth/dp + (_depth%dp?1:0),1,1);
-            const unsigned int pe = _depth - dp;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=128 && _width*_height*_spectrum>=128))
-            for (unsigned int p = 0; p<pe; p+=dp)
-              get_crop(0,0,p,0,_width - 1,_height - 1,p + dp - 1,_spectrum - 1).move_to(res[p/dp]);
-            get_crop(0,0,(res._width - 1)*dp,0,_width - 1,_height - 1,_depth - 1,_spectrum - 1).move_to(res.back());
-          } else res.assign(*this);
-        } break;
-        case 'c' : {
-          if (_spectrum>dp) {
-            res.assign(_spectrum/dp + (_spectrum%dp?1:0),1,1);
-            const unsigned int pe = _spectrum - dp;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=128 && _width*_height*_depth>=128))
-            for (unsigned int p = 0; p<pe; p+=dp)
-              get_crop(0,0,0,p,_width - 1,_height - 1,_depth - 1,p + dp - 1).move_to(res[p/dp]);
-            get_crop(0,0,0,(res._width - 1)*dp,_width - 1,_height - 1,_depth - 1,_spectrum - 1).move_to(res.back());
-          } else res.assign(*this);
-        }
-        }
-      } else if (nb>0) { // Split by number of (non-homogeneous) blocs.
-        const unsigned int siz = _axis=='x'?_width:_axis=='y'?_height:_axis=='z'?_depth:_axis=='c'?_spectrum:0;
-        if ((unsigned int)nb>siz)
-          throw CImgArgumentException(_cimg_instance
-                                      "get_split(): Instance cannot be split along %c-axis into %u blocs.",
-                                      cimg_instance,
-                                      axis,nb);
-        if (nb==1) res.assign(*this);
-        else {
-          int err = (int)siz;
-          unsigned int _p = 0;
-          switch (_axis) {
-          case 'x' : {
-            cimg_forX(*this,p) if ((err-=nb)<=0) {
-              get_crop(_p,0,0,0,p,_height - 1,_depth - 1,_spectrum - 1).move_to(res);
-              err+=(int)siz;
-              _p = p + 1U;
-            }
-          } break;
-          case 'y' : {
-            cimg_forY(*this,p) if ((err-=nb)<=0) {
-              get_crop(0,_p,0,0,_width - 1,p,_depth - 1,_spectrum - 1).move_to(res);
-              err+=(int)siz;
-              _p = p + 1U;
-            }
-          } break;
-          case 'z' : {
-            cimg_forZ(*this,p) if ((err-=nb)<=0) {
-              get_crop(0,0,_p,0,_width - 1,_height - 1,p,_spectrum - 1).move_to(res);
-              err+=(int)siz;
-              _p = p + 1U;
-            }
-          } break;
-          case 'c' : {
-            cimg_forC(*this,p) if ((err-=nb)<=0) {
-              get_crop(0,0,0,_p,_width - 1,_height - 1,_depth - 1,p).move_to(res);
-              err+=(int)siz;
-              _p = p + 1U;
-            }
-          }
-          }
-        }
-      } else { // Split by egal values according to specified axis.
-        T current = *_data;
-        switch (_axis) {
-        case 'x' : {
-          int i0 = 0;
-          cimg_forX(*this,i)
-            if ((*this)(i)!=current) { get_columns(i0,i - 1).move_to(res); i0 = i; current = (*this)(i); }
-          get_columns(i0,width() - 1).move_to(res);
-        } break;
-        case 'y' : {
-          int i0 = 0;
-          cimg_forY(*this,i)
-            if ((*this)(0,i)!=current) { get_rows(i0,i - 1).move_to(res); i0 = i; current = (*this)(0,i); }
-          get_rows(i0,height() - 1).move_to(res);
-        } break;
-        case 'z' : {
-          int i0 = 0;
-          cimg_forZ(*this,i)
-            if ((*this)(0,0,i)!=current) { get_slices(i0,i - 1).move_to(res); i0 = i; current = (*this)(0,0,i); }
-          get_slices(i0,depth() - 1).move_to(res);
-        } break;
-        case 'c' : {
-          int i0 = 0;
-          cimg_forC(*this,i)
-            if ((*this)(0,0,0,i)!=current) { get_channels(i0,i - 1).move_to(res); i0 = i; current = (*this)(0,0,0,i); }
-          get_channels(i0,spectrum() - 1).move_to(res);
-        } break;
-        default : {
-          longT i0 = 0;
-          cimg_foroff(*this,i)
-            if ((*this)[i]!=current) {
-              CImg<T>(_data + i0,1,(unsigned int)(i - i0)).move_to(res);
-              i0 = (longT)i; current = (*this)[i];
-            }
-          CImg<T>(_data + i0,1,(unsigned int)(size() - i0)).move_to(res);
-        }
-        }
-      }
-      return res;
-    }
-
-    //! Split image into a list of sub-images, according to a specified splitting value sequence and optionally axis.
-    /**
-       \param values Splitting value sequence.
-       \param axis Axis along which the splitting is performed. Can be '0' to ignore axis.
-       \param keep_values Tells if the splitting sequence must be kept in the splitted blocs.
-     **/
-    template<typename t>
-    CImgList<T> get_split(const CImg<t>& values, const char axis=0, const bool keep_values=true) const {
-      CImgList<T> res;
-      if (is_empty()) return res;
-      const ulongT vsiz = values.size();
-      const char _axis = cimg::lowercase(axis);
-      if (!vsiz) return CImgList<T>(*this);
-      if (vsiz==1) { // Split according to a single value.
-        const T value = (T)*values;
-        switch (_axis) {
-        case 'x' : {
-          unsigned int i0 = 0, i = 0;
-          do {
-            while (i<_width && (*this)(i)==value) ++i;
-            if (i>i0) { if (keep_values) get_columns(i0,i - 1).move_to(res); i0 = i; }
-            while (i<_width && (*this)(i)!=value) ++i;
-            if (i>i0) { get_columns(i0,i - 1).move_to(res); i0 = i; }
-          } while (i<_width);
-        } break;
-        case 'y' : {
-          unsigned int i0 = 0, i = 0;
-          do {
-            while (i<_height && (*this)(0,i)==value) ++i;
-            if (i>i0) { if (keep_values) get_rows(i0,i - 1).move_to(res); i0 = i; }
-            while (i<_height && (*this)(0,i)!=value) ++i;
-            if (i>i0) { get_rows(i0,i - 1).move_to(res); i0 = i; }
-          } while (i<_height);
-        } break;
-        case 'z' : {
-          unsigned int i0 = 0, i = 0;
-          do {
-            while (i<_depth && (*this)(0,0,i)==value) ++i;
-            if (i>i0) { if (keep_values) get_slices(i0,i - 1).move_to(res); i0 = i; }
-            while (i<_depth && (*this)(0,0,i)!=value) ++i;
-            if (i>i0) { get_slices(i0,i - 1).move_to(res); i0 = i; }
-          } while (i<_depth);
-        } break;
-        case 'c' : {
-          unsigned int i0 = 0, i = 0;
-          do {
-            while (i<_spectrum && (*this)(0,0,0,i)==value) ++i;
-            if (i>i0) { if (keep_values) get_channels(i0,i - 1).move_to(res); i0 = i; }
-            while (i<_spectrum && (*this)(0,0,0,i)!=value) ++i;
-            if (i>i0) { get_channels(i0,i - 1).move_to(res); i0 = i; }
-          } while (i<_spectrum);
-        } break;
-        default : {
-          const ulongT siz = size();
-          ulongT i0 = 0, i = 0;
-          do {
-            while (i<siz && (*this)[i]==value) ++i;
-            if (i>i0) { if (keep_values) CImg<T>(_data + i0,1,(unsigned int)(i - i0)).move_to(res); i0 = i; }
-            while (i<siz && (*this)[i]!=value) ++i;
-            if (i>i0) { CImg<T>(_data + i0,1,(unsigned int)(i - i0)).move_to(res); i0 = i; }
-          } while (i<siz);
-        }
-        }
-      } else { // Split according to multiple values.
-        ulongT j = 0;
-        switch (_axis) {
-        case 'x' : {
-          unsigned int i0 = 0, i1 = 0, i = 0;
-          do {
-            if ((*this)(i)==*values) {
-              i1 = i; j = 0;
-              while (i<_width && (*this)(i)==values[j]) { ++i; if (++j>=vsiz) j = 0; }
-              i-=j;
-              if (i>i1) {
-                if (i1>i0) get_columns(i0,i1 - 1).move_to(res);
-                if (keep_values) get_columns(i1,i - 1).move_to(res);
-                i0 = i;
-              } else ++i;
-            } else ++i;
-          } while (i<_width);
-          if (i0<_width) get_columns(i0,width() - 1).move_to(res);
-        } break;
-        case 'y' : {
-          unsigned int i0 = 0, i1 = 0, i = 0;
-          do {
-            if ((*this)(0,i)==*values) {
-              i1 = i; j = 0;
-              while (i<_height && (*this)(0,i)==values[j]) { ++i; if (++j>=vsiz) j = 0; }
-              i-=j;
-              if (i>i1) {
-                if (i1>i0) get_rows(i0,i1 - 1).move_to(res);
-                if (keep_values) get_rows(i1,i - 1).move_to(res);
-                i0 = i;
-              } else ++i;
-            } else ++i;
-          } while (i<_height);
-          if (i0<_height) get_rows(i0,height() - 1).move_to(res);
-        } break;
-        case 'z' : {
-          unsigned int i0 = 0, i1 = 0, i = 0;
-          do {
-            if ((*this)(0,0,i)==*values) {
-              i1 = i; j = 0;
-              while (i<_depth && (*this)(0,0,i)==values[j]) { ++i; if (++j>=vsiz) j = 0; }
-              i-=j;
-              if (i>i1) {
-                if (i1>i0) get_slices(i0,i1 - 1).move_to(res);
-                if (keep_values) get_slices(i1,i - 1).move_to(res);
-                i0 = i;
-              } else ++i;
-            } else ++i;
-          } while (i<_depth);
-          if (i0<_depth) get_slices(i0,depth() - 1).move_to(res);
-        } break;
-        case 'c' : {
-          unsigned int i0 = 0, i1 = 0, i = 0;
-          do {
-            if ((*this)(0,0,0,i)==*values) {
-              i1 = i; j = 0;
-              while (i<_spectrum && (*this)(0,0,0,i)==values[j]) { ++i; if (++j>=vsiz) j = 0; }
-              i-=j;
-              if (i>i1) {
-                if (i1>i0) get_channels(i0,i1 - 1).move_to(res);
-                if (keep_values) get_channels(i1,i - 1).move_to(res);
-                i0 = i;
-              } else ++i;
-            } else ++i;
-          } while (i<_spectrum);
-          if (i0<_spectrum) get_channels(i0,spectrum() - 1).move_to(res);
-        } break;
-        default : {
-          ulongT i0 = 0, i1 = 0, i = 0;
-          const ulongT siz = size();
-          do {
-            if ((*this)[i]==*values) {
-              i1 = i; j = 0;
-              while (i<siz && (*this)[i]==values[j]) { ++i; if (++j>=vsiz) j = 0; }
-              i-=j;
-              if (i>i1) {
-                if (i1>i0) CImg<T>(_data + i0,1,(unsigned int)(i1 - i0)).move_to(res);
-                if (keep_values) CImg<T>(_data + i1,1,(unsigned int)(i - i1)).move_to(res);
-                i0 = i;
-              } else ++i;
-            } else ++i;
-          } while (i<siz);
-          if (i0<siz) CImg<T>(_data + i0,1,(unsigned int)(siz - i0)).move_to(res);
-        } break;
-        }
-      }
-      return res;
-    }
-
-    //! Append two images along specified axis.
-    /**
-       \param img Image to append with instance image.
-       \param axis Appending axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param align Append alignment in \c [0,1].
-    **/
-    template<typename t>
-    CImg<T>& append(const CImg<t>& img, const char axis='x', const float align=0) {
-      if (is_empty()) return assign(img,false);
-      if (!img) return *this;
-      return CImgList<T>(*this,true).insert(img).get_append(axis,align).move_to(*this);
-    }
-
-    //! Append two images along specified axis \specialization.
-    CImg<T>& append(const CImg<T>& img, const char axis='x', const float align=0) {
-      if (is_empty()) return assign(img,false);
-      if (!img) return *this;
-      return CImgList<T>(*this,img,true).get_append(axis,align).move_to(*this);
-    }
-
-    //! Append two images along specified axis \const.
-    template<typename t>
-    CImg<_cimg_Tt> get_append(const CImg<T>& img, const char axis='x', const float align=0) const {
-      if (is_empty()) return +img;
-      if (!img) return +*this;
-      return CImgList<_cimg_Tt>(*this,true).insert(img).get_append(axis,align);
-    }
-
-    //! Append two images along specified axis \specialization.
-    CImg<T> get_append(const CImg<T>& img, const char axis='x', const float align=0) const {
-      if (is_empty()) return +img;
-      if (!img) return +*this;
-      return CImgList<T>(*this,img,true).get_append(axis,align);
-    }
-
-    //@}
-    //---------------------------------------
-    //
-    //! \name Filtering / Transforms
-    //@{
-    //---------------------------------------
-
-    //! Correlate image by a kernel.
-    /**
-       \param kernel = the correlation kernel.
-       \param boundary_conditions boundary conditions can be (false=dirichlet, true=neumann)
-       \param is_normalized = enable local normalization.
-       \note
-       - The correlation of the image instance \p *this by the kernel \p kernel is defined to be:
-       res(x,y,z) = sum_{i,j,k} (*this)(x + i,y + j,z + k)*kernel(i,j,k).
-    **/
-    template<typename t>
-    CImg<T>& correlate(const CImg<t>& kernel, const bool boundary_conditions=true,
-                       const bool is_normalized=false) {
-      if (is_empty() || !kernel) return *this;
-      return get_correlate(kernel,boundary_conditions,is_normalized).move_to(*this);
-    }
-
-    template<typename t>
-    CImg<_cimg_Ttfloat> get_correlate(const CImg<t>& kernel, const bool boundary_conditions=true,
-                                      const bool is_normalized=false) const {
-      return _correlate(kernel,boundary_conditions,is_normalized,false);
-    }
-
-    //! Correlate image by a kernel \newinstance.
-    template<typename t>
-    CImg<_cimg_Ttfloat> _correlate(const CImg<t>& kernel, const bool boundary_conditions,
-                                   const bool is_normalized, const bool is_convolution) const {
-      if (is_empty() || !kernel) return *this;
-      typedef _cimg_Ttfloat Ttfloat;
-      CImg<Ttfloat> res(_width,_height,_depth,std::max(_spectrum,kernel._spectrum));
-      cimg_abort_init;
-      if (boundary_conditions && kernel._width==kernel._height &&
-          ((kernel._depth==1 && kernel._width<=5) || (kernel._depth==kernel._width && kernel._width<=3))) {
-        // Special optimization done for 2x2, 3x3, 4x4, 5x5, 2x2x2 and 3x3x3 kernel (with boundary_conditions=true).
-        CImg<t> _kernel;
-        if (is_convolution) { // Add empty column/row/slice to shift kernel center in case of convolution
-          const int dw = !(kernel.width()%2), dh = !(kernel.height()%2), dd = !(kernel.depth()%2);
-          if (dw || dh || dd)
-            kernel.get_resize(kernel.width() + dw,kernel.height() + dh,kernel.depth() + dd,-100,0,0).
-              move_to(_kernel);
-        }
-        if (!_kernel) _kernel = kernel.get_shared();
-
-        Ttfloat *ptrd = res._data;
-        CImg<T> I;
-        switch (_kernel._depth) {
-        case 3 : {
-          I.assign(27);
-          cimg_forC(res,c) {
-            cimg_abort_test();
-            const CImg<T> _img = get_shared_channel(c%_spectrum);
-            const CImg<t> _K = _kernel.get_shared_channel(c%_kernel._spectrum);
-            if (is_normalized) {
-              const Ttfloat _M = (Ttfloat)_K.magnitude(2), M = _M*_M;
-              cimg_for3x3x3(_img,x,y,z,0,I,T) {
-                const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] +
-                                     I[ 3]*I[ 3] + I[ 4]*I[ 4] + I[ 5]*I[ 5] +
-                                     I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] +
-                                     I[ 9]*I[ 9] + I[10]*I[10] + I[11]*I[11] +
-                                     I[12]*I[12] + I[13]*I[13] + I[14]*I[14] +
-                                     I[15]*I[15] + I[16]*I[16] + I[17]*I[17] +
-                                     I[18]*I[18] + I[19]*I[19] + I[20]*I[20] +
-                                     I[21]*I[21] + I[22]*I[22] + I[23]*I[23] +
-                                     I[24]*I[24] + I[25]*I[25] + I[26]*I[26]);
-                *(ptrd++) = (Ttfloat)(N?(I[ 0]*_K[ 0] + I[ 1]*_K[ 1] + I[ 2]*_K[ 2] +
-                                         I[ 3]*_K[ 3] + I[ 4]*_K[ 4] + I[ 5]*_K[ 5] +
-                                         I[ 6]*_K[ 6] + I[ 7]*_K[ 7] + I[ 8]*_K[ 8] +
-                                         I[ 9]*_K[ 9] + I[10]*_K[10] + I[11]*_K[11] +
-                                         I[12]*_K[12] + I[13]*_K[13] + I[14]*_K[14] +
-                                         I[15]*_K[15] + I[16]*_K[16] + I[17]*_K[17] +
-                                         I[18]*_K[18] + I[19]*_K[19] + I[20]*_K[20] +
-                                         I[21]*_K[21] + I[22]*_K[22] + I[23]*_K[23] +
-                                         I[24]*_K[24] + I[25]*_K[25] + I[26]*_K[26])/std::sqrt(N):0);
-              }
-            } else cimg_for3x3x3(_img,x,y,z,0,I,T)
-                     *(ptrd++) = (Ttfloat)(I[ 0]*_K[ 0] + I[ 1]*_K[ 1] + I[ 2]*_K[ 2] +
-                                           I[ 3]*_K[ 3] + I[ 4]*_K[ 4] + I[ 5]*_K[ 5] +
-                                           I[ 6]*_K[ 6] + I[ 7]*_K[ 7] + I[ 8]*_K[ 8] +
-                                           I[ 9]*_K[ 9] + I[10]*_K[10] + I[11]*_K[11] +
-                                           I[12]*_K[12] + I[13]*_K[13] + I[14]*_K[14] +
-                                           I[15]*_K[15] + I[16]*_K[16] + I[17]*_K[17] +
-                                           I[18]*_K[18] + I[19]*_K[19] + I[20]*_K[20] +
-                                           I[21]*_K[21] + I[22]*_K[22] + I[23]*_K[23] +
-                                           I[24]*_K[24] + I[25]*_K[25] + I[26]*_K[26]);
-          }
-        } break;
-        case 2 : {
-          I.assign(8);
-          cimg_forC(res,c) {
-            cimg_abort_test();
-            const CImg<T> _img = get_shared_channel(c%_spectrum);
-            const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-            if (is_normalized) {
-              const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-              cimg_for2x2x2(_img,x,y,z,0,I,T) {
-                const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] +
-                                     I[2]*I[2] + I[3]*I[3] +
-                                     I[4]*I[4] + I[5]*I[5] +
-                                     I[6]*I[6] + I[7]*I[7]);
-                *(ptrd++) = (Ttfloat)(N?(I[0]*K[0] + I[1]*K[1] +
-                                         I[2]*K[2] + I[3]*K[3] +
-                                         I[4]*K[4] + I[5]*K[5] +
-                                         I[6]*K[6] + I[7]*K[7])/std::sqrt(N):0);
-              }
-            } else cimg_for2x2x2(_img,x,y,z,0,I,T)
-                     *(ptrd++) = (Ttfloat)(I[0]*K[0] + I[1]*K[1] +
-                                           I[2]*K[2] + I[3]*K[3] +
-                                           I[4]*K[4] + I[5]*K[5] +
-                                           I[6]*K[6] + I[7]*K[7]);
-          }
-        } break;
-        default :
-        case 1 :
-          switch (_kernel._width) {
-          case 6 : {
-            I.assign(36);
-            cimg_forC(res,c) {
-              cimg_abort_test();
-              const CImg<T> _img = get_shared_channel(c%_spectrum);
-              const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-              if (is_normalized) {
-                const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-                cimg_forZ(_img,z) cimg_for6x6(_img,x,y,z,0,I,T) {
-                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] + I[ 4]*I[ 4] +
-                                       I[ 5]*I[ 5] + I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] + I[ 9]*I[ 9] +
-                                       I[10]*I[10] + I[11]*I[11] + I[12]*I[12] + I[13]*I[13] + I[14]*I[14] +
-                                       I[15]*I[15] + I[16]*I[16] + I[17]*I[17] + I[18]*I[18] + I[19]*I[19] +
-                                       I[20]*I[20] + I[21]*I[21] + I[22]*I[22] + I[23]*I[23] + I[24]*I[24] +
-                                       I[25]*I[25] + I[26]*I[26] + I[27]*I[27] + I[28]*I[28] + I[29]*I[29] +
-                                       I[30]*I[30] + I[31]*I[31] + I[32]*I[32] + I[33]*I[33] + I[34]*I[34] +
-                                       I[35]*I[35]);
-                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                           I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                           I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                           I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15] +
-                                           I[16]*K[16] + I[17]*K[17] + I[18]*K[18] + I[19]*K[19] +
-                                           I[20]*K[20] + I[21]*K[21] + I[22]*K[22] + I[23]*K[23] +
-                                           I[24]*K[24] + I[25]*K[25] + I[26]*K[26] + I[27]*K[27] +
-                                           I[28]*K[28] + I[29]*K[29] + I[30]*K[30] + I[31]*K[31] +
-                                           I[32]*K[32] + I[33]*K[33] + I[34]*K[34] + I[35]*K[35])/
-                                        std::sqrt(N):0);
-                }
-              } else cimg_forZ(_img,z) cimg_for6x6(_img,x,y,z,0,I,T)
-                       *(ptrd++) = (Ttfloat)(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                             I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                             I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                             I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15] +
-                                             I[16]*K[16] + I[17]*K[17] + I[18]*K[18] + I[19]*K[19] +
-                                             I[20]*K[20] + I[21]*K[21] + I[22]*K[22] + I[23]*K[23] +
-                                             I[24]*K[24] + I[25]*K[25] + I[26]*K[26] + I[27]*K[27] +
-                                             I[28]*K[28] + I[29]*K[29] + I[30]*K[30] + I[31]*K[31] +
-                                             I[32]*K[32] + I[33]*K[33] + I[34]*K[34] + I[35]*K[35]);
-            }
-          } break;
-          case 5 : {
-            I.assign(25);
-            cimg_forC(res,c) {
-              cimg_abort_test();
-              const CImg<T> _img = get_shared_channel(c%_spectrum);
-              const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-              if (is_normalized) {
-                const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-                cimg_forZ(_img,z) cimg_for5x5(_img,x,y,z,0,I,T) {
-                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] + I[ 4]*I[ 4] +
-                                       I[ 5]*I[ 5] + I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] + I[ 9]*I[ 9] +
-                                       I[10]*I[10] + I[11]*I[11] + I[12]*I[12] + I[13]*I[13] + I[14]*I[14] +
-                                       I[15]*I[15] + I[16]*I[16] + I[17]*I[17] + I[18]*I[18] + I[19]*I[19] +
-                                       I[20]*I[20] + I[21]*I[21] + I[22]*I[22] + I[23]*I[23] + I[24]*I[24]);
-                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                           I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                           I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                           I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15] +
-                                           I[16]*K[16] + I[17]*K[17] + I[18]*K[18] + I[19]*K[19] +
-                                           I[20]*K[20] + I[21]*K[21] + I[22]*K[22] + I[23]*K[23] +
-                                           I[24]*K[24])/std::sqrt(N):0);
-                }
-              } else cimg_forZ(_img,z) cimg_for5x5(_img,x,y,z,0,I,T)
-                       *(ptrd++) = (Ttfloat)(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                             I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                             I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                             I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15] +
-                                             I[16]*K[16] + I[17]*K[17] + I[18]*K[18] + I[19]*K[19] +
-                                             I[20]*K[20] + I[21]*K[21] + I[22]*K[22] + I[23]*K[23] +
-                                             I[24]*K[24]);
-            }
-          } break;
-          case 4 : {
-            I.assign(16);
-            cimg_forC(res,c) {
-              cimg_abort_test();
-              const CImg<T> _img = get_shared_channel(c%_spectrum);
-              const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-              if (is_normalized) {
-                const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-                cimg_forZ(_img,z) cimg_for4x4(_img,x,y,z,0,I,T) {
-                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] +
-                                       I[ 4]*I[ 4] + I[ 5]*I[ 5] + I[ 6]*I[ 6] + I[ 7]*I[ 7] +
-                                       I[ 8]*I[ 8] + I[ 9]*I[ 9] + I[10]*I[10] + I[11]*I[11] +
-                                       I[12]*I[12] + I[13]*I[13] + I[14]*I[14] + I[15]*I[15]);
-                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                           I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                           I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                           I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15])/
-                                        std::sqrt(N):0);
-                }
-              } else cimg_forZ(_img,z) cimg_for4x4(_img,x,y,z,0,I,T)
-                       *(ptrd++) = (Ttfloat)(I[ 0]*K[ 0] + I[ 1]*K[ 1] + I[ 2]*K[ 2] + I[ 3]*K[ 3] +
-                                             I[ 4]*K[ 4] + I[ 5]*K[ 5] + I[ 6]*K[ 6] + I[ 7]*K[ 7] +
-                                             I[ 8]*K[ 8] + I[ 9]*K[ 9] + I[10]*K[10] + I[11]*K[11] +
-                                             I[12]*K[12] + I[13]*K[13] + I[14]*K[14] + I[15]*K[15]);
-            }
-          } break;
-          case 3 : {
-            I.assign(9);
-            cimg_forC(res,c) {
-              cimg_abort_test();
-              const CImg<T> _img = get_shared_channel(c%_spectrum);
-              const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-              if (is_normalized) {
-                const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-                cimg_forZ(_img,z) cimg_for3x3(_img,x,y,z,0,I,T) {
-                  const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] + I[2]*I[2] +
-                                       I[3]*I[3] + I[4]*I[4] + I[5]*I[5] +
-                                       I[6]*I[6] + I[7]*I[7] + I[8]*I[8]);
-                  *(ptrd++) = (Ttfloat)(N?(I[0]*K[0] + I[1]*K[1] + I[2]*K[2] +
-                                           I[3]*K[3] + I[4]*K[4] + I[5]*K[5] +
-                                           I[6]*K[6] + I[7]*K[7] + I[8]*K[8])/std::sqrt(N):0);
-                }
-              } else cimg_forZ(_img,z) cimg_for3x3(_img,x,y,z,0,I,T)
-                       *(ptrd++) = (Ttfloat)(I[0]*K[0] + I[1]*K[1] + I[2]*K[2] +
-                                             I[3]*K[3] + I[4]*K[4] + I[5]*K[5] +
-                                             I[6]*K[6] + I[7]*K[7] + I[8]*K[8]);
-            }
-          } break;
-          case 2 : {
-            I.assign(4);
-            cimg_forC(res,c) {
-              cimg_abort_test();
-              const CImg<T> _img = get_shared_channel(c%_spectrum);
-              const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-              if (is_normalized) {
-                const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-                cimg_forZ(_img,z) cimg_for2x2(_img,x,y,z,0,I,T) {
-                  const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] +
-                                       I[2]*I[2] + I[3]*I[3]);
-                  *(ptrd++) = (Ttfloat)(N?(I[0]*K[0] + I[1]*K[1] +
-                                           I[2]*K[2] + I[3]*K[3])/std::sqrt(N):0);
-                }
-              } else cimg_forZ(_img,z) cimg_for2x2(_img,x,y,z,0,I,T)
-                       *(ptrd++) = (Ttfloat)(I[0]*K[0] + I[1]*K[1] +
-                                             I[2]*K[2] + I[3]*K[3]);
-            }
-          } break;
-          case 1 :
-            if (is_normalized) res.fill(1);
-            else cimg_forC(res,c) {
-                cimg_abort_test();
-                const CImg<T> _img = get_shared_channel(c%_spectrum);
-                const CImg<t> K = _kernel.get_shared_channel(c%_kernel._spectrum);
-                res.get_shared_channel(c).assign(_img)*=K[0];
-              }
-            break;
-          }
-        }
-      } else { // Generic version for other kernels and boundary conditions.
-        int
-          mx2 = kernel.width()/2, my2 = kernel.height()/2, mz2 = kernel.depth()/2,
-          mx1 = kernel.width() - mx2 - 1, my1 = kernel.height() - my2 - 1, mz1 = kernel.depth() - mz2 - 1;
-        if (is_convolution) cimg::swap(mx1,mx2,my1,my2,mz1,mz2); // Shift kernel center in case of convolution
-        const int
-          mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
-        cimg_forC(res,c) cimg_abort_try {
-          cimg_abort_test();
-          const CImg<T> _img = get_shared_channel(c%_spectrum);
-          const CImg<t> K = kernel.get_shared_channel(c%kernel._spectrum);
-          if (is_normalized) { // Normalized correlation.
-            const Ttfloat _M = (Ttfloat)K.magnitude(2), M = _M*_M;
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=32768))
-            for (int z = mz1; z<mze; ++z)
-              for (int y = my1; y<mye; ++y)
-                for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                  cimg_abort_test2();
-                  Ttfloat val = 0, N = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm) {
-                        const Ttfloat _val = (Ttfloat)_img(x + xm,y + ym,z + zm);
-                        val+=_val*K(mx1 + xm,my1 + ym,mz1 + zm);
-                        N+=_val*_val;
-                      }
-                  N*=M;
-                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
-                } cimg_abort_catch2()
-            if (boundary_conditions)
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-              cimg_forYZ(res,y,z) cimg_abort_try2 {
-                cimg_abort_test2();
-                for (int x = 0; x<width();
-                     (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                  Ttfloat val = 0, N = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm) {
-                        const Ttfloat _val = (Ttfloat)_img._atXYZ(x + xm,y + ym,z + zm);
-                        val+=_val*K(mx1 + xm,my1 + ym,mz1 + zm);
-                        N+=_val*_val;
-                      }
-                  N*=M;
-                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
-                }
-              } cimg_abort_catch2()
-            else
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-              cimg_forYZ(res,y,z) cimg_abort_try2 {
-                cimg_abort_test2();
-                for (int x = 0; x<width();
-                     (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                  Ttfloat val = 0, N = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm) {
-                        const Ttfloat _val = (Ttfloat)_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0);
-                        val+=_val*K(mx1 + xm,my1 + ym,mz1 + zm);
-                        N+=_val*_val;
-                      }
-                  N*=M;
-                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
-                }
-              } cimg_abort_catch2()
-          } else { // Classical correlation.
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=32768))
-              for (int z = mz1; z<mze; ++z)
-              for (int y = my1; y<mye; ++y)
-                for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                  cimg_abort_test2();
-                  Ttfloat val = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm)
-                        val+=_img(x + xm,y + ym,z + zm)*K(mx1 + xm,my1 + ym,mz1 + zm);
-                  res(x,y,z,c) = (Ttfloat)val;
-                } cimg_abort_catch2()
-            if (boundary_conditions)
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-              cimg_forYZ(res,y,z) cimg_abort_try2 {
-                cimg_abort_test2();
-                for (int x = 0; x<width();
-                     (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                  Ttfloat val = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm)
-                        val+=_img._atXYZ(x + xm,y + ym,z + zm)*K(mx1 + xm,my1 + ym,mz1 + zm);
-                  res(x,y,z,c) = (Ttfloat)val;
-                }
-              } cimg_abort_catch2()
-            else
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-              cimg_forYZ(res,y,z) cimg_abort_try2 {
-                cimg_abort_test2();
-                for (int x = 0; x<width();
-                     (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                  Ttfloat val = 0;
-                  for (int zm = -mz1; zm<=mz2; ++zm)
-                    for (int ym = -my1; ym<=my2; ++ym)
-                      for (int xm = -mx1; xm<=mx2; ++xm)
-                        val+=_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0)*K(mx1 + xm,my1 + ym,mz1 + zm);
-                  res(x,y,z,c) = (Ttfloat)val;
-                }
-              } cimg_abort_catch2()
-          }
-        } cimg_abort_catch()
-      }
-      cimg_abort_test();
-      return res;
-    }
-
-    //! Convolve image by a kernel.
-    /**
-       \param kernel = the correlation kernel.
-       \param boundary_conditions boundary conditions can be (false=dirichlet, true=neumann)
-       \param is_normalized = enable local normalization.
-       \note
-       - The result \p res of the convolution of an image \p img by a kernel \p kernel is defined to be:
-       res(x,y,z) = sum_{i,j,k} img(x-i,y-j,z-k)*kernel(i,j,k)
-    **/
-    template<typename t>
-    CImg<T>& convolve(const CImg<t>& kernel, const bool boundary_conditions=true, const bool is_normalized=false) {
-      if (is_empty() || !kernel) return *this;
-      return get_convolve(kernel,boundary_conditions,is_normalized).move_to(*this);
-    }
-
-    //! Convolve image by a kernel \newinstance.
-    template<typename t>
-    CImg<_cimg_Ttfloat> get_convolve(const CImg<t>& kernel, const bool boundary_conditions=true,
-                                     const bool is_normalized=false) const {
-      return _correlate(CImg<t>(kernel._data,kernel.size(),1,1,1,true).get_mirror('x').
-                        resize(kernel,-1),boundary_conditions,is_normalized,true);
-    }
-
-    //! Cumulate image values, optionally along specified axis.
-    /**
-       \param axis Cumulation axis. Set it to 0 to cumulate all values globally without taking axes into account.
-    **/
-    CImg<T>& cumulate(const char axis=0) {
-      switch (cimg::lowercase(axis)) {
-      case 'x' :
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=512 && _height*_depth*_spectrum>=16))
-        cimg_forYZC(*this,y,z,c) {
-          T *ptrd = data(0,y,z,c);
-          Tlong cumul = (Tlong)0;
-          cimg_forX(*this,x) { cumul+=(Tlong)*ptrd; *(ptrd++) = (T)cumul; }
-        }
-        break;
-      case 'y' : {
-        const ulongT w = (ulongT)_width;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_height>=512 && _width*_depth*_spectrum>=16))
-        cimg_forXZC(*this,x,z,c) {
-          T *ptrd = data(x,0,z,c);
-          Tlong cumul = (Tlong)0;
-          cimg_forY(*this,y) { cumul+=(Tlong)*ptrd; *ptrd = (T)cumul; ptrd+=w; }
-        }
-      } break;
-      case 'z' : {
-        const ulongT wh = (ulongT)_width*_height;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_depth>=512 && _width*_depth*_spectrum>=16))
-        cimg_forXYC(*this,x,y,c) {
-          T *ptrd = data(x,y,0,c);
-          Tlong cumul = (Tlong)0;
-          cimg_forZ(*this,z) { cumul+=(Tlong)*ptrd; *ptrd = (T)cumul; ptrd+=wh; }
-        }
-      } break;
-      case 'c' : {
-        const ulongT whd = (ulongT)_width*_height*_depth;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_spectrum>=512 && _width*_height*_depth>=16))
-        cimg_forXYZ(*this,x,y,z) {
-          T *ptrd = data(x,y,z,0);
-          Tlong cumul = (Tlong)0;
-          cimg_forC(*this,c) { cumul+=(Tlong)*ptrd; *ptrd = (T)cumul; ptrd+=whd; }
-        }
-      } break;
-      default : { // Global cumulation.
-        Tlong cumul = (Tlong)0;
-        cimg_for(*this,ptrd,T) { cumul+=(Tlong)*ptrd; *ptrd = (T)cumul; }
-      }
-      }
-      return *this;
-    }
-
-    //! Cumulate image values, optionally along specified axis \newinstance.
-    CImg<Tlong> get_cumulate(const char axis=0) const {
-      return CImg<Tlong>(*this,false).cumulate(axis);
-    }
-
-    //! Cumulate image values, along specified axes.
-    /**
-       \param axes Cumulation axes, as a C-string.
-       \note \c axes may contains multiple characters, e.g. \c "xyz"
-    **/
-    CImg<T>& cumulate(const char *const axes) {
-      for (const char *s = axes; *s; ++s) cumulate(*s);
-      return *this;
-    }
-
-    //! Cumulate image values, along specified axes \newintance.
-    CImg<Tlong> get_cumulate(const char *const axes) const {
-      return CImg<Tlong>(*this,false).cumulate(axes);
-    }
-
-    //! Erode image by a structuring element.
-    /**
-       \param kernel Structuring element.
-       \param boundary_conditions Boundary conditions.
-       \param is_real Do the erosion in real (a.k.a 'non-flat') mode (\c true) rather than binary mode (\c false).
-    **/
-    template<typename t>
-    CImg<T>& erode(const CImg<t>& kernel, const bool boundary_conditions=true,
-                   const bool is_real=false) {
-      if (is_empty() || !kernel) return *this;
-      return get_erode(kernel,boundary_conditions,is_real).move_to(*this);
-    }
-
-    //! Erode image by a structuring element \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_erode(const CImg<t>& kernel, const bool boundary_conditions=true,
-                             const bool is_real=false) const {
-      if (is_empty() || !kernel) return *this;
-      if (!is_real && kernel==0) return CImg<T>(width(),height(),depth(),spectrum(),0);
-      typedef _cimg_Tt Tt;
-      CImg<Tt> res(_width,_height,_depth,std::max(_spectrum,kernel._spectrum));
-      const int
-        mx2 = kernel.width()/2, my2 = kernel.height()/2, mz2 = kernel.depth()/2,
-        mx1 = kernel.width() - mx2 - 1, my1 = kernel.height() - my2 - 1, mz1 = kernel.depth() - mz2 - 1,
-        mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
-      cimg_abort_init;
-      cimg_forC(*this,c) cimg_abort_try {
-        cimg_abort_test();
-        const CImg<T> _img = get_shared_channel(c%_spectrum);
-        const CImg<t> K = kernel.get_shared_channel(c%kernel._spectrum);
-        if (is_real) { // Real erosion
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=32768))
-          for (int z = mz1; z<mze; ++z)
-            for (int y = my1; y<mye; ++y)
-              for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                cimg_abort_test2();
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx1 + xm,my1 + ym,mz1 + zm);
-                      const Tt cval = (Tt)(_img(x + xm,y + ym,z + zm) - mval);
-                      if (cval<min_val) min_val = cval;
-                    }
-                res(x,y,z,c) = min_val;
-              } cimg_abort_catch2()
-          if (boundary_conditions)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx1 + xm,my1 + ym,mz1 + zm);
-                      const Tt cval = (Tt)(_img._atXYZ(x + xm,y + ym,z + zm) - mval);
-                      if (cval<min_val) min_val = cval;
-                    }
-                res(x,y,z,c) = min_val;
-              }
-            } cimg_abort_catch2()
-          else
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx1 + xm,my1 + ym,mz1 + zm);
-                      const Tt cval = (Tt)(_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0) - mval);
-                      if (cval<min_val) min_val = cval;
-                    }
-                res(x,y,z,c) = min_val;
-              }
-            } cimg_abort_catch2()
-
-        } else { // Binary erosion
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=32768))
-          for (int z = mz1; z<mze; ++z)
-            for (int y = my1; y<mye; ++y)
-              for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                cimg_abort_test2();
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx1 + xm,my1 + ym,mz1 + zm)) {
-                        const Tt cval = (Tt)_img(x + xm,y + ym,z + zm);
-                        if (cval<min_val) min_val = cval;
-                      }
-                res(x,y,z,c) = min_val;
-              } cimg_abort_catch2()
-          if (boundary_conditions)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx1 + xm,my1 + ym,mz1 + zm)) {
-                        const T cval = (Tt)_img._atXYZ(x + xm,y + ym,z + zm);
-                        if (cval<min_val) min_val = cval;
-                      }
-                res(x,y,z,c) = min_val;
-              }
-            } cimg_abort_catch2()
-          else
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt min_val = cimg::type<Tt>::max();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx1 + xm,my1 + ym,mz1 + zm)) {
-                        const T cval = (Tt)_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0);
-                        if (cval<min_val) min_val = cval;
-                      }
-                res(x,y,z,c) = min_val;
-              }
-            } cimg_abort_catch2()
-        }
-      } cimg_abort_catch()
-      cimg_abort_test();
-      return res;
-    }
-
-    //! Erode image by a rectangular structuring element of specified size.
-    /**
-       \param sx Width of the structuring element.
-       \param sy Height of the structuring element.
-       \param sz Depth of the structuring element.
-    **/
-    CImg<T>& erode(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) {
-      if (is_empty() || (sx==1 && sy==1 && sz==1)) return *this;
-      if (sx>1 && _width>1) { // Along X-axis.
-        const int L = width(), off = 1, s = (int)sx, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forYZC(*this,y,z,c) {
-          T *const ptrdb = buf._data, *ptrd = buf._data, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(0,y,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }}
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(0,y,z,c); cur = std::min(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val<cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(0,y,z,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-
-      if (sy>1 && _height>1) { // Along Y-axis.
-        const int L = height(), off = width(), s = (int)sy, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1,
-          s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forXZC(*this,x,z,c) {
-          T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(x,0,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }
-          }
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(x,0,z,c); cur = std::min(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val<cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(x,0,z,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-
-      if (sz>1 && _depth>1) { // Along Z-axis.
-        const int L = depth(), off = width()*height(), s = (int)sz, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1,
-          s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forXYC(*this,x,y,c) {
-          T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(x,y,0,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }
-          }
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(x,y,0,c); cur = std::min(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val<cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(x,y,0,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Erode image by a rectangular structuring element of specified size \newinstance.
-    CImg<T> get_erode(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) const {
-      return (+*this).erode(sx,sy,sz);
-    }
-
-    //! Erode the image by a square structuring element of specified size.
-    /**
-       \param s Size of the structuring element.
-    **/
-    CImg<T>& erode(const unsigned int s) {
-      return erode(s,s,s);
-    }
-
-    //! Erode the image by a square structuring element of specified size \newinstance.
-    CImg<T> get_erode(const unsigned int s) const {
-      return (+*this).erode(s);
-    }
-
-    //! Dilate image by a structuring element.
-    /**
-       \param kernel Structuring element.
-       \param boundary_conditions Boundary conditions.
-       \param is_real Do the dilation in real (a.k.a 'non-flat') mode (\c true) rather than binary mode (\c false).
-    **/
-    template<typename t>
-    CImg<T>& dilate(const CImg<t>& kernel, const bool boundary_conditions=true,
-                    const bool is_real=false) {
-      if (is_empty() || !kernel) return *this;
-      return get_dilate(kernel,boundary_conditions,is_real).move_to(*this);
-    }
-
-    //! Dilate image by a structuring element \newinstance.
-    template<typename t>
-    CImg<_cimg_Tt> get_dilate(const CImg<t>& kernel, const bool boundary_conditions=true,
-                              const bool is_real=false) const {
-      if (is_empty() || !kernel || (!is_real && kernel==0)) return *this;
-      typedef _cimg_Tt Tt;
-      CImg<Tt> res(_width,_height,_depth,_spectrum);
-      const int
-        mx1 = kernel.width()/2, my1 = kernel.height()/2, mz1 = kernel.depth()/2,
-        mx2 = kernel.width() - mx1 - 1, my2 = kernel.height() - my1 - 1, mz2 = kernel.depth() - mz1 - 1,
-        mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
-      cimg_abort_init;
-      cimg_forC(*this,c) cimg_abort_try {
-        cimg_abort_test();
-        const CImg<T> _img = get_shared_channel(c%_spectrum);
-        const CImg<t> K = kernel.get_shared_channel(c%kernel._spectrum);
-        if (is_real) { // Real dilation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=32768))
-          for (int z = mz1; z<mze; ++z)
-            for (int y = my1; y<mye; ++y)
-              for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                cimg_abort_test2();
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx2 - xm,my2 - ym,mz2 - zm);
-                      const Tt cval = (Tt)(_img(x + xm,y + ym,z + zm) + mval);
-                      if (cval>max_val) max_val = cval;
-                    }
-                res(x,y,z,c) = max_val;
-              } cimg_abort_catch2()
-          if (boundary_conditions)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx2 - xm,my2 - ym,mz2 - zm);
-                      const Tt cval = (Tt)(_img._atXYZ(x + xm,y + ym,z + zm) + mval);
-                      if (cval>max_val) max_val = cval;
-                    }
-                res(x,y,z,c) = max_val;
-              }
-            } cimg_abort_catch2()
-          else
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(*this,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm) {
-                      const t mval = K(mx2 - xm,my2 - ym,mz2 - zm);
-                      const Tt cval = (Tt)(_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0) + mval);
-                      if (cval>max_val) max_val = cval;
-                    }
-                res(x,y,z,c) = max_val;
-              }
-            } cimg_abort_catch2()
-        } else { // Binary dilation
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-          for (int z = mz1; z<mze; ++z)
-            for (int y = my1; y<mye; ++y)
-              for (int x = mx1; x<mxe; ++x) cimg_abort_try2 {
-                cimg_abort_test2();
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx2 - xm,my2 - ym,mz2 - zm)) {
-                        const Tt cval = (Tt)_img(x + xm,y + ym,z + zm);
-                        if (cval>max_val) max_val = cval;
-                      }
-                res(x,y,z,c) = max_val;
-              } cimg_abort_catch2()
-          if (boundary_conditions)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx2 - xm,my2 - ym,mz2 - zm)) {
-                        const T cval = (Tt)_img._atXYZ(x + xm,y + ym,z + zm);
-                        if (cval>max_val) max_val = cval;
-                      }
-                res(x,y,z,c) = max_val;
-              }
-            } cimg_abort_catch2()
-          else
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=128))
-            cimg_forYZ(res,y,z) cimg_abort_try2 {
-              cimg_abort_test2();
-              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1 - 1 || x>=mxe)?++x:(x=mxe))) {
-                Tt max_val = cimg::type<Tt>::min();
-                for (int zm = -mz1; zm<=mz2; ++zm)
-                  for (int ym = -my1; ym<=my2; ++ym)
-                    for (int xm = -mx1; xm<=mx2; ++xm)
-                      if (K(mx2 - xm,my2 - ym,mz2 - zm)) {
-                        const T cval = (Tt)_img.atXYZ(x + xm,y + ym,z + zm,0,(T)0);
-                        if (cval>max_val) max_val = cval;
-                      }
-                res(x,y,z,c) = max_val;
-              }
-            } cimg_abort_catch2()
-        }
-      } cimg_abort_catch()
-      cimg_abort_test();
-      return res;
-    }
-
-    //! Dilate image by a rectangular structuring element of specified size.
-    /**
-       \param sx Width of the structuring element.
-       \param sy Height of the structuring element.
-       \param sz Depth of the structuring element.
-    **/
-    CImg<T>& dilate(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) {
-      if (is_empty() || (sx==1 && sy==1 && sz==1)) return *this;
-      if (sx>1 && _width>1) { // Along X-axis.
-        const int L = width(), off = 1, s = (int)sx, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forYZC(*this,y,z,c) {
-          T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(0,y,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-          }
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(0,y,z,c); cur = std::max(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val>cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(0,y,z,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-
-      if (sy>1 && _height>1) { // Along Y-axis.
-        const int L = height(), off = width(), s = (int)sy, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1,
-          s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forXZC(*this,x,z,c) {
-          T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(x,0,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-          }
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(x,0,z,c); cur = std::max(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val>cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(x,0,z,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-
-      if (sz>1 && _depth>1) { // Along Z-axis.
-        const int L = depth(), off = width()*height(), s = (int)sz, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1,
-          s2 = _s2>L?L:_s2;
-        CImg<T> buf(L);
-        cimg_pragma_openmp(parallel for collapse(3) firstprivate(buf) if (size()>524288))
-        cimg_forXYC(*this,x,y,c) {
-          T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
-          const T *const ptrsb = data(x,y,0,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
-          T cur = *ptrs; ptrs+=off; bool is_first = true;
-          for (int p = s2 - 1; p>0 && ptrs<=ptrse; --p) {
-            const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-          }
-          *(ptrd++) = cur;
-          if (ptrs>=ptrse) {
-            T *pd = data(x,y,0,c); cur = std::max(cur,*ptrse); cimg_forX(buf,x) { *pd = cur; pd+=off; }
-          } else {
-            for (int p = s1; p>0 && ptrd<=ptrde; --p) {
-              const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; }
-              *(ptrd++) = cur;
-            }
-            for (int p = L - s - 1; p>0; --p) {
-              const T val = *ptrs; ptrs+=off;
-              if (is_first) {
-                const T *nptrs = ptrs - off; cur = val;
-                for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
-                nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
-              } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
-              *(ptrd++) = cur;
-            }
-            ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
-            for (int p = s1; p>0 && ptrs>=ptrsb; --p) {
-              const T val = *ptrs; ptrs-=off; if (val>cur) cur = val;
-            }
-            *(ptrd--) = cur;
-            for (int p = s2 - 1; p>0 && ptrd>=ptrdb; --p) {
-              const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur;
-            }
-            T *pd = data(x,y,0,c); cimg_for(buf,ps,T) { *pd = *ps; pd+=off; }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Dilate image by a rectangular structuring element of specified size \newinstance.
-    CImg<T> get_dilate(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) const {
-      return (+*this).dilate(sx,sy,sz);
-    }
-
-    //! Dilate image by a square structuring element of specified size.
-    /**
-       \param s Size of the structuring element.
-    **/
-    CImg<T>& dilate(const unsigned int s) {
-      return dilate(s,s,s);
-    }
-
-    //! Dilate image by a square structuring element of specified size \newinstance.
-    CImg<T> get_dilate(const unsigned int s) const {
-      return (+*this).dilate(s);
-    }
-
-    //! Compute watershed transform.
-    /**
-       \param priority Priority map.
-       \param is_high_connectivity Boolean that choose between 4(false)- or 8(true)-connectivity
-       in 2d case, and between 6(false)- or 26(true)-connectivity in 3d case.
-       \note Non-zero values of the instance instance are propagated to zero-valued ones according to
-       specified the priority map.
-    **/
-    template<typename t>
-    CImg<T>& watershed(const CImg<t>& priority, const bool is_high_connectivity=false) {
-#define _cimg_watershed_init(cond,X,Y,Z) \
-      if (cond && !(*this)(X,Y,Z)) Q._priority_queue_insert(labels,sizeQ,priority(X,Y,Z),X,Y,Z,nb_seeds)
-
-#define _cimg_watershed_propagate(cond,X,Y,Z) \
-      if (cond) { \
-        if ((*this)(X,Y,Z)) { \
-          ns = labels(X,Y,Z) - 1; xs = seeds(ns,0); ys = seeds(ns,1); zs = seeds(ns,2); \
-          d = cimg::sqr((float)x - xs) + cimg::sqr((float)y - ys) + cimg::sqr((float)z - zs); \
-          if (d<dmin) { dmin = d; nmin = ns; label = (*this)(xs,ys,zs); } \
-        } else Q._priority_queue_insert(labels,sizeQ,priority(X,Y,Z),X,Y,Z,n); \
-      }
-
-      if (is_empty()) return *this;
-      if (!is_sameXYZ(priority))
-        throw CImgArgumentException(_cimg_instance
-                                    "watershed(): image instance and specified priority (%u,%u,%u,%u,%p) "
-                                    "have different dimensions.",
-                                    cimg_instance,
-                                    priority._width,priority._height,priority._depth,priority._spectrum,priority._data);
-      if (_spectrum!=1) {
-        cimg_forC(*this,c)
-          get_shared_channel(c).watershed(priority.get_shared_channel(c%priority._spectrum));
-        return *this;
-      }
-
-      CImg<uintT> labels(_width,_height,_depth,1,0), seeds(64,3);
-      CImg<typename cimg::superset2<T,t,int>::type> Q;
-      unsigned int sizeQ = 0;
-      int px, nx, py, ny, pz, nz;
-      bool is_px, is_nx, is_py, is_ny, is_pz, is_nz;
-      const bool is_3d = _depth>1;
-
-      // Find seed points and insert them in priority queue.
-      unsigned int nb_seeds = 0;
-      const T *ptrs = _data;
-      cimg_forXYZ(*this,x,y,z) if (*(ptrs++)) { // 3d version
-        if (nb_seeds>=seeds._width) seeds.resize(2*seeds._width,3,1,1,0);
-        seeds(nb_seeds,0) = x; seeds(nb_seeds,1) = y; seeds(nb_seeds++,2) = z;
-        px = x - 1; nx = x + 1;
-        py = y - 1; ny = y + 1;
-        pz = z - 1; nz = z + 1;
-        is_px = px>=0; is_nx = nx<width();
-        is_py = py>=0; is_ny = ny<height();
-        is_pz = pz>=0; is_nz = nz<depth();
-        _cimg_watershed_init(is_px,px,y,z);
-        _cimg_watershed_init(is_nx,nx,y,z);
-        _cimg_watershed_init(is_py,x,py,z);
-        _cimg_watershed_init(is_ny,x,ny,z);
-        if (is_3d) {
-          _cimg_watershed_init(is_pz,x,y,pz);
-          _cimg_watershed_init(is_nz,x,y,nz);
-        }
-        if (is_high_connectivity) {
-          _cimg_watershed_init(is_px && is_py,px,py,z);
-          _cimg_watershed_init(is_nx && is_py,nx,py,z);
-          _cimg_watershed_init(is_px && is_ny,px,ny,z);
-          _cimg_watershed_init(is_nx && is_ny,nx,ny,z);
-          if (is_3d) {
-            _cimg_watershed_init(is_px && is_pz,px,y,pz);
-            _cimg_watershed_init(is_nx && is_pz,nx,y,pz);
-            _cimg_watershed_init(is_px && is_nz,px,y,nz);
-            _cimg_watershed_init(is_nx && is_nz,nx,y,nz);
-            _cimg_watershed_init(is_py && is_pz,x,py,pz);
-            _cimg_watershed_init(is_ny && is_pz,x,ny,pz);
-            _cimg_watershed_init(is_py && is_nz,x,py,nz);
-            _cimg_watershed_init(is_ny && is_nz,x,ny,nz);
-            _cimg_watershed_init(is_px && is_py && is_pz,px,py,pz);
-            _cimg_watershed_init(is_nx && is_py && is_pz,nx,py,pz);
-            _cimg_watershed_init(is_px && is_ny && is_pz,px,ny,pz);
-            _cimg_watershed_init(is_nx && is_ny && is_pz,nx,ny,pz);
-            _cimg_watershed_init(is_px && is_py && is_nz,px,py,nz);
-            _cimg_watershed_init(is_nx && is_py && is_nz,nx,py,nz);
-            _cimg_watershed_init(is_px && is_ny && is_nz,px,ny,nz);
-            _cimg_watershed_init(is_nx && is_ny && is_nz,nx,ny,nz);
-          }
-        }
-        labels(x,y,z) = nb_seeds;
-      }
-
-      // Start watershed computation.
-      while (sizeQ) {
-
-        // Get and remove point with maximal priority from the queue.
-        const int x = (int)Q(0,1), y = (int)Q(0,2), z = (int)Q(0,3);
-        const unsigned int n = labels(x,y,z);
-        px = x - 1; nx = x + 1;
-        py = y - 1; ny = y + 1;
-        pz = z - 1; nz = z + 1;
-        is_px = px>=0; is_nx = nx<width();
-        is_py = py>=0; is_ny = ny<height();
-        is_pz = pz>=0; is_nz = nz<depth();
-
-        // Check labels of the neighbors.
-        Q._priority_queue_remove(sizeQ);
-
-        unsigned int xs, ys, zs, ns, nmin = 0;
-        float d, dmin = cimg::type<float>::inf();
-        T label = (T)0;
-        _cimg_watershed_propagate(is_px,px,y,z);
-        _cimg_watershed_propagate(is_nx,nx,y,z);
-        _cimg_watershed_propagate(is_py,x,py,z);
-        _cimg_watershed_propagate(is_ny,x,ny,z);
-        if (is_3d) {
-          _cimg_watershed_propagate(is_pz,x,y,pz);
-          _cimg_watershed_propagate(is_nz,x,y,nz);
-        }
-        if (is_high_connectivity) {
-          _cimg_watershed_propagate(is_px && is_py,px,py,z);
-          _cimg_watershed_propagate(is_nx && is_py,nx,py,z);
-          _cimg_watershed_propagate(is_px && is_ny,px,ny,z);
-          _cimg_watershed_propagate(is_nx && is_ny,nx,ny,z);
-          if (is_3d) {
-            _cimg_watershed_propagate(is_px && is_pz,px,y,pz);
-            _cimg_watershed_propagate(is_nx && is_pz,nx,y,pz);
-            _cimg_watershed_propagate(is_px && is_nz,px,y,nz);
-            _cimg_watershed_propagate(is_nx && is_nz,nx,y,nz);
-            _cimg_watershed_propagate(is_py && is_pz,x,py,pz);
-            _cimg_watershed_propagate(is_ny && is_pz,x,ny,pz);
-            _cimg_watershed_propagate(is_py && is_nz,x,py,nz);
-            _cimg_watershed_propagate(is_ny && is_nz,x,ny,nz);
-            _cimg_watershed_propagate(is_px && is_py && is_pz,px,py,pz);
-            _cimg_watershed_propagate(is_nx && is_py && is_pz,nx,py,pz);
-            _cimg_watershed_propagate(is_px && is_ny && is_pz,px,ny,pz);
-            _cimg_watershed_propagate(is_nx && is_ny && is_pz,nx,ny,pz);
-            _cimg_watershed_propagate(is_px && is_py && is_nz,px,py,nz);
-            _cimg_watershed_propagate(is_nx && is_py && is_nz,nx,py,nz);
-            _cimg_watershed_propagate(is_px && is_ny && is_nz,px,ny,nz);
-            _cimg_watershed_propagate(is_nx && is_ny && is_nz,nx,ny,nz);
-          }
-        }
-        (*this)(x,y,z) = label;
-        labels(x,y,z) = ++nmin;
-      }
-      return *this;
-    }
-
-    //! Compute watershed transform \newinstance.
-    template<typename t>
-    CImg<T> get_watershed(const CImg<t>& priority, const bool is_high_connectivity=false) const {
-      return (+*this).watershed(priority,is_high_connectivity);
-    }
-
-    // [internal] Insert/Remove items in priority queue, for watershed/distance transforms.
-    template<typename tq, typename tv>
-    bool _priority_queue_insert(CImg<tq>& is_queued, unsigned int& siz, const tv value,
-                                const unsigned int x, const unsigned int y, const unsigned int z,
-                                const unsigned int n=1) {
-      if (is_queued(x,y,z)) return false;
-      is_queued(x,y,z) = (tq)n;
-      if (++siz>=_width) { if (!is_empty()) resize(_width*2,4,1,1,0); else assign(64,4); }
-      (*this)(siz - 1,0) = (T)value;
-      (*this)(siz - 1,1) = (T)x;
-      (*this)(siz - 1,2) = (T)y;
-      (*this)(siz - 1,3) = (T)z;
-      for (unsigned int pos = siz - 1, par = 0; pos && value>(*this)(par=(pos + 1)/2 - 1,0); pos = par) {
-        cimg::swap((*this)(pos,0),(*this)(par,0));
-        cimg::swap((*this)(pos,1),(*this)(par,1));
-        cimg::swap((*this)(pos,2),(*this)(par,2));
-        cimg::swap((*this)(pos,3),(*this)(par,3));
-      }
-      return true;
-    }
-
-    CImg<T>& _priority_queue_remove(unsigned int& siz) {
-      (*this)(0,0) = (*this)(--siz,0);
-      (*this)(0,1) = (*this)(siz,1);
-      (*this)(0,2) = (*this)(siz,2);
-      (*this)(0,3) = (*this)(siz,3);
-      const float value = (*this)(0,0);
-      for (unsigned int pos = 0, left = 0, right = 0;
-           ((right=2*(pos + 1),(left=right - 1))<siz && value<(*this)(left,0)) ||
-             (right<siz && value<(*this)(right,0));) {
-        if (right<siz) {
-          if ((*this)(left,0)>(*this)(right,0)) {
-            cimg::swap((*this)(pos,0),(*this)(left,0));
-            cimg::swap((*this)(pos,1),(*this)(left,1));
-            cimg::swap((*this)(pos,2),(*this)(left,2));
-            cimg::swap((*this)(pos,3),(*this)(left,3));
-            pos = left;
-          } else {
-            cimg::swap((*this)(pos,0),(*this)(right,0));
-            cimg::swap((*this)(pos,1),(*this)(right,1));
-            cimg::swap((*this)(pos,2),(*this)(right,2));
-            cimg::swap((*this)(pos,3),(*this)(right,3));
-            pos = right;
-          }
-        } else {
-          cimg::swap((*this)(pos,0),(*this)(left,0));
-          cimg::swap((*this)(pos,1),(*this)(left,1));
-          cimg::swap((*this)(pos,2),(*this)(left,2));
-          cimg::swap((*this)(pos,3),(*this)(left,3));
-          pos = left;
-        }
-      }
-      return *this;
-    }
-
-    //! Apply recursive Deriche filter.
-    /**
-       \param sigma Standard deviation of the filter.
-       \param order Order of the filter. Can be <tt>{ 0=smooth-filter | 1=1st-derivative | 2=2nd-derivative }</tt>.
-       \param axis Axis along which the filter is computed. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.
-    **/
-    CImg<T>& deriche(const float sigma, const unsigned int order=0, const char axis='x',
-                     const bool boundary_conditions=true) {
-#define _cimg_deriche_apply \
-  CImg<Tfloat> Y(N); \
-  Tfloat *ptrY = Y._data, yb = 0, yp = 0; \
-  T xp = (T)0; \
-  if (boundary_conditions) { xp = *ptrX; yb = yp = (Tfloat)(coefp*xp); } \
-  for (int m = 0; m<N; ++m) { \
-    const T xc = *ptrX; ptrX+=off; \
-    const Tfloat yc = *(ptrY++) = (Tfloat)(a0*xc + a1*xp - b1*yp - b2*yb); \
-    xp = xc; yb = yp; yp = yc; \
-  } \
-  T xn = (T)0, xa = (T)0; \
-  Tfloat yn = 0, ya = 0; \
-  if (boundary_conditions) { xn = xa = *(ptrX-off); yn = ya = (Tfloat)coefn*xn; } \
-  for (int n = N - 1; n>=0; --n) { \
-    const T xc = *(ptrX-=off); \
-    const Tfloat yc = (Tfloat)(a2*xn + a3*xa - b1*yn - b2*ya); \
-    xa = xn; xn = xc; ya = yn; yn = yc; \
-    *ptrX = (T)(*(--ptrY)+yc); \
-  }
-      const char naxis = cimg::lowercase(axis);
-      const float nsigma = sigma>=0?sigma:-sigma*(naxis=='x'?_width:naxis=='y'?_height:naxis=='z'?_depth:_spectrum)/100;
-      if (is_empty() || (nsigma<0.1f && !order)) return *this;
-      const float
-        nnsigma = nsigma<0.1f?0.1f:nsigma,
-        alpha = 1.695f/nnsigma,
-        ema = (float)std::exp(-alpha),
-        ema2 = (float)std::exp(-2*alpha),
-        b1 = -2*ema,
-        b2 = ema2;
-      float a0 = 0, a1 = 0, a2 = 0, a3 = 0, coefp = 0, coefn = 0;
-      switch (order) {
-      case 0 : {
-        const float k = (1-ema)*(1-ema)/(1 + 2*alpha*ema-ema2);
-        a0 = k;
-        a1 = k*(alpha - 1)*ema;
-        a2 = k*(alpha + 1)*ema;
-        a3 = -k*ema2;
-      } break;
-      case 1 : {
-        const float k = -(1-ema)*(1-ema)*(1-ema)/(2*(ema + 1)*ema);
-        a0 = a3 = 0;
-        a1 = k*ema;
-        a2 = -a1;
-      } break;
-      case 2 : {
-        const float
-          ea = (float)std::exp(-alpha),
-          k = -(ema2 - 1)/(2*alpha*ema),
-          kn = (-2*(-1 + 3*ea - 3*ea*ea + ea*ea*ea)/(3*ea + 1 + 3*ea*ea + ea*ea*ea));
-        a0 = kn;
-        a1 = -kn*(1 + k*alpha)*ema;
-        a2 = kn*(1 - k*alpha)*ema;
-        a3 = -kn*ema2;
-      } break;
-      default :
-        throw CImgArgumentException(_cimg_instance
-                                    "deriche(): Invalid specified filter order %u "
-                                    "(should be { 0=smoothing | 1=1st-derivative | 2=2nd-derivative }).",
-                                    cimg_instance,
-                                    order);
-      }
-      coefp = (a0 + a1)/(1 + b1 + b2);
-      coefn = (a2 + a3)/(1 + b1 + b2);
-      switch (naxis) {
-      case 'x' : {
-        const int N = width();
-        const ulongT off = 1U;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forYZC(*this,y,z,c) { T *ptrX = data(0,y,z,c); _cimg_deriche_apply; }
-      } break;
-      case 'y' : {
-        const int N = height();
-        const ulongT off = (ulongT)_width;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXZC(*this,x,z,c) { T *ptrX = data(x,0,z,c); _cimg_deriche_apply; }
-      } break;
-      case 'z' : {
-        const int N = depth();
-        const ulongT off = (ulongT)_width*_height;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYC(*this,x,y,c) { T *ptrX = data(x,y,0,c); _cimg_deriche_apply; }
-      } break;
-      default : {
-        const int N = spectrum();
-        const ulongT off = (ulongT)_width*_height*_depth;
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYZ(*this,x,y,z) { T *ptrX = data(x,y,z,0); _cimg_deriche_apply; }
-      }
-      }
-      return *this;
-    }
-
-    //! Apply recursive Deriche filter \newinstance.
-    CImg<Tfloat> get_deriche(const float sigma, const unsigned int order=0, const char axis='x',
-                             const bool boundary_conditions=true) const {
-      return CImg<Tfloat>(*this,false).deriche(sigma,order,axis,boundary_conditions);
-    }
-
-    // [internal] Apply a recursive filter (used by CImg<T>::vanvliet()).
-    /*
-       \param ptr the pointer of the data
-       \param filter the coefficient of the filter in the following order [n,n - 1,n - 2,n - 3].
-       \param N size of the data
-       \param off the offset between two data point
-       \param order the order of the filter 0 (smoothing), 1st derivtive, 2nd derivative, 3rd derivative
-       \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.
-       \note Boundary condition using B. Triggs method (IEEE trans on Sig Proc 2005).
-    */
-    static void _cimg_recursive_apply(T *data, const double filter[], const int N, const ulongT off,
-                                      const unsigned int order, const bool boundary_conditions) {
-      double val[4] = { 0 };  // res[n,n - 1,n - 2,n - 3,..] or res[n,n + 1,n + 2,n + 3,..]
-      const double
-        sumsq = filter[0], sum = sumsq * sumsq,
-        a1 = filter[1], a2 = filter[2], a3 = filter[3],
-        scaleM = 1.0 / ( (1.0 + a1 - a2 + a3) * (1.0 - a1 - a2 - a3) * (1.0 + a2 + (a1 - a3) * a3) );
-      double M[9]; // Triggs matrix
-      M[0] = scaleM * (-a3 * a1 + 1.0 - a3 * a3 - a2);
-      M[1] = scaleM * (a3 + a1) * (a2 + a3 * a1);
-      M[2] = scaleM * a3 * (a1 + a3 * a2);
-      M[3] = scaleM * (a1 + a3 * a2);
-      M[4] = -scaleM * (a2 - 1.0) * (a2 + a3 * a1);
-      M[5] = -scaleM * a3 * (a3 * a1 + a3 * a3 + a2 - 1.0);
-      M[6] = scaleM * (a3 * a1 + a2 + a1 * a1 - a2 * a2);
-      M[7] = scaleM * (a1 * a2 + a3 * a2 * a2 - a1 * a3 * a3 - a3 * a3 * a3 - a3 * a2 + a3);
-      M[8] = scaleM * a3 * (a1 + a3 * a2);
-      switch (order) {
-      case 0 : {
-        const double iplus = (boundary_conditions?data[(N - 1)*off]:(T)0);
-        for (int pass = 0; pass<2; ++pass) {
-          if (!pass) {
-            for (int k = 1; k<4; ++k) val[k] = (boundary_conditions?*data/sumsq:0);
-          } else {
-            // apply Triggs boundary conditions
-            const double
-              uplus = iplus/(1.0 - a1 - a2 - a3), vplus = uplus/(1.0 - a1 - a2 - a3),
-              unp  = val[1] - uplus, unp1 = val[2] - uplus, unp2 = val[3] - uplus;
-            val[0] = (M[0] * unp + M[1] * unp1 + M[2] * unp2 + vplus) * sum;
-            val[1] = (M[3] * unp + M[4] * unp1 + M[5] * unp2 + vplus) * sum;
-            val[2] = (M[6] * unp + M[7] * unp1 + M[8] * unp2 + vplus) * sum;
-            *data = (T)val[0];
-            data -= off;
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          for (int n = pass; n<N; ++n) {
-            val[0] = (*data);
-            if (pass) val[0] *= sum;
-            for (int k = 1; k<4; ++k) val[0] += val[k] * filter[k];
-            *data = (T)val[0];
-            if (!pass) data += off; else data -= off;
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          if (!pass) data -= off;
-        }
-      } break;
-      case 1 : {
-        double x[3]; // [front,center,back]
-        for (int pass = 0; pass<2; ++pass) {
-          if (!pass) {
-            for (int k = 0; k<3; ++k) x[k] = (boundary_conditions?*data:(T)0);
-            for (int k = 0; k<4; ++k) val[k] = 0;
-          } else {
-            // apply Triggs boundary conditions
-            const double
-              unp  = val[1], unp1 = val[2], unp2 = val[3];
-            val[0] = (M[0] * unp + M[1] * unp1 + M[2] * unp2) * sum;
-            val[1] = (M[3] * unp + M[4] * unp1 + M[5] * unp2) * sum;
-            val[2] = (M[6] * unp + M[7] * unp1 + M[8] * unp2) * sum;
-            *data = (T)val[0];
-            data -= off;
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          for (int n = pass; n<N - 1; ++n) {
-            if (!pass) {
-              x[0] = *(data + off);
-              val[0] = 0.5f * (x[0] - x[2]);
-            } else val[0] = (*data) * sum;
-            for (int k = 1; k<4; ++k) val[0] += val[k] * filter[k];
-            *data = (T)val[0];
-            if (!pass) {
-              data += off;
-              for (int k = 2; k>0; --k) x[k] = x[k - 1];
-            } else { data-=off;}
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          *data = (T)0;
-        }
-      } break;
-      case 2: {
-        double x[3]; // [front,center,back]
-        for (int pass = 0; pass<2; ++pass) {
-          if (!pass) {
-            for (int k = 0; k<3; ++k) x[k] = (boundary_conditions?*data:(T)0);
-            for (int k = 0; k<4; ++k) val[k] = 0;
-          } else {
-            // apply Triggs boundary conditions
-            const double
-              unp  = val[1], unp1 = val[2], unp2 = val[3];
-            val[0] = (M[0] * unp + M[1] * unp1 + M[2] * unp2) * sum;
-            val[1] = (M[3] * unp + M[4] * unp1 + M[5] * unp2) * sum;
-            val[2] = (M[6] * unp + M[7] * unp1 + M[8] * unp2) * sum;
-            *data = (T)val[0];
-            data -= off;
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          for (int n = pass; n<N - 1; ++n) {
-            if (!pass) { x[0] = *(data + off); val[0] = (x[1] - x[2]); }
-            else { x[0] = *(data - off); val[0] = (x[2] - x[1]) * sum; }
-            for (int k = 1; k<4; ++k) val[0] += val[k]*filter[k];
-            *data = (T)val[0];
-            if (!pass) data += off; else data -= off;
-            for (int k = 2; k>0; --k) x[k] = x[k - 1];
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          *data = (T)0;
-        }
-      } break;
-      case 3: {
-        double x[3]; // [front,center,back]
-        for (int pass = 0; pass<2; ++pass) {
-          if (!pass) {
-            for (int k = 0; k<3; ++k) x[k] = (boundary_conditions?*data:(T)0);
-            for (int k = 0; k<4; ++k) val[k] = 0;
-          } else {
-            // apply Triggs boundary conditions
-            const double
-              unp = val[1], unp1 = val[2], unp2 = val[3];
-            val[0] = (M[0] * unp + M[1] * unp1 + M[2] * unp2) * sum;
-            val[1] = (M[3] * unp + M[4] * unp1 + M[5] * unp2) * sum;
-            val[2] = (M[6] * unp + M[7] * unp1 + M[8] * unp2) * sum;
-            *data = (T)val[0];
-            data -= off;
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          for (int n = pass; n<N - 1; ++n) {
-            if (!pass) { x[0] = *(data + off); val[0] = (x[0] - 2*x[1] + x[2]); }
-            else { x[0] = *(data - off); val[0] = 0.5f * (x[2] - x[0]) * sum; }
-            for (int k = 1; k<4; ++k) val[0] += val[k] * filter[k];
-            *data = (T)val[0];
-            if (!pass) data += off; else data -= off;
-            for (int k = 2; k>0; --k) x[k] = x[k - 1];
-            for (int k = 3; k>0; --k) val[k] = val[k - 1];
-          }
-          *data = (T)0;
-        }
-      } break;
-      }
-    }
-
-    //! Van Vliet recursive Gaussian filter.
-    /**
-       \param sigma standard deviation of the Gaussian filter
-       \param order the order of the filter 0,1,2,3
-       \param axis  Axis along which the filter is computed. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.
-       \note dirichlet boundary condition has a strange behavior
-
-       I.T. Young, L.J. van Vliet, M. van Ginkel, Recursive Gabor filtering.
-       IEEE Trans. Sig. Proc., vol. 50, pp. 2799-2805, 2002.
-
-       (this is an improvement over Young-Van Vliet, Sig. Proc. 44, 1995)
-
-       Boundary conditions (only for order 0) using Triggs matrix, from
-       B. Triggs and M. Sdika. Boundary conditions for Young-van Vliet
-       recursive filtering. IEEE Trans. Signal Processing,
-       vol. 54, pp. 2365-2367, 2006.
-    **/
-    CImg<T>& vanvliet(const float sigma, const unsigned int order, const char axis='x',
-                      const bool boundary_conditions=true) {
-      if (is_empty()) return *this;
-      const char naxis = cimg::lowercase(axis);
-      const float nsigma = sigma>=0?sigma:-sigma*(naxis=='x'?_width:naxis=='y'?_height:naxis=='z'?_depth:_spectrum)/100;
-      if (is_empty() || (nsigma<0.5f && !order)) return *this;
-      const double
-        nnsigma = nsigma<0.5f?0.5f:nsigma,
-        m0 = 1.16680, m1 = 1.10783, m2 = 1.40586,
-        m1sq = m1 * m1, m2sq = m2 * m2,
-        q = (nnsigma<3.556?-0.2568 + 0.5784*nnsigma + 0.0561*nnsigma*nnsigma:2.5091 + 0.9804*(nnsigma - 3.556)),
-        qsq = q * q,
-        scale = (m0 + q) * (m1sq + m2sq + 2 * m1 * q + qsq),
-        b1 = -q * (2 * m0 * m1 + m1sq + m2sq + (2 * m0 + 4 * m1) * q + 3 * qsq) / scale,
-        b2 = qsq * (m0 + 2 * m1 + 3 * q) / scale,
-        b3 = -qsq * q / scale,
-        B = ( m0 * (m1sq + m2sq) ) / scale;
-      double filter[4];
-      filter[0] = B; filter[1] = -b1; filter[2] = -b2; filter[3] = -b3;
-      switch (naxis) {
-      case 'x' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forYZC(*this,y,z,c)
-          _cimg_recursive_apply(data(0,y,z,c),filter,_width,1U,order,boundary_conditions);
-      } break;
-      case 'y' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXZC(*this,x,z,c)
-          _cimg_recursive_apply(data(x,0,z,c),filter,_height,(ulongT)_width,order,boundary_conditions);
-      } break;
-      case 'z' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYC(*this,x,y,c)
-          _cimg_recursive_apply(data(x,y,0,c),filter,_depth,(ulongT)_width*_height,
-                                order,boundary_conditions);
-      } break;
-      default : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYZ(*this,x,y,z)
-          _cimg_recursive_apply(data(x,y,z,0),filter,_spectrum,(ulongT)_width*_height*_depth,
-                                order,boundary_conditions);
-      }
-      }
-      return *this;
-    }
-
-    //! Blur image using Van Vliet recursive Gaussian filter. \newinstance.
-    CImg<Tfloat> get_vanvliet(const float sigma, const unsigned int order, const char axis='x',
-                              const bool boundary_conditions=true) const {
-      return CImg<Tfloat>(*this,false).vanvliet(sigma,order,axis,boundary_conditions);
-    }
-
-    //! Blur image.
-    /**
-       \param sigma_x Standard deviation of the blur, along the X-axis.
-       \param sigma_y Standard deviation of the blur, along the Y-axis.
-       \param sigma_z Standard deviation of the blur, along the Z-axis.
-       \param boundary_conditions Boundary conditions. Can be <tt>{ false=dirichlet | true=neumann }</tt>.
-       \param is_gaussian Tells if the blur uses a gaussian (\c true) or quasi-gaussian (\c false) kernel.
-       \note
-       - The blur is computed as a 0-order Deriche filter. This is not a gaussian blur.
-       - This is a recursive algorithm, not depending on the values of the standard deviations.
-       \see deriche(), vanvliet().
-    **/
-    CImg<T>& blur(const float sigma_x, const float sigma_y, const float sigma_z,
-                  const bool boundary_conditions=true, const bool is_gaussian=false) {
-      if (is_empty()) return *this;
-      if (is_gaussian) {
-        if (_width>1) vanvliet(sigma_x,0,'x',boundary_conditions);
-        if (_height>1) vanvliet(sigma_y,0,'y',boundary_conditions);
-        if (_depth>1) vanvliet(sigma_z,0,'z',boundary_conditions);
-      } else {
-        if (_width>1) deriche(sigma_x,0,'x',boundary_conditions);
-        if (_height>1) deriche(sigma_y,0,'y',boundary_conditions);
-        if (_depth>1) deriche(sigma_z,0,'z',boundary_conditions);
-      }
-      return *this;
-    }
-
-    //! Blur image \newinstance.
-    CImg<Tfloat> get_blur(const float sigma_x, const float sigma_y, const float sigma_z,
-                          const bool boundary_conditions=true, const bool is_gaussian=false) const {
-      return CImg<Tfloat>(*this,false).blur(sigma_x,sigma_y,sigma_z,boundary_conditions,is_gaussian);
-    }
-
-    //! Blur image isotropically.
-    /**
-       \param sigma Standard deviation of the blur.
-       \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.a
-       \see deriche(), vanvliet().
-    **/
-    CImg<T>& blur(const float sigma, const bool boundary_conditions=true, const bool is_gaussian=false) {
-      const float nsigma = sigma>=0?sigma:-sigma*cimg::max(_width,_height,_depth)/100;
-      return blur(nsigma,nsigma,nsigma,boundary_conditions,is_gaussian);
-    }
-
-    //! Blur image isotropically \newinstance.
-    CImg<Tfloat> get_blur(const float sigma, const bool boundary_conditions=true, const bool is_gaussian=false) const {
-      return CImg<Tfloat>(*this,false).blur(sigma,boundary_conditions,is_gaussian);
-    }
-
-    //! Blur image anisotropically, directed by a field of diffusion tensors.
-    /**
-       \param G Field of square roots of diffusion tensors/vectors used to drive the smoothing.
-       \param amplitude Amplitude of the smoothing.
-       \param dl Spatial discretization.
-       \param da Angular discretization.
-       \param gauss_prec Precision of the diffusion process.
-       \param interpolation_type Interpolation scheme.
-         Can be <tt>{ 0=nearest-neighbor | 1=linear | 2=Runge-Kutta }</tt>.
-       \param is_fast_approx Tells if a fast approximation of the gaussian function is used or not.
-    **/
-    template<typename t>
-    CImg<T>& blur_anisotropic(const CImg<t>& G,
-                              const float amplitude=60, const float dl=0.8f, const float da=30,
-                              const float gauss_prec=2, const unsigned int interpolation_type=0,
-                              const bool is_fast_approx=1) {
-
-      // Check arguments and init variables
-      if (!is_sameXYZ(G) || (G._spectrum!=3 && G._spectrum!=6))
-        throw CImgArgumentException(_cimg_instance
-                                    "blur_anisotropic(): Invalid specified diffusion tensor field (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    G._width,G._height,G._depth,G._spectrum,G._data);
-
-      if (is_empty() || amplitude<=0 || dl<0) return *this;
-      const bool is_3d = (G._spectrum==6);
-      T val_min, val_max = max_min(val_min);
-      cimg_abort_init;
-
-      if (da<=0) {  // Iterated oriented Laplacians
-        CImg<Tfloat> velocity(_width,_height,_depth,_spectrum);
-        for (unsigned int iteration = 0; iteration<(unsigned int)amplitude; ++iteration) {
-          Tfloat *ptrd = velocity._data, veloc_max = 0;
-          if (is_3d) // 3d version
-            cimg_forC(*this,c) {
-              cimg_abort_test();
-              CImg_3x3x3(I,Tfloat);
-              cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-                const Tfloat
-                  ixx = Incc + Ipcc - 2*Iccc,
-                  ixy = (Innc + Ippc - Inpc - Ipnc)/4,
-                  ixz = (Incn + Ipcp - Incp - Ipcn)/4,
-                  iyy = Icnc + Icpc - 2*Iccc,
-                  iyz = (Icnn + Icpp - Icnp - Icpn)/4,
-                  izz = Iccn + Iccp - 2*Iccc,
-                  veloc = (Tfloat)(G(x,y,z,0)*ixx + 2*G(x,y,z,1)*ixy + 2*G(x,y,z,2)*ixz +
-                                   G(x,y,z,3)*iyy + 2*G(x,y,z,4)*iyz + G(x,y,z,5)*izz);
-                *(ptrd++) = veloc;
-                if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-              }
-            }
-          else // 2d version
-            cimg_forZC(*this,z,c) {
-              cimg_abort_test();
-              CImg_3x3(I,Tfloat);
-              cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-                const Tfloat
-                  ixx = Inc + Ipc - 2*Icc,
-                  ixy = (Inn + Ipp - Inp - Ipn)/4,
-                  iyy = Icn + Icp - 2*Icc,
-                  veloc = (Tfloat)(G(x,y,0,0)*ixx + 2*G(x,y,0,1)*ixy + G(x,y,0,2)*iyy);
-                *(ptrd++) = veloc;
-                if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-              }
-            }
-          if (veloc_max>0) *this+=(velocity*=dl/veloc_max);
-        }
-      } else { // LIC-based smoothing.
-        const ulongT whd = (ulongT)_width*_height*_depth;
-        const float sqrt2amplitude = (float)std::sqrt(2*amplitude);
-        const int dx1 = width() - 1, dy1 = height() - 1, dz1 = depth() - 1;
-        CImg<Tfloat> res(_width,_height,_depth,_spectrum,0), W(_width,_height,_depth,is_3d?4:3), val(_spectrum,1,1,1,0);
-        int N = 0;
-        if (is_3d) { // 3d version
-          for (float phi = (180%(int)da)/2.0f; phi<=180; phi+=da) {
-            const float phir = (float)(phi*cimg::PI/180), datmp = (float)(da/std::cos(phir)),
-              da2 = datmp<1?360.0f:datmp;
-            for (float theta = 0; theta<360; (theta+=da2),++N) {
-              const float
-                thetar = (float)(theta*cimg::PI/180),
-                vx = (float)(std::cos(thetar)*std::cos(phir)),
-                vy = (float)(std::sin(thetar)*std::cos(phir)),
-                vz = (float)std::sin(phir);
-              const t
-                *pa = G.data(0,0,0,0), *pb = G.data(0,0,0,1), *pc = G.data(0,0,0,2),
-                *pd = G.data(0,0,0,3), *pe = G.data(0,0,0,4), *pf = G.data(0,0,0,5);
-              Tfloat *pd0 = W.data(0,0,0,0), *pd1 = W.data(0,0,0,1), *pd2 = W.data(0,0,0,2), *pd3 = W.data(0,0,0,3);
-              cimg_forXYZ(G,xg,yg,zg) {
-                const t a = *(pa++), b = *(pb++), c = *(pc++), d = *(pd++), e = *(pe++), f = *(pf++);
-                const float
-                  u = (float)(a*vx + b*vy + c*vz),
-                  v = (float)(b*vx + d*vy + e*vz),
-                  w = (float)(c*vx + e*vy + f*vz),
-                  n = 1e-5f + cimg::hypot(u,v,w),
-                  dln = dl/n;
-                *(pd0++) = (Tfloat)(u*dln);
-                *(pd1++) = (Tfloat)(v*dln);
-                *(pd2++) = (Tfloat)(w*dln);
-                *(pd3++) = (Tfloat)n;
-              }
-
-              cimg_abort_test();
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=2)
-                                 firstprivate(val))
-              cimg_forYZ(*this,y,z) cimg_abort_try2 {
-                cimg_abort_test2();
-                cimg_forX(*this,x) {
-                  val.fill(0);
-                  const float
-                    n = (float)W(x,y,z,3),
-                    fsigma = (float)(n*sqrt2amplitude),
-                    fsigma2 = 2*fsigma*fsigma,
-                    length = gauss_prec*fsigma;
-                  float
-                    S = 0,
-                    X = (float)x,
-                    Y = (float)y,
-                    Z = (float)z;
-                  switch (interpolation_type) {
-                  case 0 : { // Nearest neighbor
-                    for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
-                      const int
-                        cx = (int)(X + 0.5f),
-                        cy = (int)(Y + 0.5f),
-                        cz = (int)(Z + 0.5f);
-                      const float
-                        u = (float)W(cx,cy,cz,0),
-                        v = (float)W(cx,cy,cz,1),
-                        w = (float)W(cx,cy,cz,2);
-                      if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)(*this)(cx,cy,cz,c); ++S; }
-                      else {
-                        const float coef = (float)std::exp(-l*l/fsigma2);
-                        cimg_forC(*this,c) val[c]+=(Tfloat)(coef*(*this)(cx,cy,cz,c));
-                        S+=coef;
-                      }
-                      X+=u; Y+=v; Z+=w;
-                    }
-                  } break;
-                  case 1 : { // Linear interpolation
-                    for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
-                      const float
-                        u = (float)(W._linear_atXYZ(X,Y,Z,0)),
-                        v = (float)(W._linear_atXYZ(X,Y,Z,1)),
-                        w = (float)(W._linear_atXYZ(X,Y,Z,2));
-                      if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXYZ(X,Y,Z,c); ++S; }
-                      else {
-                        const float coef = (float)std::exp(-l*l/fsigma2);
-                        cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXYZ(X,Y,Z,c));
-                        S+=coef;
-                      }
-                      X+=u; Y+=v; Z+=w;
-                    }
-                  } break;
-                  default : { // 2nd order Runge Kutta
-                    for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
-                      const float
-                        u0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,0)),
-                        v0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,1)),
-                        w0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,2)),
-                        u = (float)(W._linear_atXYZ(X + u0,Y + v0,Z + w0,0)),
-                        v = (float)(W._linear_atXYZ(X + u0,Y + v0,Z + w0,1)),
-                        w = (float)(W._linear_atXYZ(X + u0,Y + v0,Z + w0,2));
-                      if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXYZ(X,Y,Z,c); ++S; }
-                      else {
-                        const float coef = (float)std::exp(-l*l/fsigma2);
-                        cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXYZ(X,Y,Z,c));
-                        S+=coef;
-                      }
-                      X+=u; Y+=v; Z+=w;
-                    }
-                  } break;
-                  }
-                  Tfloat *ptrd = res.data(x,y,z);
-                  if (S>0) cimg_forC(res,c) { *ptrd+=val[c]/S; ptrd+=whd; }
-                  else cimg_forC(res,c) { *ptrd+=(Tfloat)((*this)(x,y,z,c)); ptrd+=whd; }
-                }
-              } cimg_abort_catch2()
-            }
-          }
-        } else { // 2d LIC algorithm
-          for (float theta = (360%(int)da)/2.0f; theta<360; (theta+=da),++N) {
-            const float thetar = (float)(theta*cimg::PI/180),
-              vx = (float)(std::cos(thetar)), vy = (float)(std::sin(thetar));
-            const t *pa = G.data(0,0,0,0), *pb = G.data(0,0,0,1), *pc = G.data(0,0,0,2);
-            Tfloat *pd0 = W.data(0,0,0,0), *pd1 = W.data(0,0,0,1), *pd2 = W.data(0,0,0,2);
-            cimg_forXY(G,xg,yg) {
-              const t a = *(pa++), b = *(pb++), c = *(pc++);
-              const float
-                u = (float)(a*vx + b*vy),
-                v = (float)(b*vx + c*vy),
-                n = std::max(1e-5f,cimg::hypot(u,v)),
-                dln = dl/n;
-              *(pd0++) = (Tfloat)(u*dln);
-              *(pd1++) = (Tfloat)(v*dln);
-              *(pd2++) = (Tfloat)n;
-            }
-
-            cimg_abort_test();
-            cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=256 && _height>=2) firstprivate(val))
-            cimg_forY(*this,y) cimg_abort_try2 {
-              cimg_abort_test2();
-              cimg_forX(*this,x) {
-                val.fill(0);
-                const float
-                  n = (float)W(x,y,0,2),
-                  fsigma = (float)(n*sqrt2amplitude),
-                  fsigma2 = 2*fsigma*fsigma,
-                  length = gauss_prec*fsigma;
-                float
-                  S = 0,
-                  X = (float)x,
-                  Y = (float)y;
-                switch (interpolation_type) {
-                case 0 : { // Nearest-neighbor
-                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
-                    const int
-                      cx = (int)(X + 0.5f),
-                      cy = (int)(Y + 0.5f);
-                    const float
-                      u = (float)W(cx,cy,0,0),
-                      v = (float)W(cx,cy,0,1);
-                    if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)(*this)(cx,cy,0,c); ++S; }
-                    else {
-                      const float coef = (float)std::exp(-l*l/fsigma2);
-                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*(*this)(cx,cy,0,c));
-                      S+=coef;
-                    }
-                    X+=u; Y+=v;
-                  }
-                } break;
-                case 1 : { // Linear interpolation
-                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
-                    const float
-                      u = (float)(W._linear_atXY(X,Y,0,0)),
-                      v = (float)(W._linear_atXY(X,Y,0,1));
-                    if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXY(X,Y,0,c); ++S; }
-                    else {
-                      const float coef = (float)std::exp(-l*l/fsigma2);
-                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXY(X,Y,0,c));
-                      S+=coef;
-                    }
-                    X+=u; Y+=v;
-                  }
-                } break;
-                default : { // 2nd-order Runge-kutta interpolation
-                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
-                    const float
-                      u0 = (float)(0.5f*W._linear_atXY(X,Y,0,0)),
-                      v0 = (float)(0.5f*W._linear_atXY(X,Y,0,1)),
-                      u = (float)(W._linear_atXY(X + u0,Y + v0,0,0)),
-                      v = (float)(W._linear_atXY(X + u0,Y + v0,0,1));
-                    if (is_fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXY(X,Y,0,c); ++S; }
-                    else {
-                      const float coef = (float)std::exp(-l*l/fsigma2);
-                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXY(X,Y,0,c));
-                      S+=coef;
-                    }
-                    X+=u; Y+=v;
-                  }
-                }
-                }
-                Tfloat *ptrd = res.data(x,y);
-                if (S>0) cimg_forC(res,c) { *ptrd+=val[c]/S; ptrd+=whd; }
-                else cimg_forC(res,c) { *ptrd+=(Tfloat)((*this)(x,y,0,c)); ptrd+=whd; }
-              }
-            } cimg_abort_catch2()
-          }
-        }
-        const Tfloat *ptrs = res._data;
-        cimg_for(*this,ptrd,T) {
-          const Tfloat val = *(ptrs++)/N;
-          *ptrd = val<val_min?val_min:(val>val_max?val_max:(T)val);
-        }
-      }
-      cimg_abort_test();
-      return *this;
-    }
-
-    //! Blur image anisotropically, directed by a field of diffusion tensors \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_blur_anisotropic(const CImg<t>& G,
-                                      const float amplitude=60, const float dl=0.8f, const float da=30,
-                                      const float gauss_prec=2, const unsigned int interpolation_type=0,
-                                      const bool is_fast_approx=true) const {
-      return CImg<Tfloat>(*this,false).blur_anisotropic(G,amplitude,dl,da,gauss_prec,interpolation_type,is_fast_approx);
-    }
-
-    //! Blur image anisotropically, in an edge-preserving way.
-    /**
-       \param amplitude Amplitude of the smoothing.
-       \param sharpness Sharpness.
-       \param anisotropy Anisotropy.
-       \param alpha Standard deviation of the gradient blur.
-       \param sigma Standard deviation of the structure tensor blur.
-       \param dl Spatial discretization.
-       \param da Angular discretization.
-       \param gauss_prec Precision of the diffusion process.
-       \param interpolation_type Interpolation scheme.
-         Can be <tt>{ 0=nearest-neighbor | 1=linear | 2=Runge-Kutta }</tt>.
-       \param is_fast_approx Tells if a fast approximation of the gaussian function is used or not.
-     **/
-    CImg<T>& blur_anisotropic(const float amplitude, const float sharpness=0.7f, const float anisotropy=0.6f,
-                              const float alpha=0.6f, const float sigma=1.1f, const float dl=0.8f, const float da=30,
-                              const float gauss_prec=2, const unsigned int interpolation_type=0,
-                              const bool is_fast_approx=true) {
-      return blur_anisotropic(get_diffusion_tensors(sharpness,anisotropy,alpha,sigma,interpolation_type!=3),
-                              amplitude,dl,da,gauss_prec,interpolation_type,is_fast_approx);
-    }
-
-    //! Blur image anisotropically, in an edge-preserving way \newinstance.
-    CImg<Tfloat> get_blur_anisotropic(const float amplitude, const float sharpness=0.7f, const float anisotropy=0.6f,
-                                      const float alpha=0.6f, const float sigma=1.1f, const float dl=0.8f,
-                                      const float da=30, const float gauss_prec=2,
-                                      const unsigned int interpolation_type=0,
-                                      const bool is_fast_approx=true) const {
-      return CImg<Tfloat>(*this,false).blur_anisotropic(amplitude,sharpness,anisotropy,alpha,sigma,dl,da,gauss_prec,
-                                                        interpolation_type,is_fast_approx);
-    }
-
-    //! Blur image, with the joint bilateral filter.
-    /**
-       \param guide Image used to model the smoothing weights.
-       \param sigma_x Amount of blur along the X-axis.
-       \param sigma_y Amount of blur along the Y-axis.
-       \param sigma_z Amount of blur along the Z-axis.
-       \param sigma_r Amount of blur along the value axis.
-       \param sampling_x Amount of downsampling along the X-axis used for the approximation.
-         Defaults (0) to sigma_x.
-       \param sampling_y Amount of downsampling along the Y-axis used for the approximation.
-         Defaults (0) to sigma_y.
-       \param sampling_z Amount of downsampling along the Z-axis used for the approximation.
-         Defaults (0) to sigma_z.
-       \param sampling_r Amount of downsampling along the value axis used for the approximation.
-         Defaults (0) to sigma_r.
-       \note This algorithm uses the optimisation technique proposed by S. Paris and F. Durand, in ECCV'2006
-       (extended for 3d volumetric images).
-       It is based on the reference implementation http://people.csail.mit.edu/jiawen/software/bilateralFilter.m
-    **/
-    template<typename t>
-    CImg<T>& blur_bilateral(const CImg<t>& guide,
-                            const float sigma_x, const float sigma_y,
-                            const float sigma_z, const float sigma_r,
-                            const float sampling_x, const float sampling_y,
-                            const float sampling_z, const float sampling_r) {
-      if (!is_sameXYZ(guide))
-        throw CImgArgumentException(_cimg_instance
-                                    "blur_bilateral(): Invalid size for specified guide image (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    guide._width,guide._height,guide._depth,guide._spectrum,guide._data);
-      if (is_empty() || (!sigma_x && !sigma_y && !sigma_z)) return *this;
-      T edge_min, edge_max = guide.max_min(edge_min);
-      if (edge_min==edge_max) return blur(sigma_x,sigma_y,sigma_z);
-      const float
-        edge_delta = (float)(edge_max - edge_min),
-        _sigma_x = sigma_x>=0?sigma_x:-sigma_x*_width/100,
-        _sigma_y = sigma_y>=0?sigma_y:-sigma_y*_height/100,
-        _sigma_z = sigma_z>=0?sigma_z:-sigma_z*_depth/100,
-        _sigma_r = sigma_r>=0?sigma_r:-sigma_r*(edge_max - edge_min)/100,
-        _sampling_x = sampling_x?sampling_x:std::max(_sigma_x,1.0f),
-        _sampling_y = sampling_y?sampling_y:std::max(_sigma_y,1.0f),
-        _sampling_z = sampling_z?sampling_z:std::max(_sigma_z,1.0f),
-        _sampling_r = sampling_r?sampling_r:std::max(_sigma_r,edge_delta/256),
-        derived_sigma_x = _sigma_x / _sampling_x,
-        derived_sigma_y = _sigma_y / _sampling_y,
-        derived_sigma_z = _sigma_z / _sampling_z,
-        derived_sigma_r = _sigma_r / _sampling_r;
-      const int
-        padding_x = (int)(2*derived_sigma_x) + 1,
-        padding_y = (int)(2*derived_sigma_y) + 1,
-        padding_z = (int)(2*derived_sigma_z) + 1,
-        padding_r = (int)(2*derived_sigma_r) + 1;
-      const unsigned int
-        bx = (unsigned int)((_width  - 1)/_sampling_x + 1 + 2*padding_x),
-        by = (unsigned int)((_height - 1)/_sampling_y + 1 + 2*padding_y),
-        bz = (unsigned int)((_depth  - 1)/_sampling_z + 1 + 2*padding_z),
-        br = (unsigned int)(edge_delta/_sampling_r + 1 + 2*padding_r);
-      if (bx>0 || by>0 || bz>0 || br>0) {
-        const bool is_3d = (_depth>1);
-        if (is_3d) { // 3d version of the algorithm
-          CImg<floatT> bgrid(bx,by,bz,br), bgridw(bx,by,bz,br);
-          cimg_forC(*this,c) {
-            const CImg<t> _guide = guide.get_shared_channel(c%guide._spectrum);
-            bgrid.fill(0); bgridw.fill(0);
-            cimg_forXYZ(*this,x,y,z) {
-              const T val = (*this)(x,y,z,c);
-              const float edge = (float)_guide(x,y,z);
-              const int
-                X = (int)cimg::round(x/_sampling_x) + padding_x,
-                Y = (int)cimg::round(y/_sampling_y) + padding_y,
-                Z = (int)cimg::round(z/_sampling_z) + padding_z,
-                R = (int)cimg::round((edge - edge_min)/_sampling_r) + padding_r;
-              bgrid(X,Y,Z,R)+=(float)val;
-              bgridw(X,Y,Z,R)+=1;
-            }
-            bgrid.blur(derived_sigma_x,derived_sigma_y,derived_sigma_z,true).deriche(derived_sigma_r,0,'c',false);
-            bgridw.blur(derived_sigma_x,derived_sigma_y,derived_sigma_z,true).deriche(derived_sigma_r,0,'c',false);
-
-            cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(size()>=4096))
-            cimg_forXYZ(*this,x,y,z) {
-              const float edge = (float)_guide(x,y,z);
-              const float
-                X = x/_sampling_x + padding_x,
-                Y = y/_sampling_y + padding_y,
-                Z = z/_sampling_z + padding_z,
-                R = (edge - edge_min)/_sampling_r + padding_r;
-              const float bval0 = bgrid._linear_atXYZC(X,Y,Z,R), bval1 = bgridw._linear_atXYZC(X,Y,Z,R);
-              (*this)(x,y,z,c) = (T)(bval0/bval1);
-            }
-          }
-        } else { // 2d version of the algorithm
-          CImg<floatT> bgrid(bx,by,br,2);
-          cimg_forC(*this,c) {
-            const CImg<t> _guide = guide.get_shared_channel(c%guide._spectrum);
-            bgrid.fill(0);
-            cimg_forXY(*this,x,y) {
-              const T val = (*this)(x,y,c);
-              const float edge = (float)_guide(x,y);
-              const int
-                X = (int)cimg::round(x/_sampling_x) + padding_x,
-                Y = (int)cimg::round(y/_sampling_y) + padding_y,
-                R = (int)cimg::round((edge - edge_min)/_sampling_r) + padding_r;
-              bgrid(X,Y,R,0)+=(float)val;
-              bgrid(X,Y,R,1)+=1;
-            }
-            bgrid.blur(derived_sigma_x,derived_sigma_y,0,true).blur(0,0,derived_sigma_r,false);
-
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(size()>=4096))
-            cimg_forXY(*this,x,y) {
-              const float edge = (float)_guide(x,y);
-              const float
-                X = x/_sampling_x + padding_x,
-                Y = y/_sampling_y + padding_y,
-                R = (edge - edge_min)/_sampling_r + padding_r;
-              const float bval0 = bgrid._linear_atXYZ(X,Y,R,0), bval1 = bgrid._linear_atXYZ(X,Y,R,1);
-              (*this)(x,y,c) = (T)(bval0/bval1);
-            }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Blur image, with the joint bilateral filter \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_blur_bilateral(const CImg<t>& guide,
-                                    const float sigma_x, const float sigma_y,
-                                    const float sigma_z, const float sigma_r,
-                                    const float sampling_x, const float sampling_y,
-                                    const float sampling_z, const float sampling_r) const {
-      return CImg<Tfloat>(*this,false).blur_bilateral(guide,sigma_x,sigma_y,sigma_z,sigma_r,
-                                                      sampling_x,sampling_y,sampling_z,sampling_r);
-    }
-
-    //! Blur image using the joint bilateral filter.
-    /**
-       \param guide Image used to model the smoothing weights.
-       \param sigma_s Amount of blur along the XYZ-axes.
-       \param sigma_r Amount of blur along the value axis.
-       \param sampling_s Amount of downsampling along the XYZ-axes used for the approximation. Defaults to sigma_s.
-       \param sampling_r Amount of downsampling along the value axis used for the approximation. Defaults to sigma_r.
-    **/
-    template<typename t>
-    CImg<T>& blur_bilateral(const CImg<t>& guide,
-                            const float sigma_s, const float sigma_r,
-                            const float sampling_s=0, const float sampling_r=0) {
-      const float _sigma_s = sigma_s>=0?sigma_s:-sigma_s*cimg::max(_width,_height,_depth)/100;
-      return blur_bilateral(guide,_sigma_s,_sigma_s,_sigma_s,sigma_r,sampling_s,sampling_s,sampling_s,sampling_r);
-    }
-
-    //! Blur image using the bilateral filter \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_blur_bilateral(const CImg<t>& guide,
-                                    const float sigma_s, const float sigma_r,
-                                    const float sampling_s=0, const float sampling_r=0) const {
-      return CImg<Tfloat>(*this,false).blur_bilateral(guide,sigma_s,sigma_r,sampling_s,sampling_r);
-    }
-
-    // [internal] Apply a box filter (used by CImg<T>::boxfilter() and CImg<T>::blur_box()).
-    /*
-      \param ptr the pointer of the data
-      \param N size of the data
-      \param boxsize Size of the box filter (can be subpixel).
-      \param off the offset between two data point
-      \param order the order of the filter 0 (smoothing), 1st derivtive and 2nd derivative.
-      \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.
-    */
-    static void _cimg_blur_box_apply(T *ptr, const float boxsize, const int N, const ulongT off,
-                                     const int order, const bool boundary_conditions,
-                                     const unsigned int nb_iter) {
-      // Smooth.
-      if (boxsize>1 && nb_iter) {
-        const int w2 = (int)(boxsize - 1)/2;
-        const unsigned int winsize = 2*w2 + 1U;
-        const double frac = (boxsize - winsize)/2.;
-        CImg<T> win(winsize);
-        for (unsigned int iter = 0; iter<nb_iter; ++iter) {
-          Tdouble sum = 0; // window sum
-          for (int x = -w2; x<=w2; ++x) {
-            win[x + w2] = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,x);
-            sum+=win[x + w2];
-          }
-          int ifirst = 0, ilast = 2*w2;
-          T
-            prev = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,-w2 - 1),
-            next = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,w2 + 1);
-          for (int x = 0; x < N - 1; ++x) {
-            const double sum2 = sum + frac * (prev + next);
-            ptr[x*off] = (T)(sum2/boxsize);
-            prev = win[ifirst];
-            sum-=prev;
-            ifirst = (int)((ifirst + 1)%winsize);
-            ilast = (int)((ilast + 1)%winsize);
-            win[ilast] = next;
-            sum+=next;
-            next = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,x + w2 + 2);
-          }
-          const double sum2 = sum + frac * (prev + next);
-          ptr[(N - 1)*off] = (T)(sum2/boxsize);
-        }
-      }
-
-      // Derive.
-      switch (order) {
-      case 0 :
-        break;
-      case 1 : {
-        Tfloat
-          p = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,-1),
-          c = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,0),
-          n = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,1);
-        for (int x = 0; x<N - 1; ++x) {
-          ptr[x*off] = (T)((n-p)/2.0);
-          p = c;
-          c = n;
-          n = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,x + 2);
-        }
-        ptr[(N - 1)*off] = (T)((n-p)/2.0);
-      } break;
-      case 2: {
-        Tfloat
-          p = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,-1),
-          c = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,0),
-          n = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,1);
-        for (int x = 0; x<N - 1; ++x) {
-          ptr[x*off] = (T)(n - 2*c + p);
-          p = c;
-          c = n;
-          n = __cimg_blur_box_apply(ptr,N,off,boundary_conditions,x + 2);
-        }
-        ptr[(N - 1)*off] = (T)(n - 2*c + p);
-      } break;
-      }
-    }
-
-    static T __cimg_blur_box_apply(T *ptr, const int N, const ulongT off,
-                                   const bool boundary_conditions, const int x) {
-      if (x<0) return boundary_conditions?ptr[0]:T();
-      if (x>=N) return boundary_conditions?ptr[(N - 1)*off]:T();
-      return ptr[x*off];
-    }
-
-    // Apply box filter of order 0,1,2.
-    /**
-      \param boxsize Size of the box window (can be subpixel)
-      \param order the order of the filter 0,1 or 2.
-      \param axis  Axis along which the filter is computed. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.
-    **/
-    CImg<T>& boxfilter(const float boxsize, const int order, const char axis='x',
-                       const bool boundary_conditions=true,
-                       const unsigned int nb_iter=1) {
-      if (is_empty() || !boxsize || (boxsize<=1 && !order)) return *this;
-      const char naxis = cimg::lowercase(axis);
-      const float nboxsize = boxsize>=0?boxsize:-boxsize*
-        (naxis=='x'?_width:naxis=='y'?_height:naxis=='z'?_depth:_spectrum)/100;
-      switch (naxis) {
-      case 'x' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forYZC(*this,y,z,c)
-          _cimg_blur_box_apply(data(0,y,z,c),nboxsize,_width,1U,order,boundary_conditions,nb_iter);
-      } break;
-      case 'y' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXZC(*this,x,z,c)
-          _cimg_blur_box_apply(data(x,0,z,c),nboxsize,_height,(ulongT)_width,order,boundary_conditions,nb_iter);
-      } break;
-      case 'z' : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYC(*this,x,y,c)
-          _cimg_blur_box_apply(data(x,y,0,c),nboxsize,_depth,(ulongT)_width*_height,order,boundary_conditions,nb_iter);
-      } break;
-      default : {
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=256 && _height*_depth*_spectrum>=16))
-        cimg_forXYZ(*this,x,y,z)
-          _cimg_blur_box_apply(data(x,y,z,0),nboxsize,_spectrum,(ulongT)_width*_height*_depth,
-                               order,boundary_conditions,nb_iter);
-      }
-      }
-      return *this;
-    }
-
-    // Apply box filter of order 0,1 or 2 \newinstance.
-    CImg<Tfloat> get_boxfilter(const float boxsize, const int order, const char axis='x',
-                               const bool boundary_conditions=true,
-                               const unsigned int nb_iter=1) const {
-      return CImg<Tfloat>(*this,false).boxfilter(boxsize,order,axis,boundary_conditions,nb_iter);
-    }
-
-    //! Blur image with a box filter.
-    /**
-       \param boxsize_x Size of the box window, along the X-axis (can be subpixel).
-       \param boxsize_y Size of the box window, along the Y-axis (can be subpixel).
-       \param boxsize_z Size of the box window, along the Z-axis (can be subpixel).
-       \param boundary_conditions Boundary conditions. Can be <tt>{ false=dirichlet | true=neumann }</tt>.
-       \note
-       - This is a recursive algorithm, not depending on the values of the box kernel size.
-       \see blur().
-    **/
-    CImg<T>& blur_box(const float boxsize_x, const float boxsize_y, const float boxsize_z,
-                      const bool boundary_conditions=true,
-                      const unsigned int nb_iter=1) {
-      if (is_empty()) return *this;
-      if (_width>1) boxfilter(boxsize_x,0,'x',boundary_conditions,nb_iter);
-      if (_height>1) boxfilter(boxsize_y,0,'y',boundary_conditions,nb_iter);
-      if (_depth>1) boxfilter(boxsize_z,0,'z',boundary_conditions,nb_iter);
-      return *this;
-    }
-
-    //! Blur image with a box filter \newinstance.
-    CImg<Tfloat> get_blur_box(const float boxsize_x, const float boxsize_y, const float boxsize_z,
-                              const bool boundary_conditions=true) const {
-      return CImg<Tfloat>(*this,false).blur_box(boxsize_x,boxsize_y,boxsize_z,boundary_conditions);
-    }
-
-    //! Blur image with a box filter.
-    /**
-       \param boxsize Size of the box window (can be subpixel).
-       \param boundary_conditions Boundary conditions. Can be <tt>{ 0=dirichlet | 1=neumann }</tt>.a
-       \see deriche(), vanvliet().
-    **/
-    CImg<T>& blur_box(const float boxsize, const bool boundary_conditions=true) {
-      const float nboxsize = boxsize>=0?boxsize:-boxsize*cimg::max(_width,_height,_depth)/100;
-      return blur_box(nboxsize,nboxsize,nboxsize,boundary_conditions);
-    }
-
-    //! Blur image with a box filter \newinstance.
-    CImg<Tfloat> get_blur_box(const float boxsize, const bool boundary_conditions=true) const {
-      return CImg<Tfloat>(*this,false).blur_box(boxsize,boundary_conditions);
-    }
-
-    //! Blur image, with the image guided filter.
-    /**
-       \param guide Image used to guide the smoothing process.
-       \param radius Spatial radius. If negative, it is expressed as a percentage of the largest image size.
-       \param regularization Regularization parameter.
-                             If negative, it is expressed as a percentage of the guide value range.
-       \note This method implements the filtering algorithm described in:
-       He, Kaiming; Sun, Jian; Tang, Xiaoou, "Guided Image Filtering," Pattern Analysis and Machine Intelligence,
-       IEEE Transactions on , vol.35, no.6, pp.1397,1409, June 2013
-    **/
-    template<typename t>
-    CImg<T>& blur_guided(const CImg<t>& guide, const float radius, const float regularization) {
-      return get_blur_guided(guide,radius,regularization).move_to(*this);
-    }
-
-    //! Blur image, with the image guided filter \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_blur_guided(const CImg<t>& guide, const float radius, const float regularization) const {
-      if (!is_sameXYZ(guide))
-        throw CImgArgumentException(_cimg_instance
-                                    "blur_guided(): Invalid size for specified guide image (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    guide._width,guide._height,guide._depth,guide._spectrum,guide._data);
-      if (is_empty() || !radius) return *this;
-      const int _radius = radius>=0?(int)radius:(int)(-radius*cimg::max(_width,_height,_depth)/100);
-      float _regularization = regularization;
-      if (regularization<0) {
-        T edge_min, edge_max = guide.max_min(edge_min);
-        if (edge_min==edge_max) return *this;
-        _regularization = -regularization*(edge_max - edge_min)/100;
-      }
-      _regularization = std::max(_regularization,0.01f);
-      const unsigned int psize = (unsigned int)(1 + 2*_radius);
-      const CImg<uintT> N = CImg<uintT>(_width,_height,_depth,1,1)._blur_guided(psize);
-      CImg<Tfloat>
-        mean_I = CImg<Tfloat>(guide,false)._blur_guided(psize).div(N),
-        mean_p = CImg<Tfloat>(*this,false)._blur_guided(psize).div(N),
-        cov_Ip = CImg<Tfloat>(*this,false).mul(guide)._blur_guided(psize).div(N)-=mean_p.get_mul(mean_I),
-        var_I = CImg<Tfloat>(guide,false).sqr()._blur_guided(psize).div(N)-=mean_I.get_sqr(),
-        &a = cov_Ip.div(var_I+=_regularization),
-        &b = mean_p-=a.get_mul(mean_I);
-      a._blur_guided(psize).div(N);
-      b._blur_guided(psize).div(N);
-      return a.mul(guide)+=b;
-    }
-
-    // [internal] Perform box filter with dirichlet boundary conditions.
-    CImg<T>& _blur_guided(const unsigned int psize) {
-      const int p1 = (int)psize/2, p2 = (int)psize - p1;
-      if (_depth!=1) {
-        CImg<floatT> cumul = get_cumulate('z'), cumul2 = cumul.get_shift(0,0,p2,0,1);
-        (cumul.shift(0,0,-p1,0,1)-=cumul2).move_to(*this);
-      }
-      if (_height!=1) {
-        CImg<floatT> cumul = get_cumulate('y'), cumul2 = cumul.get_shift(0,p2,0,0,1);
-        (cumul.shift(0,-p1,0,0,1)-=cumul2).move_to(*this);
-      }
-      if (_width!=1) {
-        CImg<floatT> cumul = get_cumulate('x'), cumul2 = cumul.get_shift(p2,0,0,0,1);
-        (cumul.shift(-p1,0,0,0,1)-=cumul2).move_to(*this);
-      }
-      return *this;
-    }
-
-    //! Blur image using patch-based space.
-    /**
-       \param sigma_s Amount of blur along the XYZ-axes.
-       \param sigma_p Amount of blur along the value axis.
-       \param patch_size Size of the patchs.
-       \param lookup_size Size of the window to search similar patchs.
-       \param smoothness Smoothness for the patch comparison.
-       \param is_fast_approx Tells if a fast approximation of the gaussian function is used or not.
-    **/
-    CImg<T>& blur_patch(const float sigma_s, const float sigma_p, const unsigned int patch_size=3,
-                        const unsigned int lookup_size=4, const float smoothness=0, const bool is_fast_approx=true) {
-      if (is_empty() || !patch_size || !lookup_size) return *this;
-      return get_blur_patch(sigma_s,sigma_p,patch_size,lookup_size,smoothness,is_fast_approx).move_to(*this);
-    }
-
-    //! Blur image using patch-based space \newinstance.
-    CImg<Tfloat> get_blur_patch(const float sigma_s, const float sigma_p, const unsigned int patch_size=3,
-                                const unsigned int lookup_size=4, const float smoothness=0,
-                                const bool is_fast_approx=true) const {
-
-#define _cimg_blur_patch3d_fast(N) \
-      cimg_for##N##XYZ(res,x,y,z) { \
-        T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,x,y,z,c,pP,T); pP+=N3; } \
-        const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, \
-          x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2; \
-        float sum_weights = 0; \
-        cimg_for_in##N##XYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (cimg::abs(img(x,y,z,0) - img(p,q,r,0))<sigma_p3) { \
-          T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,p,q,r,c,pQ,T); pQ+=N3; } \
-          float distance2 = 0; \
-          pQ = Q._data; cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(pQ++); distance2+=dI*dI; } \
-          distance2/=Pnorm; \
-          const float dx = (float)p - x, dy = (float)q - y, dz = (float)r - z, \
-            alldist = distance2 + (dx*dx + dy*dy + dz*dz)/sigma_s2, weight = alldist>3?0.0f:1.0f; \
-          sum_weights+=weight; \
-          cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c); \
-        } \
-        if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights; \
-        else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c)); \
-    }
-
-#define _cimg_blur_patch3d(N) \
-      cimg_for##N##XYZ(res,x,y,z) { \
-        T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,x,y,z,c,pP,T); pP+=N3; } \
-        const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, \
-          x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2; \
-        float sum_weights = 0, weight_max = 0; \
-        cimg_for_in##N##XYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (p!=x || q!=y || r!=z) { \
-          T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,p,q,r,c,pQ,T); pQ+=N3; } \
-          float distance2 = 0; \
-          pQ = Q._data; cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(pQ++); distance2+=dI*dI; } \
-          distance2/=Pnorm; \
-          const float dx = (float)p - x, dy = (float)q - y, dz = (float)r - z, \
-            alldist = distance2 + (dx*dx + dy*dy + dz*dz)/sigma_s2, weight = (float)std::exp(-alldist); \
-          if (weight>weight_max) weight_max = weight; \
-          sum_weights+=weight; \
-          cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c); \
-        } \
-        sum_weights+=weight_max; cimg_forC(res,c) res(x,y,z,c)+=weight_max*(*this)(x,y,z,c); \
-        if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights; \
-        else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c)); \
-      }
-
-#define _cimg_blur_patch2d_fast(N) \
-        cimg_for##N##XY(res,x,y) { \
-          T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N(img,x,y,0,c,pP,T); pP+=N2; } \
-          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2; \
-          float sum_weights = 0; \
-          cimg_for_in##N##XY(res,x0,y0,x1,y1,p,q) if (cimg::abs(img(x,y,0,0) - img(p,q,0,0))<sigma_p3) { \
-            T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N(img,p,q,0,c,pQ,T); pQ+=N2; } \
-            float distance2 = 0; \
-            pQ = Q._data; cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(pQ++); distance2+=dI*dI; } \
-            distance2/=Pnorm; \
-            const float dx = (float)p - x, dy = (float)q - y, \
-              alldist = distance2 + (dx*dx+dy*dy)/sigma_s2, weight = alldist>3?0.0f:1.0f; \
-            sum_weights+=weight; \
-            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c); \
-          } \
-          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights; \
-          else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c)); \
-        }
-
-#define _cimg_blur_patch2d(N) \
-        cimg_for##N##XY(res,x,y) { \
-          T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N(img,x,y,0,c,pP,T); pP+=N2; } \
-          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2; \
-          float sum_weights = 0, weight_max = 0; \
-          cimg_for_in##N##XY(res,x0,y0,x1,y1,p,q) if (p!=x || q!=y) { \
-            T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N(img,p,q,0,c,pQ,T); pQ+=N2; } \
-            float distance2 = 0; \
-            pQ = Q._data; cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(pQ++); distance2+=dI*dI; } \
-            distance2/=Pnorm; \
-            const float dx = (float)p - x, dy = (float)q - y, \
-              alldist = distance2 + (dx*dx+dy*dy)/sigma_s2, weight = (float)std::exp(-alldist); \
-            if (weight>weight_max) weight_max = weight; \
-            sum_weights+=weight; \
-            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c); \
-          } \
-          sum_weights+=weight_max; cimg_forC(res,c) res(x,y,c)+=weight_max*(*this)(x,y,c); \
-          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights; \
-          else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c)); \
-    }
-
-      if (is_empty() || !patch_size || !lookup_size) return +*this;
-      CImg<Tfloat> res(_width,_height,_depth,_spectrum,0);
-      const CImg<T> _img = smoothness>0?get_blur(smoothness):CImg<Tfloat>(),&img = smoothness>0?_img:*this;
-      CImg<T> P(patch_size*patch_size*_spectrum), Q(P);
-      const float
-        nsigma_s = sigma_s>=0?sigma_s:-sigma_s*cimg::max(_width,_height,_depth)/100,
-        sigma_s2 = nsigma_s*nsigma_s, sigma_p2 = sigma_p*sigma_p, sigma_p3 = 3*sigma_p,
-        Pnorm = P.size()*sigma_p2;
-      const int rsize2 = (int)lookup_size/2, rsize1 = (int)lookup_size - rsize2 - 1;
-      const unsigned int N2 = patch_size*patch_size, N3 = N2*patch_size;
-      cimg::unused(N2,N3);
-      if (_depth>1) switch (patch_size) { // 3d
-        case 2 : if (is_fast_approx) _cimg_blur_patch3d_fast(2) else _cimg_blur_patch3d(2) break;
-        case 3 : if (is_fast_approx) _cimg_blur_patch3d_fast(3) else _cimg_blur_patch3d(3) break;
-        default : {
-          const int psize2 = (int)patch_size/2, psize1 = (int)patch_size - psize2 - 1;
-          if (is_fast_approx)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(res._width>=32 && res._height*res._depth>=4)
-                               private(P,Q))
-            cimg_forXYZ(res,x,y,z) { // Fast
-              P = img.get_crop(x - psize1,y - psize1,z - psize1,x + psize2,y + psize2,z + psize2,true);
-              const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1,
-                x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2;
-              float sum_weights = 0;
-              cimg_for_inXYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (cimg::abs(img(x,y,z,0)-img(p,q,r,0))<sigma_p3) {
-                (Q = img.get_crop(p - psize1,q - psize1,r - psize1,p + psize2,q + psize2,r + psize2,true))-=P;
-                const float
-                  dx = (float)x - p, dy = (float)y - q, dz = (float)z - r,
-                  distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy + dz*dz)/sigma_s2),
-                  weight = distance2>3?0.0f:1.0f;
-                sum_weights+=weight;
-                cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c);
-              }
-              if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights;
-              else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c));
-            } else
-            cimg_pragma_openmp(parallel for collapse(2)
-                               if (res._width>=32 && res._height*res._depth>=4) firstprivate(P,Q))
-            cimg_forXYZ(res,x,y,z) { // Exact
-              P = img.get_crop(x - psize1,y - psize1,z - psize1,x + psize2,y + psize2,z + psize2,true);
-              const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1,
-                x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2;
-              float sum_weights = 0, weight_max = 0;
-              cimg_for_inXYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (p!=x || q!=y || r!=z) {
-                (Q = img.get_crop(p - psize1,q - psize1,r - psize1,p + psize2,q + psize2,r + psize2,true))-=P;
-                const float
-                  dx = (float)x - p, dy = (float)y - q, dz = (float)z - r,
-                  distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy + dz*dz)/sigma_s2),
-                  weight = (float)std::exp(-distance2);
-                if (weight>weight_max) weight_max = weight;
-                sum_weights+=weight;
-                cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c);
-              }
-              sum_weights+=weight_max; cimg_forC(res,c) res(x,y,z,c)+=weight_max*(*this)(x,y,z,c);
-              if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights;
-              else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c));
-            }
-        }
-        } else switch (patch_size) { // 2d
-        case 2 : if (is_fast_approx) _cimg_blur_patch2d_fast(2) else _cimg_blur_patch2d(2) break;
-        case 3 : if (is_fast_approx) _cimg_blur_patch2d_fast(3) else _cimg_blur_patch2d(3) break;
-        case 4 : if (is_fast_approx) _cimg_blur_patch2d_fast(4) else _cimg_blur_patch2d(4) break;
-        case 5 : if (is_fast_approx) _cimg_blur_patch2d_fast(5) else _cimg_blur_patch2d(5) break;
-        case 6 : if (is_fast_approx) _cimg_blur_patch2d_fast(6) else _cimg_blur_patch2d(6) break;
-        case 7 : if (is_fast_approx) _cimg_blur_patch2d_fast(7) else _cimg_blur_patch2d(7) break;
-        case 8 : if (is_fast_approx) _cimg_blur_patch2d_fast(8) else _cimg_blur_patch2d(8) break;
-        case 9 : if (is_fast_approx) _cimg_blur_patch2d_fast(9) else _cimg_blur_patch2d(9) break;
-        default : { // Fast
-          const int psize2 = (int)patch_size/2, psize1 = (int)patch_size - psize2 - 1;
-          if (is_fast_approx)
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=32 && res._height>=4) firstprivate(P,Q))
-            cimg_forXY(res,x,y) { // 2d fast approximation.
-              P = img.get_crop(x - psize1,y - psize1,x + psize2,y + psize2,true);
-              const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2;
-              float sum_weights = 0;
-              cimg_for_inXY(res,x0,y0,x1,y1,p,q) if (cimg::abs(img(x,y,0)-img(p,q,0))<sigma_p3) {
-                (Q = img.get_crop(p - psize1,q - psize1,p + psize2,q + psize2,true))-=P;
-                const float
-                  dx = (float)x - p, dy = (float)y - q,
-                  distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy)/sigma_s2),
-                  weight = distance2>3?0.0f:1.0f;
-                sum_weights+=weight;
-                cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c);
-              }
-              if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights;
-              else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c));
-            } else
-            cimg_pragma_openmp(parallel for cimg_openmp_if(res._width>=32 && res._height>=4) firstprivate(P,Q))
-            cimg_forXY(res,x,y) { // 2d exact algorithm.
-              P = img.get_crop(x - psize1,y - psize1,x + psize2,y + psize2,true);
-              const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2;
-              float sum_weights = 0, weight_max = 0;
-              cimg_for_inXY(res,x0,y0,x1,y1,p,q) if (p!=x || q!=y) {
-                (Q = img.get_crop(p - psize1,q - psize1,p + psize2,q + psize2,true))-=P;
-                const float
-                  dx = (float)x - p, dy = (float)y - q,
-                  distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy)/sigma_s2),
-                  weight = (float)std::exp(-distance2);
-                if (weight>weight_max) weight_max = weight;
-                sum_weights+=weight;
-                cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c);
-              }
-              sum_weights+=weight_max; cimg_forC(res,c) res(x,y,c)+=weight_max*(*this)(x,y,c);
-              if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights;
-              else cimg_forC(res,c) res(x,y,0,c) = (Tfloat)((*this)(x,y,c));
-            }
-        }
-        }
-      return res;
-    }
-
-    //! Blur image with the median filter.
-    /**
-       \param n Size of the median filter.
-       \param threshold Threshold used to discard pixels too far from the current pixel value in the median computation.
-    **/
-    CImg<T>& blur_median(const unsigned int n, const float threshold=0) {
-      if (!n) return *this;
-      return get_blur_median(n,threshold).move_to(*this);
-    }
-
-    //! Blur image with the median filter \newinstance.
-    CImg<T> get_blur_median(const unsigned int n, const float threshold=0) const {
-      if (is_empty() || n<=1) return +*this;
-      CImg<T> res(_width,_height,_depth,_spectrum);
-      T *ptrd = res._data;
-      cimg::unused(ptrd);
-      const int hr = (int)n/2, hl = n - hr - 1;
-      if (res._depth!=1) { // 3d
-        if (threshold>0)
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=16 && _height*_depth*_spectrum>=4))
-          cimg_forXYZC(*this,x,y,z,c) { // With threshold.
-            const int
-              x0 = x - hl, y0 = y - hl, z0 = z - hl, x1 = x + hr, y1 = y + hr, z1 = z + hr,
-              nx0 = x0<0?0:x0, ny0 = y0<0?0:y0, nz0 = z0<0?0:z0,
-              nx1 = x1>=width()?width() - 1:x1, ny1 = y1>=height()?height() - 1:y1, nz1 = z1>=depth()?depth() - 1:z1;
-            const float val0 = (float)(*this)(x,y,z,c);
-            CImg<T> values(n*n*n);
-            unsigned int nb_values = 0;
-            T *ptrd = values.data();
-            cimg_for_inXYZ(*this,nx0,ny0,nz0,nx1,ny1,nz1,p,q,r)
-              if (cimg::abs((float)(*this)(p,q,r,c)-val0)<=threshold) { *(ptrd++) = (*this)(p,q,r,c); ++nb_values; }
-            res(x,y,z,c) = values.get_shared_points(0,nb_values - 1).median();
-          }
-        else
-          cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width>=16 && _height*_depth*_spectrum>=4))
-          cimg_forXYZC(*this,x,y,z,c) { // Without threshold.
-            const int
-              x0 = x - hl, y0 = y - hl, z0 = z - hl, x1 = x + hr, y1 = y + hr, z1 = z + hr,
-              nx0 = x0<0?0:x0, ny0 = y0<0?0:y0, nz0 = z0<0?0:z0,
-              nx1 = x1>=width()?width() - 1:x1, ny1 = y1>=height()?height() - 1:y1, nz1 = z1>=depth()?depth() - 1:z1;
-            res(x,y,z,c) = get_crop(nx0,ny0,nz0,c,nx1,ny1,nz1,c).median();
-          }
-      } else {
-#define _cimg_median_sort(a,b) if ((a)>(b)) cimg::swap(a,b)
-        if (res._height!=1) { // 2d
-          if (threshold>0)
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=16 && _height*_spectrum>=4))
-            cimg_forXYC(*this,x,y,c) { // With threshold.
-              const int
-                x0 = x - hl, y0 = y - hl, x1 = x + hr, y1 = y + hr,
-                nx0 = x0<0?0:x0, ny0 = y0<0?0:y0,
-                nx1 = x1>=width()?width() - 1:x1, ny1 = y1>=height()?height() - 1:y1;
-              const float val0 = (float)(*this)(x,y,c);
-              CImg<T> values(n*n);
-              unsigned int nb_values = 0;
-              T *ptrd = values.data();
-              cimg_for_inXY(*this,nx0,ny0,nx1,ny1,p,q)
-                if (cimg::abs((float)(*this)(p,q,c)-val0)<=threshold) { *(ptrd++) = (*this)(p,q,c); ++nb_values; }
-              res(x,y,c) = values.get_shared_points(0,nb_values - 1).median();
-            }
-          else switch (n) { // Without threshold.
-            case 3 : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-              cimg_forC(*this,c) {
-                T I[9] = { (T)0 };
-                cimg_for3x3(*this,x,y,0,c,I,T)
-                  res(x,y,c) = cimg::median(I[0],I[1],I[2],I[3],I[4],I[5],I[6],I[7],I[8]);
-              }
-            } break;
-            case 5 : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-              cimg_forC(*this,c) {
-                T I[25] = { (T)0 };
-                cimg_for5x5(*this,x,y,0,c,I,T)
-                  res(x,y,c) = cimg::median(I[0],I[1],I[2],I[3],I[4],
-                                            I[5],I[6],I[7],I[8],I[9],
-                                            I[10],I[11],I[12],I[13],I[14],
-                                            I[15],I[16],I[17],I[18],I[19],
-                                            I[20],I[21],I[22],I[23],I[24]);
-              }
-            } break;
-            case 7 : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-              cimg_forC(*this,c) {
-                T I[49] = { (T)0 };
-                cimg_for7x7(*this,x,y,0,c,I,T)
-                  res(x,y,c) = cimg::median(I[0],I[1],I[2],I[3],I[4],I[5],I[6],
-                                            I[7],I[8],I[9],I[10],I[11],I[12],I[13],
-                                            I[14],I[15],I[16],I[17],I[18],I[19],I[20],
-                                            I[21],I[22],I[23],I[24],I[25],I[26],I[27],
-                                            I[28],I[29],I[30],I[31],I[32],I[33],I[34],
-                                            I[35],I[36],I[37],I[38],I[39],I[40],I[41],
-                                            I[42],I[43],I[44],I[45],I[46],I[47],I[48]);
-              }
-            } break;
-            default : {
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=16 && _height*_spectrum>=4))
-              cimg_forXYC(*this,x,y,c) {
-                const int
-                  x0 = x - hl, y0 = y - hl, x1 = x + hr, y1 = y + hr,
-                  nx0 = x0<0?0:x0, ny0 = y0<0?0:y0,
-                  nx1 = x1>=width()?width() - 1:x1, ny1 = y1>=height()?height() - 1:y1;
-                res(x,y,c) = get_crop(nx0,ny0,0,c,nx1,ny1,0,c).median();
-              }
-            }
-            }
-        } else { // 1d
-
-          CImg<T> I;
-          if (threshold>0)
-            cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=16 && _spectrum>=2))
-            cimg_forXC(*this,x,c) { // With threshold.
-              const int
-                x0 = x - hl, x1 = x + hr,
-                nx0 = x0<0?0:x0, nx1 = x1>=width()?width() - 1:x1;
-              const float val0 = (float)(*this)(x,c);
-              CImg<T> values(n);
-              unsigned int nb_values = 0;
-              T *ptrd = values.data();
-              cimg_for_inX(*this,nx0,nx1,p)
-                if (cimg::abs((float)(*this)(p,c)-val0)<=threshold) { *(ptrd++) = (*this)(p,c); ++nb_values; }
-              res(x,c) = values.get_shared_points(0,nb_values - 1).median();
-            }
-          else switch (n) { // Without threshold.
-            case 2 : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-              cimg_forC(*this,c) {
-                I.assign(4);
-                cimg_for2x2(*this,x,y,0,c,I,T) res(x,c) = (T)(0.5f*(I[0] + I[1]));
-              }
-            } break;
-            case 3 : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-              cimg_forC(*this,c) {
-                I.assign(9);
-                cimg_for3x3(*this,x,y,0,c,I,T)
-                  res(x,c) = I[3]<I[4]?(I[4]<I[5]?I[4]:(I[3]<I[5]?I[5]:I[3])):(I[3]<I[5]?I[3]:(I[4]<I[5]?I[5]:I[4]));
-              }
-            } break;
-            default : {
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=16 && _spectrum>=2))
-              cimg_forXC(*this,x,c) {
-                const int
-                  x0 = x - hl, x1 = x + hr,
-                  nx0 = x0<0?0:x0, nx1 = x1>=width()?width() - 1:x1;
-                res(x,c) = get_crop(nx0,0,0,c,nx1,0,0,c).median();
-              }
-            }
-            }
-        }
-      }
-      return res;
-    }
-
-    //! Sharpen image.
-    /**
-       \param amplitude Sharpening amplitude
-       \param sharpen_type Select sharpening method. Can be <tt>{ false=inverse diffusion | true=shock filters }</tt>.
-       \param edge Edge threshold (shock filters only).
-       \param alpha Gradient smoothness (shock filters only).
-       \param sigma Tensor smoothness (shock filters only).
-    **/
-    CImg<T>& sharpen(const float amplitude, const bool sharpen_type=false, const float edge=1,
-                     const float alpha=0, const float sigma=0) {
-      if (is_empty()) return *this;
-      T val_min, val_max = max_min(val_min);
-      const float nedge = edge/2;
-      CImg<Tfloat> velocity(_width,_height,_depth,_spectrum), _veloc_max(_spectrum);
-
-      if (_depth>1) { // 3d
-        if (sharpen_type) { // Shock filters.
-          CImg<Tfloat> G = (alpha>0?get_blur(alpha).get_structure_tensors():get_structure_tensors());
-          if (sigma>0) G.blur(sigma);
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=32 && _height*_depth>=16))
-          cimg_forYZ(G,y,z) {
-            Tfloat *ptrG0 = G.data(0,y,z,0), *ptrG1 = G.data(0,y,z,1),
-              *ptrG2 = G.data(0,y,z,2), *ptrG3 = G.data(0,y,z,3);
-            CImg<Tfloat> val, vec;
-            cimg_forX(G,x) {
-              G.get_tensor_at(x,y,z).symmetric_eigen(val,vec);
-              if (val[0]<0) val[0] = 0;
-              if (val[1]<0) val[1] = 0;
-              if (val[2]<0) val[2] = 0;
-              *(ptrG0++) = vec(0,0);
-              *(ptrG1++) = vec(0,1);
-              *(ptrG2++) = vec(0,2);
-              *(ptrG3++) = 1 - (Tfloat)std::pow(1 + val[0] + val[1] + val[2],-(Tfloat)nedge);
-            }
-          }
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=512 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat *ptrd = velocity.data(0,0,0,c), veloc_max = 0;
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              const Tfloat
-                u = G(x,y,z,0),
-                v = G(x,y,z,1),
-                w = G(x,y,z,2),
-                amp = G(x,y,z,3),
-                ixx = Incc + Ipcc - 2*Iccc,
-                ixy = (Innc + Ippc - Inpc - Ipnc)/4,
-                ixz = (Incn + Ipcp - Incp - Ipcn)/4,
-                iyy = Icnc + Icpc - 2*Iccc,
-                iyz = (Icnn + Icpp - Icnp - Icpn)/4,
-                izz = Iccn + Iccp - 2*Iccc,
-                ixf = Incc - Iccc,
-                ixb = Iccc - Ipcc,
-                iyf = Icnc - Iccc,
-                iyb = Iccc - Icpc,
-                izf = Iccn - Iccc,
-                izb = Iccc - Iccp,
-                itt = u*u*ixx + v*v*iyy + w*w*izz + 2*u*v*ixy + 2*u*w*ixz + 2*v*w*iyz,
-                it = u*cimg::minmod(ixf,ixb) + v*cimg::minmod(iyf,iyb) + w*cimg::minmod(izf,izb),
-                veloc = -amp*cimg::sign(itt)*cimg::abs(it);
-              *(ptrd++) = veloc;
-              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-            }
-            _veloc_max[c] = veloc_max;
-          }
-        } else  // Inverse diffusion.
-          cimg_forC(*this,c) {
-            Tfloat *ptrd = velocity.data(0,0,0,c), veloc_max = 0;
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              const Tfloat veloc = -Ipcc - Incc - Icpc - Icnc - Iccp - Iccn + 6*Iccc;
-              *(ptrd++) = veloc;
-              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-            }
-            _veloc_max[c] = veloc_max;
-          }
-      } else { // 2d.
-        if (sharpen_type) { // Shock filters.
-          CImg<Tfloat> G = (alpha>0?get_blur(alpha).get_structure_tensors():get_structure_tensors());
-          if (sigma>0) G.blur(sigma);
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=32 && _height>=16))
-          cimg_forY(G,y) {
-            CImg<Tfloat> val, vec;
-            Tfloat *ptrG0 = G.data(0,y,0,0), *ptrG1 = G.data(0,y,0,1), *ptrG2 = G.data(0,y,0,2);
-            cimg_forX(G,x) {
-              G.get_tensor_at(x,y).symmetric_eigen(val,vec);
-              if (val[0]<0) val[0] = 0;
-              if (val[1]<0) val[1] = 0;
-              *(ptrG0++) = vec(0,0);
-              *(ptrG1++) = vec(0,1);
-              *(ptrG2++) = 1 - (Tfloat)std::pow(1 + val[0] + val[1],-(Tfloat)nedge);
-            }
-          }
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height>=512 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat *ptrd = velocity.data(0,0,0,c), veloc_max = 0;
-            CImg_3x3(I,Tfloat);
-            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
-              const Tfloat
-                u = G(x,y,0),
-                v = G(x,y,1),
-                amp = G(x,y,2),
-                ixx = Inc + Ipc - 2*Icc,
-                ixy = (Inn + Ipp - Inp - Ipn)/4,
-                iyy = Icn + Icp - 2*Icc,
-                ixf = Inc - Icc,
-                ixb = Icc - Ipc,
-                iyf = Icn - Icc,
-                iyb = Icc - Icp,
-                itt = u*u*ixx + v*v*iyy + 2*u*v*ixy,
-                it = u*cimg::minmod(ixf,ixb) + v*cimg::minmod(iyf,iyb),
-                veloc = -amp*cimg::sign(itt)*cimg::abs(it);
-              *(ptrd++) = veloc;
-              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-            }
-            _veloc_max[c] = veloc_max;
-          }
-        } else // Inverse diffusion.
-          cimg_forC(*this,c) {
-            Tfloat *ptrd = velocity.data(0,0,0,c), veloc_max = 0;
-            CImg_3x3(I,Tfloat);
-            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
-              const Tfloat veloc = -Ipc - Inc - Icp - Icn + 4*Icc;
-              *(ptrd++) = veloc;
-              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-            }
-            _veloc_max[c] = veloc_max;
-          }
-      }
-      const Tfloat veloc_max = _veloc_max.max();
-      if (veloc_max<=0) return *this;
-      return ((velocity*=amplitude/veloc_max)+=*this).cut(val_min,val_max).move_to(*this);
-    }
-
-    //! Sharpen image \newinstance.
-    CImg<T> get_sharpen(const float amplitude, const bool sharpen_type=false, const float edge=1,
-                        const float alpha=0, const float sigma=0) const {
-      return (+*this).sharpen(amplitude,sharpen_type,edge,alpha,sigma);
-    }
-
-    //! Return image gradient.
-    /**
-       \param axes Axes considered for the gradient computation, as a C-string (e.g "xy").
-       \param scheme = Numerical scheme used for the gradient computation:
-       - -1 = Backward finite differences
-       - 0 = Centered finite differences
-       - 1 = Forward finite differences
-       - 2 = Using Sobel kernels
-       - 3 = Using rotation invariant kernels
-       - 4 = Using Deriche recusrsive filter.
-       - 5 = Using Van Vliet recusrsive filter.
-    **/
-    CImgList<Tfloat> get_gradient(const char *const axes=0, const int scheme=3) const {
-      CImgList<Tfloat> grad(2,_width,_height,_depth,_spectrum);
-      bool is_3d = false;
-      if (axes) {
-        for (unsigned int a = 0; axes[a]; ++a) {
-          const char axis = cimg::lowercase(axes[a]);
-          switch (axis) {
-          case 'x' : case 'y' : break;
-          case 'z' : is_3d = true; break;
-          default :
-            throw CImgArgumentException(_cimg_instance
-                                        "get_gradient(): Invalid specified axis '%c'.",
-                                        cimg_instance,
-                                        axis);
-          }
-        }
-      } else is_3d = (_depth>1);
-      if (is_3d) {
-        CImg<Tfloat>(_width,_height,_depth,_spectrum).move_to(grad);
-        switch (scheme) { // 3d.
-        case -1 : { // Backward finite differences.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            const ulongT off = (ulongT)c*_width*_height*_depth;
-            Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off, *ptrd2 = grad[2]._data + off;
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              *(ptrd0++) = Iccc - Ipcc;
-              *(ptrd1++) = Iccc - Icpc;
-              *(ptrd2++) = Iccc - Iccp;
-            }
-          }
-        } break;
-        case 1 : { // Forward finite differences.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            const ulongT off = (ulongT)c*_width*_height*_depth;
-            Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off, *ptrd2 = grad[2]._data + off;
-            CImg_2x2x2(I,Tfloat);
-            cimg_for2x2x2(*this,x,y,z,c,I,Tfloat) {
-              *(ptrd0++) = Incc - Iccc;
-              *(ptrd1++) = Icnc - Iccc;
-              *(ptrd2++) = Iccn - Iccc;
-            }
-          }
-        } break;
-        case 4 : { // Deriche filter with low standard variation.
-          grad[0] = get_deriche(0,1,'x');
-          grad[1] = get_deriche(0,1,'y');
-          grad[2] = get_deriche(0,1,'z');
-        } break;
-        case 5 : { // Van Vliet filter with low standard variation.
-          grad[0] = get_vanvliet(0,1,'x');
-          grad[1] = get_vanvliet(0,1,'y');
-          grad[2] = get_vanvliet(0,1,'z');
-        } break;
-        default : { // Central finite differences.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            const ulongT off = (ulongT)c*_width*_height*_depth;
-            Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off, *ptrd2 = grad[2]._data + off;
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              *(ptrd0++) = (Incc - Ipcc)/2;
-              *(ptrd1++) = (Icnc - Icpc)/2;
-              *(ptrd2++) = (Iccn - Iccp)/2;
-            }
-          }
-        }
-        }
-      } else switch (scheme) { // 2d.
-      case -1 : { // Backward finite differences.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off;
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = Icc - Ipc;
-            *(ptrd1++) = Icc - Icp;
-          }
-        }
-      } break;
-      case 1 : { // Forward finite differences.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off;
-          CImg_2x2(I,Tfloat);
-          cimg_for2x2(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = Inc - Icc;
-            *(ptrd1++) = Icn - Icc;
-          }
-        }
-      } break;
-      case 2 : { // Sobel scheme.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off;
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = -Ipp - 2*Ipc - Ipn + Inp + 2*Inc + Inn;
-            *(ptrd1++) = -Ipp - 2*Icp - Inp + Ipn + 2*Icn + Inn;
-          }
-        }
-      } break;
-      case 3 : { // Rotation invariant kernel.
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off;
-          CImg_3x3(I,Tfloat);
-          const Tfloat a = (Tfloat)(0.25f*(2 - std::sqrt(2.0f))), b = (Tfloat)(0.5f*(std::sqrt(2.0f) - 1));
-          cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = -a*Ipp - b*Ipc - a*Ipn + a*Inp + b*Inc + a*Inn;
-            *(ptrd1++) = -a*Ipp - b*Icp - a*Inp + a*Ipn + b*Icn + a*Inn;
-          }
-        }
-      } break;
-      case 4 : { // Van Vliet filter with low standard variation
-        grad[0] = get_deriche(0,1,'x');
-        grad[1] = get_deriche(0,1,'y');
-      } break;
-      case 5 : { // Deriche filter with low standard variation
-        grad[0] = get_vanvliet(0,1,'x');
-        grad[1] = get_vanvliet(0,1,'y');
-      } break;
-      default : { // Central finite differences
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = grad[0]._data + off, *ptrd1 = grad[1]._data + off;
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = (Inc - Ipc)/2;
-            *(ptrd1++) = (Icn - Icp)/2;
-          }
-        }
-      }
-      }
-      if (!axes) return grad;
-      CImgList<Tfloat> res;
-      for (unsigned int l = 0; axes[l]; ++l) {
-        const char axis = cimg::lowercase(axes[l]);
-        switch (axis) {
-        case 'x' : res.insert(grad[0]); break;
-        case 'y' : res.insert(grad[1]); break;
-        case 'z' : res.insert(grad[2]); break;
-        }
-      }
-      grad.assign();
-      return res;
-    }
-
-    //! Return image hessian.
-    /**
-       \param axes Axes considered for the hessian computation, as a C-string (e.g "xy").
-    **/
-    CImgList<Tfloat> get_hessian(const char *const axes=0) const {
-      CImgList<Tfloat> res;
-      const char *naxes = axes, *const def_axes2d = "xxxyyy", *const def_axes3d = "xxxyxzyyyzzz";
-      if (!axes) naxes = _depth>1?def_axes3d:def_axes2d;
-      const unsigned int lmax = (unsigned int)std::strlen(naxes);
-      if (lmax%2)
-        throw CImgArgumentException(_cimg_instance
-                                    "get_hessian(): Invalid specified axes '%s'.",
-                                    cimg_instance,
-                                    naxes);
-
-      res.assign(lmax/2,_width,_height,_depth,_spectrum);
-      if (!cimg::strcasecmp(naxes,def_axes3d)) { // 3d
-
-        cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-        cimg_forC(*this,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth;
-          Tfloat
-            *ptrd0 = res[0]._data + off, *ptrd1 = res[1]._data + off, *ptrd2 = res[2]._data + off,
-            *ptrd3 = res[3]._data + off, *ptrd4 = res[4]._data + off, *ptrd5 = res[5]._data + off;
-          CImg_3x3x3(I,Tfloat);
-          cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = Ipcc + Incc - 2*Iccc;          // Ixx
-            *(ptrd1++) = (Ippc + Innc - Ipnc - Inpc)/4; // Ixy
-            *(ptrd2++) = (Ipcp + Incn - Ipcn - Incp)/4; // Ixz
-            *(ptrd3++) = Icpc + Icnc - 2*Iccc;          // Iyy
-            *(ptrd4++) = (Icpp + Icnn - Icpn - Icnp)/4; // Iyz
-            *(ptrd5++) = Iccn + Iccp - 2*Iccc;          // Izz
-          }
-        }
-      } else if (!cimg::strcasecmp(naxes,def_axes2d)) { // 2d
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forZC(*this,z,c) {
-          const ulongT off = (ulongT)c*_width*_height*_depth + z*_width*_height;
-          Tfloat *ptrd0 = res[0]._data + off, *ptrd1 = res[1]._data + off, *ptrd2 = res[2]._data + off;
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
-            *(ptrd0++) = Ipc + Inc - 2*Icc;         // Ixx
-            *(ptrd1++) = (Ipp + Inn - Ipn - Inp)/4; // Ixy
-            *(ptrd2++) = Icp + Icn - 2*Icc;         // Iyy
-          }
-        }
-      } else for (unsigned int l = 0; l<lmax; ) { // Version with custom axes.
-          const unsigned int l2 = l/2;
-          char axis1 = naxes[l++], axis2 = naxes[l++];
-          if (axis1>axis2) cimg::swap(axis1,axis2);
-          bool valid_axis = false;
-          if (axis1=='x' && axis2=='x') { // Ixx
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-            cimg_forZC(*this,z,c) {
-              Tfloat *ptrd = res[l2].data(0,0,z,c);
-              CImg_3x3(I,Tfloat);
-              cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Ipc + Inc - 2*Icc;
-            }
-          }
-          else if (axis1=='x' && axis2=='y') { // Ixy
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-            cimg_forZC(*this,z,c) {
-              Tfloat *ptrd = res[l2].data(0,0,z,c);
-              CImg_3x3(I,Tfloat);
-              cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Ipp + Inn - Ipn - Inp)/4;
-            }
-          }
-          else if (axis1=='x' && axis2=='z') { // Ixz
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-            cimg_forC(*this,c) {
-              Tfloat *ptrd = res[l2].data(0,0,0,c);
-              CImg_3x3x3(I,Tfloat);
-              cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Ipcp + Incn - Ipcn - Incp)/4;
-            }
-          }
-          else if (axis1=='y' && axis2=='y') { // Iyy
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-            cimg_forZC(*this,z,c) {
-              Tfloat *ptrd = res[l2].data(0,0,z,c);
-              CImg_3x3(I,Tfloat);
-              cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Icp + Icn - 2*Icc;
-            }
-          }
-          else if (axis1=='y' && axis2=='z') { // Iyz
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-            cimg_forC(*this,c) {
-              Tfloat *ptrd = res[l2].data(0,0,0,c);
-              CImg_3x3x3(I,Tfloat);
-              cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Icpp + Icnn - Icpn - Icnp)/4;
-            }
-          }
-          else if (axis1=='z' && axis2=='z') { // Izz
-            valid_axis = true;
-            cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-            cimg_forC(*this,c) {
-              Tfloat *ptrd = res[l2].data(0,0,0,c);
-              CImg_3x3x3(I,Tfloat);
-              cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Iccn + Iccp - 2*Iccc;
-            }
-          }
-          else if (!valid_axis)
-            throw CImgArgumentException(_cimg_instance
-                                        "get_hessian(): Invalid specified axes '%s'.",
-                                        cimg_instance,
-                                        naxes);
-        }
-      return res;
-    }
-
-    //! Compute image laplacian.
-    CImg<T>& laplacian() {
-      return get_laplacian().move_to(*this);
-    }
-
-    //! Compute image laplacian \newinstance.
-    CImg<Tfloat> get_laplacian() const {
-      if (is_empty()) return CImg<Tfloat>();
-      CImg<Tfloat> res(_width,_height,_depth,_spectrum);
-      if (_depth>1) { // 3d
-        cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-        cimg_forC(*this,c) {
-          Tfloat *ptrd = res.data(0,0,0,c);
-          CImg_3x3x3(I,Tfloat);
-          cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Incc + Ipcc + Icnc + Icpc + Iccn + Iccp - 6*Iccc;
-        }
-      } else if (_height>1) { // 2d
-        cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-        cimg_forC(*this,c) {
-          Tfloat *ptrd = res.data(0,0,0,c);
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,0,c,I,Tfloat) *(ptrd++) = Inc + Ipc + Icn + Icp - 4*Icc;
-        }
-      } else { // 1d
-        cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=1048576 && _height*_depth*_spectrum>=2))
-        cimg_forC(*this,c) {
-          Tfloat *ptrd = res.data(0,0,0,c);
-          CImg_3x3(I,Tfloat);
-          cimg_for3x3(*this,x,y,0,c,I,Tfloat) *(ptrd++) = Inc + Ipc - 2*Icc;
-        }
-      }
-      return res;
-    }
-
-    //! Compute the structure tensor field of an image.
-    /**
-       \param is_fwbw_scheme scheme. Can be <tt>{ false=centered | true=forward-backward }</tt>
-    **/
-    CImg<T>& structure_tensors(const bool is_fwbw_scheme=false) {
-      return get_structure_tensors(is_fwbw_scheme).move_to(*this);
-    }
-
-    //! Compute the structure tensor field of an image \newinstance.
-    CImg<Tfloat> get_structure_tensors(const bool is_fwbw_scheme=false) const {
-      if (is_empty()) return *this;
-      CImg<Tfloat> res;
-      if (_depth>1) { // 3d
-        res.assign(_width,_height,_depth,6,0);
-        if (!is_fwbw_scheme) { // Classical central finite differences
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat
-              *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
-              *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              const Tfloat
-                ix = (Incc - Ipcc)/2,
-                iy = (Icnc - Icpc)/2,
-                iz = (Iccn - Iccp)/2;
-              *(ptrd0++)+=ix*ix;
-              *(ptrd1++)+=ix*iy;
-              *(ptrd2++)+=ix*iz;
-              *(ptrd3++)+=iy*iy;
-              *(ptrd4++)+=iy*iz;
-              *(ptrd5++)+=iz*iz;
-            }
-          }
-        } else { // Forward/backward finite differences.
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height*_depth>=1048576 && _spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat
-              *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
-              *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
-            CImg_3x3x3(I,Tfloat);
-            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
-              const Tfloat
-                ixf = Incc - Iccc, ixb = Iccc - Ipcc,
-                iyf = Icnc - Iccc, iyb = Iccc - Icpc,
-                izf = Iccn - Iccc, izb = Iccc - Iccp;
-              *(ptrd0++)+=(ixf*ixf + ixb*ixb)/2;
-              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
-              *(ptrd2++)+=(ixf*izf + ixf*izb + ixb*izf + ixb*izb)/4;
-              *(ptrd3++)+=(iyf*iyf + iyb*iyb)/2;
-              *(ptrd4++)+=(iyf*izf + iyf*izb + iyb*izf + iyb*izb)/4;
-              *(ptrd5++)+=(izf*izf + izb*izb)/2;
-            }
-          }
-        }
-      } else { // 2d
-        res.assign(_width,_height,_depth,3,0);
-        if (!is_fwbw_scheme) { // Classical central finite differences
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
-            CImg_3x3(I,Tfloat);
-            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
-              const Tfloat
-                ix = (Inc - Ipc)/2,
-                iy = (Icn - Icp)/2;
-              *(ptrd0++)+=ix*ix;
-              *(ptrd1++)+=ix*iy;
-              *(ptrd2++)+=iy*iy;
-            }
-          }
-        } else { // Forward/backward finite differences (version 2).
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width*_height>=1048576 && _depth*_spectrum>=2))
-          cimg_forC(*this,c) {
-            Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
-            CImg_3x3(I,Tfloat);
-            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
-              const Tfloat
-                ixf = Inc - Icc, ixb = Icc - Ipc,
-                iyf = Icn - Icc, iyb = Icc - Icp;
-              *(ptrd0++)+=(ixf*ixf + ixb*ixb)/2;
-              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
-              *(ptrd2++)+=(iyf*iyf + iyb*iyb)/2;
-            }
-          }
-        }
-      }
-      return res;
-    }
-
-    //! Compute field of diffusion tensors for edge-preserving smoothing.
-    /**
-       \param sharpness Sharpness
-       \param anisotropy Anisotropy
-       \param alpha Standard deviation of the gradient blur.
-       \param sigma Standard deviation of the structure tensor blur.
-       \param is_sqrt Tells if the square root of the tensor field is computed instead.
-    **/
-    CImg<T>& diffusion_tensors(const float sharpness=0.7f, const float anisotropy=0.6f,
-                               const float alpha=0.6f, const float sigma=1.1f, const bool is_sqrt=false) {
-      CImg<Tfloat> res;
-      const float
-        nsharpness = std::max(sharpness,1e-5f),
-        power1 = (is_sqrt?0.5f:1)*nsharpness,
-        power2 = power1/(1e-7f + 1 - anisotropy);
-      blur(alpha).normalize(0,(T)255);
-
-      if (_depth>1) { // 3d
-        get_structure_tensors().move_to(res).blur(sigma);
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=256 && _height*_depth>=256))
-        cimg_forYZ(*this,y,z) {
-          Tfloat
-            *ptrd0 = res.data(0,y,z,0), *ptrd1 = res.data(0,y,z,1), *ptrd2 = res.data(0,y,z,2),
-            *ptrd3 = res.data(0,y,z,3), *ptrd4 = res.data(0,y,z,4), *ptrd5 = res.data(0,y,z,5);
-          CImg<floatT> val(3), vec(3,3);
-          cimg_forX(*this,x) {
-            res.get_tensor_at(x,y,z).symmetric_eigen(val,vec);
-            const float
-              _l1 = val[2], _l2 = val[1], _l3 = val[0],
-              l1 = _l1>0?_l1:0, l2 = _l2>0?_l2:0, l3 = _l3>0?_l3:0,
-              ux = vec(0,0), uy = vec(0,1), uz = vec(0,2),
-              vx = vec(1,0), vy = vec(1,1), vz = vec(1,2),
-              wx = vec(2,0), wy = vec(2,1), wz = vec(2,2),
-              n1 = (float)std::pow(1 + l1 + l2 + l3,-power1),
-              n2 = (float)std::pow(1 + l1 + l2 + l3,-power2);
-            *(ptrd0++) = n1*(ux*ux + vx*vx) + n2*wx*wx;
-            *(ptrd1++) = n1*(ux*uy + vx*vy) + n2*wx*wy;
-            *(ptrd2++) = n1*(ux*uz + vx*vz) + n2*wx*wz;
-            *(ptrd3++) = n1*(uy*uy + vy*vy) + n2*wy*wy;
-            *(ptrd4++) = n1*(uy*uz + vy*vz) + n2*wy*wz;
-            *(ptrd5++) = n1*(uz*uz + vz*vz) + n2*wz*wz;
-          }
-        }
-      } else { // for 2d images
-        get_structure_tensors().move_to(res).blur(sigma);
-        cimg_pragma_openmp(parallel for cimg_openmp_if(_width>=256 && _height>=256))
-        cimg_forY(*this,y) {
-          Tfloat *ptrd0 = res.data(0,y,0,0), *ptrd1 = res.data(0,y,0,1), *ptrd2 = res.data(0,y,0,2);
-          CImg<floatT> val(2), vec(2,2);
-          cimg_forX(*this,x) {
-            res.get_tensor_at(x,y).symmetric_eigen(val,vec);
-            const float
-              _l1 = val[1], _l2 = val[0],
-              l1 = _l1>0?_l1:0, l2 = _l2>0?_l2:0,
-              ux = vec(1,0), uy = vec(1,1),
-              vx = vec(0,0), vy = vec(0,1),
-              n1 = (float)std::pow(1 + l1 + l2,-power1),
-              n2 = (float)std::pow(1 + l1 + l2,-power2);
-            *(ptrd0++) = n1*ux*ux + n2*vx*vx;
-            *(ptrd1++) = n1*ux*uy + n2*vx*vy;
-            *(ptrd2++) = n1*uy*uy + n2*vy*vy;
-          }
-        }
-      }
-      return res.move_to(*this);
-    }
-
-    //! Compute field of diffusion tensors for edge-preserving smoothing \newinstance.
-    CImg<Tfloat> get_diffusion_tensors(const float sharpness=0.7f, const float anisotropy=0.6f,
-                                       const float alpha=0.6f, const float sigma=1.1f, const bool is_sqrt=false) const {
-      return CImg<Tfloat>(*this,false).diffusion_tensors(sharpness,anisotropy,alpha,sigma,is_sqrt);
-    }
-
-    //! Estimate displacement field between two images.
-    /**
-       \param source Reference image.
-       \param smoothness Smoothness of estimated displacement field.
-       \param precision Precision required for algorithm convergence.
-       \param nb_scales Number of scales used to estimate the displacement field.
-       \param iteration_max Maximum number of iterations allowed for one scale.
-       \param is_backward If false, match I2(X + U(X)) = I1(X), else match I2(X) = I1(X - U(X)).
-       \param guide Image used as the initial correspondence estimate for the algorithm.
-       'guide' may have a last channel with boolean values (0=false | other=true) that
-       tells for each pixel if its correspondence vector is constrained to its initial value (constraint mask).
-    **/
-    CImg<T>& displacement(const CImg<T>& source, const float smoothness=0.1f, const float precision=5.0f,
-                          const unsigned int nb_scales=0, const unsigned int iteration_max=10000,
-                          const bool is_backward=false,
-                          const CImg<floatT>& guide=CImg<floatT>::const_empty()) {
-      return get_displacement(source,smoothness,precision,nb_scales,iteration_max,is_backward,guide).
-        move_to(*this);
-    }
-
-    //! Estimate displacement field between two images \newinstance.
-    CImg<floatT> get_displacement(const CImg<T>& source,
-                                  const float smoothness=0.1f, const float precision=5.0f,
-                                  const unsigned int nb_scales=0, const unsigned int iteration_max=10000,
-                                  const bool is_backward=false,
-                                  const CImg<floatT>& guide=CImg<floatT>::const_empty()) const {
-      if (is_empty() || !source) return +*this;
-      if (!is_sameXYZC(source))
-        throw CImgArgumentException(_cimg_instance
-                                    "displacement(): Instance and source image (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    source._width,source._height,source._depth,source._spectrum,source._data);
-      if (precision<0)
-        throw CImgArgumentException(_cimg_instance
-                                    "displacement(): Invalid specified precision %g "
-                                    "(should be >=0)",
-                                    cimg_instance,
-                                    precision);
-
-      const bool is_3d = source._depth>1;
-      const unsigned int constraint = is_3d?3:2;
-
-      if (guide &&
-          (guide._width!=_width || guide._height!=_height || guide._depth!=_depth || guide._spectrum<constraint))
-        throw CImgArgumentException(_cimg_instance
-                                    "displacement(): Specified guide (%u,%u,%u,%u,%p) "
-                                    "has invalid dimensions.",
-                                    cimg_instance,
-                                    guide._width,guide._height,guide._depth,guide._spectrum,guide._data);
-
-      const unsigned int
-        mins = is_3d?cimg::min(_width,_height,_depth):std::min(_width,_height),
-        _nb_scales = nb_scales>0?nb_scales:
-        (unsigned int)cimg::round(std::log(mins/8.0)/std::log(1.5),1,1);
-
-      const float _precision = (float)std::pow(10.0,-(double)precision);
-      float sm, sM = source.max_min(sm), tm, tM = max_min(tm);
-      const float sdelta = sm==sM?1:(sM - sm), tdelta = tm==tM?1:(tM - tm);
-
-      CImg<floatT> U, V;
-      floatT bound = 0;
-      for (int scale = (int)_nb_scales - 1; scale>=0; --scale) {
-        const float factor = (float)std::pow(1.5,(double)scale);
-        const unsigned int
-          _sw = (unsigned int)(_width/factor), sw = _sw?_sw:1,
-          _sh = (unsigned int)(_height/factor), sh = _sh?_sh:1,
-          _sd = (unsigned int)(_depth/factor), sd = _sd?_sd:1;
-        if (sw<5 && sh<5 && (!is_3d || sd<5)) continue;  // skip too small scales.
-        const CImg<Tfloat>
-          I1 = (source.get_resize(sw,sh,sd,-100,2)-=sm)/=sdelta,
-          I2 = (get_resize(I1,2)-=tm)/=tdelta;
-        if (guide._spectrum>constraint) guide.get_resize(I2._width,I2._height,I2._depth,-100,1).move_to(V);
-        if (U) (U*=1.5f).resize(I2._width,I2._height,I2._depth,-100,3);
-        else {
-          if (guide)
-            guide.get_shared_channels(0,is_3d?2:1).get_resize(I2._width,I2._height,I2._depth,-100,2).move_to(U);
-          else U.assign(I2._width,I2._height,I2._depth,is_3d?3:2,0);
-        }
-
-        float dt = 2, energy = cimg::type<float>::max();
-        const CImgList<Tfloat> dI = is_backward?I1.get_gradient():I2.get_gradient();
-
-        for (unsigned int iteration = 0; iteration<iteration_max; ++iteration) {
-          cimg_abort_test();
-          float _energy = 0;
-
-          if (is_3d) { // 3d version.
-            if (smoothness>=0) // Isotropic regularization.
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_height*_depth>=8 && _width>=16)
-                                 reduction(+:_energy))
-              cimg_forYZ(U,y,z) {
-                const int
-                  _p1y = y?y - 1:0, _n1y = y<U.height() - 1?y + 1:y,
-                  _p1z = z?z - 1:0, _n1z = z<U.depth() - 1?z + 1:z;
-                cimg_for3X(U,x) {
-                  const float
-                    X = is_backward?x - U(x,y,z,0):x + U(x,y,z,0),
-                    Y = is_backward?y - U(x,y,z,1):y + U(x,y,z,1),
-                    Z = is_backward?z - U(x,y,z,2):z + U(x,y,z,2);
-                  float delta_I = 0, _energy_regul = 0;
-                  if (is_backward) cimg_forC(I2,c) delta_I+=(float)(I1._linear_atXYZ(X,Y,Z,c) - I2(x,y,z,c));
-                  else cimg_forC(I2,c) delta_I+=(float)(I1(x,y,z,c) - I2._linear_atXYZ(X,Y,Z,c));
-                  cimg_forC(U,c) {
-                    const float
-                      Ux = 0.5f*(U(_n1x,y,z,c) - U(_p1x,y,z,c)),
-                      Uy = 0.5f*(U(x,_n1y,z,c) - U(x,_p1y,z,c)),
-                      Uz = 0.5f*(U(x,y,_n1z,c) - U(x,y,_p1z,c)),
-                      Uxx = U(_n1x,y,z,c) + U(_p1x,y,z,c),
-                      Uyy = U(x,_n1y,z,c) + U(x,_p1y,z,c),
-                      Uzz = U(x,y,_n1z,c) + U(x,y,_p1z,c);
-                    U(x,y,z,c) = (float)(U(x,y,z,c) + dt*(delta_I*dI[c]._linear_atXYZ(X,Y,Z) +
-                                                          smoothness* ( Uxx + Uyy + Uzz)))/(1 + 6*smoothness*dt);
-                    _energy_regul+=Ux*Ux + Uy*Uy + Uz*Uz;
-                  }
-                  if (is_backward) { // Constraint displacement vectors to stay in image.
-                    if (U(x,y,z,0)>x) U(x,y,z,0) = (float)x;
-                    if (U(x,y,z,1)>y) U(x,y,z,1) = (float)y;
-                    if (U(x,y,z,2)>z) U(x,y,z,2) = (float)z;
-                    bound = (float)x - _width; if (U(x,y,z,0)<=bound) U(x,y,z,0) = bound;
-                    bound = (float)y - _height; if (U(x,y,z,1)<=bound) U(x,y,z,1) = bound;
-                    bound = (float)z - _depth; if (U(x,y,z,2)<=bound) U(x,y,z,2) = bound;
-                  } else {
-                    if (U(x,y,z,0)<-x) U(x,y,z,0) = -(float)x;
-                    if (U(x,y,z,1)<-y) U(x,y,z,1) = -(float)y;
-                    if (U(x,y,z,2)<-z) U(x,y,z,2) = -(float)z;
-                    bound = (float)_width - x; if (U(x,y,z,0)>=bound) U(x,y,z,0) = bound;
-                    bound = (float)_height - y; if (U(x,y,z,1)>=bound) U(x,y,z,1) = bound;
-                    bound = (float)_depth - z; if (U(x,y,z,2)>=bound) U(x,y,z,2) = bound;
-                  }
-                  _energy+=delta_I*delta_I + smoothness*_energy_regul;
-                }
-                if (V) cimg_forXYZ(V,x,y,z) if (V(x,y,z,3)) { // Apply constraints.
-                    U(x,y,z,0) = V(x,y,z,0)/factor;
-                    U(x,y,z,1) = V(x,y,z,1)/factor;
-                    U(x,y,z,2) = V(x,y,z,2)/factor;
-                  }
-              } else { // Anisotropic regularization.
-              const float nsmoothness = -smoothness;
-              cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_height*_depth>=8 && _width>=16)
-                                 reduction(+:_energy))
-              cimg_forYZ(U,y,z) {
-                const int
-                  _p1y = y?y - 1:0, _n1y = y<U.height() - 1?y + 1:y,
-                  _p1z = z?z - 1:0, _n1z = z<U.depth() - 1?z + 1:z;
-                cimg_for3X(U,x) {
-                  const float
-                    X = is_backward?x - U(x,y,z,0):x + U(x,y,z,0),
-                    Y = is_backward?y - U(x,y,z,1):y + U(x,y,z,1),
-                    Z = is_backward?z - U(x,y,z,2):z + U(x,y,z,2);
-                  float delta_I = 0, _energy_regul = 0;
-                  if (is_backward) cimg_forC(I2,c) delta_I+=(float)(I1._linear_atXYZ(X,Y,Z,c) - I2(x,y,z,c));
-                  else cimg_forC(I2,c) delta_I+=(float)(I1(x,y,z,c) - I2._linear_atXYZ(X,Y,Z,c));
-                  cimg_forC(U,c) {
-                    const float
-                      Ux = 0.5f*(U(_n1x,y,z,c) - U(_p1x,y,z,c)),
-                      Uy = 0.5f*(U(x,_n1y,z,c) - U(x,_p1y,z,c)),
-                      Uz = 0.5f*(U(x,y,_n1z,c) - U(x,y,_p1z,c)),
-                      N2 = Ux*Ux + Uy*Uy + Uz*Uz,
-                      N = std::sqrt(N2),
-                      N3 = 1e-5f + N2*N,
-                      coef_a = (1 - Ux*Ux/N2)/N,
-                      coef_b = -2*Ux*Uy/N3,
-                      coef_c = -2*Ux*Uz/N3,
-                      coef_d = (1 - Uy*Uy/N2)/N,
-                      coef_e = -2*Uy*Uz/N3,
-                      coef_f = (1 - Uz*Uz/N2)/N,
-                      Uxx = U(_n1x,y,z,c) + U(_p1x,y,z,c),
-                      Uyy = U(x,_n1y,z,c) + U(x,_p1y,z,c),
-                      Uzz = U(x,y,_n1z,c) + U(x,y,_p1z,c),
-                      Uxy = 0.25f*(U(_n1x,_n1y,z,c) + U(_p1x,_p1y,z,c) - U(_n1x,_p1y,z,c) - U(_n1x,_p1y,z,c)),
-                      Uxz = 0.25f*(U(_n1x,y,_n1z,c) + U(_p1x,y,_p1z,c) - U(_n1x,y,_p1z,c) - U(_n1x,y,_p1z,c)),
-                      Uyz = 0.25f*(U(x,_n1y,_n1z,c) + U(x,_p1y,_p1z,c) - U(x,_n1y,_p1z,c) - U(x,_n1y,_p1z,c));
-                    U(x,y,z,c) = (float)(U(x,y,z,c) + dt*(delta_I*dI[c]._linear_atXYZ(X,Y,Z) +
-                                                          nsmoothness* ( coef_a*Uxx + coef_b*Uxy +
-                                                                         coef_c*Uxz + coef_d*Uyy +
-                                                                         coef_e*Uyz + coef_f*Uzz ))
-                                         )/(1 + 2*(coef_a + coef_d + coef_f)*nsmoothness*dt);
-                    _energy_regul+=N;
-                  }
-                  if (is_backward) { // Constraint displacement vectors to stay in image.
-                    if (U(x,y,z,0)>x) U(x,y,z,0) = (float)x;
-                    if (U(x,y,z,1)>y) U(x,y,z,1) = (float)y;
-                    if (U(x,y,z,2)>z) U(x,y,z,2) = (float)z;
-                    bound = (float)x - _width; if (U(x,y,z,0)<=bound) U(x,y,z,0) = bound;
-                    bound = (float)y - _height; if (U(x,y,z,1)<=bound) U(x,y,z,1) = bound;
-                    bound = (float)z - _depth; if (U(x,y,z,2)<=bound) U(x,y,z,2) = bound;
-                  } else {
-                    if (U(x,y,z,0)<-x) U(x,y,z,0) = -(float)x;
-                    if (U(x,y,z,1)<-y) U(x,y,z,1) = -(float)y;
-                    if (U(x,y,z,2)<-z) U(x,y,z,2) = -(float)z;
-                    bound = (float)_width - x; if (U(x,y,z,0)>=bound) U(x,y,z,0) = bound;
-                    bound = (float)_height - y; if (U(x,y,z,1)>=bound) U(x,y,z,1) = bound;
-                    bound = (float)_depth - z; if (U(x,y,z,2)>=bound) U(x,y,z,2) = bound;
-                  }
-                  _energy+=delta_I*delta_I + nsmoothness*_energy_regul;
-                }
-                if (V) cimg_forXYZ(V,x,y,z) if (V(x,y,z,3)) { // Apply constraints.
-                    U(x,y,z,0) = V(x,y,z,0)/factor;
-                    U(x,y,z,1) = V(x,y,z,1)/factor;
-                    U(x,y,z,2) = V(x,y,z,2)/factor;
-                  }
-              }
-            }
-          } else { // 2d version.
-            if (smoothness>=0) // Isotropic regularization.
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_height>=8 && _width>=16) reduction(+:_energy))
-              cimg_forY(U,y) {
-                const int _p1y = y?y - 1:0, _n1y = y<U.height() - 1?y + 1:y;
-                cimg_for3X(U,x) {
-                  const float
-                    X = is_backward?x - U(x,y,0):x + U(x,y,0),
-                    Y = is_backward?y - U(x,y,1):y + U(x,y,1);
-                  float delta_I = 0, _energy_regul = 0;
-                  if (is_backward) cimg_forC(I2,c) delta_I+=(float)(I1._linear_atXY(X,Y,c) - I2(x,y,c));
-                  else cimg_forC(I2,c) delta_I+=(float)(I1(x,y,c) - I2._linear_atXY(X,Y,c));
-                  cimg_forC(U,c) {
-                    const float
-                      Ux = 0.5f*(U(_n1x,y,c) - U(_p1x,y,c)),
-                      Uy = 0.5f*(U(x,_n1y,c) - U(x,_p1y,c)),
-                      Uxx = U(_n1x,y,c) + U(_p1x,y,c),
-                      Uyy = U(x,_n1y,c) + U(x,_p1y,c);
-                    U(x,y,c) = (float)(U(x,y,c) + dt*(delta_I*dI[c]._linear_atXY(X,Y) +
-                                                      smoothness*( Uxx + Uyy )))/(1 + 4*smoothness*dt);
-                    _energy_regul+=Ux*Ux + Uy*Uy;
-                  }
-                  if (is_backward) { // Constraint displacement vectors to stay in image.
-                    if (U(x,y,0)>x) U(x,y,0) = (float)x;
-                    if (U(x,y,1)>y) U(x,y,1) = (float)y;
-                    bound = (float)x - _width; if (U(x,y,0)<=bound) U(x,y,0) = bound;
-                    bound = (float)y - _height; if (U(x,y,1)<=bound) U(x,y,1) = bound;
-                  } else {
-                    if (U(x,y,0)<-x) U(x,y,0) = -(float)x;
-                    if (U(x,y,1)<-y) U(x,y,1) = -(float)y;
-                    bound = (float)_width - x; if (U(x,y,0)>=bound) U(x,y,0) = bound;
-                    bound = (float)_height - y; if (U(x,y,1)>=bound) U(x,y,1) = bound;
-                  }
-                  _energy+=delta_I*delta_I + smoothness*_energy_regul;
-                }
-                if (V) cimg_forX(V,x) if (V(x,y,2)) { // Apply constraints.
-                    U(x,y,0) = V(x,y,0)/factor;
-                    U(x,y,1) = V(x,y,1)/factor;
-                  }
-              } else { // Anisotropic regularization.
-              const float nsmoothness = -smoothness;
-              cimg_pragma_openmp(parallel for cimg_openmp_if(_height>=8 && _width>=16) reduction(+:_energy))
-              cimg_forY(U,y) {
-                const int _p1y = y?y - 1:0, _n1y = y<U.height() - 1?y + 1:y;
-                cimg_for3X(U,x) {
-                  const float
-                    X = is_backward?x - U(x,y,0):x + U(x,y,0),
-                    Y = is_backward?y - U(x,y,1):y + U(x,y,1);
-                  float delta_I = 0, _energy_regul = 0;
-                  if (is_backward) cimg_forC(I2,c) delta_I+=(float)(I1._linear_atXY(X,Y,c) - I2(x,y,c));
-                  else cimg_forC(I2,c) delta_I+=(float)(I1(x,y,c) - I2._linear_atXY(X,Y,c));
-                  cimg_forC(U,c) {
-                    const float
-                      Ux = 0.5f*(U(_n1x,y,c) - U(_p1x,y,c)),
-                      Uy = 0.5f*(U(x,_n1y,c) - U(x,_p1y,c)),
-                      N2 = Ux*Ux + Uy*Uy,
-                      N = std::sqrt(N2),
-                      N3 = 1e-5f + N2*N,
-                      coef_a = Uy*Uy/N3,
-                      coef_b = -2*Ux*Uy/N3,
-                      coef_c = Ux*Ux/N3,
-                      Uxx = U(_n1x,y,c) + U(_p1x,y,c),
-                      Uyy = U(x,_n1y,c) + U(x,_p1y,c),
-                      Uxy = 0.25f*(U(_n1x,_n1y,c) + U(_p1x,_p1y,c) - U(_n1x,_p1y,c) - U(_n1x,_p1y,c));
-                    U(x,y,c) = (float)(U(x,y,c) + dt*(delta_I*dI[c]._linear_atXY(X,Y) +
-                                                      nsmoothness*( coef_a*Uxx + coef_b*Uxy + coef_c*Uyy )))/
-                      (1 + 2*(coef_a + coef_c)*nsmoothness*dt);
-                    _energy_regul+=N;
-                  }
-                  if (is_backward) { // Constraint displacement vectors to stay in image.
-                    if (U(x,y,0)>x) U(x,y,0) = (float)x;
-                    if (U(x,y,1)>y) U(x,y,1) = (float)y;
-                    bound = (float)x - _width; if (U(x,y,0)<=bound) U(x,y,0) = bound;
-                    bound = (float)y - _height; if (U(x,y,1)<=bound) U(x,y,1) = bound;
-                  } else {
-                    if (U(x,y,0)<-x) U(x,y,0) = -(float)x;
-                    if (U(x,y,1)<-y) U(x,y,1) = -(float)y;
-                    bound = (float)_width - x; if (U(x,y,0)>=bound) U(x,y,0) = bound;
-                    bound = (float)_height - y; if (U(x,y,1)>=bound) U(x,y,1) = bound;
-                  }
-                  _energy+=delta_I*delta_I + nsmoothness*_energy_regul;
-                }
-                if (V) cimg_forX(V,x) if (V(x,y,2)) { // Apply constraints.
-                    U(x,y,0) = V(x,y,0)/factor;
-                    U(x,y,1) = V(x,y,1)/factor;
-                  }
-              }
-            }
-          }
-          const float d_energy = (_energy - energy)/(sw*sh*sd);
-          if (d_energy<=0 && -d_energy<_precision) break;
-          if (d_energy>0) dt*=0.5f;
-          energy = _energy;
-        }
-      }
-      return U;
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm.
-    /**
-        \param patch_image The image containing the reference patches to match with the instance image.
-        \param patch_width Width of the patch used for matching.
-        \param patch_height Height of the patch used for matching.
-        \param patch_depth Depth of the patch used for matching.
-        \param nb_iterations Number of patch-match iterations.
-        \param nb_randoms Number of randomization attempts (per pixel).
-        \param guide Image used as the initial correspondence estimate for the algorithm.
-          'guide' may have a last channel with boolean values (0=false | other=true) that
-          tells for each pixel if its correspondence vector is constrained to its initial value (constraint mask).
-        \param[out] matching_score Returned as the image of matching scores.
-        \note
-        The patch-match algorithm is described in this paper:
-        Connelly Barnes, Eli Shechtman, Adam Finkelstein, Dan B Goldman(2009),
-        PatchMatch: A Randomized Correspondence Algorithm for Structural Image Editing
-    **/
-    template<typename t1, typename t2>
-    CImg<T>& patchmatch(const CImg<T>& patch_image,
-                        const unsigned int patch_width,
-                        const unsigned int patch_height,
-                        const unsigned int patch_depth,
-                        const unsigned int nb_iterations,
-                        const unsigned int nb_randoms,
-                        const CImg<t1> &guide,
-                        CImg<t2> &matching_score) {
-      return get_patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                            nb_iterations,nb_randoms,guide,matching_score).move_to(*this);
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm \newinstance.
-    template<typename t1, typename t2>
-    CImg<intT> get_patchmatch(const CImg<T>& patch_image,
-                              const unsigned int patch_width,
-                              const unsigned int patch_height,
-                              const unsigned int patch_depth,
-                              const unsigned int nb_iterations,
-                              const unsigned int nb_randoms,
-                              const CImg<t1> &guide,
-                              CImg<t2> &matching_score) const {
-      return _patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                         nb_iterations,nb_randoms,
-                         guide,true,matching_score);
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm \overloading.
-    template<typename t>
-    CImg<T>& patchmatch(const CImg<T>& patch_image,
-                        const unsigned int patch_width,
-                        const unsigned int patch_height,
-                        const unsigned int patch_depth,
-                        const unsigned int nb_iterations,
-                        const unsigned int nb_randoms,
-                        const CImg<t> &guide) {
-      return get_patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                            nb_iterations,nb_randoms,guide).move_to(*this);
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm \overloading.
-    template<typename t>
-    CImg<intT> get_patchmatch(const CImg<T>& patch_image,
-                              const unsigned int patch_width,
-                              const unsigned int patch_height,
-                              const unsigned int patch_depth,
-                              const unsigned int nb_iterations,
-                              const unsigned int nb_randoms,
-                              const CImg<t> &guide) const {
-      return _patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                         nb_iterations,nb_randoms,
-                         guide,false,CImg<T>::empty());
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm \overloading.
-    CImg<T>& patchmatch(const CImg<T>& patch_image,
-                        const unsigned int patch_width,
-                        const unsigned int patch_height,
-                        const unsigned int patch_depth=1,
-                        const unsigned int nb_iterations=5,
-                        const unsigned int nb_randoms=5) {
-      return get_patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                            nb_iterations,nb_randoms).move_to(*this);
-    }
-
-    //! Compute correspondence map between two images, using the patch-match algorithm \overloading.
-    CImg<intT> get_patchmatch(const CImg<T>& patch_image,
-                              const unsigned int patch_width,
-                              const unsigned int patch_height,
-                              const unsigned int patch_depth=1,
-                              const unsigned int nb_iterations=5,
-                              const unsigned int nb_randoms=5) const {
-      return _patchmatch(patch_image,patch_width,patch_height,patch_depth,
-                         nb_iterations,nb_randoms,
-                         CImg<T>::const_empty(),
-                         false,CImg<T>::empty());
-    }
-
-    template<typename t1, typename t2>
-    CImg<intT> _patchmatch(const CImg<T>& patch_image,
-                           const unsigned int patch_width,
-                           const unsigned int patch_height,
-                           const unsigned int patch_depth,
-                           const unsigned int nb_iterations,
-                           const unsigned int nb_randoms,
-                           const CImg<t1> &guide,
-                           const bool is_matching_score,
-                           CImg<t2> &matching_score) const {
-      if (is_empty()) return CImg<intT>::const_empty();
-      if (patch_image._spectrum!=_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "patchmatch(): Instance image and specified patch image (%u,%u,%u,%u,%p) "
-                                    "have different spectrums.",
-                                    cimg_instance,
-                                    patch_image._width,patch_image._height,patch_image._depth,patch_image._spectrum,
-                                    patch_image._data);
-      if (patch_width>_width || patch_height>_height || patch_depth>_depth)
-        throw CImgArgumentException(_cimg_instance
-                                    "patchmatch(): Specified patch size %ux%ux%u is bigger than the dimensions "
-                                    "of the instance image.",
-                                    cimg_instance,patch_width,patch_height,patch_depth);
-      if (patch_width>patch_image._width || patch_height>patch_image._height || patch_depth>patch_image._depth)
-        throw CImgArgumentException(_cimg_instance
-                                    "patchmatch(): Specified patch size %ux%ux%u is bigger than the dimensions "
-                                    "of the patch image image (%u,%u,%u,%u,%p).",
-                                    cimg_instance,patch_width,patch_height,patch_depth,
-                                    patch_image._width,patch_image._height,patch_image._depth,patch_image._spectrum,
-                                    patch_image._data);
-      const unsigned int
-        _constraint = patch_image._depth>1?3:2,
-        constraint = guide._spectrum>_constraint?_constraint:0;
-
-      if (guide &&
-          (guide._width!=_width || guide._height!=_height || guide._depth!=_depth || guide._spectrum<_constraint))
-        throw CImgArgumentException(_cimg_instance
-                                    "patchmatch(): Specified guide (%u,%u,%u,%u,%p) has invalid dimensions "
-                                    "considering instance and patch image image (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    guide._width,guide._height,guide._depth,guide._spectrum,guide._data,
-                                    patch_image._width,patch_image._height,patch_image._depth,patch_image._spectrum,
-                                    patch_image._data);
-
-      CImg<intT> map(_width,_height,_depth,patch_image._depth>1?3:2);
-      CImg<floatT> score(_width,_height,_depth);
-      const int
-        psizew = (int)patch_width, psizew1 = psizew/2, psizew2 = psizew - psizew1 - 1,
-        psizeh = (int)patch_height, psizeh1 = psizeh/2, psizeh2 = psizeh - psizeh1 - 1,
-        psized = (int)patch_depth, psized1 = psized/2, psized2 = psized - psized1 - 1;
-
-      if (_depth>1 || patch_image._depth>1) { // 3d version.
-
-        // Initialize correspondence map.
-        if (guide) cimg_forXYZ(*this,x,y,z) { // User-defined initialization.
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()), cy2 = psizeh - cy1 - 1,
-              cz1 = z<=psized1?z:(z<depth() - psized2?psized1:psized + z - depth()), cz2 = psized - cz1 - 1,
-              u = std::min(std::max((int)guide(x,y,z,0),cx1),patch_image.width() - 1 - cx2),
-              v = std::min(std::max((int)guide(x,y,z,1),cy1),patch_image.height() - 1 - cy2),
-              w = std::min(std::max((int)guide(x,y,z,2),cz1),patch_image.depth() - 1 - cz2);
-            map(x,y,z,0) = u;
-            map(x,y,z,1) = v;
-            map(x,y,z,2) = w;
-            score(x,y,z) = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                       x - cx1,y - cy1,z - cz1,
-                                       u - cx1,v - cy1,w - cz1,cimg::type<float>::inf());
-          } else cimg_forXYZ(*this,x,y,z) { // Random initialization.
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()), cy2 = psizeh - cy1 - 1,
-              cz1 = z<=psized1?z:(z<depth() - psized2?psized1:psized + z - depth()), cz2 = psized - cz1 - 1,
-              u = (int)cimg::round(cimg::rand(cx1,patch_image.width() - 1 - cx2)),
-              v = (int)cimg::round(cimg::rand(cy1,patch_image.height() - 1 - cy2)),
-              w = (int)cimg::round(cimg::rand(cz1,patch_image.depth() - 1 - cz2));
-            map(x,y,z,0) = u;
-            map(x,y,z,1) = v;
-            map(x,y,z,2) = w;
-            score(x,y,z) = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                       x - cx1,y - cy1,z - cz1,
-                                       u - cx1,v - cy1,w - cz1,cimg::type<float>::inf());
-          }
-
-        // Start iteration loop.
-        for (unsigned int iter = 0; iter<nb_iterations; ++iter) {
-          cimg_abort_test();
-          const bool is_even = !(iter%2);
-
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>64 && iter<nb_iterations-2))
-          cimg_forXYZ(*this,X,Y,Z) {
-            const int
-              x = is_even?X:width() - 1 - X,
-              y = is_even?Y:height() - 1 - Y,
-              z = is_even?Z:depth() - 1 - Z;
-            if (score(x,y,z)<=1e-5 || (constraint && guide(x,y,z,constraint)!=0)) continue;
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()), cy2 = psizeh - cy1 - 1,
-              cz1 = z<=psized1?z:(z<depth() - psized2?psized1:psized + z - depth()), cz2 = psized - cz1 - 1,
-              xp = x - cx1,
-              yp = y - cy1,
-              zp = z - cz1;
-
-            // Propagation.
-            if (is_even) {
-              if (x>0) { // Compare with left neighbor.
-                const int u = map(x - 1,y,z,0), v = map(x - 1,y,z,1), w = map(x - 1,y,z,2);
-                if (u>=cx1 - 1 && u<patch_image.width() - 1 - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2 &&
-                    w>=cz1 && w<patch_image.depth() - cz2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u + 1 - cx1,v - cy1,w - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u + 1; map(x,y,z,1) = v; map(x,y,z,2) = w; }
-                }
-              }
-              if (y>0) { // Compare with up neighbor.
-                const int u = map(x,y - 1,z,0), v = map(x,y - 1,z,1), w = map(x,y - 1,z,2);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 - 1 && v<patch_image.height() - 1 - cy2 &&
-                    w>=cz1 && w<patch_image.depth() - cx2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u - cx1,v + 1 - cy1,w - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u; map(x,y,z,1) = v + 1; map(x,y,z,2) = w; }
-                }
-              }
-              if (z>0) { // Compare with backward neighbor.
-                const int u = map(x,y,z - 1,0), v = map(x,y,z - 1,1), w = map(x,y,z - 1,2);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2 &&
-                    w>=cz1 - 1 && w<patch_image.depth() - 1 - cz2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u - cx1,v - cy1,w + 1 - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u; map(x,y,z,1) = v; map(x,y,z,2) = w + 1; }
-                }
-              }
-            } else {
-              if (x<width() - 1) { // Compare with right neighbor.
-                const int u = map(x + 1,y,z,0), v = map(x + 1,y,z,1), w = map(x + 1,y,z,2);
-                if (u>=cx1 + 1 && u<patch_image.width() + 1 - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2 &&
-                    w>=cz1 && w<patch_image.depth() - cz2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u - 1 - cx1,v - cy1,w - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u - 1; map(x,y,z,1) = v; map(x,y,z,2) = w; }
-                }
-              }
-              if (y<height() - 1) { // Compare with bottom neighbor.
-                const int u = map(x,y + 1,z,0), v = map(x,y + 1,z,1), w = map(x,y + 1,z,2);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 + 1 && v<patch_image.height() + 1 - cy2 &&
-                    w>=cz1 && w<patch_image.depth() - cz2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u - cx1,v - 1 - cy1,w - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u; map(x,y,z,1) = v - 1; map(x,y,z,2) = w; }
-                }
-              }
-              if (z<depth() - 1) { // Compare with forward neighbor.
-                const int u = map(x,y,z + 1,0), v = map(x,y,z + 1,1), w = map(x,y,z + 1,2);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2 &&
-                    w>=cz1 + 1 && w<patch_image.depth() + 1 - cz2) {
-                  const float
-                    current_score = score(x,y,z),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                    xp,yp,zp,u - cx1,v - cy1,w - 1 - cz1,current_score);
-                  if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = u; map(x,y,z,1) = v; map(x,y,z,2) = w - 1; }
-                }
-              }
-            }
-
-            // Randomization.
-            const int u = map(x,y,z,0), v = map(x,y,z,1), w = map(x,y,z,2);
-            float dw = (float)patch_image.width(), dh = (float)patch_image.height(), dd = (float)patch_image.depth();
-            for (unsigned int i = 0; i<nb_randoms; ++i) {
-              const int
-                ui = (int)cimg::round(cimg::rand(std::max((float)cx1,u - dw),
-                                                 std::min(patch_image.width() - 1.0f - cx2,u + dw))),
-                vi = (int)cimg::round(cimg::rand(std::max((float)cy1,v - dh),
-                                                 std::min(patch_image.height() - 1.0f - cy2,v + dh))),
-                wi = (int)cimg::round(cimg::rand(std::max((float)cz1,w - dd),
-                                                 std::min(patch_image.depth() - 1.0f - cz2,w + dd)));
-              if (ui!=u || vi!=v || wi!=w) {
-                const float
-                  current_score = score(x,y,z),
-                  D = _patchmatch(*this,patch_image,patch_width,patch_height,patch_depth,
-                                  xp,yp,zp,ui - cx1,vi - cy1,wi - cz1,current_score);
-                if (D<current_score) { score(x,y,z) = D; map(x,y,z,0) = ui; map(x,y,z,1) = vi; map(x,y,z,2) = wi; }
-                dw = std::max(5.0f,dw*0.5f); dh = std::max(5.0f,dh*0.5f); dd = std::max(5.0f,dd*0.5f);
-              }
-            }
-          }
-        }
-
-      } else { // 2d version.
-
-        // Initialize correspondence map.
-        if (guide) cimg_forXY(*this,x,y) { // Random initialization.
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()) , cy2 = psizeh - cy1 - 1,
-              u = std::min(std::max((int)guide(x,y,0),cx1),patch_image.width() - 1 - cx2),
-              v = std::min(std::max((int)guide(x,y,1),cy1),patch_image.height() - 1 - cy2);
-            map(x,y,0) = u;
-            map(x,y,1) = v;
-            score(x,y) = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                     x - cx1,y - cy1,u - cx1,v - cy1,cimg::type<float>::inf());
-          } else cimg_forXY(*this,x,y) { // Random initialization.
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()) , cy2 = psizeh - cy1 - 1,
-              u = (int)cimg::round(cimg::rand(cx1,patch_image.width() - 1 - cx2)),
-              v = (int)cimg::round(cimg::rand(cy1,patch_image.height() - 1 - cy2));
-            map(x,y,0) = u;
-            map(x,y,1) = v;
-            score(x,y) = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                     x - cx1,y - cy1,u - cx1,v - cy1,cimg::type<float>::inf());
-          }
-
-        // Start iteration loop.
-        for (unsigned int iter = 0; iter<nb_iterations; ++iter) {
-          const bool is_even = !(iter%2);
-
-          cimg_pragma_openmp(parallel for cimg_openmp_if(_width>64 && iter<nb_iterations-2))
-          cimg_forXY(*this,X,Y) {
-            const int
-              x = is_even?X:width() - 1 - X,
-              y = is_even?Y:height() - 1 - Y;
-            if (score(x,y)<=1e-5 || (constraint && guide(x,y,constraint)!=0)) continue;
-            const int
-              cx1 = x<=psizew1?x:(x<width() - psizew2?psizew1:psizew + x - width()), cx2 = psizew - cx1 - 1,
-              cy1 = y<=psizeh1?y:(y<height() - psizeh2?psizeh1:psizeh + y - height()) , cy2 = psizeh - cy1 - 1,
-              xp = x - cx1,
-              yp = y - cy1;
-
-            // Propagation.
-            if (is_even) {
-              if (x>0) { // Compare with left neighbor.
-                const int u = map(x - 1,y,0), v = map(x - 1,y,1);
-                if (u>=cx1 - 1 && u<patch_image.width() - 1 - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2) {
-                  const float
-                    current_score = score(x,y),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                    xp,yp,u + 1 - cx1,v - cy1,current_score);
-                  if (D<current_score) { score(x,y) = D; map(x,y,0) = u + 1; map(x,y,1) = v; }
-                }
-              }
-              if (y>0) { // Compare with up neighbor.
-                const int u = map(x,y - 1,0), v = map(x,y - 1,1);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 - 1 && v<patch_image.height() - 1 - cy2) {
-                  const float
-                    current_score = score(x,y),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                    xp,yp,u - cx1,v + 1 - cy1,current_score);
-                  if (D<current_score) { score(x,y) = D; map(x,y,0) = u; map(x,y,1) = v + 1; }
-                }
-              }
-            } else {
-              if (x<width() - 1) { // Compare with right neighbor.
-                const int u = map(x + 1,y,0), v = map(x + 1,y,1);
-                if (u>=cx1 + 1 && u<patch_image.width() + 1 - cx2 &&
-                    v>=cy1 && v<patch_image.height() - cy2) {
-                  const float
-                    current_score = score(x,y),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                    xp,yp,u - 1 - cx1,v - cy1,current_score);
-                  if (D<current_score) { score(x,y) = D; map(x,y,0) = u - 1; map(x,y,1) = v; }
-                }
-              }
-              if (y<height() - 1) { // Compare with bottom neighbor.
-                const int u = map(x,y + 1,0), v = map(x,y + 1,1);
-                if (u>=cx1 && u<patch_image.width() - cx2 &&
-                    v>=cy1 + 1 && v<patch_image.height() + 1 - cy2) {
-                  const float
-                    current_score = score(x,y),
-                    D = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                    xp,yp,u - cx1,v - 1 - cy1,current_score);
-                  if (D<current_score) { score(x,y) = D; map(x,y,0) = u; map(x,y,1) = v - 1; }
-                }
-              }
-            }
-
-            // Randomization.
-            const int u = map(x,y,0), v = map(x,y,1);
-            float dw = (float)patch_image.width(), dh = (float)patch_image.height();
-            for (unsigned int i = 0; i<nb_randoms; ++i) {
-              const int
-                ui = (int)cimg::round(cimg::rand(std::max((float)cx1,u - dw),
-                                                 std::min(patch_image.width() - 1.0f - cx2,u + dw))),
-                vi = (int)cimg::round(cimg::rand(std::max((float)cy1,v - dh),
-                                                 std::min(patch_image.height() - 1.0f - cy2,v + dh)));
-              if (ui!=u || vi!=v) {
-                const float
-                  current_score = score(x,y),
-                  D = _patchmatch(*this,patch_image,patch_width,patch_height,
-                                  xp,yp,ui - cx1,vi - cy1,current_score);
-                if (D<current_score) { score(x,y) = D; map(x,y,0) = ui; map(x,y,1) = vi; }
-                dw = std::max(5.0f,dw*0.5f); dh = std::max(5.0f,dh*0.5f);
-              }
-            }
-          }
-        }
-      }
-      if (is_matching_score) score.move_to(matching_score);
-      return map;
-    }
-
-    // Compute SSD between two patches in different images.
-    static float _patchmatch(const CImg<T>& img1, const CImg<T>& img2,
-                             const unsigned int psizew, const unsigned int psizeh,
-                             const int x1, const int y1,
-                             const int x2, const int y2,
-                             const float max_ssd) { // 2d version.
-      const T *p1 = img1.data(x1,y1), *p2 = img2.data(x2,y2);
-      const ulongT
-        offx1 = (ulongT)img1._width - psizew,
-        offx2 = (ulongT)img2._width - psizew,
-        offy1 = (ulongT)img1._width*img1._height - psizeh*img1._width,
-        offy2 = (ulongT)img2._width*img2._height - psizeh*img2._width;
-      float ssd = 0;
-      cimg_forC(img1,c) {
-        for (unsigned int j = 0; j<psizeh; ++j) {
-          for (unsigned int i = 0; i<psizew; ++i)
-            ssd += cimg::sqr(*(p1++) - *(p2++));
-          if (ssd>max_ssd) return max_ssd;
-          p1+=offx1; p2+=offx2;
-        }
-        p1+=offy1; p2+=offy2;
-      }
-      return ssd;
-    }
-
-    static float _patchmatch(const CImg<T>& img1, const CImg<T>& img2,
-                             const unsigned int psizew, const unsigned int psizeh, const unsigned int psized,
-                             const int x1, const int y1, const int z1,
-                             const int x2, const int y2, const int z2,
-                             const float max_ssd) { // 3d version.
-      const T *p1 = img1.data(x1,y1,z1), *p2 = img2.data(x2,y2,z2);
-      const ulongT
-        offx1 = (ulongT)img1._width - psizew,
-        offx2 = (ulongT)img2._width - psizew,
-        offy1 = (ulongT)img1._width*img1._height - psizeh*img1._width - psizew,
-        offy2 = (ulongT)img2._width*img2._height - psizeh*img2._width - psizew,
-        offz1 = (ulongT)img1._width*img1._height*img1._depth - psized*img1._width*img1._height -
-        psizeh*img1._width - psizew,
-        offz2 = (ulongT)img2._width*img2._height*img2._depth - psized*img2._width*img2._height -
-        psizeh*img2._width - psizew;
-      float ssd = 0;
-      cimg_forC(img1,c) {
-        for (unsigned int k = 0; k<psized; ++k) {
-          for (unsigned int j = 0; j<psizeh; ++j) {
-            for (unsigned int i = 0; i<psizew; ++i)
-              ssd += cimg::sqr(*(p1++) - *(p2++));
-            if (ssd>max_ssd) return max_ssd;
-            p1+=offx1; p2+=offx2;
-          }
-          p1+=offy1; p2+=offy2;
-        }
-        p1+=offz1; p2+=offz2;
-      }
-      return ssd;
-    }
-
-    //! Compute Euclidean distance function to a specified value.
-    /**
-        \param value Reference value.
-        \param metric Type of metric. Can be <tt>{ 0=Chebyshev | 1=Manhattan | 2=Euclidean | 3=Squared-euclidean }</tt>.
-        \note
-        The distance transform implementation has been submitted by A. Meijster, and implements
-        the article 'W.H. Hesselink, A. Meijster, J.B.T.M. Roerdink,
-                     "A general algorithm for computing distance transforms in linear time.",
-                     In: Mathematical Morphology and its Applications to Image and Signal Processing,
-                     J. Goutsias, L. Vincent, and D.S. Bloomberg (eds.), Kluwer, 2000, pp. 331-340.'
-         The submitted code has then been modified to fit CImg coding style and constraints.
-    **/
-    CImg<T>& distance(const T& value, const unsigned int metric=2) {
-      if (is_empty()) return *this;
-      if (cimg::type<Tint>::string()!=cimg::type<T>::string()) // For datatype < int.
-        return CImg<Tint>(*this,false).distance((Tint)value,metric).
-          cut((Tint)cimg::type<T>::min(),(Tint)cimg::type<T>::max()).move_to(*this);
-      bool is_value = false;
-      cimg_for(*this,ptr,T) *ptr = *ptr==value?is_value=true,(T)0:(T)std::max(0,99999999); // (avoid VC++ warning)
-      if (!is_value) return fill(cimg::type<T>::max());
-      switch (metric) {
-      case 0 : return _distance_core(_distance_sep_cdt,_distance_dist_cdt);          // Chebyshev.
-      case 1 : return _distance_core(_distance_sep_mdt,_distance_dist_mdt);          // Manhattan.
-      case 3 : return _distance_core(_distance_sep_edt,_distance_dist_edt);          // Squared Euclidean.
-      default : return _distance_core(_distance_sep_edt,_distance_dist_edt).sqrt();  // Euclidean.
-      }
-      return *this;
-    }
-
-    //! Compute distance to a specified value \newinstance.
-    CImg<Tfloat> get_distance(const T& value, const unsigned int metric=2) const {
-      return CImg<Tfloat>(*this,false).distance((Tfloat)value,metric);
-    }
-
-    static longT _distance_sep_edt(const longT i, const longT u, const longT *const g) {
-      return (u*u - i*i + g[u] - g[i])/(2*(u - i));
-    }
-
-    static longT _distance_dist_edt(const longT x, const longT i, const longT *const g) {
-      return (x - i)*(x - i) + g[i];
-    }
-
-    static longT _distance_sep_mdt(const longT i, const longT u, const longT *const g) {
-      return (u - i<=g[u] - g[i]?999999999:(g[u] - g[i] + u + i)/2);
-    }
-
-    static longT _distance_dist_mdt(const longT x, const longT i, const longT *const g) {
-      return (x<i?i - x:x - i) + g[i];
-    }
-
-    static longT _distance_sep_cdt(const longT i, const longT u, const longT *const g) {
-      const longT h = (i + u)/2;
-      if (g[i]<=g[u]) { return h<i + g[u]?i + g[u]:h; }
-      return h<u - g[i]?h:u - g[i];
-    }
-
-    static longT _distance_dist_cdt(const longT x, const longT i, const longT *const g) {
-      const longT d = x<i?i - x:x - i;
-      return d<g[i]?g[i]:d;
-    }
-
-    static void _distance_scan(const unsigned int len,
-                               const longT *const g,
-                               longT (*const sep)(const longT, const longT, const longT *const),
-                               longT (*const f)(const longT, const longT, const longT *const),
-                               longT *const s,
-                               longT *const t,
-                               longT *const dt) {
-      longT q = s[0] = t[0] = 0;
-      for (int u = 1; u<(int)len; ++u) { // Forward scan.
-        while ((q>=0) && f(t[q],s[q],g)>f(t[q],u,g)) { --q; }
-        if (q<0) { q = 0; s[0] = u; }
-        else { const longT w = 1 + sep(s[q], u, g); if (w<(longT)len) { ++q; s[q] = u; t[q] = w; }}
-      }
-      for (int u = (int)len - 1; u>=0; --u) { dt[u] = f(u,s[q],g); if (u==t[q]) --q; } // Backward scan.
-    }
-
-    CImg<T>& _distance_core(longT (*const sep)(const longT, const longT, const longT *const),
-                            longT (*const f)(const longT, const longT, const longT *const)) {
- // Check for g++ 4.9.X, as OpenMP seems to crash for this particular function. I have no clues why.
-#define cimg_is_gcc49x (__GNUC__==4 && __GNUC_MINOR__==9)
-
-      const ulongT wh = (ulongT)_width*_height;
-#if defined(cimg_use_openmp) && !cimg_is_gcc49x
-      cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-#endif
-      cimg_forC(*this,c) {
-        CImg<longT> g(_width), dt(_width), s(_width), t(_width);
-        CImg<T> img = get_shared_channel(c);
-#if defined(cimg_use_openmp) && !cimg_is_gcc49x
-        cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_width>=512 && _height*_depth>=16)
-                           firstprivate(g,dt,s,t))
-#endif
-        cimg_forYZ(*this,y,z) { // Over X-direction.
-          cimg_forX(*this,x) g[x] = (longT)img(x,y,z,0,wh);
-          _distance_scan(_width,g,sep,f,s,t,dt);
-          cimg_forX(*this,x) img(x,y,z,0,wh) = (T)dt[x];
-        }
-        if (_height>1) {
-          g.assign(_height); dt.assign(_height); s.assign(_height); t.assign(_height);
-#if defined(cimg_use_openmp) && !cimg_is_gcc49x
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_height>=512 && _width*_depth>=16)
-                             firstprivate(g,dt,s,t))
-#endif
-          cimg_forXZ(*this,x,z) { // Over Y-direction.
-            cimg_forY(*this,y) g[y] = (longT)img(x,y,z,0,wh);
-            _distance_scan(_height,g,sep,f,s,t,dt);
-            cimg_forY(*this,y) img(x,y,z,0,wh) = (T)dt[y];
-          }
-        }
-        if (_depth>1) {
-          g.assign(_depth); dt.assign(_depth); s.assign(_depth); t.assign(_depth);
-#if defined(cimg_use_openmp) && !cimg_is_gcc49x
-          cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if(_depth>=512 && _width*_height>=16)
-                             firstprivate(g,dt,s,t))
-#endif
-          cimg_forXY(*this,x,y) { // Over Z-direction.
-            cimg_forZ(*this,z) g[z] = (longT)img(x,y,z,0,wh);
-            _distance_scan(_depth,g,sep,f,s,t,dt);
-            cimg_forZ(*this,z) img(x,y,z,0,wh) = (T)dt[z];
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Compute chamfer distance to a specified value, with a custom metric.
-    /**
-       \param value Reference value.
-       \param metric_mask Metric mask.
-       \note The algorithm code has been initially proposed by A. Meijster, and modified by D. Tschumperlé.
-    **/
-    template<typename t>
-    CImg<T>& distance(const T& value, const CImg<t>& metric_mask) {
-      if (is_empty()) return *this;
-      bool is_value = false;
-      cimg_for(*this,ptr,T) *ptr = *ptr==value?is_value=true,0:(T)999999999;
-      if (!is_value) return fill(cimg::type<T>::max());
-      const ulongT wh = (ulongT)_width*_height;
-      cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2))
-      cimg_forC(*this,c) {
-        CImg<T> img = get_shared_channel(c);
-        cimg_pragma_openmp(parallel for collapse(3) cimg_openmp_if(_width*_height*_depth>=1024))
-        cimg_forXYZ(metric_mask,dx,dy,dz) {
-          const t weight = metric_mask(dx,dy,dz);
-          if (weight) {
-            for (int z = dz, nz = 0; z<depth(); ++z,++nz) { // Forward scan.
-              for (int y = dy , ny = 0; y<height(); ++y,++ny) {
-                for (int x = dx, nx = 0; x<width(); ++x,++nx) {
-                  const T dd = img(nx,ny,nz,0,wh) + weight;
-                  if (dd<img(x,y,z,0,wh)) img(x,y,z,0,wh) = dd;
-                }
-              }
-            }
-            for (int z = depth() - 1 - dz, nz = depth() - 1; z>=0; --z,--nz) { // Backward scan.
-              for (int y = height() - 1 - dy, ny = height() - 1; y>=0; --y,--ny) {
-                for (int x = width() - 1 - dx, nx = width() - 1; x>=0; --x,--nx) {
-                  const T dd = img(nx,ny,nz,0,wh) + weight;
-                  if (dd<img(x,y,z,0,wh)) img(x,y,z,0,wh) = dd;
-                }
-              }
-            }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Compute chamfer distance to a specified value, with a custom metric \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_distance(const T& value, const CImg<t>& metric_mask) const {
-      return CImg<Tfloat>(*this,false).distance(value,metric_mask);
-    }
-
-    //! Compute distance to a specified value, according to a custom metric (use dijkstra algorithm).
-    /**
-       \param value Reference value.
-       \param metric Field of distance potentials.
-       \param is_high_connectivity Tells if the algorithm uses low or high connectivity.
-     **/
-    template<typename t, typename to>
-    CImg<T>& distance_dijkstra(const T& value, const CImg<t>& metric, const bool is_high_connectivity,
-                               CImg<to>& return_path) {
-      return get_distance_dijkstra(value,metric,is_high_connectivity,return_path).move_to(*this);
-    }
-
-    //! Compute distance map to a specified value, according to a custom metric (use dijkstra algorithm) \newinstance.
-    template<typename t, typename to>
-    CImg<typename cimg::superset<t,long>::type>
-    get_distance_dijkstra(const T& value, const CImg<t>& metric, const bool is_high_connectivity,
-                          CImg<to>& return_path) const {
-      if (is_empty()) return return_path.assign();
-      if (!is_sameXYZ(metric))
-        throw CImgArgumentException(_cimg_instance
-                                    "distance_dijkstra(): image instance and metric map (%u,%u,%u,%u) "
-                                    "have incompatible dimensions.",
-                                    cimg_instance,
-                                    metric._width,metric._height,metric._depth,metric._spectrum);
-      typedef typename cimg::superset<t,long>::type td;  // Type used for computing cumulative distances.
-      CImg<td> result(_width,_height,_depth,_spectrum), Q;
-      CImg<boolT> is_queued(_width,_height,_depth,1);
-      if (return_path) return_path.assign(_width,_height,_depth,_spectrum);
-
-      cimg_forC(*this,c) {
-        const CImg<T> img = get_shared_channel(c);
-        const CImg<t> met = metric.get_shared_channel(c%metric._spectrum);
-        CImg<td> res = result.get_shared_channel(c);
-        CImg<to> path = return_path?return_path.get_shared_channel(c):CImg<to>();
-        unsigned int sizeQ = 0;
-
-        // Detect initial seeds.
-        is_queued.fill(0);
-        cimg_forXYZ(img,x,y,z) if (img(x,y,z)==value) {
-          Q._priority_queue_insert(is_queued,sizeQ,0,x,y,z);
-          res(x,y,z) = 0;
-          if (path) path(x,y,z) = (to)0;
-        }
-
-        // Start distance propagation.
-        while (sizeQ) {
-
-          // Get and remove point with minimal potential from the queue.
-          const int x = (int)Q(0,1), y = (int)Q(0,2), z = (int)Q(0,3);
-          const td P = (td)-Q(0,0);
-          Q._priority_queue_remove(sizeQ);
-
-          // Update neighbors.
-          td npot = 0;
-          if (x - 1>=0 && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x - 1,y,z) + P),x - 1,y,z)) {
-            res(x - 1,y,z) = npot; if (path) path(x - 1,y,z) = (to)2;
-          }
-          if (x + 1<width() && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x + 1,y,z) + P),x + 1,y,z)) {
-            res(x + 1,y,z) = npot; if (path) path(x + 1,y,z) = (to)1;
-          }
-          if (y - 1>=0 && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x,y - 1,z) + P),x,y - 1,z)) {
-            res(x,y - 1,z) = npot; if (path) path(x,y - 1,z) = (to)8;
-          }
-          if (y + 1<height() && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x,y + 1,z) + P),x,y + 1,z)) {
-            res(x,y + 1,z) = npot; if (path) path(x,y + 1,z) = (to)4;
-          }
-          if (z - 1>=0 && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x,y,z - 1) + P),x,y,z - 1)) {
-            res(x,y,z - 1) = npot; if (path) path(x,y,z - 1) = (to)32;
-          }
-          if (z + 1<depth() && Q._priority_queue_insert(is_queued,sizeQ,-(npot=met(x,y,z + 1) + P),x,y,z + 1)) {
-            res(x,y,z + 1) = npot; if (path) path(x,y,z + 1) = (to)16;
-          }
-
-          if (is_high_connectivity) {
-            const float sqrt2 = std::sqrt(2.0f), sqrt3 = std::sqrt(3.0f);
-
-            // Diagonal neighbors on slice z.
-            if (x - 1>=0 && y - 1>=0 &&
-                Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x - 1,y - 1,z) + P)),x - 1,y - 1,z)) {
-              res(x - 1,y - 1,z) = npot; if (path) path(x - 1,y - 1,z) = (to)10;
-            }
-            if (x + 1<width() && y - 1>=0 &&
-                Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x + 1,y - 1,z) + P)),x + 1,y - 1,z)) {
-              res(x + 1,y - 1,z) = npot; if (path) path(x + 1,y - 1,z) = (to)9;
-            }
-            if (x - 1>=0 && y + 1<height() &&
-                Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x - 1,y + 1,z) + P)),x - 1,y + 1,z)) {
-              res(x - 1,y + 1,z) = npot; if (path) path(x - 1,y + 1,z) = (to)6;
-            }
-            if (x + 1<width() && y + 1<height() &&
-                Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x + 1,y + 1,z) + P)),x + 1,y + 1,z)) {
-              res(x + 1,y + 1,z) = npot; if (path) path(x + 1,y + 1,z) = (to)5;
-            }
-
-            if (z - 1>=0) { // Diagonal neighbors on slice z - 1.
-              if (x - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x - 1,y,z - 1) + P)),x - 1,y,z - 1)) {
-                res(x - 1,y,z - 1) = npot; if (path) path(x - 1,y,z - 1) = (to)34;
-              }
-              if (x + 1<width() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x + 1,y,z - 1) + P)),x + 1,y,z - 1)) {
-                res(x + 1,y,z - 1) = npot; if (path) path(x + 1,y,z - 1) = (to)33;
-              }
-              if (y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x,y - 1,z - 1) + P)),x,y - 1,z - 1)) {
-                res(x,y - 1,z - 1) = npot; if (path) path(x,y - 1,z - 1) = (to)40;
-              }
-              if (y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x,y + 1,z - 1) + P)),x,y + 1,z - 1)) {
-                res(x,y + 1,z - 1) = npot; if (path) path(x,y + 1,z - 1) = (to)36;
-              }
-              if (x - 1>=0 && y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x - 1,y - 1,z - 1) + P)),
-                                           x - 1,y - 1,z - 1)) {
-                res(x - 1,y - 1,z - 1) = npot; if (path) path(x - 1,y - 1,z - 1) = (to)42;
-              }
-              if (x + 1<width() && y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x + 1,y - 1,z - 1) + P)),
-                                           x + 1,y - 1,z - 1)) {
-                res(x + 1,y - 1,z - 1) = npot; if (path) path(x + 1,y - 1,z - 1) = (to)41;
-              }
-              if (x - 1>=0 && y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x - 1,y + 1,z - 1) + P)),
-                                           x - 1,y + 1,z - 1)) {
-                res(x - 1,y + 1,z - 1) = npot; if (path) path(x - 1,y + 1,z - 1) = (to)38;
-              }
-              if (x + 1<width() && y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x + 1,y + 1,z - 1) + P)),
-                                           x + 1,y + 1,z - 1)) {
-                res(x + 1,y + 1,z - 1) = npot; if (path) path(x + 1,y + 1,z - 1) = (to)37;
-              }
-            }
-
-            if (z + 1<depth()) { // Diagonal neighbors on slice z + 1.
-              if (x - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x - 1,y,z + 1) + P)),x - 1,y,z + 1)) {
-                res(x - 1,y,z + 1) = npot; if (path) path(x - 1,y,z + 1) = (to)18;
-              }
-              if (x + 1<width() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x + 1,y,z + 1) + P)),x + 1,y,z + 1)) {
-                res(x + 1,y,z + 1) = npot; if (path) path(x + 1,y,z + 1) = (to)17;
-              }
-              if (y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x,y - 1,z + 1) + P)),x,y - 1,z + 1)) {
-                res(x,y - 1,z + 1) = npot; if (path) path(x,y - 1,z + 1) = (to)24;
-              }
-              if (y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt2*met(x,y + 1,z + 1) + P)),x,y + 1,z + 1)) {
-                res(x,y + 1,z + 1) = npot; if (path) path(x,y + 1,z + 1) = (to)20;
-              }
-              if (x - 1>=0 && y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x - 1,y - 1,z + 1) + P)),
-                                           x - 1,y - 1,z + 1)) {
-                res(x - 1,y - 1,z + 1) = npot; if (path) path(x - 1,y - 1,z + 1) = (to)26;
-              }
-              if (x + 1<width() && y - 1>=0 &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x + 1,y - 1,z + 1) + P)),
-                                           x + 1,y - 1,z + 1)) {
-                res(x + 1,y - 1,z + 1) = npot; if (path) path(x + 1,y - 1,z + 1) = (to)25;
-              }
-              if (x - 1>=0 && y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x - 1,y + 1,z + 1) + P)),
-                                           x - 1,y + 1,z + 1)) {
-                res(x - 1,y + 1,z + 1) = npot; if (path) path(x - 1,y + 1,z + 1) = (to)22;
-              }
-              if (x + 1<width() && y + 1<height() &&
-                  Q._priority_queue_insert(is_queued,sizeQ,-(npot=(td)(sqrt3*met(x + 1,y + 1,z + 1) + P)),
-                                           x + 1,y + 1,z + 1)) {
-                res(x + 1,y + 1,z + 1) = npot; if (path) path(x + 1,y + 1,z + 1) = (to)21;
-              }
-            }
-          }
-        }
-      }
-      return result;
-    }
-
-    //! Compute distance map to a specified value, according to a custom metric (use dijkstra algorithm). \overloading.
-    template<typename t>
-    CImg<T>& distance_dijkstra(const T& value, const CImg<t>& metric,
-                               const bool is_high_connectivity=false) {
-      return get_distance_dijkstra(value,metric,is_high_connectivity).move_to(*this);
-    }
-
-    //! Compute distance map to a specified value, according to a custom metric (use dijkstra algorithm). \newinstance.
-    template<typename t>
-    CImg<Tfloat> get_distance_dijkstra(const T& value, const CImg<t>& metric,
-                                       const bool is_high_connectivity=false) const {
-      CImg<T> return_path;
-      return get_distance_dijkstra(value,metric,is_high_connectivity,return_path);
-    }
-
-    //! Compute distance map to one source point, according to a custom metric (use fast marching algorithm).
-    /**
-       \param value Reference value.
-       \param metric Field of distance potentials.
-     **/
-    template<typename t>
-    CImg<T>& distance_eikonal(const T& value, const CImg<t>& metric) {
-      return get_distance_eikonal(value,metric).move_to(*this);
-    }
-
-    //! Compute distance map to one source point, according to a custom metric (use fast marching algorithm).
-    template<typename t>
-    CImg<Tfloat> get_distance_eikonal(const T& value, const CImg<t>& metric) const {
-      if (is_empty()) return *this;
-      if (!is_sameXYZ(metric))
-        throw CImgArgumentException(_cimg_instance
-                                    "distance_eikonal(): image instance and metric map (%u,%u,%u,%u) have "
-                                    "incompatible dimensions.",
-                                    cimg_instance,
-                                    metric._width,metric._height,metric._depth,metric._spectrum);
-      CImg<Tfloat> result(_width,_height,_depth,_spectrum,cimg::type<Tfloat>::max()), Q;
-      CImg<charT> state(_width,_height,_depth); // -1=far away, 0=narrow, 1=frozen.
-
-      cimg_pragma_openmp(parallel for cimg_openmp_if(_spectrum>=2) firstprivate(Q,state))
-      cimg_forC(*this,c) {
-        const CImg<T> img = get_shared_channel(c);
-        const CImg<t> met = metric.get_shared_channel(c%metric._spectrum);
-        CImg<Tfloat> res = result.get_shared_channel(c);
-        unsigned int sizeQ = 0;
-        state.fill(-1);
-
-        // Detect initial seeds.
-        Tfloat *ptr1 = res._data; char *ptr2 = state._data;
-        cimg_for(img,ptr0,T) { if (*ptr0==value) { *ptr1 = 0; *ptr2 = 1; } ++ptr1; ++ptr2; }
-
-        // Initialize seeds neighbors.
-        ptr2 = state._data;
-        cimg_forXYZ(img,x,y,z) if (*(ptr2++)==1) {
-          if (x - 1>=0 && state(x - 1,y,z)==-1) {
-            const Tfloat dist = res(x - 1,y,z) = __distance_eikonal(res,met(x - 1,y,z),x - 1,y,z);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x - 1,y,z);
-          }
-          if (x + 1<width() && state(x + 1,y,z)==-1) {
-            const Tfloat dist = res(x + 1,y,z) = __distance_eikonal(res,met(x + 1,y,z),x + 1,y,z);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x + 1,y,z);
-          }
-          if (y - 1>=0 && state(x,y - 1,z)==-1) {
-            const Tfloat dist = res(x,y - 1,z) = __distance_eikonal(res,met(x,y - 1,z),x,y - 1,z);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y - 1,z);
-          }
-          if (y + 1<height() && state(x,y + 1,z)==-1) {
-            const Tfloat dist = res(x,y + 1,z) = __distance_eikonal(res,met(x,y + 1,z),x,y + 1,z);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y + 1,z);
-          }
-          if (z - 1>=0 && state(x,y,z - 1)==-1) {
-            const Tfloat dist = res(x,y,z - 1) = __distance_eikonal(res,met(x,y,z - 1),x,y,z - 1);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y,z - 1);
-          }
-          if (z + 1<depth() && state(x,y,z + 1)==-1) {
-            const Tfloat dist = res(x,y,z + 1) = __distance_eikonal(res,met(x,y,z + 1),x,y,z + 1);
-            Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y,z + 1);
-          }
-        }
-
-        // Propagate front.
-        while (sizeQ) {
-          int x = -1, y = -1, z = -1;
-          while (sizeQ && x<0) {
-            x = (int)Q(0,1); y = (int)Q(0,2); z = (int)Q(0,3);
-            Q._priority_queue_remove(sizeQ);
-            if (state(x,y,z)==1) x = -1; else state(x,y,z) = 1;
-          }
-          if (x>=0) {
-            if (x - 1>=0 && state(x - 1,y,z)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x - 1,y,z),x - 1,y,z);
-              if (dist<res(x - 1,y,z)) {
-                res(x - 1,y,z) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x - 1,y,z);
-              }
-            }
-            if (x + 1<width() && state(x + 1,y,z)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x + 1,y,z),x + 1,y,z);
-              if (dist<res(x + 1,y,z)) {
-                res(x + 1,y,z) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x + 1,y,z);
-              }
-            }
-            if (y - 1>=0 && state(x,y - 1,z)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x,y - 1,z),x,y - 1,z);
-              if (dist<res(x,y - 1,z)) {
-                res(x,y - 1,z) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y - 1,z);
-              }
-            }
-            if (y + 1<height() && state(x,y + 1,z)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x,y + 1,z),x,y + 1,z);
-              if (dist<res(x,y + 1,z)) {
-                res(x,y + 1,z) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y + 1,z);
-              }
-            }
-            if (z - 1>=0 && state(x,y,z - 1)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x,y,z - 1),x,y,z - 1);
-              if (dist<res(x,y,z - 1)) {
-                res(x,y,z - 1) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y,z - 1);
-              }
-            }
-            if (z + 1<depth() && state(x,y,z + 1)!=1) {
-              const Tfloat dist = __distance_eikonal(res,met(x,y,z + 1),x,y,z + 1);
-              if (dist<res(x,y,z + 1)) {
-                res(x,y,z + 1) = dist; Q._eik_priority_queue_insert(state,sizeQ,-dist,x,y,z + 1);
-              }
-            }
-          }
-        }
-      }
-      return result;
-    }
-
-    // Locally solve eikonal equation.
-    Tfloat __distance_eikonal(const CImg<Tfloat>& res, const Tfloat P,
-                              const int x=0, const int y=0, const int z=0) const {
-      const Tfloat M = (Tfloat)cimg::type<T>::max();
-      T T1 = (T)std::min(x - 1>=0?res(x - 1,y,z):M,x + 1<width()?res(x + 1,y,z):M);
-      Tfloat root = 0;
-      if (_depth>1) { // 3d.
-        T
-          T2 = (T)std::min(y - 1>=0?res(x,y - 1,z):M,y + 1<height()?res(x,y + 1,z):M),
-          T3 = (T)std::min(z - 1>=0?res(x,y,z - 1):M,z + 1<depth()?res(x,y,z + 1):M);
-        if (T1>T2) cimg::swap(T1,T2);
-        if (T2>T3) cimg::swap(T2,T3);
-        if (T1>T2) cimg::swap(T1,T2);
-        if (P<=0) return (Tfloat)T1;
-        if (T3<M && ___distance_eikonal(3,-2*(T1 + T2 + T3),T1*T1 + T2*T2 + T3*T3 - P*P,root))
-          return std::max((Tfloat)T3,root);
-        if (T2<M && ___distance_eikonal(2,-2*(T1 + T2),T1*T1 + T2*T2 - P*P,root))
-          return std::max((Tfloat)T2,root);
-        return P + T1;
-      } else if (_height>1) { // 2d.
-        T T2 = (T)std::min(y - 1>=0?res(x,y - 1,z):M,y + 1<height()?res(x,y + 1,z):M);
-        if (T1>T2) cimg::swap(T1,T2);
-        if (P<=0) return (Tfloat)T1;
-        if (T2<M && ___distance_eikonal(2,-2*(T1 + T2),T1*T1 + T2*T2 - P*P,root))
-          return std::max((Tfloat)T2,root);
-        return P + T1;
-      } else { // 1d.
-        if (P<=0) return (Tfloat)T1;
-        return P + T1;
-      }
-      return 0;
-    }
-
-    // Find max root of a 2nd-order polynomial.
-    static bool ___distance_eikonal(const Tfloat a, const Tfloat b, const Tfloat c, Tfloat &root) {
-      const Tfloat delta = b*b - 4*a*c;
-      if (delta<0) return false;
-      root = 0.5f*(-b + std::sqrt(delta))/a;
-      return true;
-    }
-
-    // Insert new point in heap.
-    template<typename t>
-    void _eik_priority_queue_insert(CImg<charT>& state, unsigned int& siz, const t value,
-                                    const unsigned int x, const unsigned int y, const unsigned int z) {
-      if (state(x,y,z)>0) return;
-      state(x,y,z) = 0;
-      if (++siz>=_width) { if (!is_empty()) resize(_width*2,4,1,1,0); else assign(64,4); }
-      (*this)(siz - 1,0) = (T)value; (*this)(siz - 1,1) = (T)x; (*this)(siz - 1,2) = (T)y; (*this)(siz - 1,3) = (T)z;
-      for (unsigned int pos = siz - 1, par = 0; pos && value>(*this)(par=(pos + 1)/2 - 1,0); pos = par) {
-        cimg::swap((*this)(pos,0),(*this)(par,0)); cimg::swap((*this)(pos,1),(*this)(par,1));
-        cimg::swap((*this)(pos,2),(*this)(par,2)); cimg::swap((*this)(pos,3),(*this)(par,3));
-      }
-    }
-
-    //! Compute distance function to 0-valued isophotes, using the Eikonal PDE.
-    /**
-       \param nb_iterations Number of PDE iterations.
-       \param band_size Size of the narrow band.
-       \param time_step Time step of the PDE iterations.
-    **/
-    CImg<T>& distance_eikonal(const unsigned int nb_iterations, const float band_size=0, const float time_step=0.5f) {
-      if (is_empty()) return *this;
-      CImg<Tfloat> velocity(*this);
-      for (unsigned int iteration = 0; iteration<nb_iterations; ++iteration) {
-        Tfloat *ptrd = velocity._data, veloc_max = 0;
-        if (_depth>1) { // 3d
-          CImg_3x3x3(I,Tfloat);
-          cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) if (band_size<=0 || cimg::abs(Iccc)<band_size) {
-            const Tfloat
-              gx = (Incc - Ipcc)/2,
-              gy = (Icnc - Icpc)/2,
-              gz = (Iccn - Iccp)/2,
-              sgn = -cimg::sign(Iccc),
-              ix = gx*sgn>0?(Incc - Iccc):(Iccc - Ipcc),
-              iy = gy*sgn>0?(Icnc - Iccc):(Iccc - Icpc),
-              iz = gz*sgn>0?(Iccn - Iccc):(Iccc - Iccp),
-              ng = 1e-5f + cimg::hypot(gx,gy,gz),
-              ngx = gx/ng,
-              ngy = gy/ng,
-              ngz = gz/ng,
-              veloc = sgn*(ngx*ix + ngy*iy + ngz*iz - 1);
-            *(ptrd++) = veloc;
-            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-          } else *(ptrd++) = 0;
-        } else { // 2d version
-          CImg_3x3(I,Tfloat);
-          cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat) if (band_size<=0 || cimg::abs(Icc)<band_size) {
-            const Tfloat
-              gx = (Inc - Ipc)/2,
-              gy = (Icn - Icp)/2,
-              sgn = -cimg::sign(Icc),
-              ix = gx*sgn>0?(Inc - Icc):(Icc - Ipc),
-              iy = gy*sgn>0?(Icn - Icc):(Icc - Icp),
-              ng = std::max((Tfloat)1e-5,cimg::hypot(gx,gy)),
-              ngx = gx/ng,
-              ngy = gy/ng,
-              veloc = sgn*(ngx*ix + ngy*iy - 1);
-            *(ptrd++) = veloc;
-            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
-          } else *(ptrd++) = 0;
-        }
-        if (veloc_max>0) *this+=(velocity*=time_step/veloc_max);
-      }
-      return *this;
-    }
-
-    //! Compute distance function to 0-valued isophotes, using the Eikonal PDE \newinstance.
-    CImg<Tfloat> get_distance_eikonal(const unsigned int nb_iterations, const float band_size=0,
-                                      const float time_step=0.5f) const {
-      return CImg<Tfloat>(*this,false).distance_eikonal(nb_iterations,band_size,time_step);
-    }
-
-    //! Compute Haar multiscale wavelet transform.
-    /**
-       \param axis Axis considered for the transform.
-       \param invert Set inverse of direct transform.
-       \param nb_scales Number of scales used for the transform.
-    **/
-    CImg<T>& haar(const char axis, const bool invert=false, const unsigned int nb_scales=1) {
-      return get_haar(axis,invert,nb_scales).move_to(*this);
-    }
-
-    //! Compute Haar multiscale wavelet transform \newinstance.
-    CImg<Tfloat> get_haar(const char axis, const bool invert=false, const unsigned int nb_scales=1) const {
-      if (is_empty() || !nb_scales) return +*this;
-      CImg<Tfloat> res;
-      const Tfloat sqrt2 = std::sqrt(2.0f);
-      if (nb_scales==1) {
-        switch (cimg::lowercase(axis)) { // Single scale transform
-        case 'x' : {
-          const unsigned int w = _width/2;
-          if (w) {
-            if ((w%2) && w!=1)
-              throw CImgInstanceException(_cimg_instance
-                                          "haar(): Sub-image width %u is not even.",
-                                          cimg_instance,
-                                          w);
-
-            res.assign(_width,_height,_depth,_spectrum);
-            if (invert) cimg_forYZC(*this,y,z,c) { // Inverse transform along X
-              for (unsigned int x = 0, xw = w, x2 = 0; x<w; ++x, ++xw) {
-                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(xw,y,z,c);
-                res(x2++,y,z,c) = (val0 - val1)/sqrt2;
-                res(x2++,y,z,c) = (val0 + val1)/sqrt2;
-              }
-            } else cimg_forYZC(*this,y,z,c) { // Direct transform along X
-              for (unsigned int x = 0, xw = w, x2 = 0; x<w; ++x, ++xw) {
-                const Tfloat val0 = (Tfloat)(*this)(x2++,y,z,c), val1 = (Tfloat)(*this)(x2++,y,z,c);
-                res(x,y,z,c) = (val0 + val1)/sqrt2;
-                res(xw,y,z,c) = (val1 - val0)/sqrt2;
-              }
-            }
-          } else return *this;
-        } break;
-        case 'y' : {
-          const unsigned int h = _height/2;
-          if (h) {
-            if ((h%2) && h!=1)
-              throw CImgInstanceException(_cimg_instance
-                                          "haar(): Sub-image height %u is not even.",
-                                          cimg_instance,
-                                          h);
-
-            res.assign(_width,_height,_depth,_spectrum);
-            if (invert) cimg_forXZC(*this,x,z,c) { // Inverse transform along Y
-              for (unsigned int y = 0, yh = h, y2 = 0; y<h; ++y, ++yh) {
-                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(x,yh,z,c);
-                res(x,y2++,z,c) = (val0 - val1)/sqrt2;
-                res(x,y2++,z,c) = (val0 + val1)/sqrt2;
-              }
-            } else cimg_forXZC(*this,x,z,c) {
-              for (unsigned int y = 0, yh = h, y2 = 0; y<h; ++y, ++yh) { // Direct transform along Y
-                const Tfloat val0 = (Tfloat)(*this)(x,y2++,z,c), val1 = (Tfloat)(*this)(x,y2++,z,c);
-                res(x,y,z,c)  = (val0 + val1)/sqrt2;
-                res(x,yh,z,c) = (val1 - val0)/sqrt2;
-              }
-            }
-          } else return *this;
-        } break;
-        case 'z' : {
-          const unsigned int d = _depth/2;
-          if (d) {
-            if ((d%2) && d!=1)
-              throw CImgInstanceException(_cimg_instance
-                                          "haar(): Sub-image depth %u is not even.",
-                                          cimg_instance,
-                                          d);
-
-            res.assign(_width,_height,_depth,_spectrum);
-            if (invert) cimg_forXYC(*this,x,y,c) { // Inverse transform along Z
-              for (unsigned int z = 0, zd = d, z2 = 0; z<d; ++z, ++zd) {
-                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(x,y,zd,c);
-                res(x,y,z2++,c) = (val0 - val1)/sqrt2;
-                res(x,y,z2++,c) = (val0 + val1)/sqrt2;
-              }
-            } else cimg_forXYC(*this,x,y,c) {
-              for (unsigned int z = 0, zd = d, z2 = 0; z<d; ++z, ++zd) { // Direct transform along Z
-                const Tfloat val0 = (Tfloat)(*this)(x,y,z2++,c), val1 = (Tfloat)(*this)(x,y,z2++,c);
-                res(x,y,z,c)  = (val0 + val1)/sqrt2;
-                res(x,y,zd,c) = (val1 - val0)/sqrt2;
-              }
-            }
-          } else return *this;
-        } break;
-        default :
-          throw CImgArgumentException(_cimg_instance
-                                      "haar(): Invalid specified axis '%c' "
-                                      "(should be { x | y | z }).",
-                                      cimg_instance,
-                                      axis);
-        }
-      } else { // Multi-scale version
-        if (invert) {
-          res.assign(*this);
-          switch (cimg::lowercase(axis)) {
-          case 'x' : {
-            unsigned int w = _width;
-            for (unsigned int s = 1; w && s<nb_scales; ++s) w/=2;
-            for (w = w?w:1; w<=_width; w*=2) res.draw_image(res.get_crop(0,w - 1).get_haar('x',true,1));
-          } break;
-          case 'y' : {
-            unsigned int h = _width;
-            for (unsigned int s = 1; h && s<nb_scales; ++s) h/=2;
-            for (h = h?h:1; h<=_height; h*=2) res.draw_image(res.get_crop(0,0,_width - 1,h - 1).get_haar('y',true,1));
-          } break;
-          case 'z' : {
-            unsigned int d = _depth;
-            for (unsigned int s = 1; d && s<nb_scales; ++s) d/=2;
-            for (d = d?d:1; d<=_depth; d*=2)
-              res.draw_image(res.get_crop(0,0,0,_width - 1,_height - 1,d - 1).get_haar('z',true,1));
-          } break;
-          default :
-            throw CImgArgumentException(_cimg_instance
-                                        "haar(): Invalid specified axis '%c' "
-                                        "(should be { x | y | z }).",
-                                        cimg_instance,
-                                        axis);
-          }
-        } else { // Direct transform
-          res = get_haar(axis,false,1);
-          switch (cimg::lowercase(axis)) {
-          case 'x' : {
-            for (unsigned int s = 1, w = _width/2; w && s<nb_scales; ++s, w/=2)
-              res.draw_image(res.get_crop(0,w - 1).get_haar('x',false,1));
-          } break;
-          case 'y' : {
-            for (unsigned int s = 1, h = _height/2; h && s<nb_scales; ++s, h/=2)
-              res.draw_image(res.get_crop(0,0,_width - 1,h - 1).get_haar('y',false,1));
-          } break;
-          case 'z' : {
-            for (unsigned int s = 1, d = _depth/2; d && s<nb_scales; ++s, d/=2)
-              res.draw_image(res.get_crop(0,0,0,_width - 1,_height - 1,d - 1).get_haar('z',false,1));
-          } break;
-          default :
-            throw CImgArgumentException(_cimg_instance
-                                        "haar(): Invalid specified axis '%c' "
-                                        "(should be { x | y | z }).",
-                                        cimg_instance,
-                                        axis);
-          }
-        }
-      }
-      return res;
-    }
-
-    //! Compute Haar multiscale wavelet transform \overloading.
-    /**
-       \param invert Set inverse of direct transform.
-       \param nb_scales Number of scales used for the transform.
-    **/
-    CImg<T>& haar(const bool invert=false, const unsigned int nb_scales=1) {
-      return get_haar(invert,nb_scales).move_to(*this);
-    }
-
-    //! Compute Haar multiscale wavelet transform \newinstance.
-    CImg<Tfloat> get_haar(const bool invert=false, const unsigned int nb_scales=1) const {
-      CImg<Tfloat> res;
-      if (nb_scales==1) { // Single scale transform
-        if (_width>1) get_haar('x',invert,1).move_to(res);
-        if (_height>1) { if (res) res.haar('y',invert,1); else get_haar('y',invert,1).move_to(res); }
-        if (_depth>1) { if (res) res.haar('z',invert,1); else get_haar('z',invert,1).move_to(res); }
-        if (res) return res;
-      } else { // Multi-scale transform
-        if (invert) { // Inverse transform
-          res.assign(*this);
-          if (_width>1) {
-            if (_height>1) {
-              if (_depth>1) {
-                unsigned int w = _width, h = _height, d = _depth;
-                for (unsigned int s = 1; w && h && d && s<nb_scales; ++s) { w/=2; h/=2; d/=2; }
-                for (w = w?w:1, h = h?h:1, d = d?d:1; w<=_width && h<=_height && d<=_depth; w*=2, h*=2, d*=2)
-                  res.draw_image(res.get_crop(0,0,0,w - 1,h - 1,d - 1).get_haar(true,1));
-              } else {
-                unsigned int w = _width, h = _height;
-                for (unsigned int s = 1; w && h && s<nb_scales; ++s) { w/=2; h/=2; }
-                for (w = w?w:1, h = h?h:1; w<=_width && h<=_height; w*=2, h*=2)
-                  res.draw_image(res.get_crop(0,0,0,w - 1,h - 1,0).get_haar(true,1));
-              }
-            } else {
-              if (_depth>1) {
-                unsigned int w = _width, d = _depth;
-                for (unsigned int s = 1; w && d && s<nb_scales; ++s) { w/=2; d/=2; }
-                for (w = w?w:1, d = d?d:1; w<=_width && d<=_depth; w*=2, d*=2)
-                  res.draw_image(res.get_crop(0,0,0,w - 1,0,d - 1).get_haar(true,1));
-              } else {
-                unsigned int w = _width;
-                for (unsigned int s = 1; w && s<nb_scales; ++s) w/=2;
-                for (w = w?w:1; w<=_width; w*=2)
-                  res.draw_image(res.get_crop(0,0,0,w - 1,0,0).get_haar(true,1));
-              }
-            }
-          } else {
-            if (_height>1) {
-              if (_depth>1) {
-                unsigned int h = _height, d = _depth;
-                for (unsigned int s = 1; h && d && s<nb_scales; ++s) { h/=2; d/=2; }
-                for (h = h?h:1, d = d?d:1; h<=_height && d<=_depth; h*=2, d*=2)
-                  res.draw_image(res.get_crop(0,0,0,0,h - 1,d - 1).get_haar(true,1));
-              } else {
-                unsigned int h = _height;
-                for (unsigned int s = 1; h && s<nb_scales; ++s) h/=2;
-                for (h = h?h:1; h<=_height; h*=2)
-                  res.draw_image(res.get_crop(0,0,0,0,h - 1,0).get_haar(true,1));
-              }
-            } else {
-              if (_depth>1) {
-                unsigned int d = _depth;
-                for (unsigned int s = 1; d && s<nb_scales; ++s) d/=2;
-                for (d = d?d:1; d<=_depth; d*=2)
-                  res.draw_image(res.get_crop(0,0,0,0,0,d - 1).get_haar(true,1));
-              } else return *this;
-            }
-          }
-        } else { // Direct transform
-          res = get_haar(false,1);
-          if (_width>1) {
-            if (_height>1) {
-              if (_depth>1)
-                for (unsigned int s = 1, w = _width/2, h = _height/2, d = _depth/2; w && h && d && s<nb_scales;
-                     ++s, w/=2, h/=2, d/=2)
-                  res.draw_image(res.get_crop(0,0,0,w - 1,h - 1,d - 1).haar(false,1));
-              else for (unsigned int s = 1, w = _width/2, h = _height/2; w && h && s<nb_scales; ++s, w/=2, h/=2)
-                     res.draw_image(res.get_crop(0,0,0,w - 1,h - 1,0).haar(false,1));
-            } else {
-              if (_depth>1) for (unsigned int s = 1, w = _width/2, d = _depth/2; w && d && s<nb_scales; ++s, w/=2, d/=2)
-                              res.draw_image(res.get_crop(0,0,0,w - 1,0,d - 1).haar(false,1));
-              else for (unsigned int s = 1, w = _width/2; w && s<nb_scales; ++s, w/=2)
-                     res.draw_image(res.get_crop(0,0,0,w - 1,0,0).haar(false,1));
-            }
-          } else {
-            if (_height>1) {
-              if (_depth>1)
-                for (unsigned int s = 1, h = _height/2, d = _depth/2; h && d && s<nb_scales; ++s, h/=2, d/=2)
-                  res.draw_image(res.get_crop(0,0,0,0,h - 1,d - 1).haar(false,1));
-              else for (unsigned int s = 1, h = _height/2; h && s<nb_scales; ++s, h/=2)
-                     res.draw_image(res.get_crop(0,0,0,0,h - 1,0).haar(false,1));
-            } else {
-              if (_depth>1) for (unsigned int s = 1, d = _depth/2; d && s<nb_scales; ++s, d/=2)
-                              res.draw_image(res.get_crop(0,0,0,0,0,d - 1).haar(false,1));
-              else return *this;
-            }
-          }
-        }
-        return res;
-      }
-      return *this;
-    }
-
-    //! Compute 1d Fast Fourier Transform, along a specified axis.
-    /**
-       \param axis Axis along which the FFT is computed.
-       \param is_invert Tells if the forward (\c false) or inverse (\c true) FFT is computed.
-    **/
-    CImgList<Tfloat> get_FFT(const char axis, const bool is_invert=false) const {
-      CImgList<Tfloat> res(*this,CImg<Tfloat>());
-      CImg<Tfloat>::FFT(res[0],res[1],axis,is_invert);
-      return res;
-    }
-
-    //! Compute n-d Fast Fourier Transform.
-    /*
-      \param is_invert Tells if the forward (\c false) or inverse (\c true) FFT is computed.
-    **/
-    CImgList<Tfloat> get_FFT(const bool is_invert=false) const {
-      CImgList<Tfloat> res(*this,CImg<Tfloat>());
-      CImg<Tfloat>::FFT(res[0],res[1],is_invert);
-      return res;
-    }
-
-    //! Compute 1d Fast Fourier Transform, along a specified axis.
-    /**
-       \param[in,out] real Real part of the pixel values.
-       \param[in,out] imag Imaginary part of the pixel values.
-       \param axis Axis along which the FFT is computed.
-       \param is_invert Tells if the forward (\c false) or inverse (\c true) FFT is computed.
-    **/
-    static void FFT(CImg<T>& real, CImg<T>& imag, const char axis, const bool is_invert=false) {
-      if (!real)
-        throw CImgInstanceException("CImg<%s>::FFT(): Specified real part is empty.",
-                                    pixel_type());
-
-      if (!imag) imag.assign(real._width,real._height,real._depth,real._spectrum,(T)0);
-      if (!real.is_sameXYZC(imag))
-        throw CImgInstanceException("CImg<%s>::FFT(): Specified real part (%u,%u,%u,%u,%p) and "
-                                    "imaginary part (%u,%u,%u,%u,%p) have different dimensions.",
-                                    pixel_type(),
-                                    real._width,real._height,real._depth,real._spectrum,real._data,
-                                    imag._width,imag._height,imag._depth,imag._spectrum,imag._data);
-#ifdef cimg_use_fftw3
-      cimg::mutex(12);
-      fftw_complex *data_in;
-      fftw_plan data_plan;
-
-      switch (cimg::lowercase(axis)) {
-      case 'x' : { // Fourier along X, using FFTW library.
-        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex)*real._width);
-        if (!data_in) throw CImgInstanceException("CImgList<%s>::FFT(): Failed to allocate memory (%s) "
-                                                  "for computing FFT of image (%u,%u,%u,%u) along the X-axis.",
-                                                  pixel_type(),
-                                                  cimg::strbuffersize(sizeof(fftw_complex)*real._width),
-                                                  real._width,real._height,real._depth,real._spectrum);
-
-        data_plan = fftw_plan_dft_1d(real._width,data_in,data_in,is_invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
-        cimg_forYZC(real,y,z,c) {
-          T *ptrr = real.data(0,y,z,c), *ptri = imag.data(0,y,z,c);
-          double *ptrd = (double*)data_in;
-          cimg_forX(real,x) { *(ptrd++) = (double)*(ptrr++); *(ptrd++) = (double)*(ptri++); }
-          fftw_execute(data_plan);
-          const unsigned int fact = real._width;
-          if (is_invert) cimg_forX(real,x) { *(--ptri) = (T)(*(--ptrd)/fact); *(--ptrr) = (T)(*(--ptrd)/fact); }
-          else cimg_forX(real,x) { *(--ptri) = (T)*(--ptrd); *(--ptrr) = (T)*(--ptrd); }
-        }
-      } break;
-      case 'y' : { // Fourier along Y, using FFTW library.
-        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex) * real._height);
-        if (!data_in) throw CImgInstanceException("CImgList<%s>::FFT(): Failed to allocate memory (%s) "
-                                                  "for computing FFT of image (%u,%u,%u,%u) along the Y-axis.",
-                                                  pixel_type(),
-                                                  cimg::strbuffersize(sizeof(fftw_complex)*real._height),
-                                                  real._width,real._height,real._depth,real._spectrum);
-
-        data_plan = fftw_plan_dft_1d(real._height,data_in,data_in,is_invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
-        const unsigned int off = real._width;
-        cimg_forXZC(real,x,z,c) {
-          T *ptrr = real.data(x,0,z,c), *ptri = imag.data(x,0,z,c);
-          double *ptrd = (double*)data_in;
-          cimg_forY(real,y) { *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri; ptrr+=off; ptri+=off; }
-          fftw_execute(data_plan);
-          const unsigned int fact = real._height;
-          if (is_invert)
-            cimg_forY(real,y) { ptrr-=off; ptri-=off; *ptri = (T)(*(--ptrd)/fact); *ptrr = (T)(*(--ptrd)/fact); }
-          else cimg_forY(real,y) { ptrr-=off; ptri-=off; *ptri = (T)*(--ptrd); *ptrr = (T)*(--ptrd); }
-        }
-      } break;
-      case 'z' : { // Fourier along Z, using FFTW library.
-        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex) * real._depth);
-        if (!data_in) throw CImgInstanceException("CImgList<%s>::FFT(): Failed to allocate memory (%s) "
-                                                  "for computing FFT of image (%u,%u,%u,%u) along the Z-axis.",
-                                                  pixel_type(),
-                                                  cimg::strbuffersize(sizeof(fftw_complex)*real._depth),
-                                                  real._width,real._height,real._depth,real._spectrum);
-
-        data_plan = fftw_plan_dft_1d(real._depth,data_in,data_in,is_invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
-        const ulongT off = (ulongT)real._width*real._height;
-        cimg_forXYC(real,x,y,c) {
-          T *ptrr = real.data(x,y,0,c), *ptri = imag.data(x,y,0,c);
-          double *ptrd = (double*)data_in;
-          cimg_forZ(real,z) { *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri; ptrr+=off; ptri+=off; }
-          fftw_execute(data_plan);
-          const unsigned int fact = real._depth;
-          if (is_invert)
-            cimg_forZ(real,z) { ptrr-=off; ptri-=off; *ptri = (T)(*(--ptrd)/fact); *ptrr = (T)(*(--ptrd)/fact); }
-          else cimg_forZ(real,z) { ptrr-=off; ptri-=off; *ptri = (T)*(--ptrd); *ptrr = (T)*(--ptrd); }
-        }
-      } break;
-      default :
-        throw CImgArgumentException("CImgList<%s>::FFT(): Invalid specified axis '%c' for real and imaginary parts "
-                                    "(%u,%u,%u,%u) "
-                                    "(should be { x | y | z }).",
-                                    pixel_type(),axis,
-                                    real._width,real._height,real._depth,real._spectrum);
-      }
-      fftw_destroy_plan(data_plan);
-      fftw_free(data_in);
-      cimg::mutex(12,0);
-#else
-      switch (cimg::lowercase(axis)) {
-      case 'x' : { // Fourier along X, using built-in functions.
-        const unsigned int N = real._width, N2 = N>>1;
-        if (((N - 1)&N) && N!=1)
-          throw CImgInstanceException("CImgList<%s>::FFT(): Specified real and imaginary parts (%u,%u,%u,%u) "
-                                      "have non 2^N dimension along the X-axis.",
-                                      pixel_type(),
-                                      real._width,real._height,real._depth,real._spectrum);
-
-        for (unsigned int i = 0, j = 0; i<N2; ++i) {
-          if (j>i) cimg_forYZC(real,y,z,c) {
-              cimg::swap(real(i,y,z,c),real(j,y,z,c));
-              cimg::swap(imag(i,y,z,c),imag(j,y,z,c));
-              if (j<N2) {
-                const unsigned int ri = N - 1 - i, rj = N - 1 - j;
-                cimg::swap(real(ri,y,z,c),real(rj,y,z,c));
-                cimg::swap(imag(ri,y,z,c),imag(rj,y,z,c));
-              }
-            }
-          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
-        }
-        for (unsigned int delta = 2; delta<=N; delta<<=1) {
-          const unsigned int delta2 = delta>>1;
-          for (unsigned int i = 0; i<N; i+=delta) {
-            float wr = 1, wi = 0;
-            const float
-              angle = (float)((is_invert?+1:-1)*2*cimg::PI/delta),
-              ca = (float)std::cos(angle),
-              sa = (float)std::sin(angle);
-            for (unsigned int k = 0; k<delta2; ++k) {
-              const unsigned int j = i + k, nj = j + delta2;
-              cimg_forYZC(real,y,z,c) {
-                T &ir = real(j,y,z,c), &ii = imag(j,y,z,c), &nir = real(nj,y,z,c), &nii = imag(nj,y,z,c);
-                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
-                nir = (T)(ir - tmpr);
-                nii = (T)(ii - tmpi);
-                ir+=(T)tmpr;
-                ii+=(T)tmpi;
-              }
-              const float nwr = wr*ca-wi*sa;
-              wi = wi*ca + wr*sa;
-              wr = nwr;
-            }
-          }
-        }
-        if (is_invert) { real/=N; imag/=N; }
-      } break;
-      case 'y' : { // Fourier along Y, using built-in functions.
-        const unsigned int N = real._height, N2 = N>>1;
-        if (((N - 1)&N) && N!=1)
-          throw CImgInstanceException("CImgList<%s>::FFT(): Specified real and imaginary parts (%u,%u,%u,%u) "
-                                      "have non 2^N dimension along the Y-axis.",
-                                      pixel_type(),
-                                      real._width,real._height,real._depth,real._spectrum);
-
-        for (unsigned int i = 0, j = 0; i<N2; ++i) {
-          if (j>i) cimg_forXZC(real,x,z,c) {
-              cimg::swap(real(x,i,z,c),real(x,j,z,c));
-              cimg::swap(imag(x,i,z,c),imag(x,j,z,c));
-              if (j<N2) {
-                const unsigned int ri = N - 1 - i, rj = N - 1 - j;
-                cimg::swap(real(x,ri,z,c),real(x,rj,z,c));
-                cimg::swap(imag(x,ri,z,c),imag(x,rj,z,c));
-              }
-            }
-          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
-        }
-        for (unsigned int delta = 2; delta<=N; delta<<=1) {
-          const unsigned int delta2 = (delta>>1);
-          for (unsigned int i = 0; i<N; i+=delta) {
-            float wr = 1, wi = 0;
-            const float
-              angle = (float)((is_invert?+1:-1)*2*cimg::PI/delta),
-              ca = (float)std::cos(angle),
-              sa = (float)std::sin(angle);
-            for (unsigned int k = 0; k<delta2; ++k) {
-              const unsigned int j = i + k, nj = j + delta2;
-              cimg_forXZC(real,x,z,c) {
-                T &ir = real(x,j,z,c), &ii = imag(x,j,z,c), &nir = real(x,nj,z,c), &nii = imag(x,nj,z,c);
-                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
-                nir = (T)(ir - tmpr);
-                nii = (T)(ii - tmpi);
-                ir+=(T)tmpr;
-                ii+=(T)tmpi;
-              }
-              const float nwr = wr*ca-wi*sa;
-              wi = wi*ca + wr*sa;
-              wr = nwr;
-            }
-          }
-        }
-        if (is_invert) { real/=N; imag/=N; }
-      } break;
-      case 'z' : { // Fourier along Z, using built-in functions.
-        const unsigned int N = real._depth, N2 = N>>1;
-        if (((N - 1)&N) && N!=1)
-          throw CImgInstanceException("CImgList<%s>::FFT(): Specified real and imaginary parts (%u,%u,%u,%u) "
-                                      "have non 2^N dimension along the Z-axis.",
-                                      pixel_type(),
-                                      real._width,real._height,real._depth,real._spectrum);
-
-        for (unsigned int i = 0, j = 0; i<N2; ++i) {
-          if (j>i) cimg_forXYC(real,x,y,c) {
-              cimg::swap(real(x,y,i,c),real(x,y,j,c));
-              cimg::swap(imag(x,y,i,c),imag(x,y,j,c));
-              if (j<N2) {
-                const unsigned int ri = N - 1 - i, rj = N - 1 - j;
-                cimg::swap(real(x,y,ri,c),real(x,y,rj,c));
-                cimg::swap(imag(x,y,ri,c),imag(x,y,rj,c));
-              }
-            }
-          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
-        }
-        for (unsigned int delta = 2; delta<=N; delta<<=1) {
-          const unsigned int delta2 = (delta>>1);
-          for (unsigned int i = 0; i<N; i+=delta) {
-            float wr = 1, wi = 0;
-            const float
-              angle = (float)((is_invert?+1:-1)*2*cimg::PI/delta),
-              ca = (float)std::cos(angle),
-              sa = (float)std::sin(angle);
-            for (unsigned int k = 0; k<delta2; ++k) {
-              const unsigned int j = i + k, nj = j + delta2;
-              cimg_forXYC(real,x,y,c) {
-                T &ir = real(x,y,j,c), &ii = imag(x,y,j,c), &nir = real(x,y,nj,c), &nii = imag(x,y,nj,c);
-                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
-                nir = (T)(ir - tmpr);
-                nii = (T)(ii - tmpi);
-                ir+=(T)tmpr;
-                ii+=(T)tmpi;
-              }
-              const float nwr = wr*ca-wi*sa;
-              wi = wi*ca + wr*sa;
-              wr = nwr;
-            }
-          }
-        }
-        if (is_invert) { real/=N; imag/=N; }
-      } break;
-      default :
-        throw CImgArgumentException("CImgList<%s>::FFT(): Invalid specified axis '%c' for real and imaginary parts "
-                                    "(%u,%u,%u,%u) "
-                                    "(should be { x | y | z }).",
-                                    pixel_type(),axis,
-                                    real._width,real._height,real._depth,real._spectrum);
-      }
-#endif
-    }
-
-    //! Compute n-d Fast Fourier Transform.
-    /**
-       \param[in,out] real Real part of the pixel values.
-       \param[in,out] imag Imaginary part of the pixel values.
-       \param is_invert Tells if the forward (\c false) or inverse (\c true) FFT is computed.
-       \param nb_threads Number of parallel threads used for the computation.
-         Use \c 0 to set this to the number of available cpus.
-    **/
-    static void FFT(CImg<T>& real, CImg<T>& imag, const bool is_invert=false, const unsigned int nb_threads=0) {
-      if (!real)
-        throw CImgInstanceException("CImgList<%s>::FFT(): Empty specified real part.",
-                                    pixel_type());
-
-      if (!imag) imag.assign(real._width,real._height,real._depth,real._spectrum,(T)0);
-      if (!real.is_sameXYZC(imag))
-        throw CImgInstanceException("CImgList<%s>::FFT(): Specified real part (%u,%u,%u,%u,%p) and "
-                                    "imaginary part (%u,%u,%u,%u,%p) have different dimensions.",
-                                    pixel_type(),
-                                    real._width,real._height,real._depth,real._spectrum,real._data,
-                                    imag._width,imag._height,imag._depth,imag._spectrum,imag._data);
-
-#ifdef cimg_use_fftw3
-      cimg::mutex(12);
-#ifndef cimg_use_fftw3_singlethread
-      const unsigned int _nb_threads = nb_threads?nb_threads:cimg::nb_cpus();
-      static int fftw_st = fftw_init_threads();
-      cimg::unused(fftw_st);
-      fftw_plan_with_nthreads(_nb_threads);
-#else
-      cimg::unused(nb_threads);
-#endif
-      fftw_complex *data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex)*real._width*real._height*real._depth);
-      if (!data_in) throw CImgInstanceException("CImgList<%s>::FFT(): Failed to allocate memory (%s) "
-                                                "for computing FFT of image (%u,%u,%u,%u).",
-                                                pixel_type(),
-                                                cimg::strbuffersize(sizeof(fftw_complex)*real._width*
-                                                                    real._height*real._depth*real._spectrum),
-                                                real._width,real._height,real._depth,real._spectrum);
-
-      fftw_plan data_plan;
-      const ulongT w = (ulongT)real._width, wh = w*real._height, whd = wh*real._depth;
-      data_plan = fftw_plan_dft_3d(real._width,real._height,real._depth,data_in,data_in,
-                                   is_invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
-      cimg_forC(real,c) {
-        T *ptrr = real.data(0,0,0,c), *ptri = imag.data(0,0,0,c);
-        double *ptrd = (double*)data_in;
-        for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh - 1, ptri-=wh - 1)
-          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
-            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
-              *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri;
-            }
-        fftw_execute(data_plan);
-        ptrd = (double*)data_in;
-        ptrr = real.data(0,0,0,c);
-        ptri = imag.data(0,0,0,c);
-        if (!is_invert) for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh - 1, ptri-=wh - 1)
-          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
-            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
-              *ptrr = (T)*(ptrd++); *ptri = (T)*(ptrd++);
-            }
-        else for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh - 1, ptri-=wh - 1)
-          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
-            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
-              *ptrr = (T)(*(ptrd++)/whd); *ptri = (T)(*(ptrd++)/whd);
-            }
-      }
-      fftw_destroy_plan(data_plan);
-      fftw_free(data_in);
-#ifndef cimg_use_fftw3_singlethread
-      fftw_cleanup_threads();
-#endif
-      cimg::mutex(12,0);
-#else
-      cimg::unused(nb_threads);
-      if (real._depth>1) FFT(real,imag,'z',is_invert);
-      if (real._height>1) FFT(real,imag,'y',is_invert);
-      if (real._width>1) FFT(real,imag,'x',is_invert);
-#endif
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name 3d Objects Management
-    //@{
-    //-------------------------------------
-
-    //! Shift 3d object's vertices.
-    /**
-       \param tx X-coordinate of the 3d displacement vector.
-       \param ty Y-coordinate of the 3d displacement vector.
-       \param tz Z-coordinate of the 3d displacement vector.
-    **/
-    CImg<T>& shift_object3d(const float tx, const float ty=0, const float tz=0) {
-      if (_height!=3 || _depth>1 || _spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "shift_object3d(): Instance is not a set of 3d vertices.",
-                                    cimg_instance);
-
-      get_shared_row(0)+=tx; get_shared_row(1)+=ty; get_shared_row(2)+=tz;
-      return *this;
-    }
-
-    //! Shift 3d object's vertices \newinstance.
-    CImg<Tfloat> get_shift_object3d(const float tx, const float ty=0, const float tz=0) const {
-      return CImg<Tfloat>(*this,false).shift_object3d(tx,ty,tz);
-    }
-
-    //! Shift 3d object's vertices, so that it becomes centered.
-    /**
-       \note The object center is computed as its barycenter.
-    **/
-    CImg<T>& shift_object3d() {
-      if (_height!=3 || _depth>1 || _spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "shift_object3d(): Instance is not a set of 3d vertices.",
-                                    cimg_instance);
-
-      CImg<T> xcoords = get_shared_row(0), ycoords = get_shared_row(1), zcoords = get_shared_row(2);
-      float
-        xm, xM = (float)xcoords.max_min(xm),
-        ym, yM = (float)ycoords.max_min(ym),
-        zm, zM = (float)zcoords.max_min(zm);
-      xcoords-=(xm + xM)/2; ycoords-=(ym + yM)/2; zcoords-=(zm + zM)/2;
-      return *this;
-    }
-
-    //! Shift 3d object's vertices, so that it becomes centered \newinstance.
-    CImg<Tfloat> get_shift_object3d() const {
-      return CImg<Tfloat>(*this,false).shift_object3d();
-    }
-
-    //! Resize 3d object.
-    /**
-       \param sx Width of the 3d object's bounding box.
-       \param sy Height of the 3d object's bounding box.
-       \param sz Depth of the 3d object's bounding box.
-    **/
-    CImg<T>& resize_object3d(const float sx, const float sy=-100, const float sz=-100) {
-      if (_height!=3 || _depth>1 || _spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "resize_object3d(): Instance is not a set of 3d vertices.",
-                                    cimg_instance);
-
-      CImg<T> xcoords = get_shared_row(0), ycoords = get_shared_row(1), zcoords = get_shared_row(2);
-      float
-        xm, xM = (float)xcoords.max_min(xm),
-        ym, yM = (float)ycoords.max_min(ym),
-        zm, zM = (float)zcoords.max_min(zm);
-      if (xm<xM) { if (sx>0) xcoords*=sx/(xM-xm); else xcoords*=-sx/100; }
-      if (ym<yM) { if (sy>0) ycoords*=sy/(yM-ym); else ycoords*=-sy/100; }
-      if (zm<zM) { if (sz>0) zcoords*=sz/(zM-zm); else zcoords*=-sz/100; }
-      return *this;
-    }
-
-    //! Resize 3d object \newinstance.
-    CImg<Tfloat> get_resize_object3d(const float sx, const float sy=-100, const float sz=-100) const {
-      return CImg<Tfloat>(*this,false).resize_object3d(sx,sy,sz);
-    }
-
-    //! Resize 3d object to unit size.
-    CImg<T> resize_object3d() {
-      if (_height!=3 || _depth>1 || _spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "resize_object3d(): Instance is not a set of 3d vertices.",
-                                    cimg_instance);
-
-      CImg<T> xcoords = get_shared_row(0), ycoords = get_shared_row(1), zcoords = get_shared_row(2);
-      float
-        xm, xM = (float)xcoords.max_min(xm),
-        ym, yM = (float)ycoords.max_min(ym),
-        zm, zM = (float)zcoords.max_min(zm);
-      const float dx = xM - xm, dy = yM - ym, dz = zM - zm, dmax = cimg::max(dx,dy,dz);
-      if (dmax>0) { xcoords/=dmax; ycoords/=dmax; zcoords/=dmax; }
-      return *this;
-    }
-
-    //! Resize 3d object to unit size \newinstance.
-    CImg<Tfloat> get_resize_object3d() const {
-      return CImg<Tfloat>(*this,false).resize_object3d();
-    }
-
-    //! Merge two 3d objects together.
-    /**
-       \param[in,out] primitives Primitives data of the current 3d object.
-       \param obj_vertices Vertices data of the additional 3d object.
-       \param obj_primitives Primitives data of the additional 3d object.
-    **/
-    template<typename tf, typename tp, typename tff>
-    CImg<T>& append_object3d(CImgList<tf>& primitives, const CImg<tp>& obj_vertices,
-                             const CImgList<tff>& obj_primitives) {
-      if (!obj_vertices || !obj_primitives) return *this;
-      if (obj_vertices._height!=3 || obj_vertices._depth>1 || obj_vertices._spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "append_object3d(): Specified vertice image (%u,%u,%u,%u,%p) is not a "
-                                    "set of 3d vertices.",
-                                    cimg_instance,
-                                    obj_vertices._width,obj_vertices._height,
-                                    obj_vertices._depth,obj_vertices._spectrum,obj_vertices._data);
-
-      if (is_empty()) { primitives.assign(obj_primitives); return assign(obj_vertices); }
-      if (_height!=3 || _depth>1 || _spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "append_object3d(): Instance is not a set of 3d vertices.",
-                                    cimg_instance);
-
-      const unsigned int P = _width;
-      append(obj_vertices,'x');
-      const unsigned int N = primitives._width;
-      primitives.insert(obj_primitives);
-      for (unsigned int i = N; i<primitives._width; ++i) {
-        CImg<tf> &p = primitives[i];
-        switch (p.size()) {
-        case 1 : p[0]+=P; break; // Point.
-        case 5 : p[0]+=P; p[1]+=P; break; // Sphere.
-        case 2 : case 6 : p[0]+=P; p[1]+=P; break; // Segment.
-        case 3 : case 9 : p[0]+=P; p[1]+=P; p[2]+=P; break; // Triangle.
-        case 4 : case 12 : p[0]+=P; p[1]+=P; p[2]+=P; p[3]+=P; break; // Rectangle.
-        }
-      }
-      return *this;
-    }
-
-    //! Texturize primitives of a 3d object.
-    /**
-       \param[in,out] primitives Primitives data of the 3d object.
-       \param[in,out] colors Colors data of the 3d object.
-       \param texture Texture image to map to 3d object.
-       \param coords Texture-mapping coordinates.
-    **/
-    template<typename tp, typename tc, typename tt, typename tx>
-    const CImg<T>& texturize_object3d(CImgList<tp>& primitives, CImgList<tc>& colors,
-                                      const CImg<tt>& texture, const CImg<tx>& coords=CImg<tx>::const_empty()) const {
-      if (is_empty()) return *this;
-      if (_height!=3)
-        throw CImgInstanceException(_cimg_instance
-                                    "texturize_object3d(): image instance is not a set of 3d points.",
-                                    cimg_instance);
-      if (coords && (coords._width!=_width || coords._height!=2))
-        throw CImgArgumentException(_cimg_instance
-                                    "texturize_object3d(): Invalid specified texture coordinates (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    coords._width,coords._height,coords._depth,coords._spectrum,coords._data);
-      CImg<intT> _coords;
-      if (!coords) { // If no texture coordinates specified, do a default XY-projection.
-        _coords.assign(_width,2);
-        float
-          xmin, xmax = (float)get_shared_row(0).max_min(xmin),
-          ymin, ymax = (float)get_shared_row(1).max_min(ymin),
-          dx = xmax>xmin?xmax-xmin:1,
-          dy = ymax>ymin?ymax-ymin:1;
-        cimg_forX(*this,p) {
-          _coords(p,0) = (int)(((*this)(p,0) - xmin)*texture._width/dx);
-          _coords(p,1) = (int)(((*this)(p,1) - ymin)*texture._height/dy);
-        }
-      } else _coords = coords;
-
-      int texture_ind = -1;
-      cimglist_for(primitives,l) {
-        CImg<tp> &p = primitives[l];
-        const unsigned int siz = p.size();
-        switch (siz) {
-        case 1 : { // Point.
-          const unsigned int i0 = (unsigned int)p[0];
-          const int x0 = _coords(i0,0), y0 = _coords(i0,1);
-          texture.get_vector_at(x0<=0?0:x0>=texture.width()?texture.width() - 1:x0,
-                                y0<=0?0:y0>=texture.height()?texture.height() - 1:y0).move_to(colors[l]);
-        } break;
-        case 2 : case 6 : { // Line.
-          const unsigned int i0 = (unsigned int)p[0], i1 = (unsigned int)p[1];
-          const int
-            x0 = _coords(i0,0), y0 = _coords(i0,1),
-            x1 = _coords(i1,0), y1 = _coords(i1,1);
-          if (texture_ind<0) colors[texture_ind=l].assign(texture,false);
-          else colors[l].assign(colors[texture_ind],true);
-          CImg<tp>::vector(i0,i1,x0,y0,x1,y1).move_to(p);
-        } break;
-        case 3 : case 9 : { // Triangle.
-          const unsigned int i0 = (unsigned int)p[0], i1 = (unsigned int)p[1], i2 = (unsigned int)p[2];
-          const int
-            x0 = _coords(i0,0), y0 = _coords(i0,1),
-            x1 = _coords(i1,0), y1 = _coords(i1,1),
-            x2 = _coords(i2,0), y2 = _coords(i2,1);
-          if (texture_ind<0) colors[texture_ind=l].assign(texture,false);
-          else colors[l].assign(colors[texture_ind],true);
-          CImg<tp>::vector(i0,i1,i2,x0,y0,x1,y1,x2,y2).move_to(p);
-        } break;
-        case 4 : case 12 : { // Quadrangle.
-          const unsigned int
-            i0 = (unsigned int)p[0], i1 = (unsigned int)p[1], i2 = (unsigned int)p[2], i3 = (unsigned int)p[3];
-          const int
-            x0 = _coords(i0,0), y0 = _coords(i0,1),
-            x1 = _coords(i1,0), y1 = _coords(i1,1),
-            x2 = _coords(i2,0), y2 = _coords(i2,1),
-            x3 = _coords(i3,0), y3 = _coords(i3,1);
-          if (texture_ind<0) colors[texture_ind=l].assign(texture,false);
-          else colors[l].assign(colors[texture_ind],true);
-          CImg<tp>::vector(i0,i1,i2,i3,x0,y0,x1,y1,x2,y2,x3,y3).move_to(p);
-        } break;
-        }
-      }
-      return *this;
-    }
-
-    //! Generate a 3d elevation of the image instance.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param[out] colors The returned list of the 3d object colors.
-       \param elevation The input elevation map.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");
-       CImgList<unsigned int> faces3d;
-       CImgList<unsigned char> colors3d;
-       const CImg<float> points3d = img.get_elevation3d(faces3d,colors3d,img.get_norm()*0.2);
-       CImg<unsigned char>().display_object3d("Elevation3d",points3d,faces3d,colors3d);
-       \endcode
-       \image html ref_elevation3d.jpg
-    **/
-    template<typename tf, typename tc, typename te>
-    CImg<floatT> get_elevation3d(CImgList<tf>& primitives, CImgList<tc>& colors, const CImg<te>& elevation) const {
-      if (!is_sameXY(elevation) || elevation._depth>1 || elevation._spectrum>1)
-        throw CImgArgumentException(_cimg_instance
-                                    "get_elevation3d(): Instance and specified elevation (%u,%u,%u,%u,%p) "
-                                    "have incompatible dimensions.",
-                                    cimg_instance,
-                                    elevation._width,elevation._height,elevation._depth,
-                                    elevation._spectrum,elevation._data);
-      if (is_empty()) return *this;
-      float m, M = (float)max_min(m);
-      if (M==m) ++M;
-      colors.assign();
-      const unsigned int size_x1 = _width - 1, size_y1 = _height - 1;
-      for (unsigned int y = 0; y<size_y1; ++y)
-        for (unsigned int x = 0; x<size_x1; ++x) {
-          const unsigned char
-            r = (unsigned char)(((*this)(x,y,0) - m)*255/(M-m)),
-            g = (unsigned char)(_spectrum>1?((*this)(x,y,1) - m)*255/(M-m):r),
-            b = (unsigned char)(_spectrum>2?((*this)(x,y,2) - m)*255/(M-m):_spectrum>1?0:r);
-          CImg<tc>::vector((tc)r,(tc)g,(tc)b).move_to(colors);
-        }
-      const typename CImg<te>::_functor2d_int func(elevation);
-      return elevation3d(primitives,func,0,0,_width - 1.0f,_height - 1.0f,_width,_height);
-    }
-
-    //! Generate the 3d projection planes of the image instance.
-    /**
-       \param[out] primitives Primitives data of the returned 3d object.
-       \param[out] colors Colors data of the returned 3d object.
-       \param x0 X-coordinate of the projection point.
-       \param y0 Y-coordinate of the projection point.
-       \param z0 Z-coordinate of the projection point.
-       \param normalize_colors Tells if the created textures have normalized colors.
-    **/
-    template<typename tf, typename tc>
-    CImg<floatT> get_projections3d(CImgList<tf>& primitives, CImgList<tc>& colors,
-                                   const unsigned int x0, const unsigned int y0, const unsigned int z0,
-                                   const bool normalize_colors=false) const {
-      float m = 0, M = 0, delta = 1;
-      if (normalize_colors) { m = (float)min_max(M); delta = 255/(m==M?1:M-m); }
-      const unsigned int
-        _x0 = (x0>=_width)?_width - 1:x0,
-        _y0 = (y0>=_height)?_height - 1:y0,
-        _z0 = (z0>=_depth)?_depth - 1:z0;
-      CImg<tc> img_xy, img_xz, img_yz;
-      if (normalize_colors) {
-        ((get_crop(0,0,_z0,0,_width - 1,_height - 1,_z0,_spectrum - 1)-=m)*=delta).move_to(img_xy);
-        ((get_crop(0,_y0,0,0,_width - 1,_y0,_depth - 1,_spectrum - 1)-=m)*=delta).resize(_width,_depth,1,-100,-1).
-          move_to(img_xz);
-        ((get_crop(_x0,0,0,0,_x0,_height - 1,_depth - 1,_spectrum - 1)-=m)*=delta).resize(_height,_depth,1,-100,-1).
-          move_to(img_yz);
-      } else {
-        get_crop(0,0,_z0,0,_width - 1,_height - 1,_z0,_spectrum - 1).move_to(img_xy);
-        get_crop(0,_y0,0,0,_width - 1,_y0,_depth - 1,_spectrum - 1).resize(_width,_depth,1,-100,-1).move_to(img_xz);
-        get_crop(_x0,0,0,0,_x0,_height - 1,_depth - 1,_spectrum - 1).resize(_height,_depth,1,-100,-1).move_to(img_yz);
-      }
-      CImg<floatT> points(12,3,1,1,
-                          0,_width - 1,_width - 1,0,   0,_width - 1,_width - 1,0, _x0,_x0,_x0,_x0,
-                          0,0,_height - 1,_height - 1, _y0,_y0,_y0,_y0,       0,_height - 1,_height - 1,0,
-                          _z0,_z0,_z0,_z0,         0,0,_depth - 1,_depth - 1, 0,0,_depth - 1,_depth - 1);
-      primitives.assign();
-      CImg<tf>::vector(0,1,2,3,0,0,img_xy._width - 1,0,img_xy._width - 1,img_xy._height - 1,0,img_xy._height - 1).
-        move_to(primitives);
-      CImg<tf>::vector(4,5,6,7,0,0,img_xz._width - 1,0,img_xz._width - 1,img_xz._height - 1,0,img_xz._height - 1).
-        move_to(primitives);
-      CImg<tf>::vector(8,9,10,11,0,0,img_yz._width - 1,0,img_yz._width - 1,img_yz._height - 1,0,img_yz._height - 1).
-        move_to(primitives);
-      colors.assign();
-      img_xy.move_to(colors);
-      img_xz.move_to(colors);
-      img_yz.move_to(colors);
-      return points;
-    }
-
-    //! Generate a isoline of the image instance as a 3d object.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param isovalue The returned list of the 3d object colors.
-       \param size_x The number of subdivisions along the X-axis.
-       \param size_y The number of subdisivions along the Y-axis.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       const CImg<float> img("reference.jpg");
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = img.get_isoline3d(faces3d,100);
-       CImg<unsigned char>().display_object3d("Isoline3d",points3d,faces3d,colors3d);
-       \endcode
-       \image html ref_isoline3d.jpg
-    **/
-    template<typename tf>
-    CImg<floatT> get_isoline3d(CImgList<tf>& primitives, const float isovalue,
-                               const int size_x=-100, const int size_y=-100) const {
-      if (_spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "get_isoline3d(): Instance is not a scalar image.",
-                                    cimg_instance);
-      if (_depth>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "get_isoline3d(): Instance is not a 2d image.",
-                                    cimg_instance);
-      primitives.assign();
-      if (is_empty()) return *this;
-      CImg<floatT> vertices;
-      if ((size_x==-100 && size_y==-100) || (size_x==width() && size_y==height())) {
-        const _functor2d_int func(*this);
-        vertices = isoline3d(primitives,func,isovalue,0,0,width() - 1.0f,height() - 1.0f,width(),height());
-      } else {
-        const _functor2d_float func(*this);
-        vertices = isoline3d(primitives,func,isovalue,0,0,width() - 1.0f,height() - 1.0f,size_x,size_y);
-      }
-      return vertices;
-    }
-
-    //! Generate an isosurface of the image instance as a 3d object.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param isovalue The returned list of the 3d object colors.
-       \param size_x Number of subdivisions along the X-axis.
-       \param size_y Number of subdisivions along the Y-axis.
-       \param size_z Number of subdisivions along the Z-axis.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       const CImg<float> img = CImg<unsigned char>("reference.jpg").resize(-100,-100,20);
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = img.get_isosurface3d(faces3d,100);
-       CImg<unsigned char>().display_object3d("Isosurface3d",points3d,faces3d,colors3d);
-       \endcode
-       \image html ref_isosurface3d.jpg
-    **/
-    template<typename tf>
-    CImg<floatT> get_isosurface3d(CImgList<tf>& primitives, const float isovalue,
-                                  const int size_x=-100, const int size_y=-100, const int size_z=-100) const {
-      if (_spectrum>1)
-        throw CImgInstanceException(_cimg_instance
-                                    "get_isosurface3d(): Instance is not a scalar image.",
-                                    cimg_instance);
-      primitives.assign();
-      if (is_empty()) return *this;
-      CImg<floatT> vertices;
-      if ((size_x==-100 && size_y==-100 && size_z==-100) || (size_x==width() && size_y==height() && size_z==depth())) {
-        const _functor3d_int func(*this);
-        vertices = isosurface3d(primitives,func,isovalue,0,0,0,width() - 1.0f,height() - 1.0f,depth() - 1.0f,
-                                width(),height(),depth());
-      } else {
-        const _functor3d_float func(*this);
-        vertices = isosurface3d(primitives,func,isovalue,0,0,0,width() - 1.0f,height() - 1.0f,depth() - 1.0f,
-                                size_x,size_y,size_z);
-      }
-      return vertices;
-    }
-
-    //! Compute 3d elevation of a function as a 3d object.
-    /**
-       \param[out] primitives Primitives data of the resulting 3d object.
-       \param func Elevation function. Is of type <tt>float (*func)(const float x,const float y)</tt>.
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param size_x Resolution of the function along the X-axis.
-       \param size_y Resolution of the function along the Y-axis.
-    **/
-    template<typename tf, typename tfunc>
-    static CImg<floatT> elevation3d(CImgList<tf>& primitives, const tfunc& func,
-                                    const float x0, const float y0, const float x1, const float y1,
-                                    const int size_x=256, const int size_y=256) {
-      const float
-        nx0 = x0<x1?x0:x1, ny0 = y0<y1?y0:y1,
-        nx1 = x0<x1?x1:x0, ny1 = y0<y1?y1:y0;
-      const unsigned int
-        _nsize_x = (unsigned int)(size_x>=0?size_x:(nx1-nx0)*-size_x/100),
-        nsize_x = _nsize_x?_nsize_x:1, nsize_x1 = nsize_x - 1,
-        _nsize_y = (unsigned int)(size_y>=0?size_y:(ny1-ny0)*-size_y/100),
-        nsize_y = _nsize_y?_nsize_y:1, nsize_y1 = nsize_y - 1;
-      if (nsize_x<2 || nsize_y<2)
-        throw CImgArgumentException("CImg<%s>::elevation3d(): Invalid specified size (%d,%d).",
-                                    pixel_type(),
-                                    nsize_x,nsize_y);
-
-      CImg<floatT> vertices(nsize_x*nsize_y,3);
-      floatT *ptr_x = vertices.data(0,0), *ptr_y = vertices.data(0,1), *ptr_z = vertices.data(0,2);
-      for (unsigned int y = 0; y<nsize_y; ++y) {
-        const float Y = ny0 + y*(ny1-ny0)/nsize_y1;
-        for (unsigned int x = 0; x<nsize_x; ++x) {
-          const float X = nx0 + x*(nx1-nx0)/nsize_x1;
-          *(ptr_x++) = (float)x;
-          *(ptr_y++) = (float)y;
-          *(ptr_z++) = (float)func(X,Y);
-        }
-      }
-      primitives.assign(nsize_x1*nsize_y1,1,4);
-      for (unsigned int p = 0, y = 0; y<nsize_y1; ++y) {
-        const unsigned int yw = y*nsize_x;
-        for (unsigned int x = 0; x<nsize_x1; ++x) {
-          const unsigned int xpyw = x + yw, xpyww = xpyw + nsize_x;
-          primitives[p++].fill(xpyw,xpyww,xpyww + 1,xpyw + 1);
-        }
-      }
-      return vertices;
-    }
-
-    //! Compute 3d elevation of a function, as a 3d object \overloading.
-    template<typename tf>
-    static CImg<floatT> elevation3d(CImgList<tf>& primitives, const char *const expression,
-                                    const float x0, const float y0, const float x1, const float y1,
-                                    const int size_x=256, const int size_y=256) {
-      const _functor2d_expr func(expression);
-      return elevation3d(primitives,func,x0,y0,x1,y1,size_x,size_y);
-    }
-
-    //! Compute 0-isolines of a function, as a 3d object.
-    /**
-       \param[out] primitives Primitives data of the resulting 3d object.
-       \param func Elevation function. Is of type <tt>float (*func)(const float x,const float y)</tt>.
-       \param isovalue Isovalue to extract from function.
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param size_x Resolution of the function along the X-axis.
-       \param size_y Resolution of the function along the Y-axis.
-       \note Use the marching squares algorithm for extracting the isolines.
-     **/
-    template<typename tf, typename tfunc>
-    static CImg<floatT> isoline3d(CImgList<tf>& primitives, const tfunc& func, const float isovalue,
-                                  const float x0, const float y0, const float x1, const float y1,
-                                  const int size_x=256, const int size_y=256) {
-      static const unsigned int edges[16] = { 0x0, 0x9, 0x3, 0xa, 0x6, 0xf, 0x5, 0xc, 0xc,
-                                              0x5, 0xf, 0x6, 0xa, 0x3, 0x9, 0x0 };
-      static const int segments[16][4] = { { -1,-1,-1,-1 }, { 0,3,-1,-1 }, { 0,1,-1,-1 }, { 1,3,-1,-1 },
-                                           { 1,2,-1,-1 },   { 0,1,2,3 },   { 0,2,-1,-1 }, { 2,3,-1,-1 },
-                                           { 2,3,-1,-1 },   { 0,2,-1,-1},  { 0,3,1,2 },   { 1,2,-1,-1 },
-                                           { 1,3,-1,-1 },   { 0,1,-1,-1},  { 0,3,-1,-1},  { -1,-1,-1,-1 } };
-      const unsigned int
-        _nx = (unsigned int)(size_x>=0?size_x:cimg::round((x1-x0)*-size_x/100 + 1)),
-        _ny = (unsigned int)(size_y>=0?size_y:cimg::round((y1-y0)*-size_y/100 + 1)),
-        nx = _nx?_nx:1,
-        ny = _ny?_ny:1,
-        nxm1 = nx - 1,
-        nym1 = ny - 1;
-      primitives.assign();
-      if (!nxm1 || !nym1) return CImg<floatT>();
-      const float dx = (x1 - x0)/nxm1, dy = (y1 - y0)/nym1;
-      CImgList<floatT> vertices;
-      CImg<intT> indices1(nx,1,1,2,-1), indices2(nx,1,1,2);
-      CImg<floatT> values1(nx), values2(nx);
-      float X = x0, Y = y0, nX = X + dx, nY = Y + dy;
-
-      // Fill first line with values
-      cimg_forX(values1,x) { values1(x) = (float)func(X,Y); X+=dx; }
-
-      // Run the marching squares algorithm
-      for (unsigned int yi = 0, nyi = 1; yi<nym1; ++yi, ++nyi, Y=nY, nY+=dy) {
-        X = x0; nX = X + dx;
-        indices2.fill(-1);
-        for (unsigned int xi = 0, nxi = 1; xi<nxm1; ++xi, ++nxi, X=nX, nX+=dx) {
-
-          // Determine square configuration
-          const float
-            val0 = values1(xi),
-            val1 = values1(nxi),
-            val2 = values2(nxi) = (float)func(nX,nY),
-            val3 = values2(xi) = (float)func(X,nY);
-          const unsigned int
-            configuration = (val0<isovalue?1U:0U) | (val1<isovalue?2U:0U) |
-            (val2<isovalue?4U:0U) | (val3<isovalue?8U:0U),
-            edge = edges[configuration];
-
-          // Compute intersection vertices
-          if (edge) {
-            if ((edge&1) && indices1(xi,0)<0) {
-              const float Xi = X + (isovalue-val0)*dx/(val1-val0);
-              indices1(xi,0) = vertices.width();
-              CImg<floatT>::vector(Xi,Y,0).move_to(vertices);
-            }
-            if ((edge&2) && indices1(nxi,1)<0) {
-              const float Yi = Y + (isovalue-val1)*dy/(val2-val1);
-              indices1(nxi,1) = vertices.width();
-              CImg<floatT>::vector(nX,Yi,0).move_to(vertices);
-            }
-            if ((edge&4) && indices2(xi,0)<0) {
-              const float Xi = X + (isovalue-val3)*dx/(val2-val3);
-              indices2(xi,0) = vertices.width();
-              CImg<floatT>::vector(Xi,nY,0).move_to(vertices);
-            }
-            if ((edge&8) && indices1(xi,1)<0) {
-              const float Yi = Y + (isovalue-val0)*dy/(val3-val0);
-              indices1(xi,1) = vertices.width();
-              CImg<floatT>::vector(X,Yi,0).move_to(vertices);
-            }
-
-            // Create segments
-            for (const int *segment = segments[configuration]; *segment!=-1; ) {
-              const unsigned int p0 = (unsigned int)*(segment++), p1 = (unsigned int)*(segment++);
-              const tf
-                i0 = (tf)(_isoline3d_indice(p0,indices1,indices2,xi,nxi)),
-                i1 = (tf)(_isoline3d_indice(p1,indices1,indices2,xi,nxi));
-              CImg<tf>::vector(i0,i1).move_to(primitives);
-            }
-          }
-        }
-        values1.swap(values2);
-        indices1.swap(indices2);
-      }
-      return vertices>'x';
-    }
-
-    //! Compute isolines of a function, as a 3d object \overloading.
-    template<typename tf>
-    static CImg<floatT> isoline3d(CImgList<tf>& primitives, const char *const expression, const float isovalue,
-                                  const float x0, const float y0, const float x1, const float y1,
-                                  const int size_x=256, const int size_y=256) {
-      const _functor2d_expr func(expression);
-      return isoline3d(primitives,func,isovalue,x0,y0,x1,y1,size_x,size_y);
-    }
-
-    template<typename t>
-    static int _isoline3d_indice(const unsigned int edge, const CImg<t>& indices1, const CImg<t>& indices2,
-                                 const unsigned int x, const unsigned int nx) {
-      switch (edge) {
-      case 0 : return (int)indices1(x,0);
-      case 1 : return (int)indices1(nx,1);
-      case 2 : return (int)indices2(x,0);
-      case 3 : return (int)indices1(x,1);
-      }
-      return 0;
-    }
-
-    //! Compute isosurface of a function, as a 3d object.
-    /**
-       \param[out] primitives Primitives data of the resulting 3d object.
-       \param func Implicit function. Is of type <tt>float (*func)(const float x, const float y, const float z)</tt>.
-       \param isovalue Isovalue to extract.
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param z0 Z-coordinate of the starting point.
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param z1 Z-coordinate of the ending point.
-       \param size_x Resolution of the elevation function along the X-axis.
-       \param size_y Resolution of the elevation function along the Y-axis.
-       \param size_z Resolution of the elevation function along the Z-axis.
-       \note Use the marching cubes algorithm for extracting the isosurface.
-     **/
-    template<typename tf, typename tfunc>
-    static CImg<floatT> isosurface3d(CImgList<tf>& primitives, const tfunc& func, const float isovalue,
-                                     const float x0, const float y0, const float z0,
-                                     const float x1, const float y1, const float z1,
-                                     const int size_x=32, const int size_y=32, const int size_z=32) {
-      static const unsigned int edges[256] = {
-        0x000, 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c, 0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
-        0x190, 0x99 , 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c, 0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
-        0x230, 0x339, 0x33 , 0x13a, 0x636, 0x73f, 0x435, 0x53c, 0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
-        0x3a0, 0x2a9, 0x1a3, 0xaa , 0x7a6, 0x6af, 0x5a5, 0x4ac, 0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
-        0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c, 0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
-        0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0xff , 0x3f5, 0x2fc, 0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
-        0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x55 , 0x15c, 0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
-        0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0xcc , 0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
-        0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc, 0xcc , 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
-        0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c, 0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
-        0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc, 0x2fc, 0x3f5, 0xff , 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
-        0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c, 0x36c, 0x265, 0x16f, 0x66 , 0x76a, 0x663, 0x569, 0x460,
-        0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac, 0x4ac, 0x5a5, 0x6af, 0x7a6, 0xaa , 0x1a3, 0x2a9, 0x3a0,
-        0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c, 0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x33 , 0x339, 0x230,
-        0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c, 0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x99 , 0x190,
-        0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c, 0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x000
-      };
-
-      static const int triangles[256][16] = {
-        { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1 },
-        { 8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1 },
-        { 3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1 },
-        { 4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1 },
-        { 4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1 },
-        { 9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1 },
-        { 10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1 },
-        { 5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1 },
-        { 5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1 },
-        { 8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1 },
-        { 2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1 },
-        { 2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1 },
-        { 11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1 },
-        { 5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1 },
-        { 11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1 },
-        { 11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1 },
-        { 2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1 },
-        { 6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1 },
-        { 3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1 },
-        { 6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1 },
-        { 6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1 },
-        { 8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1 },
-        { 7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1 },
-        { 3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1 },
-        { 0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1 },
-        { 9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1 },
-        { 8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1 },
-        { 5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1 },
-        { 0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1 },
-        { 6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1 },
-        { 10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1 },
-        { 1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1 },
-        { 0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1 },
-        { 3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1 },
-        { 6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1 },
-        { 9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1 },
-        { 8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1 },
-        { 3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1 },
-        { 10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1 },
-        { 10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1 },
-        { 2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1 },
-        { 7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1 },
-        { 2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1 },
-        { 1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1 },
-        { 11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1 },
-        { 8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1 },
-        { 0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1 },
-        { 7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1 },
-        { 7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1 },
-        { 10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1 },
-        { 0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1 },
-        { 7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1 },
-        { 6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1 },
-        { 4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1 },
-        { 10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1 },
-        { 8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1 },
-        { 1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1 },
-        { 10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1 },
-        { 10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1 },
-        { 9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1 },
-        { 7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1 },
-        { 3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1 },
-        { 7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1 },
-        { 3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1 },
-        { 6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1 },
-        { 9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1 },
-        { 1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1 },
-        { 4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1 },
-        { 7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1 },
-        { 6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1 },
-        { 0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1 },
-        { 6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1 },
-        { 0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1 },
-        { 11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1 },
-        { 6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1 },
-        { 5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1 },
-        { 9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1 },
-        { 1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1 },
-        { 10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1 },
-        { 0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1 },
-        { 11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1 },
-        { 9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1 },
-        { 7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1 },
-        { 2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1 },
-        { 9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1 },
-        { 9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1 },
-        { 1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1 },
-        { 0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1 },
-        { 10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1 },
-        { 2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1 },
-        { 0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1 },
-        { 0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1 },
-        { 9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1 },
-        { 5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1 },
-        { 5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1 },
-        { 8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1 },
-        { 9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1 },
-        { 1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1 },
-        { 3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1 },
-        { 4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1 },
-        { 9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1 },
-        { 11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1 },
-        { 11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1 },
-        { 2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1 },
-        { 9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1 },
-        { 3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1 },
-        { 1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1 },
-        { 4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1 },
-        { 0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1 },
-        { 9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1 },
-        { 1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { 0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
-        { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }
-      };
-
-      const unsigned int
-        _nx = (unsigned int)(size_x>=0?size_x:cimg::round((x1-x0)*-size_x/100 + 1)),
-        _ny = (unsigned int)(size_y>=0?size_y:cimg::round((y1-y0)*-size_y/100 + 1)),
-        _nz = (unsigned int)(size_z>=0?size_z:cimg::round((z1-z0)*-size_z/100 + 1)),
-        nx = _nx?_nx:1,
-        ny = _ny?_ny:1,
-        nz = _nz?_nz:1,
-        nxm1 = nx - 1,
-        nym1 = ny - 1,
-        nzm1 = nz - 1;
-      primitives.assign();
-      if (!nxm1 || !nym1 || !nzm1) return CImg<floatT>();
-      const float dx = (x1 - x0)/nxm1, dy = (y1 - y0)/nym1, dz = (z1 - z0)/nzm1;
-      CImgList<floatT> vertices;
-      CImg<intT> indices1(nx,ny,1,3,-1), indices2(indices1);
-      CImg<floatT> values1(nx,ny), values2(nx,ny);
-      float X = 0, Y = 0, Z = 0, nX = 0, nY = 0, nZ = 0;
-
-      // Fill the first plane with function values
-      Y = y0;
-      cimg_forY(values1,y) {
-        X = x0;
-        cimg_forX(values1,x) { values1(x,y) = (float)func(X,Y,z0); X+=dx; }
-        Y+=dy;
-      }
-
-      // Run Marching Cubes algorithm
-      Z = z0; nZ = Z + dz;
-      for (unsigned int zi = 0; zi<nzm1; ++zi, Z = nZ, nZ+=dz) {
-        Y = y0; nY = Y + dy;
-        indices2.fill(-1);
-        for (unsigned int yi = 0, nyi = 1; yi<nym1; ++yi, ++nyi, Y = nY, nY+=dy) {
-          X = x0; nX = X + dx;
-          for (unsigned int xi = 0, nxi = 1; xi<nxm1; ++xi, ++nxi, X = nX, nX+=dx) {
-
-            // Determine cube configuration
-            const float
-              val0 = values1(xi,yi),
-              val1 = values1(nxi,yi),
-              val2 = values1(nxi,nyi),
-              val3 = values1(xi,nyi),
-              val4 = values2(xi,yi) = (float)func(X,Y,nZ),
-              val5 = values2(nxi,yi) = (float)func(nX,Y,nZ),
-              val6 = values2(nxi,nyi) = (float)func(nX,nY,nZ),
-              val7 = values2(xi,nyi) = (float)func(X,nY,nZ);
-
-            const unsigned int configuration =
-              (val0<isovalue?1U:0U)  | (val1<isovalue?2U:0U)  | (val2<isovalue?4U:0U)  | (val3<isovalue?8U:0U) |
-              (val4<isovalue?16U:0U) | (val5<isovalue?32U:0U) | (val6<isovalue?64U:0U) | (val7<isovalue?128U:0U),
-              edge = edges[configuration];
-
-            // Compute intersection vertices
-            if (edge) {
-              if ((edge&1) && indices1(xi,yi,0)<0) {
-                const float Xi = X + (isovalue-val0)*dx/(val1-val0);
-                indices1(xi,yi,0) = vertices.width();
-                CImg<floatT>::vector(Xi,Y,Z).move_to(vertices);
-              }
-              if ((edge&2) && indices1(nxi,yi,1)<0) {
-                const float Yi = Y + (isovalue-val1)*dy/(val2-val1);
-                indices1(nxi,yi,1) = vertices.width();
-                CImg<floatT>::vector(nX,Yi,Z).move_to(vertices);
-              }
-              if ((edge&4) && indices1(xi,nyi,0)<0) {
-                const float Xi = X + (isovalue-val3)*dx/(val2-val3);
-                indices1(xi,nyi,0) = vertices.width();
-                CImg<floatT>::vector(Xi,nY,Z).move_to(vertices);
-              }
-              if ((edge&8) && indices1(xi,yi,1)<0) {
-                const float Yi = Y + (isovalue-val0)*dy/(val3-val0);
-                indices1(xi,yi,1) = vertices.width();
-                CImg<floatT>::vector(X,Yi,Z).move_to(vertices);
-              }
-              if ((edge&16) && indices2(xi,yi,0)<0) {
-                const float Xi = X + (isovalue-val4)*dx/(val5-val4);
-                indices2(xi,yi,0) = vertices.width();
-                CImg<floatT>::vector(Xi,Y,nZ).move_to(vertices);
-              }
-              if ((edge&32) && indices2(nxi,yi,1)<0) {
-                const float Yi = Y + (isovalue-val5)*dy/(val6-val5);
-                indices2(nxi,yi,1) = vertices.width();
-                CImg<floatT>::vector(nX,Yi,nZ).move_to(vertices);
-              }
-              if ((edge&64) && indices2(xi,nyi,0)<0) {
-                const float Xi = X + (isovalue-val7)*dx/(val6-val7);
-                indices2(xi,nyi,0) = vertices.width();
-                CImg<floatT>::vector(Xi,nY,nZ).move_to(vertices);
-              }
-              if ((edge&128) && indices2(xi,yi,1)<0)  {
-                const float Yi = Y + (isovalue-val4)*dy/(val7-val4);
-                indices2(xi,yi,1) = vertices.width();
-                CImg<floatT>::vector(X,Yi,nZ).move_to(vertices);
-              }
-              if ((edge&256) && indices1(xi,yi,2)<0) {
-                const float Zi = Z+ (isovalue-val0)*dz/(val4-val0);
-                indices1(xi,yi,2) = vertices.width();
-                CImg<floatT>::vector(X,Y,Zi).move_to(vertices);
-              }
-              if ((edge&512) && indices1(nxi,yi,2)<0)  {
-                const float Zi = Z + (isovalue-val1)*dz/(val5-val1);
-                indices1(nxi,yi,2) = vertices.width();
-                CImg<floatT>::vector(nX,Y,Zi).move_to(vertices);
-              }
-              if ((edge&1024) && indices1(nxi,nyi,2)<0) {
-                const float Zi = Z + (isovalue-val2)*dz/(val6-val2);
-                indices1(nxi,nyi,2) = vertices.width();
-                CImg<floatT>::vector(nX,nY,Zi).move_to(vertices);
-              }
-              if ((edge&2048) && indices1(xi,nyi,2)<0) {
-                const float Zi = Z + (isovalue-val3)*dz/(val7-val3);
-                indices1(xi,nyi,2) = vertices.width();
-                CImg<floatT>::vector(X,nY,Zi).move_to(vertices);
-              }
-
-              // Create triangles
-              for (const int *triangle = triangles[configuration]; *triangle!=-1; ) {
-                const unsigned int
-                  p0 = (unsigned int)*(triangle++),
-                  p1 = (unsigned int)*(triangle++),
-                  p2 = (unsigned int)*(triangle++);
-                const tf
-                  i0 = (tf)(_isosurface3d_indice(p0,indices1,indices2,xi,yi,nxi,nyi)),
-                  i1 = (tf)(_isosurface3d_indice(p1,indices1,indices2,xi,yi,nxi,nyi)),
-                  i2 = (tf)(_isosurface3d_indice(p2,indices1,indices2,xi,yi,nxi,nyi));
-                CImg<tf>::vector(i0,i2,i1).move_to(primitives);
-              }
-            }
-          }
-        }
-        cimg::swap(values1,values2);
-        cimg::swap(indices1,indices2);
-      }
-      return vertices>'x';
-    }
-
-    //! Compute isosurface of a function, as a 3d object \overloading.
-    template<typename tf>
-    static CImg<floatT> isosurface3d(CImgList<tf>& primitives, const char *const expression, const float isovalue,
-                                     const float x0, const float y0, const float z0,
-                                     const float x1, const float y1, const float z1,
-                                     const int dx=32, const int dy=32, const int dz=32) {
-      const _functor3d_expr func(expression);
-      return isosurface3d(primitives,func,isovalue,x0,y0,z0,x1,y1,z1,dx,dy,dz);
-    }
-
-    template<typename t>
-    static int _isosurface3d_indice(const unsigned int edge, const CImg<t>& indices1, const CImg<t>& indices2,
-                                    const unsigned int x, const unsigned int y,
-                                    const unsigned int nx, const unsigned int ny) {
-      switch (edge) {
-      case 0 : return indices1(x,y,0);
-      case 1 : return indices1(nx,y,1);
-      case 2 : return indices1(x,ny,0);
-      case 3 : return indices1(x,y,1);
-      case 4 : return indices2(x,y,0);
-      case 5 : return indices2(nx,y,1);
-      case 6 : return indices2(x,ny,0);
-      case 7 : return indices2(x,y,1);
-      case 8 : return indices1(x,y,2);
-      case 9 : return indices1(nx,y,2);
-      case 10 : return indices1(nx,ny,2);
-      case 11 : return indices1(x,ny,2);
-      }
-      return 0;
-    }
-
-    // Define functors for accessing image values (used in previous functions).
-    struct _functor2d_int {
-      const CImg<T>& ref;
-      _functor2d_int(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y) const {
-        return (float)ref((int)x,(int)y);
-      }
-    };
-
-    struct _functor2d_float {
-      const CImg<T>& ref;
-      _functor2d_float(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y) const {
-        return (float)ref._linear_atXY(x,y);
-      }
-    };
-
-    struct _functor2d_expr {
-      _cimg_math_parser *mp;
-      ~_functor2d_expr() { mp->end(); delete mp; }
-      _functor2d_expr(const char *const expr):mp(0) {
-        mp = new _cimg_math_parser(expr,0,CImg<T>::const_empty(),0);
-      }
-      float operator()(const float x, const float y) const {
-        return (float)(*mp)(x,y,0,0);
-      }
-    };
-
-    struct _functor3d_int {
-      const CImg<T>& ref;
-      _functor3d_int(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y, const float z) const {
-        return (float)ref((int)x,(int)y,(int)z);
-      }
-    };
-
-    struct _functor3d_float {
-      const CImg<T>& ref;
-      _functor3d_float(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y, const float z) const {
-        return (float)ref._linear_atXYZ(x,y,z);
-      }
-    };
-
-    struct _functor3d_expr {
-      _cimg_math_parser *mp;
-      ~_functor3d_expr() { mp->end(); delete mp; }
-      _functor3d_expr(const char *const expr):mp(0) {
-        mp = new _cimg_math_parser(expr,0,CImg<T>::const_empty(),0);
-      }
-      float operator()(const float x, const float y, const float z) const {
-        return (float)(*mp)(x,y,z,0);
-      }
-    };
-
-    struct _functor4d_int {
-      const CImg<T>& ref;
-      _functor4d_int(const CImg<T>& pref):ref(pref) {}
-      float operator()(const float x, const float y, const float z, const unsigned int c) const {
-        return (float)ref((int)x,(int)y,(int)z,c);
-      }
-    };
-
-    //! Generate a 3d box object.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param size_x The width of the box (dimension along the X-axis).
-       \param size_y The height of the box (dimension along the Y-axis).
-       \param size_z The depth of the box (dimension along the Z-axis).
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::box3d(faces3d,10,20,30);
-       CImg<unsigned char>().display_object3d("Box3d",points3d,faces3d);
-       \endcode
-       \image html ref_box3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> box3d(CImgList<tf>& primitives,
-                              const float size_x=200, const float size_y=100, const float size_z=100) {
-      primitives.assign(6,1,4,1,1, 0,3,2,1, 4,5,6,7, 0,1,5,4, 3,7,6,2, 0,4,7,3, 1,2,6,5);
-      return CImg<floatT>(8,3,1,1,
-                          0.,size_x,size_x,    0.,    0.,size_x,size_x,    0.,
-                          0.,    0.,size_y,size_y,    0.,    0.,size_y,size_y,
-                          0.,    0.,    0.,    0.,size_z,size_z,size_z,size_z);
-    }
-
-    //! Generate a 3d cone.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param radius The radius of the cone basis.
-       \param size_z The cone's height.
-       \param subdivisions The number of basis angular subdivisions.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::cone3d(faces3d,50);
-       CImg<unsigned char>().display_object3d("Cone3d",points3d,faces3d);
-       \endcode
-       \image html ref_cone3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> cone3d(CImgList<tf>& primitives,
-                               const float radius=50, const float size_z=100, const unsigned int subdivisions=24) {
-      primitives.assign();
-      if (!subdivisions) return CImg<floatT>();
-      CImgList<floatT> vertices(2,1,3,1,1,
-                                0.,0.,size_z,
-                                0.,0.,0.);
-      for (float delta = 360.0f/subdivisions, angle = 0; angle<360; angle+=delta) {
-        const float a = (float)(angle*cimg::PI/180);
-        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),0).move_to(vertices);
-      }
-      const unsigned int nbr = vertices._width - 2;
-      for (unsigned int p = 0; p<nbr; ++p) {
-        const unsigned int curr = 2 + p, next = 2 + ((p + 1)%nbr);
-        CImg<tf>::vector(1,next,curr).move_to(primitives);
-        CImg<tf>::vector(0,curr,next).move_to(primitives);
-      }
-      return vertices>'x';
-    }
-
-    //! Generate a 3d cylinder.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param radius The radius of the cylinder basis.
-       \param size_z The cylinder's height.
-       \param subdivisions The number of basis angular subdivisions.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::cylinder3d(faces3d,50);
-       CImg<unsigned char>().display_object3d("Cylinder3d",points3d,faces3d);
-       \endcode
-       \image html ref_cylinder3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> cylinder3d(CImgList<tf>& primitives,
-                                   const float radius=50, const float size_z=100, const unsigned int subdivisions=24) {
-      primitives.assign();
-      if (!subdivisions) return CImg<floatT>();
-      CImgList<floatT> vertices(2,1,3,1,1,
-                                0.,0.,0.,
-                                0.,0.,size_z);
-      for (float delta = 360.0f/subdivisions, angle = 0; angle<360; angle+=delta) {
-        const float a = (float)(angle*cimg::PI/180);
-        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),0.0f).move_to(vertices);
-        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),size_z).move_to(vertices);
-      }
-      const unsigned int nbr = (vertices._width - 2)/2;
-      for (unsigned int p = 0; p<nbr; ++p) {
-        const unsigned int curr = 2 + 2*p, next = 2 + (2*((p + 1)%nbr));
-        CImg<tf>::vector(0,next,curr).move_to(primitives);
-        CImg<tf>::vector(1,curr + 1,next + 1).move_to(primitives);
-        CImg<tf>::vector(curr,next,next + 1,curr + 1).move_to(primitives);
-      }
-      return vertices>'x';
-    }
-
-    //! Generate a 3d torus.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param radius1 The large radius.
-       \param radius2 The small radius.
-       \param subdivisions1 The number of angular subdivisions for the large radius.
-       \param subdivisions2 The number of angular subdivisions for the small radius.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::torus3d(faces3d,20,4);
-       CImg<unsigned char>().display_object3d("Torus3d",points3d,faces3d);
-       \endcode
-       \image html ref_torus3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> torus3d(CImgList<tf>& primitives,
-                                const float radius1=100, const float radius2=30,
-                                const unsigned int subdivisions1=24, const unsigned int subdivisions2=12) {
-      primitives.assign();
-      if (!subdivisions1 || !subdivisions2) return CImg<floatT>();
-      CImgList<floatT> vertices;
-      for (unsigned int v = 0; v<subdivisions1; ++v) {
-        const float
-          beta = (float)(v*2*cimg::PI/subdivisions1),
-          xc = radius1*(float)std::cos(beta),
-          yc = radius1*(float)std::sin(beta);
-        for (unsigned int u = 0; u<subdivisions2; ++u) {
-          const float
-            alpha = (float)(u*2*cimg::PI/subdivisions2),
-            x = xc + radius2*(float)(std::cos(alpha)*std::cos(beta)),
-            y = yc + radius2*(float)(std::cos(alpha)*std::sin(beta)),
-            z = radius2*(float)std::sin(alpha);
-          CImg<floatT>::vector(x,y,z).move_to(vertices);
-        }
-      }
-      for (unsigned int vv = 0; vv<subdivisions1; ++vv) {
-        const unsigned int nv = (vv + 1)%subdivisions1;
-        for (unsigned int uu = 0; uu<subdivisions2; ++uu) {
-          const unsigned int nu = (uu + 1)%subdivisions2, svv = subdivisions2*vv, snv = subdivisions2*nv;
-          CImg<tf>::vector(svv + nu,svv + uu,snv + uu,snv + nu).move_to(primitives);
-        }
-      }
-      return vertices>'x';
-    }
-
-    //! Generate a 3d XY-plane.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param size_x The width of the plane (dimension along the X-axis).
-       \param size_y The height of the plane (dimensions along the Y-axis).
-       \param subdivisions_x The number of planar subdivisions along the X-axis.
-       \param subdivisions_y The number of planar subdivisions along the Y-axis.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::plane3d(faces3d,100,50);
-       CImg<unsigned char>().display_object3d("Plane3d",points3d,faces3d);
-       \endcode
-       \image html ref_plane3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> plane3d(CImgList<tf>& primitives,
-                                const float size_x=100, const float size_y=100,
-                                const unsigned int subdivisions_x=10, const unsigned int subdivisions_y=10) {
-      primitives.assign();
-      if (!subdivisions_x || !subdivisions_y) return CImg<floatT>();
-      CImgList<floatT> vertices;
-      const unsigned int w = subdivisions_x + 1, h = subdivisions_y + 1;
-      const float fx = (float)size_x/w, fy = (float)size_y/h;
-      for (unsigned int y = 0; y<h; ++y) for (unsigned int x = 0; x<w; ++x)
-        CImg<floatT>::vector(fx*x,fy*y,0).move_to(vertices);
-      for (unsigned int y = 0; y<subdivisions_y; ++y) for (unsigned int x = 0; x<subdivisions_x; ++x) {
-        const int off1 = x + y*w, off2 = x + 1 + y*w, off3 = x + 1 + (y + 1)*w, off4 = x + (y + 1)*w;
-        CImg<tf>::vector(off1,off4,off3,off2).move_to(primitives);
-      }
-      return vertices>'x';
-    }
-
-    //! Generate a 3d sphere.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param radius The radius of the sphere (dimension along the X-axis).
-       \param subdivisions The number of recursive subdivisions from an initial icosahedron.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> points3d = CImg<float>::sphere3d(faces3d,100,4);
-       CImg<unsigned char>().display_object3d("Sphere3d",points3d,faces3d);
-       \endcode
-       \image html ref_sphere3d.jpg
-    **/
-    template<typename tf>
-    static CImg<floatT> sphere3d(CImgList<tf>& primitives,
-                                 const float radius=50, const unsigned int subdivisions=3) {
-
-      // Create initial icosahedron
-      primitives.assign();
-      const double tmp = (1 + std::sqrt(5.0f))/2, a = 1.0/std::sqrt(1 + tmp*tmp), b = tmp*a;
-      CImgList<floatT> vertices(12,1,3,1,1, b,a,0.0, -b,a,0.0, -b,-a,0.0, b,-a,0.0, a,0.0,b, a,0.0,-b,
-                                -a,0.0,-b, -a,0.0,b, 0.0,b,a, 0.0,-b,a, 0.0,-b,-a, 0.0,b,-a);
-      primitives.assign(20,1,3,1,1, 4,8,7, 4,7,9, 5,6,11, 5,10,6, 0,4,3, 0,3,5, 2,7,1, 2,1,6,
-                        8,0,11, 8,11,1, 9,10,3, 9,2,10, 8,4,0, 11,0,5, 4,9,3,
-                        5,3,10, 7,8,1, 6,1,11, 7,2,9, 6,10,2);
-      // edge - length/2
-      float he = (float)a;
-
-      // Recurse subdivisions
-      for (unsigned int i = 0; i<subdivisions; ++i) {
-        const unsigned int L = primitives._width;
-        he/=2;
-        const float he2 = he*he;
-        for (unsigned int l = 0; l<L; ++l) {
-          const unsigned int
-            p0 = (unsigned int)primitives(0,0), p1 = (unsigned int)primitives(0,1), p2 = (unsigned int)primitives(0,2);
-          const float
-            x0 = vertices(p0,0), y0 = vertices(p0,1), z0 = vertices(p0,2),
-            x1 = vertices(p1,0), y1 = vertices(p1,1), z1 = vertices(p1,2),
-            x2 = vertices(p2,0), y2 = vertices(p2,1), z2 = vertices(p2,2),
-            tnx0 = (x0 + x1)/2, tny0 = (y0 + y1)/2, tnz0 = (z0 + z1)/2,
-            nn0 = cimg::hypot(tnx0,tny0,tnz0),
-            tnx1 = (x0 + x2)/2, tny1 = (y0 + y2)/2, tnz1 = (z0 + z2)/2,
-            nn1 = cimg::hypot(tnx1,tny1,tnz1),
-            tnx2 = (x1 + x2)/2, tny2 = (y1 + y2)/2, tnz2 = (z1 + z2)/2,
-            nn2 = cimg::hypot(tnx2,tny2,tnz2),
-            nx0 = tnx0/nn0, ny0 = tny0/nn0, nz0 = tnz0/nn0,
-            nx1 = tnx1/nn1, ny1 = tny1/nn1, nz1 = tnz1/nn1,
-            nx2 = tnx2/nn2, ny2 = tny2/nn2, nz2 = tnz2/nn2;
-          int i0 = -1, i1 = -1, i2 = -1;
-          cimglist_for(vertices,p) {
-            const float x = (float)vertices(p,0), y = (float)vertices(p,1), z = (float)vertices(p,2);
-            if (cimg::sqr(x-nx0) + cimg::sqr(y-ny0) + cimg::sqr(z-nz0)<he2) i0 = p;
-            if (cimg::sqr(x-nx1) + cimg::sqr(y-ny1) + cimg::sqr(z-nz1)<he2) i1 = p;
-            if (cimg::sqr(x-nx2) + cimg::sqr(y-ny2) + cimg::sqr(z-nz2)<he2) i2 = p;
-          }
-          if (i0<0) { CImg<floatT>::vector(nx0,ny0,nz0).move_to(vertices); i0 = vertices.width() - 1; }
-          if (i1<0) { CImg<floatT>::vector(nx1,ny1,nz1).move_to(vertices); i1 = vertices.width() - 1; }
-          if (i2<0) { CImg<floatT>::vector(nx2,ny2,nz2).move_to(vertices); i2 = vertices.width() - 1; }
-          primitives.remove(0);
-          CImg<tf>::vector(p0,i0,i1).move_to(primitives);
-          CImg<tf>::vector((tf)i0,(tf)p1,(tf)i2).move_to(primitives);
-          CImg<tf>::vector((tf)i1,(tf)i2,(tf)p2).move_to(primitives);
-          CImg<tf>::vector((tf)i1,(tf)i0,(tf)i2).move_to(primitives);
-        }
-      }
-      return (vertices>'x')*=radius;
-    }
-
-    //! Generate a 3d ellipsoid.
-    /**
-       \param[out] primitives The returned list of the 3d object primitives
-                              (template type \e tf should be at least \e unsigned \e int).
-       \param tensor The tensor which gives the shape and size of the ellipsoid.
-       \param subdivisions The number of recursive subdivisions from an initial stretched icosahedron.
-       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N - 1).
-       \par Example
-       \code
-       CImgList<unsigned int> faces3d;
-       const CImg<float> tensor = CImg<float>::diagonal(10,7,3),
-                         points3d = CImg<float>::ellipsoid3d(faces3d,tensor,4);
-       CImg<unsigned char>().display_object3d("Ellipsoid3d",points3d,faces3d);
-       \endcode
-       \image html ref_ellipsoid3d.jpg
-    **/
-    template<typename tf, typename t>
-    static CImg<floatT> ellipsoid3d(CImgList<tf>& primitives,
-                                    const CImg<t>& tensor, const unsigned int subdivisions=3) {
-      primitives.assign();
-      if (!subdivisions) return CImg<floatT>();
-      CImg<floatT> S, V;
-      tensor.symmetric_eigen(S,V);
-      const float orient =
-        (V(0,1)*V(1,2) - V(0,2)*V(1,1))*V(2,0) +
-        (V(0,2)*V(1,0) - V(0,0)*V(1,2))*V(2,1) +
-        (V(0,0)*V(1,1) - V(0,1)*V(1,0))*V(2,2);
-      if (orient<0) { V(2,0) = -V(2,0); V(2,1) = -V(2,1); V(2,2) = -V(2,2); }
-      const float l0 = S[0], l1 = S[1], l2 = S[2];
-      CImg<floatT> vertices = sphere3d(primitives,1.0,subdivisions);
-      vertices.get_shared_row(0)*=l0;
-      vertices.get_shared_row(1)*=l1;
-      vertices.get_shared_row(2)*=l2;
-      return V*vertices;
-    }
-
-    //! Convert 3d object into a CImg3d representation.
-    /**
-       \param primitives Primitives data of the 3d object.
-       \param colors Colors data of the 3d object.
-       \param opacities Opacities data of the 3d object.
-       \param full_check Tells if full checking of the 3d object must be performed.
-    **/
-    template<typename tp, typename tc, typename to>
-    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives,
-                              const CImgList<tc>& colors,
-                              const to& opacities,
-                              const bool full_check=true) {
-      return get_object3dtoCImg3d(primitives,colors,opacities,full_check).move_to(*this);
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    template<typename tp, typename tc>
-    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives,
-                              const CImgList<tc>& colors,
-                              const bool full_check=true) {
-      return get_object3dtoCImg3d(primitives,colors,full_check).move_to(*this);
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    template<typename tp>
-    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives,
-                              const bool full_check=true) {
-      return get_object3dtoCImg3d(primitives,full_check).move_to(*this);
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    CImg<T>& object3dtoCImg3d(const bool full_check=true) {
-      return get_object3dtoCImg3d(full_check).move_to(*this);
-    }
-
-    //! Convert 3d object into a CImg3d representation \newinstance.
-    template<typename tp, typename tc, typename to>
-    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives,
-                                      const CImgList<tc>& colors,
-                                      const to& opacities,
-                                      const bool full_check=true) const {
-      CImg<charT> error_message(1024);
-      if (!is_object3d(primitives,colors,opacities,full_check,error_message))
-        throw CImgInstanceException(_cimg_instance
-                                    "object3dtoCImg3d(): Invalid specified 3d object (%u,%u) (%s).",
-                                    cimg_instance,_width,primitives._width,error_message.data());
-      CImg<floatT> res(1,_size_object3dtoCImg3d(primitives,colors,opacities));
-      float *ptrd = res._data;
-
-      // Put magick number.
-      *(ptrd++) = 'C' + 0.5f; *(ptrd++) = 'I' + 0.5f; *(ptrd++) = 'm' + 0.5f;
-      *(ptrd++) = 'g' + 0.5f; *(ptrd++) = '3' + 0.5f; *(ptrd++) = 'd' + 0.5f;
-
-      // Put number of vertices and primitives.
-      *(ptrd++) = cimg::uint2float(_width);
-      *(ptrd++) = cimg::uint2float(primitives._width);
-
-      // Put vertex data.
-      if (is_empty() || !primitives) return res;
-      const T *ptrx = data(0,0), *ptry = data(0,1), *ptrz = data(0,2);
-      cimg_forX(*this,p) {
-        *(ptrd++) = (float)*(ptrx++);
-        *(ptrd++) = (float)*(ptry++);
-        *(ptrd++) = (float)*(ptrz++);
-      }
-
-      // Put primitive data.
-      cimglist_for(primitives,p) {
-        *(ptrd++) = (float)primitives[p].size();
-        const tp *ptrp = primitives[p]._data;
-        cimg_foroff(primitives[p],i) *(ptrd++) = cimg::uint2float((unsigned int)*(ptrp++));
-      }
-
-      // Put color/texture data.
-      const unsigned int csiz = std::min(colors._width,primitives._width);
-      for (int c = 0; c<(int)csiz; ++c) {
-        const CImg<tc>& color = colors[c];
-        const tc *ptrc = color._data;
-        if (color.size()==3) { *(ptrd++) = (float)*(ptrc++); *(ptrd++) = (float)*(ptrc++); *(ptrd++) = (float)*ptrc; }
-        else {
-          *(ptrd++) = -128.0f;
-          int shared_ind = -1;
-          if (color.is_shared()) for (int i = 0; i<c; ++i) if (ptrc==colors[i]._data) { shared_ind = i; break; }
-          if (shared_ind<0) {
-            *(ptrd++) = (float)color._width;
-            *(ptrd++) = (float)color._height;
-            *(ptrd++) = (float)color._spectrum;
-            cimg_foroff(color,l) *(ptrd++) = (float)*(ptrc++);
-          } else {
-            *(ptrd++) = (float)shared_ind;
-            *(ptrd++) = 0;
-            *(ptrd++) = 0;
-          }
-        }
-      }
-      const int csiz2 = primitives.width() - colors.width();
-      for (int c = 0; c<csiz2; ++c) { *(ptrd++) = 200.0f; *(ptrd++) = 200.0f; *(ptrd++) = 200.0f; }
-
-      // Put opacity data.
-      ptrd = _object3dtoCImg3d(opacities,ptrd);
-      const float *ptre = res.end();
-      while (ptrd<ptre) *(ptrd++) = 1.0f;
-      return res;
-    }
-
-    template<typename to>
-    float* _object3dtoCImg3d(const CImgList<to>& opacities, float *ptrd) const {
-      cimglist_for(opacities,o) {
-        const CImg<to>& opacity = opacities[o];
-        const to *ptro = opacity._data;
-        if (opacity.size()==1) *(ptrd++) = (float)*ptro;
-        else {
-          *(ptrd++) = -128.0f;
-          int shared_ind = -1;
-          if (opacity.is_shared()) for (int i = 0; i<o; ++i) if (ptro==opacities[i]._data) { shared_ind = i; break; }
-          if (shared_ind<0) {
-            *(ptrd++) = (float)opacity._width;
-            *(ptrd++) = (float)opacity._height;
-            *(ptrd++) = (float)opacity._spectrum;
-            cimg_foroff(opacity,l) *(ptrd++) = (float)*(ptro++);
-          } else {
-            *(ptrd++) = (float)shared_ind;
-            *(ptrd++) = 0;
-            *(ptrd++) = 0;
-          }
-        }
-      }
-      return ptrd;
-    }
-
-    template<typename to>
-    float* _object3dtoCImg3d(const CImg<to>& opacities, float *ptrd) const {
-      const to *ptro = opacities._data;
-      cimg_foroff(opacities,o) *(ptrd++) = (float)*(ptro++);
-      return ptrd;
-    }
-
-    template<typename tp, typename tc, typename to>
-    unsigned int _size_object3dtoCImg3d(const CImgList<tp>& primitives,
-                                        const CImgList<tc>& colors,
-                                        const CImgList<to>& opacities) const {
-      unsigned int siz = 8U + 3*_width;
-      cimglist_for(primitives,p) siz+=primitives[p].size() + 1;
-      for (int c = std::min(primitives.width(),colors.width()) - 1; c>=0; --c) {
-        if (colors[c].is_shared()) siz+=4;
-        else { const unsigned int csiz = colors[c].size(); siz+=(csiz!=3)?4 + csiz:3; }
-      }
-      if (colors._width<primitives._width) siz+=3*(primitives._width - colors._width);
-      cimglist_for(opacities,o) {
-        if (opacities[o].is_shared()) siz+=4;
-        else { const unsigned int osiz = opacities[o].size(); siz+=(osiz!=1)?4 + osiz:1; }
-      }
-      siz+=primitives._width - opacities._width;
-      return siz;
-    }
-
-    template<typename tp, typename tc, typename to>
-    unsigned int _size_object3dtoCImg3d(const CImgList<tp>& primitives,
-                                        const CImgList<tc>& colors,
-                                        const CImg<to>& opacities) const {
-      unsigned int siz = 8U + 3*_width;
-      cimglist_for(primitives,p) siz+=primitives[p].size() + 1;
-      for (int c = std::min(primitives.width(),colors.width()) - 1; c>=0; --c) {
-        const unsigned int csiz = colors[c].size(); siz+=(csiz!=3)?4 + csiz:3;
-      }
-      if (colors._width<primitives._width) siz+=3*(primitives._width - colors._width);
-      siz+=primitives.size();
-      cimg::unused(opacities);
-      return siz;
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    template<typename tp, typename tc>
-    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives,
-                                      const CImgList<tc>& colors,
-                                      const bool full_check=true) const {
-      CImgList<T> opacities;
-      return get_object3dtoCImg3d(primitives,colors,opacities,full_check);
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    template<typename tp>
-    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives,
-                                      const bool full_check=true) const {
-      CImgList<T> colors, opacities;
-      return get_object3dtoCImg3d(primitives,colors,opacities,full_check);
-    }
-
-    //! Convert 3d object into a CImg3d representation \overloading.
-    CImg<floatT> get_object3dtoCImg3d(const bool full_check=true) const {
-      CImgList<T> opacities, colors;
-      CImgList<uintT> primitives(width(),1,1,1,1);
-      cimglist_for(primitives,p) primitives(p,0) = p;
-      return get_object3dtoCImg3d(primitives,colors,opacities,full_check);
-    }
-
-    //! Convert CImg3d representation into a 3d object.
-    /**
-       \param[out] primitives Primitives data of the 3d object.
-       \param[out] colors Colors data of the 3d object.
-       \param[out] opacities Opacities data of the 3d object.
-       \param full_check Tells if full checking of the 3d object must be performed.
-    **/
-    template<typename tp, typename tc, typename to>
-    CImg<T>& CImg3dtoobject3d(CImgList<tp>& primitives,
-                              CImgList<tc>& colors,
-                              CImgList<to>& opacities,
-                              const bool full_check=true) {
-      return get_CImg3dtoobject3d(primitives,colors,opacities,full_check).move_to(*this);
-    }
-
-    //! Convert CImg3d representation into a 3d object \newinstance.
-    template<typename tp, typename tc, typename to>
-    CImg<T> get_CImg3dtoobject3d(CImgList<tp>& primitives,
-                                 CImgList<tc>& colors,
-                                 CImgList<to>& opacities,
-                                 const bool full_check=true) const {
-      CImg<charT> error_message(1024);
-      if (!is_CImg3d(full_check,error_message))
-        throw CImgInstanceException(_cimg_instance
-                                    "CImg3dtoobject3d(): image instance is not a CImg3d (%s).",
-                                    cimg_instance,error_message.data());
-      const T *ptrs = _data + 6;
-      const unsigned int
-        nb_points = cimg::float2uint((float)*(ptrs++)),
-        nb_primitives = cimg::float2uint((float)*(ptrs++));
-      const CImg<T> points = CImg<T>(ptrs,3,nb_points,1,1,true).get_transpose();
-      ptrs+=3*nb_points;
-      primitives.assign(nb_primitives);
-      cimglist_for(primitives,p) {
-        const unsigned int nb_inds = (unsigned int)*(ptrs++);
-        primitives[p].assign(1,nb_inds);
-        tp *ptrp = primitives[p]._data;
-        for (unsigned int i = 0; i<nb_inds; ++i) *(ptrp++) = (tp)cimg::float2uint((float)*(ptrs++));
-      }
-      colors.assign(nb_primitives);
-      cimglist_for(colors,c) {
-        if (*ptrs==(T)-128) {
-          ++ptrs;
-          const unsigned int w = (unsigned int)*(ptrs++), h = (unsigned int)*(ptrs++), s = (unsigned int)*(ptrs++);
-          if (!h && !s) colors[c].assign(colors[w],true);
-          else { colors[c].assign(ptrs,w,h,1,s,false); ptrs+=w*h*s; }
-        } else { colors[c].assign(ptrs,1,1,1,3,false); ptrs+=3; }
-      }
-      opacities.assign(nb_primitives);
-      cimglist_for(opacities,o) {
-        if (*ptrs==(T)-128) {
-          ++ptrs;
-          const unsigned int w = (unsigned int)*(ptrs++), h = (unsigned int)*(ptrs++), s = (unsigned int)*(ptrs++);
-          if (!h && !s) opacities[o].assign(opacities[w],true);
-          else { opacities[o].assign(ptrs,w,h,1,s,false); ptrs+=w*h*s; }
-        } else opacities[o].assign(1,1,1,1,*(ptrs++));
-      }
-      return points;
-    }
-
-    //@}
-    //---------------------------
-    //
-    //! \name Drawing Functions
-    //@{
-    //---------------------------
-
-#define cimg_init_scanline(color,opacity) \
-    const float _sc_nopacity = cimg::abs((float)opacity), _sc_copacity = 1 - std::max((float)opacity,0.0f); \
-    const ulongT _sc_whd = (ulongT)_width*_height*_depth
-
-#define cimg_draw_scanline(x0,x1,y,color,opacity,brightness) \
-    _draw_scanline(x0,x1,y,color,opacity,brightness,_sc_nopacity,_sc_copacity,_sc_whd)
-
-    // [internal] The following _draw_scanline() routines are *non user-friendly functions*,
-    // used only for internal purpose.
-    // Pre-requisites: x0<=x1, y-coordinate is valid, col is valid.
-    template<typename tc>
-    CImg<T>& _draw_scanline(const int x0, const int x1, const int y,
-                            const tc *const color, const float opacity,
-                            const float brightness,
-                            const float nopacity, const float copacity, const ulongT whd) {
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const int nx0 = x0>0?x0:0, nx1 = x1<width()?x1:width() - 1, dx = nx1 - nx0;
-      if (dx>=0) {
-        const tc *col = color;
-        const ulongT off = whd - dx - 1;
-        T *ptrd = data(nx0,y);
-        if (opacity>=1) { // ** Opaque drawing **
-          if (brightness==1) { // Brightness==1
-            if (sizeof(T)!=1) cimg_forC(*this,c) {
-                const T val = (T)*(col++);
-                for (int x = dx; x>=0; --x) *(ptrd++) = val;
-                ptrd+=off;
-              } else cimg_forC(*this,c) {
-                const T val = (T)*(col++);
-                std::memset(ptrd,(int)val,dx + 1);
-                ptrd+=whd;
-              }
-          } else if (brightness<1) { // Brightness<1
-            if (sizeof(T)!=1) cimg_forC(*this,c) {
-                const T val = (T)(*(col++)*brightness);
-                for (int x = dx; x>=0; --x) *(ptrd++) = val;
-                ptrd+=off;
-              } else cimg_forC(*this,c) {
-                const T val = (T)(*(col++)*brightness);
-                std::memset(ptrd,(int)val,dx + 1);
-                ptrd+=whd;
-              }
-          } else { // Brightness>1
-            if (sizeof(T)!=1) cimg_forC(*this,c) {
-                const T val = (T)((2-brightness)**(col++) + (brightness - 1)*maxval);
-                for (int x = dx; x>=0; --x) *(ptrd++) = val;
-                ptrd+=off;
-              } else cimg_forC(*this,c) {
-                const T val = (T)((2-brightness)**(col++) + (brightness - 1)*maxval);
-                std::memset(ptrd,(int)val,dx + 1);
-                ptrd+=whd;
-              }
-          }
-        } else { // ** Transparent drawing **
-          if (brightness==1) { // Brightness==1
-            cimg_forC(*this,c) {
-              const Tfloat val = *(col++)*nopacity;
-              for (int x = dx; x>=0; --x) { *ptrd = (T)(val + *ptrd*copacity); ++ptrd; }
-              ptrd+=off;
-            }
-          } else if (brightness<=1) { // Brightness<1
-            cimg_forC(*this,c) {
-              const Tfloat val = *(col++)*brightness*nopacity;
-              for (int x = dx; x>=0; --x) { *ptrd = (T)(val + *ptrd*copacity); ++ptrd; }
-              ptrd+=off;
-            }
-          } else { // Brightness>1
-            cimg_forC(*this,c) {
-              const Tfloat val = ((2-brightness)**(col++) + (brightness - 1)*maxval)*nopacity;
-              for (int x = dx; x>=0; --x) { *ptrd = (T)(val + *ptrd*copacity); ++ptrd; }
-              ptrd+=off;
-            }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a 3d point.
-    /**
-       \param x0 X-coordinate of the point.
-       \param y0 Y-coordinate of the point.
-       \param z0 Z-coordinate of the point.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \note
-       - To set pixel values without clipping needs, you should use the faster CImg::operator()() function.
-       \par Example:
-       \code
-       CImg<unsigned char> img(100,100,1,3,0);
-       const unsigned char color[] = { 255,128,64 };
-       img.draw_point(50,50,color);
-       \endcode
-    **/
-    template<typename tc>
-    CImg<T>& draw_point(const int x0, const int y0, const int z0,
-                        const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_point(): Specified color is (null).",
-                                    cimg_instance);
-      if (x0>=0 && y0>=0 && z0>=0 && x0<width() && y0<height() && z0<depth()) {
-        const ulongT whd = (ulongT)_width*_height*_depth;
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        T *ptrd = data(x0,y0,z0,0);
-        const tc *col = color;
-        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
-        else cimg_forC(*this,c) { *ptrd = (T)(*(col++)*nopacity + *ptrd*copacity); ptrd+=whd; }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d point \simplification.
-    template<typename tc>
-    CImg<T>& draw_point(const int x0, const int y0,
-                        const tc *const color, const float opacity=1) {
-      return draw_point(x0,y0,0,color,opacity);
-    }
-
-    // Draw a points cloud.
-    /**
-       \param points Image of vertices coordinates.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_point(const CImg<t>& points,
-                        const tc *const color, const float opacity=1) {
-      if (is_empty() || !points) return *this;
-      switch (points._height) {
-      case 0 : case 1 :
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_point(): Invalid specified point set (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    points._width,points._height,points._depth,points._spectrum,points._data);
-      case 2 : {
-        cimg_forX(points,i) draw_point((int)points(i,0),(int)points(i,1),color,opacity);
-      } break;
-      default : {
-        cimg_forX(points,i) draw_point((int)points(i,0),(int)points(i,1),(int)points(i,2),color,opacity);
-      }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d line.
-    /**
-       \param x0 X-coordinate of the starting line point.
-       \param y0 Y-coordinate of the starting line point.
-       \param x1 X-coordinate of the ending line point.
-       \param y1 Y-coordinate of the ending line point.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if a reinitialization of the hash state must be done.
-       \note
-       - Line routine uses Bresenham's algorithm.
-       - Set \p init_hatch = false to draw consecutive hatched segments without breaking the line pattern.
-       \par Example:
-       \code
-       CImg<unsigned char> img(100,100,1,3,0);
-       const unsigned char color[] = { 255,128,64 };
-        img.draw_line(40,40,80,70,color);
-       \endcode
-    **/
-    template<typename tc>
-    CImg<T>& draw_line(const int x0, const int y0,
-                       const int x1, const int y1,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Specified color is (null).",
-                                    cimg_instance);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      const bool xdir = x0<x1, ydir = y0<y1;
-      int
-        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
-        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
-        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
-        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
-        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
-      if (xright<0 || xleft>=width()) return *this;
-      if (xleft<0) { yleft-=(int)((float)xleft*((float)yright - yleft)/((float)xright - xleft)); xleft = 0; }
-      if (xright>=width()) {
-        yright-=(int)(((float)xright - width())*((float)yright - yleft)/((float)xright - xleft));
-        xright = width() - 1;
-      }
-      if (ydown<0 || yup>=height()) return *this;
-      if (yup<0) { xup-=(int)((float)yup*((float)xdown - xup)/((float)ydown - yup)); yup = 0; }
-      if (ydown>=height()) {
-        xdown-=(int)(((float)ydown - height())*((float)xdown - xup)/((float)ydown - yup));
-        ydown = height() - 1;
-      }
-      T *ptrd0 = data(nx0,ny0);
-      int dx = xright - xleft, dy = ydown - yup;
-      const bool steep = dy>dx;
-      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
-      const longT
-        offx = (longT)(nx0<nx1?1:-1)*(steep?width():1),
-        offy = (longT)(ny0<ny1?1:-1)*(steep?1:width());
-      const ulongT wh = (ulongT)_width*_height;
-      if (opacity>=1) {
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            T *ptrd = ptrd0; const tc* col = color;
-            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          T *ptrd = ptrd0; const tc* col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            T *ptrd = ptrd0; const tc* col = color;
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          T *ptrd = ptrd0; const tc* col = color;
-          cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d line, with z-buffering.
-    /**
-       \param zbuffer Zbuffer image.
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param z0 Z-coordinate of the starting point
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param z1 Z-coordinate of the ending point.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if a reinitialization of the hash state must be done.
-    **/
-    template<typename tz,typename tc>
-    CImg<T>& draw_line(CImg<tz>& zbuffer,
-                       const int x0, const int y0, const float z0,
-                       const int x1, const int y1, const float z1,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Specified color is (null).",
-                                    cimg_instance);
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      const bool xdir = x0<x1, ydir = y0<y1;
-      int
-        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
-        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
-        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
-        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
-        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
-      tzfloat
-        Z0 = 1/(tzfloat)z0, Z1 = 1/(tzfloat)z1, nz0 = Z0, nz1 = Z1, dz = Z1 - Z0,
-        &zleft = xdir?nz0:nz1,
-        &zright = xdir?nz1:nz0,
-        &zup = ydir?nz0:nz1,
-        &zdown = ydir?nz1:nz0;
-      if (xright<0 || xleft>=width()) return *this;
-      if (xleft<0) {
-        const float D = (float)xright - xleft;
-        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
-        zleft-=(tzfloat)xleft*(zright - zleft)/D;
-        xleft = 0;
-      }
-      if (xright>=width()) {
-        const float d = (float)xright - width(), D = (float)xright - xleft;
-        yright-=(int)(d*((float)yright - yleft)/D);
-        zright-=(tzfloat)d*(zright - zleft)/D;
-        xright = width() - 1;
-      }
-      if (ydown<0 || yup>=height()) return *this;
-      if (yup<0) {
-        const float D = (float)ydown - yup;
-        xup-=(int)((float)yup*((float)xdown - xup)/D);
-        zup-=(tzfloat)yup*(zdown - zup)/D;
-        yup = 0;
-      }
-      if (ydown>=height()) {
-        const float d = (float)ydown - height(), D = (float)ydown - yup;
-        xdown-=(int)(d*((float)xdown - xup)/D);
-        zdown-=(tzfloat)d*(zdown - zup)/D;
-        ydown = height() - 1;
-      }
-      T *ptrd0 = data(nx0,ny0);
-      tz *ptrz = zbuffer.data(nx0,ny0);
-      int dx = xright - xleft, dy = ydown - yup;
-      const bool steep = dy>dx;
-      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
-      const longT
-        offx = (longT)(nx0<nx1?1:-1)*(steep?width():1),
-        offy = (longT)(ny0<ny1?1:-1)*(steep?1:width());
-      const ulongT
-        wh = (ulongT)_width*_height,
-        ndx = (ulongT)(dx>0?dx:1);
-      if (opacity>=1) {
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz && pattern&hatch) {
-            *ptrz = (tz)z;
-            T *ptrd = ptrd0; const tc *col = color;
-            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz) {
-            *ptrz = (tz)z;
-            T *ptrd = ptrd0; const tc *col = color;
-            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
-          }
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz && pattern&hatch) {
-            *ptrz = (tz)z;
-            T *ptrd = ptrd0; const tc *col = color;
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz) {
-            *ptrz = (tz)z;
-            T *ptrd = ptrd0; const tc *col = color;
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
-          }
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a 3d line.
-    /**
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param z0 Z-coordinate of the starting point
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param z1 Z-coordinate of the ending point.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if a reinitialization of the hash state must be done.
-    **/
-    template<typename tc>
-    CImg<T>& draw_line(const int x0, const int y0, const int z0,
-                       const int x1, const int y1, const int z1,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Specified color is (null).",
-                                    cimg_instance);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      int nx0 = x0, ny0 = y0, nz0 = z0, nx1 = x1, ny1 = y1, nz1 = z1;
-      if (nx0>nx1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
-      if (nx1<0 || nx0>=width()) return *this;
-      if (nx0<0) {
-        const float D = 1.0f + nx1 - nx0;
-        ny0-=(int)((float)nx0*(1.0f + ny1 - ny0)/D);
-        nz0-=(int)((float)nx0*(1.0f + nz1 - nz0)/D);
-        nx0 = 0;
-      }
-      if (nx1>=width()) {
-        const float d = (float)nx1 - width(), D = 1.0f + nx1 - nx0;
-        ny1+=(int)(d*(1.0f + ny0 - ny1)/D);
-        nz1+=(int)(d*(1.0f + nz0 - nz1)/D);
-        nx1 = width() - 1;
-      }
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
-      if (ny1<0 || ny0>=height()) return *this;
-      if (ny0<0) {
-        const float D = 1.0f + ny1 - ny0;
-        nx0-=(int)((float)ny0*(1.0f + nx1 - nx0)/D);
-        nz0-=(int)((float)ny0*(1.0f + nz1 - nz0)/D);
-        ny0 = 0;
-      }
-      if (ny1>=height()) {
-        const float d = (float)ny1 - height(), D = 1.0f + ny1 - ny0;
-        nx1+=(int)(d*(1.0f + nx0 - nx1)/D);
-        nz1+=(int)(d*(1.0f + nz0 - nz1)/D);
-        ny1 = height() - 1;
-      }
-      if (nz0>nz1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
-      if (nz1<0 || nz0>=depth()) return *this;
-      if (nz0<0) {
-        const float D = 1.0f + nz1 - nz0;
-        nx0-=(int)((float)nz0*(1.0f + nx1 - nx0)/D);
-        ny0-=(int)((float)nz0*(1.0f + ny1 - ny0)/D);
-        nz0 = 0;
-      }
-      if (nz1>=depth()) {
-        const float d = (float)nz1 - depth(), D = 1.0f + nz1 - nz0;
-        nx1+=(int)(d*(1.0f + nx0 - nx1)/D);
-        ny1+=(int)(d*(1.0f + ny0 - ny1)/D);
-        nz1 = depth() - 1;
-      }
-      const unsigned int dmax = (unsigned int)cimg::max(cimg::abs(nx1 - nx0),cimg::abs(ny1 - ny0),nz1 - nz0);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      const float px = (nx1 - nx0)/(float)dmax, py = (ny1 - ny0)/(float)dmax, pz = (nz1 - nz0)/(float)dmax;
-      float x = (float)nx0, y = (float)ny0, z = (float)nz0;
-      if (opacity>=1) for (unsigned int t = 0; t<=dmax; ++t) {
-        if (!(~pattern) || (~pattern && pattern&hatch)) {
-          T* ptrd = data((unsigned int)x,(unsigned int)y,(unsigned int)z);
-          const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
-        }
-        x+=px; y+=py; z+=pz; if (pattern) { hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1); }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        for (unsigned int t = 0; t<=dmax; ++t) {
-          if (!(~pattern) || (~pattern && pattern&hatch)) {
-            T* ptrd = data((unsigned int)x,(unsigned int)y,(unsigned int)z);
-            const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(*(col++)*nopacity + *ptrd*copacity); ptrd+=whd; }
-          }
-          x+=px; y+=py; z+=pz; if (pattern) { hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1); }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a textured 2d line.
-    /**
-       \param x0 X-coordinate of the starting line point.
-       \param y0 Y-coordinate of the starting line point.
-       \param x1 X-coordinate of the ending line point.
-       \param y1 Y-coordinate of the ending line point.
-       \param texture Texture image defining the pixel colors.
-       \param tx0 X-coordinate of the starting texture point.
-       \param ty0 Y-coordinate of the starting texture point.
-       \param tx1 X-coordinate of the ending texture point.
-       \param ty1 Y-coordinate of the ending texture point.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if the hash variable must be reinitialized.
-       \note
-       - Line routine uses the well known Bresenham's algorithm.
-       \par Example:
-       \code
-       CImg<unsigned char> img(100,100,1,3,0), texture("texture256x256.ppm");
-       const unsigned char color[] = { 255,128,64 };
-       img.draw_line(40,40,80,70,texture,0,0,255,255);
-       \endcode
-    **/
-    template<typename tc>
-    CImg<T>& draw_line(const int x0, const int y0,
-                       const int x1, const int y1,
-                       const CImg<tc>& texture,
-                       const int tx0, const int ty0,
-                       const int tx1, const int ty1,
-                       const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty()) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture)) return draw_line(x0,y0,x1,y1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      const bool xdir = x0<x1, ydir = y0<y1;
-      int
-        dtx = tx1-tx0, dty = ty1-ty0,
-        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
-        tnx0 = tx0, tnx1 = tx1, tny0 = ty0, tny1 = ty1,
-        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1, &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
-        &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1, &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
-        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1, &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0,
-        &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1, &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
-      if (xright<0 || xleft>=width()) return *this;
-      if (xleft<0) {
-        const float D = (float)xright - xleft;
-        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
-        txleft-=(int)((float)xleft*((float)txright - txleft)/D);
-        tyleft-=(int)((float)xleft*((float)tyright - tyleft)/D);
-        xleft = 0;
-      }
-      if (xright>=width()) {
-        const float d = (float)xright - width(), D = (float)xright - xleft;
-        yright-=(int)(d*((float)yright - yleft)/D);
-        txright-=(int)(d*((float)txright - txleft)/D);
-        tyright-=(int)(d*((float)tyright - tyleft)/D);
-        xright = width() - 1;
-      }
-      if (ydown<0 || yup>=height()) return *this;
-      if (yup<0) {
-        const float D = (float)ydown - yup;
-        xup-=(int)((float)yup*((float)xdown - xup)/D);
-        txup-=(int)((float)yup*((float)txdown - txup)/D);
-        tyup-=(int)((float)yup*((float)tydown - tyup)/D);
-        yup = 0;
-      }
-      if (ydown>=height()) {
-        const float d = (float)ydown - height(), D = (float)ydown - yup;
-        xdown-=(int)(d*((float)xdown - xup)/D);
-        txdown-=(int)(d*((float)txdown - txup)/D);
-        tydown-=(int)(d*((float)tydown - tyup)/D);
-        ydown = height() - 1;
-      }
-      T *ptrd0 = data(nx0,ny0);
-      int dx = xright - xleft, dy = ydown - yup;
-      const bool steep = dy>dx;
-      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
-      const longT
-        offx = (longT)(nx0<nx1?1:-1)*(steep?width():1),
-        offy = (longT)(ny0<ny1?1:-1)*(steep?1:width()),
-        ndx = (longT)(dx>0?dx:1);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height;
-
-      if (opacity>=1) {
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            T *ptrd = ptrd0;
-            const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY(tx,ty);
-            cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          T *ptrd = ptrd0;
-          const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
-          const tc *col = &texture._atXY(tx,ty);
-          cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          T *ptrd = ptrd0;
-          if (pattern&hatch) {
-            const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY(tx,ty);
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          T *ptrd = ptrd0;
-          const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
-          const tc *col = &texture._atXY(tx,ty);
-          cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a textured 2d line, with perspective correction.
-    /**
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param z0 Z-coordinate of the starting point
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param z1 Z-coordinate of the ending point.
-       \param texture Texture image defining the pixel colors.
-       \param tx0 X-coordinate of the starting texture point.
-       \param ty0 Y-coordinate of the starting texture point.
-       \param tx1 X-coordinate of the ending texture point.
-       \param ty1 Y-coordinate of the ending texture point.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if the hash variable must be reinitialized.
-    **/
-    template<typename tc>
-    CImg<T>& draw_line(const int x0, const int y0, const float z0,
-                       const int x1, const int y1, const float z1,
-                       const CImg<tc>& texture,
-                       const int tx0, const int ty0,
-                       const int tx1, const int ty1,
-                       const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty() && z0<=0 && z1<=0) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_line(x0,y0,z0,x1,y1,z1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      const bool xdir = x0<x1, ydir = y0<y1;
-      int
-        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
-        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
-        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
-        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
-        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
-      float
-        Tx0 = tx0/z0, Tx1 = tx1/z1,
-        Ty0 = ty0/z0, Ty1 = ty1/z1,
-        Z0 = 1/z0, Z1 = 1/z1,
-        dz = Z1 - Z0, dtx = Tx1 - Tx0, dty = Ty1 - Ty0,
-        tnx0 = Tx0, tnx1 = Tx1, tny0 = Ty0, tny1 = Ty1, nz0 = Z0, nz1 = Z1,
-        &zleft = xdir?nz0:nz1, &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1,
-        &zright = xdir?nz1:nz0, &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
-        &zup = ydir?nz0:nz1, &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1,
-        &zdown = ydir?nz1:nz0, &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
-      if (xright<0 || xleft>=width()) return *this;
-      if (xleft<0) {
-        const float D = (float)xright - xleft;
-        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
-        zleft-=(float)xleft*(zright - zleft)/D;
-        txleft-=(float)xleft*(txright - txleft)/D;
-        tyleft-=(float)xleft*(tyright - tyleft)/D;
-        xleft = 0;
-      }
-      if (xright>=width()) {
-        const float d = (float)xright - width(), D = (float)xright - xleft;
-        yright-=(int)(d*((float)yright - yleft)/D);
-        zright-=d*(zright - zleft)/D;
-        txright-=d*(txright - txleft)/D;
-        tyright-=d*(tyright - tyleft)/D;
-        xright = width() - 1;
-      }
-      if (ydown<0 || yup>=height()) return *this;
-      if (yup<0) {
-        const float D = (float)ydown - yup;
-        xup-=(int)((float)yup*((float)xdown - xup)/D);
-        zup-=(float)yup*(zdown - zup)/D;
-        txup-=(float)yup*(txdown - txup)/D;
-        tyup-=(float)yup*(tydown - tyup)/D;
-        yup = 0;
-      }
-      if (ydown>=height()) {
-        const float d = (float)ydown - height(), D = (float)ydown - yup;
-        xdown-=(int)(d*((float)xdown - xup)/D);
-        zdown-=d*(zdown - zup)/D;
-        txdown-=d*(txdown - txup)/D;
-        tydown-=d*(tydown - tyup)/D;
-        ydown = height() - 1;
-      }
-      T *ptrd0 = data(nx0,ny0);
-      int dx = xright - xleft, dy = ydown - yup;
-      const bool steep = dy>dx;
-      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
-      const longT
-        offx = (longT)(nx0<nx1?1:-1)*(steep?width():1),
-        offy = (longT)(ny0<ny1?1:-1)*(steep?1:width()),
-        ndx = (longT)(dx>0?dx:1);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height;
-
-      if (opacity>=1) {
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-            T *ptrd = ptrd0;
-            cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-          const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-          T *ptrd = ptrd0;
-          cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-            T *ptrd = ptrd0;
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-          const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-          T *ptrd = ptrd0;
-          cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-          ptrd0+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a textured 2d line, with perspective correction and z-buffering.
-    /**
-       \param zbuffer Z-buffer image.
-       \param x0 X-coordinate of the starting point.
-       \param y0 Y-coordinate of the starting point.
-       \param z0 Z-coordinate of the starting point
-       \param x1 X-coordinate of the ending point.
-       \param y1 Y-coordinate of the ending point.
-       \param z1 Z-coordinate of the ending point.
-       \param texture Texture image defining the pixel colors.
-       \param tx0 X-coordinate of the starting texture point.
-       \param ty0 Y-coordinate of the starting texture point.
-       \param tx1 X-coordinate of the ending texture point.
-       \param ty1 Y-coordinate of the ending texture point.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch Tells if the hash variable must be reinitialized.
-    **/
-    template<typename tz, typename tc>
-    CImg<T>& draw_line(CImg<tz>& zbuffer,
-                       const int x0, const int y0, const float z0,
-                       const int x1, const int y1, const float z1,
-                       const CImg<tc>& texture,
-                       const int tx0, const int ty0,
-                       const int tx1, const int ty1,
-                       const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0) return *this;
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_line(zbuffer,x0,y0,z0,x1,y1,z1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
-      static unsigned int hatch = ~0U - (~0U>>1);
-      if (init_hatch) hatch = ~0U - (~0U>>1);
-      const bool xdir = x0<x1, ydir = y0<y1;
-      int
-        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
-        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
-        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
-        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
-        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
-      float
-        Tx0 = tx0/z0, Tx1 = tx1/z1,
-        Ty0 = ty0/z0, Ty1 = ty1/z1,
-        dtx = Tx1 - Tx0, dty = Ty1 - Ty0,
-        tnx0 = Tx0, tnx1 = Tx1, tny0 = Ty0, tny1 = Ty1,
-        &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1,
-        &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
-        &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1,
-        &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
-      tzfloat
-        Z0 = 1/(tzfloat)z0, Z1 = 1/(tzfloat)z1,
-        dz = Z1 - Z0,  nz0 = Z0, nz1 = Z1,
-        &zleft = xdir?nz0:nz1,
-        &zright = xdir?nz1:nz0,
-        &zup = ydir?nz0:nz1,
-        &zdown = ydir?nz1:nz0;
-      if (xright<0 || xleft>=width()) return *this;
-      if (xleft<0) {
-        const float D = (float)xright - xleft;
-        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
-        zleft-=(float)xleft*(zright - zleft)/D;
-        txleft-=(float)xleft*(txright - txleft)/D;
-        tyleft-=(float)xleft*(tyright - tyleft)/D;
-        xleft = 0;
-      }
-      if (xright>=width()) {
-        const float d = (float)xright - width(), D = (float)xright - xleft;
-        yright-=(int)(d*((float)yright - yleft)/D);
-        zright-=d*(zright - zleft)/D;
-        txright-=d*(txright - txleft)/D;
-        tyright-=d*(tyright - tyleft)/D;
-        xright = width() - 1;
-      }
-      if (ydown<0 || yup>=height()) return *this;
-      if (yup<0) {
-        const float D = (float)ydown - yup;
-        xup-=(int)((float)yup*((float)xdown - xup)/D);
-        zup-=yup*(zdown - zup)/D;
-        txup-=yup*(txdown - txup)/D;
-        tyup-=yup*(tydown - tyup)/D;
-        yup = 0;
-      }
-      if (ydown>=height()) {
-        const float d = (float)ydown - height(), D = (float)ydown - yup;
-        xdown-=(int)(d*((float)xdown - xup)/D);
-        zdown-=d*(zdown - zup)/D;
-        txdown-=d*(txdown - txup)/D;
-        tydown-=d*(tydown - tyup)/D;
-        ydown = height() - 1;
-      }
-      T *ptrd0 = data(nx0,ny0);
-      tz *ptrz = zbuffer.data(nx0,ny0);
-      int dx = xright - xleft, dy = ydown - yup;
-      const bool steep = dy>dx;
-      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
-      const longT
-        offx = (longT)(nx0<nx1?1:-1)*(steep?width():1),
-        offy = (longT)(ny0<ny1?1:-1)*(steep?1:width()),
-        ndx = (longT)(dx>0?dx:1);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height;
-
-      if (opacity>=1) {
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            const tzfloat z = Z0 + x*dz/ndx;
-            if (z>=(tzfloat)*ptrz) {
-              *ptrz = (tz)z;
-              const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-              const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-              T *ptrd = ptrd0;
-              cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-            }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz) {
-            *ptrz = (tz)z;
-            const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-            T *ptrd = ptrd0;
-            cimg_forC(*this,c) { *ptrd = (T)*col; ptrd+=whd; col+=twh; }
-          }
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        }
-      } else {
-        const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          if (pattern&hatch) {
-            const tzfloat z = Z0 + x*dz/ndx;
-            if (z>=(tzfloat)*ptrz) {
-              *ptrz = (tz)z;
-              const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-              const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-              T *ptrd = ptrd0;
-              cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-            }
-          }
-          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
-          const tzfloat z = Z0 + x*dz/ndx;
-          if (z>=(tzfloat)*ptrz) {
-            *ptrz = (tz)z;
-            const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
-            const tc *col = &texture._atXY((int)(tx/z),(int)(ty/z));
-            T *ptrd = ptrd0;
-            cimg_forC(*this,c) { *ptrd = (T)(nopacity**col + *ptrd*copacity); ptrd+=whd; col+=twh; }
-          }
-          ptrd0+=offx; ptrz+=offx;
-          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a set of consecutive lines.
-    /**
-       \param points Coordinates of vertices, stored as a list of vectors.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch If set to true, init hatch motif.
-       \note
-       - This function uses several call to the single CImg::draw_line() procedure,
-       depending on the vectors size in \p points.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_line(const CImg<t>& points,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty() || !points || points._width<2) return *this;
-      bool ninit_hatch = init_hatch;
-      switch (points._height) {
-      case 0 : case 1 :
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_line(): Invalid specified point set (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    points._width,points._height,points._depth,points._spectrum,points._data);
-
-      case 2 : {
-        const int x0 = (int)points(0,0), y0 = (int)points(0,1);
-        int ox = x0, oy = y0;
-        for (unsigned int i = 1; i<points._width; ++i) {
-          const int x = (int)points(i,0), y = (int)points(i,1);
-          draw_line(ox,oy,x,y,color,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y;
-        }
-      } break;
-      default : {
-        const int x0 = (int)points(0,0), y0 = (int)points(0,1), z0 = (int)points(0,2);
-        int ox = x0, oy = y0, oz = z0;
-        for (unsigned int i = 1; i<points._width; ++i) {
-          const int x = (int)points(i,0), y = (int)points(i,1), z = (int)points(i,2);
-          draw_line(ox,oy,oz,x,y,z,color,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y; oz = z;
-        }
-      }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d arrow.
-    /**
-       \param x0 X-coordinate of the starting arrow point (tail).
-       \param y0 Y-coordinate of the starting arrow point (tail).
-       \param x1 X-coordinate of the ending arrow point (head).
-       \param y1 Y-coordinate of the ending arrow point (head).
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param angle Aperture angle of the arrow head.
-       \param length Length of the arrow head. If negative, describes a percentage of the arrow length.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-    **/
-    template<typename tc>
-    CImg<T>& draw_arrow(const int x0, const int y0,
-                        const int x1, const int y1,
-                        const tc *const color, const float opacity=1,
-                        const float angle=30, const float length=-10,
-                        const unsigned int pattern=~0U) {
-      if (is_empty()) return *this;
-      const float u = (float)(x0 - x1), v = (float)(y0 - y1), sq = u*u + v*v,
-        deg = (float)(angle*cimg::PI/180), ang = (sq>0)?(float)std::atan2(v,u):0.0f,
-        l = (length>=0)?length:-length*(float)std::sqrt(sq)/100;
-      if (sq>0) {
-        const float
-            cl = (float)std::cos(ang - deg), sl = (float)std::sin(ang - deg),
-            cr = (float)std::cos(ang + deg), sr = (float)std::sin(ang + deg);
-        const int
-          xl = x1 + (int)(l*cl), yl = y1 + (int)(l*sl),
-          xr = x1 + (int)(l*cr), yr = y1 + (int)(l*sr),
-          xc = x1 + (int)((l + 1)*(cl + cr))/2, yc = y1 + (int)((l + 1)*(sl + sr))/2;
-        draw_line(x0,y0,xc,yc,color,opacity,pattern).draw_triangle(x1,y1,xl,yl,xr,yr,color,opacity);
-      } else draw_point(x0,y0,color,opacity);
-      return *this;
-    }
-
-    //! Draw a 2d spline.
-    /**
-       \param x0 X-coordinate of the starting curve point
-       \param y0 Y-coordinate of the starting curve point
-       \param u0 X-coordinate of the starting velocity
-       \param v0 Y-coordinate of the starting velocity
-       \param x1 X-coordinate of the ending curve point
-       \param y1 Y-coordinate of the ending curve point
-       \param u1 X-coordinate of the ending velocity
-       \param v1 Y-coordinate of the ending velocity
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param precision Curve drawing precision.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch If \c true, init hatch motif.
-       \note
-       - The curve is a 2d cubic Bezier spline, from the set of specified starting/ending points
-       and corresponding velocity vectors.
-       - The spline is drawn as a serie of connected segments. The \p precision parameter sets the
-       average number of pixels in each drawn segment.
-       - A cubic Bezier curve is sometimes defined by a set of 4 points { (\p x0,\p y0), (\p xa,\p ya),
-         (\p xb,\p yb), (\p x1,\p y1) } where (\p x0,\p y0) is the starting point, (\p x1,\p y1) is the ending point
-         and (\p xa,\p ya), (\p xb,\p yb) are two
-       \e control points.
-       The starting and ending velocities (\p u0,\p v0) and (\p u1,\p v1) can be deduced easily from
-       the control points as
-       \p u0 = (\p xa - \p x0), \p v0 = (\p ya - \p y0), \p u1 = (\p x1 - \p xb) and \p v1 = (\p y1 - \p yb).
-       \par Example:
-       \code
-       CImg<unsigned char> img(100,100,1,3,0);
-       const unsigned char color[] = { 255,255,255 };
-       img.draw_spline(30,30,0,100,90,40,0,-100,color);
-       \endcode
-    **/
-    template<typename tc>
-    CImg<T>& draw_spline(const int x0, const int y0, const float u0, const float v0,
-                         const int x1, const int y1, const float u1, const float v1,
-                         const tc *const color, const float opacity=1,
-                         const float precision=0.25, const unsigned int pattern=~0U,
-                         const bool init_hatch=true) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_spline(): Specified color is (null).",
-                                    cimg_instance);
-      if (x0==x1 && y0==y1) return draw_point(x0,y0,color,opacity);
-      bool ninit_hatch = init_hatch;
-      const float
-        ax = u0 + u1 + 2*(x0 - x1),
-        bx = 3*(x1 - x0) - 2*u0 - u1,
-        ay = v0 + v1 + 2*(y0 - y1),
-        by = 3*(y1 - y0) - 2*v0 - v1,
-        _precision = 1/(cimg::hypot((float)x0 - x1,(float)y0 - y1)*(precision>0?precision:1));
-      int ox = x0, oy = y0;
-      for (float t = 0; t<1; t+=_precision) {
-        const float t2 = t*t, t3 = t2*t;
-        const int
-          nx = (int)(ax*t3 + bx*t2 + u0*t + x0),
-          ny = (int)(ay*t3 + by*t2 + v0*t + y0);
-        draw_line(ox,oy,nx,ny,color,opacity,pattern,ninit_hatch);
-        ninit_hatch = false;
-        ox = nx; oy = ny;
-      }
-      return draw_line(ox,oy,x1,y1,color,opacity,pattern,false);
-    }
-
-    //! Draw a 3d spline \overloading.
-    /**
-       \note
-       - Similar to CImg::draw_spline() for a 3d spline in a volumetric image.
-    **/
-    template<typename tc>
-    CImg<T>& draw_spline(const int x0, const int y0, const int z0, const float u0, const float v0, const float w0,
-                         const int x1, const int y1, const int z1, const float u1, const float v1, const float w1,
-                         const tc *const color, const float opacity=1,
-                         const float precision=4, const unsigned int pattern=~0U,
-                         const bool init_hatch=true) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_spline(): Specified color is (null).",
-                                    cimg_instance);
-      if (x0==x1 && y0==y1 && z0==z1) return draw_point(x0,y0,z0,color,opacity);
-      bool ninit_hatch = init_hatch;
-      const float
-        ax = u0 + u1 + 2*(x0 - x1),
-        bx = 3*(x1 - x0) - 2*u0 - u1,
-        ay = v0 + v1 + 2*(y0 - y1),
-        by = 3*(y1 - y0) - 2*v0 - v1,
-        az = w0 + w1 + 2*(z0 - z1),
-        bz = 3*(z1 - z0) - 2*w0 - w1,
-        _precision = 1/(cimg::hypot((float)x0 - x1,(float)y0 - y1)*(precision>0?precision:1));
-      int ox = x0, oy = y0, oz = z0;
-      for (float t = 0; t<1; t+=_precision) {
-        const float t2 = t*t, t3 = t2*t;
-        const int
-          nx = (int)(ax*t3 + bx*t2 + u0*t + x0),
-          ny = (int)(ay*t3 + by*t2 + v0*t + y0),
-          nz = (int)(az*t3 + bz*t2 + w0*t + z0);
-        draw_line(ox,oy,oz,nx,ny,nz,color,opacity,pattern,ninit_hatch);
-        ninit_hatch = false;
-        ox = nx; oy = ny; oz = nz;
-      }
-      return draw_line(ox,oy,oz,x1,y1,z1,color,opacity,pattern,false);
-    }
-
-    //! Draw a textured 2d spline.
-    /**
-       \param x0 X-coordinate of the starting curve point
-       \param y0 Y-coordinate of the starting curve point
-       \param u0 X-coordinate of the starting velocity
-       \param v0 Y-coordinate of the starting velocity
-       \param x1 X-coordinate of the ending curve point
-       \param y1 Y-coordinate of the ending curve point
-       \param u1 X-coordinate of the ending velocity
-       \param v1 Y-coordinate of the ending velocity
-       \param texture Texture image defining line pixel colors.
-       \param tx0 X-coordinate of the starting texture point.
-       \param ty0 Y-coordinate of the starting texture point.
-       \param tx1 X-coordinate of the ending texture point.
-       \param ty1 Y-coordinate of the ending texture point.
-       \param precision Curve drawing precision.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch if \c true, reinit hatch motif.
-    **/
-    template<typename t>
-    CImg<T>& draw_spline(const int x0, const int y0, const float u0, const float v0,
-                         const int x1, const int y1, const float u1, const float v1,
-                         const CImg<t>& texture,
-                         const int tx0, const int ty0, const int tx1, const int ty1,
-                         const float opacity=1,
-                         const float precision=4, const unsigned int pattern=~0U,
-                         const bool init_hatch=true) {
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_spline(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_empty()) return *this;
-      if (is_overlapped(texture))
-        return draw_spline(x0,y0,u0,v0,x1,y1,u1,v1,+texture,tx0,ty0,tx1,ty1,precision,opacity,pattern,init_hatch);
-      if (x0==x1 && y0==y1)
-        return draw_point(x0,y0,texture.get_vector_at(x0<=0?0:x0>=texture.width()?texture.width() - 1:x0,
-                                                      y0<=0?0:y0>=texture.height()?texture.height() - 1:y0),opacity);
-      bool ninit_hatch = init_hatch;
-      const float
-        ax = u0 + u1 + 2*(x0 - x1),
-        bx = 3*(x1 - x0) - 2*u0 - u1,
-        ay = v0 + v1 + 2*(y0 - y1),
-        by = 3*(y1 - y0) - 2*v0 - v1,
-        _precision = 1/(cimg::hypot((float)x0 - x1,(float)y0 - y1)*(precision>0?precision:1));
-      int ox = x0, oy = y0, otx = tx0, oty = ty0;
-      for (float t1 = 0; t1<1; t1+=_precision) {
-        const float t2 = t1*t1, t3 = t2*t1;
-        const int
-          nx = (int)(ax*t3 + bx*t2 + u0*t1 + x0),
-          ny = (int)(ay*t3 + by*t2 + v0*t1 + y0),
-          ntx = tx0 + (int)((tx1 - tx0)*t1),
-          nty = ty0 + (int)((ty1 - ty0)*t1);
-        draw_line(ox,oy,nx,ny,texture,otx,oty,ntx,nty,opacity,pattern,ninit_hatch);
-        ninit_hatch = false;
-        ox = nx; oy = ny; otx = ntx; oty = nty;
-      }
-      return draw_line(ox,oy,x1,y1,texture,otx,oty,tx1,ty1,opacity,pattern,false);
-    }
-
-    //! Draw a set of consecutive splines.
-    /**
-       \param points Vertices data.
-       \param tangents Tangents data.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param is_closed_set Tells if the drawn spline set is closed.
-       \param precision Precision of the drawing.
-       \param pattern An integer whose bits describe the line pattern.
-       \param init_hatch If \c true, init hatch motif.
-    **/
-    template<typename tp, typename tt, typename tc>
-    CImg<T>& draw_spline(const CImg<tp>& points, const CImg<tt>& tangents,
-                         const tc *const color, const float opacity=1,
-                         const bool is_closed_set=false, const float precision=4,
-                         const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty() || !points || !tangents || points._width<2 || tangents._width<2) return *this;
-      bool ninit_hatch = init_hatch;
-      switch (points._height) {
-      case 0 : case 1 :
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_spline(): Invalid specified point set (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    points._width,points._height,points._depth,points._spectrum,points._data);
-
-      case 2 : {
-        const int x0 = (int)points(0,0), y0 = (int)points(0,1);
-        const float u0 = (float)tangents(0,0), v0 = (float)tangents(0,1);
-        int ox = x0, oy = y0;
-        float ou = u0, ov = v0;
-        for (unsigned int i = 1; i<points._width; ++i) {
-          const int x = (int)points(i,0), y = (int)points(i,1);
-          const float u = (float)tangents(i,0), v = (float)tangents(i,1);
-          draw_spline(ox,oy,ou,ov,x,y,u,v,color,precision,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y; ou = u; ov = v;
-        }
-        if (is_closed_set) draw_spline(ox,oy,ou,ov,x0,y0,u0,v0,color,precision,opacity,pattern,false);
-      } break;
-      default : {
-        const int x0 = (int)points(0,0), y0 = (int)points(0,1), z0 = (int)points(0,2);
-        const float u0 = (float)tangents(0,0), v0 = (float)tangents(0,1), w0 = (float)tangents(0,2);
-        int ox = x0, oy = y0, oz = z0;
-        float ou = u0, ov = v0, ow = w0;
-        for (unsigned int i = 1; i<points._width; ++i) {
-          const int x = (int)points(i,0), y = (int)points(i,1), z = (int)points(i,2);
-          const float u = (float)tangents(i,0), v = (float)tangents(i,1), w = (float)tangents(i,2);
-          draw_spline(ox,oy,oz,ou,ov,ow,x,y,z,u,v,w,color,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y; oz = z; ou = u; ov = v; ow = w;
-        }
-        if (is_closed_set) draw_spline(ox,oy,oz,ou,ov,ow,x0,y0,z0,u0,v0,w0,color,precision,opacity,pattern,false);
-      }
-      }
-      return *this;
-    }
-
-    //! Draw a set of consecutive splines \overloading.
-    /**
-       Similar to previous function, with the point tangents automatically estimated from the given points set.
-    **/
-    template<typename tp, typename tc>
-    CImg<T>& draw_spline(const CImg<tp>& points,
-                         const tc *const color, const float opacity=1,
-                         const bool is_closed_set=false, const float precision=4,
-                         const unsigned int pattern=~0U, const bool init_hatch=true) {
-      if (is_empty() || !points || points._width<2) return *this;
-      CImg<Tfloat> tangents;
-      switch (points._height) {
-      case 0 : case 1 :
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_spline(): Invalid specified point set (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    points._width,points._height,points._depth,points._spectrum,points._data);
-      case 2 : {
-        tangents.assign(points._width,points._height);
-        cimg_forX(points,p) {
-          const unsigned int
-            p0 = is_closed_set?(p + points._width - 1)%points._width:(p?p - 1:0),
-            p1 = is_closed_set?(p + 1)%points._width:(p + 1<points._width?p + 1:p);
-          const float
-            x = (float)points(p,0),
-            y = (float)points(p,1),
-            x0 = (float)points(p0,0),
-            y0 = (float)points(p0,1),
-            x1 = (float)points(p1,0),
-            y1 = (float)points(p1,1),
-            u0 = x - x0,
-            v0 = y - y0,
-            n0 = 1e-8f + cimg::hypot(u0,v0),
-            u1 = x1 - x,
-            v1 = y1 - y,
-            n1 = 1e-8f + cimg::hypot(u1,v1),
-            u = u0/n0 + u1/n1,
-            v = v0/n0 + v1/n1,
-            n = 1e-8f + cimg::hypot(u,v),
-            fact = 0.5f*(n0 + n1);
-          tangents(p,0) = (Tfloat)(fact*u/n);
-          tangents(p,1) = (Tfloat)(fact*v/n);
-        }
-      } break;
-      default : {
-        tangents.assign(points._width,points._height);
-        cimg_forX(points,p) {
-          const unsigned int
-            p0 = is_closed_set?(p + points._width - 1)%points._width:(p?p - 1:0),
-            p1 = is_closed_set?(p + 1)%points._width:(p + 1<points._width?p + 1:p);
-          const float
-            x = (float)points(p,0),
-            y = (float)points(p,1),
-            z = (float)points(p,2),
-            x0 = (float)points(p0,0),
-            y0 = (float)points(p0,1),
-            z0 = (float)points(p0,2),
-            x1 = (float)points(p1,0),
-            y1 = (float)points(p1,1),
-            z1 = (float)points(p1,2),
-            u0 = x - x0,
-            v0 = y - y0,
-            w0 = z - z0,
-            n0 = 1e-8f + cimg::hypot(u0,v0,w0),
-            u1 = x1 - x,
-            v1 = y1 - y,
-            w1 = z1 - z,
-            n1 = 1e-8f + cimg::hypot(u1,v1,w1),
-            u = u0/n0 + u1/n1,
-            v = v0/n0 + v1/n1,
-            w = w0/n0 + w1/n1,
-            n = 1e-8f + cimg::hypot(u,v,w),
-            fact = 0.5f*(n0 + n1);
-          tangents(p,0) = (Tfloat)(fact*u/n);
-          tangents(p,1) = (Tfloat)(fact*v/n);
-          tangents(p,2) = (Tfloat)(fact*w/n);
-        }
-      }
-      }
-      return draw_spline(points,tangents,color,opacity,is_closed_set,precision,pattern,init_hatch);
-    }
-
-    // Inner macro for drawing triangles.
-#define _cimg_for_triangle1(img,xl,xr,y,x0,y0,x1,y1,x2,y2) \
-        for (int y = y0<0?0:y0, \
-               xr = y0>=0?x0:(x0 - y0*(x2 - x0)/(y2 - y0)), \
-               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0 - y0*(x1 - x0)/(y1 - y0))):(x1 - y1*(x2 - x1)/(y2 - y1)), \
-               _sxn=1, \
-               _sxr=1, \
-               _sxl=1, \
-               _dxn = x2>x1?x2-x1:(_sxn=-1,x1 - x2), \
-               _dxr = x2>x0?x2-x0:(_sxr=-1,x0 - x2), \
-               _dxl = x1>x0?x1-x0:(_sxl=-1,x0 - x1), \
-               _dyn = y2-y1, \
-               _dyr = y2-y0, \
-               _dyl = y1-y0, \
-               _counter = (_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
-                           _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
-                           _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
-                           std::min((int)(img)._height - y - 1,y2 - y)), \
-               _errn = _dyn/2, \
-               _errr = _dyr/2, \
-               _errl = _dyl/2, \
-               _rxn = _dyn?(x2-x1)/_dyn:0, \
-               _rxr = _dyr?(x2-x0)/_dyr:0, \
-               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
-                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn); \
-             _counter>=0; --_counter, ++y, \
-               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
-               xl+=(y!=y1)?_rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0): \
-                           (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))
-
-#define _cimg_for_triangle2(img,xl,cl,xr,cr,y,x0,y0,c0,x1,y1,c1,x2,y2,c2) \
-        for (int y = y0<0?0:y0, \
-               xr = y0>=0?x0:(x0 - y0*(x2 - x0)/(y2 - y0)), \
-               cr = y0>=0?c0:(c0 - y0*(c2 - c0)/(y2 - y0)), \
-               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0 - y0*(x1 - x0)/(y1 - y0))):(x1 - y1*(x2 - x1)/(y2 - y1)), \
-               cl = y1>=0?(y0>=0?(y0==y1?c1:c0):(c0 - y0*(c1 - c0)/(y1 - y0))):(c1 - y1*(c2 - c1)/(y2 - y1)), \
-               _sxn=1, _scn=1, \
-               _sxr=1, _scr=1, \
-               _sxl=1, _scl=1, \
-               _dxn = x2>x1?x2-x1:(_sxn=-1,x1 - x2), \
-               _dxr = x2>x0?x2-x0:(_sxr=-1,x0 - x2), \
-               _dxl = x1>x0?x1-x0:(_sxl=-1,x0 - x1), \
-               _dcn = c2>c1?c2-c1:(_scn=-1,c1 - c2), \
-               _dcr = c2>c0?c2-c0:(_scr=-1,c0 - c2), \
-               _dcl = c1>c0?c1-c0:(_scl=-1,c0 - c1), \
-               _dyn = y2-y1, \
-               _dyr = y2-y0, \
-               _dyl = y1-y0, \
-               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
-                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
-                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
-                          _dcn-=_dyn?_dyn*(_dcn/_dyn):0, \
-                          _dcr-=_dyr?_dyr*(_dcr/_dyr):0, \
-                          _dcl-=_dyl?_dyl*(_dcl/_dyl):0, \
-                          std::min((int)(img)._height - y - 1,y2 - y)), \
-               _errn = _dyn/2, _errcn = _errn, \
-               _errr = _dyr/2, _errcr = _errr, \
-               _errl = _dyl/2, _errcl = _errl, \
-               _rxn = _dyn?(x2 - x1)/_dyn:0, \
-               _rcn = _dyn?(c2 - c1)/_dyn:0, \
-               _rxr = _dyr?(x2 - x0)/_dyr:0, \
-               _rcr = _dyr?(c2 - c0)/_dyr:0, \
-               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
-                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
-               _rcl = (y0!=y1 && y1>0)?(_dyl?(c1-c0)/_dyl:0): \
-                                       (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcn ); \
-             _counter>=0; --_counter, ++y, \
-               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
-               cr+=_rcr+((_errcr-=_dcr)<0?_errcr+=_dyr,_scr:0), \
-               xl+=(y!=y1)?(cl+=_rcl+((_errcl-=_dcl)<0?(_errcl+=_dyl,_scl):0), \
-                           _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
-               (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcl=_rcn, cl=c1, \
-                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))
-
-#define _cimg_for_triangle3(img,xl,txl,tyl,xr,txr,tyr,y,x0,y0,tx0,ty0,x1,y1,tx1,ty1,x2,y2,tx2,ty2) \
-        for (int y = y0<0?0:y0, \
-               xr = y0>=0?x0:(x0 - y0*(x2 - x0)/(y2 - y0)), \
-               txr = y0>=0?tx0:(tx0 - y0*(tx2 - tx0)/(y2 - y0)), \
-               tyr = y0>=0?ty0:(ty0 - y0*(ty2 - ty0)/(y2 - y0)), \
-               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0 - y0*(x1 - x0)/(y1 - y0))):(x1 - y1*(x2 - x1)/(y2 - y1)), \
-               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0 - y0*(tx1 - tx0)/(y1 - y0))):(tx1 - y1*(tx2 - tx1)/(y2 - y1)), \
-               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0 - y0*(ty1 - ty0)/(y1 - y0))):(ty1 - y1*(ty2 - ty1)/(y2 - y1)), \
-               _sxn=1, _stxn=1, _styn=1, \
-               _sxr=1, _stxr=1, _styr=1, \
-               _sxl=1, _stxl=1, _styl=1, \
-               _dxn = x2>x1?x2 - x1:(_sxn=-1,x1 - x2), \
-               _dxr = x2>x0?x2 - x0:(_sxr=-1,x0 - x2), \
-               _dxl = x1>x0?x1 - x0:(_sxl=-1,x0 - x1), \
-               _dtxn = tx2>tx1?tx2 - tx1:(_stxn=-1,tx1 - tx2), \
-               _dtxr = tx2>tx0?tx2 - tx0:(_stxr=-1,tx0 - tx2), \
-               _dtxl = tx1>tx0?tx1 - tx0:(_stxl=-1,tx0 - tx1), \
-               _dtyn = ty2>ty1?ty2 - ty1:(_styn=-1,ty1 - ty2), \
-               _dtyr = ty2>ty0?ty2 - ty0:(_styr=-1,ty0 - ty2), \
-               _dtyl = ty1>ty0?ty1 - ty0:(_styl=-1,ty0 - ty1), \
-               _dyn = y2-y1, \
-               _dyr = y2-y0, \
-               _dyl = y1-y0, \
-               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
-                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
-                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
-                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
-                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
-                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
-                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
-                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
-                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
-                          std::min((int)(img)._height - y - 1,y2 - y)), \
-               _errn = _dyn/2, _errtxn = _errn, _errtyn = _errn, \
-               _errr = _dyr/2, _errtxr = _errr, _errtyr = _errr, \
-               _errl = _dyl/2, _errtxl = _errl, _errtyl = _errl, \
-               _rxn = _dyn?(x2 - x1)/_dyn:0, \
-               _rtxn = _dyn?(tx2 - tx1)/_dyn:0, \
-               _rtyn = _dyn?(ty2 - ty1)/_dyn:0, \
-               _rxr = _dyr?(x2 - x0)/_dyr:0, \
-               _rtxr = _dyr?(tx2 - tx0)/_dyr:0, \
-               _rtyr = _dyr?(ty2 - ty0)/_dyr:0, \
-               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1 - x0)/_dyl:0): \
-                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
-               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1 - tx0)/_dyl:0): \
-                                       (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
-               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1 - ty0)/_dyl:0): \
-                                       (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ); \
-             _counter>=0; --_counter, ++y, \
-               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
-               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
-               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
-               xl+=(y!=y1)?(txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
-                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
-                           _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
-               (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
-                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1,\
-                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1 - xl))
-
-#define _cimg_for_triangle4(img,xl,cl,txl,tyl,xr,cr,txr,tyr,y,x0,y0,c0,tx0,ty0,x1,y1,c1,tx1,ty1,x2,y2,c2,tx2,ty2) \
-        for (int y = y0<0?0:y0, \
-               xr = y0>=0?x0:(x0 - y0*(x2 - x0)/(y2 - y0)), \
-               cr = y0>=0?c0:(c0 - y0*(c2 - c0)/(y2 - y0)), \
-               txr = y0>=0?tx0:(tx0 - y0*(tx2 - tx0)/(y2 - y0)), \
-               tyr = y0>=0?ty0:(ty0 - y0*(ty2 - ty0)/(y2 - y0)), \
-               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0 - y0*(x1 - x0)/(y1 - y0))):(x1 - y1*(x2 - x1)/(y2 - y1)), \
-               cl = y1>=0?(y0>=0?(y0==y1?c1:c0):(c0 - y0*(c1 - c0)/(y1 - y0))):(c1 - y1*(c2 - c1)/(y2 - y1)), \
-               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0 - y0*(tx1 - tx0)/(y1 - y0))):(tx1 - y1*(tx2 - tx1)/(y2 - y1)), \
-               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0 - y0*(ty1 - ty0)/(y1 - y0))):(ty1 - y1*(ty2 - ty1)/(y2 - y1)), \
-               _sxn=1, _scn=1, _stxn=1, _styn=1, \
-               _sxr=1, _scr=1, _stxr=1, _styr=1, \
-               _sxl=1, _scl=1, _stxl=1, _styl=1, \
-               _dxn = x2>x1?x2 - x1:(_sxn=-1,x1 - x2), \
-               _dxr = x2>x0?x2 - x0:(_sxr=-1,x0 - x2), \
-               _dxl = x1>x0?x1 - x0:(_sxl=-1,x0 - x1), \
-               _dcn = c2>c1?c2 - c1:(_scn=-1,c1 - c2), \
-               _dcr = c2>c0?c2 - c0:(_scr=-1,c0 - c2), \
-               _dcl = c1>c0?c1 - c0:(_scl=-1,c0 - c1), \
-               _dtxn = tx2>tx1?tx2 - tx1:(_stxn=-1,tx1 - tx2), \
-               _dtxr = tx2>tx0?tx2 - tx0:(_stxr=-1,tx0 - tx2), \
-               _dtxl = tx1>tx0?tx1 - tx0:(_stxl=-1,tx0 - tx1), \
-               _dtyn = ty2>ty1?ty2 - ty1:(_styn=-1,ty1 - ty2), \
-               _dtyr = ty2>ty0?ty2 - ty0:(_styr=-1,ty0 - ty2), \
-               _dtyl = ty1>ty0?ty1 - ty0:(_styl=-1,ty0 - ty1), \
-               _dyn = y2 - y1, \
-               _dyr = y2 - y0, \
-               _dyl = y1 - y0, \
-               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
-                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
-                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
-                          _dcn-=_dyn?_dyn*(_dcn/_dyn):0, \
-                          _dcr-=_dyr?_dyr*(_dcr/_dyr):0, \
-                          _dcl-=_dyl?_dyl*(_dcl/_dyl):0, \
-                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
-                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
-                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
-                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
-                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
-                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
-                          std::min((int)(img)._height - y - 1,y2 - y)), \
-               _errn = _dyn/2, _errcn = _errn, _errtxn = _errn, _errtyn = _errn, \
-               _errr = _dyr/2, _errcr = _errr, _errtxr = _errr, _errtyr = _errr, \
-               _errl = _dyl/2, _errcl = _errl, _errtxl = _errl, _errtyl = _errl, \
-               _rxn = _dyn?(x2 - x1)/_dyn:0, \
-               _rcn = _dyn?(c2 - c1)/_dyn:0, \
-               _rtxn = _dyn?(tx2 - tx1)/_dyn:0, \
-               _rtyn = _dyn?(ty2 - ty1)/_dyn:0, \
-               _rxr = _dyr?(x2 - x0)/_dyr:0, \
-               _rcr = _dyr?(c2 - c0)/_dyr:0, \
-               _rtxr = _dyr?(tx2 - tx0)/_dyr:0, \
-               _rtyr = _dyr?(ty2 - ty0)/_dyr:0, \
-               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1 - x0)/_dyl:0): \
-                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
-               _rcl = (y0!=y1 && y1>0)?(_dyl?(c1 - c0)/_dyl:0): \
-                                       (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcn ), \
-               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1 - tx0)/_dyl:0): \
-                                        (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
-               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1 - ty0)/_dyl:0): \
-                                        (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ); \
-             _counter>=0; --_counter, ++y, \
-               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
-               cr+=_rcr+((_errcr-=_dcr)<0?_errcr+=_dyr,_scr:0), \
-               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
-               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
-               xl+=(y!=y1)?(cl+=_rcl+((_errcl-=_dcl)<0?(_errcl+=_dyl,_scl):0), \
-                            txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
-                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
-                            _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
-               (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcl=_rcn, cl=c1, \
-                _errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
-                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1, \
-                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1 - xl))
-
-#define _cimg_for_triangle5(img,xl,txl,tyl,lxl,lyl,xr,txr,tyr,lxr,lyr,y,x0,y0,\
-                            tx0,ty0,lx0,ly0,x1,y1,tx1,ty1,lx1,ly1,x2,y2,tx2,ty2,lx2,ly2) \
-        for (int y = y0<0?0:y0, \
-               xr = y0>=0?x0:(x0 - y0*(x2 - x0)/(y2 - y0)), \
-               txr = y0>=0?tx0:(tx0 - y0*(tx2 - tx0)/(y2 - y0)), \
-               tyr = y0>=0?ty0:(ty0 - y0*(ty2 - ty0)/(y2 - y0)), \
-               lxr = y0>=0?lx0:(lx0 - y0*(lx2 - lx0)/(y2 - y0)), \
-               lyr = y0>=0?ly0:(ly0 - y0*(ly2 - ly0)/(y2 - y0)), \
-               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0 - y0*(x1 - x0)/(y1 - y0))):(x1 - y1*(x2 - x1)/(y2 - y1)), \
-               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0 - y0*(tx1 - tx0)/(y1 - y0))):(tx1 - y1*(tx2 - tx1)/(y2 - y1)), \
-               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0 - y0*(ty1 - ty0)/(y1 - y0))):(ty1 - y1*(ty2 - ty1)/(y2 - y1)), \
-               lxl = y1>=0?(y0>=0?(y0==y1?lx1:lx0):(lx0 - y0*(lx1 - lx0)/(y1 - y0))):(lx1 - y1*(lx2 - lx1)/(y2 - y1)), \
-               lyl = y1>=0?(y0>=0?(y0==y1?ly1:ly0):(ly0 - y0*(ly1 - ly0)/(y1 - y0))):(ly1 - y1*(ly2 - ly1)/(y2 - y1)), \
-               _sxn=1, _stxn=1, _styn=1, _slxn=1, _slyn=1, \
-               _sxr=1, _stxr=1, _styr=1, _slxr=1, _slyr=1, \
-               _sxl=1, _stxl=1, _styl=1, _slxl=1, _slyl=1, \
-               _dxn = x2>x1?x2 - x1:(_sxn=-1,x1 - x2), _dyn = y2 - y1, \
-               _dxr = x2>x0?x2 - x0:(_sxr=-1,x0 - x2), _dyr = y2 - y0, \
-               _dxl = x1>x0?x1 - x0:(_sxl=-1,x0 - x1), _dyl = y1 - y0, \
-               _dtxn = tx2>tx1?tx2 - tx1:(_stxn=-1,tx1 - tx2), \
-               _dtxr = tx2>tx0?tx2 - tx0:(_stxr=-1,tx0 - tx2), \
-               _dtxl = tx1>tx0?tx1 - tx0:(_stxl=-1,tx0 - tx1), \
-               _dtyn = ty2>ty1?ty2 - ty1:(_styn=-1,ty1 - ty2), \
-               _dtyr = ty2>ty0?ty2 - ty0:(_styr=-1,ty0 - ty2), \
-               _dtyl = ty1>ty0?ty1 - ty0:(_styl=-1,ty0 - ty1), \
-               _dlxn = lx2>lx1?lx2 - lx1:(_slxn=-1,lx1 - lx2), \
-               _dlxr = lx2>lx0?lx2 - lx0:(_slxr=-1,lx0 - lx2), \
-               _dlxl = lx1>lx0?lx1 - lx0:(_slxl=-1,lx0 - lx1), \
-               _dlyn = ly2>ly1?ly2 - ly1:(_slyn=-1,ly1 - ly2), \
-               _dlyr = ly2>ly0?ly2 - ly0:(_slyr=-1,ly0 - ly2), \
-               _dlyl = ly1>ly0?ly1 - ly0:(_slyl=-1,ly0 - ly1), \
-               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
-                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
-                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
-                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
-                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
-                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
-                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
-                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
-                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
-                          _dlxn-=_dyn?_dyn*(_dlxn/_dyn):0, \
-                          _dlxr-=_dyr?_dyr*(_dlxr/_dyr):0, \
-                          _dlxl-=_dyl?_dyl*(_dlxl/_dyl):0, \
-                          _dlyn-=_dyn?_dyn*(_dlyn/_dyn):0, \
-                          _dlyr-=_dyr?_dyr*(_dlyr/_dyr):0, \
-                          _dlyl-=_dyl?_dyl*(_dlyl/_dyl):0, \
-                          std::min((int)(img)._height - y - 1,y2 - y)), \
-               _errn = _dyn/2, _errtxn = _errn, _errtyn = _errn, _errlxn = _errn, _errlyn = _errn, \
-               _errr = _dyr/2, _errtxr = _errr, _errtyr = _errr, _errlxr = _errr, _errlyr = _errr, \
-               _errl = _dyl/2, _errtxl = _errl, _errtyl = _errl, _errlxl = _errl, _errlyl = _errl, \
-               _rxn = _dyn?(x2 - x1)/_dyn:0, \
-               _rtxn = _dyn?(tx2 - tx1)/_dyn:0, \
-               _rtyn = _dyn?(ty2 - ty1)/_dyn:0, \
-               _rlxn = _dyn?(lx2 - lx1)/_dyn:0, \
-               _rlyn = _dyn?(ly2 - ly1)/_dyn:0, \
-               _rxr = _dyr?(x2 - x0)/_dyr:0, \
-               _rtxr = _dyr?(tx2 - tx0)/_dyr:0, \
-               _rtyr = _dyr?(ty2 - ty0)/_dyr:0, \
-               _rlxr = _dyr?(lx2 - lx0)/_dyr:0, \
-               _rlyr = _dyr?(ly2 - ly0)/_dyr:0, \
-               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1 - x0)/_dyl:0): \
-                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
-               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1 - tx0)/_dyl:0): \
-                                        (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
-               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1 - ty0)/_dyl:0): \
-                                        (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ), \
-               _rlxl = (y0!=y1 && y1>0)?(_dyl?(lx1 - lx0)/_dyl:0): \
-                                        (_errlxl=_errlxn, _dlxl=_dlxn, _dyl=_dyn, _slxl=_slxn, _rlxn ), \
-               _rlyl = (y0!=y1 && y1>0)?(_dyl?(ly1 - ly0)/_dyl:0): \
-                                        (_errlyl=_errlyn, _dlyl=_dlyn, _dyl=_dyn, _slyl=_slyn, _rlyn ); \
-             _counter>=0; --_counter, ++y, \
-               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
-               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
-               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
-               lxr+=_rlxr+((_errlxr-=_dlxr)<0?_errlxr+=_dyr,_slxr:0), \
-               lyr+=_rlyr+((_errlyr-=_dlyr)<0?_errlyr+=_dyr,_slyr:0), \
-               xl+=(y!=y1)?(txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
-                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
-                            lxl+=_rlxl+((_errlxl-=_dlxl)<0?(_errlxl+=_dyl,_slxl):0), \
-                            lyl+=_rlyl+((_errlyl-=_dlyl)<0?(_errlyl+=_dyl,_slyl):0), \
-                            _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
-               (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
-                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1, \
-                _errlxl=_errlxn, _dlxl=_dlxn, _dyl=_dyn, _slxl=_slxn, _rlxl=_rlxn, lxl=lx1, \
-                _errlyl=_errlyn, _dlyl=_dlyn, _dyl=_dyn, _slyl=_slyn, _rlyl=_rlyn, lyl=ly1, \
-                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1 - xl))
-
-    // [internal] Draw a filled triangle.
-    template<typename tc>
-    CImg<T>& _draw_triangle(const int x0, const int y0,
-                            const int x1, const int y1,
-                            const int x2, const int y2,
-                            const tc *const color, const float opacity,
-                            const float brightness) {
-      cimg_init_scanline(color,opacity);
-      const float nbrightness = cimg::cut(brightness,0,2);
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2);
-      if (ny0<height() && ny2>=0) {
-        if ((nx1 - nx0)*(ny2 - ny0) - (nx2 - nx0)*(ny1 - ny0)<0)
-          _cimg_for_triangle1(*this,xl,xr,y,nx0,ny0,nx1,ny1,nx2,ny2)
-            cimg_draw_scanline(xl,xr,y,color,opacity,nbrightness);
-        else
-          _cimg_for_triangle1(*this,xl,xr,y,nx0,ny0,nx1,ny1,nx2,ny2)
-            cimg_draw_scanline(xr,xl,y,color,opacity,nbrightness);
-      }
-      return *this;
-    }
-
-    //! Draw a filled 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex.
-       \param y0 Y-coordinate of the first vertex.
-       \param x1 X-coordinate of the second vertex.
-       \param y1 Y-coordinate of the second vertex.
-       \param x2 X-coordinate of the third vertex.
-       \param y2 Y-coordinate of the third vertex.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-     **/
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      _draw_triangle(x0,y0,x1,y1,x2,y2,color,opacity,1);
-      return *this;
-    }
-
-    //! Draw a outlined 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex.
-       \param y0 Y-coordinate of the first vertex.
-       \param x1 X-coordinate of the second vertex.
-       \param y1 Y-coordinate of the second vertex.
-       \param x2 X-coordinate of the third vertex.
-       \param y2 Y-coordinate of the third vertex.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the outline pattern.
-     **/
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const tc *const color, const float opacity,
-                           const unsigned int pattern) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      draw_line(x0,y0,x1,y1,color,opacity,pattern,true).
-        draw_line(x1,y1,x2,y2,color,opacity,pattern,false).
-        draw_line(x2,y2,x0,y0,color,opacity,pattern,false);
-      return *this;
-    }
-
-    //! Draw a filled 2d triangle, with z-buffering.
-    /**
-       \param zbuffer Z-buffer image.
-       \param x0 X-coordinate of the first vertex.
-       \param y0 Y-coordinate of the first vertex.
-       \param z0 Z-coordinate of the first vertex.
-       \param x1 X-coordinate of the second vertex.
-       \param y1 Y-coordinate of the second vertex.
-       \param z1 Z-coordinate of the second vertex.
-       \param x2 X-coordinate of the third vertex.
-       \param y2 Y-coordinate of the third vertex.
-       \param z2 Z-coordinate of the third vertex.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param brightness Brightness factor.
-    **/
-    template<typename tz, typename tc>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const tc *const color, const float opacity=1,
-                           const float brightness=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float
-        nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f),
-        nbrightness = cimg::cut(brightness,0,2);
-      const longT whd = (longT)width()*height()*depth(), offx = spectrum()*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
-        if (y==ny1) { zl = nz1; pzl = pzn; }
-        int xleft = xleft0, xright = xright0;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright);
-        const int dx = xright - xleft;
-        const tzfloat pentez = (zright - zleft)/dx;
-        if (xleft<0 && dx) zleft-=xleft*(zright - zleft)/dx;
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        tz *ptrz = xleft<=xright?zbuffer.data(xleft,y):0;
-        if (opacity>=1) {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(nbrightness*(*col++)); ptrd+=whd; }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color;
-              cimg_forC(*this,c) { *ptrd = (T)((2 - nbrightness)**(col++) + (nbrightness - 1)*maxval); ptrd+=whd; }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          }
-        } else {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=whd; }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color;
-              cimg_forC(*this,c) { *ptrd = (T)(nopacity*nbrightness**(col++) + *ptrd*copacity); ptrd+=whd; }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-              const tc *col = color;
-              cimg_forC(*this,c) {
-                const T val = (T)((2 - nbrightness)**(col++) + (nbrightness - 1)*maxval);
-                *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                ptrd+=whd;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-          }
-        }
-        zr+=pzr; zl+=pzl;
-      }
-      return *this;
-    }
-
-    //! Draw a Gouraud-shaded 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param brightness0 Brightness factor of the first vertex (in [0,2]).
-       \param brightness1 brightness factor of the second vertex (in [0,2]).
-       \param brightness2 brightness factor of the third vertex (in [0,2]).
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const tc *const color,
-                           const float brightness0,
-                           const float brightness1,
-                           const float brightness2,
-                           const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const longT whd = (longT)width()*height()*depth(), offx = spectrum()*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
-        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
-        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nc0,nc1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nc0,nc2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nc1,nc2);
-      if (ny0>=height() || ny2<0) return *this;
-      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
-        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
-        if (xright<xleft) cimg::swap(xleft,xright,cleft,cright);
-        const int
-          dx = xright - xleft,
-          dc = cright>cleft?cright - cleft:cleft - cright,
-          rc = dx?(cright - cleft)/dx:0,
-          sc = cright>cleft?1:-1,
-          ndc = dc - (dx?dx*(dc/dx):0);
-        int errc = dx>>1;
-        if (xleft<0 && dx) cleft-=xleft*(cright - cleft)/dx;
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const tc *col = color;
-          cimg_forC(*this,c) {
-            *ptrd = (T)(cleft<256?cleft**(col++)/256:((512 - cleft)**(col++)+(cleft - 256)*maxval)/256);
-            ptrd+=whd;
-          }
-          ptrd-=offx;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-        } else for (int x = xleft; x<=xright; ++x) {
-          const tc *col = color;
-          cimg_forC(*this,c) {
-            const T val = (T)(cleft<256?cleft**(col++)/256:((512 - cleft)**(col++)+(cleft - 256)*maxval)/256);
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd;
-          }
-          ptrd-=offx;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a Gouraud-shaded 2d triangle, with z-buffering \overloading.
-    template<typename tz, typename tc>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const tc *const color,
-                           const float brightness0,
-                           const float brightness1,
-                           const float brightness2,
-                           const float opacity=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const longT whd = (longT)width()*height()*depth(), offx = spectrum()*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
-        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
-        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1,nc0,nc1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nz0,nz2,nc0,nc2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nz1,nz2,nc1,nc2);
-      if (ny0>=height() || ny2<0) return *this;
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
-        if (y==ny1) { zl = nz1; pzl = pzn; }
-        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,cleft,cright);
-        const int
-          dx = xright - xleft,
-          dc = cright>cleft?cright - cleft:cleft - cright,
-          rc = dx?(cright - cleft)/dx:0,
-          sc = cright>cleft?1:-1,
-          ndc = dc - (dx?dx*(dc/dx):0);
-        const tzfloat pentez = (zright - zleft)/dx;
-        int errc = dx>>1;
-        if (xleft<0 && dx) {
-          cleft-=xleft*(cright - cleft)/dx;
-          zleft-=xleft*(zright - zleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T *ptrd = data(xleft,y);
-        tz *ptrz = xleft<=xright?zbuffer.data(xleft,y):0;
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tc *col = color;
-              cimg_forC(*this,c) {
-                *ptrd = (T)(cleft<256?cleft**(col++)/256:((512 - cleft)**(col++)+(cleft - 256)*maxval)/256);
-                ptrd+=whd;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          } else for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tc *col = color;
-              cimg_forC(*this,c) {
-                const T val = (T)(cleft<256?cleft**(col++)/256:((512 - cleft)**(col++)+(cleft - 256)*maxval)/256);
-                *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                ptrd+=whd;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          }
-        zr+=pzr; zl+=pzl;
-      }
-      return *this;
-    }
-
-    //! Draw a color-interpolated 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param color1 Pointer to \c spectrum() consecutive values of type \c T, defining the color of the first vertex.
-       \param color2 Pointer to \c spectrum() consecutive values of type \c T, defining the color of the seconf vertex.
-       \param color3 Pointer to \c spectrum() consecutive values of type \c T, defining the color of the third vertex.
-       \param opacity Drawing opacity.
-     **/
-    template<typename tc1, typename tc2, typename tc3>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const tc1 *const color1,
-                           const tc2 *const color2,
-                           const tc3 *const color3,
-                           const float opacity=1) {
-      const unsigned char one = 1;
-      cimg_forC(*this,c)
-        get_shared_channel(c).draw_triangle(x0,y0,x1,y1,x2,y2,&one,color1[c],color2[c],color3[c],opacity);
-      return *this;
-    }
-
-    //! Draw a textured 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param texture Texture image used to fill the triangle.
-       \param tx0 X-coordinate of the first vertex in the texture image.
-       \param ty0 Y-coordinate of the first vertex in the texture image.
-       \param tx1 X-coordinate of the second vertex in the texture image.
-       \param ty1 Y-coordinate of the second vertex in the texture image.
-       \param tx2 X-coordinate of the third vertex in the texture image.
-       \param ty2 Y-coordinate of the third vertex in the texture image.
-       \param opacity Drawing opacity.
-       \param brightness Brightness factor of the drawing (in [0,2]).
-    **/
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float opacity=1,
-                           const float brightness=1) {
-      if (is_empty()) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),cimg::type<tc>::max());
-      const float
-        nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f),
-        nbrightness = cimg::cut(brightness,0,2);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2);
-      if (ny0>=height() || ny2<0) return *this;
-      _cimg_for_triangle3(*this,xleft0,txleft0,tyleft0,xright0,txright0,tyright0,y,
-                          nx0,ny0,ntx0,nty0,nx1,ny1,ntx1,nty1,nx2,ny2,ntx2,nty2) {
-        int
-          xleft = xleft0, xright = xright0,
-          txleft = txleft0, txright = txright0,
-          tyleft = tyleft0, tyright = tyright0;
-        if (xright<xleft) cimg::swap(xleft,xright,txleft,txright,tyleft,tyright);
-        const int
-          dx = xright - xleft,
-          dtx = txright>txleft?txright - txleft:txleft - txright,
-          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
-          rtx = dx?(txright - txleft)/dx:0,
-          rty = dx?(tyright - tyleft)/dx:0,
-          stx = txright>txleft?1:-1,
-          sty = tyright>tyleft?1:-1,
-          ndtx = dtx - (dx?dx*(dtx/dx):0),
-          ndty = dty - (dx?dx*(dty/dx):0);
-        int errtx = dx>>1, errty = errtx;
-        if (xleft<0 && dx) {
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              *ptrd = (T)*col;
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nbrightness**col);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          } else for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              *ptrd = (T)((2 - nbrightness)**(col++) + (nbrightness - 1)*maxval);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          }
-        } else {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nopacity**col + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          } else for (int x = xleft; x<=xright; ++x) {
-            const tc *col = &texture._atXY(txleft,tyleft);
-            cimg_forC(*this,c) {
-              const T val = (T)((2 - nbrightness)**(col++) + (nbrightness - 1)*maxval);
-              *ptrd = (T)(nopacity*val + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx;
-            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d textured triangle, with perspective correction.
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float opacity=1,
-                           const float brightness=1) {
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float
-        nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f),
-        nbrightness = cimg::cut(brightness,0,2);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2,
-        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int xleft = xleft0, xright = xright0;
-        float
-          zleft = zl, zright = zr,
-          txleft = txl, txright = txr,
-          tyleft = tyl, tyright = tyr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright);
-        const int dx = xright - xleft;
-        const float
-          pentez = (zright - zleft)/dx,
-          pentetx = (txright - txleft)/dx,
-          pentety = (tyright - tyleft)/dx;
-        if (xleft<0 && dx) {
-          zleft-=xleft*(zright - zleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              *ptrd = (T)*col;
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          } else if (nbrightness<1) for (int x=xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nbrightness**col);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          } else for (int x = xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              *ptrd = (T)((2 - nbrightness)**col + (nbrightness - 1)*maxval);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          }
-        } else {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nopacity**col + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          } else for (int x = xleft; x<=xright; ++x) {
-            const float invz = 1/zleft;
-            const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-            cimg_forC(*this,c) {
-              const T val = (T)((2 - nbrightness)**col + (nbrightness - 1)*maxval);
-              *ptrd = (T)(nopacity*val + *ptrd*copacity);
-              ptrd+=whd; col+=twh;
-            }
-            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          }
-        }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a textured 2d triangle, with perspective correction and z-buffering.
-    template<typename tz, typename tc>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float opacity=1,
-                           const float brightness=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float
-        nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f),
-        nbrightness = cimg::cut(brightness,0,2);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2;
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int xleft = xleft0, xright = xright0;
-        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright);
-        const int dx = xright - xleft;
-        const float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
-        const tzfloat pentez = (zright - zleft)/dx;
-        if (xleft<0 && dx) {
-          zleft-=xleft*(zright - zleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T *ptrd = data(xleft,y,0,0);
-        tz *ptrz = zbuffer.data(xleft,y);
-        if (opacity>=1) {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  *ptrd = (T)*col;
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  *ptrd = (T)(nbrightness**col);
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  *ptrd = (T)((2 - nbrightness)**col + (nbrightness - 1)*maxval);
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            }
-        } else {
-          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  *ptrd = (T)(nopacity**col + *ptrd*copacity);
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-              if (zleft>=(tzfloat)*ptrz) {
-                *ptrz = (tz)zleft;
-                const tzfloat invz = 1/zleft;
-                const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-                cimg_forC(*this,c) {
-                  const T val = (T)((2 - nbrightness)**col + (nbrightness - 1)*maxval);
-                  *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                  ptrd+=whd; col+=twh;
-                }
-                ptrd-=offx;
-              }
-              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            }
-        }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a Phong-shaded 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param light Light image.
-       \param lx0 X-coordinate of the first vertex in the light image.
-       \param ly0 Y-coordinate of the first vertex in the light image.
-       \param lx1 X-coordinate of the second vertex in the light image.
-       \param ly1 Y-coordinate of the second vertex in the light image.
-       \param lx2 X-coordinate of the third vertex in the light image.
-       \param ly2 Y-coordinate of the third vertex in the light image.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc, typename tl>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const tc *const color,
-                           const CImg<tl>& light,
-                           const int lx0, const int ly0,
-                           const int lx1, const int ly1,
-                           const int lx2, const int ly2,
-                           const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      if (light._depth>1 || light._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified light texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
-      if (is_overlapped(light)) return draw_triangle(x0,y0,x1,y1,x2,y2,color,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        lwh = (ulongT)light._width*light._height,
-        offx = _spectrum*whd - 1;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nlx0,nlx1,nly0,nly1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nlx0,nlx2,nly0,nly2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nlx1,nlx2,nly1,nly2);
-      if (ny0>=height() || ny2<0) return *this;
-      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
-                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
-        int
-          xleft = xleft0, xright = xright0,
-          lxleft = lxleft0, lxright = lxright0,
-          lyleft = lyleft0, lyright = lyright0;
-        if (xright<xleft) cimg::swap(xleft,xright,lxleft,lxright,lyleft,lyright);
-        const int
-          dx = xright - xleft,
-          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
-          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
-          rlx = dx?(lxright - lxleft)/dx:0,
-          rly = dx?(lyright - lyleft)/dx:0,
-          slx = lxright>lxleft?1:-1,
-          sly = lyright>lyleft?1:-1,
-          ndlx = dlx - (dx?dx*(dlx/dx):0),
-          ndly = dly - (dx?dx*(dly/dx):0);
-        int errlx = dx>>1, errly = errlx;
-        if (xleft<0 && dx) {
-          lxleft-=xleft*(lxright - lxleft)/dx;
-          lyleft-=xleft*(lyright - lyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const tc *col = color;
-          const tl *lig = &light._atXY(lxleft,lyleft);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            *ptrd = (T)(l<1?l**(col++):((2 - l)**(col++) + (l - 1)*maxval));
-            ptrd+=whd; lig+=lwh;
-          }
-          ptrd-=offx;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-        } else  for (int x = xleft; x<=xright; ++x) {
-          const tc *col = color;
-          const tl *lig = &light._atXY(lxleft,lyleft);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            const T val = (T)(l<1?l**(col++):((2 - l)**(col++) + (l - 1)*maxval));
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd; lig+=lwh;
-          }
-          ptrd-=offx;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a Phong-shaded 2d triangle, with z-buffering.
-    template<typename tz, typename tc, typename tl>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const tc *const color,
-                           const CImg<tl>& light,
-                           const int lx0, const int ly0,
-                           const int lx1, const int ly1,
-                           const int lx2, const int ly2,
-                           const float opacity=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Specified color is (null).",
-                                    cimg_instance);
-      if (light._depth>1 || light._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified light texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      if (is_overlapped(light)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,
-                                                     +light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        lwh = (ulongT)light._width*light._height,
-        offx = _spectrum*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nlx0,nlx1,nly0,nly1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nlx0,nlx2,nly0,nly2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nlx1,nlx2,nly1,nly2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
-                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
-        if (y==ny1) { zl = nz1; pzl = pzn; }
-        int
-          xleft = xleft0, xright = xright0,
-          lxleft = lxleft0, lxright = lxright0,
-          lyleft = lyleft0, lyright = lyright0;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,lxleft,lxright,lyleft,lyright);
-        const int
-          dx = xright - xleft,
-          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
-          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
-          rlx = dx?(lxright - lxleft)/dx:0,
-          rly = dx?(lyright - lyleft)/dx:0,
-          slx = lxright>lxleft?1:-1,
-          sly = lyright>lyleft?1:-1,
-          ndlx = dlx - (dx?dx*(dlx/dx):0),
-          ndly = dly - (dx?dx*(dly/dx):0);
-        const tzfloat pentez = (zright - zleft)/dx;
-        int errlx = dx>>1, errly = errlx;
-        if (xleft<0 && dx) {
-          zleft-=xleft*(zright - zleft)/dx;
-          lxleft-=xleft*(lxright - lxleft)/dx;
-          lyleft-=xleft*(lyright - lyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T *ptrd = data(xleft,y,0,0);
-        tz *ptrz = xleft<=xright?zbuffer.data(xleft,y):0;
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tc *col = color;
-              const tl *lig = &light._atXY(lxleft,lyleft);
-              cimg_forC(*this,c) {
-                const tl l = *lig;
-                const tc cval = *(col++);
-                *ptrd = (T)(l<1?l*cval:(2 - l)*cval + (l - 1)*maxval);
-                ptrd+=whd; lig+=lwh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tc *col = color;
-              const tl *lig = &light._atXY(lxleft,lyleft);
-              cimg_forC(*this,c) {
-                const tl l = *lig;
-                const tc cval = *(col++);
-                const T val = (T)(l<1?l*cval:(2 - l)*cval + (l - 1)*maxval);
-                *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                ptrd+=whd; lig+=lwh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez;
-            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          }
-        zr+=pzr; zl+=pzl;
-      }
-      return *this;
-    }
-
-    //! Draw a textured Gouraud-shaded 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param texture Texture image used to fill the triangle.
-       \param tx0 X-coordinate of the first vertex in the texture image.
-       \param ty0 Y-coordinate of the first vertex in the texture image.
-       \param tx1 X-coordinate of the second vertex in the texture image.
-       \param ty1 Y-coordinate of the second vertex in the texture image.
-       \param tx2 X-coordinate of the third vertex in the texture image.
-       \param ty2 Y-coordinate of the third vertex in the texture image.
-       \param brightness0 Brightness factor of the first vertex.
-       \param brightness1 Brightness factor of the second vertex.
-       \param brightness2 Brightness factor of the third vertex.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float brightness0,
-                           const float brightness1,
-                           const float brightness2,
-                           const float opacity=1) {
-      if (is_empty()) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
-                             brightness0,brightness1,brightness2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2,
-        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
-        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
-        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nc0,nc1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nc0,nc2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nc1,nc2);
-      if (ny0>=height() || ny2<0) return *this;
-      _cimg_for_triangle4(*this,xleft0,cleft0,txleft0,tyleft0,xright0,cright0,txright0,tyright0,y,
-                          nx0,ny0,nc0,ntx0,nty0,nx1,ny1,nc1,ntx1,nty1,nx2,ny2,nc2,ntx2,nty2) {
-        int
-          xleft = xleft0, xright = xright0,
-          cleft = cleft0, cright = cright0,
-          txleft = txleft0, txright = txright0,
-          tyleft = tyleft0, tyright = tyright0;
-        if (xright<xleft) cimg::swap(xleft,xright,cleft,cright,txleft,txright,tyleft,tyright);
-        const int
-          dx = xright - xleft,
-          dc = cright>cleft?cright - cleft:cleft - cright,
-          dtx = txright>txleft?txright - txleft:txleft - txright,
-          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
-          rc = dx?(cright - cleft)/dx:0,
-          rtx = dx?(txright - txleft)/dx:0,
-          rty = dx?(tyright - tyleft)/dx:0,
-          sc = cright>cleft?1:-1,
-          stx = txright>txleft?1:-1,
-          sty = tyright>tyleft?1:-1,
-          ndc = dc - (dx?dx*(dc/dx):0),
-          ndtx = dtx - (dx?dx*(dtx/dx):0),
-          ndty = dty - (dx?dx*(dty/dx):0);
-        int errc = dx>>1, errtx = errc, errty = errc;
-        if (xleft<0 && dx) {
-          cleft-=xleft*(cright - cleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const tc *col = &texture._atXY(txleft,tyleft);
-          cimg_forC(*this,c) {
-            *ptrd = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-            ptrd+=whd; col+=twh;
-          }
-          ptrd-=offx;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-        } else for (int x = xleft; x<=xright; ++x) {
-          const tc *col = &texture._atXY(txleft,tyleft);
-          cimg_forC(*this,c) {
-            const T val = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd; col+=twh;
-          }
-          ptrd-=offx;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a textured Gouraud-shaded 2d triangle, with perspective correction \overloading.
-    template<typename tc>
-    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float brightness0,
-                           const float brightness1,
-                           const float brightness2,
-                           const float opacity=1) {
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture)) return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
-                                                       brightness0,brightness1,brightness2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
-        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
-        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2,
-        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1,nc0,nc1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2,nc0,nc2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2,nc1,nc2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int
-          xleft = xleft0, xright = xright0,
-          cleft = cleft0, cright = cright0;
-        float
-          zleft = zl, zright = zr,
-          txleft = txl, txright = txr,
-          tyleft = tyl, tyright = tyr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,cleft,cright);
-        const int
-          dx = xright - xleft,
-          dc = cright>cleft?cright - cleft:cleft - cright,
-          rc = dx?(cright - cleft)/dx:0,
-          sc = cright>cleft?1:-1,
-          ndc = dc - (dx?dx*(dc/dx):0);
-        const float
-          pentez = (zright - zleft)/dx,
-          pentetx = (txright - txleft)/dx,
-          pentety = (tyright - tyleft)/dx;
-        int errc = dx>>1;
-        if (xleft<0 && dx) {
-          cleft-=xleft*(cright - cleft)/dx;
-          zleft-=xleft*(zright - zleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const float invz = 1/zleft;
-          const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-          cimg_forC(*this,c) {
-            *ptrd = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-            ptrd+=whd; col+=twh;
-          }
-          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-        } else for (int x = xleft; x<=xright; ++x) {
-          const float invz = 1/zleft;
-          const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-          cimg_forC(*this,c) {
-            const T val = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd; col+=twh;
-          }
-          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-        }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a textured Gouraud-shaded 2d triangle, with perspective correction and z-buffering \overloading.
-    template<typename tz, typename tc>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const float brightness0,
-                           const float brightness1,
-                           const float brightness2,
-                           const float opacity=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (is_overlapped(texture))
-        return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
-                                                       brightness0,brightness1,brightness2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        offx = _spectrum*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
-        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
-        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2;
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1,nc0,nc1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2,nc0,nc2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2,nc1,nc2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
-        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,cleft,cright);
-        const int
-          dx = xright - xleft,
-          dc = cright>cleft?cright - cleft:cleft - cright,
-          rc = dx?(cright - cleft)/dx:0,
-          sc = cright>cleft?1:-1,
-          ndc = dc - (dx?dx*(dc/dx):0);
-        float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
-        const tzfloat pentez = (zright - zleft)/dx;
-        int errc = dx>>1;
-        if (xleft<0 && dx) {
-          cleft-=xleft*(cright - cleft)/dx;
-          zleft-=xleft*(zright - zleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y);
-        tz *ptrz = zbuffer.data(xleft,y);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tzfloat invz = 1/zleft;
-              const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-              cimg_forC(*this,c) {
-                *ptrd = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-                ptrd+=whd; col+=twh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          } else for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tzfloat invz = 1/zleft;
-              const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-              cimg_forC(*this,c) {
-                const T val = (T)(cleft<256?cleft**col/256:((512 - cleft)**col + (cleft - 256)*maxval)/256);
-                *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                ptrd+=whd; col+=twh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
-          }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a textured Phong-shaded 2d triangle.
-    /**
-       \param x0 X-coordinate of the first vertex in the image instance.
-       \param y0 Y-coordinate of the first vertex in the image instance.
-       \param x1 X-coordinate of the second vertex in the image instance.
-       \param y1 Y-coordinate of the second vertex in the image instance.
-       \param x2 X-coordinate of the third vertex in the image instance.
-       \param y2 Y-coordinate of the third vertex in the image instance.
-       \param texture Texture image used to fill the triangle.
-       \param tx0 X-coordinate of the first vertex in the texture image.
-       \param ty0 Y-coordinate of the first vertex in the texture image.
-       \param tx1 X-coordinate of the second vertex in the texture image.
-       \param ty1 Y-coordinate of the second vertex in the texture image.
-       \param tx2 X-coordinate of the third vertex in the texture image.
-       \param ty2 Y-coordinate of the third vertex in the texture image.
-       \param light Light image.
-       \param lx0 X-coordinate of the first vertex in the light image.
-       \param ly0 Y-coordinate of the first vertex in the light image.
-       \param lx1 X-coordinate of the second vertex in the light image.
-       \param ly1 Y-coordinate of the second vertex in the light image.
-       \param lx2 X-coordinate of the third vertex in the light image.
-       \param ly2 Y-coordinate of the third vertex in the light image.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc, typename tl>
-    CImg<T>& draw_triangle(const int x0, const int y0,
-                           const int x1, const int y1,
-                           const int x2, const int y2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const CImg<tl>& light,
-                           const int lx0, const int ly0,
-                           const int lx1, const int ly1,
-                           const int lx2, const int ly2,
-                           const float opacity=1) {
-      if (is_empty()) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (light._depth>1 || light._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified light texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
-      if (is_overlapped(texture))
-        return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      if (is_overlapped(light))
-        return draw_triangle(x0,y0,x1,y1,x2,y2,texture,tx0,ty0,tx1,ty1,tx2,ty2,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        lwh = (ulongT)light._width*light._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2,
-        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2);
-      if (ny0>=height() || ny2<0) return *this;
-      const bool is_bump = texture._spectrum>=_spectrum + 2;
-      const ulongT obx = twh*_spectrum, oby = twh*(_spectrum + 1);
-
-      _cimg_for_triangle5(*this,xleft0,lxleft0,lyleft0,txleft0,tyleft0,xright0,lxright0,lyright0,txright0,tyright0,y,
-                          nx0,ny0,nlx0,nly0,ntx0,nty0,nx1,ny1,nlx1,nly1,ntx1,nty1,nx2,ny2,nlx2,nly2,ntx2,nty2) {
-        int
-          xleft = xleft0, xright = xright0,
-          lxleft = lxleft0, lxright = lxright0,
-          lyleft = lyleft0, lyright = lyright0,
-          txleft = txleft0, txright = txright0,
-          tyleft = tyleft0, tyright = tyright0;
-        if (xright<xleft) cimg::swap(xleft,xright,lxleft,lxright,lyleft,lyright,txleft,txright,tyleft,tyright);
-        const int
-          dx = xright - xleft,
-          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
-          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
-          dtx = txright>txleft?txright - txleft:txleft - txright,
-          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
-          rlx = dx?(lxright - lxleft)/dx:0,
-          rly = dx?(lyright - lyleft)/dx:0,
-          rtx = dx?(txright - txleft)/dx:0,
-          rty = dx?(tyright - tyleft)/dx:0,
-          slx = lxright>lxleft?1:-1,
-          sly = lyright>lyleft?1:-1,
-          stx = txright>txleft?1:-1,
-          sty = tyright>tyleft?1:-1,
-          ndlx = dlx - (dx?dx*(dlx/dx):0),
-          ndly = dly - (dx?dx*(dly/dx):0),
-          ndtx = dtx - (dx?dx*(dtx/dx):0),
-          ndty = dty - (dx?dx*(dty/dx):0);
-        int errlx = dx>>1, errly = errlx, errtx = errlx, errty = errlx;
-        if (xleft<0 && dx) {
-          lxleft-=xleft*(lxright - lxleft)/dx;
-          lyleft-=xleft*(lyright - lyleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const tc *col = &texture._atXY(txleft,tyleft);
-          const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-          const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            *ptrd = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-            ptrd+=whd; col+=twh; lig+=lwh;
-          }
-          ptrd-=offx;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-        } else for (int x = xleft; x<=xright; ++x) {
-          const tc *col = &texture._atXY(txleft,tyleft);
-          const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-          const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            const T val = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd; col+=twh; lig+=lwh;
-          }
-          ptrd-=offx;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
-          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a textured Phong-shaded 2d triangle, with perspective correction.
-    template<typename tc, typename tl>
-    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const CImg<tl>& light,
-                           const int lx0, const int ly0,
-                           const int lx1, const int ly1,
-                           const int lx2, const int ly2,
-                           const float opacity=1) {
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (light._depth>1 || light._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified light texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
-      if (is_overlapped(texture))
-        return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
-                             light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      if (is_overlapped(light))
-        return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,texture,tx0,ty0,tx1,ty1,tx2,ty2,
-                             +light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        lwh = (ulongT)light._width*light._height,
-        offx = _spectrum*whd - 1;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2,
-        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      const bool is_bump = texture._spectrum>=_spectrum + 2;
-      const ulongT obx = twh*_spectrum, oby = twh*(_spectrum + 1);
-
-      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
-                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int
-          xleft = xleft0, xright = xright0,
-          lxleft = lxleft0, lxright = lxright0,
-          lyleft = lyleft0, lyright = lyright0;
-        float
-          zleft = zl, zright = zr,
-          txleft = txl, txright = txr,
-          tyleft = tyl, tyright = tyr;
-        if (xright<xleft)
-          cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,lxleft,lxright,lyleft,lyright);
-        const int
-          dx = xright - xleft,
-          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
-          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
-          rlx = dx?(lxright - lxleft)/dx:0,
-          rly = dx?(lyright - lyleft)/dx:0,
-          slx = lxright>lxleft?1:-1,
-          sly = lyright>lyleft?1:-1,
-          ndlx = dlx - (dx?dx*(dlx/dx):0),
-          ndly = dly - (dx?dx*(dly/dx):0);
-        const float
-          pentez = (zright - zleft)/dx,
-          pentetx = (txright - txleft)/dx,
-          pentety = (tyright - tyleft)/dx;
-        int errlx = dx>>1, errly = errlx;
-        if (xleft<0 && dx) {
-          zleft-=xleft*(zright - zleft)/dx;
-          lxleft-=xleft*(lxright - lxleft)/dx;
-          lyleft-=xleft*(lyright - lyleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y,0,0);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
-          const float invz = 1/zleft;
-          const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-          const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-          const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            *ptrd = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-            ptrd+=whd; col+=twh; lig+=lwh;
-          }
-          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-        } else for (int x = xleft; x<=xright; ++x) {
-          const float invz = 1/zleft;
-          const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-          const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-          const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-          cimg_forC(*this,c) {
-            const tl l = *lig;
-            const T val = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-            *ptrd = (T)(nopacity*val + *ptrd*copacity);
-            ptrd+=whd; col+=twh; lig+=lwh;
-          }
-          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-        }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a textured Phong-shaded 2d triangle, with perspective correction and z-buffering.
-    template<typename tz, typename tc, typename tl>
-    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
-                           const int x0, const int y0, const float z0,
-                           const int x1, const int y1, const float z1,
-                           const int x2, const int y2, const float z2,
-                           const CImg<tc>& texture,
-                           const int tx0, const int ty0,
-                           const int tx1, const int ty1,
-                           const int tx2, const int ty2,
-                           const CImg<tl>& light,
-                           const int lx0, const int ly0,
-                           const int lx1, const int ly1,
-                           const int lx2, const int ly2,
-                           const float opacity=1) {
-      typedef typename cimg::superset<tz,float>::type tzfloat;
-      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
-      if (!is_sameXY(zbuffer))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Instance and specified Z-buffer (%u,%u,%u,%u,%p) have "
-                                    "different dimensions.",
-                                    cimg_instance,
-                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
-      if (texture._depth>1 || texture._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
-      if (light._depth>1 || light._spectrum<_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_triangle(): Invalid specified light texture (%u,%u,%u,%u,%p).",
-                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
-      if (is_overlapped(texture))
-        return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,
-                             +texture,tx0,ty0,tx1,ty1,tx2,ty2,light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      if (is_overlapped(light))
-        return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,
-                             texture,tx0,ty0,tx1,ty1,tx2,ty2,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-      static const T maxval = (T)std::min(cimg::type<T>::max(),(T)cimg::type<tc>::max());
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT
-        whd = (ulongT)_width*_height*_depth,
-        twh = (ulongT)texture._width*texture._height,
-        lwh = (ulongT)light._width*light._height,
-        offx = _spectrum*whd;
-      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
-        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
-      float
-        ntx0 = tx0/z0, nty0 = ty0/z0,
-        ntx1 = tx1/z1, nty1 = ty1/z1,
-        ntx2 = tx2/z2, nty2 = ty2/z2;
-      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
-      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1,nz0,nz1);
-      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2,nz0,nz2);
-      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2,nz1,nz2);
-      if (ny0>=height() || ny2<0) return *this;
-      float
-        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
-        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
-        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
-        ptyl = (nty1 - nty0)/(ny1 - ny0),
-        ptyr = (nty2 - nty0)/(ny2 - ny0),
-        ptyn = (nty2 - nty1)/(ny2 - ny1),
-        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
-        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
-        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):
-          (ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
-        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):
-          (ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
-      tzfloat
-        pzl = (nz1 - nz0)/(ny1 - ny0),
-        pzr = (nz2 - nz0)/(ny2 - ny0),
-        pzn = (nz2 - nz1)/(ny2 - ny1),
-        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
-        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
-      const bool is_bump = texture._spectrum>=_spectrum + 2;
-      const ulongT obx = twh*_spectrum, oby = twh*(_spectrum + 1);
-
-      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
-                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
-        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
-        int
-          xleft = xleft0, xright = xright0,
-          lxleft = lxleft0, lxright = lxright0,
-          lyleft = lyleft0, lyright = lyright0;
-        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
-        tzfloat zleft = zl, zright = zr;
-        if (xright<xleft)
-          cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,lxleft,lxright,lyleft,lyright);
-        const int
-          dx = xright - xleft,
-          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
-          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
-          rlx = dx?(lxright - lxleft)/dx:0,
-          rly = dx?(lyright - lyleft)/dx:0,
-          slx = lxright>lxleft?1:-1,
-          sly = lyright>lyleft?1:-1,
-          ndlx = dlx - (dx?dx*(dlx/dx):0),
-          ndly = dly - (dx?dx*(dly/dx):0);
-        float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
-        const tzfloat pentez = (zright - zleft)/dx;
-        int errlx = dx>>1, errly = errlx;
-        if (xleft<0 && dx) {
-          zleft-=xleft*(zright - zleft)/dx;
-          lxleft-=xleft*(lxright - lxleft)/dx;
-          lyleft-=xleft*(lyright - lyleft)/dx;
-          txleft-=xleft*(txright - txleft)/dx;
-          tyleft-=xleft*(tyright - tyleft)/dx;
-        }
-        if (xleft<0) xleft = 0;
-        if (xright>=width() - 1) xright = width() - 1;
-        T* ptrd = data(xleft,y);
-        tz *ptrz = zbuffer.data(xleft,y);
-        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tzfloat invz = 1/zleft;
-              const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-              const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-              const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-              cimg_forC(*this,c) {
-                const tl l = *lig;
-                *ptrd = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-                ptrd+=whd; col+=twh; lig+=lwh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
-            if (zleft>=(tzfloat)*ptrz) {
-              *ptrz = (tz)zleft;
-              const tzfloat invz = 1/zleft;
-              const tc *col = &texture._atXY((int)(txleft*invz),(int)(tyleft*invz));
-              const int bx = is_bump?128 - (int)col[obx]:0, by = is_bump?128 - (int)col[oby]:0;
-              const tl *lig = &light._atXY(lxleft + bx,lyleft + by);
-              cimg_forC(*this,c) {
-                const tl l = *lig;
-                const T val = (T)(l<1?l**col:(2 - l)**col + (l - 1)*maxval);
-                *ptrd = (T)(nopacity*val + *ptrd*copacity);
-                ptrd+=whd; col+=twh; lig+=lwh;
-              }
-              ptrd-=offx;
-            }
-            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
-            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
-            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
-          }
-        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
-      }
-      return *this;
-    }
-
-    //! Draw a filled 4d rectangle.
-    /**
-       \param x0 X-coordinate of the upper-left rectangle corner.
-       \param y0 Y-coordinate of the upper-left rectangle corner.
-       \param z0 Z-coordinate of the upper-left rectangle corner.
-       \param c0 C-coordinate of the upper-left rectangle corner.
-       \param x1 X-coordinate of the lower-right rectangle corner.
-       \param y1 Y-coordinate of the lower-right rectangle corner.
-       \param z1 Z-coordinate of the lower-right rectangle corner.
-       \param c1 C-coordinate of the lower-right rectangle corner.
-       \param val Scalar value used to fill the rectangle area.
-       \param opacity Drawing opacity.
-    **/
-    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0, const int c0,
-                            const int x1, const int y1, const int z1, const int c1,
-                            const T val, const float opacity=1) {
-      if (is_empty()) return *this;
-      const int
-        nx0 = x0<x1?x0:x1, nx1 = x0^x1^nx0,
-        ny0 = y0<y1?y0:y1, ny1 = y0^y1^ny0,
-        nz0 = z0<z1?z0:z1, nz1 = z0^z1^nz0,
-        nc0 = c0<c1?c0:c1, nc1 = c0^c1^nc0;
-      const int
-        lX = (1 + nx1 - nx0) + (nx1>=width()?width() - 1 - nx1:0) + (nx0<0?nx0:0),
-        lY = (1 + ny1 - ny0) + (ny1>=height()?height() - 1 - ny1:0) + (ny0<0?ny0:0),
-        lZ = (1 + nz1 - nz0) + (nz1>=depth()?depth() - 1 - nz1:0) + (nz0<0?nz0:0),
-        lC = (1 + nc1 - nc0) + (nc1>=spectrum()?spectrum() - 1 - nc1:0) + (nc0<0?nc0:0);
-      const ulongT
-        offX = (ulongT)_width - lX,
-        offY = (ulongT)_width*(_height - lY),
-        offZ = (ulongT)_width*_height*(_depth - lZ);
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      T *ptrd = data(nx0<0?0:nx0,ny0<0?0:ny0,nz0<0?0:nz0,nc0<0?0:nc0);
-      if (lX>0 && lY>0 && lZ>0 && lC>0)
-        for (int v = 0; v<lC; ++v) {
-          for (int z = 0; z<lZ; ++z) {
-            for (int y = 0; y<lY; ++y) {
-              if (opacity>=1) {
-                if (sizeof(T)!=1) { for (int x = 0; x<lX; ++x) *(ptrd++) = val; ptrd+=offX; }
-                else { std::memset(ptrd,(int)val,lX); ptrd+=_width; }
-              } else { for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*val + *ptrd*copacity); ++ptrd; } ptrd+=offX; }
-            }
-            ptrd+=offY;
-          }
-          ptrd+=offZ;
-        }
-      return *this;
-    }
-
-    //! Draw a filled 3d rectangle.
-    /**
-       \param x0 X-coordinate of the upper-left rectangle corner.
-       \param y0 Y-coordinate of the upper-left rectangle corner.
-       \param z0 Z-coordinate of the upper-left rectangle corner.
-       \param x1 X-coordinate of the lower-right rectangle corner.
-       \param y1 Y-coordinate of the lower-right rectangle corner.
-       \param z1 Z-coordinate of the lower-right rectangle corner.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0,
-                            const int x1, const int y1, const int z1,
-                            const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_rectangle(): Specified color is (null).",
-                                    cimg_instance);
-      cimg_forC(*this,c) draw_rectangle(x0,y0,z0,c,x1,y1,z1,c,(T)color[c],opacity);
-      return *this;
-    }
-
-    //! Draw an outlined 3d rectangle \overloading.
-    template<typename tc>
-    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0,
-                            const int x1, const int y1, const int z1,
-                            const tc *const color, const float opacity,
-                            const unsigned int pattern) {
-      return draw_line(x0,y0,z0,x1,y0,z0,color,opacity,pattern,true).
-        draw_line(x1,y0,z0,x1,y1,z0,color,opacity,pattern,false).
-        draw_line(x1,y1,z0,x0,y1,z0,color,opacity,pattern,false).
-        draw_line(x0,y1,z0,x0,y0,z0,color,opacity,pattern,false).
-        draw_line(x0,y0,z1,x1,y0,z1,color,opacity,pattern,true).
-        draw_line(x1,y0,z1,x1,y1,z1,color,opacity,pattern,false).
-        draw_line(x1,y1,z1,x0,y1,z1,color,opacity,pattern,false).
-        draw_line(x0,y1,z1,x0,y0,z1,color,opacity,pattern,false).
-        draw_line(x0,y0,z0,x0,y0,z1,color,opacity,pattern,true).
-        draw_line(x1,y0,z0,x1,y0,z1,color,opacity,pattern,true).
-        draw_line(x1,y1,z0,x1,y1,z1,color,opacity,pattern,true).
-        draw_line(x0,y1,z0,x0,y1,z1,color,opacity,pattern,true);
-    }
-
-    //! Draw a filled 2d rectangle.
-    /**
-       \param x0 X-coordinate of the upper-left rectangle corner.
-       \param y0 Y-coordinate of the upper-left rectangle corner.
-       \param x1 X-coordinate of the lower-right rectangle corner.
-       \param y1 Y-coordinate of the lower-right rectangle corner.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_rectangle(const int x0, const int y0,
-                            const int x1, const int y1,
-                            const tc *const color, const float opacity=1) {
-      return draw_rectangle(x0,y0,0,x1,y1,_depth - 1,color,opacity);
-    }
-
-    //! Draw a outlined 2d rectangle \overloading.
-    template<typename tc>
-    CImg<T>& draw_rectangle(const int x0, const int y0,
-                            const int x1, const int y1,
-                            const tc *const color, const float opacity,
-                            const unsigned int pattern) {
-      if (is_empty()) return *this;
-      if (y0==y1) return draw_line(x0,y0,x1,y0,color,opacity,pattern,true);
-      if (x0==x1) return draw_line(x0,y0,x0,y1,color,opacity,pattern,true);
-      const int
-        nx0 = x0<x1?x0:x1, nx1 = x0^x1^nx0,
-        ny0 = y0<y1?y0:y1, ny1 = y0^y1^ny0;
-      if (ny1==ny0 + 1) return draw_line(nx0,ny0,nx1,ny0,color,opacity,pattern,true).
-                      draw_line(nx1,ny1,nx0,ny1,color,opacity,pattern,false);
-      return draw_line(nx0,ny0,nx1,ny0,color,opacity,pattern,true).
-        draw_line(nx1,ny0 + 1,nx1,ny1 - 1,color,opacity,pattern,false).
-        draw_line(nx1,ny1,nx0,ny1,color,opacity,pattern,false).
-        draw_line(nx0,ny1 - 1,nx0,ny0 + 1,color,opacity,pattern,false);
-    }
-
-    //! Draw a filled 2d polygon.
-    /**
-       \param points Set of polygon vertices.
-       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
-       \param opacity Drawing opacity.
-     **/
-    template<typename tp, typename tc>
-    CImg<T>& draw_polygon(const CImg<tp>& points,
-                          const tc *const color, const float opacity=1) {
-      if (is_empty() || !points) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_polygon(): Specified color is (null).",
-                                    cimg_instance);
-      if (points._width==1) return draw_point((int)points(0,0),(int)points(0,1),color,opacity);
-      if (points._width==2) return draw_line((int)points(0,0),(int)points(0,1),
-                                             (int)points(1,0),(int)points(1,1),color,opacity);
-      if (points._width==3) return draw_triangle((int)points(0,0),(int)points(0,1),
-                                                 (int)points(1,0),(int)points(1,1),
-                                                 (int)points(2,0),(int)points(2,1),color,opacity);
-      cimg_init_scanline(color,opacity);
-      int
-        xmin = 0, ymin = 0,
-        xmax = points.get_shared_row(0).max_min(xmin),
-        ymax = points.get_shared_row(1).max_min(ymin);
-      if (xmax<0 || xmin>=width() || ymax<0 || ymin>=height()) return *this;
-      if (ymin==ymax) return draw_line(xmin,ymin,xmax,ymax,color,opacity);
-
-      ymin = std::max(0,ymin);
-      ymax = std::min(height() - 1,ymax);
-      CImg<intT> Xs(points._width,ymax - ymin + 1);
-      CImg<uintT> count(Xs._height,1,1,1,0);
-      unsigned int n = 0, nn = 1;
-      bool go_on = true;
-
-      while (go_on) {
-        unsigned int an = (nn + 1)%points._width;
-        const int
-          x0 = (int)points(n,0),
-          y0 = (int)points(n,1);
-        if (points(nn,1)==y0) while (points(an,1)==y0) { nn = an; (an+=1)%=points._width; }
-        const int
-          x1 = (int)points(nn,0),
-          y1 = (int)points(nn,1);
-        unsigned int tn = an;
-        while (points(tn,1)==y1) (tn+=1)%=points._width;
-
-        if (y0!=y1) {
-          const int
-            y2 = (int)points(tn,1),
-            x01 = x1 - x0, y01 = y1 - y0, y12 = y2 - y1,
-            dy = cimg::sign(y01),
-            tmax = std::max(1,cimg::abs(y01)),
-            tend = tmax - (dy==cimg::sign(y12));
-          unsigned int y = (unsigned int)y0 - ymin;
-          for (int t = 0; t<=tend; ++t, y+=dy)
-            if (y<Xs._height) Xs(count[y]++,y) = x0 + t*x01/tmax;
-        }
-
-        go_on = nn>n;
-        n = nn;
-        nn = an;
-      }
-
-      cimg_pragma_openmp(parallel for cimg_openmp_if(Xs._height>32))
-      cimg_forY(Xs,y) {
-        const CImg<intT> Xsy = Xs.get_shared_points(0,count[y] - 1,y).sort();
-        int px = width();
-        for (unsigned int n = 0; n<Xsy._width; n+=2) {
-          int x0 = Xsy[n];
-          const int x1 = Xsy[n + 1];
-          x0+=x0==px;
-          cimg_draw_scanline(x0,x1,y + ymin,color,opacity,1);
-          px = x1;
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a outlined 2d polygon \overloading.
-    template<typename t, typename tc>
-    CImg<T>& draw_polygon(const CImg<t>& points,
-                          const tc *const color, const float opacity, const unsigned int pattern) {
-      if (is_empty() || !points || points._width<3) return *this;
-      bool ninit_hatch = true;
-      switch (points._height) {
-      case 0 : case 1 :
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_polygon(): Invalid specified point set.",
-                                    cimg_instance);
-      case 2 : { // 2d version.
-        CImg<intT> npoints(points._width,2);
-        int x = npoints(0,0) = (int)points(0,0), y = npoints(0,1) = (int)points(0,1);
-        unsigned int nb_points = 1;
-        for (unsigned int p = 1; p<points._width; ++p) {
-          const int nx = (int)points(p,0), ny = (int)points(p,1);
-          if (nx!=x || ny!=y) { npoints(nb_points,0) = nx; npoints(nb_points++,1) = ny; x = nx; y = ny; }
-        }
-        const int x0 = (int)npoints(0,0), y0 = (int)npoints(0,1);
-        int ox = x0, oy = y0;
-        for (unsigned int i = 1; i<nb_points; ++i) {
-          const int x = (int)npoints(i,0), y = (int)npoints(i,1);
-          draw_line(ox,oy,x,y,color,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y;
-        }
-        draw_line(ox,oy,x0,y0,color,opacity,pattern,false);
-      } break;
-      default : { // 3d version.
-        CImg<intT> npoints(points._width,3);
-        int
-          x = npoints(0,0) = (int)points(0,0),
-          y = npoints(0,1) = (int)points(0,1),
-          z = npoints(0,2) = (int)points(0,2);
-        unsigned int nb_points = 1;
-        for (unsigned int p = 1; p<points._width; ++p) {
-          const int nx = (int)points(p,0), ny = (int)points(p,1), nz = (int)points(p,2);
-          if (nx!=x || ny!=y || nz!=z) {
-            npoints(nb_points,0) = nx; npoints(nb_points,1) = ny; npoints(nb_points++,2) = nz;
-            x = nx; y = ny; z = nz;
-          }
-        }
-        const int x0 = (int)npoints(0,0), y0 = (int)npoints(0,1), z0 = (int)npoints(0,2);
-        int ox = x0, oy = y0, oz = z0;
-        for (unsigned int i = 1; i<nb_points; ++i) {
-          const int x = (int)npoints(i,0), y = (int)npoints(i,1), z = (int)npoints(i,2);
-          draw_line(ox,oy,oz,x,y,z,color,opacity,pattern,ninit_hatch);
-          ninit_hatch = false;
-          ox = x; oy = y; oz = z;
-        }
-        draw_line(ox,oy,oz,x0,y0,z0,color,opacity,pattern,false);
-      }
-      }
-      return *this;
-    }
-
-    //! Draw a filled 2d ellipse.
-    /**
-       \param x0 X-coordinate of the ellipse center.
-       \param y0 Y-coordinate of the ellipse center.
-       \param r1 First radius of the ellipse.
-       \param r2 Second radius of the ellipse.
-       \param angle Angle of the first radius.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
-                          const tc *const color, const float opacity=1) {
-      return _draw_ellipse(x0,y0,r1,r2,angle,color,opacity,0U);
-    }
-
-    //! Draw a filled 2d ellipse \overloading.
-    /**
-       \param x0 X-coordinate of the ellipse center.
-       \param y0 Y-coordinate of the ellipse center.
-       \param tensor Diffusion tensor describing the ellipse.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_ellipse(const int x0, const int y0, const CImg<t> &tensor,
-                          const tc *const color, const float opacity=1) {
-      CImgList<t> eig = tensor.get_symmetric_eigen();
-      const CImg<t> &val = eig[0], &vec = eig[1];
-      return draw_ellipse(x0,y0,std::sqrt(val(0)),std::sqrt(val(1)),
-                          std::atan2(vec(0,1),vec(0,0))*180/cimg::PI,
-                          color,opacity);
-    }
-
-    //! Draw an outlined 2d ellipse.
-    /**
-       \param x0 X-coordinate of the ellipse center.
-       \param y0 Y-coordinate of the ellipse center.
-       \param r1 First radius of the ellipse.
-       \param r2 Second radius of the ellipse.
-       \param angle Angle of the first radius.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the outline pattern.
-    **/
-    template<typename tc>
-    CImg<T>& draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
-                          const tc *const color, const float opacity, const unsigned int pattern) {
-      if (pattern) _draw_ellipse(x0,y0,r1,r2,angle,color,opacity,pattern);
-      return *this;
-    }
-
-    //! Draw an outlined 2d ellipse \overloading.
-    /**
-       \param x0 X-coordinate of the ellipse center.
-       \param y0 Y-coordinate of the ellipse center.
-       \param tensor Diffusion tensor describing the ellipse.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the outline pattern.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_ellipse(const int x0, const int y0, const CImg<t> &tensor,
-                          const tc *const color, const float opacity,
-                          const unsigned int pattern) {
-      CImgList<t> eig = tensor.get_symmetric_eigen();
-      const CImg<t> &val = eig[0], &vec = eig[1];
-      return draw_ellipse(x0,y0,std::sqrt(val(0)),std::sqrt(val(1)),
-                          std::atan2(vec(0,1),vec(0,0))*180/cimg::PI,
-                          color,opacity,pattern);
-    }
-
-    template<typename tc>
-    CImg<T>& _draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
-                           const tc *const color, const float opacity,
-                           const unsigned int pattern) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_ellipse(): Specified color is (null).",
-                                    cimg_instance);
-      if (r1<=0 || r2<=0) return draw_point(x0,y0,color,opacity);
-      if (r1==r2 && (float)(int)r1==r1) {
-        if (pattern) return draw_circle(x0,y0,r1,color,opacity,pattern);
-        else return draw_circle(x0,y0,r1,color,opacity);
-      }
-      cimg_init_scanline(color,opacity);
-      const float
-        nr1 = cimg::abs(r1) - 0.5, nr2 = cimg::abs(r2) - 0.5,
-        nangle = (float)(angle*cimg::PI/180),
-        u = (float)std::cos(nangle),
-        v = (float)std::sin(nangle),
-        rmax = std::max(nr1,nr2),
-        l1 = (float)std::pow(rmax/(nr1>0?nr1:1e-6),2),
-        l2 = (float)std::pow(rmax/(nr2>0?nr2:1e-6),2),
-        a = l1*u*u + l2*v*v,
-        b = u*v*(l1 - l2),
-        c = l1*v*v + l2*u*u;
-      const int
-        yb = (int)std::sqrt(a*rmax*rmax/(a*c - b*b)),
-        tymin = y0 - yb - 1,
-        tymax = y0 + yb + 1,
-        ymin = tymin<0?0:tymin,
-        ymax = tymax>=height()?height() - 1:tymax;
-      int oxmin = 0, oxmax = 0;
-      bool first_line = true;
-      for (int y = ymin; y<=ymax; ++y) {
-        const float
-          Y = y - y0 + (y<y0?0.5f:-0.5f),
-          delta = b*b*Y*Y - a*(c*Y*Y - rmax*rmax),
-          sdelta = delta>0?(float)std::sqrt(delta)/a:0.0f,
-          bY = b*Y/a,
-          fxmin = x0 - 0.5f - bY - sdelta,
-          fxmax = x0 + 0.5f - bY + sdelta;
-        const int xmin = (int)cimg::round(fxmin), xmax = (int)cimg::round(fxmax);
-        if (!pattern) cimg_draw_scanline(xmin,xmax,y,color,opacity,1);
-        else {
-          if (first_line) {
-            if (y0 - yb>=0) cimg_draw_scanline(xmin,xmax,y,color,opacity,1);
-            else draw_point(xmin,y,color,opacity).draw_point(xmax,y,color,opacity);
-            first_line = false;
-          } else {
-            if (xmin<oxmin) cimg_draw_scanline(xmin,oxmin - 1,y,color,opacity,1);
-            else cimg_draw_scanline(oxmin + (oxmin==xmin?0:1),xmin,y,color,opacity,1);
-            if (xmax<oxmax) cimg_draw_scanline(xmax,oxmax - 1,y,color,opacity,1);
-            else cimg_draw_scanline(oxmax + (oxmax==xmax?0:1),xmax,y,color,opacity,1);
-            if (y==tymax) cimg_draw_scanline(xmin + 1,xmax - 1,y,color,opacity,1);
-          }
-        }
-        oxmin = xmin; oxmax = xmax;
-      }
-      return *this;
-    }
-
-    //! Draw a filled 2d circle.
-    /**
-       \param x0 X-coordinate of the circle center.
-       \param y0 Y-coordinate of the circle center.
-       \param radius  Circle radius.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \note
-       - Circle version of the Bresenham's algorithm is used.
-    **/
-    template<typename tc>
-    CImg<T>& draw_circle(const int x0, const int y0, int radius,
-                         const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_circle(): Specified color is (null).",
-                                    cimg_instance);
-      cimg_init_scanline(color,opacity);
-      if (radius<0 || x0 - radius>=width() || y0 + radius<0 || y0 - radius>=height()) return *this;
-      if (y0>=0 && y0<height()) cimg_draw_scanline(x0 - radius,x0 + radius,y0,color,opacity,1);
-      for (int f = 1 - radius, ddFx = 0, ddFy = -(radius<<1), x = 0, y = radius; x<y; ) {
-        if (f>=0) {
-          const int x1 = x0 - x, x2 = x0 + x, y1 = y0 - y, y2 = y0 + y;
-          if (y1>=0 && y1<height()) cimg_draw_scanline(x1,x2,y1,color,opacity,1);
-          if (y2>=0 && y2<height()) cimg_draw_scanline(x1,x2,y2,color,opacity,1);
-          f+=(ddFy+=2); --y;
-        }
-        const bool no_diag = y!=(x++);
-        ++(f+=(ddFx+=2));
-        const int x1 = x0 - y, x2 = x0 + y, y1 = y0 - x, y2 = y0 + x;
-        if (no_diag) {
-          if (y1>=0 && y1<height()) cimg_draw_scanline(x1,x2,y1,color,opacity,1);
-          if (y2>=0 && y2<height()) cimg_draw_scanline(x1,x2,y2,color,opacity,1);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw an outlined 2d circle.
-    /**
-       \param x0 X-coordinate of the circle center.
-       \param y0 Y-coordinate of the circle center.
-       \param radius Circle radius.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern An integer whose bits describe the outline pattern.
-    **/
-    template<typename tc>
-    CImg<T>& draw_circle(const int x0, const int y0, int radius,
-                         const tc *const color, const float opacity,
-                         const unsigned int pattern) {
-      cimg::unused(pattern);
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_circle(): Specified color is (null).",
-                                    cimg_instance);
-      if (radius<0 || x0 - radius>=width() || y0 + radius<0 || y0 - radius>=height()) return *this;
-      if (!radius) return draw_point(x0,y0,color,opacity);
-      draw_point(x0 - radius,y0,color,opacity).draw_point(x0 + radius,y0,color,opacity).
-        draw_point(x0,y0 - radius,color,opacity).draw_point(x0,y0 + radius,color,opacity);
-      if (radius==1) return *this;
-      for (int f = 1 - radius, ddFx = 0, ddFy = -(radius<<1), x = 0, y = radius; x<y; ) {
-        if (f>=0) { f+=(ddFy+=2); --y; }
-        ++x; ++(f+=(ddFx+=2));
-        if (x!=y + 1) {
-          const int x1 = x0 - y, x2 = x0 + y, y1 = y0 - x, y2 = y0 + x,
-            x3 = x0 - x, x4 = x0 + x, y3 = y0 - y, y4 = y0 + y;
-          draw_point(x1,y1,color,opacity).draw_point(x1,y2,color,opacity).
-            draw_point(x2,y1,color,opacity).draw_point(x2,y2,color,opacity);
-          if (x!=y)
-            draw_point(x3,y3,color,opacity).draw_point(x4,y4,color,opacity).
-              draw_point(x4,y3,color,opacity).draw_point(x3,y4,color,opacity);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw an image.
-    /**
-       \param sprite Sprite image.
-       \param x0 X-coordinate of the sprite position.
-       \param y0 Y-coordinate of the sprite position.
-       \param z0 Z-coordinate of the sprite position.
-       \param c0 C-coordinate of the sprite position.
-       \param opacity Drawing opacity.
-    **/
-    template<typename t>
-    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
-                        const CImg<t>& sprite, const float opacity=1) {
-      if (is_empty() || !sprite) return *this;
-      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,opacity);
-      if (x0==0 && y0==0 && z0==0 && c0==0 && is_sameXYZC(sprite) && opacity>=1 && !is_shared())
-        return assign(sprite,false);
-      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
-      const int
-        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
-        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
-        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
-        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
-      const t
-        *ptrs = sprite._data +
-        (bx?-x0:0) +
-        (by?-y0*(ulongT)sprite.width():0) +
-        (bz?-z0*(ulongT)sprite.width()*sprite.height():0) +
-        (bc?-c0*(ulongT)sprite.width()*sprite.height()*sprite.depth():0);
-      const ulongT
-        offX = (ulongT)_width - lX,
-        soffX = (ulongT)sprite._width - lX,
-        offY = (ulongT)_width*(_height - lY),
-        soffY = (ulongT)sprite._width*(sprite._height - lY),
-        offZ = (ulongT)_width*_height*(_depth - lZ),
-        soffZ = (ulongT)sprite._width*sprite._height*(sprite._depth - lZ);
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      if (lX>0 && lY>0 && lZ>0 && lC>0) {
-        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
-        for (int v = 0; v<lC; ++v) {
-          for (int z = 0; z<lZ; ++z) {
-            for (int y = 0; y<lY; ++y) {
-              if (opacity>=1) for (int x = 0; x<lX; ++x) *(ptrd++) = (T)*(ptrs++);
-              else for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*(*(ptrs++)) + *ptrd*copacity); ++ptrd; }
-              ptrd+=offX; ptrs+=soffX;
-            }
-            ptrd+=offY; ptrs+=soffY;
-          }
-          ptrd+=offZ; ptrs+=soffZ;
-        }
-      }
-      return *this;
-    }
-
-    //! Draw an image \specialization.
-    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
-                        const CImg<T>& sprite, const float opacity=1) {
-      if (is_empty() || !sprite) return *this;
-      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,opacity);
-      if (x0==0 && y0==0 && z0==0 && c0==0 && is_sameXYZC(sprite) && opacity>=1 && !is_shared())
-        return assign(sprite,false);
-      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
-      const int
-        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
-        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
-        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
-        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
-      const T
-        *ptrs = sprite._data +
-        (bx?-x0:0) +
-        (by?-y0*(ulongT)sprite.width():0) +
-        (bz?-z0*(ulongT)sprite.width()*sprite.height():0) +
-        (bc?-c0*(ulongT)sprite.width()*sprite.height()*sprite.depth():0);
-      const ulongT
-        offX = (ulongT)_width - lX,
-        soffX = (ulongT)sprite._width - lX,
-        offY = (ulongT)_width*(_height - lY),
-        soffY = (ulongT)sprite._width*(sprite._height - lY),
-        offZ = (ulongT)_width*_height*(_depth - lZ),
-        soffZ = (ulongT)sprite._width*sprite._height*(sprite._depth - lZ),
-        slX = lX*sizeof(T);
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      if (lX>0 && lY>0 && lZ>0 && lC>0) {
-        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
-        for (int v = 0; v<lC; ++v) {
-          for (int z = 0; z<lZ; ++z) {
-            if (opacity>=1)
-              for (int y = 0; y<lY; ++y) { std::memcpy(ptrd,ptrs,slX); ptrd+=_width; ptrs+=sprite._width; }
-            else for (int y = 0; y<lY; ++y) {
-                for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*(*(ptrs++)) + *ptrd*copacity); ++ptrd; }
-                ptrd+=offX; ptrs+=soffX;
-              }
-            ptrd+=offY; ptrs+=soffY;
-          }
-          ptrd+=offZ; ptrs+=soffZ;
-        }
-      }
-      return *this;
-    }
-
-    //! Draw an image \overloading.
-    template<typename t>
-    CImg<T>& draw_image(const int x0, const int y0, const int z0,
-                        const CImg<t>& sprite, const float opacity=1) {
-      return draw_image(x0,y0,z0,0,sprite,opacity);
-    }
-
-    //! Draw an image \overloading.
-    template<typename t>
-    CImg<T>& draw_image(const int x0, const int y0,
-                        const CImg<t>& sprite, const float opacity=1) {
-      return draw_image(x0,y0,0,sprite,opacity);
-    }
-
-    //! Draw an image \overloading.
-    template<typename t>
-    CImg<T>& draw_image(const int x0,
-                        const CImg<t>& sprite, const float opacity=1) {
-      return draw_image(x0,0,sprite,opacity);
-    }
-
-    //! Draw an image \overloading.
-    template<typename t>
-    CImg<T>& draw_image(const CImg<t>& sprite, const float opacity=1) {
-      return draw_image(0,sprite,opacity);
-    }
-
-    //! Draw a masked image.
-    /**
-       \param sprite Sprite image.
-       \param mask Mask image.
-       \param x0 X-coordinate of the sprite position in the image instance.
-       \param y0 Y-coordinate of the sprite position in the image instance.
-       \param z0 Z-coordinate of the sprite position in the image instance.
-       \param c0 C-coordinate of the sprite position in the image instance.
-       \param mask_max_value Maximum pixel value of the mask image \c mask.
-       \param opacity Drawing opacity.
-       \note
-       - Pixel values of \c mask set the opacity of the corresponding pixels in \c sprite.
-       - Dimensions along x,y and z of \p sprite and \p mask must be the same.
-    **/
-    template<typename ti, typename tm>
-    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
-                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
-                        const float mask_max_value=1) {
-      if (is_empty() || !sprite || !mask) return *this;
-      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,mask,opacity,mask_max_value);
-      if (is_overlapped(mask)) return draw_image(x0,y0,z0,c0,sprite,+mask,opacity,mask_max_value);
-      if (mask._width!=sprite._width || mask._height!=sprite._height || mask._depth!=sprite._depth)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_image(): Sprite (%u,%u,%u,%u,%p) and mask (%u,%u,%u,%u,%p) have "
-                                    "incompatible dimensions.",
-                                    cimg_instance,
-                                    sprite._width,sprite._height,sprite._depth,sprite._spectrum,sprite._data,
-                                    mask._width,mask._height,mask._depth,mask._spectrum,mask._data);
-
-      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
-      const int
-        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
-        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
-        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
-        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
-      const ulongT
-        coff = (bx?-x0:0) +
-        (by?-y0*(ulongT)mask.width():0) +
-        (bz?-z0*(ulongT)mask.width()*mask.height():0) +
-        (bc?-c0*(ulongT)mask.width()*mask.height()*mask.depth():0),
-        ssize = (ulongT)mask.width()*mask.height()*mask.depth()*mask.spectrum();
-      const ti *ptrs = sprite._data + coff;
-      const tm *ptrm = mask._data + coff;
-      const ulongT
-        offX = (ulongT)_width - lX,
-        soffX = (ulongT)sprite._width - lX,
-        offY = (ulongT)_width*(_height - lY),
-        soffY = (ulongT)sprite._width*(sprite._height - lY),
-        offZ = (ulongT)_width*_height*(_depth - lZ),
-        soffZ = (ulongT)sprite._width*sprite._height*(sprite._depth - lZ);
-      if (lX>0 && lY>0 && lZ>0 && lC>0) {
-        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
-        for (int c = 0; c<lC; ++c) {
-          ptrm = mask._data + (ptrm - mask._data)%ssize;
-          for (int z = 0; z<lZ; ++z) {
-            for (int y = 0; y<lY; ++y) {
-              for (int x = 0; x<lX; ++x) {
-                const float mopacity = (float)(*(ptrm++)*opacity),
-                  nopacity = cimg::abs(mopacity), copacity = mask_max_value - std::max(mopacity,0.0f);
-                *ptrd = (T)((nopacity*(*(ptrs++)) + *ptrd*copacity)/mask_max_value);
-                ++ptrd;
-              }
-              ptrd+=offX; ptrs+=soffX; ptrm+=soffX;
-            }
-            ptrd+=offY; ptrs+=soffY; ptrm+=soffY;
-          }
-          ptrd+=offZ; ptrs+=soffZ; ptrm+=soffZ;
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a masked image \overloading.
-    template<typename ti, typename tm>
-    CImg<T>& draw_image(const int x0, const int y0, const int z0,
-                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
-                        const float mask_max_value=1) {
-      return draw_image(x0,y0,z0,0,sprite,mask,opacity,mask_max_value);
-    }
-
-    //! Draw a image \overloading.
-    template<typename ti, typename tm>
-    CImg<T>& draw_image(const int x0, const int y0,
-                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
-                        const float mask_max_value=1) {
-      return draw_image(x0,y0,0,sprite,mask,opacity,mask_max_value);
-    }
-
-    //! Draw a image \overloading.
-    template<typename ti, typename tm>
-    CImg<T>& draw_image(const int x0,
-                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
-                        const float mask_max_value=1) {
-      return draw_image(x0,0,sprite,mask,opacity,mask_max_value);
-    }
-
-    //! Draw an image.
-    template<typename ti, typename tm>
-    CImg<T>& draw_image(const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
-                        const float mask_max_value=1) {
-      return draw_image(0,sprite,mask,opacity,mask_max_value);
-    }
-
-    //! Draw a text string.
-    /**
-       \param x0 X-coordinate of the text in the image instance.
-       \param y0 Y-coordinate of the text in the image instance.
-       \param text Format of the text ('printf'-style format string).
-       \param foreground_color Pointer to \c spectrum() consecutive values, defining the foreground drawing color.
-       \param background_color Pointer to \c spectrum() consecutive values, defining the background drawing color.
-       \param opacity Drawing opacity.
-       \param font Font used for drawing text.
-    **/
-    template<typename tc1, typename tc2, typename t>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const tc1 *const foreground_color, const tc2 *const background_color,
-                       const float opacity, const CImgList<t>& font, ...) {
-      if (!font) return *this;
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      return _draw_text(x0,y0,tmp,foreground_color,background_color,opacity,font,false);
-    }
-
-    //! Draw a text string \overloading.
-    /**
-       \note A transparent background is used for the text.
-    **/
-    template<typename tc, typename t>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const tc *const foreground_color, const int,
-                       const float opacity, const CImgList<t>& font, ...) {
-      if (!font) return *this;
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      return _draw_text(x0,y0,tmp,foreground_color,(tc*)0,opacity,font,false);
-    }
-
-    //! Draw a text string \overloading.
-    /**
-       \note A transparent foreground is used for the text.
-    **/
-    template<typename tc, typename t>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const int, const tc *const background_color,
-                       const float opacity, const CImgList<t>& font, ...) {
-      if (!font) return *this;
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      return _draw_text(x0,y0,tmp,(tc*)0,background_color,opacity,font,false);
-    }
-
-    //! Draw a text string \overloading.
-    /**
-       \param x0 X-coordinate of the text in the image instance.
-       \param y0 Y-coordinate of the text in the image instance.
-       \param text Format of the text ('printf'-style format string).
-       \param foreground_color Array of spectrum() values of type \c T,
-         defining the foreground color (0 means 'transparent').
-       \param background_color Array of spectrum() values of type \c T,
-         defining the background color (0 means 'transparent').
-       \param opacity Drawing opacity.
-       \param font_height Height of the text font (exact match for 13,23,53,103, interpolated otherwise).
-    **/
-    template<typename tc1, typename tc2>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const tc1 *const foreground_color, const tc2 *const background_color,
-                       const float opacity=1, const unsigned int font_height=13, ...) {
-      if (!font_height) return *this;
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font_height);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      const CImgList<ucharT>& font = CImgList<ucharT>::font(font_height,true);
-      _draw_text(x0,y0,tmp,foreground_color,background_color,opacity,font,true);
-      return *this;
-    }
-
-    //! Draw a text string \overloading.
-    template<typename tc>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const tc *const foreground_color, const int background_color=0,
-                       const float opacity=1, const unsigned int font_height=13, ...) {
-      if (!font_height) return *this;
-      cimg::unused(background_color);
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font_height);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      return draw_text(x0,y0,"%s",foreground_color,(const tc*)0,opacity,font_height,tmp._data);
-    }
-
-    //! Draw a text string \overloading.
-    template<typename tc>
-    CImg<T>& draw_text(const int x0, const int y0,
-                       const char *const text,
-                       const int, const tc *const background_color,
-                       const float opacity=1, const unsigned int font_height=13, ...) {
-      if (!font_height) return *this;
-      CImg<charT> tmp(2048);
-      std::va_list ap; va_start(ap,font_height);
-      cimg_vsnprintf(tmp,tmp._width,text,ap); va_end(ap);
-      return draw_text(x0,y0,"%s",(tc*)0,background_color,opacity,font_height,tmp._data);
-    }
-
-    template<typename tc1, typename tc2, typename t>
-    CImg<T>& _draw_text(const int x0, const int y0,
-                        const char *const text,
-                        const tc1 *const foreground_color, const tc2 *const background_color,
-                        const float opacity, const CImgList<t>& font,
-                        const bool is_native_font) {
-      if (!text) return *this;
-      if (!font)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_text(): Empty specified font.",
-                                    cimg_instance);
-
-      const unsigned int text_length = (unsigned int)std::strlen(text);
-      const bool _is_empty = is_empty();
-      if (_is_empty) {
-        // If needed, pre-compute necessary size of the image
-        int x = 0, y = 0, w = 0;
-        unsigned char c = 0;
-        for (unsigned int i = 0; i<text_length; ++i) {
-          c = (unsigned char)text[i];
-          switch (c) {
-          case '\n' : y+=font[0]._height; if (x>w) w = x; x = 0; break;
-          case '\t' : x+=4*font[' ']._width; break;
-          default : if (c<font._width) x+=font[c]._width;
-          }
-        }
-        if (x!=0 || c=='\n') {
-          if (x>w) w=x;
-          y+=font[0]._height;
-        }
-        assign(x0 + w,y0 + y,1,is_native_font?1:font[0]._spectrum,(T)0);
-      }
-
-      int x = x0, y = y0;
-      for (unsigned int i = 0; i<text_length; ++i) {
-        const unsigned char c = (unsigned char)text[i];
-        switch (c) {
-        case '\n' : y+=font[0]._height; x = x0; break;
-        case '\t' : x+=4*font[' ']._width; break;
-        default : if (c<font._width) {
-            CImg<T> letter = font[c];
-            if (letter) {
-              if (is_native_font && _spectrum>letter._spectrum) letter.resize(-100,-100,1,_spectrum,0,2);
-              const unsigned int cmin = std::min(_spectrum,letter._spectrum);
-              if (foreground_color)
-                for (unsigned int c = 0; c<cmin; ++c)
-                  if (foreground_color[c]!=1) letter.get_shared_channel(c)*=foreground_color[c];
-              if (c + 256<font.width()) { // Letter has mask.
-                if (background_color)
-                  for (unsigned int c = 0; c<cmin; ++c)
-                    draw_rectangle(x,y,0,c,x + letter._width - 1,y + letter._height - 1,0,c,
-                                   background_color[c],opacity);
-                draw_image(x,y,letter,font[c + 256],opacity,255.0f);
-              } else draw_image(x,y,letter,opacity); // Letter has no mask.
-              x+=letter._width;
-            }
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a 2d vector field.
-    /**
-       \param flow Image of 2d vectors used as input data.
-       \param color Image of spectrum()-D vectors corresponding to the color of each arrow.
-       \param opacity Drawing opacity.
-       \param sampling Length (in pixels) between each arrow.
-       \param factor Length factor of each arrow (if <0, computed as a percentage of the maximum length).
-       \param is_arrow Tells if arrows must be drawn, instead of oriented segments.
-       \param pattern Used pattern to draw lines.
-       \note Clipping is supported.
-    **/
-    template<typename t1, typename t2>
-    CImg<T>& draw_quiver(const CImg<t1>& flow,
-                         const t2 *const color, const float opacity=1,
-                         const unsigned int sampling=25, const float factor=-20,
-                         const bool is_arrow=true, const unsigned int pattern=~0U) {
-      return draw_quiver(flow,CImg<t2>(color,_spectrum,1,1,1,true),opacity,sampling,factor,is_arrow,pattern);
-    }
-
-    //! Draw a 2d vector field, using a field of colors.
-    /**
-       \param flow Image of 2d vectors used as input data.
-       \param color Image of spectrum()-D vectors corresponding to the color of each arrow.
-       \param opacity Opacity of the drawing.
-       \param sampling Length (in pixels) between each arrow.
-       \param factor Length factor of each arrow (if <0, computed as a percentage of the maximum length).
-       \param is_arrow Tells if arrows must be drawn, instead of oriented segments.
-       \param pattern Used pattern to draw lines.
-       \note Clipping is supported.
-    **/
-    template<typename t1, typename t2>
-    CImg<T>& draw_quiver(const CImg<t1>& flow,
-                         const CImg<t2>& color, const float opacity=1,
-                         const unsigned int sampling=25, const float factor=-20,
-                         const bool is_arrow=true, const unsigned int pattern=~0U) {
-      if (is_empty()) return *this;
-      if (!flow || flow._spectrum!=2)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_quiver(): Invalid dimensions of specified flow (%u,%u,%u,%u,%p).",
-                                    cimg_instance,
-                                    flow._width,flow._height,flow._depth,flow._spectrum,flow._data);
-      if (sampling<=0)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_quiver(): Invalid sampling value %g "
-                                    "(should be >0)",
-                                    cimg_instance,
-                                    sampling);
-      const bool colorfield = (color._width==flow._width && color._height==flow._height &&
-                               color._depth==1 && color._spectrum==_spectrum);
-      if (is_overlapped(flow)) return draw_quiver(+flow,color,opacity,sampling,factor,is_arrow,pattern);
-      float vmax,fact;
-      if (factor<=0) {
-        float m, M = (float)flow.get_norm(2).max_min(m);
-        vmax = (float)std::max(cimg::abs(m),cimg::abs(M));
-        if (!vmax) vmax = 1;
-        fact = -factor;
-      } else { fact = factor; vmax = 1; }
-
-      for (unsigned int y = sampling/2; y<_height; y+=sampling)
-        for (unsigned int x = sampling/2; x<_width; x+=sampling) {
-          const unsigned int X = x*flow._width/_width, Y = y*flow._height/_height;
-          float u = (float)flow(X,Y,0,0)*fact/vmax, v = (float)flow(X,Y,0,1)*fact/vmax;
-          if (is_arrow) {
-            const int xx = (int)(x + u), yy = (int)(y + v);
-            if (colorfield) draw_arrow(x,y,xx,yy,color.get_vector_at(X,Y)._data,opacity,45,sampling/5.0f,pattern);
-            else draw_arrow(x,y,xx,yy,color._data,opacity,45,sampling/5.0f,pattern);
-          } else {
-            if (colorfield)
-              draw_line((int)(x - 0.5*u),(int)(y - 0.5*v),(int)(x + 0.5*u),(int)(y + 0.5*v),
-                        color.get_vector_at(X,Y)._data,opacity,pattern);
-            else draw_line((int)(x - 0.5*u),(int)(y - 0.5*v),(int)(x + 0.5*u),(int)(y + 0.5*v),
-                           color._data,opacity,pattern);
-          }
-        }
-      return *this;
-    }
-
-    //! Draw a labeled horizontal axis.
-    /**
-       \param values_x Values along the horizontal axis.
-       \param y Y-coordinate of the horizontal axis in the image instance.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern Drawing pattern.
-       \param font_height Height of the labels (exact match for 13,23,53,103, interpolated otherwise).
-       \param allow_zero Enable/disable the drawing of label '0' if found.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_axis(const CImg<t>& values_x, const int y,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const unsigned int font_height=13,
-                       const bool allow_zero=true) {
-      if (is_empty()) return *this;
-      const int yt = (y + 3 + font_height)<_height?y + 3:y - 2 - (int)font_height;
-      const int siz = (int)values_x.size() - 1;
-      CImg<charT> txt(32);
-      CImg<T> label;
-      if (siz<=0) { // Degenerated case.
-        draw_line(0,y,_width - 1,y,color,opacity,pattern);
-        if (!siz) {
-          cimg_snprintf(txt,txt._width,"%g",(double)*values_x);
-          label.assign().draw_text(0,0,txt,color,(tc*)0,opacity,font_height);
-          const int
-            _xt = (width() - label.width())/2,
-            xt = _xt<3?3:_xt + label.width()>=width() - 2?width() - 3 - label.width():_xt;
-          draw_point(width()/2,y - 1,color,opacity).draw_point(width()/2,y + 1,color,opacity);
-          if (allow_zero || *txt!='0' || txt[1]!=0)
-            draw_text(xt,yt,txt,color,(tc*)0,opacity,font_height);
-        }
-      } else { // Regular case.
-        if (values_x[0]<values_x[siz]) draw_arrow(0,y,_width - 1,y,color,opacity,30,5,pattern);
-        else draw_arrow(_width - 1,y,0,y,color,opacity,30,5,pattern);
-        cimg_foroff(values_x,x) {
-          cimg_snprintf(txt,txt._width,"%g",(double)values_x(x));
-          label.assign().draw_text(0,0,txt,color,(tc*)0,opacity,font_height);
-          const int
-            xi = (int)(x*(_width - 1)/siz),
-            _xt = xi - label.width()/2,
-            xt = _xt<3?3:_xt + label.width()>=width() - 2?width() - 3 - label.width():_xt;
-          draw_point(xi,y - 1,color,opacity).draw_point(xi,y + 1,color,opacity);
-          if (allow_zero || *txt!='0' || txt[1]!=0)
-            draw_text(xt,yt,txt,color,(tc*)0,opacity,font_height);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a labeled vertical axis.
-    /**
-       \param x X-coordinate of the vertical axis in the image instance.
-       \param values_y Values along the Y-axis.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern Drawing pattern.
-       \param font_height Height of the labels (exact match for 13,23,53,103, interpolated otherwise).
-       \param allow_zero Enable/disable the drawing of label '0' if found.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_axis(const int x, const CImg<t>& values_y,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern=~0U, const unsigned int font_height=13,
-                       const bool allow_zero=true) {
-      if (is_empty()) return *this;
-      int siz = (int)values_y.size() - 1;
-      CImg<charT> txt(32);
-      CImg<T> label;
-      if (siz<=0) { // Degenerated case.
-        draw_line(x,0,x,_height - 1,color,opacity,pattern);
-        if (!siz) {
-          cimg_snprintf(txt,txt._width,"%g",(double)*values_y);
-          label.assign().draw_text(0,0,txt,color,(tc*)0,opacity,font_height);
-          const int
-            _yt = (height() - label.height())/2,
-            yt = _yt<0?0:_yt + label.height()>=height()?height() - 1-label.height():_yt,
-            _xt = x - 2 - label.width(),
-            xt = _xt>=0?_xt:x + 3;
-          draw_point(x - 1,height()/2,color,opacity).draw_point(x + 1,height()/2,color,opacity);
-          if (allow_zero || *txt!='0' || txt[1]!=0)
-            draw_text(xt,yt,txt,color,(tc*)0,opacity,font_height);
-        }
-      } else { // Regular case.
-        if (values_y[0]<values_y[siz]) draw_arrow(x,0,x,_height - 1,color,opacity,30,5,pattern);
-        else draw_arrow(x,_height - 1,x,0,color,opacity,30,5,pattern);
-        cimg_foroff(values_y,y) {
-          cimg_snprintf(txt,txt._width,"%g",(double)values_y(y));
-          label.assign().draw_text(0,0,txt,color,(tc*)0,opacity,font_height);
-          const int
-            yi = (int)(y*(_height - 1)/siz),
-            _yt = yi - label.height()/2,
-            yt = _yt<0?0:_yt + label.height()>=height()?height() - 1-label.height():_yt,
-            _xt = x - 2 - label.width(),
-            xt = _xt>=0?_xt:x + 3;
-          draw_point(x - 1,yi,color,opacity).draw_point(x + 1,yi,color,opacity);
-          if (allow_zero || *txt!='0' || txt[1]!=0)
-            draw_text(xt,yt,txt,color,(tc*)0,opacity,font_height);
-        }
-      }
-      return *this;
-    }
-
-    //! Draw labeled horizontal and vertical axes.
-    /**
-       \param values_x Values along the X-axis.
-       \param values_y Values along the Y-axis.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern_x Drawing pattern for the X-axis.
-       \param pattern_y Drawing pattern for the Y-axis.
-       \param font_height Height of the labels (exact match for 13,23,53,103, interpolated otherwise).
-       \param allow_zero Enable/disable the drawing of label '0' if found.
-    **/
-    template<typename tx, typename ty, typename tc>
-    CImg<T>& draw_axes(const CImg<tx>& values_x, const CImg<ty>& values_y,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern_x=~0U, const unsigned int pattern_y=~0U,
-                       const unsigned int font_height=13, const bool allow_zero=true) {
-      if (is_empty()) return *this;
-      const CImg<tx> nvalues_x(values_x._data,values_x.size(),1,1,1,true);
-      const int sizx = (int)values_x.size() - 1, wm1 = width() - 1;
-      if (sizx>=0) {
-        float ox = (float)*nvalues_x;
-        for (unsigned int x = sizx?1U:0U; x<_width; ++x) {
-          const float nx = (float)nvalues_x._linear_atX((float)x*sizx/wm1);
-          if (nx*ox<=0) { draw_axis(nx==0?x:x - 1,values_y,color,opacity,pattern_y,font_height,allow_zero); break; }
-          ox = nx;
-        }
-      }
-      const CImg<ty> nvalues_y(values_y._data,values_y.size(),1,1,1,true);
-      const int sizy = (int)values_y.size() - 1, hm1 = height() - 1;
-      if (sizy>0) {
-        float oy = (float)nvalues_y[0];
-        for (unsigned int y = sizy?1U:0U; y<_height; ++y) {
-          const float ny = (float)nvalues_y._linear_atX((float)y*sizy/hm1);
-          if (ny*oy<=0) { draw_axis(values_x,ny==0?y:y - 1,color,opacity,pattern_x,font_height,allow_zero); break; }
-          oy = ny;
-        }
-      }
-      return *this;
-    }
-
-    //! Draw labeled horizontal and vertical axes \overloading.
-    template<typename tc>
-    CImg<T>& draw_axes(const float x0, const float x1, const float y0, const float y1,
-                       const tc *const color, const float opacity=1,
-                       const int subdivisionx=-60, const int subdivisiony=-60,
-                       const float precisionx=0, const float precisiony=0,
-                       const unsigned int pattern_x=~0U, const unsigned int pattern_y=~0U,
-                       const unsigned int font_height=13) {
-      if (is_empty()) return *this;
-      const bool allow_zero = (x0*x1>0) || (y0*y1>0);
-      const float
-        dx = cimg::abs(x1-x0), dy = cimg::abs(y1-y0),
-        px = dx<=0?1:precisionx==0?(float)std::pow(10.0,(int)std::log10(dx) - 2.0):precisionx,
-        py = dy<=0?1:precisiony==0?(float)std::pow(10.0,(int)std::log10(dy) - 2.0):precisiony;
-      if (x0!=x1 && y0!=y1)
-        draw_axes(CImg<floatT>::sequence(subdivisionx>0?subdivisionx:1-width()/subdivisionx,x0,x1).round(px),
-                  CImg<floatT>::sequence(subdivisiony>0?subdivisiony:1-height()/subdivisiony,y0,y1).round(py),
-                  color,opacity,pattern_x,pattern_y,font_height,allow_zero);
-      else if (x0==x1 && y0!=y1)
-        draw_axis((int)x0,CImg<floatT>::sequence(subdivisiony>0?subdivisiony:1-height()/subdivisiony,y0,y1).round(py),
-                  color,opacity,pattern_y,font_height);
-      else if (x0!=x1 && y0==y1)
-        draw_axis(CImg<floatT>::sequence(subdivisionx>0?subdivisionx:1-width()/subdivisionx,x0,x1).round(px),(int)y0,
-                  color,opacity,pattern_x,font_height);
-      return *this;
-    }
-
-    //! Draw 2d grid.
-    /**
-       \param values_x X-coordinates of the vertical lines.
-       \param values_y Y-coordinates of the horizontal lines.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-       \param pattern_x Drawing pattern for vertical lines.
-       \param pattern_y Drawing pattern for horizontal lines.
-    **/
-    template<typename tx, typename ty, typename tc>
-    CImg<T>& draw_grid(const CImg<tx>& values_x, const CImg<ty>& values_y,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern_x=~0U, const unsigned int pattern_y=~0U) {
-      if (is_empty()) return *this;
-      if (values_x) cimg_foroff(values_x,x) {
-          const int xi = (int)values_x[x];
-          if (xi>=0 && xi<width()) draw_line(xi,0,xi,_height - 1,color,opacity,pattern_x);
-        }
-      if (values_y) cimg_foroff(values_y,y) {
-          const int yi = (int)values_y[y];
-          if (yi>=0 && yi<height()) draw_line(0,yi,_width - 1,yi,color,opacity,pattern_y);
-        }
-      return *this;
-    }
-
-    //! Draw 2d grid \simplification.
-    template<typename tc>
-    CImg<T>& draw_grid(const float delta_x,  const float delta_y,
-                       const float offsetx, const float offsety,
-                       const bool invertx, const bool inverty,
-                       const tc *const color, const float opacity=1,
-                       const unsigned int pattern_x=~0U, const unsigned int pattern_y=~0U) {
-      if (is_empty()) return *this;
-      CImg<uintT> seqx, seqy;
-      if (delta_x!=0) {
-        const float dx = delta_x>0?delta_x:_width*-delta_x/100;
-        const unsigned int nx = (unsigned int)(_width/dx);
-        seqx = CImg<uintT>::sequence(1 + nx,0,(unsigned int)(dx*nx));
-        if (offsetx) cimg_foroff(seqx,x) seqx(x) = (unsigned int)cimg::mod(seqx(x) + offsetx,(float)_width);
-        if (invertx) cimg_foroff(seqx,x) seqx(x) = _width - 1 - seqx(x);
-      }
-      if (delta_y!=0) {
-        const float dy = delta_y>0?delta_y:_height*-delta_y/100;
-        const unsigned int ny = (unsigned int)(_height/dy);
-        seqy = CImg<uintT>::sequence(1 + ny,0,(unsigned int)(dy*ny));
-        if (offsety) cimg_foroff(seqy,y) seqy(y) = (unsigned int)cimg::mod(seqy(y) + offsety,(float)_height);
-        if (inverty) cimg_foroff(seqy,y) seqy(y) = _height - 1 - seqy(y);
-     }
-      return draw_grid(seqx,seqy,color,opacity,pattern_x,pattern_y);
-    }
-
-    //! Draw 1d graph.
-    /**
-       \param data Image containing the graph values I = f(x).
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-
-       \param plot_type Define the type of the plot:
-                      - 0 = No plot.
-                      - 1 = Plot using segments.
-                      - 2 = Plot using cubic splines.
-                      - 3 = Plot with bars.
-       \param vertex_type Define the type of points:
-                      - 0 = No points.
-                      - 1 = Point.
-                      - 2 = Straight cross.
-                      - 3 = Diagonal cross.
-                      - 4 = Filled circle.
-                      - 5 = Outlined circle.
-                      - 6 = Square.
-                      - 7 = Diamond.
-       \param ymin Lower bound of the y-range.
-       \param ymax Upper bound of the y-range.
-       \param pattern Drawing pattern.
-       \note
-         - if \c ymin==ymax==0, the y-range is computed automatically from the input samples.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_graph(const CImg<t>& data,
-                        const tc *const color, const float opacity=1,
-                        const unsigned int plot_type=1, const int vertex_type=1,
-                        const double ymin=0, const double ymax=0, const unsigned int pattern=~0U) {
-      if (is_empty() || _height<=1) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_graph(): Specified color is (null).",
-                                    cimg_instance);
-
-      // Create shaded colors for displaying bar plots.
-      CImg<tc> color1, color2;
-      if (plot_type==3) {
-        color1.assign(_spectrum); color2.assign(_spectrum);
-        cimg_forC(*this,c) {
-          color1[c] = (tc)std::min((float)cimg::type<tc>::max(),(float)color[c]*1.2f);
-          color2[c] = (tc)(color[c]*0.4f);
-        }
-      }
-
-      // Compute min/max and normalization factors.
-      const ulongT
-        siz = data.size(),
-        _siz1 = siz - (plot_type!=3),
-        siz1 = _siz1?_siz1:1;
-      const unsigned int
-        _width1 = _width - (plot_type!=3),
-        width1 = _width1?_width1:1;
-      double m = ymin, M = ymax;
-      if (ymin==ymax) m = (double)data.max_min(M);
-      if (m==M) { --m; ++M; }
-      const float ca = (float)(M-m)/(_height - 1);
-      bool init_hatch = true;
-
-      // Draw graph edges
-      switch (plot_type%4) {
-      case 1 : { // Segments
-        int oX = 0, oY = (int)((data[0] - m)/ca);
-        if (siz==1) {
-          const int Y = (int)((*data - m)/ca);
-          draw_line(0,Y,width() - 1,Y,color,opacity,pattern);
-        } else {
-          const float fx = (float)_width/siz1;
-          for (ulongT off = 1; off<siz; ++off) {
-            const int
-              X = (int)(off*fx) - 1,
-              Y = (int)((data[off]-m)/ca);
-            draw_line(oX,oY,X,Y,color,opacity,pattern,init_hatch);
-            oX = X; oY = Y;
-            init_hatch = false;
-          }
-        }
-      } break;
-      case 2 : { // Spline
-        const CImg<t> ndata(data._data,siz,1,1,1,true);
-        int oY = (int)((data[0] - m)/ca);
-        cimg_forX(*this,x) {
-          const int Y = (int)((ndata._cubic_atX((float)x*siz1/width1)-m)/ca);
-          if (x>0) draw_line(x,oY,x + 1,Y,color,opacity,pattern,init_hatch);
-          init_hatch = false;
-          oY = Y;
-        }
-      } break;
-      case 3 : { // Bars
-        const int Y0 = (int)(-m/ca);
-        const float fx = (float)_width/siz1;
-        int oX = 0;
-        cimg_foroff(data,off) {
-          const int
-            X = (int)((off + 1)*fx) - 1,
-            Y = (int)((data[off] - m)/ca);
-          draw_rectangle(oX,Y0,X,Y,color,opacity).
-            draw_line(oX,Y,oX,Y0,color2.data(),opacity).
-            draw_line(oX,Y0,X,Y0,Y<=Y0?color2.data():color1.data(),opacity).
-            draw_line(X,Y,X,Y0,color1.data(),opacity).
-            draw_line(oX,Y,X,Y,Y<=Y0?color1.data():color2.data(),opacity);
-          oX = X + 1;
-        }
-      } break;
-      default : break; // No edges
-      }
-
-      // Draw graph points
-      const unsigned int wb2 = plot_type==3?_width1/(2*siz):0;
-      const float fx = (float)_width1/siz1;
-      switch (vertex_type%8) {
-      case 1 : { // Point
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_point(X,Y,color,opacity);
-        }
-      } break;
-      case 2 : { // Straight Cross
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_line(X - 3,Y,X + 3,Y,color,opacity).draw_line(X,Y - 3,X,Y + 3,color,opacity);
-        }
-      } break;
-      case 3 : { // Diagonal Cross
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_line(X - 3,Y - 3,X + 3,Y + 3,color,opacity).draw_line(X - 3,Y + 3,X + 3,Y - 3,color,opacity);
-        }
-      } break;
-      case 4 : { // Filled Circle
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_circle(X,Y,3,color,opacity);
-        }
-      } break;
-      case 5 : { // Outlined circle
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_circle(X,Y,3,color,opacity,0U);
-        }
-      } break;
-      case 6 : { // Square
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_rectangle(X - 3,Y - 3,X + 3,Y + 3,color,opacity,~0U);
-        }
-      } break;
-      case 7 : { // Diamond
-        cimg_foroff(data,off) {
-          const int
-            X = (int)(off*fx + wb2),
-            Y = (int)((data[off]-m)/ca);
-          draw_line(X,Y - 4,X + 4,Y,color,opacity).
-            draw_line(X + 4,Y,X,Y + 4,color,opacity).
-            draw_line(X,Y + 4,X - 4,Y,color,opacity).
-            draw_line(X - 4,Y,X,Y - 4,color,opacity);
-        }
-      } break;
-      default : break; // No points
-      }
-      return *this;
-    }
-
-    bool _draw_fill(const int x, const int y, const int z,
-                    const CImg<T>& ref, const float tolerance2) const {
-      const T *ptr1 = data(x,y,z), *ptr2 = ref._data;
-      const unsigned long off = _width*_height*_depth;
-      float diff = 0;
-      cimg_forC(*this,c) { diff += cimg::sqr(*ptr1 - *(ptr2++)); ptr1+=off; }
-      return diff<=tolerance2;
-    }
-
-    //! Draw filled 3d region with the flood fill algorithm.
-    /**
-       \param x0 X-coordinate of the starting point of the region to fill.
-       \param y0 Y-coordinate of the starting point of the region to fill.
-       \param z0 Z-coordinate of the starting point of the region to fill.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param[out] region Image that will contain the mask of the filled region mask, as an output.
-       \param tolerance Tolerance concerning neighborhood values.
-       \param opacity Opacity of the drawing.
-       \param is_high_connexity Tells if 8-connexity must be used.
-       \return \c region is initialized with the binary mask of the filled region.
-    **/
-    template<typename tc, typename t>
-    CImg<T>& draw_fill(const int x0, const int y0, const int z0,
-                        const tc *const color, const float opacity,
-                        CImg<t> &region,
-                        const float tolerance = 0,
-                        const bool is_high_connectivity = false) {
-#define _draw_fill_push(x,y,z) if (N>=stack._width) stack.resize(2*N + 1,1,1,3,0); \
-                               stack[N] = x; stack(N,1) = y; stack(N++,2) = z
-#define _draw_fill_pop(x,y,z) x = stack[--N]; y = stack(N,1); z = stack(N,2)
-#define _draw_fill_is_inside(x,y,z) !_region(x,y,z) && _draw_fill(x,y,z,ref,tolerance2)
-
-      if (!containsXYZC(x0,y0,z0,0)) return *this;
-      const float nopacity = cimg::abs((float)opacity), copacity = 1 - std::max((float)opacity,0.0f);
-      const float tolerance2 = cimg::sqr(tolerance);
-      const CImg<T> ref = get_vector_at(x0,y0,z0);
-      CImg<uintT> stack(256,1,1,3);
-      CImg<ucharT> _region(_width,_height,_depth,1,0);
-      unsigned int N = 0;
-      int x, y, z;
-
-      _draw_fill_push(x0,y0,z0);
-      while (N>0) {
-        _draw_fill_pop(x,y,z);
-        if (!_region(x,y,z)) {
-          const int yp = y - 1, yn = y + 1, zp = z - 1, zn = z + 1;
-          int xl = x, xr = x;
-
-          // Using these booleans reduces the number of pushes drastically.
-          bool is_yp = false, is_yn = false, is_zp = false, is_zn = false;
-          for (int step = -1; step<2; step+=2) {
-            while (x>=0 && x<width() && _draw_fill_is_inside(x,y,z)) {
-              if (yp>=0 && _draw_fill_is_inside(x,yp,z)) {
-                if (!is_yp) { _draw_fill_push(x,yp,z); is_yp = true; }
-              } else is_yp = false;
-              if (yn<height() && _draw_fill_is_inside(x,yn,z)) {
-                if (!is_yn) { _draw_fill_push(x,yn,z); is_yn = true; }
-              } else is_yn = false;
-              if (depth()>1) {
-                if (zp>=0 && _draw_fill_is_inside(x,y,zp)) {
-                  if (!is_zp) { _draw_fill_push(x,y,zp); is_zp = true; }
-                } else is_zp = false;
-                if (zn<depth() && _draw_fill_is_inside(x,y,zn)) {
-                  if (!is_zn) { _draw_fill_push(x,y,zn); is_zn = true; }
-                } else is_zn = false;
-              }
-              if (is_high_connectivity) {
-                const int xp = x - 1, xn = x + 1;
-                if (yp>=0 && !is_yp) {
-                  if (xp>=0 && _draw_fill_is_inside(xp,yp,z)) {
-                    _draw_fill_push(xp,yp,z); if (step<0) is_yp = true;
-                  }
-                  if (xn<width() && _draw_fill_is_inside(xn,yp,z)) {
-                    _draw_fill_push(xn,yp,z); if (step>0) is_yp = true;
-                  }
-                }
-                if (yn<height() && !is_yn) {
-                  if (xp>=0 && _draw_fill_is_inside(xp,yn,z)) {
-                    _draw_fill_push(xp,yn,z); if (step<0) is_yn = true;
-                  }
-                  if (xn<width() && _draw_fill_is_inside(xn,yn,z)) {
-                    _draw_fill_push(xn,yn,z); if (step>0) is_yn = true;
-                  }
-                }
-                if (depth()>1) {
-                  if (zp>=0 && !is_zp) {
-                    if (xp>=0 && _draw_fill_is_inside(xp,y,zp)) {
-                      _draw_fill_push(xp,y,zp); if (step<0) is_zp = true;
-                    }
-                    if (xn<width() && _draw_fill_is_inside(xn,y,zp)) {
-                      _draw_fill_push(xn,y,zp); if (step>0) is_zp = true;
-                    }
-
-                    if (yp>=0 && !is_yp) {
-                      if (_draw_fill_is_inside(x,yp,zp)) { _draw_fill_push(x,yp,zp); }
-                      if (xp>=0 && _draw_fill_is_inside(xp,yp,zp)) { _draw_fill_push(xp,yp,zp); }
-                      if (xn<width() && _draw_fill_is_inside(xn,yp,zp)) { _draw_fill_push(xn,yp,zp); }
-                    }
-                    if (yn<height() && !is_yn) {
-                      if (_draw_fill_is_inside(x,yn,zp)) { _draw_fill_push(x,yn,zp); }
-                      if (xp>=0 && _draw_fill_is_inside(xp,yn,zp)) { _draw_fill_push(xp,yn,zp); }
-                      if (xn<width() && _draw_fill_is_inside(xn,yn,zp)) { _draw_fill_push(xn,yn,zp); }
-                    }
-                  }
-
-                  if (zn<depth() && !is_zn) {
-                    if (xp>=0 && _draw_fill_is_inside(xp,y,zn)) {
-                      _draw_fill_push(xp,y,zn); if (step<0) is_zn = true;
-                    }
-                    if (xn<width() && _draw_fill_is_inside(xn,y,zn)) {
-                      _draw_fill_push(xn,y,zn); if (step>0) is_zn = true;
-                    }
-
-                    if (yp>=0 && !is_yp) {
-                      if (_draw_fill_is_inside(x,yp,zn)) { _draw_fill_push(x,yp,zn); }
-                      if (xp>=0 && _draw_fill_is_inside(xp,yp,zn)) { _draw_fill_push(xp,yp,zn); }
-                      if (xn<width() && _draw_fill_is_inside(xn,yp,zn)) { _draw_fill_push(xn,yp,zn); }
-                    }
-                    if (yn<height() && !is_yn) {
-                      if (_draw_fill_is_inside(x,yn,zn)) { _draw_fill_push(x,yn,zn); }
-                      if (xp>=0 && _draw_fill_is_inside(xp,yn,zn)) { _draw_fill_push(xp,yn,zn); }
-                      if (xn<width() && _draw_fill_is_inside(xn,yn,zn)) { _draw_fill_push(xn,yn,zn); }
-                    }
-                  }
-                }
-              }
-              x+=step;
-            }
-            if (step<0) { xl = ++x; x = xr + 1; is_yp = is_yn = is_zp = is_zn = false; }
-            else xr = --x;
-          }
-          std::memset(_region.data(xl,y,z),1,xr - xl + 1);
-          if (opacity==1) {
-            if (sizeof(T)==1) {
-              const int dx = xr - xl + 1;
-              cimg_forC(*this,c) std::memset(data(xl,y,z,c),(int)color[c],dx);
-            } else cimg_forC(*this,c) {
-                const T val = (T)color[c];
-                T *ptri = data(xl,y,z,c); for (int k = xl; k<=xr; ++k) *(ptri++) = val;
-              }
-          } else cimg_forC(*this,c) {
-              const T val = (T)(color[c]*nopacity);
-              T *ptri = data(xl,y,z,c); for (int k = xl; k<=xr; ++k) { *ptri = (T)(val + *ptri*copacity); ++ptri; }
-            }
-        }
-      }
-      _region.move_to(region);
-      return *this;
-    }
-
-    //! Draw filled 3d region with the flood fill algorithm \simplification.
-    template<typename tc>
-    CImg<T>& draw_fill(const int x0, const int y0, const int z0,
-                       const tc *const color, const float opacity=1,
-                       const float tolerance=0, const bool is_high_connexity=false) {
-      CImg<ucharT> tmp;
-      return draw_fill(x0,y0,z0,color,opacity,tmp,tolerance,is_high_connexity);
-    }
-
-    //! Draw filled 2d region with the flood fill algorithm \simplification.
-    template<typename tc>
-    CImg<T>& draw_fill(const int x0, const int y0,
-                       const tc *const color, const float opacity=1,
-                       const float tolerance=0, const bool is_high_connexity=false) {
-      CImg<ucharT> tmp;
-      return draw_fill(x0,y0,0,color,opacity,tmp,tolerance,is_high_connexity);
-    }
-
-    //! Draw a random plasma texture.
-    /**
-       \param alpha Alpha-parameter.
-       \param beta Beta-parameter.
-       \param scale Scale-parameter.
-       \note Use the mid-point algorithm to render.
-    **/
-    CImg<T>& draw_plasma(const float alpha=1, const float beta=0, const unsigned int scale=8) {
-      if (is_empty()) return *this;
-      const int w = width(), h = height();
-      const Tfloat m = (Tfloat)cimg::type<T>::min(), M = (Tfloat)cimg::type<T>::max();
-      cimg_forZC(*this,z,c) {
-        CImg<T> ref = get_shared_slice(z,c);
-        for (int delta = 1<<std::min(scale,31U); delta>1; delta>>=1) {
-          const int delta2 = delta>>1;
-          const float r = alpha*delta + beta;
-
-          // Square step.
-          for (int y0 = 0; y0<h; y0+=delta)
-            for (int x0 = 0; x0<w; x0+=delta) {
-              const int x1 = (x0 + delta)%w, y1 = (y0 + delta)%h, xc = (x0 + delta2)%w, yc = (y0 + delta2)%h;
-              const Tfloat val = (Tfloat)(0.25f*(ref(x0,y0) + ref(x0,y1) + ref(x0,y1) + ref(x1,y1)) +
-                                          r*cimg::rand(-1,1));
-              ref(xc,yc) = (T)(val<m?m:val>M?M:val);
-            }
-
-          // Diamond steps.
-          for (int y = -delta2; y<h; y+=delta)
-            for (int x0=0; x0<w; x0+=delta) {
-              const int y0 = cimg::mod(y,h), x1 = (x0 + delta)%w, y1 = (y + delta)%h,
-                xc = (x0 + delta2)%w, yc = (y + delta2)%h;
-              const Tfloat val = (Tfloat)(0.25f*(ref(xc,y0) + ref(x0,yc) + ref(xc,y1) + ref(x1,yc)) +
-                                          r*cimg::rand(-1,1));
-              ref(xc,yc) = (T)(val<m?m:val>M?M:val);
-            }
-          for (int y0 = 0; y0<h; y0+=delta)
-            for (int x = -delta2; x<w; x+=delta) {
-              const int x0 = cimg::mod(x,w), x1 = (x + delta)%w, y1 = (y0 + delta)%h,
-                xc = (x + delta2)%w, yc = (y0 + delta2)%h;
-              const Tfloat val = (Tfloat)(0.25f*(ref(xc,y0) + ref(x0,yc) + ref(xc,y1) + ref(x1,yc)) +
-                                          r*cimg::rand(-1,1));
-              ref(xc,yc) = (T)(val<m?m:val>M?M:val);
-            }
-          for (int y = -delta2; y<h; y+=delta)
-            for (int x = -delta2; x<w; x+=delta) {
-              const int x0 = cimg::mod(x,w), y0 = cimg::mod(y,h), x1 = (x + delta)%w, y1 = (y + delta)%h,
-                xc = (x + delta2)%w, yc = (y + delta2)%h;
-              const Tfloat val = (Tfloat)(0.25f*(ref(xc,y0) + ref(x0,yc) + ref(xc,y1) + ref(x1,yc)) +
-                                          r*cimg::rand(-1,1));
-                ref(xc,yc) = (T)(val<m?m:val>M?M:val);
-            }
-        }
-      }
-      return *this;
-    }
-
-    //! Draw a quadratic Mandelbrot or Julia 2d fractal.
-    /**
-       \param x0 X-coordinate of the upper-left pixel.
-       \param y0 Y-coordinate of the upper-left pixel.
-       \param x1 X-coordinate of the lower-right pixel.
-       \param y1 Y-coordinate of the lower-right pixel.
-       \param colormap Colormap.
-       \param opacity Drawing opacity.
-       \param z0r Real part of the upper-left fractal vertex.
-       \param z0i Imaginary part of the upper-left fractal vertex.
-       \param z1r Real part of the lower-right fractal vertex.
-       \param z1i Imaginary part of the lower-right fractal vertex.
-       \param iteration_max Maximum number of iterations for each estimated point.
-       \param is_normalized_iteration Tells if iterations are normalized.
-       \param is_julia_set Tells if the Mandelbrot or Julia set is rendered.
-       \param param_r Real part of the Julia set parameter.
-       \param param_i Imaginary part of the Julia set parameter.
-       \note Fractal rendering is done by the Escape Time Algorithm.
-    **/
-    template<typename tc>
-    CImg<T>& draw_mandelbrot(const int x0, const int y0, const int x1, const int y1,
-                             const CImg<tc>& colormap, const float opacity=1,
-                             const double z0r=-2, const double z0i=-2, const double z1r=2, const double z1i=2,
-                             const unsigned int iteration_max=255,
-                             const bool is_normalized_iteration=false,
-                             const bool is_julia_set=false,
-                             const double param_r=0, const double param_i=0) {
-      if (is_empty()) return *this;
-      CImg<tc> palette;
-      if (colormap) palette.assign(colormap._data,colormap.size()/colormap._spectrum,1,1,colormap._spectrum,true);
-      if (palette && palette._spectrum!=_spectrum)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_mandelbrot(): Instance and specified colormap (%u,%u,%u,%u,%p) have "
-                                    "incompatible dimensions.",
-                                    cimg_instance,
-                                    colormap._width,colormap._height,colormap._depth,colormap._spectrum,colormap._data);
-
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f), ln2 = (float)std::log(2.0);
-      const int
-        _x0 = cimg::cut(x0,0,width() - 1),
-        _y0 = cimg::cut(y0,0,height() - 1),
-        _x1 = cimg::cut(x1,0,width() - 1),
-        _y1 = cimg::cut(y1,0,height() - 1);
-
-      cimg_pragma_openmp(parallel for collapse(2) cimg_openmp_if((1 + _x1 - _x0)*(1 + _y1 - _y0)>=2048))
-      for (int q = _y0; q<=_y1; ++q)
-        for (int p = _x0; p<=_x1; ++p) {
-          unsigned int iteration = 0;
-          const double x = z0r + p*(z1r-z0r)/_width, y = z0i + q*(z1i-z0i)/_height;
-          double zr, zi, cr, ci;
-          if (is_julia_set) { zr = x; zi = y; cr = param_r; ci = param_i; }
-          else { zr = param_r; zi = param_i; cr = x; ci = y; }
-          for (iteration=1; zr*zr + zi*zi<=4 && iteration<=iteration_max; ++iteration) {
-            const double temp = zr*zr - zi*zi + cr;
-            zi = 2*zr*zi + ci;
-            zr = temp;
-          }
-          if (iteration>iteration_max) {
-            if (palette) {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette(0,c);
-              else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(palette(0,c)*nopacity + (*this)(p,q,0,c)*copacity);
-            } else {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)0;
-              else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)((*this)(p,q,0,c)*copacity);
-            }
-          } else if (is_normalized_iteration) {
-            const float
-              normz = (float)cimg::abs(zr*zr + zi*zi),
-              niteration = (float)(iteration + 1 - std::log(std::log(normz))/ln2);
-            if (palette) {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette._linear_atX(niteration,c);
-              else cimg_forC(*this,c)
-                     (*this)(p,q,0,c) = (T)(palette._linear_atX(niteration,c)*nopacity + (*this)(p,q,0,c)*copacity);
-            } else {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)niteration;
-              else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(niteration*nopacity + (*this)(p,q,0,c)*copacity);
-            }
-          } else {
-            if (palette) {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette._atX(iteration,c);
-              else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(palette(iteration,c)*nopacity + (*this)(p,q,0,c)*copacity);
-            } else {
-              if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)iteration;
-              else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(iteration*nopacity + (*this)(p,q,0,c)*copacity);
-            }
-          }
-        }
-      return *this;
-    }
-
-    //! Draw a quadratic Mandelbrot or Julia 2d fractal \overloading.
-    template<typename tc>
-    CImg<T>& draw_mandelbrot(const CImg<tc>& colormap, const float opacity=1,
-                             const double z0r=-2, const double z0i=-2, const double z1r=2, const double z1i=2,
-                             const unsigned int iteration_max=255,
-                             const bool is_normalized_iteration=false,
-                             const bool is_julia_set=false,
-                             const double param_r=0, const double param_i=0) {
-      return draw_mandelbrot(0,0,_width - 1,_height - 1,colormap,opacity,
-                             z0r,z0i,z1r,z1i,iteration_max,is_normalized_iteration,is_julia_set,param_r,param_i);
-    }
-
-    //! Draw a 1d gaussian function.
-    /**
-       \param xc X-coordinate of the gaussian center.
-       \param sigma Standard variation of the gaussian distribution.
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename tc>
-    CImg<T>& draw_gaussian(const float xc, const float sigma,
-                           const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_gaussian(): Specified color is (null).",
-                                    cimg_instance);
-      const float sigma2 = 2*sigma*sigma, nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      const tc *col = color;
-      cimg_forX(*this,x) {
-        const float dx = (x - xc), val = (float)std::exp(-dx*dx/sigma2);
-        T *ptrd = data(x,0,0,0);
-        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
-        else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
-        col-=_spectrum;
-      }
-      return *this;
-    }
-
-    //! Draw a 2d gaussian function.
-    /**
-       \param xc X-coordinate of the gaussian center.
-       \param yc Y-coordinate of the gaussian center.
-       \param tensor Covariance matrix (must be 2x2).
-       \param color Pointer to \c spectrum() consecutive values, defining the drawing color.
-       \param opacity Drawing opacity.
-    **/
-    template<typename t, typename tc>
-    CImg<T>& draw_gaussian(const float xc, const float yc, const CImg<t>& tensor,
-                           const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      if (tensor._width!=2 || tensor._height!=2 || tensor._depth!=1 || tensor._spectrum!=1)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_gaussian(): Specified tensor (%u,%u,%u,%u,%p) is not a 2x2 matrix.",
-                                    cimg_instance,
-                                    tensor._width,tensor._height,tensor._depth,tensor._spectrum,tensor._data);
-      if (!color)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_gaussian(): Specified color is (null).",
-                                    cimg_instance);
-      typedef typename CImg<t>::Tfloat tfloat;
-      const CImg<tfloat> invT = tensor.get_invert(), invT2 = (invT*invT)/(-2.0);
-      const tfloat a = invT2(0,0), b = 2*invT2(1,0), c = invT2(1,1);
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      const tc *col = color;
-      float dy = -yc;
-      cimg_forY(*this,y) {
-        float dx = -xc;
-        cimg_forX(*this,x) {
-          const float val = (float)std::exp(a*dx*dx + b*dx*dy + c*dy*dy);
-          T *ptrd = data(x,y,0,0);
-          if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
-          else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
-          col-=_spectrum;
-          ++dx;
-        }
-        ++dy;
-      }
-      return *this;
-    }
-
-    //! Draw a 2d gaussian function \overloading.
-    template<typename tc>
-    CImg<T>& draw_gaussian(const int xc, const int yc, const float r1, const float r2, const float ru, const float rv,
-                           const tc *const color, const float opacity=1) {
-      const double
-        a = r1*ru*ru + r2*rv*rv,
-        b = (r1-r2)*ru*rv,
-        c = r1*rv*rv + r2*ru*ru;
-      const CImg<Tfloat> tensor(2,2,1,1, a,b,b,c);
-      return draw_gaussian(xc,yc,tensor,color,opacity);
-    }
-
-    //! Draw a 2d gaussian function \overloading.
-    template<typename tc>
-    CImg<T>& draw_gaussian(const float xc, const float yc, const float sigma,
-                           const tc *const color, const float opacity=1) {
-      return draw_gaussian(xc,yc,CImg<floatT>::diagonal(sigma,sigma),color,opacity);
-    }
-
-    //! Draw a 3d gaussian function \overloading.
-    template<typename t, typename tc>
-    CImg<T>& draw_gaussian(const float xc, const float yc, const float zc, const CImg<t>& tensor,
-                           const tc *const color, const float opacity=1) {
-      if (is_empty()) return *this;
-      typedef typename CImg<t>::Tfloat tfloat;
-      if (tensor._width!=3 || tensor._height!=3 || tensor._depth!=1 || tensor._spectrum!=1)
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_gaussian(): Specified tensor (%u,%u,%u,%u,%p) is not a 3x3 matrix.",
-                                    cimg_instance,
-                                    tensor._width,tensor._height,tensor._depth,tensor._spectrum,tensor._data);
-
-      const CImg<tfloat> invT = tensor.get_invert(), invT2 = (invT*invT)/(-2.0);
-      const tfloat a = invT2(0,0), b = 2*invT2(1,0), c = 2*invT2(2,0), d = invT2(1,1), e = 2*invT2(2,1), f = invT2(2,2);
-      const float nopacity = cimg::abs(opacity), copacity = 1 - std::max(opacity,0.0f);
-      const ulongT whd = (ulongT)_width*_height*_depth;
-      const tc *col = color;
-      cimg_forXYZ(*this,x,y,z) {
-        const float
-          dx = (x - xc), dy = (y - yc), dz = (z - zc),
-          val = (float)std::exp(a*dx*dx + b*dx*dy + c*dx*dz + d*dy*dy + e*dy*dz + f*dz*dz);
-        T *ptrd = data(x,y,z,0);
-        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
-        else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
-        col-=_spectrum;
-      }
-      return *this;
-    }
-
-    //! Draw a 3d gaussian function \overloading.
-    template<typename tc>
-    CImg<T>& draw_gaussian(const float xc, const float yc, const float zc, const float sigma,
-                           const tc *const color, const float opacity=1) {
-      return draw_gaussian(xc,yc,zc,CImg<floatT>::diagonal(sigma,sigma,sigma),color,opacity);
-    }
-
-    //! Draw a 3d object.
-    /**
-       \param x0 X-coordinate of the 3d object position
-       \param y0 Y-coordinate of the 3d object position
-       \param z0 Z-coordinate of the 3d object position
-       \param vertices Image Nx3 describing 3d point coordinates
-       \param primitives List of P primitives
-       \param colors List of P color (or textures)
-       \param opacities Image or list of P opacities
-       \param render_type d Render type (0=Points, 1=Lines, 2=Faces (no light), 3=Faces (flat), 4=Faces(Gouraud)
-       \param is_double_sided Tells if object faces have two sides or are oriented.
-       \param focale length of the focale (0 for parallel projection)
-       \param lightx X-coordinate of the light
-       \param lighty Y-coordinate of the light
-       \param lightz Z-coordinate of the light
-       \param specular_lightness Amount of specular light.
-       \param specular_shininess Shininess of the object
-    **/
-    template<typename tp, typename tf, typename tc, typename to>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImg<to>& opacities,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,opacities,render_type,
-                           is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    //! Draw a 3d object \simplification.
-    template<typename tp, typename tf, typename tc, typename to, typename tz>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImg<to>& opacities,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return _draw_object3d(0,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
-                            render_type,is_double_sided,focale,lightx,lighty,lightz,
-                            specular_lightness,specular_shininess,1);
-    }
-
-#ifdef cimg_use_board
-    template<typename tp, typename tf, typename tc, typename to>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImg<to>& opacities,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(board,x0,y0,z0,vertices,primitives,colors,opacities,render_type,
-                           is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    template<typename tp, typename tf, typename tc, typename to, typename tz>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImg<to>& opacities,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return _draw_object3d((void*)&board,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
-                            render_type,is_double_sided,focale,lightx,lighty,lightz,
-                            specular_lightness,specular_shininess,1);
-    }
-#endif
-
-    //! Draw a 3d object \simplification.
-    template<typename tp, typename tf, typename tc, typename to>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImgList<to>& opacities,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,opacities,render_type,
-                           is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    //! Draw a 3d object \simplification.
-    template<typename tp, typename tf, typename tc, typename to, typename tz>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImgList<to>& opacities,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return _draw_object3d(0,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
-                            render_type,is_double_sided,focale,lightx,lighty,lightz,
-                            specular_lightness,specular_shininess,1);
-    }
-
-#ifdef cimg_use_board
-    template<typename tp, typename tf, typename tc, typename to>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImgList<to>& opacities,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(board,x0,y0,z0,vertices,primitives,colors,opacities,render_type,
-                           is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    template<typename tp, typename tf, typename tc, typename to, typename tz>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors, const CImgList<to>& opacities,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return _draw_object3d((void*)&board,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
-                            render_type,is_double_sided,focale,lightx,lighty,lightz,
-                            specular_lightness,specular_shininess,1);
-    }
-#endif
-
-    //! Draw a 3d object \simplification.
-    template<typename tp, typename tf, typename tc>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::const_empty(),
-                           render_type,is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    //! Draw a 3d object \simplification.
-    template<typename tp, typename tf, typename tc, typename tz>
-    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::const_empty(),
-                           render_type,is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,zbuffer);
-    }
-
-#ifdef cimg_use_board
-    template<typename tp, typename tf, typename tc, typename to>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors,
-                           const unsigned int render_type=4,
-                           const bool is_double_sided=false, const float focale=700,
-                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
-                           const float specular_lightness=0.2f, const float specular_shininess=0.1f) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::const_empty(),
-                           render_type,is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,CImg<floatT>::empty());
-    }
-
-    template<typename tp, typename tf, typename tc, typename to, typename tz>
-    CImg<T>& draw_object3d(LibBoard::Board& board,
-                           const float x0, const float y0, const float z0,
-                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
-                           const CImgList<tc>& colors,
-                           const unsigned int render_type,
-                           const bool is_double_sided, const float focale,
-                           const float lightx, const float lighty, const float lightz,
-                           const float specular_lightness, const float specular_shininess,
-                           CImg<tz>& zbuffer) {
-      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::const_empty(),
-                           render_type,is_double_sided,focale,lightx,lighty,lightz,
-                           specular_lightness,specular_shininess,zbuffer);
-    }
-#endif
-
-    template<typename t, typename to>
-    static float __draw_object3d(const CImgList<t>& opacities, const unsigned int n_primitive, CImg<to>& opacity) {
-      if (n_primitive>=opacities._width || opacities[n_primitive].is_empty()) { opacity.assign(); return 1; }
-      if (opacities[n_primitive].size()==1) { opacity.assign(); return opacities(n_primitive,0); }
-      opacity.assign(opacities[n_primitive],true);
-      return 1.0f;
-    }
-
-    template<typename t, typename to>
-    static float __draw_object3d(const CImg<t>& opacities, const unsigned int n_primitive, CImg<to>& opacity) {
-      opacity.assign();
-      return n_primitive>=opacities._width?1.0f:(float)opacities[n_primitive];
-    }
-
-    template<typename t>
-    static float ___draw_object3d(const CImgList<t>& opacities, const unsigned int n_primitive) {
-      return n_primitive<opacities._width && opacities[n_primitive].size()==1?(float)opacities(n_primitive,0):1.0f;
-    }
-
-    template<typename t>
-    static float ___draw_object3d(const CImg<t>& opacities, const unsigned int n_primitive) {
-      return n_primitive<opacities._width?(float)opacities[n_primitive]:1.0f;
-    }
-
-    template<typename tz, typename tp, typename tf, typename tc, typename to>
-    CImg<T>& _draw_object3d(void *const pboard, CImg<tz>& zbuffer,
-                            const float X, const float Y, const float Z,
-                            const CImg<tp>& vertices,
-                            const CImgList<tf>& primitives,
-                            const CImgList<tc>& colors,
-                            const to& opacities,
-                            const unsigned int render_type,
-                            const bool is_double_sided, const float focale,
-                            const float lightx, const float lighty, const float lightz,
-                            const float specular_lightness, const float specular_shininess,
-                            const float sprite_scale) {
-      typedef typename cimg::superset2<tp,tz,float>::type tpfloat;
-      typedef typename to::value_type _to;
-      if (is_empty() || !vertices || !primitives) return *this;
-      CImg<char> error_message(1024);
-      if (!vertices.is_object3d(primitives,colors,opacities,false,error_message))
-        throw CImgArgumentException(_cimg_instance
-                                    "draw_object3d(): Invalid specified 3d object (%u,%u) (%s).",
-                                    cimg_instance,vertices._width,primitives._width,error_message.data());
-#ifndef cimg_use_board
-      if (pboard) return *this;
-#endif
-      if (render_type==5) cimg::mutex(10);  // Static variable used in this case, breaks thread-safety.
-
-      const float
-        nspec = 1 - (specular_lightness<0.0f?0.0f:(specular_lightness>1.0f?1.0f:specular_lightness)),
-        nspec2 = 1 + (specular_shininess<0.0f?0.0f:specular_shininess),
-        nsl1 = (nspec2 - 1)/cimg::sqr(nspec - 1),
-        nsl2 = 1 - 2*nsl1*nspec,
-        nsl3 = nspec2 - nsl1 - nsl2;
-
-      // Create light texture for phong-like rendering.
-      CImg<floatT> light_texture;
-      if (render_type==5) {
-        if (colors._width>primitives._width) {
-          static CImg<floatT> default_light_texture;
-          static const tc *lptr = 0;
-          static tc ref_values[64] = { 0 };
-          const CImg<tc>& img = colors.back();
-          bool is_same_texture = (lptr==img._data);
-          if (is_same_texture)
-            for (unsigned int r = 0, j = 0; j<8; ++j)
-              for (unsigned int i = 0; i<8; ++i)
-                if (ref_values[r++]!=img(i*img._width/9,j*img._height/9,0,(i + j)%img._spectrum)) {
-                  is_same_texture = false; break;
-                }
-          if (!is_same_texture || default_light_texture._spectrum<_spectrum) {
-            (default_light_texture.assign(img,false)/=255).resize(-100,-100,1,_spectrum);
-            lptr = colors.back().data();
-            for (unsigned int r = 0, j = 0; j<8; ++j)
-              for (unsigned int i = 0; i<8; ++i)
-                ref_values[r++] = img(i*img._width/9,j*img._height/9,0,(i + j)%img._spectrum);
-          }
-          light_texture.assign(default_light_texture,true);
-        } else {
-          static CImg<floatT> default_light_texture;
-          static float olightx = 0, olighty = 0, olightz = 0, ospecular_shininess = 0;
-          if (!default_light_texture ||
-              lightx!=olightx || lighty!=olighty || lightz!=olightz ||
-              specular_shininess!=ospecular_shininess || default_light_texture._spectrum<_spectrum) {
-            default_light_texture.assign(512,512);
-            const float
-              dlx = lightx - X,
-              dly = lighty - Y,
-              dlz = lightz - Z,
-              nl = cimg::hypot(dlx,dly,dlz),
-              nlx = (default_light_texture._width - 1)/2*(1 + dlx/nl),
-              nly = (default_light_texture._height - 1)/2*(1 + dly/nl),
-              white[] = { 1 };
-            default_light_texture.draw_gaussian(nlx,nly,default_light_texture._width/3.0f,white);
-            cimg_forXY(default_light_texture,x,y) {
-              const float factor = default_light_texture(x,y);
-              if (factor>nspec) default_light_texture(x,y) = std::min(2.0f,nsl1*factor*factor + nsl2*factor + nsl3);
-            }
-            default_light_texture.resize(-100,-100,1,_spectrum);
-            olightx = lightx; olighty = lighty; olightz = lightz; ospecular_shininess = specular_shininess;
-          }
-          light_texture.assign(default_light_texture,true);
-        }
-      }
-
-      // Compute 3d to 2d projection.
-      CImg<tpfloat> projections(vertices._width,2);
-      tpfloat parallzmin = cimg::type<tpfloat>::max();
-      const float absfocale = focale?cimg::abs(focale):0;
-      if (absfocale) {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(projections.size()>4096))
-        cimg_forX(projections,l) { // Perspective projection
-          const tpfloat
-            x = (tpfloat)vertices(l,0),
-            y = (tpfloat)vertices(l,1),
-            z = (tpfloat)vertices(l,2);
-          const tpfloat projectedz = z + Z + absfocale;
-          projections(l,1) = Y + absfocale*y/projectedz;
-          projections(l,0) = X + absfocale*x/projectedz;
-        }
-      } else {
-        cimg_pragma_openmp(parallel for cimg_openmp_if(projections.size()>4096))
-        cimg_forX(projections,l) { // Parallel projection
-          const tpfloat
-            x = (tpfloat)vertices(l,0),
-            y = (tpfloat)vertices(l,1),
-            z = (tpfloat)vertices(l,2);
-          if (z<parallzmin) parallzmin = z;
-          projections(l,1) = Y + y;
-          projections(l,0) = X + x;
-        }
-      }
-
-      const float _focale = absfocale?absfocale:(1e5f-parallzmin);
-      float zmax = 0;
-      if (zbuffer) zmax = vertices.get_shared_row(2).max();
-
-      // Compute visible primitives.
-      CImg<uintT> visibles(primitives._width,1,1,1,~0U);
-      CImg<tpfloat> zrange(primitives._width);
-      const tpfloat zmin = absfocale?(tpfloat)(1.5f - absfocale):cimg::type<tpfloat>::min();
-      bool is_forward = zbuffer?true:false;
-
-      cimg_pragma_openmp(parallel for cimg_openmp_if(primitives.size()>4096))
-      cimglist_for(primitives,l) {
-        const CImg<tf>& primitive = primitives[l];
-        switch (primitive.size()) {
-        case 1 : { // Point
-          CImg<_to> _opacity;
-          __draw_object3d(opacities,l,_opacity);
-          if (l<=colors.width() && (colors[l].size()!=_spectrum || _opacity)) is_forward = false;
-          const unsigned int i0 = (unsigned int)primitive(0);
-          const tpfloat z0 = Z + vertices(i0,2);
-          if (z0>zmin) {
-            visibles(l) = (unsigned int)l;
-            zrange(l) = z0;
-          }
-        } break;
-        case 5 : { // Sphere
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1);
-          const tpfloat
-            Xc = 0.5f*((float)vertices(i0,0) + (float)vertices(i1,0)),
-            Yc = 0.5f*((float)vertices(i0,1) + (float)vertices(i1,1)),
-            Zc = 0.5f*((float)vertices(i0,2) + (float)vertices(i1,2)),
-            _zc = Z + Zc,
-            zc = _zc + _focale,
-            xc = X + Xc*(absfocale?absfocale/zc:1),
-            yc = Y + Yc*(absfocale?absfocale/zc:1),
-            radius = 0.5f*cimg::hypot(vertices(i1,0) - vertices(i0,0),
-                                      vertices(i1,1) - vertices(i0,1),
-                                      vertices(i1,2) - vertices(i0,2))*(absfocale?absfocale/zc:1),
-            xm = xc - radius,
-            ym = yc - radius,
-            xM = xc + radius,
-            yM = yc + radius;
-          if (xM>=0 && xm<_width && yM>=0 && ym<_height && _zc>zmin) {
-            visibles(l) = (unsigned int)l;
-            zrange(l) = _zc;
-          }
-          is_forward = false;
-        } break;
-        case 2 : // Segment
-        case 6 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1);
-          const tpfloat
-            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
-            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2);
-          tpfloat xm, xM, ym, yM;
-          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
-          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
-          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin) {
-            visibles(l) = (unsigned int)l;
-            zrange(l) = (z0 + z1)/2;
-          }
-        } break;
-        case 3 :  // Triangle
-        case 9 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1),
-            i2 = (unsigned int)primitive(2);
-          const tpfloat
-            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
-            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2),
-            x2 = projections(i2,0), y2 = projections(i2,1), z2 = Z + vertices(i2,2);
-          tpfloat xm, xM, ym, yM;
-          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
-          if (x2<xm) xm = x2;
-          if (x2>xM) xM = x2;
-          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
-          if (y2<ym) ym = y2;
-          if (y2>yM) yM = y2;
-          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin && z2>zmin) {
-            const tpfloat d = (x1-x0)*(y2-y0) - (x2-x0)*(y1-y0);
-            if (is_double_sided || d<0) {
-              visibles(l) = (unsigned int)l;
-              zrange(l) = (z0 + z1 + z2)/3;
-            }
-          }
-        } break;
-        case 4 : // Rectangle
-        case 12 : {
-          const unsigned int
-            i0 = (unsigned int)primitive(0),
-            i1 = (unsigned int)primitive(1),
-            i2 = (unsigned int)primitive(2),
-            i3 = (unsigned int)primitive(3);
-          const tpfloat
-            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
-            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2),
-            x2 = projections(i2,0), y2 = projections(i2,1), z2 = Z + vertices(i2,2),
-            x3 = projections(i3,0), y3 = projections(i3,1), z3 = Z + vertices(i3,2);
-          tpfloat xm, xM, ym, yM;
-          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
-          if (x2<xm) xm = x2;
-          if (x2>xM) xM = x2;
-          if (x3<xm) xm = x3;
-          if (x3>xM) xM = x3;
-          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
-          if (y2<ym) ym = y2;
-          if (y2>yM) yM = y2;
-          if (y3<ym) ym = y3;
-          if (y3>yM) yM = y3;
-          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin && z2>zmin && z3>zmin) {
-            const float d = (x1 - x0)*(y2 - y0) - (x2 - x0)*(y1 - y0);
-            if (is_double_sided || d<0) {
-              visibles(l) = (unsigned int)l;
-              zrange(l) = (z0 + z1 + z2 + z3)/4;
-            }
-          }
-        } break;
-        default :
-          if (render_type==5) cimg::mutex(10,0);
-          throw CImgArgumentException(_cimg_instance
-                                      "draw_object3d(): Invalid primitive[%u] with size %u "
-                                      "(should have size 1,2,3,4,5,6,9 or 12).",
-                                      cimg_instance,
-                                      l,primitive.size());
-        }
-      }
-
-      // Force transparent primitives to be drawn last when zbuffer is activated
-      // (and if object contains no spheres or sprites).
-      if (is_forward)
-        cimglist_for(primitives,l)
-          if (___draw_object3d(opacities,l)!=1) zrange(l) = 2*zmax - zrange(l);
-
-      // Sort only visibles primitives.
-      unsigned int *p_visibles = visibles._data;
-      tpfloat *p_zrange = zrange._data;
-      const tpfloat *ptrz = p_zrange;
-      cimg_for(visibles,ptr,unsigned int) {
-        if (*ptr!=~0U) { *(p_visibles++) = *ptr; *(p_zrange++) = *ptrz; }
-        ++ptrz;
-      }
-      const unsigned int nb_visibles = (unsigned int)(p_zrange - zrange._data);
-      if (!nb_visibles) {
-        if (render_type==5) cimg::mutex(10,0);
-        return *this;
-      }
-      CImg<uintT> permutations;
-      CImg<tpfloat>(zrange._data,nb_visibles,1,1,1,true).sort(permutations,is_forward);
-
-      // Compute light properties
-      CImg<floatT> lightprops;
-      switch (render_type) {
-      case 3 : { // Flat Shading
-        lightprops.assign(nb_visibles);
-        cimg_pragma_openmp(parallel for cimg_openmp_if(nb_visibles>4096))
-        cimg_forX(lightprops,l) {
-          const CImg<tf>& primitive = primitives(visibles(permutations(l)));
-          const unsigned int psize = (unsigned int)primitive.size();
-          if (psize==3 || psize==4 || psize==9 || psize==12) {
-            const unsigned int
-              i0 = (unsigned int)primitive(0),
-              i1 = (unsigned int)primitive(1),
-              i2 = (unsigned int)primitive(2);
-            const tpfloat
-              x0 = (tpfloat)vertices(i0,0), y0 = (tpfloat)vertices(i0,1), z0 = (tpfloat)vertices(i0,2),
-              x1 = (tpfloat)vertices(i1,0), y1 = (tpfloat)vertices(i1,1), z1 = (tpfloat)vertices(i1,2),
-              x2 = (tpfloat)vertices(i2,0), y2 = (tpfloat)vertices(i2,1), z2 = (tpfloat)vertices(i2,2),
-              dx1 = x1 - x0, dy1 = y1 - y0, dz1 = z1 - z0,
-              dx2 = x2 - x0, dy2 = y2 - y0, dz2 = z2 - z0,
-              nx = dy1*dz2 - dz1*dy2,
-              ny = dz1*dx2 - dx1*dz2,
-              nz = dx1*dy2 - dy1*dx2,
-              norm = 1e-5f + cimg::hypot(nx,ny,nz),
-              lx = X + (x0 + x1 + x2)/3 - lightx,
-              ly = Y + (y0 + y1 + y2)/3 - lighty,
-              lz = Z + (z0 + z1 + z2)/3 - lightz,
-              nl = 1e-5f + cimg::hypot(lx,ly,lz),
-              factor = std::max(cimg::abs(-lx*nx - ly*ny - lz*nz)/(norm*nl),(tpfloat)0);
-            lightprops[l] = factor<=nspec?factor:(nsl1*factor*factor + nsl2*factor + nsl3);
-          } else lightprops[l] = 1;
-        }
-      } break;
-
-      case 4 : // Gouraud Shading
-      case 5 : { // Phong-Shading
-        CImg<tpfloat> vertices_normals(vertices._width,6,1,1,0);
-        cimg_pragma_openmp(parallel for cimg_openmp_if(nb_visibles>4096))
-        for (unsigned int l = 0; l<nb_visibles; ++l) {
-          const CImg<tf>& primitive = primitives[visibles(l)];
-          const unsigned int psize = (unsigned int)primitive.size();
-          const bool
-            triangle_flag = (psize==3) || (psize==9),
-            rectangle_flag = (psize==4) || (psize==12);
-          if (triangle_flag || rectangle_flag) {
-            const unsigned int
-              i0 = (unsigned int)primitive(0),
-              i1 = (unsigned int)primitive(1),
-              i2 = (unsigned int)primitive(2),
-              i3 = rectangle_flag?(unsigned int)primitive(3):0;
-            const tpfloat
-              x0 = (tpfloat)vertices(i0,0), y0 = (tpfloat)vertices(i0,1), z0 = (tpfloat)vertices(i0,2),
-              x1 = (tpfloat)vertices(i1,0), y1 = (tpfloat)vertices(i1,1), z1 = (tpfloat)vertices(i1,2),
-              x2 = (tpfloat)vertices(i2,0), y2 = (tpfloat)vertices(i2,1), z2 = (tpfloat)vertices(i2,2),
-              dx1 = x1 - x0, dy1 = y1 - y0, dz1 = z1 - z0,
-              dx2 = x2 - x0, dy2 = y2 - y0, dz2 = z2 - z0,
-              nnx = dy1*dz2 - dz1*dy2,
-              nny = dz1*dx2 - dx1*dz2,
-              nnz = dx1*dy2 - dy1*dx2,
-              norm = 1e-5f + cimg::hypot(nnx,nny,nnz),
-              nx = nnx/norm,
-              ny = nny/norm,
-              nz = nnz/norm;
-            unsigned int ix = 0, iy = 1, iz = 2;
-            if (is_double_sided && nz>0) { ix = 3; iy = 4; iz = 5; }
-            vertices_normals(i0,ix)+=nx; vertices_normals(i0,iy)+=ny; vertices_normals(i0,iz)+=nz;
-            vertices_normals(i1,ix)+=nx; vertices_normals(i1,iy)+=ny; vertices_normals(i1,iz)+=nz;
-            vertices_normals(i2,ix)+=nx; vertices_normals(i2,iy)+=ny; vertices_normals(i2,iz)+=nz;
-            if (rectangle_flag) {
-              vertices_normals(i3,ix)+=nx; vertices_normals(i3,iy)+=ny; vertices_normals(i3,iz)+=nz;
-            }
-          }
-        }
-
-        if (is_double_sided) cimg_forX(vertices_normals,p) {
-            const float
-              nx0 = vertices_normals(p,0), ny0 = vertices_normals(p,1), nz0 = vertices_normals(p,2),
-              nx1 = vertices_normals(p,3), ny1 = vertices_normals(p,4), nz1 = vertices_normals(p,5),
-              n0 = nx0*nx0 + ny0*ny0 + nz0*nz0, n1 = nx1*nx1 + ny1*ny1 + nz1*nz1;
-            if (n1>n0) {
-              vertices_normals(p,0) = -nx1;
-              vertices_normals(p,1) = -ny1;
-              vertices_normals(p,2) = -nz1;
-            }
-          }
-
-        if (render_type==4) {
-          lightprops.assign(vertices._width);
-          cimg_pragma_openmp(parallel for cimg_openmp_if(nb_visibles>4096))
-          cimg_forX(lightprops,l) {
-            const tpfloat
-              nx = vertices_normals(l,0),
-              ny = vertices_normals(l,1),
-              nz = vertices_normals(l,2),
-              norm = 1e-5f + cimg::hypot(nx,ny,nz),
-              lx = X + vertices(l,0) - lightx,
-              ly = Y + vertices(l,1) - lighty,
-              lz = Z + vertices(l,2) - lightz,
-              nl = 1e-5f + cimg::hypot(lx,ly,lz),
-              factor = std::max((-lx*nx - ly*ny - lz*nz)/(norm*nl),(tpfloat)0);
-            lightprops[l] = factor<=nspec?factor:(nsl1*factor*factor + nsl2*factor + nsl3);
-          }
-        } else {
-          const unsigned int
-            lw2 = light_texture._width/2 - 1,
-            lh2 = light_texture._height/2 - 1;
-          lightprops.assign(vertices._width,2);
-          cimg_pragma_openmp(parallel for cimg_openmp_if(nb_visibles>4096))
-          cimg_forX(lightprops,l) {
-            const tpfloat
-              nx = vertices_normals(l,0),
-              ny = vertices_normals(l,1),
-              nz = vertices_normals(l,2),
-              norm = 1e-5f + cimg::hypot(nx,ny,nz),
-              nnx = nx/norm,
-              nny = ny/norm;
-            lightprops(l,0) = lw2*(1 + nnx);
-            lightprops(l,1) = lh2*(1 + nny);
-          }
-        }
-      } break;
-      }
-
-      // Draw visible primitives
-      const CImg<tc> default_color(1,_spectrum,1,1,(tc)200);
-      CImg<_to> _opacity;
-
-      for (unsigned int l = 0; l<nb_visibles; ++l) {
-        const unsigned int n_primitive = visibles(permutations(l));
-        const CImg<tf>& primitive = primitives[n_primitive];
-        const CImg<tc>
-          &__color = n_primitive<colors._width?colors[n_primitive]:CImg<tc>(),
-          _color = (__color && __color.size()!=_spectrum && __color._spectrum<_spectrum)?
-            __color.get_resize(-100,-100,-100,_spectrum,0):CImg<tc>(),
-          &color = _color?_color:(__color?__color:default_color);
-        const tc *const pcolor = color._data;
-        const float opacity = __draw_object3d(opacities,n_primitive,_opacity);
-
-#ifdef cimg_use_board
-        LibBoard::Board &board = *(LibBoard::Board*)pboard;
-#endif
-
-        switch (primitive.size()) {
-        case 1 : { // Colored point or sprite
-          const unsigned int n0 = (unsigned int)primitive[0];
-          const int x0 = (int)projections(n0,0), y0 = (int)projections(n0,1);
-
-          if (_opacity.is_empty()) { // Scalar opacity.
-
-            if (color.size()==_spectrum) { // Colored point.
-              draw_point(x0,y0,pcolor,opacity);
-#ifdef cimg_use_board
-              if (pboard) {
-                board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-                board.drawDot((float)x0,height()-(float)y0);
-              }
-#endif
-            } else { // Sprite.
-              const tpfloat z = Z + vertices(n0,2);
-              const float factor = focale<0?1:sprite_scale*(absfocale?absfocale/(z + absfocale):1);
-              const unsigned int
-                _sw = (unsigned int)(color._width*factor),
-                _sh = (unsigned int)(color._height*factor),
-                sw = _sw?_sw:1, sh = _sh?_sh:1;
-              const int nx0 = x0 - (int)sw/2, ny0 = y0 - (int)sh/2;
-              if (sw<=3*_width/2 && sh<=3*_height/2 &&
-                  (nx0 + (int)sw/2>=0 || nx0 - (int)sw/2<width() || ny0 + (int)sh/2>=0 || ny0 - (int)sh/2<height())) {
-                const CImg<tc>
-                  _sprite = (sw!=color._width || sh!=color._height)?
-                    color.get_resize(sw,sh,1,-100,render_type<=3?1:3):CImg<tc>(),
-                  &sprite = _sprite?_sprite:color;
-                draw_image(nx0,ny0,sprite,opacity);
-#ifdef cimg_use_board
-                if (pboard) {
-                  board.setPenColorRGBi(128,128,128);
-                  board.setFillColor(LibBoard::Color::Null);
-                  board.drawRectangle((float)nx0,height() - (float)ny0,sw,sh);
-                }
-#endif
-              }
-            }
-          } else { // Opacity mask.
-            const tpfloat z = Z + vertices(n0,2);
-            const float factor = focale<0?1:sprite_scale*(absfocale?absfocale/(z + absfocale):1);
-            const unsigned int
-              _sw = (unsigned int)(std::max(color._width,_opacity._width)*factor),
-              _sh = (unsigned int)(std::max(color._height,_opacity._height)*factor),
-              sw = _sw?_sw:1, sh = _sh?_sh:1;
-            const int nx0 = x0 - (int)sw/2, ny0 = y0 - (int)sh/2;
-            if (sw<=3*_width/2 && sh<=3*_height/2 &&
-                (nx0 + (int)sw/2>=0 || nx0 - (int)sw/2<width() || ny0 + (int)sh/2>=0 || ny0 - (int)sh/2<height())) {
-              const CImg<tc>
-                _sprite = (sw!=color._width || sh!=color._height)?
-                  color.get_resize(sw,sh,1,-100,render_type<=3?1:3):CImg<tc>(),
-                &sprite = _sprite?_sprite:color;
-              const CImg<_to>
-                _nopacity = (sw!=_opacity._width || sh!=_opacity._height)?
-                  _opacity.get_resize(sw,sh,1,-100,render_type<=3?1:3):CImg<_to>(),
-                &nopacity = _nopacity?_nopacity:_opacity;
-              draw_image(nx0,ny0,sprite,nopacity);
-#ifdef cimg_use_board
-              if (pboard) {
-                board.setPenColorRGBi(128,128,128);
-                board.setFillColor(LibBoard::Color::Null);
-                board.drawRectangle((float)nx0,height() - (float)ny0,sw,sh);
-              }
-#endif
-            }
-          }
-        } break;
-        case 2 : { // Colored line
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1];
-          const int
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale;
-          if (render_type) {
-            if (zbuffer) draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opacity);
-            else draw_line(x0,y0,x1,y1,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,x1,height() - (float)y1);
-            }
-#endif
-          } else {
-            draw_point(x0,y0,pcolor,opacity).draw_point(x1,y1,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-            }
-#endif
-          }
-        } break;
-        case 5 : { // Colored sphere
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1],
-            is_wireframe = (unsigned int)primitive[2];
-          const float
-            Xc = 0.5f*((float)vertices(n0,0) + (float)vertices(n1,0)),
-            Yc = 0.5f*((float)vertices(n0,1) + (float)vertices(n1,1)),
-            Zc = 0.5f*((float)vertices(n0,2) + (float)vertices(n1,2)),
-            zc = Z + Zc + _focale,
-            xc = X + Xc*(absfocale?absfocale/zc:1),
-            yc = Y + Yc*(absfocale?absfocale/zc:1),
-            radius = 0.5f*cimg::hypot(vertices(n1,0) - vertices(n0,0),
-                                      vertices(n1,1) - vertices(n0,1),
-                                      vertices(n1,2) - vertices(n0,2))*(absfocale?absfocale/zc:1);
-          switch (render_type) {
-          case 0 :
-            draw_point((int)xc,(int)yc,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawDot(xc,height() - yc);
-            }
-#endif
-            break;
-          case 1 :
-            draw_circle((int)xc,(int)yc,(int)radius,pcolor,opacity,~0U);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.setFillColor(LibBoard::Color::Null);
-              board.drawCircle(xc,height() - yc,radius);
-            }
-#endif
-            break;
-          default :
-            if (is_wireframe) draw_circle((int)xc,(int)yc,(int)radius,pcolor,opacity,~0U);
-            else draw_circle((int)xc,(int)yc,(int)radius,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              if (!is_wireframe) board.fillCircle(xc,height() - yc,radius);
-              else {
-                board.setFillColor(LibBoard::Color::Null);
-                board.drawCircle(xc,height() - yc,radius);
-              }
-            }
-#endif
-            break;
-          }
-        } break;
-        case 6 : { // Textured line
-          if (!__color) {
-            if (render_type==5) cimg::mutex(10,0);
-            throw CImgArgumentException(_cimg_instance
-                                        "draw_object3d(): Undefined texture for line primitive [%u].",
-                                        cimg_instance,n_primitive);
-          }
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1];
-          const int
-            tx0 = (int)primitive[2], ty0 = (int)primitive[3],
-            tx1 = (int)primitive[4], ty1 = (int)primitive[5],
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale;
-          if (render_type) {
-            if (zbuffer) draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opacity);
-            else draw_line(x0,y0,x1,y1,color,tx0,ty0,tx1,ty1,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,(float)x1,height() - (float)y1);
-            }
-#endif
-          } else {
-            draw_point(x0,y0,color.get_vector_at(tx0<=0?0:tx0>=color.width()?color.width() - 1:tx0,
-                                                 ty0<=0?0:ty0>=color.height()?color.height() - 1:ty0)._data,opacity).
-              draw_point(x1,y1,color.get_vector_at(tx1<=0?0:tx1>=color.width()?color.width() - 1:tx1,
-                                                   ty1<=0?0:ty1>=color.height()?color.height() - 1:ty1)._data,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-            }
-#endif
-          }
-        } break;
-        case 3 : { // Colored triangle
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1],
-            n2 = (unsigned int)primitive[2];
-          const int
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
-            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale,
-            z2 = vertices(n2,2) + Z + _focale;
-          switch (render_type) {
-          case 0 :
-            draw_point(x0,y0,pcolor,opacity).draw_point(x1,y1,pcolor,opacity).draw_point(x2,y2,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-              board.drawDot((float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 1 :
-            if (zbuffer)
-              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opacity).draw_line(zbuffer,x0,y0,z0,x2,y2,z2,pcolor,opacity).
-                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,pcolor,opacity);
-            else
-              draw_line(x0,y0,x1,y1,pcolor,opacity).draw_line(x0,y0,x2,y2,pcolor,opacity).
-                draw_line(x1,y1,x2,y2,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,(float)x1,height() - (float)y1);
-              board.drawLine((float)x0,height() - (float)y0,(float)x2,height() - (float)y2);
-              board.drawLine((float)x1,height() - (float)y1,(float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 2 :
-            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opacity);
-            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 3 :
-            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opacity,lightprops(l));
-            else _draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opacity,lightprops(l));
-#ifdef cimg_use_board
-            if (pboard) {
-              const float lp = std::min(lightprops(l),1);
-              board.setPenColorRGBi((unsigned char)(color[0]*lp),
-                                     (unsigned char)(color[1]*lp),
-                                     (unsigned char)(color[2]*lp),
-                                     (unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 4 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,
-                            lightprops(n0),lightprops(n1),lightprops(n2),opacity);
-            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,lightprops(n0),lightprops(n1),lightprops(n2),opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi((unsigned char)(color[0]),
-                                     (unsigned char)(color[1]),
-                                     (unsigned char)(color[2]),
-                                     (unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,lightprops(n0),
-                                         (float)x1,height() - (float)y1,lightprops(n1),
-                                         (float)x2,height() - (float)y2,lightprops(n2));
-            }
-#endif
-            break;
-          case 5 : {
-            const unsigned int
-              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
-              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
-              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1);
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              const float
-                l0 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n0,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n0,1)))),
-                l1 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n1,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n1,1)))),
-                l2 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n2,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n2,1))));
-              board.setPenColorRGBi((unsigned char)(color[0]),
-                                     (unsigned char)(color[1]),
-                                     (unsigned char)(color[2]),
-                                     (unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,l0,
-                                         (float)x1,height() - (float)y1,l1,
-                                         (float)x2,height() - (float)y2,l2);
-            }
-#endif
-          } break;
-          }
-        } break;
-        case 4 : { // Colored rectangle
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1],
-            n2 = (unsigned int)primitive[2],
-            n3 = (unsigned int)primitive[3];
-          const int
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
-            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1),
-            x3 = (int)projections(n3,0), y3 = (int)projections(n3,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale,
-            z2 = vertices(n2,2) + Z + _focale,
-            z3 = vertices(n3,2) + Z + _focale;
-
-          switch (render_type) {
-          case 0 :
-            draw_point(x0,y0,pcolor,opacity).draw_point(x1,y1,pcolor,opacity).
-              draw_point(x2,y2,pcolor,opacity).draw_point(x3,y3,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-              board.drawDot((float)x2,height() - (float)y2);
-              board.drawDot((float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 1 :
-            if (zbuffer)
-              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opacity).draw_line(zbuffer,x1,y1,z1,x2,y2,z2,pcolor,opacity).
-                draw_line(zbuffer,x2,y2,z2,x3,y3,z3,pcolor,opacity).draw_line(zbuffer,x3,y3,z3,x0,y0,z0,pcolor,opacity);
-            else
-              draw_line(x0,y0,x1,y1,pcolor,opacity).draw_line(x1,y1,x2,y2,pcolor,opacity).
-                draw_line(x2,y2,x3,y3,pcolor,opacity).draw_line(x3,y3,x0,y0,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,(float)x1,height() - (float)y1);
-              board.drawLine((float)x1,height() - (float)y1,(float)x2,height() - (float)y2);
-              board.drawLine((float)x2,height() - (float)y2,(float)x3,height() - (float)y3);
-              board.drawLine((float)x3,height() - (float)y3,(float)x0,height() - (float)y0);
-            }
-#endif
-            break;
-          case 2 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,opacity);
-            else
-              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opacity).draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x2,height() - (float)y2,
-                                 (float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 3 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opacity,lightprops(l)).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,opacity,lightprops(l));
-            else
-              _draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opacity,lightprops(l)).
-                _draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,opacity,lightprops(l));
-#ifdef cimg_use_board
-            if (pboard) {
-              const float lp = std::min(lightprops(l),1);
-              board.setPenColorRGBi((unsigned char)(color[0]*lp),
-                                     (unsigned char)(color[1]*lp),
-                                     (unsigned char)(color[2]*lp),(unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x2,height() - (float)y2,
-                                 (float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 4 : {
-            const float
-              lightprop0 = lightprops(n0), lightprop1 = lightprops(n1),
-              lightprop2 = lightprops(n2), lightprop3 = lightprops(n3);
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,lightprop0,lightprop1,lightprop2,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,lightprop0,lightprop2,lightprop3,opacity);
-            else
-              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,lightprop0,lightprop1,lightprop2,opacity).
-                draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,lightprop0,lightprop2,lightprop3,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi((unsigned char)(color[0]),
-                                     (unsigned char)(color[1]),
-                                     (unsigned char)(color[2]),
-                                     (unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,lightprop0,
-                                         (float)x1,height() - (float)y1,lightprop1,
-                                         (float)x2,height() - (float)y2,lightprop2);
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,lightprop0,
-                                         (float)x2,height() - (float)y2,lightprop2,
-                                         (float)x3,height() - (float)y3,lightprop3);
-            }
-#endif
-          } break;
-          case 5 : {
-            const unsigned int
-              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
-              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
-              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1),
-              lx3 = (unsigned int)lightprops(n3,0), ly3 = (unsigned int)lightprops(n3,1);
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opacity);
-            else
-              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity).
-                draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              const float
-                l0 = light_texture((int)(light_texture.width()/2*(1 + lx0)), (int)(light_texture.height()/2*(1 + ly0))),
-                l1 = light_texture((int)(light_texture.width()/2*(1 + lx1)), (int)(light_texture.height()/2*(1 + ly1))),
-                l2 = light_texture((int)(light_texture.width()/2*(1 + lx2)), (int)(light_texture.height()/2*(1 + ly2))),
-                l3 = light_texture((int)(light_texture.width()/2*(1 + lx3)), (int)(light_texture.height()/2*(1 + ly3)));
-              board.setPenColorRGBi((unsigned char)(color[0]),
-                                     (unsigned char)(color[1]),
-                                     (unsigned char)(color[2]),
-                                     (unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,l0,
-                                         (float)x1,height() - (float)y1,l1,
-                                         (float)x2,height() - (float)y2,l2);
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,l0,
-                                         (float)x2,height() - (float)y2,l2,
-                                         (float)x3,height() - (float)y3,l3);
-            }
-#endif
-          } break;
-          }
-        } break;
-        case 9 : { // Textured triangle
-          if (!__color) {
-            if (render_type==5) cimg::mutex(10,0);
-            throw CImgArgumentException(_cimg_instance
-                                        "draw_object3d(): Undefined texture for triangle primitive [%u].",
-                                        cimg_instance,n_primitive);
-          }
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1],
-            n2 = (unsigned int)primitive[2];
-          const int
-            tx0 = (int)primitive[3], ty0 = (int)primitive[4],
-            tx1 = (int)primitive[5], ty1 = (int)primitive[6],
-            tx2 = (int)primitive[7], ty2 = (int)primitive[8],
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
-            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale,
-            z2 = vertices(n2,2) + Z + _focale;
-          switch (render_type) {
-          case 0 :
-            draw_point(x0,y0,color.get_vector_at(tx0<=0?0:tx0>=color.width()?color.width() - 1:tx0,
-                                                 ty0<=0?0:ty0>=color.height()?color.height() - 1:ty0)._data,opacity).
-              draw_point(x1,y1,color.get_vector_at(tx1<=0?0:tx1>=color.width()?color.width() - 1:tx1,
-                                                   ty1<=0?0:ty1>=color.height()?color.height() - 1:ty1)._data,opacity).
-              draw_point(x2,y2,color.get_vector_at(tx2<=0?0:tx2>=color.width()?color.width() - 1:tx2,
-                                                   ty2<=0?0:ty2>=color.height()?color.height() - 1:ty2)._data,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-              board.drawDot((float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 1 :
-            if (zbuffer)
-              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opacity).
-                draw_line(zbuffer,x0,y0,z0,x2,y2,z2,color,tx0,ty0,tx2,ty2,opacity).
-                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opacity);
-            else
-              draw_line(x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opacity).
-                draw_line(x0,y0,z0,x2,y2,z2,color,tx0,ty0,tx2,ty2,opacity).
-                draw_line(x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,(float)x1,height() - (float)y1);
-              board.drawLine((float)x0,height() - (float)y0,(float)x2,height() - (float)y2);
-              board.drawLine((float)x1,height() - (float)y1,(float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 2 :
-            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity);
-            else draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 3 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity,lightprops(l));
-            else draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity,lightprops(l));
-#ifdef cimg_use_board
-            if (pboard) {
-              const float lp = std::min(lightprops(l),1);
-              board.setPenColorRGBi((unsigned char)(128*lp),
-                                    (unsigned char)(128*lp),
-                                    (unsigned char)(128*lp),
-                                    (unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-            }
-#endif
-            break;
-          case 4 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            lightprops(n0),lightprops(n1),lightprops(n2),opacity);
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            lightprops(n0),lightprops(n1),lightprops(n2),opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,lightprops(n0),
-                                        (float)x1,height() - (float)y1,lightprops(n1),
-                                        (float)x2,height() - (float)y2,lightprops(n2));
-            }
-#endif
-            break;
-          case 5 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,
-                            (unsigned int)lightprops(n0,0),(unsigned int)lightprops(n0,1),
-                            (unsigned int)lightprops(n1,0),(unsigned int)lightprops(n1,1),
-                            (unsigned int)lightprops(n2,0),(unsigned int)lightprops(n2,1),
-                            opacity);
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,
-                            (unsigned int)lightprops(n0,0),(unsigned int)lightprops(n0,1),
-                            (unsigned int)lightprops(n1,0),(unsigned int)lightprops(n1,1),
-                            (unsigned int)lightprops(n2,0),(unsigned int)lightprops(n2,1),
-                            opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              const float
-                l0 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n0,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n0,1)))),
-                l1 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n1,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n1,1)))),
-                l2 = light_texture((int)(light_texture.width()/2*(1 + lightprops(n2,0))),
-                                   (int)(light_texture.height()/2*(1 + lightprops(n2,1))));
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,l0,
-                                        (float)x1,height() - (float)y1,l1,
-                                        (float)x2,height() - (float)y2,l2);
-            }
-#endif
-            break;
-          }
-        } break;
-        case 12 : { // Textured quadrangle
-          if (!__color) {
-            if (render_type==5) cimg::mutex(10,0);
-            throw CImgArgumentException(_cimg_instance
-                                        "draw_object3d(): Undefined texture for quadrangle primitive [%u].",
-                                        cimg_instance,n_primitive);
-          }
-          const unsigned int
-            n0 = (unsigned int)primitive[0],
-            n1 = (unsigned int)primitive[1],
-            n2 = (unsigned int)primitive[2],
-            n3 = (unsigned int)primitive[3];
-          const int
-            tx0 = (int)primitive[4], ty0 = (int)primitive[5],
-            tx1 = (int)primitive[6], ty1 = (int)primitive[7],
-            tx2 = (int)primitive[8], ty2 = (int)primitive[9],
-            tx3 = (int)primitive[10], ty3 = (int)primitive[11],
-            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
-            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
-            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1),
-            x3 = (int)projections(n3,0), y3 = (int)projections(n3,1);
-          const float
-            z0 = vertices(n0,2) + Z + _focale,
-            z1 = vertices(n1,2) + Z + _focale,
-            z2 = vertices(n2,2) + Z + _focale,
-            z3 = vertices(n3,2) + Z + _focale;
-
-          switch (render_type) {
-          case 0 :
-            draw_point(x0,y0,color.get_vector_at(tx0<=0?0:tx0>=color.width()?color.width() - 1:tx0,
-                                                 ty0<=0?0:ty0>=color.height()?color.height() - 1:ty0)._data,opacity).
-              draw_point(x1,y1,color.get_vector_at(tx1<=0?0:tx1>=color.width()?color.width() - 1:tx1,
-                                                   ty1<=0?0:ty1>=color.height()?color.height() - 1:ty1)._data,opacity).
-              draw_point(x2,y2,color.get_vector_at(tx2<=0?0:tx2>=color.width()?color.width() - 1:tx2,
-                                                   ty2<=0?0:ty2>=color.height()?color.height() - 1:ty2)._data,opacity).
-              draw_point(x3,y3,color.get_vector_at(tx3<=0?0:tx3>=color.width()?color.width() - 1:tx3,
-                                                   ty3<=0?0:ty3>=color.height()?color.height() - 1:ty3)._data,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawDot((float)x0,height() - (float)y0);
-              board.drawDot((float)x1,height() - (float)y1);
-              board.drawDot((float)x2,height() - (float)y2);
-              board.drawDot((float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 1 :
-            if (zbuffer)
-              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opacity).
-                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opacity).
-                draw_line(zbuffer,x2,y2,z2,x3,y3,z3,color,tx2,ty2,tx3,ty3,opacity).
-                draw_line(zbuffer,x3,y3,z3,x0,y0,z0,color,tx3,ty3,tx0,ty0,opacity);
-            else
-              draw_line(x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opacity).
-                draw_line(x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opacity).
-                draw_line(x2,y2,z2,x3,y3,z3,color,tx2,ty2,tx3,ty3,opacity).
-                draw_line(x3,y3,z3,x0,y0,z0,color,tx3,ty3,tx0,ty0,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.drawLine((float)x0,height() - (float)y0,(float)x1,height() - (float)y1);
-              board.drawLine((float)x1,height() - (float)y1,(float)x2,height() - (float)y2);
-              board.drawLine((float)x2,height() - (float)y2,(float)x3,height() - (float)y3);
-              board.drawLine((float)x3,height() - (float)y3,(float)x0,height() - (float)y0);
-            }
-#endif
-            break;
-          case 2 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opacity);
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity).
-                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x2,height() - (float)y2,
-                                 (float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 3 :
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity,lightprops(l)).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opacity,lightprops(l));
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opacity,lightprops(l)).
-                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opacity,lightprops(l));
-#ifdef cimg_use_board
-            if (pboard) {
-              const float lp = std::min(lightprops(l),1);
-              board.setPenColorRGBi((unsigned char)(128*lp),
-                                     (unsigned char)(128*lp),
-                                     (unsigned char)(128*lp),
-                                     (unsigned char)(opacity*255));
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x1,height() - (float)y1,
-                                 (float)x2,height() - (float)y2);
-              board.fillTriangle((float)x0,height() - (float)y0,
-                                 (float)x2,height() - (float)y2,
-                                 (float)x3,height() - (float)y3);
-            }
-#endif
-            break;
-          case 4 : {
-            const float
-              lightprop0 = lightprops(n0), lightprop1 = lightprops(n1),
-              lightprop2 = lightprops(n2), lightprop3 = lightprops(n3);
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            lightprop0,lightprop1,lightprop2,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,
-                              lightprop0,lightprop2,lightprop3,opacity);
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            lightprop0,lightprop1,lightprop2,opacity).
-                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,
-                              lightprop0,lightprop2,lightprop3,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,lightprop0,
-                                         (float)x1,height() - (float)y1,lightprop1,
-                                         (float)x2,height() - (float)y2,lightprop2);
-              board.fillGouraudTriangle((float)x0,height()  -(float)y0,lightprop0,
-                                         (float)x2,height() - (float)y2,lightprop2,
-                                         (float)x3,height() - (float)y3,lightprop3);
-            }
-#endif
-          } break;
-          case 5 : {
-            const unsigned int
-              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
-              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
-              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1),
-              lx3 = (unsigned int)lightprops(n3,0), ly3 = (unsigned int)lightprops(n3,1);
-            if (zbuffer)
-              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity).
-                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,
-                              light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opacity);
-            else
-              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,
-                            light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opacity).
-                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,
-                              light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opacity);
-#ifdef cimg_use_board
-            if (pboard) {
-              const float
-                l0 = light_texture((int)(light_texture.width()/2*(1 + lx0)), (int)(light_texture.height()/2*(1 + ly0))),
-                l1 = light_texture((int)(light_texture.width()/2*(1 + lx1)), (int)(light_texture.height()/2*(1 + ly1))),
-                l2 = light_texture((int)(light_texture.width()/2*(1 + lx2)), (int)(light_texture.height()/2*(1 + ly2))),
-                l3 = light_texture((int)(light_texture.width()/2*(1 + lx3)), (int)(light_texture.height()/2*(1 + ly3)));
-              board.setPenColorRGBi(128,128,128,(unsigned char)(opacity*255));
-              board.fillGouraudTriangle((float)x0,height() - (float)y0,l0,
-                                         (float)x1,height() - (float)y1,l1,
-                                         (float)x2,height() - (float)y2,l2);
-              board.fillGouraudTriangle((float)x0,height()  -(float)y0,l0,
-                                         (float)x2,height() - (float)y2,l2,
-                                         (float)x3,height() - (float)y3,l3);
-            }
-#endif
-          } break;
-          }
-        } break;
-        }
-      }
-
-      if (render_type==5) cimg::mutex(10,0);
-      return *this;
-    }
-
-    //@}
-    //---------------------------
-    //
-    //! \name Data Input
-    //@{
-    //---------------------------
-
-    //! Launch simple interface to select a shape from an image.
-    /**
-       \param disp Display window to use.
-       \param feature_type Type of feature to select. Can be <tt>{ 0=point | 1=line | 2=rectangle | 3=ellipse }</tt>.
-       \param XYZ Pointer to 3 values X,Y,Z which tells about the projection point coordinates, for volumetric images.
-    **/
-    CImg<T>& select(CImgDisplay &disp,
-                    const unsigned int feature_type=2, unsigned int *const XYZ=0,
-                    const bool exit_on_anykey=false) {
-      return get_select(disp,feature_type,XYZ,exit_on_anykey).move_to(*this);
-    }
-
-    //! Simple interface to select a shape from an image \overloading.
-    CImg<T>& select(const char *const title,
-                    const unsigned int feature_type=2, unsigned int *const XYZ=0,
-                    const bool exit_on_anykey=false) {
-      return get_select(title,feature_type,XYZ,exit_on_anykey).move_to(*this);
-    }
-
-    //! Simple interface to select a shape from an image \newinstance.
-    CImg<intT> get_select(CImgDisplay &disp,
-                          const unsigned int feature_type=2, unsigned int *const XYZ=0,
-                          const bool exit_on_anykey=false) const {
-      return _select(disp,0,feature_type,XYZ,0,0,0,exit_on_anykey,true,false);
-    }
-
-    //! Simple interface to select a shape from an image \newinstance.
-    CImg<intT> get_select(const char *const title,
-                          const unsigned int feature_type=2, unsigned int *const XYZ=0,
-                          const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      return _select(disp,title,feature_type,XYZ,0,0,0,exit_on_anykey,true,false);
-    }
-
-    CImg<intT> _select(CImgDisplay &disp, const char *const title,
-                       const unsigned int feature_type, unsigned int *const XYZ,
-                       const int origX, const int origY, const int origZ,
-                       const bool exit_on_anykey,
-                       const bool reset_view3d,
-                       const bool force_display_z_coord) const {
-      if (is_empty()) return CImg<intT>(1,feature_type==0?3:6,1,1,-1);
-      if (!disp) {
-        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,1);
-        if (!title) disp.set_title("CImg<%s> (%ux%ux%ux%u)",pixel_type(),_width,_height,_depth,_spectrum);
-      } else if (title) disp.set_title("%s",title);
-
-      CImg<T> thumb;
-      if (width()>disp.screen_width() || height()>disp.screen_height())
-        get_resize(cimg_fitscreen(width(),height(),1),1,-100).move_to(thumb);
-
-      const unsigned int old_normalization = disp.normalization();
-      bool old_is_resized = disp.is_resized();
-      disp._normalization = 0;
-      disp.show().set_key(0).set_wheel().show_mouse();
-
-      static const unsigned char foreground_color[] = { 255,255,255 }, background_color[] = { 0,0,0 };
-
-      int area = 0, starting_area = 0, clicked_area = 0, phase = 0,
-        X0 = (int)((XYZ?XYZ[0]:(_width - 1)/2)%_width),
-        Y0 = (int)((XYZ?XYZ[1]:(_height - 1)/2)%_height),
-        Z0 = (int)((XYZ?XYZ[2]:(_depth - 1)/2)%_depth),
-        X1 =-1, Y1 = -1, Z1 = -1,
-        X3d = -1, Y3d = -1,
-        oX3d = X3d, oY3d = -1,
-        omx = -1, omy = -1;
-      float X = -1, Y = -1, Z = -1;
-      unsigned int old_button = 0, key = 0;
-
-      bool shape_selected = false, text_down = false, visible_cursor = true;
-      static CImg<floatT> pose3d;
-      static bool is_view3d = false, is_axes = true;
-      if (reset_view3d) { pose3d.assign(); is_view3d = false; }
-      CImg<floatT> points3d, opacities3d, sel_opacities3d;
-      CImgList<uintT> primitives3d, sel_primitives3d;
-      CImgList<ucharT> colors3d, sel_colors3d;
-      CImg<ucharT> visu, visu0, view3d;
-      CImg<charT> text(1024); *text = 0;
-
-      while (!key && !disp.is_closed() && !shape_selected) {
-
-        // Handle mouse motion and selection
-        int
-          mx = disp.mouse_x(),
-          my = disp.mouse_y();
-
-        const float
-          mX = mx<0?-1.0f:(float)mx*(width() + (depth()>1?depth():0))/disp.width(),
-          mY = my<0?-1.0f:(float)my*(height() + (depth()>1?depth():0))/disp.height();
-
-        area = 0;
-        if (mX>=0 && mY>=0 && mX<width() && mY<height())  { area = 1; X = mX; Y = mY; Z = (float)(phase?Z1:Z0); }
-        if (mX>=0 && mX<width() && mY>=height()) { area = 2; X = mX; Z = mY - _height; Y = (float)(phase?Y1:Y0); }
-        if (mY>=0 && mX>=width() && mY<height()) { area = 3; Y = mY; Z = mX - _width; X = (float)(phase?X1:X0); }
-        if (mX>=width() && mY>=height()) area = 4;
-        if (disp.button()) { if (!clicked_area) clicked_area = area; } else clicked_area = 0;
-
-        CImg<charT> filename(32);
-
-        switch (key = disp.key()) {
-#if cimg_OS!=2
-        case cimg::keyCTRLRIGHT :
-#endif
-        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
-        case cimg::keyPAGEUP :
-          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { disp.set_wheel(1); key = 0; } break;
-        case cimg::keyPAGEDOWN :
-          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { disp.set_wheel(-1); key = 0; } break;
-        case cimg::keyA : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            is_axes = !is_axes; disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
-                     CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
-              _is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).resize(cimg_fitscreen(_width,_height,_depth),false)._is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyV : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            is_view3d = !is_view3d; disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.bmp",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            if (visu0) {
-              (+visu0).draw_text(0,0," Saving snapshot... ",foreground_color,background_color,0.7f,13).display(disp);
-              visu0.save(filename);
-              (+visu0).draw_text(0,0," Snapshot '%s' saved. ",foreground_color,background_color,0.7f,13,filename._data).
-                display(disp);
-            }
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyO : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-#ifdef cimg_use_zlib
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimgz",snap_number++);
-#else
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimg",snap_number++);
-#endif
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu0).draw_text(0,0," Saving instance... ",foreground_color,background_color,0.7f,13).display(disp);
-            save(filename);
-            (+visu0).draw_text(0,0," Instance '%s' saved. ",foreground_color,background_color,0.7f,13,filename._data).
-              display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-        }
-
-        switch (area) {
-
-        case 0 : // When mouse is out of image range.
-          mx = my = -1; X = Y = Z = -1;
-          break;
-
-        case 1 : case 2 : case 3 : // When mouse is over the XY,XZ or YZ projections.
-          if (disp.button()&1 && phase<2 && clicked_area==area) { // When selection has been started (1st step).
-            if (_depth>1 && (X1!=(int)X || Y1!=(int)Y || Z1!=(int)Z)) visu0.assign();
-            X1 = (int)X; Y1 = (int)Y; Z1 = (int)Z;
-          }
-          if (!(disp.button()&1) && phase>=2 && clicked_area!=area) { // When selection is at 2nd step (for volumes).
-            switch (starting_area) {
-            case 1 : if (Z1!=(int)Z) visu0.assign(); Z1 = (int)Z; break;
-            case 2 : if (Y1!=(int)Y) visu0.assign(); Y1 = (int)Y; break;
-            case 3 : if (X1!=(int)X) visu0.assign(); X1 = (int)X; break;
-            }
-          }
-          if (disp.button()&2 && clicked_area==area) { // When moving through the image/volume.
-            if (phase) {
-              if (_depth>1 && (X1!=(int)X || Y1!=(int)Y || Z1!=(int)Z)) visu0.assign();
-              X1 = (int)X; Y1 = (int)Y; Z1 = (int)Z;
-            } else {
-              if (_depth>1 && (X0!=(int)X || Y0!=(int)Y || Z0!=(int)Z)) visu0.assign();
-              X0 = (int)X; Y0 = (int)Y; Z0 = (int)Z;
-            }
-          }
-          if (disp.button()&4) {
-            X = (float)X0; Y = (float)Y0; Z = (float)Z0; phase = area = clicked_area = starting_area = 0;
-            visu0.assign();
-          }
-          if (disp.wheel()) { // When moving through the slices of the volume (with mouse wheel).
-            if (_depth>1 && !disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT() &&
-                !disp.is_keySHIFTLEFT() && !disp.is_keySHIFTRIGHT() &&
-                !disp.is_keyALT() && !disp.is_keyALTGR()) {
-              switch (area) {
-              case 1 :
-                if (phase) Z = (float)(Z1+=disp.wheel()); else Z = (float)(Z0+=disp.wheel());
-                visu0.assign(); break;
-              case 2 :
-                if (phase) Y = (float)(Y1+=disp.wheel()); else Y = (float)(Y0+=disp.wheel());
-                visu0.assign(); break;
-              case 3 :
-                if (phase) X = (float)(X1+=disp.wheel()); else X = (float)(X0+=disp.wheel());
-                visu0.assign(); break;
-              }
-              disp.set_wheel();
-            } else key = ~0U;
-          }
-          if ((disp.button()&1)!=old_button) { // When left button has just been pressed or released.
-            switch (phase) {
-            case 0 :
-              if (area==clicked_area) {
-                X0 = X1 = (int)X; Y0 = Y1 = (int)Y; Z0 = Z1 = (int)Z; starting_area = area; ++phase;
-              } break;
-            case 1 :
-              if (area==starting_area) {
-                X1 = (int)X; Y1 = (int)Y; Z1 = (int)Z; ++phase;
-              } else if (!(disp.button()&1)) { X = (float)X0; Y = (float)Y0; Z = (float)Z0; phase = 0; visu0.assign(); }
-              break;
-            case 2 : ++phase; break;
-            }
-            old_button = disp.button()&1;
-          }
-          break;
-
-        case 4 : // When mouse is over the 3d view.
-          if (is_view3d && points3d) {
-            X3d = mx - width()*disp.width()/(width() + (depth()>1?depth():0));
-            Y3d = my - height()*disp.height()/(height() + (depth()>1?depth():0));
-            if (oX3d<0) { oX3d = X3d; oY3d = Y3d; }
-            // Left + right buttons: reset.
-            if ((disp.button()&3)==3) { pose3d.assign(); view3d.assign(); oX3d = oY3d = X3d = Y3d = -1; }
-            else if (disp.button()&1 && pose3d && (oX3d!=X3d || oY3d!=Y3d)) { // Left button: rotate.
-              const float
-                R = 0.45f*std::min(view3d._width,view3d._height),
-                R2 = R*R,
-                u0 = (float)(oX3d - view3d.width()/2),
-                v0 = (float)(oY3d - view3d.height()/2),
-                u1 = (float)(X3d - view3d.width()/2),
-                v1 = (float)(Y3d - view3d.height()/2),
-                n0 = cimg::hypot(u0,v0),
-                n1 = cimg::hypot(u1,v1),
-                nu0 = n0>R?(u0*R/n0):u0,
-                nv0 = n0>R?(v0*R/n0):v0,
-                nw0 = (float)std::sqrt(std::max(0.0f,R2 - nu0*nu0 - nv0*nv0)),
-                nu1 = n1>R?(u1*R/n1):u1,
-                nv1 = n1>R?(v1*R/n1):v1,
-                nw1 = (float)std::sqrt(std::max(0.0f,R2 - nu1*nu1 - nv1*nv1)),
-                u = nv0*nw1 - nw0*nv1,
-                v = nw0*nu1 - nu0*nw1,
-                w = nv0*nu1 - nu0*nv1,
-                n = cimg::hypot(u,v,w),
-                alpha = (float)std::asin(n/R2)*180/cimg::PI;
-              pose3d.draw_image(CImg<floatT>::rotation_matrix(u,v,w,-alpha)*pose3d.get_crop(0,0,2,2));
-              view3d.assign();
-            } else if (disp.button()&2 && pose3d && oY3d!=Y3d) {  // Right button: zoom.
-              pose3d(3,2)-=(oY3d - Y3d)*1.5f; view3d.assign();
-            }
-            if (disp.wheel()) { // Wheel: zoom
-              pose3d(3,2)-=disp.wheel()*15; view3d.assign(); disp.set_wheel();
-            }
-            if (disp.button()&4 && pose3d && (oX3d!=X3d || oY3d!=Y3d)) { // Middle button: shift.
-              pose3d(3,0)-=oX3d - X3d; pose3d(3,1)-=oY3d - Y3d; view3d.assign();
-            }
-            oX3d = X3d; oY3d = Y3d;
-          }
-          mx = my = -1; X = Y = Z = -1;
-          break;
-        }
-
-        if (phase) {
-          if (!feature_type) shape_selected = phase?true:false;
-          else {
-            if (_depth>1) shape_selected = (phase==3)?true:false;
-            else shape_selected = (phase==2)?true:false;
-          }
-        }
-
-        if (X0<0) X0 = 0;
-        if (X0>=width()) X0 = width() - 1;
-        if (Y0<0) Y0 = 0;
-        if (Y0>=height()) Y0 = height() - 1;
-        if (Z0<0) Z0 = 0;
-        if (Z0>=depth()) Z0 = depth() - 1;
-        if (X1<1) X1 = 0;
-        if (X1>=width()) X1 = width() - 1;
-        if (Y1<0) Y1 = 0;
-        if (Y1>=height()) Y1 = height() - 1;
-        if (Z1<0) Z1 = 0;
-        if (Z1>=depth()) Z1 = depth() - 1;
-
-        // Draw visualization image on the display
-        if (mx!=omx || my!=omy || !visu0 || (_depth>1 && !view3d)) {
-
-          if (!visu0) { // Create image of projected planes.
-            if (thumb) thumb.__get_select(disp,old_normalization,phase?X1:X0,phase?Y1:Y0,phase?Z1:Z0).move_to(visu0);
-            else __get_select(disp,old_normalization,phase?X1:X0,phase?Y1:Y0,phase?Z1:Z0).move_to(visu0);
-            visu0.resize(disp);
-            view3d.assign();
-            points3d.assign();
-          }
-
-          if (is_view3d && _depth>1 && !view3d) { // Create 3d view for volumetric images.
-            const unsigned int
-              _x3d = (unsigned int)cimg::round((float)_width*visu0._width/(_width + _depth),1,1),
-              _y3d = (unsigned int)cimg::round((float)_height*visu0._height/(_height + _depth),1,1),
-              x3d = _x3d>=visu0._width?visu0._width - 1:_x3d,
-              y3d = _y3d>=visu0._height?visu0._height - 1:_y3d;
-            CImg<ucharT>(1,2,1,1,64,128).resize(visu0._width - x3d,visu0._height - y3d,1,visu0._spectrum,3).
-              move_to(view3d);
-            if (!points3d) {
-              get_projections3d(primitives3d,colors3d,phase?X1:X0,phase?Y1:Y0,phase?Z1:Z0,true).move_to(points3d);
-              points3d.append(CImg<floatT>(8,3,1,1,
-                                           0,_width - 1,_width - 1,0,0,_width - 1,_width - 1,0,
-                                           0,0,_height - 1,_height - 1,0,0,_height - 1,_height - 1,
-                                           0,0,0,0,_depth - 1,_depth - 1,_depth - 1,_depth - 1),'x');
-              CImg<uintT>::vector(12,13).move_to(primitives3d); CImg<uintT>::vector(13,14).move_to(primitives3d);
-              CImg<uintT>::vector(14,15).move_to(primitives3d); CImg<uintT>::vector(15,12).move_to(primitives3d);
-              CImg<uintT>::vector(16,17).move_to(primitives3d); CImg<uintT>::vector(17,18).move_to(primitives3d);
-              CImg<uintT>::vector(18,19).move_to(primitives3d); CImg<uintT>::vector(19,16).move_to(primitives3d);
-              CImg<uintT>::vector(12,16).move_to(primitives3d); CImg<uintT>::vector(13,17).move_to(primitives3d);
-              CImg<uintT>::vector(14,18).move_to(primitives3d); CImg<uintT>::vector(15,19).move_to(primitives3d);
-              colors3d.insert(12,CImg<ucharT>::vector(255,255,255));
-              opacities3d.assign(primitives3d.width(),1,1,1,0.5f);
-              if (!phase) {
-                opacities3d[0] = opacities3d[1] = opacities3d[2] = 0.8f;
-                sel_primitives3d.assign();
-                sel_colors3d.assign();
-                sel_opacities3d.assign();
-              } else {
-                if (feature_type==2) {
-                  points3d.append(CImg<floatT>(8,3,1,1,
-                                               X0,X1,X1,X0,X0,X1,X1,X0,
-                                               Y0,Y0,Y1,Y1,Y0,Y0,Y1,Y1,
-                                               Z0,Z0,Z0,Z0,Z1,Z1,Z1,Z1),'x');
-                  sel_primitives3d.assign();
-                  CImg<uintT>::vector(20,21).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(21,22).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(22,23).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(23,20).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(24,25).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(25,26).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(26,27).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(27,24).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(20,24).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(21,25).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(22,26).move_to(sel_primitives3d);
-                  CImg<uintT>::vector(23,27).move_to(sel_primitives3d);
-                } else {
-                  points3d.append(CImg<floatT>(2,3,1,1,
-                                               X0,X1,
-                                               Y0,Y1,
-                                               Z0,Z1),'x');
-                  sel_primitives3d.assign(CImg<uintT>::vector(20,21));
-                }
-                sel_colors3d.assign(sel_primitives3d._width,CImg<ucharT>::vector(255,255,255));
-                sel_opacities3d.assign(sel_primitives3d._width,1,1,1,0.8f);
-              }
-              points3d.shift_object3d(-0.5f*(_width - 1),-0.5f*(_height - 1),-0.5f*(_depth - 1)).resize_object3d();
-              points3d*=0.75f*std::min(view3d._width,view3d._height);
-            }
-
-            if (!pose3d) CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0).move_to(pose3d);
-            CImg<floatT> zbuffer3d(view3d._width,view3d._height,1,1,0);
-            const CImg<floatT> rotated_points3d = pose3d.get_crop(0,0,2,2)*points3d;
-            if (sel_primitives3d)
-              view3d.draw_object3d(pose3d(3,0) + 0.5f*view3d._width,
-                                   pose3d(3,1) + 0.5f*view3d._height,
-                                   pose3d(3,2),
-                                   rotated_points3d,sel_primitives3d,sel_colors3d,sel_opacities3d,
-                                   2,true,500,0,0,0,0,0,zbuffer3d);
-            view3d.draw_object3d(pose3d(3,0) + 0.5f*view3d._width,
-                                 pose3d(3,1) + 0.5f*view3d._height,
-                                 pose3d(3,2),
-                                 rotated_points3d,primitives3d,colors3d,opacities3d,
-                                 2,true,500,0,0,0,0,0,zbuffer3d);
-            visu0.draw_image(x3d,y3d,view3d);
-          }
-          visu = visu0;
-
-          if (X<0 || Y<0 || Z<0) { if (!visible_cursor) { disp.show_mouse(); visible_cursor = true; }}
-          else {
-            if (is_axes) { if (visible_cursor) { disp.hide_mouse(); visible_cursor = false; }}
-            else { if (!visible_cursor) { disp.show_mouse(); visible_cursor = true; }}
-            const int d = (depth()>1)?depth():0;
-            int
-              _vX = (int)X, _vY = (int)Y, _vZ = (int)Z,
-              w = disp.width(), W = width() + d,
-              h = disp.height(), H = height() + d,
-              _xp = (int)(_vX*(float)w/W), xp = _xp + ((int)(_xp*(float)W/w)!=_vX),
-              _yp = (int)(_vY*(float)h/H), yp = _yp + ((int)(_yp*(float)H/h)!=_vY),
-              _xn = (int)((_vX + 1.0f)*w/W - 1), xn = _xn + ((int)((_xn + 1.0f)*W/w)!=_vX + 1),
-              _yn = (int)((_vY + 1.0f)*h/H - 1), yn = _yn + ((int)((_yn + 1.0f)*H/h)!=_vY + 1),
-              _zxp = (int)((_vZ + width())*(float)w/W), zxp = _zxp + ((int)(_zxp*(float)W/w)!=_vZ + width()),
-              _zyp = (int)((_vZ + height())*(float)h/H), zyp = _zyp + ((int)(_zyp*(float)H/h)!=_vZ + height()),
-              _zxn = (int)((_vZ + width() + 1.0f)*w/W - 1),
-                       zxn = _zxn + ((int)((_zxn + 1.0f)*W/w)!=_vZ + width() + 1),
-              _zyn = (int)((_vZ + height() + 1.0f)*h/H - 1),
-                       zyn = _zyn + ((int)((_zyn + 1.0f)*H/h)!=_vZ + height() + 1),
-              _xM = (int)(width()*(float)w/W - 1), xM = _xM + ((int)((_xM + 1.0f)*W/w)!=width()),
-              _yM = (int)(height()*(float)h/H - 1), yM = _yM + ((int)((_yM + 1.0f)*H/h)!=height()),
-              xc = (xp + xn)/2,
-              yc = (yp + yn)/2,
-              zxc = (zxp + zxn)/2,
-              zyc = (zyp + zyn)/2,
-              xf = (int)(X*w/W),
-              yf = (int)(Y*h/H),
-              zxf = (int)((Z + width())*w/W),
-              zyf = (int)((Z + height())*h/H);
-
-            if (is_axes) { // Draw axes.
-              visu.draw_line(0,yf,visu.width() - 1,yf,foreground_color,0.7f,0xFF00FF00).
-                draw_line(0,yf,visu.width() - 1,yf,background_color,0.7f,0x00FF00FF).
-                draw_line(xf,0,xf,visu.height() - 1,foreground_color,0.7f,0xFF00FF00).
-                draw_line(xf,0,xf,visu.height() - 1,background_color,0.7f,0x00FF00FF);
-              if (_depth>1)
-                visu.draw_line(zxf,0,zxf,yM,foreground_color,0.7f,0xFF00FF00).
-                  draw_line(zxf,0,zxf,yM,background_color,0.7f,0x00FF00FF).
-                  draw_line(0,zyf,xM,zyf,foreground_color,0.7f,0xFF00FF00).
-                  draw_line(0,zyf,xM,zyf,background_color,0.7f,0x00FF00FF);
-            }
-
-            // Draw box cursor.
-            if (xn - xp>=4 && yn - yp>=4) visu.draw_rectangle(xp,yp,xn,yn,foreground_color,0.2f).
-                                        draw_rectangle(xp,yp,xn,yn,foreground_color,1,0xAAAAAAAA).
-                                        draw_rectangle(xp,yp,xn,yn,background_color,1,0x55555555);
-            if (_depth>1) {
-              if (yn - yp>=4 && zxn - zxp>=4) visu.draw_rectangle(zxp,yp,zxn,yn,background_color,0.2f).
-                                            draw_rectangle(zxp,yp,zxn,yn,foreground_color,1,0xAAAAAAAA).
-                                            draw_rectangle(zxp,yp,zxn,yn,background_color,1,0x55555555);
-              if (xn - xp>=4 && zyn - zyp>=4) visu.draw_rectangle(xp,zyp,xn,zyn,background_color,0.2f).
-                                            draw_rectangle(xp,zyp,xn,zyn,foreground_color,1,0xAAAAAAAA).
-                                            draw_rectangle(xp,zyp,xn,zyn,background_color,1,0x55555555);
-            }
-
-            // Draw selection.
-            if (phase) {
-              const int
-                _xp0 = (int)(X0*(float)w/W), xp0 = _xp0 + ((int)(_xp0*(float)W/w)!=X0),
-                _yp0 = (int)(Y0*(float)h/H), yp0 = _yp0 + ((int)(_yp0*(float)H/h)!=Y0),
-                _xn0 = (int)((X0 + 1.0f)*w/W - 1), xn0 = _xn0 + ((int)((_xn0 + 1.0f)*W/w)!=X0 + 1),
-                _yn0 = (int)((Y0 + 1.0f)*h/H - 1), yn0 = _yn0 + ((int)((_yn0 + 1.0f)*H/h)!=Y0 + 1),
-                _zxp0 = (int)((Z0 + width())*(float)w/W), zxp0 = _zxp0 + ((int)(_zxp0*(float)W/w)!=Z0 + width()),
-                _zyp0 = (int)((Z0 + height())*(float)h/H), zyp0 = _zyp0 + ((int)(_zyp0*(float)H/h)!=Z0 + height()),
-                _zxn0 = (int)((Z0 + width() + 1.0f)*w/W - 1),
-                zxn0 = _zxn0 + ((int)((_zxn0 + 1.0f)*W/w)!=Z0 + width() + 1),
-                _zyn0 = (int)((Z0 + height() + 1.0f)*h/H - 1),
-                zyn0 = _zyn0 + ((int)((_zyn0 + 1.0f)*H/h)!=Z0 + height() + 1),
-                xc0 = (xp0 + xn0)/2,
-                yc0 = (yp0 + yn0)/2,
-                zxc0 = (zxp0 + zxn0)/2,
-                zyc0 = (zyp0 + zyn0)/2;
-
-              switch (feature_type) {
-              case 1 : {
-                visu.draw_arrow(xc0,yc0,xc,yc,background_color,0.9f,30,5,0x55555555).
-                  draw_arrow(xc0,yc0,xc,yc,foreground_color,0.9f,30,5,0xAAAAAAAA);
-                if (d) {
-                  visu.draw_arrow(zxc0,yc0,zxc,yc,background_color,0.9f,30,5,0x55555555).
-                    draw_arrow(zxc0,yc0,zxc,yc,foreground_color,0.9f,30,5,0xAAAAAAAA).
-                    draw_arrow(xc0,zyc0,xc,zyc,background_color,0.9f,30,5,0x55555555).
-                    draw_arrow(xc0,zyc0,xc,zyc,foreground_color,0.9f,30,5,0xAAAAAAAA);
-                }
-              } break;
-              case 2 : {
-                visu.draw_rectangle(X0<X1?xp0:xp,Y0<Y1?yp0:yp,X0<X1?xn:xn0,Y0<Y1?yn:yn0,background_color,0.2f).
-                  draw_rectangle(X0<X1?xp0:xp,Y0<Y1?yp0:yp,X0<X1?xn:xn0,Y0<Y1?yn:yn0,foreground_color,0.9f,0xAAAAAAAA).
-                  draw_rectangle(X0<X1?xp0:xp,Y0<Y1?yp0:yp,X0<X1?xn:xn0,Y0<Y1?yn:yn0,background_color,0.9f,0x55555555);
-                if (d) {
-                  visu.draw_rectangle(Z0<Z1?zxp0:zxp,Y0<Y1?yp0:yp,Z0<Z1?zxn:zxn0,Y0<Y1?yn:yn0,background_color,0.2f).
-                    draw_rectangle(Z0<Z1?zxp0:zxp,Y0<Y1?yp0:yp,Z0<Z1?zxn:zxn0,Y0<Y1?yn:yn0,
-                                   foreground_color,0.9f,0xAAAAAAAA).
-                    draw_rectangle(Z0<Z1?zxp0:zxp,Y0<Y1?yp0:yp,Z0<Z1?zxn:zxn0,Y0<Y1?yn:yn0,
-                                   background_color,0.9f,0x55555555).
-                    draw_rectangle(X0<X1?xp0:xp,Z0<Z1?zyp0:zyp,X0<X1?xn:xn0,Z0<Z1?zyn:zyn0,
-                                   background_color,0.2f).
-                    draw_rectangle(X0<X1?xp0:xp,Z0<Z1?zyp0:zyp,X0<X1?xn:xn0,Z0<Z1?zyn:zyn0,
-                                   foreground_color,0.9f,0xAAAAAAAA).
-                    draw_rectangle(X0<X1?xp0:xp,Z0<Z1?zyp0:zyp,X0<X1?xn:xn0,Z0<Z1?zyn:zyn0,
-                                   background_color,0.9f,0x55555555);
-                }
-              } break;
-              case 3 : {
-                visu.draw_ellipse(xc0,yc0,
-                                  (float)cimg::abs(xc - xc0),
-                                  (float)cimg::abs(yc - yc0),0,background_color,0.2f).
-                  draw_ellipse(xc0,yc0,
-                               (float)cimg::abs(xc - xc0),
-                               (float)cimg::abs(yc - yc0),0,foreground_color,0.9f,~0U).
-                  draw_point(xc0,yc0,foreground_color,0.9f);
-                if (d) {
-                  visu.draw_ellipse(zxc0,yc0,(float)cimg::abs(zxc - zxc0),(float)cimg::abs(yc - yc0),0,
-                                    background_color,0.2f).
-                    draw_ellipse(zxc0,yc0,(float)cimg::abs(zxc - zxc0),(float)cimg::abs(yc - yc0),0,
-                                 foreground_color,0.9f,~0U).
-                    draw_point(zxc0,yc0,foreground_color,0.9f).
-                    draw_ellipse(xc0,zyc0,(float)cimg::abs(xc - xc0),(float)cimg::abs(zyc - zyc0),0,
-                                 background_color,0.2f).
-                    draw_ellipse(xc0,zyc0,(float)cimg::abs(xc - xc0),(float)cimg::abs(zyc - zyc0),0,
-                                 foreground_color,0.9f,~0U).
-                    draw_point(xc0,zyc0,foreground_color,0.9f);
-                }
-              } break;
-              }
-            }
-
-            // Draw text info.
-            if (my>=0 && my<13) text_down = true; else if (my>=visu.height() - 13) text_down = false;
-            if (!feature_type || !phase) {
-              if (X>=0 && Y>=0 && Z>=0 && X<width() && Y<height() && Z<depth()) {
-                if (_depth>1 || force_display_z_coord)
-                  cimg_snprintf(text,text._width," Point (%d,%d,%d) = [ ",origX + (int)X,origY + (int)Y,origZ + (int)Z);
-                else cimg_snprintf(text,text._width," Point (%d,%d) = [ ",origX + (int)X,origY + (int)Y);
-                char *ctext = text._data + std::strlen(text), *const ltext = text._data + 512;
-                for (unsigned int c = 0; c<_spectrum && ctext<ltext; ++c) {
-                  cimg_snprintf(ctext,text._width/2,cimg::type<T>::format_s(),
-                                cimg::type<T>::format((*this)((int)X,(int)Y,(int)Z,c)));
-                  ctext = text._data + std::strlen(text);
-                  *(ctext++) = ' '; *ctext = 0;
-                }
-                std::strcpy(text._data + std::strlen(text),"] ");
-              }
-            } else switch (feature_type) {
-              case 1 : {
-                const double dX = (double)(X0 - X1), dY = (double)(Y0 - Y1), dZ = (double)(Z0 - Z1),
-                  norm = cimg::hypot(dX,dY,dZ);
-                if (_depth>1 || force_display_z_coord)
-                  cimg_snprintf(text,text._width," Vect (%d,%d,%d)-(%d,%d,%d), Norm = %g ",
-                                origX + X0,origY + Y0,origZ + Z0,origX + X1,origY + Y1,origZ + Z1,norm);
-                else cimg_snprintf(text,text._width," Vect (%d,%d)-(%d,%d), Norm = %g ",
-                                   origX + X0,origY + Y0,origX + X1,origY + Y1,norm);
-              } break;
-              case 2 :
-                if (_depth>1 || force_display_z_coord)
-                  cimg_snprintf(text,text._width," Box (%d,%d,%d)-(%d,%d,%d), Size = (%d,%d,%d) ",
-                                origX + (X0<X1?X0:X1),origY + (Y0<Y1?Y0:Y1),origZ + (Z0<Z1?Z0:Z1),
-                                origX + (X0<X1?X1:X0),origY + (Y0<Y1?Y1:Y0),origZ + (Z0<Z1?Z1:Z0),
-                                1 + cimg::abs(X0 - X1),1 + cimg::abs(Y0 - Y1),1 + cimg::abs(Z0 - Z1));
-                else cimg_snprintf(text,text._width," Box (%d,%d)-(%d,%d), Size = (%d,%d) ",
-                                   origX + (X0<X1?X0:X1),origY + (Y0<Y1?Y0:Y1),
-                                   origX + (X0<X1?X1:X0),origY + (Y0<Y1?Y1:Y0),
-                                   1 + cimg::abs(X0 - X1),1 + cimg::abs(Y0 - Y1));
-                break;
-              default :
-                if (_depth>1 || force_display_z_coord)
-                  cimg_snprintf(text,text._width," Ellipse (%d,%d,%d)-(%d,%d,%d), Radii = (%d,%d,%d) ",
-                                origX + X0,origY + Y0,origZ + Z0,origX + X1,origY + Y1,origZ + Z1,
-                                1 + cimg::abs(X0 - X1),1 + cimg::abs(Y0 - Y1),1 + cimg::abs(Z0 - Z1));
-                else cimg_snprintf(text,text._width," Ellipse (%d,%d)-(%d,%d), Radii = (%d,%d) ",
-                                   origX + X0,origY + Y0,origX + X1,origY + Y1,
-                                   1 + cimg::abs(X0 - X1),1 + cimg::abs(Y0 - Y1));
-              }
-            if (phase || (mx>=0 && my>=0))
-              visu.draw_text(0,text_down?visu.height() - 13:0,text,foreground_color,background_color,0.7f,13);
-          }
-
-          disp.display(visu).wait();
-        } else if (!shape_selected) disp.wait();
-        if (disp.is_resized()) { disp.resize(false)._is_resized = false; old_is_resized = true; visu0.assign(); }
-        omx = mx; omy = my;
-        if (!exit_on_anykey && key && key!=cimg::keyESC &&
-            (key!=cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          key = 0;
-        }
-      }
-
-      // Return result.
-      CImg<intT> res(1,feature_type==0?3:6,1,1,-1);
-      if (XYZ) { XYZ[0] = (unsigned int)X0; XYZ[1] = (unsigned int)Y0; XYZ[2] = (unsigned int)Z0; }
-      if (shape_selected) {
-        if (feature_type==2) {
-          if (X0>X1) cimg::swap(X0,X1);
-          if (Y0>Y1) cimg::swap(Y0,Y1);
-          if (Z0>Z1) cimg::swap(Z0,Z1);
-        }
-        if (X1<0 || Y1<0 || Z1<0) X0 = Y0 = Z0 = X1 = Y1 = Z1 = -1;
-        switch (feature_type) {
-        case 1 : case 2 : res[0] = X0; res[1] = Y0; res[2] = Z0; res[3] = X1; res[4] = Y1; res[5] = Z1; break;
-        case 3 :
-          res[3] = cimg::abs(X1 - X0); res[4] = cimg::abs(Y1 - Y0); res[5] = cimg::abs(Z1 - Z0); // keep no break here!
-        default : res[0] = X0; res[1] = Y0; res[2] = Z0;
-        }
-      }
-      if (!exit_on_anykey || !(disp.button()&4)) disp.set_button();
-      if (!visible_cursor) disp.show_mouse();
-      disp._normalization = old_normalization;
-      disp._is_resized = old_is_resized;
-      if (key!=~0U) disp.set_key(key);
-      return res;
-    }
-
-    // Return a visualizable uchar8 image for display routines.
-    CImg<ucharT> __get_select(const CImgDisplay& disp, const int normalization,
-                              const int x, const int y, const int z) const {
-      if (is_empty()) return CImg<ucharT>(1,1,1,1,0);
-      const CImg<T> crop = get_shared_channels(0,std::min(2,spectrum() - 1));
-      CImg<Tuchar> img2d;
-      if (_depth>1) {
-        const int mdisp = std::min(disp.screen_width(),disp.screen_height());
-        if (depth()>mdisp) {
-          crop.get_resize(-100,-100,mdisp,-100,0).move_to(img2d);
-          img2d.projections2d(x,y,z*img2d._depth/_depth);
-        } else crop.get_projections2d(x,y,z).move_to(img2d);
-      } else CImg<Tuchar>(crop,false).move_to(img2d);
-
-      // Check for inf and NaN values.
-      if (cimg::type<T>::is_float() && normalization) {
-        bool is_inf = false, is_nan = false;
-        cimg_for(img2d,ptr,Tuchar)
-          if (cimg::type<T>::is_inf(*ptr)) { is_inf = true; break; }
-          else if (cimg::type<T>::is_nan(*ptr)) { is_nan = true; break; }
-        if (is_inf || is_nan) {
-          Tint m0 = (Tint)cimg::type<T>::max(), M0 = (Tint)cimg::type<T>::min();
-          if (!normalization) { m0 = 0; M0 = 255; }
-          else if (normalization==2) { m0 = (Tint)disp._min; M0 = (Tint)disp._max; }
-          else
-            cimg_for(img2d,ptr,Tuchar)
-              if (!cimg::type<T>::is_inf(*ptr) && !cimg::type<T>::is_nan(*ptr)) {
-                if (*ptr<(Tuchar)m0) m0 = *ptr;
-                if (*ptr>(Tuchar)M0) M0 = *ptr;
-              }
-          const T
-            val_minf = (T)(normalization==1 || normalization==3?m0 - (M0 - m0)*20 - 1:m0),
-            val_pinf = (T)(normalization==1 || normalization==3?M0 + (M0 - m0)*20 + 1:M0);
-          if (is_nan)
-            cimg_for(img2d,ptr,Tuchar)
-              if (cimg::type<T>::is_nan(*ptr)) *ptr = val_minf; // Replace NaN values.
-          if (is_inf)
-            cimg_for(img2d,ptr,Tuchar)
-              if (cimg::type<T>::is_inf(*ptr)) *ptr = (float)*ptr<0?val_minf:val_pinf; // Replace +-inf values.
-        }
-      }
-
-      switch (normalization) {
-      case 1 : img2d.normalize((T)0,(T)255); break;
-      case 2 : {
-        const float m = disp._min, M = disp._max;
-        (img2d-=m)*=255.0f/(M - m>0?M - m:1);
-      } break;
-      case 3 :
-        if (cimg::type<T>::is_float()) img2d.normalize((T)0,(T)255);
-        else {
-          const float m = (float)cimg::type<T>::min(), M = (float)cimg::type<T>::max();
-          (img2d-=m)*=255.0f/(M - m>0?M - m:1);
-        } break;
-      }
-
-      if (img2d.spectrum()==2) img2d.channels(0,2);
-      return img2d;
-    }
-
-    //! Select sub-graph in a graph.
-    CImg<intT> get_select_graph(CImgDisplay &disp,
-                                const unsigned int plot_type=1, const unsigned int vertex_type=1,
-                                const char *const labelx=0, const double xmin=0, const double xmax=0,
-                                const char *const labely=0, const double ymin=0, const double ymax=0,
-                                const bool exit_on_anykey=false) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "select_graph(): Empty instance.",
-                                    cimg_instance);
-      if (!disp) disp.assign(cimg_fitscreen(CImgDisplay::screen_width()/2,CImgDisplay::screen_height()/2,1),0,0).
-                   set_title("CImg<%s>",pixel_type());
-      const ulongT siz = (ulongT)_width*_height*_depth;
-      const unsigned int old_normalization = disp.normalization();
-      disp.show().set_button().set_wheel()._normalization = 0;
-
-      double nymin = ymin, nymax = ymax, nxmin = xmin, nxmax = xmax;
-      if (nymin==nymax) { nymin = (Tfloat)min_max(nymax); const double dy = nymax - nymin; nymin-=dy/20; nymax+=dy/20; }
-      if (nymin==nymax) { --nymin; ++nymax; }
-      if (nxmin==nxmax && nxmin==0) { nxmin = 0; nxmax = siz - 1.0; }
-
-      static const unsigned char black[] = { 0, 0, 0 }, white[] = { 255, 255, 255 }, gray[] = { 220, 220, 220 };
-      static const unsigned char gray2[] = { 110, 110, 110 }, ngray[] = { 35, 35, 35 };
-      static unsigned int odimv = 0;
-      static CImg<ucharT> colormap;
-      if (odimv!=_spectrum) {
-        odimv = _spectrum;
-        colormap = CImg<ucharT>(3,_spectrum,1,1,120).noise(70,1);
-        if (_spectrum==1) { colormap[0] = colormap[1] = 120; colormap[2] = 200; }
-        else {
-          colormap(0,0) = 220; colormap(1,0) = 10; colormap(2,0) = 10;
-          if (_spectrum>1) { colormap(0,1) = 10; colormap(1,1) = 220; colormap(2,1) = 10; }
-          if (_spectrum>2) { colormap(0,2) = 10; colormap(1,2) = 10; colormap(2,2) = 220; }
-        }
-      }
-
-      CImg<ucharT> visu0, visu, graph, text, axes;
-      int x0 = -1, x1 = -1, y0 = -1, y1 = -1, omouse_x = -2, omouse_y = -2;
-      const unsigned int one = plot_type==3?0U:1U;
-      unsigned int okey = 0, obutton = 0;
-      CImg<charT> message(1024);
-      CImg_3x3(I,unsigned char);
-
-      for (bool selected = false; !selected && !disp.is_closed() && !okey && !disp.wheel(); ) {
-        const int mouse_x = disp.mouse_x(), mouse_y = disp.mouse_y();
-        const unsigned int key = disp.key(), button = disp.button();
-
-        // Generate graph representation.
-        if (!visu0) {
-          visu0.assign(disp.width(),disp.height(),1,3,220);
-          const int gdimx = disp.width() - 32, gdimy = disp.height() - 32;
-          if (gdimx>0 && gdimy>0) {
-            graph.assign(gdimx,gdimy,1,3,255);
-            if (siz<32) {
-              if (siz>1) graph.draw_grid(gdimx/(float)(siz - one),gdimy/(float)(siz - one),0,0,
-                                         false,true,black,0.2f,0x33333333,0x33333333);
-            } else graph.draw_grid(-10,-10,0,0,false,true,black,0.2f,0x33333333,0x33333333);
-            cimg_forC(*this,c)
-              graph.draw_graph(get_shared_channel(c),&colormap(0,c),(plot_type!=3 || _spectrum==1)?1:0.6f,
-                               plot_type,vertex_type,nymax,nymin);
-
-            axes.assign(gdimx,gdimy,1,1,0);
-            const float
-              dx = (float)cimg::abs(nxmax - nxmin), dy = (float)cimg::abs(nymax - nymin),
-              px = (float)std::pow(10.0,(int)std::log10(dx?dx:1) - 2.0),
-              py = (float)std::pow(10.0,(int)std::log10(dy?dy:1) - 2.0);
-            const CImg<Tdouble>
-              seqx = dx<=0?CImg<Tdouble>::vector(nxmin):
-                CImg<Tdouble>::sequence(1 + gdimx/60,nxmin,one?nxmax:nxmin + (nxmax - nxmin)*(siz + 1)/siz).round(px),
-              seqy = CImg<Tdouble>::sequence(1 + gdimy/60,nymax,nymin).round(py);
-
-            const bool allow_zero = (nxmin*nxmax>0) || (nymin*nymax>0);
-            axes.draw_axes(seqx,seqy,white,1,~0U,~0U,13,allow_zero);
-            if (nymin>0) axes.draw_axis(seqx,gdimy - 1,gray,1,~0U,13,allow_zero);
-            if (nymax<0) axes.draw_axis(seqx,0,gray,1,~0U,13,allow_zero);
-            if (nxmin>0) axes.draw_axis(0,seqy,gray,1,~0U,13,allow_zero);
-            if (nxmax<0) axes.draw_axis(gdimx - 1,seqy,gray,1,~0U,13,allow_zero);
-
-            cimg_for3x3(axes,x,y,0,0,I,unsigned char)
-              if (Icc) {
-                if (Icc==255) cimg_forC(graph,c) graph(x,y,c) = 0;
-                else cimg_forC(graph,c) graph(x,y,c) = (unsigned char)(2*graph(x,y,c)/3);
-              }
-              else if (Ipc || Inc || Icp || Icn || Ipp || Inn || Ipn || Inp)
-                cimg_forC(graph,c) graph(x,y,c) = (unsigned char)((graph(x,y,c) + 511)/3);
-
-            visu0.draw_image(16,16,graph);
-            visu0.draw_line(15,15,16 + gdimx,15,gray2).draw_line(16 + gdimx,15,16 + gdimx,16 + gdimy,gray2).
-              draw_line(16 + gdimx,16 + gdimy,15,16 + gdimy,white).draw_line(15,16 + gdimy,15,15,white);
-          } else graph.assign();
-          text.assign().draw_text(0,0,labelx?labelx:"X-axis",white,ngray,1,13).resize(-100,-100,1,3);
-          visu0.draw_image((visu0.width() - text.width())/2,visu0.height() - 14,~text);
-          text.assign().draw_text(0,0,labely?labely:"Y-axis",white,ngray,1,13).rotate(-90).resize(-100,-100,1,3);
-          visu0.draw_image(1,(visu0.height() - text.height())/2,~text);
-          visu.assign();
-        }
-
-        // Generate and display current view.
-        if (!visu) {
-          visu.assign(visu0);
-          if (graph && x0>=0 && x1>=0) {
-            const int
-              nx0 = x0<=x1?x0:x1,
-              nx1 = x0<=x1?x1:x0,
-              ny0 = y0<=y1?y0:y1,
-              ny1 = y0<=y1?y1:y0,
-              sx0 = (int)(16 + nx0*(visu.width() - 32)/std::max((ulongT)1,siz - one)),
-              sx1 = (int)(15 + (nx1 + 1)*(visu.width() - 32)/std::max((ulongT)1,siz - one)),
-              sy0 = 16 + ny0,
-              sy1 = 16 + ny1;
-            if (y0>=0 && y1>=0)
-              visu.draw_rectangle(sx0,sy0,sx1,sy1,gray,0.5f).draw_rectangle(sx0,sy0,sx1,sy1,black,0.5f,0xCCCCCCCCU);
-            else visu.draw_rectangle(sx0,0,sx1,visu.height() - 17,gray,0.5f).
-                   draw_line(sx0,16,sx0,visu.height() - 17,black,0.5f,0xCCCCCCCCU).
-                   draw_line(sx1,16,sx1,visu.height() - 17,black,0.5f,0xCCCCCCCCU);
-          }
-          if (mouse_x>=16 && mouse_y>=16 && mouse_x<visu.width() - 16 && mouse_y<visu.height() - 16) {
-            if (graph) visu.draw_line(mouse_x,16,mouse_x,visu.height() - 17,black,0.5f,0x55555555U);
-            const unsigned int
-              x = (unsigned int)cimg::round((mouse_x - 16.0f)*(siz - one)/(disp.width() - 32),1,one?0:-1);
-            const double cx = nxmin + x*(nxmax - nxmin)/std::max((ulongT)1,siz - 1);
-            if (_spectrum>=7)
-              cimg_snprintf(message,message._width,"Value[%u:%g] = ( %g %g %g ... %g %g %g )",x,cx,
-                            (double)(*this)(x,0,0,0),(double)(*this)(x,0,0,1),(double)(*this)(x,0,0,2),
-                            (double)(*this)(x,0,0,_spectrum - 4),(double)(*this)(x,0,0,_spectrum - 3),
-                            (double)(*this)(x,0,0,_spectrum - 1));
-            else {
-              cimg_snprintf(message,message._width,"Value[%u:%g] = ( ",x,cx);
-              cimg_forC(*this,c) cimg_sprintf(message._data + std::strlen(message),"%g ",(double)(*this)(x,0,0,c));
-              cimg_sprintf(message._data + std::strlen(message),")");
-            }
-            if (x0>=0 && x1>=0) {
-              const unsigned int
-                nx0 = (unsigned int)(x0<=x1?x0:x1),
-                nx1 = (unsigned int)(x0<=x1?x1:x0),
-                ny0 = (unsigned int)(y0<=y1?y0:y1),
-                ny1 = (unsigned int)(y0<=y1?y1:y0);
-              const double
-                cx0 = nxmin + nx0*(nxmax - nxmin)/std::max((ulongT)1,siz - 1),
-                cx1 = nxmin + (nx1 + one)*(nxmax - nxmin)/std::max((ulongT)1,siz - 1),
-                cy0 = nymax - ny0*(nymax - nymin)/(visu._height - 32),
-                cy1 = nymax - ny1*(nymax - nymin)/(visu._height - 32);
-              if (y0>=0 && y1>=0)
-                cimg_sprintf(message._data + std::strlen(message)," - Range ( %u:%g, %g ) - ( %u:%g, %g )",
-                             x0,cx0,cy0,x1 + one,cx1,cy1);
-              else
-                cimg_sprintf(message._data + std::strlen(message)," - Range [ %u:%g - %u:%g ]",
-                             x0,cx0,x1 + one,cx1);
-            }
-            text.assign().draw_text(0,0,message,white,ngray,1,13).resize(-100,-100,1,3);
-            visu.draw_image((visu.width() - text.width())/2,1,~text);
-          }
-          visu.display(disp);
-        }
-
-        // Test keys.
-        CImg<charT> filename(32);
-        switch (okey = key) {
-#if cimg_OS!=2
-        case cimg::keyCTRLRIGHT : case cimg::keySHIFTRIGHT :
-#endif
-        case cimg::keyCTRLLEFT : case cimg::keySHIFTLEFT : okey = 0; break;
-        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-          disp.set_fullscreen(false).
-            resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
-                   CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
-            _is_resized = true;
-          disp.set_key(key,false); okey = 0;
-        } break;
-        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-          disp.set_fullscreen(false).
-            resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
-          disp.set_key(key,false); okey = 0;
-        } break;
-        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(cimg_fitscreen(CImgDisplay::screen_width()/2,
-                                    CImgDisplay::screen_height()/2,1),false)._is_resized = true;
-            disp.set_key(key,false); okey = 0;
-          } break;
-        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
-            disp.set_key(key,false); okey = 0;
-          } break;
-        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            if (visu || visu0) {
-              CImg<ucharT> &screen = visu?visu:visu0;
-              std::FILE *file;
-              do {
-                cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.bmp",snap_number++);
-                if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-              } while (file);
-              (+screen).draw_text(0,0," Saving snapshot... ",black,gray,1,13).display(disp);
-              screen.save(filename);
-              (+screen).draw_text(0,0," Snapshot '%s' saved. ",black,gray,1,13,filename._data).display(disp);
-            }
-            disp.set_key(key,false); okey = 0;
-          } break;
-        case cimg::keyO : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            if (visu || visu0) {
-              CImg<ucharT> &screen = visu?visu:visu0;
-              std::FILE *file;
-              do {
-#ifdef cimg_use_zlib
-                cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimgz",snap_number++);
-#else
-                cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimg",snap_number++);
-#endif
-                if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-              } while (file);
-              (+screen).draw_text(0,0," Saving instance... ",black,gray,1,13).display(disp);
-              save(filename);
-              (+screen).draw_text(0,0," Instance '%s' saved. ",black,gray,1,13,filename._data).display(disp);
-            }
-            disp.set_key(key,false); okey = 0;
-          } break;
-        }
-
-        // Handle mouse motion and mouse buttons
-        if (obutton!=button || omouse_x!=mouse_x || omouse_y!=mouse_y) {
-          visu.assign();
-          if (disp.mouse_x()>=0 && disp.mouse_y()>=0) {
-            const int
-              mx = (mouse_x - 16)*(int)(siz - one)/(disp.width() - 32),
-              cx = cimg::cut(mx,0,(int)(siz - 1 - one)),
-              my = mouse_y - 16,
-              cy = cimg::cut(my,0,disp.height() - 32);
-            if (button&1) {
-              if (!obutton) { x0 = cx; y0 = -1; } else { x1 = cx; y1 = -1; }
-            }
-            else if (button&2) {
-              if (!obutton) { x0 = cx; y0 = cy; } else { x1 = cx; y1 = cy; }
-            }
-            else if (obutton) { x1 = x1>=0?cx:-1; y1 = y1>=0?cy:-1; selected = true; }
-          } else if (!button && obutton) selected = true;
-          obutton = button; omouse_x = mouse_x; omouse_y = mouse_y;
-        }
-        if (disp.is_resized()) { disp.resize(false); visu0.assign(); }
-        if (visu && visu0) disp.wait();
-        if (!exit_on_anykey && okey && okey!=cimg::keyESC &&
-            (okey!=cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          disp.set_key(key,false);
-          okey = 0;
-        }
-      }
-
-      disp._normalization = old_normalization;
-      if (x1>=0 && x1<x0) cimg::swap(x0,x1);
-      if (y1<y0) cimg::swap(y0,y1);
-      disp.set_key(okey);
-      return CImg<intT>(4,1,1,1,x0,y0,x1>=0?x1 + (int)one:-1,y1);
-    }
-
-    //! Load image from a file.
-    /**
-       \param filename Filename, as a C-string.
-       \note The extension of \c filename defines the file format. If no filename
-       extension is provided, CImg<T>::get_load() will try to load the file as a .cimg or .cimgz file.
-    **/
-    CImg<T>& load(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load(): Specified filename is (null).",
-                                    cimg_instance);
-
-      if (!cimg::strncasecmp(filename,"http://",7) || !cimg::strncasecmp(filename,"https://",8)) {
-        CImg<charT> filename_local(256);
-        load(cimg::load_network(filename,filename_local));
-        std::remove(filename_local);
-        return *this;
-      }
-
-      const char *const ext = cimg::split_filename(filename);
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      bool is_loaded = true;
-      try {
-#ifdef cimg_load_plugin
-        cimg_load_plugin(filename);
-#endif
-#ifdef cimg_load_plugin1
-        cimg_load_plugin1(filename);
-#endif
-#ifdef cimg_load_plugin2
-        cimg_load_plugin2(filename);
-#endif
-#ifdef cimg_load_plugin3
-        cimg_load_plugin3(filename);
-#endif
-#ifdef cimg_load_plugin4
-        cimg_load_plugin4(filename);
-#endif
-#ifdef cimg_load_plugin5
-        cimg_load_plugin5(filename);
-#endif
-#ifdef cimg_load_plugin6
-        cimg_load_plugin6(filename);
-#endif
-#ifdef cimg_load_plugin7
-        cimg_load_plugin7(filename);
-#endif
-#ifdef cimg_load_plugin8
-        cimg_load_plugin8(filename);
-#endif
-        // Ascii formats
-        if (!cimg::strcasecmp(ext,"asc")) load_ascii(filename);
-        else if (!cimg::strcasecmp(ext,"dlm") ||
-                 !cimg::strcasecmp(ext,"txt")) load_dlm(filename);
-
-        // 2d binary formats
-        else if (!cimg::strcasecmp(ext,"bmp")) load_bmp(filename);
-        else if (!cimg::strcasecmp(ext,"jpg") ||
-                 !cimg::strcasecmp(ext,"jpeg") ||
-                 !cimg::strcasecmp(ext,"jpe") ||
-                 !cimg::strcasecmp(ext,"jfif") ||
-                 !cimg::strcasecmp(ext,"jif")) load_jpeg(filename);
-        else if (!cimg::strcasecmp(ext,"png")) load_png(filename);
-        else if (!cimg::strcasecmp(ext,"ppm") ||
-                 !cimg::strcasecmp(ext,"pgm") ||
-                 !cimg::strcasecmp(ext,"pnm") ||
-                 !cimg::strcasecmp(ext,"pbm") ||
-                 !cimg::strcasecmp(ext,"pnk")) load_pnm(filename);
-        else if (!cimg::strcasecmp(ext,"pfm")) load_pfm(filename);
-        else if (!cimg::strcasecmp(ext,"tif") ||
-                 !cimg::strcasecmp(ext,"tiff")) load_tiff(filename);
-        else if (!cimg::strcasecmp(ext,"exr")) load_exr(filename);
-        else if (!cimg::strcasecmp(ext,"cr2") ||
-                 !cimg::strcasecmp(ext,"crw") ||
-                 !cimg::strcasecmp(ext,"dcr") ||
-                 !cimg::strcasecmp(ext,"mrw") ||
-                 !cimg::strcasecmp(ext,"nef") ||
-                 !cimg::strcasecmp(ext,"orf") ||
-                 !cimg::strcasecmp(ext,"pix") ||
-                 !cimg::strcasecmp(ext,"ptx") ||
-                 !cimg::strcasecmp(ext,"raf") ||
-                 !cimg::strcasecmp(ext,"srf")) load_dcraw_external(filename);
-        else if (!cimg::strcasecmp(ext,"gif")) load_gif_external(filename);
-
-        // 3d binary formats
-        else if (!cimg::strcasecmp(ext,"dcm") ||
-                 !cimg::strcasecmp(ext,"dicom")) load_medcon_external(filename);
-        else if (!cimg::strcasecmp(ext,"hdr") ||
-                 !cimg::strcasecmp(ext,"nii")) load_analyze(filename);
-        else if (!cimg::strcasecmp(ext,"par") ||
-                 !cimg::strcasecmp(ext,"rec")) load_parrec(filename);
-        else if (!cimg::strcasecmp(ext,"mnc")) load_minc2(filename);
-        else if (!cimg::strcasecmp(ext,"inr")) load_inr(filename);
-        else if (!cimg::strcasecmp(ext,"pan")) load_pandore(filename);
-        else if (!cimg::strcasecmp(ext,"cimg") ||
-                 !cimg::strcasecmp(ext,"cimgz") ||
-                 !*ext)  return load_cimg(filename);
-
-        // Archive files
-        else if (!cimg::strcasecmp(ext,"gz")) load_gzip_external(filename);
-
-        // Image sequences
-        else if (!cimg::strcasecmp(ext,"avi") ||
-                 !cimg::strcasecmp(ext,"mov") ||
-                 !cimg::strcasecmp(ext,"asf") ||
-                 !cimg::strcasecmp(ext,"divx") ||
-                 !cimg::strcasecmp(ext,"flv") ||
-                 !cimg::strcasecmp(ext,"mpg") ||
-                 !cimg::strcasecmp(ext,"m1v") ||
-                 !cimg::strcasecmp(ext,"m2v") ||
-                 !cimg::strcasecmp(ext,"m4v") ||
-                 !cimg::strcasecmp(ext,"mjp") ||
-                 !cimg::strcasecmp(ext,"mp4") ||
-                 !cimg::strcasecmp(ext,"mkv") ||
-                 !cimg::strcasecmp(ext,"mpe") ||
-                 !cimg::strcasecmp(ext,"movie") ||
-                 !cimg::strcasecmp(ext,"ogm") ||
-                 !cimg::strcasecmp(ext,"ogg") ||
-                 !cimg::strcasecmp(ext,"ogv") ||
-                 !cimg::strcasecmp(ext,"qt") ||
-                 !cimg::strcasecmp(ext,"rm") ||
-                 !cimg::strcasecmp(ext,"vob") ||
-                 !cimg::strcasecmp(ext,"wmv") ||
-                 !cimg::strcasecmp(ext,"xvid") ||
-                 !cimg::strcasecmp(ext,"mpeg")) load_video(filename);
-        else is_loaded = false;
-      } catch (CImgIOException&) { is_loaded = false; }
-
-      // If nothing loaded, try to guess file format from magic number in file.
-      if (!is_loaded) {
-        std::FILE *file = std_fopen(filename,"rb");
-        if (!file) {
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimg_instance
-                                "load(): Failed to open file '%s'.",
-                                cimg_instance,
-                                filename);
-        }
-
-        const char *const f_type = cimg::ftype(file,filename);
-        std::fclose(file);
-        is_loaded = true;
-        try {
-          if (!cimg::strcasecmp(f_type,"pnm")) load_pnm(filename);
-          else if (!cimg::strcasecmp(f_type,"pfm")) load_pfm(filename);
-          else if (!cimg::strcasecmp(f_type,"bmp")) load_bmp(filename);
-          else if (!cimg::strcasecmp(f_type,"inr")) load_inr(filename);
-          else if (!cimg::strcasecmp(f_type,"jpg")) load_jpeg(filename);
-          else if (!cimg::strcasecmp(f_type,"pan")) load_pandore(filename);
-          else if (!cimg::strcasecmp(f_type,"png")) load_png(filename);
-          else if (!cimg::strcasecmp(f_type,"tif")) load_tiff(filename);
-          else if (!cimg::strcasecmp(f_type,"gif")) load_gif_external(filename);
-          else if (!cimg::strcasecmp(f_type,"dcm")) load_medcon_external(filename);
-          else is_loaded = false;
-        } catch (CImgIOException&) { is_loaded = false; }
-      }
-
-      // If nothing loaded, try to load file with other means.
-      if (!is_loaded) {
-        try {
-          load_other(filename);
-        } catch (CImgIOException&) {
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimg_instance
-                                "load(): Failed to recognize format of file '%s'.",
-                                cimg_instance,
-                                filename);
-        }
-      }
-      cimg::exception_mode(omode);
-      return *this;
-    }
-
-    //! Load image from a file \newinstance.
-    static CImg<T> get_load(const char *const filename) {
-      return CImg<T>().load(filename);
-    }
-
-    //! Load image from an ascii file.
-    /**
-       \param filename Filename, as a C -string.
-    **/
-    CImg<T>& load_ascii(const char *const filename) {
-      return _load_ascii(0,filename);
-    }
-
-    //! Load image from an ascii file \inplace.
-    static CImg<T> get_load_ascii(const char *const filename) {
-      return CImg<T>().load_ascii(filename);
-    }
-
-    //! Load image from an ascii file \overloading.
-    CImg<T>& load_ascii(std::FILE *const file) {
-      return _load_ascii(file,0);
-    }
-
-    //! Loadimage from an ascii file \newinstance.
-    static CImg<T> get_load_ascii(std::FILE *const file) {
-      return CImg<T>().load_ascii(file);
-    }
-
-    CImg<T>& _load_ascii(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_ascii(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      CImg<charT> line(256); *line = 0;
-      int err = std::fscanf(nfile,"%255[^\n]",line._data);
-      unsigned int dx = 0, dy = 1, dz = 1, dc = 1;
-      cimg_sscanf(line,"%u%*c%u%*c%u%*c%u",&dx,&dy,&dz,&dc);
-      err = std::fscanf(nfile,"%*[^0-9.eEinfa+-]");
-      if (!dx || !dy || !dz || !dc) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_ascii(): Invalid ascii header in file '%s', image dimensions are set "
-                              "to (%u,%u,%u,%u).",
-                              cimg_instance,
-                              filename?filename:"(FILE*)",dx,dy,dz,dc);
-      }
-      assign(dx,dy,dz,dc);
-      const ulongT siz = size();
-      ulongT off = 0;
-      double val;
-      T *ptr = _data;
-      for (err = 1, off = 0; off<siz && err==1; ++off) {
-        err = std::fscanf(nfile,"%lf%*[^0-9.eEinfa+-]",&val);
-        *(ptr++) = (T)val;
-      }
-      if (err!=1)
-        cimg::warn(_cimg_instance
-                   "load_ascii(): Only %lu/%lu values read from file '%s'.",
-                   cimg_instance,
-                   off - 1,siz,filename?filename:"(FILE*)");
-
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a DLM file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_dlm(const char *const filename) {
-      return _load_dlm(0,filename);
-    }
-
-    //! Load image from a DLM file \newinstance.
-    static CImg<T> get_load_dlm(const char *const filename) {
-      return CImg<T>().load_dlm(filename);
-    }
-
-    //! Load image from a DLM file \overloading.
-    CImg<T>& load_dlm(std::FILE *const file) {
-      return _load_dlm(file,0);
-    }
-
-    //! Load image from a DLM file \newinstance.
-    static CImg<T> get_load_dlm(std::FILE *const file) {
-      return CImg<T>().load_dlm(file);
-    }
-
-    CImg<T>& _load_dlm(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_dlm(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"r");
-      CImg<charT> delimiter(256), tmp(256); *delimiter = *tmp = 0;
-      unsigned int cdx = 0, dx = 0, dy = 0;
-      int err = 0;
-      double val;
-      assign(256,256,1,1,(T)0);
-      while ((err = std::fscanf(nfile,"%lf%255[^0-9eEinfa.+-]",&val,delimiter._data))>0) {
-        if (err>0) (*this)(cdx++,dy) = (T)val;
-        if (cdx>=_width) resize(3*_width/2,_height,1,1,0);
-        char c = 0;
-        if (!cimg_sscanf(delimiter,"%255[^\n]%c",tmp._data,&c) || c=='\n') {
-          dx = std::max(cdx,dx);
-          if (++dy>=_height) resize(_width,3*_height/2,1,1,0);
-          cdx = 0;
-        }
-      }
-      if (cdx && err==1) { dx = cdx; ++dy; }
-      if (!dx || !dy) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_dlm(): Invalid DLM file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      resize(dx,dy,1,1,0);
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a BMP file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_bmp(const char *const filename) {
-      return _load_bmp(0,filename);
-    }
-
-    //! Load image from a BMP file \newinstance.
-    static CImg<T> get_load_bmp(const char *const filename) {
-      return CImg<T>().load_bmp(filename);
-    }
-
-    //! Load image from a BMP file \overloading.
-    CImg<T>& load_bmp(std::FILE *const file) {
-      return _load_bmp(file,0);
-    }
-
-    //! Load image from a BMP file \newinstance.
-    static CImg<T> get_load_bmp(std::FILE *const file) {
-      return CImg<T>().load_bmp(file);
-    }
-
-    CImg<T>& _load_bmp(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_bmp(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      CImg<ucharT> header(54);
-      cimg::fread(header._data,54,nfile);
-      if (*header!='B' || header[1]!='M') {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_bmp(): Invalid BMP file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-
-      // Read header and pixel buffer
-      int
-        file_size = header[0x02] + (header[0x03]<<8) + (header[0x04]<<16) + (header[0x05]<<24),
-        offset = header[0x0A] + (header[0x0B]<<8) + (header[0x0C]<<16) + (header[0x0D]<<24),
-        header_size = header[0x0E] + (header[0x0F]<<8) + (header[0x10]<<16) + (header[0x11]<<24),
-        dx = header[0x12] + (header[0x13]<<8) + (header[0x14]<<16) + (header[0x15]<<24),
-        dy = header[0x16] + (header[0x17]<<8) + (header[0x18]<<16) + (header[0x19]<<24),
-        compression = header[0x1E] + (header[0x1F]<<8) + (header[0x20]<<16) + (header[0x21]<<24),
-        nb_colors = header[0x2E] + (header[0x2F]<<8) + (header[0x30]<<16) + (header[0x31]<<24),
-        bpp = header[0x1C] + (header[0x1D]<<8);
-
-      if (!file_size || file_size==offset) {
-        cimg::fseek(nfile,0,SEEK_END);
-        file_size = (int)cimg::ftell(nfile);
-        cimg::fseek(nfile,54,SEEK_SET);
-      }
-      if (header_size>40) cimg::fseek(nfile,header_size - 40,SEEK_CUR);
-
-      const int
-        dx_bytes = (bpp==1)?(dx/8 + (dx%8?1:0)):((bpp==4)?(dx/2 + (dx%2)):(dx*bpp/8)),
-        align_bytes = (4 - dx_bytes%4)%4;
-      const longT
-        cimg_iobuffer = (longT)24*1024*1024,
-        buf_size = std::min((longT)cimg::abs(dy)*(dx_bytes + align_bytes),(longT)file_size - offset);
-
-      CImg<intT> colormap;
-      if (bpp<16) { if (!nb_colors) nb_colors = 1<<bpp; } else nb_colors = 0;
-      if (nb_colors) { colormap.assign(nb_colors); cimg::fread(colormap._data,nb_colors,nfile); }
-      const int xoffset = offset - 14 - header_size - 4*nb_colors;
-      if (xoffset>0) cimg::fseek(nfile,xoffset,SEEK_CUR);
-
-      CImg<ucharT> buffer;
-      if (buf_size<cimg_iobuffer) {
-        buffer.assign(cimg::abs(dy)*(dx_bytes + align_bytes),1,1,1,0);
-        cimg::fread(buffer._data,buf_size,nfile);
-      } else buffer.assign(dx_bytes + align_bytes);
-      unsigned char *ptrs = buffer;
-
-      // Decompress buffer (if necessary)
-      if (compression) {
-        if (file)
-          throw CImgIOException(_cimg_instance
-                                "load_bmp(): Unable to load compressed data from '(*FILE)' inputs.",
-                                cimg_instance);
-        else {
-          if (!file) cimg::fclose(nfile);
-          return load_other(filename);
-        }
-      }
-
-      // Read pixel data
-      assign(dx,cimg::abs(dy),1,3);
-      switch (bpp) {
-      case 1 : { // Monochrome
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          unsigned char mask = 0x80, val = 0;
-          cimg_forX(*this,x) {
-            if (mask==0x80) val = *(ptrs++);
-            const unsigned char *col = (unsigned char*)(colormap._data + (val&mask?1:0));
-            (*this)(x,y,2) = (T)*(col++);
-            (*this)(x,y,1) = (T)*(col++);
-            (*this)(x,y,0) = (T)*(col++);
-            mask = cimg::ror(mask);
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      case 4 : { // 16 colors
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          unsigned char mask = 0xF0, val = 0;
-          cimg_forX(*this,x) {
-            if (mask==0xF0) val = *(ptrs++);
-            const unsigned char color = (unsigned char)((mask<16)?(val&mask):((val&mask)>>4));
-            const unsigned char *col = (unsigned char*)(colormap._data + color);
-            (*this)(x,y,2) = (T)*(col++);
-            (*this)(x,y,1) = (T)*(col++);
-            (*this)(x,y,0) = (T)*(col++);
-            mask = cimg::ror(mask,4);
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      case 8 : { //  256 colors
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          cimg_forX(*this,x) {
-            const unsigned char *col = (unsigned char*)(colormap._data + *(ptrs++));
-            (*this)(x,y,2) = (T)*(col++);
-            (*this)(x,y,1) = (T)*(col++);
-            (*this)(x,y,0) = (T)*(col++);
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      case 16 : { // 16 bits colors
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          cimg_forX(*this,x) {
-            const unsigned char c1 = *(ptrs++), c2 = *(ptrs++);
-            const unsigned short col = (unsigned short)(c1|(c2<<8));
-            (*this)(x,y,2) = (T)(col&0x1F);
-            (*this)(x,y,1) = (T)((col>>5)&0x1F);
-            (*this)(x,y,0) = (T)((col>>10)&0x1F);
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      case 24 : { // 24 bits colors
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          cimg_forX(*this,x) {
-            (*this)(x,y,2) = (T)*(ptrs++);
-            (*this)(x,y,1) = (T)*(ptrs++);
-            (*this)(x,y,0) = (T)*(ptrs++);
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      case 32 : { // 32 bits colors
-        for (int y = height() - 1; y>=0; --y) {
-          if (buf_size>=cimg_iobuffer) {
-            cimg::fread(ptrs=buffer._data,dx_bytes,nfile);
-            cimg::fseek(nfile,align_bytes,SEEK_CUR);
-          }
-          cimg_forX(*this,x) {
-            (*this)(x,y,2) = (T)*(ptrs++);
-            (*this)(x,y,1) = (T)*(ptrs++);
-            (*this)(x,y,0) = (T)*(ptrs++);
-            ++ptrs;
-          }
-          ptrs+=align_bytes;
-        }
-      } break;
-      }
-      if (dy<0) mirror('y');
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a JPEG file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_jpeg(const char *const filename) {
-      return _load_jpeg(0,filename);
-    }
-
-    //! Load image from a JPEG file \newinstance.
-    static CImg<T> get_load_jpeg(const char *const filename) {
-      return CImg<T>().load_jpeg(filename);
-    }
-
-    //! Load image from a JPEG file \overloading.
-    CImg<T>& load_jpeg(std::FILE *const file) {
-      return _load_jpeg(file,0);
-    }
-
-    //! Load image from a JPEG file \newinstance.
-    static CImg<T> get_load_jpeg(std::FILE *const file) {
-      return CImg<T>().load_jpeg(file);
-    }
-
-    // Custom error handler for libjpeg.
-#ifdef cimg_use_jpeg
-    struct _cimg_error_mgr {
-      struct jpeg_error_mgr original;
-      jmp_buf setjmp_buffer;
-      char message[JMSG_LENGTH_MAX];
-    };
-
-    typedef struct _cimg_error_mgr *_cimg_error_ptr;
-
-    METHODDEF(void) _cimg_jpeg_error_exit(j_common_ptr cinfo) {
-      _cimg_error_ptr c_err = (_cimg_error_ptr) cinfo->err;  // Return control to the setjmp point
-      (*cinfo->err->format_message)(cinfo,c_err->message);
-      jpeg_destroy(cinfo);  // Clean memory and temp files.
-      longjmp(c_err->setjmp_buffer,1);
-    }
-#endif
-
-    CImg<T>& _load_jpeg(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_jpeg(): Specified filename is (null).",
-                                    cimg_instance);
-
-#ifndef cimg_use_jpeg
-      if (file)
-        throw CImgIOException(_cimg_instance
-                              "load_jpeg(): Unable to load data from '(FILE*)' unless libjpeg is enabled.",
-                              cimg_instance);
-      else return load_other(filename);
-#else
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      struct jpeg_decompress_struct cinfo;
-      struct _cimg_error_mgr jerr;
-      cinfo.err = jpeg_std_error(&jerr.original);
-      jerr.original.error_exit = _cimg_jpeg_error_exit;
-      if (setjmp(jerr.setjmp_buffer)) { // JPEG error
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                             "load_jpeg(): Error message returned by libjpeg: %s.",
-                             cimg_instance,jerr.message);
-      }
-
-      jpeg_create_decompress(&cinfo);
-      jpeg_stdio_src(&cinfo,nfile);
-      jpeg_read_header(&cinfo,TRUE);
-      jpeg_start_decompress(&cinfo);
-
-      if (cinfo.output_components!=1 && cinfo.output_components!=3 && cinfo.output_components!=4) {
-        if (!file) {
-          cimg::fclose(nfile);
-          return load_other(filename);
-        } else
-          throw CImgIOException(_cimg_instance
-                                "load_jpeg(): Failed to load JPEG data from file '%s'.",
-                                cimg_instance,filename?filename:"(FILE*)");
-      }
-      CImg<ucharT> buffer(cinfo.output_width*cinfo.output_components);
-      JSAMPROW row_pointer[1];
-      try { assign(cinfo.output_width,cinfo.output_height,1,cinfo.output_components); }
-      catch (...) { if (!file) cimg::fclose(nfile); throw; }
-      T *ptr_r = _data, *ptr_g = _data + 1UL*_width*_height, *ptr_b = _data + 2UL*_width*_height,
-        *ptr_a = _data + 3UL*_width*_height;
-      while (cinfo.output_scanline<cinfo.output_height) {
-        *row_pointer = buffer._data;
-        if (jpeg_read_scanlines(&cinfo,row_pointer,1)!=1) {
-          cimg::warn(_cimg_instance
-                     "load_jpeg(): Incomplete data in file '%s'.",
-                     cimg_instance,filename?filename:"(FILE*)");
-          break;
-        }
-        const unsigned char *ptrs = buffer._data;
-        switch (_spectrum) {
-        case 1 : {
-          cimg_forX(*this,x) *(ptr_r++) = (T)*(ptrs++);
-        } break;
-        case 3 : {
-          cimg_forX(*this,x) {
-            *(ptr_r++) = (T)*(ptrs++);
-            *(ptr_g++) = (T)*(ptrs++);
-            *(ptr_b++) = (T)*(ptrs++);
-          }
-        } break;
-        case 4 : {
-          cimg_forX(*this,x) {
-            *(ptr_r++) = (T)*(ptrs++);
-            *(ptr_g++) = (T)*(ptrs++);
-            *(ptr_b++) = (T)*(ptrs++);
-            *(ptr_a++) = (T)*(ptrs++);
-          }
-        } break;
-        }
-      }
-      jpeg_finish_decompress(&cinfo);
-      jpeg_destroy_decompress(&cinfo);
-      if (!file) cimg::fclose(nfile);
-      return *this;
-#endif
-    }
-
-    //! Load image from a file, using Magick++ library.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    // Added April/may 2006 by Christoph Hormann <chris_hormann@gmx.de>
-    //   This is experimental code, not much tested, use with care.
-    CImg<T>& load_magick(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_magick(): Specified filename is (null).",
-                                    cimg_instance);
-#ifdef cimg_use_magick
-      Magick::Image image(filename);
-      const unsigned int W = image.size().width(), H = image.size().height();
-      switch (image.type()) {
-      case Magick::PaletteMatteType :
-      case Magick::TrueColorMatteType :
-      case Magick::ColorSeparationType : {
-        assign(W,H,1,4);
-        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
-        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
-        for (ulongT off = (ulongT)W*H; off; --off) {
-          *(ptr_r++) = (T)(pixels->red);
-          *(ptr_g++) = (T)(pixels->green);
-          *(ptr_b++) = (T)(pixels->blue);
-          *(ptr_a++) = (T)(pixels->opacity);
-          ++pixels;
-        }
-      } break;
-      case Magick::PaletteType :
-      case Magick::TrueColorType : {
-        assign(W,H,1,3);
-        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
-        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
-        for (ulongT off = (ulongT)W*H; off; --off) {
-          *(ptr_r++) = (T)(pixels->red);
-          *(ptr_g++) = (T)(pixels->green);
-          *(ptr_b++) = (T)(pixels->blue);
-          ++pixels;
-        }
-      } break;
-      case Magick::GrayscaleMatteType : {
-        assign(W,H,1,2);
-        T *ptr_r = data(0,0,0,0), *ptr_a = data(0,0,0,1);
-        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
-        for (ulongT off = (ulongT)W*H; off; --off) {
-          *(ptr_r++) = (T)(pixels->red);
-          *(ptr_a++) = (T)(pixels->opacity);
-          ++pixels;
-        }
-      } break;
-      default : {
-        assign(W,H,1,1);
-        T *ptr_r = data(0,0,0,0);
-        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
-        for (ulongT off = (ulongT)W*H; off; --off) {
-          *(ptr_r++) = (T)(pixels->red);
-          ++pixels;
-        }
-      }
-      }
-      return *this;
-#else
-      throw CImgIOException(_cimg_instance
-                            "load_magick(): Unable to load file '%s' unless libMagick++ is enabled.",
-                            cimg_instance,
-                            filename);
-#endif
-    }
-
-    //! Load image from a file, using Magick++ library \newinstance.
-    static CImg<T> get_load_magick(const char *const filename) {
-      return CImg<T>().load_magick(filename);
-    }
-
-    //! Load image from a PNG file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_png(const char *const filename, unsigned int *const bits_per_pixel=0) {
-      return _load_png(0,filename,bits_per_pixel);
-    }
-
-    //! Load image from a PNG file \newinstance.
-    static CImg<T> get_load_png(const char *const filename, unsigned int *const bits_per_pixel=0) {
-      return CImg<T>().load_png(filename,bits_per_pixel);
-    }
-
-    //! Load image from a PNG file \overloading.
-    CImg<T>& load_png(std::FILE *const file, unsigned int *const bits_per_pixel=0) {
-      return _load_png(file,0,bits_per_pixel);
-    }
-
-    //! Load image from a PNG file \newinstance.
-    static CImg<T> get_load_png(std::FILE *const file, unsigned int *const bits_per_pixel=0) {
-      return CImg<T>().load_png(file,bits_per_pixel);
-    }
-
-    // (Note: Most of this function has been written by Eric Fausett)
-    CImg<T>& _load_png(std::FILE *const file, const char *const filename, unsigned int *const bits_per_pixel) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_png(): Specified filename is (null).",
-                                    cimg_instance);
-
-#ifndef cimg_use_png
-      cimg::unused(bits_per_pixel);
-      if (file)
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Unable to load data from '(FILE*)' unless libpng is enabled.",
-                              cimg_instance);
-
-      else return load_other(filename);
-#else
-      // Open file and check for PNG validity
-#if defined __GNUC__
-      const char *volatile nfilename = filename; // Use 'volatile' to avoid (wrong) g++ warning.
-      std::FILE *volatile nfile = file?file:cimg::fopen(nfilename,"rb");
-#else
-      const char *nfilename = filename;
-      std::FILE *nfile = file?file:cimg::fopen(nfilename,"rb");
-#endif
-      unsigned char pngCheck[8] = { 0 };
-      cimg::fread(pngCheck,8,(std::FILE*)nfile);
-      if (png_sig_cmp(pngCheck,0,8)) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Invalid PNG file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-
-      // Setup PNG structures for read
-      png_voidp user_error_ptr = 0;
-      png_error_ptr user_error_fn = 0, user_warning_fn = 0;
-      png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,user_error_ptr,user_error_fn,user_warning_fn);
-      if (!png_ptr) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Failed to initialize 'png_ptr' structure for file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_infop info_ptr = png_create_info_struct(png_ptr);
-      if (!info_ptr) {
-        if (!file) cimg::fclose(nfile);
-        png_destroy_read_struct(&png_ptr,(png_infopp)0,(png_infopp)0);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Failed to initialize 'info_ptr' structure for file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_infop end_info = png_create_info_struct(png_ptr);
-      if (!end_info) {
-        if (!file) cimg::fclose(nfile);
-        png_destroy_read_struct(&png_ptr,&info_ptr,(png_infopp)0);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Failed to initialize 'end_info' structure for file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-
-      // Error handling callback for png file reading
-      if (setjmp(png_jmpbuf(png_ptr))) {
-        if (!file) cimg::fclose((std::FILE*)nfile);
-        png_destroy_read_struct(&png_ptr, &end_info, (png_infopp)0);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Encountered unknown fatal error in libpng for file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_init_io(png_ptr, nfile);
-      png_set_sig_bytes(png_ptr, 8);
-
-      // Get PNG Header Info up to data block
-      png_read_info(png_ptr,info_ptr);
-      png_uint_32 W, H;
-      int bit_depth, color_type, interlace_type;
-      bool is_gray = false;
-      png_get_IHDR(png_ptr,info_ptr,&W,&H,&bit_depth,&color_type,&interlace_type,(int*)0,(int*)0);
-      if (bits_per_pixel) *bits_per_pixel = (unsigned int)bit_depth;
-
-      // Transforms to unify image data
-      if (color_type==PNG_COLOR_TYPE_PALETTE) {
-        png_set_palette_to_rgb(png_ptr);
-        color_type = PNG_COLOR_TYPE_RGB;
-        bit_depth = 8;
-      }
-      if (color_type==PNG_COLOR_TYPE_GRAY && bit_depth<8) {
-        png_set_expand_gray_1_2_4_to_8(png_ptr);
-        is_gray = true;
-        bit_depth = 8;
-      }
-      if (png_get_valid(png_ptr,info_ptr,PNG_INFO_tRNS)) {
-        png_set_tRNS_to_alpha(png_ptr);
-        color_type |= PNG_COLOR_MASK_ALPHA;
-      }
-      if (color_type==PNG_COLOR_TYPE_GRAY || color_type==PNG_COLOR_TYPE_GRAY_ALPHA) {
-        png_set_gray_to_rgb(png_ptr);
-        color_type |= PNG_COLOR_MASK_COLOR;
-        is_gray = true;
-      }
-      if (color_type==PNG_COLOR_TYPE_RGB)
-        png_set_filler(png_ptr,0xffffU,PNG_FILLER_AFTER);
-
-      png_read_update_info(png_ptr,info_ptr);
-      if (bit_depth!=8 && bit_depth!=16) {
-        if (!file) cimg::fclose(nfile);
-        png_destroy_read_struct(&png_ptr,&end_info,(png_infopp)0);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Invalid bit depth %u in file '%s'.",
-                              cimg_instance,
-                              bit_depth,nfilename?nfilename:"(FILE*)");
-      }
-      const int byte_depth = bit_depth>>3;
-
-      // Allocate Memory for Image Read
-      png_bytep *const imgData = new png_bytep[H];
-      for (unsigned int row = 0; row<H; ++row) imgData[row] = new png_byte[(size_t)byte_depth*4*W];
-      png_read_image(png_ptr,imgData);
-      png_read_end(png_ptr,end_info);
-
-      // Read pixel data
-      if (color_type!=PNG_COLOR_TYPE_RGB && color_type!=PNG_COLOR_TYPE_RGB_ALPHA) {
-        if (!file) cimg::fclose(nfile);
-        png_destroy_read_struct(&png_ptr,&end_info,(png_infopp)0);
-        throw CImgIOException(_cimg_instance
-                              "load_png(): Invalid color coding type %u in file '%s'.",
-                              cimg_instance,
-                              color_type,nfilename?nfilename:"(FILE*)");
-      }
-      const bool is_alpha = (color_type==PNG_COLOR_TYPE_RGBA);
-      try { assign(W,H,1,(is_gray?1:3) + (is_alpha?1:0)); }
-      catch (...) { if (!file) cimg::fclose(nfile); throw; }
-      T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = is_gray?0:data(0,0,0,1),
-        *ptr_b = is_gray?0:data(0,0,0,2),
-        *ptr_a = !is_alpha?0:data(0,0,0,is_gray?1:3);
-      switch (bit_depth) {
-      case 8 : {
-        cimg_forY(*this,y) {
-          const unsigned char *ptrs = (unsigned char*)imgData[y];
-          cimg_forX(*this,x) {
-            *(ptr_r++) = (T)*(ptrs++);
-            if (ptr_g) *(ptr_g++) = (T)*(ptrs++); else ++ptrs;
-            if (ptr_b) *(ptr_b++) = (T)*(ptrs++); else ++ptrs;
-            if (ptr_a) *(ptr_a++) = (T)*(ptrs++); else ++ptrs;
-          }
-        }
-      } break;
-      case 16 : {
-        cimg_forY(*this,y) {
-          const unsigned short *ptrs = (unsigned short*)(imgData[y]);
-          if (!cimg::endianness()) cimg::invert_endianness(ptrs,4*_width);
-          cimg_forX(*this,x) {
-            *(ptr_r++) = (T)*(ptrs++);
-            if (ptr_g) *(ptr_g++) = (T)*(ptrs++); else ++ptrs;
-            if (ptr_b) *(ptr_b++) = (T)*(ptrs++); else ++ptrs;
-            if (ptr_a) *(ptr_a++) = (T)*(ptrs++); else ++ptrs;
-          }
-        }
-      } break;
-      }
-      png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-
-      // Deallocate Image Read Memory
-      cimg_forY(*this,n) delete[] imgData[n];
-      delete[] imgData;
-      if (!file) cimg::fclose(nfile);
-      return *this;
-#endif
-    }
-
-    //! Load image from a PNM file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_pnm(const char *const filename) {
-      return _load_pnm(0,filename);
-    }
-
-    //! Load image from a PNM file \newinstance.
-    static CImg<T> get_load_pnm(const char *const filename) {
-      return CImg<T>().load_pnm(filename);
-    }
-
-    //! Load image from a PNM file \overloading.
-    CImg<T>& load_pnm(std::FILE *const file) {
-      return _load_pnm(file,0);
-    }
-
-    //! Load image from a PNM file \newinstance.
-    static CImg<T> get_load_pnm(std::FILE *const file) {
-      return CImg<T>().load_pnm(file);
-    }
-
-    CImg<T>& _load_pnm(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_pnm(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      unsigned int ppm_type, W, H, D = 1, colormax = 255;
-      CImg<charT> item(16384,1,1,1,0);
-      int err, rval, gval, bval;
-      const longT cimg_iobuffer = (longT)24*1024*1024;
-      while ((err=std::fscanf(nfile,"%16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-      if (cimg_sscanf(item," P%u",&ppm_type)!=1) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pnm(): PNM header not found in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      while ((err=std::fscanf(nfile," %16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-      if ((err=cimg_sscanf(item," %u %u %u %u",&W,&H,&D,&colormax))<2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pnm(): WIDTH and HEIGHT fields undefined in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (ppm_type!=1 && ppm_type!=4) {
-        if (err==2 || (err==3 && (ppm_type==5 || ppm_type==7 || ppm_type==8 || ppm_type==9))) {
-          while ((err=std::fscanf(nfile," %16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-          if (cimg_sscanf(item,"%u",&colormax)!=1)
-            cimg::warn(_cimg_instance
-                       "load_pnm(): COLORMAX field is undefined in file '%s'.",
-                       cimg_instance,
-                       filename?filename:"(FILE*)");
-        } else { colormax = D; D = 1; }
-      }
-      std::fgetc(nfile);
-
-      switch (ppm_type) {
-      case 1 : { // 2d b&w ascii.
-        assign(W,H,1,1);
-        T* ptrd = _data;
-        cimg_foroff(*this,off) { if (std::fscanf(nfile,"%d",&rval)>0) *(ptrd++) = (T)(rval?0:255); else break; }
-      } break;
-      case 2 : { // 2d grey ascii.
-        assign(W,H,1,1);
-        T* ptrd = _data;
-        cimg_foroff(*this,off) { if (std::fscanf(nfile,"%d",&rval)>0) *(ptrd++) = (T)rval; else break; }
-      } break;
-      case 3 : { // 2d color ascii.
-        assign(W,H,1,3);
-        T *ptrd = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
-        cimg_forXY(*this,x,y) {
-          if (std::fscanf(nfile,"%d %d %d",&rval,&gval,&bval)==3) {
-            *(ptrd++) = (T)rval; *(ptr_g++) = (T)gval; *(ptr_b++) = (T)bval;
-          } else break;
-        }
-      } break;
-      case 4 : { // 2d b&w binary (support 3D PINK extension).
-        CImg<ucharT> raw;
-        assign(W,H,D,1);
-        T *ptrd = data(0,0,0,0);
-        unsigned int w = 0, h = 0, d = 0;
-        for (longT to_read = (longT)((W/8 + (W%8?1:0))*H*D); to_read>0; ) {
-          raw.assign(std::min(to_read,cimg_iobuffer));
-          cimg::fread(raw._data,raw._width,nfile);
-          to_read-=raw._width;
-          const unsigned char *ptrs = raw._data;
-          unsigned char mask = 0, val = 0;
-          for (ulongT off = (ulongT)raw._width; off || mask; mask>>=1) {
-            if (!mask) { if (off--) val = *(ptrs++); mask = 128; }
-            *(ptrd++) = (T)((val&mask)?0:255);
-            if (++w==W) { w = 0; mask = 0; if (++h==H) { h = 0; if (++d==D) break; }}
-          }
-        }
-      } break;
-      case 5 : case 7 : { // 2d/3d grey binary (support 3D PINK extension).
-        if (colormax<256) { // 8 bits.
-          CImg<ucharT> raw;
-          assign(W,H,D,1);
-          T *ptrd = data(0,0,0,0);
-          for (longT to_read = (longT)size(); to_read>0; ) {
-            raw.assign(std::min(to_read,cimg_iobuffer));
-            cimg::fread(raw._data,raw._width,nfile);
-            to_read-=raw._width;
-            const unsigned char *ptrs = raw._data;
-            for (ulongT off = (ulongT)raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
-          }
-        } else { // 16 bits.
-          CImg<ushortT> raw;
-          assign(W,H,D,1);
-          T *ptrd = data(0,0,0,0);
-          for (longT to_read = (longT)size(); to_read>0; ) {
-            raw.assign(std::min(to_read,cimg_iobuffer/2));
-            cimg::fread(raw._data,raw._width,nfile);
-            if (!cimg::endianness()) cimg::invert_endianness(raw._data,raw._width);
-            to_read-=raw._width;
-            const unsigned short *ptrs = raw._data;
-            for (ulongT off = (ulongT)raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
-          }
-        }
-      } break;
-      case 6 : { // 2d color binary.
-        if (colormax<256) { // 8 bits.
-          CImg<ucharT> raw;
-          assign(W,H,1,3);
-          T
-            *ptr_r = data(0,0,0,0),
-            *ptr_g = data(0,0,0,1),
-            *ptr_b = data(0,0,0,2);
-          for (longT to_read = (longT)size(); to_read>0; ) {
-            raw.assign(std::min(to_read,cimg_iobuffer));
-            cimg::fread(raw._data,raw._width,nfile);
-            to_read-=raw._width;
-            const unsigned char *ptrs = raw._data;
-            for (ulongT off = (ulongT)raw._width/3; off; --off) {
-              *(ptr_r++) = (T)*(ptrs++);
-              *(ptr_g++) = (T)*(ptrs++);
-              *(ptr_b++) = (T)*(ptrs++);
-            }
-          }
-        } else { // 16 bits.
-          CImg<ushortT> raw;
-          assign(W,H,1,3);
-          T
-            *ptr_r = data(0,0,0,0),
-            *ptr_g = data(0,0,0,1),
-            *ptr_b = data(0,0,0,2);
-          for (longT to_read = (longT)size(); to_read>0; ) {
-            raw.assign(std::min(to_read,cimg_iobuffer/2));
-            cimg::fread(raw._data,raw._width,nfile);
-            if (!cimg::endianness()) cimg::invert_endianness(raw._data,raw._width);
-            to_read-=raw._width;
-            const unsigned short *ptrs = raw._data;
-            for (ulongT off = (ulongT)raw._width/3; off; --off) {
-              *(ptr_r++) = (T)*(ptrs++);
-              *(ptr_g++) = (T)*(ptrs++);
-              *(ptr_b++) = (T)*(ptrs++);
-            }
-          }
-        }
-      } break;
-      case 8 : { // 2d/3d grey binary with int32 integers (PINK extension).
-        CImg<intT> raw;
-        assign(W,H,D,1);
-        T *ptrd = data(0,0,0,0);
-        for (longT to_read = (longT)size(); to_read>0; ) {
-          raw.assign(std::min(to_read,cimg_iobuffer));
-          cimg::fread(raw._data,raw._width,nfile);
-          to_read-=raw._width;
-          const int *ptrs = raw._data;
-          for (ulongT off = (ulongT)raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
-        }
-      } break;
-      case 9 : { // 2d/3d grey binary with float values (PINK extension).
-        CImg<floatT> raw;
-        assign(W,H,D,1);
-        T *ptrd = data(0,0,0,0);
-        for (longT to_read = (longT)size(); to_read>0; ) {
-          raw.assign(std::min(to_read,cimg_iobuffer));
-          cimg::fread(raw._data,raw._width,nfile);
-          to_read-=raw._width;
-          const float *ptrs = raw._data;
-          for (ulongT off = (ulongT)raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
-        }
-      } break;
-      default :
-        assign();
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pnm(): PNM type 'P%d' found, but type is not supported.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)",ppm_type);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a PFM file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_pfm(const char *const filename) {
-      return _load_pfm(0,filename);
-    }
-
-    //! Load image from a PFM file \newinstance.
-    static CImg<T> get_load_pfm(const char *const filename) {
-      return CImg<T>().load_pfm(filename);
-    }
-
-    //! Load image from a PFM file \overloading.
-    CImg<T>& load_pfm(std::FILE *const file) {
-      return _load_pfm(file,0);
-    }
-
-    //! Load image from a PFM file \newinstance.
-    static CImg<T> get_load_pfm(std::FILE *const file) {
-      return CImg<T>().load_pfm(file);
-    }
-
-    CImg<T>& _load_pfm(std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_pfm(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      char pfm_type;
-      CImg<charT> item(16384,1,1,1,0);
-      int W = 0, H = 0, err = 0;
-      double scale = 0;
-      while ((err=std::fscanf(nfile,"%16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-      if (cimg_sscanf(item," P%c",&pfm_type)!=1) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pfm(): PFM header not found in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      while ((err=std::fscanf(nfile," %16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-      if ((err=cimg_sscanf(item," %d %d",&W,&H))<2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pfm(): WIDTH and HEIGHT fields are undefined in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (err==2) {
-        while ((err=std::fscanf(nfile," %16383[^\n]",item.data()))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
-        if (cimg_sscanf(item,"%lf",&scale)!=1)
-          cimg::warn(_cimg_instance
-                     "load_pfm(): SCALE field is undefined in file '%s'.",
-                     cimg_instance,
-                     filename?filename:"(FILE*)");
-      }
-      std::fgetc(nfile);
-      const bool is_color = (pfm_type=='F'), is_inverted = (scale>0)!=cimg::endianness();
-      if (is_color) {
-        assign(W,H,1,3,(T)0);
-        CImg<floatT> buf(3*W);
-        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
-        cimg_forY(*this,y) {
-          cimg::fread(buf._data,3*W,nfile);
-          if (is_inverted) cimg::invert_endianness(buf._data,3*W);
-          const float *ptrs = buf._data;
-          cimg_forX(*this,x) {
-            *(ptr_r++) = (T)*(ptrs++);
-            *(ptr_g++) = (T)*(ptrs++);
-            *(ptr_b++) = (T)*(ptrs++);
-          }
-        }
-      } else {
-        assign(W,H,1,1,(T)0);
-        CImg<floatT> buf(W);
-        T *ptrd = data(0,0,0,0);
-        cimg_forY(*this,y) {
-          cimg::fread(buf._data,W,nfile);
-          if (is_inverted) cimg::invert_endianness(buf._data,W);
-          const float *ptrs = buf._data;
-          cimg_forX(*this,x) *(ptrd++) = (T)*(ptrs++);
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return mirror('y');  // Most of the .pfm files are flipped along the y-axis.
-    }
-
-    //! Load image from a RGB file.
-    /**
-      \param filename Filename, as a C-string.
-      \param dimw Width of the image buffer.
-      \param dimh Height of the image buffer.
-    **/
-    CImg<T>& load_rgb(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
-      return _load_rgb(0,filename,dimw,dimh);
-    }
-
-    //! Load image from a RGB file \newinstance.
-    static CImg<T> get_load_rgb(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
-      return CImg<T>().load_rgb(filename,dimw,dimh);
-    }
-
-    //! Load image from a RGB file \overloading.
-    CImg<T>& load_rgb(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
-      return _load_rgb(file,0,dimw,dimh);
-    }
-
-    //! Load image from a RGB file \newinstance.
-    static CImg<T> get_load_rgb(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
-      return CImg<T>().load_rgb(file,dimw,dimh);
-    }
-
-    CImg<T>& _load_rgb(std::FILE *const file, const char *const filename,
-                       const unsigned int dimw, const unsigned int dimh) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_rgb(): Specified filename is (null).",
-                                    cimg_instance);
-
-      if (!dimw || !dimh) return assign();
-      const longT cimg_iobuffer = (longT)24*1024*1024;
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      CImg<ucharT> raw;
-      assign(dimw,dimh,1,3);
-      T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = data(0,0,0,1),
-        *ptr_b = data(0,0,0,2);
-      for (longT to_read = (longT)size(); to_read>0; ) {
-        raw.assign(std::min(to_read,cimg_iobuffer));
-        cimg::fread(raw._data,raw._width,nfile);
-        to_read-=raw._width;
-        const unsigned char *ptrs = raw._data;
-        for (ulongT off = raw._width/3UL; off; --off) {
-          *(ptr_r++) = (T)*(ptrs++);
-          *(ptr_g++) = (T)*(ptrs++);
-          *(ptr_b++) = (T)*(ptrs++);
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a RGBA file.
-    /**
-       \param filename Filename, as a C-string.
-       \param dimw Width of the image buffer.
-       \param dimh Height of the image buffer.
-    **/
-    CImg<T>& load_rgba(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
-      return _load_rgba(0,filename,dimw,dimh);
-    }
-
-    //! Load image from a RGBA file \newinstance.
-    static CImg<T> get_load_rgba(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
-      return CImg<T>().load_rgba(filename,dimw,dimh);
-    }
-
-    //! Load image from a RGBA file \overloading.
-    CImg<T>& load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
-      return _load_rgba(file,0,dimw,dimh);
-    }
-
-    //! Load image from a RGBA file \newinstance.
-    static CImg<T> get_load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
-      return CImg<T>().load_rgba(file,dimw,dimh);
-    }
-
-    CImg<T>& _load_rgba(std::FILE *const file, const char *const filename,
-                        const unsigned int dimw, const unsigned int dimh) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_rgba(): Specified filename is (null).",
-                                    cimg_instance);
-
-      if (!dimw || !dimh) return assign();
-      const longT cimg_iobuffer = (longT)24*1024*1024;
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      CImg<ucharT> raw;
-      assign(dimw,dimh,1,4);
-      T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = data(0,0,0,1),
-        *ptr_b = data(0,0,0,2),
-        *ptr_a = data(0,0,0,3);
-      for (longT to_read = (longT)size(); to_read>0; ) {
-        raw.assign(std::min(to_read,cimg_iobuffer));
-        cimg::fread(raw._data,raw._width,nfile);
-        to_read-=raw._width;
-        const unsigned char *ptrs = raw._data;
-        for (ulongT off = raw._width/4UL; off; --off) {
-          *(ptr_r++) = (T)*(ptrs++);
-          *(ptr_g++) = (T)*(ptrs++);
-          *(ptr_b++) = (T)*(ptrs++);
-          *(ptr_a++) = (T)*(ptrs++);
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a TIFF file.
-    /**
-       \param filename Filename, as a C-string.
-       \param first_frame First frame to read (for multi-pages tiff).
-       \param last_frame Last frame to read (for multi-pages tiff).
-       \param step_frame Step value of frame reading.
-       \note
-       - libtiff support is enabled by defining the precompilation
-        directive \c cimg_use_tif.
-       - When libtiff is enabled, 2D and 3D (multipage) several
-        channel per pixel are supported for
-        <tt>char,uchar,short,ushort,float</tt> and \c double pixel types.
-       - If \c cimg_use_tif is not defined at compile time the
-        function uses CImg<T>& load_other(const char*).
-     **/
-    CImg<T>& load_tiff(const char *const filename,
-                       const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                       const unsigned int step_frame=1,
-                       float *const voxel_size=0,
-                       CImg<charT> *const description=0) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_tiff(): Specified filename is (null).",
-                                    cimg_instance);
-
-      const unsigned int
-        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
-        nstep_frame = step_frame?step_frame:1;
-      unsigned int nlast_frame = first_frame<last_frame?last_frame:first_frame;
-
-#ifndef cimg_use_tiff
-      cimg::unused(voxel_size,description);
-      if (nfirst_frame || nlast_frame!=~0U || nstep_frame>1)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_tiff(): Unable to read sub-images from file '%s' unless libtiff is enabled.",
-                                    cimg_instance,
-                                    filename);
-      return load_other(filename);
-#else
-#if cimg_verbosity<3
-      TIFFSetWarningHandler(0);
-      TIFFSetErrorHandler(0);
-#endif
-      TIFF *tif = TIFFOpen(filename,"r");
-      if (tif) {
-        unsigned int nb_images = 0;
-        do ++nb_images; while (TIFFReadDirectory(tif));
-        if (nfirst_frame>=nb_images || (nlast_frame!=~0U && nlast_frame>=nb_images))
-          cimg::warn(_cimg_instance
-                     "load_tiff(): File '%s' contains %u image(s) while specified frame range is [%u,%u] (step %u).",
-                     cimg_instance,
-                     filename,nb_images,nfirst_frame,nlast_frame,nstep_frame);
-
-        if (nfirst_frame>=nb_images) return assign();
-        if (nlast_frame>=nb_images) nlast_frame = nb_images - 1;
-        TIFFSetDirectory(tif,0);
-        CImg<T> frame;
-        for (unsigned int l = nfirst_frame; l<=nlast_frame; l+=nstep_frame) {
-          frame._load_tiff(tif,l,voxel_size,description);
-          if (l==nfirst_frame)
-            assign(frame._width,frame._height,1 + (nlast_frame - nfirst_frame)/nstep_frame,frame._spectrum);
-          if (frame._width>_width || frame._height>_height || frame._spectrum>_spectrum)
-            resize(std::max(frame._width,_width),
-                   std::max(frame._height,_height),-100,
-                   std::max(frame._spectrum,_spectrum),0);
-          draw_image(0,0,(l - nfirst_frame)/nstep_frame,frame);
-        }
-        TIFFClose(tif);
-      } else throw CImgIOException(_cimg_instance
-                                   "load_tiff(): Failed to open file '%s'.",
-                                   cimg_instance,
-                                   filename);
-      return *this;
-#endif
-    }
-
-    //! Load image from a TIFF file \newinstance.
-    static CImg<T> get_load_tiff(const char *const filename,
-                                 const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                 const unsigned int step_frame=1,
-                                 float *const voxel_size=0,
-                                 CImg<charT> *const description=0) {
-      return CImg<T>().load_tiff(filename,first_frame,last_frame,step_frame,voxel_size,description);
-    }
-
-    // (Original contribution by Jerome Boulanger).
-#ifdef cimg_use_tiff
-    template<typename t>
-    void _load_tiff_tiled_contig(TIFF *const tif, const uint16 samplesperpixel,
-                                 const uint32 nx, const uint32 ny, const uint32 tw, const uint32 th) {
-      t *const buf = (t*)_TIFFmalloc(TIFFTileSize(tif));
-      if (buf) {
-        for (unsigned int row = 0; row<ny; row+=th)
-          for (unsigned int col = 0; col<nx; col+=tw) {
-            if (TIFFReadTile(tif,buf,col,row,0,0)<0) {
-              _TIFFfree(buf); TIFFClose(tif);
-              throw CImgIOException(_cimg_instance
-                                    "load_tiff(): Invalid tile in file '%s'.",
-                                    cimg_instance,
-                                    TIFFFileName(tif));
-            }
-            const t *ptr = buf;
-            for (unsigned int rr = row; rr<std::min((unsigned int)(row + th),(unsigned int)ny); ++rr)
-              for (unsigned int cc = col; cc<std::min((unsigned int)(col + tw),(unsigned int)nx); ++cc)
-                for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
-                  (*this)(cc,rr,vv) = (T)(ptr[(rr - row)*th*samplesperpixel + (cc - col)*samplesperpixel + vv]);
-          }
-        _TIFFfree(buf);
-      }
-    }
-
-    template<typename t>
-    void _load_tiff_tiled_separate(TIFF *const tif, const uint16 samplesperpixel,
-                                   const uint32 nx, const uint32 ny, const uint32 tw, const uint32 th) {
-      t *const buf = (t*)_TIFFmalloc(TIFFTileSize(tif));
-      if (buf) {
-        for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
-          for (unsigned int row = 0; row<ny; row+=th)
-            for (unsigned int col = 0; col<nx; col+=tw) {
-              if (TIFFReadTile(tif,buf,col,row,0,vv)<0) {
-                _TIFFfree(buf); TIFFClose(tif);
-                throw CImgIOException(_cimg_instance
-                                      "load_tiff(): Invalid tile in file '%s'.",
-                                      cimg_instance,
-                                      TIFFFileName(tif));
-              }
-              const t *ptr = buf;
-              for (unsigned int rr = row; rr<std::min((unsigned int)(row + th),(unsigned int)ny); ++rr)
-                for (unsigned int cc = col; cc<std::min((unsigned int)(col + tw),(unsigned int)nx); ++cc)
-                  (*this)(cc,rr,vv) = (T)*(ptr++);
-            }
-        _TIFFfree(buf);
-      }
-    }
-
-    template<typename t>
-    void _load_tiff_contig(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny) {
-      t *const buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
-      if (buf) {
-        uint32 row, rowsperstrip = (uint32)-1;
-        TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rowsperstrip);
-        for (row = 0; row<ny; row+= rowsperstrip) {
-          uint32 nrow = (row + rowsperstrip>ny?ny - row:rowsperstrip);
-          tstrip_t strip = TIFFComputeStrip(tif, row, 0);
-          if ((TIFFReadEncodedStrip(tif,strip,buf,-1))<0) {
-            _TIFFfree(buf); TIFFClose(tif);
-            throw CImgIOException(_cimg_instance
-                                  "load_tiff(): Invalid strip in file '%s'.",
-                                  cimg_instance,
-                                  TIFFFileName(tif));
-          }
-          const t *ptr = buf;
-          for (unsigned int rr = 0; rr<nrow; ++rr)
-            for (unsigned int cc = 0; cc<nx; ++cc)
-              for (unsigned int vv = 0; vv<samplesperpixel; ++vv) (*this)(cc,row + rr,vv) = (T)*(ptr++);
-        }
-        _TIFFfree(buf);
-      }
-    }
-
-    template<typename t>
-    void _load_tiff_separate(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny) {
-      t *buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
-      if (buf) {
-        uint32 row, rowsperstrip = (uint32)-1;
-        TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rowsperstrip);
-        for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
-          for (row = 0; row<ny; row+= rowsperstrip) {
-            uint32 nrow = (row + rowsperstrip>ny?ny - row:rowsperstrip);
-            tstrip_t strip = TIFFComputeStrip(tif, row, vv);
-            if ((TIFFReadEncodedStrip(tif,strip,buf,-1))<0) {
-              _TIFFfree(buf); TIFFClose(tif);
-              throw CImgIOException(_cimg_instance
-                                    "load_tiff(): Invalid strip in file '%s'.",
-                                    cimg_instance,
-                                    TIFFFileName(tif));
-            }
-            const t *ptr = buf;
-            for (unsigned int rr = 0;rr<nrow; ++rr)
-              for (unsigned int cc = 0; cc<nx; ++cc)
-                (*this)(cc,row + rr,vv) = (T)*(ptr++);
-          }
-        _TIFFfree(buf);
-      }
-    }
-
-    CImg<T>& _load_tiff(TIFF *const tif, const unsigned int directory,
-                        float *const voxel_size, CImg<charT> *const description) {
-      if (!TIFFSetDirectory(tif,directory)) return assign();
-      uint16 samplesperpixel = 1, bitspersample = 8, photo = 0;
-      uint16 sampleformat = 1;
-      uint32 nx = 1, ny = 1;
-      const char *const filename = TIFFFileName(tif);
-      const bool is_spp = (bool)TIFFGetField(tif,TIFFTAG_SAMPLESPERPIXEL,&samplesperpixel);
-      TIFFGetField(tif,TIFFTAG_IMAGEWIDTH,&nx);
-      TIFFGetField(tif,TIFFTAG_IMAGELENGTH,&ny);
-      TIFFGetField(tif, TIFFTAG_SAMPLEFORMAT, &sampleformat);
-      TIFFGetFieldDefaulted(tif,TIFFTAG_BITSPERSAMPLE,&bitspersample);
-      TIFFGetField(tif,TIFFTAG_PHOTOMETRIC,&photo);
-      if (voxel_size) {
-        const char *s_description = 0;
-        float vx = 0, vy = 0, vz = 0;
-        if (TIFFGetField(tif,TIFFTAG_IMAGEDESCRIPTION,&s_description) && s_description) {
-          const char *s_desc = std::strstr(s_description,"VX=");
-          if (s_desc && cimg_sscanf(s_desc,"VX=%f VY=%f VZ=%f",&vx,&vy,&vz)==3) { // CImg format.
-            voxel_size[0] = vx; voxel_size[1] = vy; voxel_size[2] = vz;
-          }
-          s_desc = std::strstr(s_description,"spacing=");
-          if (s_desc && cimg_sscanf(s_desc,"spacing=%f",&vz)==1) { // fiji format.
-            voxel_size[2] = vz;
-          }
-        }
-        TIFFGetField(tif,TIFFTAG_XRESOLUTION,voxel_size);
-        TIFFGetField(tif,TIFFTAG_YRESOLUTION,voxel_size + 1);
-        voxel_size[0] = 1.0f/voxel_size[0];
-        voxel_size[1] = 1.0f/voxel_size[1];
-      }
-      if (description) {
-        const char *s_description = 0;
-        if (TIFFGetField(tif,TIFFTAG_IMAGEDESCRIPTION,&s_description) && s_description)
-          CImg<charT>::string(s_description).move_to(*description);
-      }
-      const unsigned int spectrum = !is_spp || photo>=3?(photo>1?3:1):samplesperpixel;
-      assign(nx,ny,1,spectrum);
-
-      if ((photo>=3 && sampleformat==1 &&
-           (bitspersample==4 || bitspersample==8) &&
-           (samplesperpixel==1 || samplesperpixel==3 || samplesperpixel==4)) ||
-          (bitspersample==1 && samplesperpixel==1)) {
-        // Special case for unsigned color images.
-        uint32 *const raster = (uint32*)_TIFFmalloc(nx*ny*sizeof(uint32));
-        if (!raster) {
-          _TIFFfree(raster); TIFFClose(tif);
-          throw CImgException(_cimg_instance
-                              "load_tiff(): Failed to allocate memory (%s) for file '%s'.",
-                              cimg_instance,
-                              cimg::strbuffersize(nx*ny*sizeof(uint32)),filename);
-        }
-        TIFFReadRGBAImage(tif,nx,ny,raster,0);
-        switch (spectrum) {
-        case 1 :
-          cimg_forXY(*this,x,y)
-            (*this)(x,y,0) = (T)(float)TIFFGetR(raster[nx*(ny - 1 -y) + x]);
-          break;
-        case 3 :
-          cimg_forXY(*this,x,y) {
-            (*this)(x,y,0) = (T)(float)TIFFGetR(raster[nx*(ny - 1 -y) + x]);
-            (*this)(x,y,1) = (T)(float)TIFFGetG(raster[nx*(ny - 1 -y) + x]);
-            (*this)(x,y,2) = (T)(float)TIFFGetB(raster[nx*(ny - 1 -y) + x]);
-          }
-          break;
-        case 4 :
-          cimg_forXY(*this,x,y) {
-            (*this)(x,y,0) = (T)(float)TIFFGetR(raster[nx*(ny - 1 - y) + x]);
-            (*this)(x,y,1) = (T)(float)TIFFGetG(raster[nx*(ny - 1 - y) + x]);
-            (*this)(x,y,2) = (T)(float)TIFFGetB(raster[nx*(ny - 1 - y) + x]);
-            (*this)(x,y,3) = (T)(float)TIFFGetA(raster[nx*(ny - 1 - y) + x]);
-          }
-          break;
-        }
-        _TIFFfree(raster);
-      } else { // Other cases.
-        uint16 config;
-        TIFFGetField(tif,TIFFTAG_PLANARCONFIG,&config);
-        if (TIFFIsTiled(tif)) {
-          uint32 tw = 1, th = 1;
-          TIFFGetField(tif,TIFFTAG_TILEWIDTH,&tw);
-          TIFFGetField(tif,TIFFTAG_TILELENGTH,&th);
-          if (config==PLANARCONFIG_CONTIG) switch (bitspersample) {
-            case 8 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_contig<unsigned char>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_contig<signed char>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 16 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_contig<unsigned short>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_contig<short>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 32 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_contig<unsigned int>(tif,samplesperpixel,nx,ny,tw,th);
-              else if (sampleformat==SAMPLEFORMAT_INT)
-                _load_tiff_tiled_contig<int>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_contig<float>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 64 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_contig<uint64T>(tif,samplesperpixel,nx,ny,tw,th);
-              else if (sampleformat==SAMPLEFORMAT_INT)
-                _load_tiff_tiled_contig<int64T>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_contig<double>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            } else switch (bitspersample) {
-            case 8 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_separate<unsigned char>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_separate<signed char>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 16 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_separate<unsigned short>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_separate<short>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 32 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_separate<unsigned int>(tif,samplesperpixel,nx,ny,tw,th);
-              else if (sampleformat==SAMPLEFORMAT_INT)
-                _load_tiff_tiled_separate<int>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_separate<float>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            case 64 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_tiled_separate<uint64T>(tif,samplesperpixel,nx,ny,tw,th);
-              else if (sampleformat==SAMPLEFORMAT_INT)
-                _load_tiff_tiled_separate<int64T>(tif,samplesperpixel,nx,ny,tw,th);
-              else _load_tiff_tiled_separate<double>(tif,samplesperpixel,nx,ny,tw,th);
-              break;
-            }
-        } else {
-          if (config==PLANARCONFIG_CONTIG) switch (bitspersample) {
-            case 8 :
-              if (sampleformat==SAMPLEFORMAT_UINT)
-                _load_tiff_contig<unsigned char>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_contig<signed char>(tif,samplesperpixel,nx,ny);
-              break;
-            case 16 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<unsigned short>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_contig<short>(tif,samplesperpixel,nx,ny);
-              break;
-            case 32 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<unsigned int>(tif,samplesperpixel,nx,ny);
-              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_contig<int>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_contig<float>(tif,samplesperpixel,nx,ny);
-              break;
-            case 64 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<uint64T>(tif,samplesperpixel,nx,ny);
-              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_contig<int64T>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_contig<double>(tif,samplesperpixel,nx,ny);
-              break;
-            } else switch (bitspersample) {
-            case 8 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned char>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_separate<signed char>(tif,samplesperpixel,nx,ny);
-              break;
-            case 16 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned short>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_separate<short>(tif,samplesperpixel,nx,ny);
-              break;
-            case 32 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned int>(tif,samplesperpixel,nx,ny);
-              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_separate<int>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_separate<float>(tif,samplesperpixel,nx,ny);
-              break;
-            case 64 :
-              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<uint64T>(tif,samplesperpixel,nx,ny);
-              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_separate<int64T>(tif,samplesperpixel,nx,ny);
-              else _load_tiff_separate<double>(tif,samplesperpixel,nx,ny);
-              break;
-            }
-        }
-      }
-      return *this;
-    }
-#endif
-
-    //! Load image from a MINC2 file.
-    /**
-        \param filename Filename, as a C-string.
-    **/
-    // (Original code by Haz-Edine Assemlal).
-    CImg<T>& load_minc2(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_minc2(): Specified filename is (null).",
-                                    cimg_instance);
-#ifndef cimg_use_minc2
-      return load_other(filename);
-#else
-      minc::minc_1_reader rdr;
-      rdr.open(filename);
-      assign(rdr.ndim(1)?rdr.ndim(1):1,
-             rdr.ndim(2)?rdr.ndim(2):1,
-             rdr.ndim(3)?rdr.ndim(3):1,
-             rdr.ndim(4)?rdr.ndim(4):1);
-      if (typeid(T)==typeid(unsigned char))
-        rdr.setup_read_byte();
-      else if (typeid(T)==typeid(int))
-        rdr.setup_read_int();
-      else if (typeid(T)==typeid(double))
-        rdr.setup_read_double();
-      else
-        rdr.setup_read_float();
-      minc::load_standard_volume(rdr, this->_data);
-      return *this;
-#endif
-    }
-
-    //! Load image from a MINC2 file \newinstance.
-    static CImg<T> get_load_minc2(const char *const filename) {
-      return CImg<T>().load_analyze(filename);
-    }
-
-    //! Load image from an ANALYZE7.5/NIFTI file.
-    /**
-       \param filename Filename, as a C-string.
-       \param[out] voxel_size Pointer to the three voxel sizes read from the file.
-    **/
-    CImg<T>& load_analyze(const char *const filename, float *const voxel_size=0) {
-      return _load_analyze(0,filename,voxel_size);
-    }
-
-    //! Load image from an ANALYZE7.5/NIFTI file \newinstance.
-    static CImg<T> get_load_analyze(const char *const filename, float *const voxel_size=0) {
-      return CImg<T>().load_analyze(filename,voxel_size);
-    }
-
-    //! Load image from an ANALYZE7.5/NIFTI file \overloading.
-    CImg<T>& load_analyze(std::FILE *const file, float *const voxel_size=0) {
-      return _load_analyze(file,0,voxel_size);
-    }
-
-    //! Load image from an ANALYZE7.5/NIFTI file \newinstance.
-    static CImg<T> get_load_analyze(std::FILE *const file, float *const voxel_size=0) {
-      return CImg<T>().load_analyze(file,voxel_size);
-    }
-
-    CImg<T>& _load_analyze(std::FILE *const file, const char *const filename, float *const voxel_size=0) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_analyze(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *nfile_header = 0, *nfile = 0;
-      if (!file) {
-        CImg<charT> body(1024);
-        const char *const ext = cimg::split_filename(filename,body);
-        if (!cimg::strcasecmp(ext,"hdr")) { // File is an Analyze header file.
-          nfile_header = cimg::fopen(filename,"rb");
-          cimg_sprintf(body._data + std::strlen(body),".img");
-          nfile = cimg::fopen(body,"rb");
-        } else if (!cimg::strcasecmp(ext,"img")) { // File is an Analyze data file.
-          nfile = cimg::fopen(filename,"rb");
-          cimg_sprintf(body._data + std::strlen(body),".hdr");
-          nfile_header = cimg::fopen(body,"rb");
-        } else nfile_header = nfile = cimg::fopen(filename,"rb"); // File is a Niftii file.
-      } else nfile_header = nfile = file; // File is a Niftii file.
-      if (!nfile || !nfile_header)
-        throw CImgIOException(_cimg_instance
-                              "load_analyze(): Invalid Analyze7.5 or NIFTI header in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-
-      // Read header.
-      bool endian = false;
-      unsigned int header_size;
-      cimg::fread(&header_size,1,nfile_header);
-      if (!header_size)
-        throw CImgIOException(_cimg_instance
-                              "load_analyze(): Invalid zero-size header in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      if (header_size>=4096) { endian = true; cimg::invert_endianness(header_size); }
-
-      unsigned char *const header = new unsigned char[header_size];
-      cimg::fread(header + 4,header_size - 4,nfile_header);
-      if (!file && nfile_header!=nfile) cimg::fclose(nfile_header);
-      if (endian) {
-        cimg::invert_endianness((short*)(header + 40),5);
-        cimg::invert_endianness((short*)(header + 70),1);
-        cimg::invert_endianness((short*)(header + 72),1);
-        cimg::invert_endianness((float*)(header + 76),4);
-        cimg::invert_endianness((float*)(header + 108),1);
-        cimg::invert_endianness((float*)(header + 112),1);
-      }
-
-      if (nfile_header==nfile) {
-        const unsigned int vox_offset = (unsigned int)*(float*)(header + 108);
-        std::fseek(nfile,vox_offset,SEEK_SET);
-      }
-
-      unsigned short *dim = (unsigned short*)(header + 40), dimx = 1, dimy = 1, dimz = 1, dimv = 1;
-      if (!dim[0])
-        cimg::warn(_cimg_instance
-                   "load_analyze(): File '%s' defines an image with zero dimensions.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      if (dim[0]>4)
-        cimg::warn(_cimg_instance
-                   "load_analyze(): File '%s' defines an image with %u dimensions, reading only the 4 first.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)",dim[0]);
-
-      if (dim[0]>=1) dimx = dim[1];
-      if (dim[0]>=2) dimy = dim[2];
-      if (dim[0]>=3) dimz = dim[3];
-      if (dim[0]>=4) dimv = dim[4];
-      float scalefactor = *(float*)(header + 112); if (scalefactor==0) scalefactor = 1;
-      const unsigned short datatype = *(unsigned short*)(header + 70);
-      if (voxel_size) {
-        const float *vsize = (float*)(header + 76);
-        voxel_size[0] = vsize[1]; voxel_size[1] = vsize[2]; voxel_size[2] = vsize[3];
-      }
-      delete[] header;
-
-      // Read pixel data.
-      assign(dimx,dimy,dimz,dimv);
-      const size_t pdim = (size_t)dimx*dimy*dimz*dimv;
-      switch (datatype) {
-      case 2 : {
-        unsigned char *const buffer = new unsigned char[pdim];
-        cimg::fread(buffer,pdim,nfile);
-        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
-        delete[] buffer;
-      } break;
-      case 4 : {
-        short *const buffer = new short[pdim];
-        cimg::fread(buffer,pdim,nfile);
-        if (endian) cimg::invert_endianness(buffer,pdim);
-        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
-        delete[] buffer;
-      } break;
-      case 8 : {
-        int *const buffer = new int[pdim];
-        cimg::fread(buffer,pdim,nfile);
-        if (endian) cimg::invert_endianness(buffer,pdim);
-        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
-        delete[] buffer;
-      } break;
-      case 16 : {
-        float *const buffer = new float[pdim];
-        cimg::fread(buffer,pdim,nfile);
-        if (endian) cimg::invert_endianness(buffer,pdim);
-        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
-        delete[] buffer;
-      } break;
-      case 64 : {
-        double *const buffer = new double[pdim];
-        cimg::fread(buffer,pdim,nfile);
-        if (endian) cimg::invert_endianness(buffer,pdim);
-        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
-        delete[] buffer;
-      } break;
-      default :
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_analyze(): Unable to load datatype %d in file '%s'",
-                              cimg_instance,
-                              datatype,filename?filename:"(FILE*)");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a .cimg[z] file.
-    /**
-      \param filename Filename, as a C-string.
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    CImg<T>& load_cimg(const char *const filename, const char axis='z', const float align=0) {
-      CImgList<T> list;
-      list.load_cimg(filename);
-      if (list._width==1) return list[0].move_to(*this);
-      return assign(list.get_append(axis,align));
-    }
-
-    //! Load image from a .cimg[z] file \newinstance
-    static CImg<T> get_load_cimg(const char *const filename, const char axis='z', const float align=0) {
-      return CImg<T>().load_cimg(filename,axis,align);
-    }
-
-    //! Load image from a .cimg[z] file \overloading.
-    CImg<T>& load_cimg(std::FILE *const file, const char axis='z', const float align=0) {
-      CImgList<T> list;
-      list.load_cimg(file);
-      if (list._width==1) return list[0].move_to(*this);
-      return assign(list.get_append(axis,align));
-    }
-
-    //! Load image from a .cimg[z] file \newinstance
-    static CImg<T> get_load_cimg(std::FILE *const file, const char axis='z', const float align=0) {
-      return CImg<T>().load_cimg(file,axis,align);
-    }
-
-    //! Load sub-images of a .cimg file.
-    /**
-      \param filename Filename, as a C-string.
-      \param n0 Starting frame.
-      \param n1 Ending frame (~0U for max).
-      \param x0 X-coordinate of the starting sub-image vertex.
-      \param y0 Y-coordinate of the starting sub-image vertex.
-      \param z0 Z-coordinate of the starting sub-image vertex.
-      \param c0 C-coordinate of the starting sub-image vertex.
-      \param x1 X-coordinate of the ending sub-image vertex (~0U for max).
-      \param y1 Y-coordinate of the ending sub-image vertex (~0U for max).
-      \param z1 Z-coordinate of the ending sub-image vertex (~0U for max).
-      \param c1 C-coordinate of the ending sub-image vertex (~0U for max).
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    CImg<T>& load_cimg(const char *const filename,
-                       const unsigned int n0, const unsigned int n1,
-                       const unsigned int x0, const unsigned int y0,
-                       const unsigned int z0, const unsigned int c0,
-                       const unsigned int x1, const unsigned int y1,
-                       const unsigned int z1, const unsigned int c1,
-                       const char axis='z', const float align=0) {
-      CImgList<T> list;
-      list.load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-      if (list._width==1) return list[0].move_to(*this);
-      return assign(list.get_append(axis,align));
-    }
-
-    //! Load sub-images of a .cimg file \newinstance.
-    static CImg<T> get_load_cimg(const char *const filename,
-                                 const unsigned int n0, const unsigned int n1,
-                                 const unsigned int x0, const unsigned int y0,
-                                 const unsigned int z0, const unsigned int c0,
-                                 const unsigned int x1, const unsigned int y1,
-                                 const unsigned int z1, const unsigned int c1,
-                                 const char axis='z', const float align=0) {
-      return CImg<T>().load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1,axis,align);
-    }
-
-    //! Load sub-images of a .cimg file \overloading.
-    CImg<T>& load_cimg(std::FILE *const file,
-                       const unsigned int n0, const unsigned int n1,
-                       const unsigned int x0, const unsigned int y0,
-                       const unsigned int z0, const unsigned int c0,
-                       const unsigned int x1, const unsigned int y1,
-                       const unsigned int z1, const unsigned int c1,
-                       const char axis='z', const float align=0) {
-      CImgList<T> list;
-      list.load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-      if (list._width==1) return list[0].move_to(*this);
-      return assign(list.get_append(axis,align));
-    }
-
-    //! Load sub-images of a .cimg file \newinstance.
-    static CImg<T> get_load_cimg(std::FILE *const file,
-                                 const unsigned int n0, const unsigned int n1,
-                                 const unsigned int x0, const unsigned int y0,
-                                 const unsigned int z0, const unsigned int c0,
-                                 const unsigned int x1, const unsigned int y1,
-                                 const unsigned int z1, const unsigned int c1,
-                                 const char axis='z', const float align=0) {
-      return CImg<T>().load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1,axis,align);
-    }
-
-    //! Load image from an INRIMAGE-4 file.
-    /**
-       \param filename Filename, as a C-string.
-       \param[out] voxel_size Pointer to the three voxel sizes read from the file.
-    **/
-    CImg<T>& load_inr(const char *const filename, float *const voxel_size=0) {
-      return _load_inr(0,filename,voxel_size);
-    }
-
-    //! Load image from an INRIMAGE-4 file \newinstance.
-    static CImg<T> get_load_inr(const char *const filename, float *const voxel_size=0) {
-      return CImg<T>().load_inr(filename,voxel_size);
-    }
-
-    //! Load image from an INRIMAGE-4 file \overloading.
-    CImg<T>& load_inr(std::FILE *const file, float *const voxel_size=0) {
-      return _load_inr(file,0,voxel_size);
-    }
-
-    //! Load image from an INRIMAGE-4 file \newinstance.
-    static CImg<T> get_load_inr(std::FILE *const file, float *voxel_size=0) {
-      return CImg<T>().load_inr(file,voxel_size);
-    }
-
-    static void _load_inr_header(std::FILE *file, int out[8], float *const voxel_size) {
-      CImg<charT> item(1024), tmp1(64), tmp2(64);
-      *item = *tmp1 = *tmp2 = 0;
-      out[0] = std::fscanf(file,"%63s",item._data);
-      out[0] = out[1] = out[2] = out[3] = out[5] = 1; out[4] = out[6] = out[7] = -1;
-      if (cimg::strncasecmp(item,"#INRIMAGE-4#{",13)!=0)
-        throw CImgIOException("CImg<%s>::load_inr(): INRIMAGE-4 header not found.",
-                              pixel_type());
-
-      while (std::fscanf(file," %63[^\n]%*c",item._data)!=EOF && std::strncmp(item,"##}",3)) {
-        cimg_sscanf(item," XDIM%*[^0-9]%d",out);
-        cimg_sscanf(item," YDIM%*[^0-9]%d",out + 1);
-        cimg_sscanf(item," ZDIM%*[^0-9]%d",out + 2);
-        cimg_sscanf(item," VDIM%*[^0-9]%d",out + 3);
-        cimg_sscanf(item," PIXSIZE%*[^0-9]%d",out + 6);
-        if (voxel_size) {
-          cimg_sscanf(item," VX%*[^0-9.+-]%f",voxel_size);
-          cimg_sscanf(item," VY%*[^0-9.+-]%f",voxel_size + 1);
-          cimg_sscanf(item," VZ%*[^0-9.+-]%f",voxel_size + 2);
-        }
-        if (cimg_sscanf(item," CPU%*[ =]%s",tmp1._data)) out[7] = cimg::strncasecmp(tmp1,"sun",3)?0:1;
-        switch (cimg_sscanf(item," TYPE%*[ =]%s %s",tmp1._data,tmp2._data)) {
-        case 0 : break;
-        case 2 : out[5] = cimg::strncasecmp(tmp1,"unsigned",8)?1:0; std::strncpy(tmp1,tmp2,tmp1._width - 1);
-        case 1 :
-          if (!cimg::strncasecmp(tmp1,"int",3) || !cimg::strncasecmp(tmp1,"fixed",5))  out[4] = 0;
-          if (!cimg::strncasecmp(tmp1,"float",5) || !cimg::strncasecmp(tmp1,"double",6)) out[4] = 1;
-          if (!cimg::strncasecmp(tmp1,"packed",6)) out[4] = 2;
-          if (out[4]>=0) break;
-        default :
-          throw CImgIOException("CImg<%s>::load_inr(): Invalid pixel type '%s' defined in header.",
-                                pixel_type(),
-                                tmp2._data);
-        }
-      }
-      if (out[0]<0 || out[1]<0 || out[2]<0 || out[3]<0)
-        throw CImgIOException("CImg<%s>::load_inr(): Invalid dimensions (%d,%d,%d,%d) defined in header.",
-                              pixel_type(),
-                              out[0],out[1],out[2],out[3]);
-      if (out[4]<0 || out[5]<0)
-        throw CImgIOException("CImg<%s>::load_inr(): Incomplete pixel type defined in header.",
-                              pixel_type());
-      if (out[6]<0)
-        throw CImgIOException("CImg<%s>::load_inr(): Incomplete PIXSIZE field defined in header.",
-                              pixel_type());
-      if (out[7]<0)
-        throw CImgIOException("CImg<%s>::load_inr(): Big/Little Endian coding type undefined in header.",
-                              pixel_type());
-    }
-
-    CImg<T>& _load_inr(std::FILE *const file, const char *const filename, float *const voxel_size) {
-#define _cimg_load_inr_case(Tf,sign,pixsize,Ts) \
-     if (!loaded && fopt[6]==pixsize && fopt[4]==Tf && fopt[5]==sign) { \
-        Ts *xval, *const val = new Ts[(size_t)fopt[0]*fopt[3]]; \
-        cimg_forYZ(*this,y,z) { \
-            cimg::fread(val,fopt[0]*fopt[3],nfile); \
-            if (fopt[7]!=endian) cimg::invert_endianness(val,fopt[0]*fopt[3]); \
-            xval = val; cimg_forX(*this,x) cimg_forC(*this,c) (*this)(x,y,z,c) = (T)*(xval++); \
-          } \
-        delete[] val; \
-        loaded = true; \
-      }
-
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_inr(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      int fopt[8], endian = cimg::endianness()?1:0;
-      bool loaded = false;
-      if (voxel_size) voxel_size[0] = voxel_size[1] = voxel_size[2] = 1;
-      _load_inr_header(nfile,fopt,voxel_size);
-      assign(fopt[0],fopt[1],fopt[2],fopt[3]);
-      _cimg_load_inr_case(0,0,8,unsigned char);
-      _cimg_load_inr_case(0,1,8,char);
-      _cimg_load_inr_case(0,0,16,unsigned short);
-      _cimg_load_inr_case(0,1,16,short);
-      _cimg_load_inr_case(0,0,32,unsigned int);
-      _cimg_load_inr_case(0,1,32,int);
-      _cimg_load_inr_case(1,0,32,float);
-      _cimg_load_inr_case(1,1,32,float);
-      _cimg_load_inr_case(1,0,64,double);
-      _cimg_load_inr_case(1,1,64,double);
-      if (!loaded) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_inr(): Unknown pixel type defined in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a EXR file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_exr(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_exr(): Specified filename is (null).",
-                                    cimg_instance);
-#if defined(cimg_use_openexr)
-      Imf::RgbaInputFile file(filename);
-      Imath::Box2i dw = file.dataWindow();
-      const int
-        inwidth = dw.max.x - dw.min.x + 1,
-        inheight = dw.max.y - dw.min.y + 1;
-      Imf::Array2D<Imf::Rgba> pixels;
-      pixels.resizeErase(inheight,inwidth);
-      file.setFrameBuffer(&pixels[0][0] - dw.min.x - dw.min.y*inwidth, 1, inwidth);
-      file.readPixels(dw.min.y, dw.max.y);
-      assign(inwidth,inheight,1,4);
-      T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
-      cimg_forXY(*this,x,y) {
-        *(ptr_r++) = (T)pixels[y][x].r;
-        *(ptr_g++) = (T)pixels[y][x].g;
-        *(ptr_b++) = (T)pixels[y][x].b;
-        *(ptr_a++) = (T)pixels[y][x].a;
-      }
-#elif defined(cimg_use_tinexr)
-      float *res;
-      const char *err = 0;
-      int width = 0, height = 0;
-      const int ret = LoadEXR(&res,&width,&height,filename,&err);
-      if (ret) throw CImgIOException(_cimg_instance
-                                     "load_exr(): Unable to load EXR file '%s'.",
-                                     cimg_instance,filename);
-      CImg<floatT>(out,4,width,height,1,true).get_permute_axes("yzcx").move_to(*this);
-      std::free(res);
-#else
-      return load_other(filename);
-#endif
-      return *this;
-    }
-
-    //! Load image from a EXR file \newinstance.
-    static CImg<T> get_load_exr(const char *const filename) {
-      return CImg<T>().load_exr(filename);
-    }
-
-    //! Load image from a PANDORE-5 file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_pandore(const char *const filename) {
-      return _load_pandore(0,filename);
-    }
-
-    //! Load image from a PANDORE-5 file \newinstance.
-    static CImg<T> get_load_pandore(const char *const filename) {
-      return CImg<T>().load_pandore(filename);
-    }
-
-    //! Load image from a PANDORE-5 file \overloading.
-    CImg<T>& load_pandore(std::FILE *const file) {
-      return _load_pandore(file,0);
-    }
-
-    //! Load image from a PANDORE-5 file \newinstance.
-    static CImg<T> get_load_pandore(std::FILE *const file) {
-      return CImg<T>().load_pandore(file);
-    }
-
-    CImg<T>& _load_pandore(std::FILE *const file, const char *const filename) {
-#define __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,ndim,stype) \
-        cimg::fread(dims,nbdim,nfile); \
-        if (endian) cimg::invert_endianness(dims,nbdim); \
-        assign(nwidth,nheight,ndepth,ndim); \
-        const size_t siz = size(); \
-        stype *buffer = new stype[siz]; \
-        cimg::fread(buffer,siz,nfile); \
-        if (endian) cimg::invert_endianness(buffer,siz); \
-        T *ptrd = _data; \
-        cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++); \
-        buffer-=siz; \
-        delete[] buffer
-
-#define _cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype1,stype2,stype3,ltype) { \
-        if (sizeof(stype1)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype1); } \
-        else if (sizeof(stype2)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype2); } \
-        else if (sizeof(stype3)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype3); } \
-        else throw CImgIOException(_cimg_instance \
-                                   "load_pandore(): Unknown pixel datatype in file '%s'.", \
-                                   cimg_instance, \
-                                   filename?filename:"(FILE*)"); }
-
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_pandore(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      CImg<charT> header(32);
-      cimg::fread(header._data,12,nfile);
-      if (cimg::strncasecmp("PANDORE",header,7)) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pandore(): PANDORE header not found in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      unsigned int imageid, dims[8] = { 0 };
-      int ptbuf[4] = { 0 };
-      cimg::fread(&imageid,1,nfile);
-      const bool endian = imageid>255;
-      if (endian) cimg::invert_endianness(imageid);
-      cimg::fread(header._data,20,nfile);
-
-      switch (imageid) {
-      case 2 : _cimg_load_pandore_case(2,dims[1],1,1,1,unsigned char,unsigned char,unsigned char,1); break;
-      case 3 : _cimg_load_pandore_case(2,dims[1],1,1,1,long,int,short,4); break;
-      case 4 : _cimg_load_pandore_case(2,dims[1],1,1,1,double,float,float,4); break;
-      case 5 : _cimg_load_pandore_case(3,dims[2],dims[1],1,1,unsigned char,unsigned char,unsigned char,1); break;
-      case 6 : _cimg_load_pandore_case(3,dims[2],dims[1],1,1,long,int,short,4); break;
-      case 7 : _cimg_load_pandore_case(3,dims[2],dims[1],1,1,double,float,float,4); break;
-      case 8 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,unsigned char,unsigned char,unsigned char,1); break;
-      case 9 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,long,int,short,4); break;
-      case 10 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,double,float,float,4); break;
-      case 11 : { // Region 1d
-        cimg::fread(dims,3,nfile);
-        if (endian) cimg::invert_endianness(dims,3);
-        assign(dims[1],1,1,1);
-        const unsigned siz = size();
-        if (dims[2]<256) {
-          unsigned char *buffer = new unsigned char[siz];
-          cimg::fread(buffer,siz,nfile);
-          T *ptrd = _data;
-          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-          buffer-=siz;
-          delete[] buffer;
-        } else {
-          if (dims[2]<65536) {
-            unsigned short *buffer = new unsigned short[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          } else {
-            unsigned int *buffer = new unsigned int[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          }
-        }
-      }
-        break;
-      case 12 : { // Region 2d
-        cimg::fread(dims,4,nfile);
-        if (endian) cimg::invert_endianness(dims,4);
-        assign(dims[2],dims[1],1,1);
-        const size_t siz = size();
-        if (dims[3]<256) {
-          unsigned char *buffer = new unsigned char[siz];
-          cimg::fread(buffer,siz,nfile);
-          T *ptrd = _data;
-          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-          buffer-=siz;
-          delete[] buffer;
-        } else {
-          if (dims[3]<65536) {
-            unsigned short *buffer = new unsigned short[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          } else {
-            unsigned int *buffer = new unsigned int[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          }
-        }
-      }
-        break;
-      case 13 : { // Region 3d
-        cimg::fread(dims,5,nfile);
-        if (endian) cimg::invert_endianness(dims,5);
-        assign(dims[3],dims[2],dims[1],1);
-        const size_t siz = size();
-        if (dims[4]<256) {
-          unsigned char *buffer = new unsigned char[siz];
-          cimg::fread(buffer,siz,nfile);
-          T *ptrd = _data;
-          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-          buffer-=siz;
-          delete[] buffer;
-        } else {
-          if (dims[4]<65536) {
-            unsigned short *buffer = new unsigned short[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          } else {
-            unsigned int *buffer = new unsigned int[siz];
-            cimg::fread(buffer,siz,nfile);
-            if (endian) cimg::invert_endianness(buffer,siz);
-            T *ptrd = _data;
-            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
-            buffer-=siz;
-            delete[] buffer;
-          }
-        }
-      }
-        break;
-      case 16 : _cimg_load_pandore_case(4,dims[2],dims[1],1,3,unsigned char,unsigned char,unsigned char,1); break;
-      case 17 : _cimg_load_pandore_case(4,dims[2],dims[1],1,3,long,int,short,4); break;
-      case 18 : _cimg_load_pandore_case(4,dims[2],dims[1],1,3,double,float,float,4); break;
-      case 19 : _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,unsigned char,unsigned char,unsigned char,1); break;
-      case 20 : _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,long,int,short,4); break;
-      case 21 : _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,double,float,float,4); break;
-      case 22 : _cimg_load_pandore_case(2,dims[1],1,1,dims[0],unsigned char,unsigned char,unsigned char,1); break;
-      case 23 : _cimg_load_pandore_case(2,dims[1],1,1,dims[0],long,int,short,4);
-      case 24 : _cimg_load_pandore_case(2,dims[1],1,1,dims[0],unsigned long,unsigned int,unsigned short,4); break;
-      case 25 : _cimg_load_pandore_case(2,dims[1],1,1,dims[0],double,float,float,4); break;
-      case 26 : _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],unsigned char,unsigned char,unsigned char,1); break;
-      case 27 : _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],long,int,short,4); break;
-      case 28 : _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],unsigned long,unsigned int,unsigned short,4); break;
-      case 29 : _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],double,float,float,4); break;
-      case 30 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],unsigned char,unsigned char,unsigned char,1);
-        break;
-      case 31 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],long,int,short,4); break;
-      case 32 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],unsigned long,unsigned int,unsigned short,4);
-        break;
-      case 33 : _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],double,float,float,4); break;
-      case 34 : { // Points 1d
-        cimg::fread(ptbuf,1,nfile);
-        if (endian) cimg::invert_endianness(ptbuf,1);
-        assign(1); (*this)(0) = (T)ptbuf[0];
-      } break;
-      case 35 : { // Points 2d
-        cimg::fread(ptbuf,2,nfile);
-        if (endian) cimg::invert_endianness(ptbuf,2);
-        assign(2); (*this)(0) = (T)ptbuf[1]; (*this)(1) = (T)ptbuf[0];
-      } break;
-      case 36 : { // Points 3d
-        cimg::fread(ptbuf,3,nfile);
-        if (endian) cimg::invert_endianness(ptbuf,3);
-        assign(3); (*this)(0) = (T)ptbuf[2]; (*this)(1) = (T)ptbuf[1]; (*this)(2) = (T)ptbuf[0];
-      } break;
-      default :
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_pandore(): Unable to load data with ID_type %u in file '%s'.",
-                              cimg_instance,
-                              imageid,filename?filename:"(FILE*)");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image from a PAR-REC (Philips) file.
-    /**
-      \param filename Filename, as a C-string.
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    CImg<T>& load_parrec(const char *const filename, const char axis='c', const float align=0) {
-      CImgList<T> list;
-      list.load_parrec(filename);
-      if (list._width==1) return list[0].move_to(*this);
-      return assign(list.get_append(axis,align));
-    }
-
-    //! Load image from a PAR-REC (Philips) file \newinstance.
-    static CImg<T> get_load_parrec(const char *const filename, const char axis='c', const float align=0) {
-      return CImg<T>().load_parrec(filename,axis,align);
-    }
-
-    //! Load image from a raw binary file.
-    /**
-      \param filename Filename, as a C-string.
-      \param size_x Width of the image buffer.
-      \param size_y Height of the image buffer.
-      \param size_z Depth of the image buffer.
-      \param size_c Spectrum of the image buffer.
-      \param is_multiplexed Tells if the image values are multiplexed along the C-axis.
-      \param invert_endianness Tells if the endianness of the image buffer must be inverted.
-      \param offset Starting offset of the read in the specified file.
-    **/
-    CImg<T>& load_raw(const char *const filename,
-                      const unsigned int size_x=0, const unsigned int size_y=1,
-                      const unsigned int size_z=1, const unsigned int size_c=1,
-                      const bool is_multiplexed=false, const bool invert_endianness=false,
-                      const ulongT offset=0) {
-      return _load_raw(0,filename,size_x,size_y,size_z,size_c,is_multiplexed,invert_endianness,offset);
-    }
-
-    //! Load image from a raw binary file \newinstance.
-    static CImg<T> get_load_raw(const char *const filename,
-                                const unsigned int size_x=0, const unsigned int size_y=1,
-                                const unsigned int size_z=1, const unsigned int size_c=1,
-                                const bool is_multiplexed=false, const bool invert_endianness=false,
-                                const ulongT offset=0) {
-      return CImg<T>().load_raw(filename,size_x,size_y,size_z,size_c,is_multiplexed,invert_endianness,offset);
-    }
-
-    //! Load image from a raw binary file \overloading.
-    CImg<T>& load_raw(std::FILE *const file,
-                      const unsigned int size_x=0, const unsigned int size_y=1,
-                      const unsigned int size_z=1, const unsigned int size_c=1,
-                      const bool is_multiplexed=false, const bool invert_endianness=false,
-                      const ulongT offset=0) {
-      return _load_raw(file,0,size_x,size_y,size_z,size_c,is_multiplexed,invert_endianness,offset);
-    }
-
-    //! Load image from a raw binary file \newinstance.
-    static CImg<T> get_load_raw(std::FILE *const file,
-                                const unsigned int size_x=0, const unsigned int size_y=1,
-                                const unsigned int size_z=1, const unsigned int size_c=1,
-                                const bool is_multiplexed=false, const bool invert_endianness=false,
-                                const ulongT offset=0) {
-      return CImg<T>().load_raw(file,size_x,size_y,size_z,size_c,is_multiplexed,invert_endianness,offset);
-    }
-
-    CImg<T>& _load_raw(std::FILE *const file, const char *const filename,
-                       const unsigned int size_x, const unsigned int size_y,
-                       const unsigned int size_z, const unsigned int size_c,
-                       const bool is_multiplexed, const bool invert_endianness,
-                       const ulongT offset) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_raw(): Specified filename is (null).",
-                                    cimg_instance);
-      if (cimg::is_directory(filename))
-        throw CImgArgumentException(_cimg_instance
-                                    "load_raw(): Specified filename '%s' is a directory.",
-                                    cimg_instance,filename);
-
-      ulongT siz = (ulongT)size_x*size_y*size_z*size_c;
-      unsigned int
-        _size_x = size_x,
-        _size_y = size_y,
-        _size_z = size_z,
-        _size_c = size_c;
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      if (!siz) {  // Retrieve file size.
-        const longT fpos = cimg::ftell(nfile);
-        if (fpos<0) throw CImgArgumentException(_cimg_instance
-                                                "load_raw(): Cannot determine size of input file '%s'.",
-                                                cimg_instance,filename?filename:"(FILE*)");
-        cimg::fseek(nfile,0,SEEK_END);
-        siz = cimg::ftell(nfile)/sizeof(T);
-                _size_y = (unsigned int)siz;
-        _size_x = _size_z = _size_c = 1;
-        cimg::fseek(nfile,fpos,SEEK_SET);
-      }
-      cimg::fseek(nfile,offset,SEEK_SET);
-      assign(_size_x,_size_y,_size_z,_size_c,0);
-      if (siz && (!is_multiplexed || size_c==1)) {
-        cimg::fread(_data,siz,nfile);
-        if (invert_endianness) cimg::invert_endianness(_data,siz);
-      } else if (siz) {
-        CImg<T> buf(1,1,1,_size_c);
-        cimg_forXYZ(*this,x,y,z) {
-          cimg::fread(buf._data,_size_c,nfile);
-          if (invert_endianness) cimg::invert_endianness(buf._data,_size_c);
-          set_vector_at(buf,x,y,z);
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load image sequence from a YUV file.
-    /**
-      \param filename Filename, as a C-string.
-      \param size_x Width of the frames.
-      \param size_y Height of the frames.
-      \param first_frame Index of the first frame to read.
-      \param last_frame Index of the last frame to read.
-      \param step_frame Step value for frame reading.
-      \param yuv2rgb Tells if the YUV to RGB transform must be applied.
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-    **/
-    CImg<T>& load_yuv(const char *const filename,
-                      const unsigned int size_x, const unsigned int size_y=1,
-                      const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                      const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z') {
-      return get_load_yuv(filename,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb,axis).move_to(*this);
-    }
-
-    //! Load image sequence from a YUV file \newinstance.
-    static CImg<T> get_load_yuv(const char *const filename,
-                                const unsigned int size_x, const unsigned int size_y=1,
-                                const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z') {
-      return CImgList<T>().load_yuv(filename,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb).get_append(axis);
-    }
-
-    //! Load image sequence from a YUV file \overloading.
-    CImg<T>& load_yuv(std::FILE *const file,
-                      const unsigned int size_x, const unsigned int size_y=1,
-                      const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                      const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z') {
-      return get_load_yuv(file,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb,axis).move_to(*this);
-    }
-
-    //! Load image sequence from a YUV file \newinstance.
-    static CImg<T> get_load_yuv(std::FILE *const file,
-                                const unsigned int size_x, const unsigned int size_y=1,
-                                const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z') {
-      return CImgList<T>().load_yuv(file,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb).get_append(axis);
-    }
-
-    //! Load 3d object from a .OFF file.
-    /**
-        \param[out] primitives Primitives data of the 3d object.
-        \param[out] colors Colors data of the 3d object.
-        \param filename Filename, as a C-string.
-    **/
-    template<typename tf, typename tc>
-    CImg<T>& load_off(CImgList<tf>& primitives, CImgList<tc>& colors, const char *const filename) {
-      return _load_off(primitives,colors,0,filename);
-    }
-
-    //! Load 3d object from a .OFF file \newinstance.
-    template<typename tf, typename tc>
-    static CImg<T> get_load_off(CImgList<tf>& primitives, CImgList<tc>& colors, const char *const filename) {
-      return CImg<T>().load_off(primitives,colors,filename);
-    }
-
-    //! Load 3d object from a .OFF file \overloading.
-    template<typename tf, typename tc>
-    CImg<T>& load_off(CImgList<tf>& primitives, CImgList<tc>& colors, std::FILE *const file) {
-      return _load_off(primitives,colors,file,0);
-    }
-
-    //! Load 3d object from a .OFF file \newinstance.
-    template<typename tf, typename tc>
-    static CImg<T> get_load_off(CImgList<tf>& primitives, CImgList<tc>& colors, std::FILE *const file) {
-      return CImg<T>().load_off(primitives,colors,file);
-    }
-
-    template<typename tf, typename tc>
-    CImg<T>& _load_off(CImgList<tf>& primitives, CImgList<tc>& colors,
-                       std::FILE *const file, const char *const filename) {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_off(): Specified filename is (null).",
-                                    cimg_instance);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"r");
-      unsigned int nb_points = 0, nb_primitives = 0, nb_read = 0;
-      CImg<charT> line(256); *line = 0;
-      int err;
-
-      // Skip comments, and read magic string OFF
-      do { err = std::fscanf(nfile,"%255[^\n] ",line._data); } while (!err || (err==1 && *line=='#'));
-      if (cimg::strncasecmp(line,"OFF",3) && cimg::strncasecmp(line,"COFF",4)) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_off(): OFF header not found in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-      do { err = std::fscanf(nfile,"%255[^\n] ",line._data); } while (!err || (err==1 && *line=='#'));
-      if ((err = cimg_sscanf(line,"%u%u%*[^\n] ",&nb_points,&nb_primitives))!=2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "load_off(): Invalid number of vertices or primitives specified in file '%s'.",
-                              cimg_instance,
-                              filename?filename:"(FILE*)");
-      }
-
-      // Read points data
-      assign(nb_points,3);
-      float X = 0, Y = 0, Z = 0;
-      cimg_forX(*this,l) {
-        do { err = std::fscanf(nfile,"%255[^\n] ",line._data); } while (!err || (err==1 && *line=='#'));
-        if ((err = cimg_sscanf(line,"%f%f%f%*[^\n] ",&X,&Y,&Z))!=3) {
-          if (!file) cimg::fclose(nfile);
-          throw CImgIOException(_cimg_instance
-                                "load_off(): Failed to read vertex %u/%u in file '%s'.",
-                                cimg_instance,
-                                l + 1,nb_points,filename?filename:"(FILE*)");
-        }
-        (*this)(l,0) = (T)X; (*this)(l,1) = (T)Y; (*this)(l,2) = (T)Z;
-      }
-
-      // Read primitive data
-      primitives.assign();
-      colors.assign();
-      bool stop_flag = false;
-      while (!stop_flag) {
-        float c0 = 0.7f, c1 = 0.7f, c2 = 0.7f;
-        unsigned int prim = 0, i0 = 0, i1 = 0, i2 = 0, i3 = 0, i4 = 0, i5 = 0, i6 = 0, i7 = 0;
-        *line = 0;
-        if ((err = std::fscanf(nfile,"%u",&prim))!=1) stop_flag = true;
-        else {
-          ++nb_read;
-          switch (prim) {
-          case 1 : {
-            if ((err = std::fscanf(nfile,"%u%255[^\n] ",&i0,line._data))<2) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0).move_to(primitives);
-              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
-            }
-          } break;
-          case 2 : {
-            if ((err = std::fscanf(nfile,"%u%u%255[^\n] ",&i0,&i1,line._data))<2) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i1).move_to(primitives);
-              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
-            }
-          } break;
-          case 3 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%255[^\n] ",&i0,&i1,&i2,line._data))<3) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i2,i1).move_to(primitives);
-              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
-            }
-          } break;
-          case 4 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,line._data))<4) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
-              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
-            }
-          } break;
-          case 5 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,line._data))<5) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
-              CImg<tf>::vector(i0,i4,i3).move_to(primitives);
-              colors.insert(2,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
-              ++nb_primitives;
-            }
-          } break;
-          case 6 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,line._data))<6) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
-              CImg<tf>::vector(i0,i5,i4,i3).move_to(primitives);
-              colors.insert(2,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
-              ++nb_primitives;
-            }
-          } break;
-          case 7 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,&i6,line._data))<7) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i4,i3,i1).move_to(primitives);
-              CImg<tf>::vector(i0,i6,i5,i4).move_to(primitives);
-              CImg<tf>::vector(i3,i2,i1).move_to(primitives);
-              colors.insert(3,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
-              ++(++nb_primitives);
-            }
-          } break;
-          case 8 : {
-            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,&i6,&i7,line._data))<7) {
-              cimg::warn(_cimg_instance
-                         "load_off(): Failed to read primitive %u/%u from file '%s'.",
-                         cimg_instance,
-                         nb_read,nb_primitives,filename?filename:"(FILE*)");
-
-              err = std::fscanf(nfile,"%*[^\n] ");
-            } else {
-              err = cimg_sscanf(line,"%f%f%f",&c0,&c1,&c2);
-              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
-              CImg<tf>::vector(i0,i5,i4,i3).move_to(primitives);
-              CImg<tf>::vector(i0,i7,i6,i5).move_to(primitives);
-              colors.insert(3,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
-              ++(++nb_primitives);
-            }
-          } break;
-          default :
-            cimg::warn(_cimg_instance
-                       "load_off(): Failed to read primitive %u/%u (%u vertices) from file '%s'.",
-                       cimg_instance,
-                       nb_read,nb_primitives,prim,filename?filename:"(FILE*)");
-
-            err = std::fscanf(nfile,"%*[^\n] ");
-          }
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      if (primitives._width!=nb_primitives)
-        cimg::warn(_cimg_instance
-                   "load_off(): Only %u/%u primitives read from file '%s'.",
-                   cimg_instance,
-                   primitives._width,nb_primitives,filename?filename:"(FILE*)");
-      return *this;
-    }
-
-    //! Load image sequence from a video file, using OpenCV library.
-    /**
-      \param filename Filename, as a C-string.
-      \param first_frame Index of the first frame to read.
-      \param last_frame Index of the last frame to read.
-      \param step_frame Step value for frame reading.
-    **/
-    CImg<T>& load_video(const char *const filename,
-                        const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                        const unsigned int step_frame=1,
-                        const char axis='z', const float align=0) {
-      return get_load_video(filename,first_frame,last_frame,step_frame,axis,align).move_to(*this);
-    }
-
-    //! Load image sequence from a video file, using OpenCV library \newinstance.
-    static CImg<T> get_load_video(const char *const filename,
-                                  const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                  const unsigned int step_frame=1,
-                                  const char axis='z', const float align=0) {
-      return CImgList<T>().load_video(filename,first_frame,last_frame,step_frame).get_append(axis,align);
-    }
-
-    //! Load image sequence using FFMPEG's external tool 'ffmpeg'.
-    /**
-      \param filename Filename, as a C-string.
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    CImg<T>& load_ffmpeg_external(const char *const filename, const char axis='z', const float align=0) {
-      return get_load_ffmpeg_external(filename,axis,align).move_to(*this);
-    }
-
-    //! Load image sequence using FFMPEG's external tool 'ffmpeg' \newinstance.
-    static CImg<T> get_load_ffmpeg_external(const char *const filename, const char axis='z', const float align=0) {
-      return CImgList<T>().load_ffmpeg_external(filename).get_append(axis,align);
-    }
-
-    //! Load gif file, using Imagemagick or GraphicsMagicks's external tools.
-    /**
-      \param filename Filename, as a C-string.
-      \param use_graphicsmagick Tells if GraphicsMagick's tool 'gm' is used instead of ImageMagick's tool 'convert'.
-      \param axis Appending axis, if file contains multiple images. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    CImg<T>& load_gif_external(const char *const filename,
-                               const char axis='z', const float align=0) {
-      return get_load_gif_external(filename,axis,align).move_to(*this);
-    }
-
-    //! Load gif file, using ImageMagick or GraphicsMagick's external tool 'convert' \newinstance.
-    static CImg<T> get_load_gif_external(const char *const filename,
-                                         const char axis='z', const float align=0) {
-      return CImgList<T>().load_gif_external(filename).get_append(axis,align);
-    }
-
-    //! Load image using GraphicsMagick's external tool 'gm'.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_graphicsmagick_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_graphicsmagick_external(): Specified filename is (null).",
-                                    cimg_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256);
-      std::FILE *file = 0;
-      const CImg<charT> s_filename = CImg<charT>::string(filename)._system_strescape();
-#if cimg_OS==1
-      cimg_snprintf(command,command._width,"%s convert \"%s\" pnm:-",
-                    cimg::graphicsmagick_path(),s_filename.data());
-      file = popen(command,"r");
-      if (file) {
-        const unsigned int omode = cimg::exception_mode();
-        cimg::exception_mode(0);
-        try { load_pnm(file); } catch (...) {
-          pclose(file);
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimg_instance
-                                "load_graphicsmagick_external(): Failed to load file '%s' with external command 'gm'.",
-                                cimg_instance,
-                                filename);
-        }
-        pclose(file);
-        return *this;
-      }
-#endif
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.pnm",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s convert \"%s\" \"%s\"",
-                    cimg::graphicsmagick_path(),s_filename.data(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command,cimg::graphicsmagick_path());
-      if (!(file = std_fopen(filename_tmp,"rb"))) {
-        cimg::fclose(cimg::fopen(filename,"r"));
-        throw CImgIOException(_cimg_instance
-                              "load_graphicsmagick_external(): Failed to load file '%s' with external command 'gm'.",
-                              cimg_instance,
-                              filename);
-
-      } else cimg::fclose(file);
-      load_pnm(filename_tmp);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Load image using GraphicsMagick's external tool 'gm' \newinstance.
-    static CImg<T> get_load_graphicsmagick_external(const char *const filename) {
-      return CImg<T>().load_graphicsmagick_external(filename);
-    }
-
-    //! Load gzipped image file, using external tool 'gunzip'.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_gzip_external(const char *const filename) {
-      if (!filename)
-        throw CImgIOException(_cimg_instance
-                              "load_gzip_external(): Specified filename is (null).",
-                              cimg_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      const char
-        *const ext = cimg::split_filename(filename,body),
-        *const ext2 = cimg::split_filename(body,0);
-
-      std::FILE *file = 0;
-      do {
-        if (!cimg::strcasecmp(ext,"gz")) {
-          if (*ext2) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                   cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        } else {
-          if (*ext) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                  cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        }
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s -c \"%s\" > \"%s\"",
-                    cimg::gunzip_path(),
-                    CImg<charT>::string(filename)._system_strescape().data(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command);
-      if (!(file = std_fopen(filename_tmp,"rb"))) {
-        cimg::fclose(cimg::fopen(filename,"r"));
-        throw CImgIOException(_cimg_instance
-                              "load_gzip_external(): Failed to load file '%s' with external command 'gunzip'.",
-                              cimg_instance,
-                              filename);
-
-      } else cimg::fclose(file);
-      load(filename_tmp);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Load gzipped image file, using external tool 'gunzip' \newinstance.
-    static CImg<T> get_load_gzip_external(const char *const filename) {
-      return CImg<T>().load_gzip_external(filename);
-    }
-
-    //! Load image using ImageMagick's external tool 'convert'.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_imagemagick_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_imagemagick_external(): Specified filename is (null).",
-                                    cimg_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256);
-      std::FILE *file = 0;
-      const CImg<charT> s_filename = CImg<charT>::string(filename)._system_strescape();
-#if cimg_OS==1
-      cimg_snprintf(command,command._width,"%s%s \"%s\" pnm:-",
-                    cimg::imagemagick_path(),
-                    !cimg::strcasecmp(cimg::split_filename(filename),"pdf")?" -density 400x400":"",
-                    s_filename.data());
-      file = popen(command,"r");
-      if (file) {
-        const unsigned int omode = cimg::exception_mode();
-        cimg::exception_mode(0);
-        try { load_pnm(file); } catch (...) {
-          pclose(file);
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimg_instance
-                                "load_imagemagick_external(): Failed to load file '%s' with "
-                                "external command 'convert'.",
-                                cimg_instance,
-                                filename);
-        }
-        pclose(file);
-        return *this;
-      }
-#endif
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.pnm",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s%s \"%s\" \"%s\"",
-                    cimg::imagemagick_path(),
-                    !cimg::strcasecmp(cimg::split_filename(filename),"pdf")?" -density 400x400":"",
-                    s_filename.data(),CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command,cimg::imagemagick_path());
-      if (!(file = std_fopen(filename_tmp,"rb"))) {
-        cimg::fclose(cimg::fopen(filename,"r"));
-        throw CImgIOException(_cimg_instance
-                              "load_imagemagick_external(): Failed to load file '%s' with external command 'convert'.",
-                              cimg_instance,
-                              filename);
-
-      } else cimg::fclose(file);
-      load_pnm(filename_tmp);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Load image using ImageMagick's external tool 'convert' \newinstance.
-    static CImg<T> get_load_imagemagick_external(const char *const filename) {
-      return CImg<T>().load_imagemagick_external(filename);
-    }
-
-    //! Load image from a DICOM file, using XMedcon's external tool 'medcon'.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_medcon_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_medcon_external(): Specified filename is (null).",
-                                    cimg_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      cimg::fclose(cimg::fopen(filename,"r"));
-      std::FILE *file = 0;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s.hdr",cimg::filenamerand());
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s -w -c anlz -o \"%s\" -f \"%s\"",
-                    cimg::medcon_path(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    CImg<charT>::string(filename)._system_strescape().data());
-      cimg::system(command);
-      cimg::split_filename(filename_tmp,body);
-
-      cimg_snprintf(command,command._width,"%s.hdr",body._data);
-      file = std_fopen(command,"rb");
-      if (!file) {
-        cimg_snprintf(command,command._width,"m000-%s.hdr",body._data);
-        file = std_fopen(command,"rb");
-        if (!file) {
-          throw CImgIOException(_cimg_instance
-                                "load_medcon_external(): Failed to load file '%s' with external command 'medcon'.",
-                                cimg_instance,
-                                filename);
-        }
-      }
-      cimg::fclose(file);
-      load_analyze(command);
-      std::remove(command);
-      cimg::split_filename(command,body);
-      cimg_snprintf(command,command._width,"%s.img",body._data);
-      std::remove(command);
-      return *this;
-    }
-
-    //! Load image from a DICOM file, using XMedcon's external tool 'medcon' \newinstance.
-    static CImg<T> get_load_medcon_external(const char *const filename) {
-      return CImg<T>().load_medcon_external(filename);
-    }
-
-    //! Load image from a RAW Color Camera file, using external tool 'dcraw'.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_dcraw_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_dcraw_external(): Specified filename is (null).",
-                                    cimg_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256);
-      std::FILE *file = 0;
-      const CImg<charT> s_filename = CImg<charT>::string(filename)._system_strescape();
-#if cimg_OS==1
-      cimg_snprintf(command,command._width,"%s -w -4 -c \"%s\"",
-                    cimg::dcraw_path(),s_filename.data());
-      file = popen(command,"r");
-      if (file) {
-        const unsigned int omode = cimg::exception_mode();
-        cimg::exception_mode(0);
-        try { load_pnm(file); } catch (...) {
-          pclose(file);
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimg_instance
-                                "load_dcraw_external(): Failed to load file '%s' with external command 'dcraw'.",
-                                cimg_instance,
-                                filename);
-        }
-        pclose(file);
-        return *this;
-      }
-#endif
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.ppm",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s -w -4 -c \"%s\" > \"%s\"",
-                    cimg::dcraw_path(),s_filename.data(),CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command,cimg::dcraw_path());
-      if (!(file = std_fopen(filename_tmp,"rb"))) {
-        cimg::fclose(cimg::fopen(filename,"r"));
-        throw CImgIOException(_cimg_instance
-                              "load_dcraw_external(): Failed to load file '%s' with external command 'dcraw'.",
-                              cimg_instance,
-                              filename);
-
-      } else cimg::fclose(file);
-      load_pnm(filename_tmp);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Load image from a RAW Color Camera file, using external tool 'dcraw' \newinstance.
-    static CImg<T> get_load_dcraw_external(const char *const filename) {
-      return CImg<T>().load_dcraw_external(filename);
-    }
-
-    //! Load image from a camera stream, using OpenCV.
-    /**
-       \param camera_index Index of the camera to capture images from.
-       \param skip_frames Number of frames to skip before the capture.
-       \param release_camera Tells if the camera ressource must be released at the end of the method.
-    **/
-    CImg<T>& load_camera(const unsigned int camera_index=0, const unsigned int skip_frames=0,
-                         const bool release_camera=true, const unsigned int capture_width=0,
-                         const unsigned int capture_height=0) {
-#ifdef cimg_use_opencv
-      if (camera_index>99)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_camera(): Invalid request for camera #%u "
-                                    "(no more than 100 cameras can be managed simultaneously).",
-                                    cimg_instance,
-                                    camera_index);
-      static CvCapture *capture[100] = { 0 };
-      static unsigned int capture_w[100], capture_h[100];
-      if (release_camera) {
-        cimg::mutex(9);
-        if (capture[camera_index]) cvReleaseCapture(&(capture[camera_index]));
-        capture[camera_index] = 0;
-        capture_w[camera_index] = capture_h[camera_index] = 0;
-        cimg::mutex(9,0);
-        return *this;
-      }
-      if (!capture[camera_index]) {
-        cimg::mutex(9);
-        capture[camera_index] = cvCreateCameraCapture(camera_index);
-        capture_w[camera_index] = 0;
-        capture_h[camera_index] = 0;
-        cimg::mutex(9,0);
-        if (!capture[camera_index]) {
-          throw CImgIOException(_cimg_instance
-                                "load_camera(): Failed to initialize camera #%u.",
-                                cimg_instance,
-                                camera_index);
-        }
-      }
-      cimg::mutex(9);
-      if (capture_width!=capture_w[camera_index]) {
-        cvSetCaptureProperty(capture[camera_index],CV_CAP_PROP_FRAME_WIDTH,capture_width);
-        capture_w[camera_index] = capture_width;
-      }
-      if (capture_height!=capture_h[camera_index]) {
-        cvSetCaptureProperty(capture[camera_index],CV_CAP_PROP_FRAME_HEIGHT,capture_height);
-        capture_h[camera_index] = capture_height;
-      }
-      const IplImage *img = 0;
-      for (unsigned int i = 0; i<skip_frames; ++i) img = cvQueryFrame(capture[camera_index]);
-      img = cvQueryFrame(capture[camera_index]);
-      if (img) {
-        const int step = (int)(img->widthStep - 3*img->width);
-        assign(img->width,img->height,1,3);
-        const unsigned char* ptrs = (unsigned char*)img->imageData;
-        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
-        if (step>0) cimg_forY(*this,y) {
-            cimg_forX(*this,x) { *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++); }
-            ptrs+=step;
-          } else for (ulongT siz = (ulongT)img->width*img->height; siz; --siz) {
-            *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++);
-          }
-      }
-      cimg::mutex(9,0);
-      return *this;
-#else
-      cimg::unused(camera_index,skip_frames,release_camera,capture_width,capture_height);
-      throw CImgIOException(_cimg_instance
-                            "load_camera(): This function requires the OpenCV library to run "
-                            "(macro 'cimg_use_opencv' must be defined).",
-                            cimg_instance);
-#endif
-    }
-
-    //! Load image from a camera stream, using OpenCV \newinstance.
-    static CImg<T> get_load_camera(const unsigned int camera_index=0, const unsigned int skip_frames=0,
-                                   const bool release_camera=true,
-                                   const unsigned int capture_width=0, const unsigned int capture_height=0) {
-      return CImg<T>().load_camera(camera_index,skip_frames,release_camera,capture_width,capture_height);
-    }
-
-    //! Load image using various non-native ways.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    CImg<T>& load_other(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "load_other(): Specified filename is (null).",
-                                    cimg_instance);
-
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      try { load_magick(filename); }
-      catch (CImgException&) {
-        try { load_imagemagick_external(filename); }
-        catch (CImgException&) {
-          try { load_graphicsmagick_external(filename); }
-          catch (CImgException&) {
-            try { load_cimg(filename); }
-            catch (CImgException&) {
-              try {
-                std::fclose(cimg::fopen(filename,"rb"));
-              } catch (CImgException&) {
-                cimg::exception_mode(omode);
-                throw CImgIOException(_cimg_instance
-                                      "load_other(): Failed to open file '%s'.",
-                                      cimg_instance,
-                                      filename);
-              }
-              cimg::exception_mode(omode);
-              throw CImgIOException(_cimg_instance
-                                    "load_other(): Failed to recognize format of file '%s'.",
-                                    cimg_instance,
-                                    filename);
-            }
-          }
-        }
-      }
-      cimg::exception_mode(omode);
-      return *this;
-    }
-
-    //! Load image using various non-native ways \newinstance.
-    static CImg<T> get_load_other(const char *const filename) {
-      return CImg<T>().load_other(filename);
-    }
-
-    //@}
-    //---------------------------
-    //
-    //! \name Data Output
-    //@{
-    //---------------------------
-
-    //! Display information about the image data.
-    /**
-       \param title Name for the considered image.
-       \param display_stats Tells to compute and display image statistics.
-    **/
-    const CImg<T>& print(const char *const title=0, const bool display_stats=true) const {
-
-      int xm = 0, ym = 0, zm = 0, vm = 0, xM = 0, yM = 0, zM = 0, vM = 0;
-      CImg<doubleT> st;
-      if (!is_empty() && display_stats) {
-        st = get_stats();
-        xm = (int)st[4]; ym = (int)st[5], zm = (int)st[6], vm = (int)st[7];
-        xM = (int)st[8]; yM = (int)st[9], zM = (int)st[10], vM = (int)st[11];
-      }
-
-      const ulongT siz = size(), msiz = siz*sizeof(T), siz1 = siz - 1,
-        mdisp = msiz<8*1024?0U:msiz<8*1024*1024?1U:2U, width1 = _width - 1;
-
-      CImg<charT> _title(64);
-      if (!title) cimg_snprintf(_title,_title._width,"CImg<%s>",pixel_type());
-
-      std::fprintf(cimg::output(),"%s%s%s%s: %sthis%s = %p, %ssize%s = (%u,%u,%u,%u) [%lu %s], %sdata%s = (%s*)%p",
-                   cimg::t_magenta,cimg::t_bold,title?title:_title._data,cimg::t_normal,
-                   cimg::t_bold,cimg::t_normal,(void*)this,
-                   cimg::t_bold,cimg::t_normal,_width,_height,_depth,_spectrum,
-                   (unsigned long)(mdisp==0?msiz:(mdisp==1?(msiz>>10):(msiz>>20))),
-                   mdisp==0?"b":(mdisp==1?"Kio":"Mio"),
-                   cimg::t_bold,cimg::t_normal,pixel_type(),(void*)begin());
-      if (_data)
-        std::fprintf(cimg::output(),"..%p (%s) = [ ",(void*)((char*)end() - 1),_is_shared?"shared":"non-shared");
-      else std::fprintf(cimg::output()," (%s) = [ ",_is_shared?"shared":"non-shared");
-
-      if (!is_empty()) cimg_foroff(*this,off) {
-        std::fprintf(cimg::output(),"%g",(double)_data[off]);
-        if (off!=siz1) std::fprintf(cimg::output(),"%s",off%_width==width1?" ; ":" ");
-        if (off==7 && siz>16) { off = siz1 - 8; std::fprintf(cimg::output(),"... "); }
-      }
-      if (!is_empty() && display_stats)
-        std::fprintf(cimg::output(),
-                     " ], %smin%s = %g, %smax%s = %g, %smean%s = %g, %sstd%s = %g, %scoords_min%s = (%u,%u,%u,%u), "
-                     "%scoords_max%s = (%u,%u,%u,%u).\n",
-                     cimg::t_bold,cimg::t_normal,st[0],
-                     cimg::t_bold,cimg::t_normal,st[1],
-                     cimg::t_bold,cimg::t_normal,st[2],
-                     cimg::t_bold,cimg::t_normal,std::sqrt(st[3]),
-                     cimg::t_bold,cimg::t_normal,xm,ym,zm,vm,
-                     cimg::t_bold,cimg::t_normal,xM,yM,zM,vM);
-      else std::fprintf(cimg::output(),"%s].\n",is_empty()?"":" ");
-      std::fflush(cimg::output());
-      return *this;
-    }
-
-    //! Display image into a CImgDisplay window.
-    /**
-       \param disp Display window.
-    **/
-    const CImg<T>& display(CImgDisplay& disp) const {
-      disp.display(*this);
-      return *this;
-    }
-
-    //! Display image into a CImgDisplay window, in an interactive way.
-    /**
-        \param disp Display window.
-        \param display_info Tells if image information are displayed on the standard output.
-    **/
-    const CImg<T>& display(CImgDisplay &disp, const bool display_info, unsigned int *const XYZ=0,
-                           const bool exit_on_anykey=false) const {
-      return _display(disp,0,display_info,XYZ,exit_on_anykey,false);
-    }
-
-    //! Display image into an interactive window.
-    /**
-        \param title Window title
-        \param display_info Tells if image information are displayed on the standard output.
-    **/
-    const CImg<T>& display(const char *const title=0, const bool display_info=true, unsigned int *const XYZ=0,
-                           const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      return _display(disp,title,display_info,XYZ,exit_on_anykey,false);
-    }
-
-    const CImg<T>& _display(CImgDisplay &disp, const char *const title, const bool display_info,
-                            unsigned int *const XYZ, const bool exit_on_anykey,
-                            const bool exit_on_simpleclick) const {
-      unsigned int oldw = 0, oldh = 0, _XYZ[3] = { 0 }, key = 0;
-      int x0 = 0, y0 = 0, z0 = 0, x1 = width() - 1, y1 = height() - 1, z1 = depth() - 1,
-        old_mouse_x = -1, old_mouse_y = -1;
-
-      if (!disp) {
-        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,1);
-        if (!title) disp.set_title("CImg<%s> (%ux%ux%ux%u)",pixel_type(),_width,_height,_depth,_spectrum);
-        else disp.set_title("%s",title);
-      } else if (title) disp.set_title("%s",title);
-      disp.show().flush();
-
-      const CImg<char> dtitle = CImg<char>::string(disp.title());
-      if (display_info) print(dtitle);
-
-      CImg<T> zoom;
-      for (bool reset_view = true, resize_disp = false, is_first_select = true; !key && !disp.is_closed(); ) {
-        if (reset_view) {
-          if (XYZ) { _XYZ[0] = XYZ[0]; _XYZ[1] = XYZ[1]; _XYZ[2] = XYZ[2]; }
-          else {
-            _XYZ[0] = (unsigned int)(x0 + x1)/2;
-            _XYZ[1] = (unsigned int)(y0 + y1)/2;
-            _XYZ[2] = (unsigned int)(z0 + z1)/2;
-          }
-          x0 = 0; y0 = 0; z0 = 0; x1 = width() - 1; y1 = height() - 1; z1 = depth() - 1;
-          oldw = disp._width; oldh = disp._height;
-          reset_view = false;
-        }
-        if (!x0 && !y0 && !z0 && x1==width() - 1 && y1==height() - 1 && z1==depth() - 1) {
-          if (is_empty()) zoom.assign(1,1,1,1,(T)0); else zoom.assign();
-        } else zoom = get_crop(x0,y0,z0,x1,y1,z1);
-
-        const CImg<T>& visu = zoom?zoom:*this;
-        const unsigned int
-          dx = 1U + x1 - x0, dy = 1U + y1 - y0, dz = 1U + z1 - z0,
-          tw = dx + (dz>1?dz:0U), th = dy + (dz>1?dz:0U);
-        if (!is_empty() && !disp.is_fullscreen() && resize_disp) {
-          const unsigned int
-            ttw = tw*disp.width()/oldw, tth = th*disp.height()/oldh,
-            dM = std::max(ttw,tth), diM = (unsigned int)std::max(disp.width(),disp.height()),
-            imgw = std::max(16U,ttw*diM/dM), imgh = std::max(16U,tth*diM/dM);
-          disp.set_fullscreen(false).resize(cimg_fitscreen(imgw,imgh,1),false);
-          resize_disp = false;
-        }
-        oldw = tw; oldh = th;
-
-        bool
-          go_up = false, go_down = false, go_left = false, go_right = false,
-          go_inc = false, go_dec = false, go_in = false, go_out = false,
-          go_in_center = false;
-
-        disp.set_title("%s",dtitle._data);
-        if (_width>1 && visu._width==1) disp.set_title("%s | x=%u",disp._title,x0);
-        if (_height>1 && visu._height==1) disp.set_title("%s | y=%u",disp._title,y0);
-        if (_depth>1 && visu._depth==1) disp.set_title("%s | z=%u",disp._title,z0);
-
-        if (!is_first_select) {
-          _XYZ[0] = (unsigned int)(x1 - x0)/2;
-          _XYZ[1] = (unsigned int)(y1 - y0)/2;
-          _XYZ[2] = (unsigned int)(z1 - z0)/2;
-        }
-
-        disp._mouse_x = old_mouse_x; disp._mouse_y = old_mouse_y;
-        const CImg<intT> selection = visu._select(disp,0,2,_XYZ,x0,y0,z0,true,is_first_select,_depth>1);
-        old_mouse_x = disp._mouse_x; old_mouse_y = disp._mouse_y;
-        is_first_select = false;
-
-        if (disp.wheel()) {
-          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            go_down = !(go_up = disp.wheel()>0);
-          } else if (disp.is_keySHIFTLEFT() || disp.is_keySHIFTRIGHT()) {
-            go_left = !(go_right = disp.wheel()>0);
-          }
-          else if (disp.is_keyALT() || disp.is_keyALTGR() || _depth==1) {
-            go_out = !(go_in = disp.wheel()>0); go_in_center = false;
-          }
-          disp.set_wheel();
-        }
-
-        const int
-          sx0 = selection(0), sy0 = selection(1), sz0 = selection(2),
-          sx1 = selection(3), sy1 = selection(4), sz1 = selection(5);
-        if (sx0>=0 && sy0>=0 && sz0>=0 && sx1>=0 && sy1>=0 && sz1>=0) {
-          x1 = x0 + sx1; y1 = y0 + sy1; z1 = z0 + sz1;
-          x0+=sx0; y0+=sy0; z0+=sz0;
-          if (sx0==sx1 && sy0==sy1 && sz0==sz1) {
-            if (exit_on_simpleclick && (!zoom || is_empty())) break; else reset_view = true;
-          }
-          resize_disp = true;
-        } else switch (key = disp.key()) {
-#if cimg_OS!=2
-          case cimg::keyCTRLRIGHT : case cimg::keySHIFTRIGHT :
-#endif
-          case 0 : case cimg::keyCTRLLEFT : case cimg::keyPAD5 : case cimg::keySHIFTLEFT :
-#if cimg_OS!=2
-          case cimg::keyALTGR :
-#endif
-          case cimg::keyALT : key = 0; break;
-          case cimg::keyP : if (visu._depth>1 && (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT())) {
-              // Special mode: play stack of frames
-              const unsigned int
-                w1 = visu._width*disp.width()/(visu._width + (visu._depth>1?visu._depth:0)),
-                h1 = visu._height*disp.height()/(visu._height + (visu._depth>1?visu._depth:0));
-              float frame_timing = 5;
-              bool is_stopped = false;
-              disp.set_key(key,false).set_wheel().resize(cimg_fitscreen(w1,h1,1),false); key = 0;
-              for (unsigned int timer = 0; !key && !disp.is_closed() && !disp.button(); ) {
-                if (disp.is_resized()) disp.resize(false);
-                if (!timer) {
-                  visu.get_slice((int)_XYZ[2]).display(disp.set_title("%s | z=%d",dtitle.data(),_XYZ[2]));
-                  (++_XYZ[2])%=visu._depth;
-                }
-                if (!is_stopped) { if (++timer>(unsigned int)frame_timing) timer = 0; } else timer = ~0U;
-                if (disp.wheel()) { frame_timing-=disp.wheel()/3.0f; disp.set_wheel(); }
-                switch (key = disp.key()) {
-#if cimg_OS!=2
-                case cimg::keyCTRLRIGHT :
-#endif
-                case cimg::keyCTRLLEFT : key = 0; break;
-                case cimg::keyPAGEUP : frame_timing-=0.3f; key = 0; break;
-                case cimg::keyPAGEDOWN : frame_timing+=0.3f; key = 0; break;
-                case cimg::keySPACE : is_stopped = !is_stopped; disp.set_key(key,false); key = 0; break;
-                case cimg::keyARROWLEFT : case cimg::keyARROWUP : is_stopped = true; timer = 0; key = 0; break;
-                case cimg::keyARROWRIGHT : case cimg::keyARROWDOWN : is_stopped = true;
-                  (_XYZ[2]+=visu._depth - 2)%=visu._depth; timer = 0; key = 0; break;
-                case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-                    disp.set_fullscreen(false).
-                      resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
-                             CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false);
-                    disp.set_key(key,false); key = 0;
-                  } break;
-                case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-                    disp.set_fullscreen(false).
-                      resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false).set_key(key,false); key = 0;
-                  } break;
-                case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-                    disp.set_fullscreen(false).
-                      resize(cimg_fitscreen(_width,_height,_depth),false).set_key(key,false); key = 0;
-                  } break;
-                case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-                    disp.resize(disp.screen_width(),disp.screen_height(),false).
-                      toggle_fullscreen().set_key(key,false); key = 0;
-                  } break;
-                }
-                frame_timing = frame_timing<1?1:(frame_timing>39?39:frame_timing);
-                disp.wait(20);
-              }
-              const unsigned int
-                w2 = (visu._width + (visu._depth>1?visu._depth:0))*disp.width()/visu._width,
-                h2 = (visu._height + (visu._depth>1?visu._depth:0))*disp.height()/visu._height;
-              disp.resize(cimg_fitscreen(w2,h2,1),false).set_title(dtitle.data()).set_key().set_button().set_wheel();
-              key = 0;
-            } break;
-          case cimg::keyHOME : reset_view = resize_disp = true; key = 0; break;
-          case cimg::keyPADADD : go_in = true; go_in_center = true; key = 0; break;
-          case cimg::keyPADSUB : go_out = true; key = 0; break;
-          case cimg::keyARROWLEFT : case cimg::keyPAD4: go_left = true; key = 0; break;
-          case cimg::keyARROWRIGHT : case cimg::keyPAD6: go_right = true; key = 0; break;
-          case cimg::keyARROWUP : case cimg::keyPAD8: go_up = true; key = 0; break;
-          case cimg::keyARROWDOWN : case cimg::keyPAD2: go_down = true; key = 0; break;
-          case cimg::keyPAD7 : go_up = go_left = true; key = 0; break;
-          case cimg::keyPAD9 : go_up = go_right = true; key = 0; break;
-          case cimg::keyPAD1 : go_down = go_left = true; key = 0; break;
-          case cimg::keyPAD3 : go_down = go_right = true; key = 0; break;
-          case cimg::keyPAGEUP : go_inc = true; key = 0; break;
-          case cimg::keyPAGEDOWN : go_dec = true; key = 0; break;
-          }
-        if (go_in) {
-          const int
-            mx = go_in_center?disp.width()/2:disp.mouse_x(),
-            my = go_in_center?disp.height()/2:disp.mouse_y(),
-            mX = mx*(width() + (depth()>1?depth():0))/disp.width(),
-            mY = my*(height() + (depth()>1?depth():0))/disp.height();
-          int X = (int)_XYZ[0], Y = (int)_XYZ[1], Z = (int)_XYZ[2];
-          if (mX<width() && mY<height())  {
-            X = x0 + mX*(1 + x1 - x0)/width(); Y = y0 + mY*(1 + y1 - y0)/height(); Z = (int)_XYZ[2];
-          }
-          if (mX<width() && mY>=height()) {
-            X = x0 + mX*(1 + x1 - x0)/width(); Z = z0 + (mY - height())*(1 + z1 - z0)/depth(); Y = (int)_XYZ[1];
-          }
-          if (mX>=width() && mY<height()) {
-            Y = y0 + mY*(1 + y1 - y0)/height(); Z = z0 + (mX - width())*(1 + z1 - z0)/depth(); X = (int)_XYZ[0];
-          }
-          if (x1 - x0>4) { x0 = X - 3*(X - x0)/4; x1 = X + 3*(x1 - X)/4; }
-          if (y1 - y0>4) { y0 = Y - 3*(Y - y0)/4; y1 = Y + 3*(y1 - Y)/4; }
-          if (z1 - z0>4) { z0 = Z - 3*(Z - z0)/4; z1 = Z + 3*(z1 - Z)/4; }
-        }
-        if (go_out) {
-          const int
-            delta_x = (x1 - x0)/8, delta_y = (y1 - y0)/8, delta_z = (z1 - z0)/8,
-            ndelta_x = delta_x?delta_x:(_width>1),
-            ndelta_y = delta_y?delta_y:(_height>1),
-            ndelta_z = delta_z?delta_z:(_depth>1);
-          x0-=ndelta_x; y0-=ndelta_y; z0-=ndelta_z;
-          x1+=ndelta_x; y1+=ndelta_y; z1+=ndelta_z;
-          if (x0<0) { x1-=x0; x0 = 0; if (x1>=width()) x1 = width() - 1; }
-          if (y0<0) { y1-=y0; y0 = 0; if (y1>=height()) y1 = height() - 1; }
-          if (z0<0) { z1-=z0; z0 = 0; if (z1>=depth()) z1 = depth() - 1; }
-          if (x1>=width()) { x0-=(x1 - width() + 1); x1 = width() - 1; if (x0<0) x0 = 0; }
-          if (y1>=height()) { y0-=(y1 - height() + 1); y1 = height() - 1; if (y0<0) y0 = 0; }
-          if (z1>=depth()) { z0-=(z1 - depth() + 1); z1 = depth() - 1; if (z0<0) z0 = 0; }
-          const float
-            ratio = (float)(x1-x0)/(y1-y0),
-            ratiow = (float)disp._width/disp._height,
-            sub = std::min(cimg::abs(ratio - ratiow),cimg::abs(1/ratio-1/ratiow));
-          if (sub>0.01) resize_disp = true;
-        }
-        if (go_left) {
-          const int delta = (x1 - x0)/4, ndelta = delta?delta:(_width>1);
-          if (x0 - ndelta>=0) { x0-=ndelta; x1-=ndelta; }
-          else { x1-=x0; x0 = 0; }
-        }
-        if (go_right) {
-          const int delta = (x1 - x0)/4, ndelta = delta?delta:(_width>1);
-          if (x1+ndelta<width()) { x0+=ndelta; x1+=ndelta; }
-          else { x0+=(width() - 1 - x1); x1 = width() - 1; }
-        }
-        if (go_up) {
-          const int delta = (y1 - y0)/4, ndelta = delta?delta:(_height>1);
-          if (y0 - ndelta>=0) { y0-=ndelta; y1-=ndelta; }
-          else { y1-=y0; y0 = 0; }
-        }
-        if (go_down) {
-          const int delta = (y1 - y0)/4, ndelta = delta?delta:(_height>1);
-          if (y1+ndelta<height()) { y0+=ndelta; y1+=ndelta; }
-          else { y0+=(height() - 1 - y1); y1 = height() - 1; }
-        }
-        if (go_inc) {
-          const int delta = (z1 - z0)/4, ndelta = delta?delta:(_depth>1);
-          if (z0 - ndelta>=0) { z0-=ndelta; z1-=ndelta; }
-          else { z1-=z0; z0 = 0; }
-        }
-        if (go_dec) {
-          const int delta = (z1 - z0)/4, ndelta = delta?delta:(_depth>1);
-          if (z1+ndelta<depth()) { z0+=ndelta; z1+=ndelta; }
-          else { z0+=(depth() - 1 - z1); z1 = depth() - 1; }
-        }
-        disp.wait(100);
-        if (!exit_on_anykey && key && key!=cimg::keyESC &&
-            (key!=cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          key = 0;
-        }
-      }
-      disp.set_key(key);
-      if (XYZ) { XYZ[0] = _XYZ[0]; XYZ[1] = _XYZ[1]; XYZ[2] = _XYZ[2]; }
-      return *this;
-    }
-
-    //! Display object 3d in an interactive window.
-    /**
-       \param disp Display window.
-       \param vertices Vertices data of the 3d object.
-       \param primitives Primitives data of the 3d object.
-       \param colors Colors data of the 3d object.
-       \param opacities Opacities data of the 3d object.
-       \param centering Tells if the 3d object must be centered for the display.
-       \param render_static Rendering mode.
-       \param render_motion Rendering mode, when the 3d object is moved.
-       \param is_double_sided Tells if the object primitives are double-sided.
-       \param focale Focale
-       \param light_x X-coordinate of the light source.
-       \param light_y Y-coordinate of the light source.
-       \param light_z Z-coordinate of the light source.
-       \param specular_lightness Amount of specular light.
-       \param specular_shininess Shininess of the object material.
-       \param display_axes Tells if the 3d axes are displayed.
-       \param pose_matrix Pointer to 12 values, defining a 3d pose (as a 4x3 matrix).
-    **/
-    template<typename tp, typename tf, typename tc, typename to>
-    const CImg<T>& display_object3d(CImgDisplay& disp,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const CImgList<tc>& colors,
-                                    const to& opacities,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return _display_object3d(disp,0,vertices,primitives,colors,opacities,centering,render_static,
-                               render_motion,is_double_sided,focale,
-                               light_x,light_y,light_z,specular_lightness,specular_shininess,
-                               display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp, typename tf, typename tc, typename to>
-    const CImg<T>& display_object3d(const char *const title,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const CImgList<tc>& colors,
-                                    const to& opacities,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      return _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,render_static,
-                               render_motion,is_double_sided,focale,
-                               light_x,light_y,light_z,specular_lightness,specular_shininess,
-                               display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp, typename tf, typename tc>
-    const CImg<T>& display_object3d(CImgDisplay &disp,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const CImgList<tc>& colors,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(disp,vertices,primitives,colors,CImgList<floatT>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp, typename tf, typename tc>
-    const CImg<T>& display_object3d(const char *const title,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const CImgList<tc>& colors,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(title,vertices,primitives,colors,CImgList<floatT>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp, typename tf>
-    const CImg<T>& display_object3d(CImgDisplay &disp,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(disp,vertices,primitives,CImgList<T>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp, typename tf>
-    const CImg<T>& display_object3d(const char *const title,
-                                    const CImg<tp>& vertices,
-                                    const CImgList<tf>& primitives,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(title,vertices,primitives,CImgList<T>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp>
-    const CImg<T>& display_object3d(CImgDisplay &disp,
-                                    const CImg<tp>& vertices,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(disp,vertices,CImgList<uintT>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    //! Display object 3d in an interactive window \simplification.
-    template<typename tp>
-    const CImg<T>& display_object3d(const char *const title,
-                                    const CImg<tp>& vertices,
-                                    const bool centering=true,
-                                    const int render_static=4, const int render_motion=1,
-                                    const bool is_double_sided=true, const float focale=700,
-                                    const float light_x=0, const float light_y=0, const float light_z=-5e8f,
-                                    const float specular_lightness=0.2f, const float specular_shininess=0.1f,
-                                    const bool display_axes=true, float *const pose_matrix=0,
-                                    const bool exit_on_anykey=false) const {
-      return display_object3d(title,vertices,CImgList<uintT>(),centering,
-                              render_static,render_motion,is_double_sided,focale,
-                              light_x,light_y,light_z,specular_lightness,specular_shininess,
-                              display_axes,pose_matrix,exit_on_anykey);
-    }
-
-    template<typename tp, typename tf, typename tc, typename to>
-    const CImg<T>& _display_object3d(CImgDisplay& disp, const char *const title,
-                                     const CImg<tp>& vertices,
-                                     const CImgList<tf>& primitives,
-                                     const CImgList<tc>& colors,
-                                     const to& opacities,
-                                     const bool centering,
-                                     const int render_static, const int render_motion,
-                                     const bool is_double_sided, const float focale,
-                                     const float light_x, const float light_y, const float light_z,
-                                     const float specular_lightness, const float specular_shininess,
-                                     const bool display_axes, float *const pose_matrix,
-                                     const bool exit_on_anykey) const {
-      typedef typename cimg::superset<tp,float>::type tpfloat;
-
-      // Check input arguments
-      if (is_empty()) {
-        if (disp) return CImg<T>(disp.width(),disp.height(),1,(colors && colors[0].size()==1)?1:3,0).
-                    _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,
-                                      render_static,render_motion,is_double_sided,focale,
-                                      light_x,light_y,light_z,specular_lightness,specular_shininess,
-                                      display_axes,pose_matrix,exit_on_anykey);
-        else return CImg<T>(1,2,1,1,64,128).resize(cimg_fitscreen(CImgDisplay::screen_width()/2,
-                                                                  CImgDisplay::screen_height()/2,1),
-                                                   1,(colors && colors[0].size()==1)?1:3,3).
-               _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,
-                                 render_static,render_motion,is_double_sided,focale,
-                                 light_x,light_y,light_z,specular_lightness,specular_shininess,
-                                 display_axes,pose_matrix,exit_on_anykey);
-      } else { if (disp) disp.resize(*this,false); }
-      CImg<charT> error_message(1024);
-      if (!vertices.is_object3d(primitives,colors,opacities,true,error_message))
-        throw CImgArgumentException(_cimg_instance
-                                    "display_object3d(): Invalid specified 3d object (%u,%u) (%s).",
-                                    cimg_instance,vertices._width,primitives._width,error_message.data());
-      if (vertices._width && !primitives) {
-        CImgList<tf> nprimitives(vertices._width,1,1,1,1);
-        cimglist_for(nprimitives,l) nprimitives(l,0) = (tf)l;
-        return _display_object3d(disp,title,vertices,nprimitives,colors,opacities,centering,
-                                 render_static,render_motion,is_double_sided,focale,
-                                 light_x,light_y,light_z,specular_lightness,specular_shininess,
-                                 display_axes,pose_matrix,exit_on_anykey);
-      }
-      if (!disp) {
-        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,3);
-        if (!title) disp.set_title("CImg<%s> (%u vertices, %u primitives)",
-                                   pixel_type(),vertices._width,primitives._width);
-      } else if (title) disp.set_title("%s",title);
-
-      // Init 3d objects and compute object statistics
-      CImg<floatT>
-        pose,
-        rotated_vertices(vertices._width,3),
-        bbox_vertices, rotated_bbox_vertices,
-        axes_vertices, rotated_axes_vertices,
-        bbox_opacities, axes_opacities;
-      CImgList<uintT> bbox_primitives, axes_primitives;
-      CImgList<tf> reverse_primitives;
-      CImgList<T> bbox_colors, bbox_colors2, axes_colors;
-      unsigned int ns_width = 0, ns_height = 0;
-      int _is_double_sided = (int)is_double_sided;
-      bool ndisplay_axes = display_axes;
-      const CImg<T>
-        background_color(1,1,1,_spectrum,0),
-        foreground_color(1,1,1,_spectrum,255);
-      float
-        Xoff = 0, Yoff = 0, Zoff = 0, sprite_scale = 1,
-        xm = 0, xM = vertices?vertices.get_shared_row(0).max_min(xm):0,
-        ym = 0, yM = vertices?vertices.get_shared_row(1).max_min(ym):0,
-        zm = 0, zM = vertices?vertices.get_shared_row(2).max_min(zm):0;
-      const float delta = cimg::max(xM - xm,yM - ym,zM - zm);
-
-      rotated_bbox_vertices = bbox_vertices.assign(8,3,1,1,
-                                                   xm,xM,xM,xm,xm,xM,xM,xm,
-                                                   ym,ym,yM,yM,ym,ym,yM,yM,
-                                                   zm,zm,zm,zm,zM,zM,zM,zM);
-      bbox_primitives.assign(6,1,4,1,1, 0,3,2,1, 4,5,6,7, 1,2,6,5, 0,4,7,3, 0,1,5,4, 2,3,7,6);
-      bbox_colors.assign(6,_spectrum,1,1,1,background_color[0]);
-      bbox_colors2.assign(6,_spectrum,1,1,1,foreground_color[0]);
-      bbox_opacities.assign(bbox_colors._width,1,1,1,0.3f);
-
-      rotated_axes_vertices = axes_vertices.assign(7,3,1,1,
-                                                   0,20,0,0,22,-6,-6,
-                                                   0,0,20,0,-6,22,-6,
-                                                   0,0,0,20,0,0,22);
-      axes_opacities.assign(3,1,1,1,1);
-      axes_colors.assign(3,_spectrum,1,1,1,foreground_color[0]);
-      axes_primitives.assign(3,1,2,1,1, 0,1, 0,2, 0,3);
-
-      // Begin user interaction loop
-      CImg<T> visu0(*this), visu;
-      CImg<tpfloat> zbuffer(visu0.width(),visu0.height(),1,1,0);
-      bool init_pose = true, clicked = false, redraw = true;
-      unsigned int key = 0;
-      int
-        x0 = 0, y0 = 0, x1 = 0, y1 = 0,
-        nrender_static = render_static,
-        nrender_motion = render_motion;
-      disp.show().flush();
-
-      while (!disp.is_closed() && !key) {
-
-        // Init object pose
-        if (init_pose) {
-          const float
-            ratio = delta>0?(2.0f*std::min(disp.width(),disp.height())/(3.0f*delta)):1,
-            dx = (xM + xm)/2, dy = (yM + ym)/2, dz = (zM + zm)/2;
-          if (centering)
-            CImg<floatT>(4,3,1,1, ratio,0.,0.,-ratio*dx, 0.,ratio,0.,-ratio*dy, 0.,0.,ratio,-ratio*dz).move_to(pose);
-          else CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0).move_to(pose);
-          if (pose_matrix) {
-            CImg<floatT> pose0(pose_matrix,4,3,1,1,false);
-            pose0.resize(4,4,1,1,0); pose.resize(4,4,1,1,0);
-            pose0(3,3) = pose(3,3) = 1;
-            (pose0*pose).get_crop(0,0,3,2).move_to(pose);
-            Xoff = pose_matrix[12]; Yoff = pose_matrix[13]; Zoff = pose_matrix[14]; sprite_scale = pose_matrix[15];
-          } else { Xoff = Yoff = Zoff = 0; sprite_scale = 1; }
-          init_pose = false;
-          redraw = true;
-        }
-
-        // Rotate and draw 3d object
-        if (redraw) {
-          const float
-            r00 = pose(0,0), r10 = pose(1,0), r20 = pose(2,0), r30 = pose(3,0),
-            r01 = pose(0,1), r11 = pose(1,1), r21 = pose(2,1), r31 = pose(3,1),
-            r02 = pose(0,2), r12 = pose(1,2), r22 = pose(2,2), r32 = pose(3,2);
-          if ((clicked && nrender_motion>=0) || (!clicked && nrender_static>=0))
-            cimg_forX(vertices,l) {
-              const float x = (float)vertices(l,0), y = (float)vertices(l,1), z = (float)vertices(l,2);
-              rotated_vertices(l,0) = r00*x + r10*y + r20*z + r30;
-              rotated_vertices(l,1) = r01*x + r11*y + r21*z + r31;
-              rotated_vertices(l,2) = r02*x + r12*y + r22*z + r32;
-            }
-          else cimg_forX(bbox_vertices,l) {
-              const float x = bbox_vertices(l,0), y = bbox_vertices(l,1), z = bbox_vertices(l,2);
-              rotated_bbox_vertices(l,0) = r00*x + r10*y + r20*z + r30;
-              rotated_bbox_vertices(l,1) = r01*x + r11*y + r21*z + r31;
-              rotated_bbox_vertices(l,2) = r02*x + r12*y + r22*z + r32;
-            }
-
-          // Draw objects
-          const bool render_with_zbuffer = !clicked && nrender_static>0;
-          visu = visu0;
-          if ((clicked && nrender_motion<0) || (!clicked && nrender_static<0))
-            visu.draw_object3d(Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
-                               rotated_bbox_vertices,bbox_primitives,bbox_colors,bbox_opacities,2,false,focale).
-              draw_object3d(Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
-                            rotated_bbox_vertices,bbox_primitives,bbox_colors2,1,false,focale);
-          else visu._draw_object3d((void*)0,render_with_zbuffer?zbuffer.fill(0):CImg<tpfloat>::empty(),
-                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
-                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
-                                   colors,opacities,clicked?nrender_motion:nrender_static,_is_double_sided==1,focale,
-                                   width()/2.0f + light_x,height()/2.0f + light_y,light_z + Zoff,
-                                   specular_lightness,specular_shininess,sprite_scale);
-          // Draw axes
-          if (ndisplay_axes) {
-            const float
-              n = 1e-8f + cimg::hypot(r00,r01,r02),
-              _r00 = r00/n, _r10 = r10/n, _r20 = r20/n,
-              _r01 = r01/n, _r11 = r11/n, _r21 = r21/n,
-              _r02 = r01/n, _r12 = r12/n, _r22 = r22/n,
-              Xaxes = 25, Yaxes = visu._height - 38.0f;
-            cimg_forX(axes_vertices,l) {
-              const float
-                x = axes_vertices(l,0),
-                y = axes_vertices(l,1),
-                z = axes_vertices(l,2);
-              rotated_axes_vertices(l,0) = _r00*x + _r10*y + _r20*z;
-              rotated_axes_vertices(l,1) = _r01*x + _r11*y + _r21*z;
-              rotated_axes_vertices(l,2) = _r02*x + _r12*y + _r22*z;
-            }
-            axes_opacities(0,0) = (rotated_axes_vertices(1,2)>0)?0.5f:1.0f;
-            axes_opacities(1,0) = (rotated_axes_vertices(2,2)>0)?0.5f:1.0f;
-            axes_opacities(2,0) = (rotated_axes_vertices(3,2)>0)?0.5f:1.0f;
-            visu.draw_object3d(Xaxes,Yaxes,0,rotated_axes_vertices,axes_primitives,
-                               axes_colors,axes_opacities,1,false,focale).
-              draw_text((int)(Xaxes + rotated_axes_vertices(4,0)),
-                        (int)(Yaxes + rotated_axes_vertices(4,1)),
-                        "X",axes_colors[0]._data,0,axes_opacities(0,0),13).
-              draw_text((int)(Xaxes + rotated_axes_vertices(5,0)),
-                        (int)(Yaxes + rotated_axes_vertices(5,1)),
-                        "Y",axes_colors[1]._data,0,axes_opacities(1,0),13).
-              draw_text((int)(Xaxes + rotated_axes_vertices(6,0)),
-                        (int)(Yaxes + rotated_axes_vertices(6,1)),
-                        "Z",axes_colors[2]._data,0,axes_opacities(2,0),13);
-          }
-          visu.display(disp);
-          if (!clicked || nrender_motion==nrender_static) redraw = false;
-        }
-
-        // Handle user interaction
-        disp.wait();
-        if ((disp.button() || disp.wheel()) && disp.mouse_x()>=0 && disp.mouse_y()>=0) {
-          redraw = true;
-          if (!clicked) { x0 = x1 = disp.mouse_x(); y0 = y1 = disp.mouse_y(); if (!disp.wheel()) clicked = true; }
-          else { x1 = disp.mouse_x(); y1 = disp.mouse_y(); }
-          if (disp.button()&1) {
-            const float
-              R = 0.45f*std::min(disp.width(),disp.height()),
-              R2 = R*R,
-              u0 = (float)(x0 - disp.width()/2),
-              v0 = (float)(y0 - disp.height()/2),
-              u1 = (float)(x1 - disp.width()/2),
-              v1 = (float)(y1 - disp.height()/2),
-              n0 = cimg::hypot(u0,v0),
-              n1 = cimg::hypot(u1,v1),
-              nu0 = n0>R?(u0*R/n0):u0,
-              nv0 = n0>R?(v0*R/n0):v0,
-              nw0 = (float)std::sqrt(std::max(0.0f,R2 - nu0*nu0 - nv0*nv0)),
-              nu1 = n1>R?(u1*R/n1):u1,
-              nv1 = n1>R?(v1*R/n1):v1,
-              nw1 = (float)std::sqrt(std::max(0.0f,R2 - nu1*nu1 - nv1*nv1)),
-              u = nv0*nw1 - nw0*nv1,
-              v = nw0*nu1 - nu0*nw1,
-              w = nv0*nu1 - nu0*nv1,
-              n = cimg::hypot(u,v,w),
-              alpha = (float)std::asin(n/R2)*180/cimg::PI;
-            (CImg<floatT>::rotation_matrix(u,v,w,-alpha)*pose).move_to(pose);
-            x0 = x1; y0 = y1;
-          }
-          if (disp.button()&2) {
-            if (focale>0) Zoff-=(y0 - y1)*focale/400;
-            else { const float s = std::exp((y0 - y1)/400.0f); pose*=s; sprite_scale*=s; }
-            x0 = x1; y0 = y1;
-          }
-          if (disp.wheel()) {
-            if (focale>0) Zoff-=disp.wheel()*focale/20;
-            else { const float s = std::exp(disp.wheel()/20.0f); pose*=s; sprite_scale*=s; }
-            disp.set_wheel();
-          }
-          if (disp.button()&4) { Xoff+=(x1 - x0); Yoff+=(y1 - y0); x0 = x1; y0 = y1; }
-          if ((disp.button()&1) && (disp.button()&2)) {
-            init_pose = true; disp.set_button(); x0 = x1; y0 = y1;
-            pose = CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0);
-          }
-        } else if (clicked) { x0 = x1; y0 = y1; clicked = false; redraw = true; }
-
-        CImg<charT> filename(32);
-        switch (key = disp.key()) {
-#if cimg_OS!=2
-        case cimg::keyCTRLRIGHT :
-#endif
-        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
-        case cimg::keyD: if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
-                     CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
-              _is_resized = true;
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).resize(cimg_fitscreen(_width,_height,_depth),false)._is_resized = true;
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            if (!ns_width || !ns_height ||
-                ns_width>(unsigned int)disp.screen_width() || ns_height>(unsigned int)disp.screen_height()) {
-              ns_width = disp.screen_width()*3U/4;
-              ns_height = disp.screen_height()*3U/4;
-            }
-            if (disp.is_fullscreen()) disp.resize(ns_width,ns_height,false);
-            else {
-              ns_width = disp._width; ns_height = disp._height;
-              disp.resize(disp.screen_width(),disp.screen_height(),false);
-            }
-            disp.toggle_fullscreen()._is_resized = true;
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyT : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            // Switch single/double-sided primitives.
-            if (--_is_double_sided==-2) _is_double_sided = 1;
-            if (_is_double_sided>=0) reverse_primitives.assign();
-            else primitives.get_reverse_object3d().move_to(reverse_primitives);
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyZ : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Enable/disable Z-buffer
-            if (zbuffer) zbuffer.assign();
-            else zbuffer.assign(visu0.width(),visu0.height(),1,1,0);
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyA : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Show/hide 3d axes.
-            ndisplay_axes = !ndisplay_axes;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF1 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to points.
-            nrender_motion = (nrender_static==0 && nrender_motion!=0)?0:-1; nrender_static = 0;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF2 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to lines.
-            nrender_motion = (nrender_static==1 && nrender_motion!=1)?1:-1; nrender_static = 1;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF3 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to flat.
-            nrender_motion = (nrender_static==2 && nrender_motion!=2)?2:-1; nrender_static = 2;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF4 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to flat-shaded.
-            nrender_motion = (nrender_static==3 && nrender_motion!=3)?3:-1; nrender_static = 3;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF5 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            // Set rendering mode to gouraud-shaded.
-            nrender_motion = (nrender_static==4 && nrender_motion!=4)?4:-1; nrender_static = 4;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyF6 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to phong-shaded.
-            nrender_motion = (nrender_static==5 && nrender_motion!=5)?5:-1; nrender_static = 5;
-            disp.set_key(key,false); key = 0; redraw = true;
-          } break;
-        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save snapshot
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.bmp",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu).draw_text(0,0," Saving snapshot... ",
-                              foreground_color._data,background_color._data,0.7f,13).display(disp);
-            visu.save(filename);
-            (+visu).draw_text(0,0," Snapshot '%s' saved. ",
-                              foreground_color._data,background_color._data,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyG : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .off file
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.off",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu).draw_text(0,0," Saving object... ",
-                              foreground_color._data,background_color._data,0.7f,13).display(disp);
-            vertices.save_off(reverse_primitives?reverse_primitives:primitives,colors,filename);
-            (+visu).draw_text(0,0," Object '%s' saved. ",
-                              foreground_color._data,background_color._data,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyO : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .cimg file
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-#ifdef cimg_use_zlib
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimgz",snap_number++);
-#else
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimg",snap_number++);
-#endif
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu).draw_text(0,0," Saving object... ",
-                              foreground_color._data,background_color._data,0.7f,13).display(disp);
-            vertices.get_object3dtoCImg3d(reverse_primitives?reverse_primitives:primitives,colors,opacities).
-              save(filename);
-            (+visu).draw_text(0,0," Object '%s' saved. ",
-                              foreground_color._data,background_color._data,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-#ifdef cimg_use_board
-        case cimg::keyP : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .EPS file
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.eps",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu).draw_text(0,0," Saving EPS snapshot... ",
-                              foreground_color._data,background_color._data,0.7f,13).display(disp);
-            LibBoard::Board board;
-            (+visu)._draw_object3d(&board,zbuffer.fill(0),
-                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
-                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
-                                   colors,opacities,clicked?nrender_motion:nrender_static,
-                                   _is_double_sided==1,focale,
-                                   visu.width()/2.0f + light_x,visu.height()/2.0f + light_y,light_z + Zoff,
-                                   specular_lightness,specular_shininess,
-                                   sprite_scale);
-            board.saveEPS(filename);
-            (+visu).draw_text(0,0," Object '%s' saved. ",
-                              foreground_color._data,background_color._data,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-        case cimg::keyV : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .SVG file
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.svg",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu).draw_text(0,0," Saving SVG snapshot... ",
-                              foreground_color._data,background_color._data,0.7f,13).display(disp);
-            LibBoard::Board board;
-            (+visu)._draw_object3d(&board,zbuffer.fill(0),
-                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
-                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
-                                   colors,opacities,clicked?nrender_motion:nrender_static,
-                                   _is_double_sided==1,focale,
-                                   visu.width()/2.0f + light_x,visu.height()/2.0f + light_y,light_z + Zoff,
-                                   specular_lightness,specular_shininess,
-                                   sprite_scale);
-            board.saveSVG(filename);
-            (+visu).draw_text(0,0," Object '%s' saved. ",
-                              foreground_color._data,background_color._data,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false); key = 0;
-          } break;
-#endif
-        }
-        if (disp.is_resized()) {
-          disp.resize(false); visu0 = get_resize(disp,1);
-          if (zbuffer) zbuffer.assign(disp.width(),disp.height());
-          redraw = true;
-        }
-        if (!exit_on_anykey && key && key!=cimg::keyESC &&
-            (key!=cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          key = 0;
-        }
-      }
-      if (pose_matrix) {
-        std::memcpy(pose_matrix,pose._data,12*sizeof(float));
-        pose_matrix[12] = Xoff; pose_matrix[13] = Yoff; pose_matrix[14] = Zoff; pose_matrix[15] = sprite_scale;
-      }
-      disp.set_button().set_key(key);
-      return *this;
-    }
-
-    //! Display 1d graph in an interactive window.
-    /**
-       \param disp Display window.
-       \param plot_type Plot type. Can be <tt>{ 0=points | 1=segments | 2=splines | 3=bars }</tt>.
-       \param vertex_type Vertex type.
-       \param labelx Title for the horizontal axis, as a C-string.
-       \param xmin Minimum value along the X-axis.
-       \param xmax Maximum value along the X-axis.
-       \param labely Title for the vertical axis, as a C-string.
-       \param ymin Minimum value along the X-axis.
-       \param ymax Maximum value along the X-axis.
-    **/
-    const CImg<T>& display_graph(CImgDisplay &disp,
-                                 const unsigned int plot_type=1, const unsigned int vertex_type=1,
-                                 const char *const labelx=0, const double xmin=0, const double xmax=0,
-                                 const char *const labely=0, const double ymin=0, const double ymax=0,
-                                 const bool exit_on_anykey=false) const {
-      return _display_graph(disp,0,plot_type,vertex_type,labelx,xmin,xmax,labely,ymin,ymax,exit_on_anykey);
-    }
-
-    //! Display 1d graph in an interactive window \overloading.
-    const CImg<T>& display_graph(const char *const title=0,
-                                 const unsigned int plot_type=1, const unsigned int vertex_type=1,
-                                 const char *const labelx=0, const double xmin=0, const double xmax=0,
-                                 const char *const labely=0, const double ymin=0, const double ymax=0,
-                                 const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      return _display_graph(disp,title,plot_type,vertex_type,labelx,xmin,xmax,labely,ymin,ymax,exit_on_anykey);
-    }
-
-    const CImg<T>& _display_graph(CImgDisplay &disp, const char *const title=0,
-                                  const unsigned int plot_type=1, const unsigned int vertex_type=1,
-                                  const char *const labelx=0, const double xmin=0, const double xmax=0,
-                                  const char *const labely=0, const double ymin=0, const double ymax=0,
-                                  const bool exit_on_anykey=false) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "display_graph(): Empty instance.",
-                                    cimg_instance);
-      if (!disp) disp.assign(cimg_fitscreen(CImgDisplay::screen_width()/2,CImgDisplay::screen_height()/2,1),0,0).
-                   set_title(title?"%s":"CImg<%s>",title?title:pixel_type());
-      const ulongT siz = (ulongT)_width*_height*_depth, siz1 = std::max((ulongT)1,siz - 1);
-      const unsigned int old_normalization = disp.normalization();
-      disp.show().flush()._normalization = 0;
-
-      double y0 = ymin, y1 = ymax, nxmin = xmin, nxmax = xmax;
-      if (nxmin==nxmax) { nxmin = 0; nxmax = siz1; }
-      int x0 = 0, x1 = width()*height()*depth() - 1, key = 0;
-
-      for (bool reset_view = true; !key && !disp.is_closed(); ) {
-        if (reset_view) { x0 = 0; x1 = width()*height()*depth() - 1; y0 = ymin; y1 = ymax; reset_view = false; }
-        CImg<T> zoom(x1 - x0 + 1,1,1,spectrum());
-        cimg_forC(*this,c) zoom.get_shared_channel(c) = CImg<T>(data(x0,0,0,c),x1 - x0 + 1,1,1,1,true);
-        if (y0==y1) { y0 = zoom.min_max(y1); const double dy = y1 - y0; y0-=dy/20; y1+=dy/20; }
-        if (y0==y1) { --y0; ++y1; }
-
-        const CImg<intT> selection = zoom.get_select_graph(disp,plot_type,vertex_type,
-                                                           labelx,
-                                                           nxmin + x0*(nxmax - nxmin)/siz1,
-                                                           nxmin + x1*(nxmax - nxmin)/siz1,
-                                                           labely,y0,y1,true);
-        const int mouse_x = disp.mouse_x(), mouse_y = disp.mouse_y();
-        if (selection[0]>=0) {
-          if (selection[2]<0) reset_view = true;
-          else {
-            x1 = x0 + selection[2]; x0+=selection[0];
-            if (selection[1]>=0 && selection[3]>=0) {
-              y0 = y1 - selection[3]*(y1 - y0)/(disp.height() - 32);
-              y1-=selection[1]*(y1 - y0)/(disp.height() - 32);
-            }
-          }
-        } else {
-          bool go_in = false, go_out = false, go_left = false, go_right = false, go_up = false, go_down = false;
-          switch (key = (int)disp.key()) {
-          case cimg::keyHOME : reset_view = true; key = 0; disp.set_key(); break;
-          case cimg::keyPADADD : go_in = true; go_out = false; key = 0; disp.set_key(); break;
-          case cimg::keyPADSUB : go_out = true; go_in = false; key = 0; disp.set_key(); break;
-          case cimg::keyARROWLEFT : case cimg::keyPAD4 : go_left = true; go_right = false; key = 0; disp.set_key();
-            break;
-          case cimg::keyARROWRIGHT : case cimg::keyPAD6 : go_right = true; go_left = false; key = 0; disp.set_key();
-            break;
-          case cimg::keyARROWUP : case cimg::keyPAD8 : go_up = true; go_down = false; key = 0; disp.set_key(); break;
-          case cimg::keyARROWDOWN : case cimg::keyPAD2 : go_down = true; go_up = false; key = 0; disp.set_key(); break;
-          case cimg::keyPAD7 : go_left = true; go_up = true; key = 0; disp.set_key(); break;
-          case cimg::keyPAD9 : go_right = true; go_up = true; key = 0; disp.set_key(); break;
-          case cimg::keyPAD1 : go_left = true; go_down = true; key = 0; disp.set_key(); break;
-          case cimg::keyPAD3 : go_right = true; go_down = true; key = 0; disp.set_key(); break;
-          }
-          if (disp.wheel()) {
-            if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) go_up = !(go_down = disp.wheel()<0);
-            else if (disp.is_keySHIFTLEFT() || disp.is_keySHIFTRIGHT()) go_left = !(go_right = disp.wheel()>0);
-            else go_out = !(go_in = disp.wheel()>0);
-            key = 0;
-          }
-
-          if (go_in) {
-            const int
-              xsiz = x1 - x0,
-              mx = (mouse_x - 16)*xsiz/(disp.width() - 32),
-              cx = x0 + cimg::cut(mx,0,xsiz);
-            if (x1 - x0>4) {
-              x0 = cx - 7*(cx - x0)/8; x1 = cx + 7*(x1 - cx)/8;
-              if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-                const double
-                  ysiz = y1 - y0,
-                  my = (mouse_y - 16)*ysiz/(disp.height() - 32),
-                  cy = y1 - cimg::cut(my,0.0,ysiz);
-                y0 = cy - 7*(cy - y0)/8; y1 = cy + 7*(y1 - cy)/8;
-              } else y0 = y1 = 0;
-            }
-          }
-          if (go_out) {
-            if (x0>0 || x1<(int)siz1) {
-              const int delta_x = (x1 - x0)/8, ndelta_x = delta_x?delta_x:(siz>1);
-              const double ndelta_y = (y1 - y0)/8;
-              x0-=ndelta_x; x1+=ndelta_x;
-              y0-=ndelta_y; y1+=ndelta_y;
-              if (x0<0) { x1-=x0; x0 = 0; if (x1>=(int)siz) x1 = (int)siz1; }
-              if (x1>=(int)siz) { x0-=(x1 - siz1); x1 = (int)siz1; if (x0<0) x0 = 0; }
-            }
-          }
-          if (go_left) {
-            const int delta = (x1 - x0)/5, ndelta = delta?delta:1;
-            if (x0 - ndelta>=0) { x0-=ndelta; x1-=ndelta; }
-            else { x1-=x0; x0 = 0; }
-            go_left = false;
-          }
-          if (go_right) {
-            const int delta = (x1 - x0)/5, ndelta = delta?delta:1;
-            if (x1 + ndelta<(int)siz) { x0+=ndelta; x1+=ndelta; }
-            else { x0+=(siz1 - x1); x1 = (int)siz1; }
-            go_right = false;
-          }
-          if (go_up) {
-            const double delta = (y1 - y0)/10, ndelta = delta?delta:1;
-            y0+=ndelta; y1+=ndelta;
-            go_up = false;
-          }
-          if (go_down) {
-            const double delta = (y1 - y0)/10, ndelta = delta?delta:1;
-            y0-=ndelta; y1-=ndelta;
-            go_down = false;
-          }
-        }
-        if (!exit_on_anykey && key && key!=(int)cimg::keyESC &&
-            (key!=(int)cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          disp.set_key(key,false);
-          key = 0;
-        }
-      }
-      disp._normalization = old_normalization;
-      return *this;
-    }
-
-    //! Save image as a file.
-    /**
-       \param filename Filename, as a C-string.
-       \param number When positive, represents an index added to the filename. Otherwise, no number is added.
-       \param digits Number of digits used for adding the number to the filename.
-       \note
-       - The used file format is defined by the file extension in the filename \p filename.
-       - Parameter \p number can be used to add a 6-digit number to the filename before saving.
-
-    **/
-    const CImg<T>& save(const char *const filename, const int number=-1, const unsigned int digits=6) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save(): Specified filename is (null).",
-                                    cimg_instance);
-      // Do not test for empty instances, since .cimg format is able to manage empty instances.
-      const bool is_stdout = *filename=='-' && (!filename[1] || filename[1]=='.');
-      const char *const ext = cimg::split_filename(filename);
-      CImg<charT> nfilename(1024);
-      const char *const fn = is_stdout?filename:(number>=0)?cimg::number_filename(filename,number,digits,nfilename):
-        filename;
-
-#ifdef cimg_save_plugin
-      cimg_save_plugin(fn);
-#endif
-#ifdef cimg_save_plugin1
-      cimg_save_plugin1(fn);
-#endif
-#ifdef cimg_save_plugin2
-      cimg_save_plugin2(fn);
-#endif
-#ifdef cimg_save_plugin3
-      cimg_save_plugin3(fn);
-#endif
-#ifdef cimg_save_plugin4
-      cimg_save_plugin4(fn);
-#endif
-#ifdef cimg_save_plugin5
-      cimg_save_plugin5(fn);
-#endif
-#ifdef cimg_save_plugin6
-      cimg_save_plugin6(fn);
-#endif
-#ifdef cimg_save_plugin7
-      cimg_save_plugin7(fn);
-#endif
-#ifdef cimg_save_plugin8
-      cimg_save_plugin8(fn);
-#endif
-      // Ascii formats
-      if (!cimg::strcasecmp(ext,"asc")) return save_ascii(fn);
-      else if (!cimg::strcasecmp(ext,"dlm") ||
-               !cimg::strcasecmp(ext,"txt")) return save_dlm(fn);
-      else if (!cimg::strcasecmp(ext,"cpp") ||
-               !cimg::strcasecmp(ext,"hpp") ||
-               !cimg::strcasecmp(ext,"h") ||
-               !cimg::strcasecmp(ext,"c")) return save_cpp(fn);
-
-      // 2d binary formats
-      else if (!cimg::strcasecmp(ext,"bmp")) return save_bmp(fn);
-      else if (!cimg::strcasecmp(ext,"jpg") ||
-               !cimg::strcasecmp(ext,"jpeg") ||
-               !cimg::strcasecmp(ext,"jpe") ||
-               !cimg::strcasecmp(ext,"jfif") ||
-               !cimg::strcasecmp(ext,"jif")) return save_jpeg(fn);
-      else if (!cimg::strcasecmp(ext,"rgb")) return save_rgb(fn);
-      else if (!cimg::strcasecmp(ext,"rgba")) return save_rgba(fn);
-      else if (!cimg::strcasecmp(ext,"png")) return save_png(fn);
-      else if (!cimg::strcasecmp(ext,"pgm") ||
-               !cimg::strcasecmp(ext,"ppm") ||
-               !cimg::strcasecmp(ext,"pnm")) return save_pnm(fn);
-      else if (!cimg::strcasecmp(ext,"pnk")) return save_pnk(fn);
-      else if (!cimg::strcasecmp(ext,"pfm")) return save_pfm(fn);
-      else if (!cimg::strcasecmp(ext,"exr")) return save_exr(fn);
-      else if (!cimg::strcasecmp(ext,"tif") ||
-               !cimg::strcasecmp(ext,"tiff")) return save_tiff(fn);
-
-      // 3d binary formats
-      else if (!cimg::strcasecmp(ext,"cimgz")) return save_cimg(fn,true);
-      else if (!cimg::strcasecmp(ext,"cimg") || !*ext) return save_cimg(fn,false);
-      else if (!cimg::strcasecmp(ext,"dcm")) return save_medcon_external(fn);
-      else if (!cimg::strcasecmp(ext,"hdr") ||
-               !cimg::strcasecmp(ext,"nii")) return save_analyze(fn);
-      else if (!cimg::strcasecmp(ext,"inr")) return save_inr(fn);
-      else if (!cimg::strcasecmp(ext,"mnc")) return save_minc2(fn);
-      else if (!cimg::strcasecmp(ext,"pan")) return save_pandore(fn);
-      else if (!cimg::strcasecmp(ext,"raw")) return save_raw(fn);
-
-      // Archive files
-      else if (!cimg::strcasecmp(ext,"gz")) return save_gzip_external(fn);
-
-      // Image sequences
-      else if (!cimg::strcasecmp(ext,"yuv")) return save_yuv(fn,true);
-      else if (!cimg::strcasecmp(ext,"avi") ||
-               !cimg::strcasecmp(ext,"mov") ||
-               !cimg::strcasecmp(ext,"asf") ||
-               !cimg::strcasecmp(ext,"divx") ||
-               !cimg::strcasecmp(ext,"flv") ||
-               !cimg::strcasecmp(ext,"mpg") ||
-               !cimg::strcasecmp(ext,"m1v") ||
-               !cimg::strcasecmp(ext,"m2v") ||
-               !cimg::strcasecmp(ext,"m4v") ||
-               !cimg::strcasecmp(ext,"mjp") ||
-               !cimg::strcasecmp(ext,"mp4") ||
-               !cimg::strcasecmp(ext,"mkv") ||
-               !cimg::strcasecmp(ext,"mpe") ||
-               !cimg::strcasecmp(ext,"movie") ||
-               !cimg::strcasecmp(ext,"ogm") ||
-               !cimg::strcasecmp(ext,"ogg") ||
-               !cimg::strcasecmp(ext,"ogv") ||
-               !cimg::strcasecmp(ext,"qt") ||
-               !cimg::strcasecmp(ext,"rm") ||
-               !cimg::strcasecmp(ext,"vob") ||
-               !cimg::strcasecmp(ext,"wmv") ||
-               !cimg::strcasecmp(ext,"xvid") ||
-               !cimg::strcasecmp(ext,"mpeg")) return save_video(fn);
-      return save_other(fn);
-    }
-
-    //! Save image as an ascii file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_ascii(const char *const filename) const {
-      return _save_ascii(0,filename);
-    }
-
-    //! Save image as an ascii file \overloading.
-    const CImg<T>& save_ascii(std::FILE *const file) const {
-      return _save_ascii(file,0);
-    }
-
-    const CImg<T>& _save_ascii(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_ascii(): Specified filename is (null).",
-                                    cimg_instance);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
-      std::fprintf(nfile,"%u %u %u %u\n",_width,_height,_depth,_spectrum);
-      const T* ptrs = _data;
-      cimg_forYZC(*this,y,z,c) {
-        cimg_forX(*this,x) std::fprintf(nfile,"%.17g ",(double)*(ptrs++));
-        std::fputc('\n',nfile);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a .cpp source file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_cpp(const char *const filename) const {
-      return _save_cpp(0,filename);
-    }
-
-    //! Save image as a .cpp source file \overloading.
-    const CImg<T>& save_cpp(std::FILE *const file) const {
-      return _save_cpp(file,0);
-    }
-
-    const CImg<T>& _save_cpp(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_cpp(): Specified filename is (null).",
-                                    cimg_instance);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
-      CImg<charT> varname(1024); *varname = 0;
-      if (filename) cimg_sscanf(cimg::basename(filename),"%1023[a-zA-Z0-9_]",varname._data);
-      if (!*varname) cimg_snprintf(varname,varname._width,"unnamed");
-      std::fprintf(nfile,
-                   "/* Define image '%s' of size %ux%ux%ux%u and type '%s' */\n"
-                   "%s data_%s[] = { %s\n  ",
-                   varname._data,_width,_height,_depth,_spectrum,pixel_type(),pixel_type(),varname._data,
-                   is_empty()?"};":"");
-      if (!is_empty()) for (ulongT off = 0, siz = size() - 1; off<=siz; ++off) {
-        std::fprintf(nfile,cimg::type<T>::format(),cimg::type<T>::format((*this)[off]));
-        if (off==siz) std::fprintf(nfile," };\n");
-        else if (!((off + 1)%16)) std::fprintf(nfile,",\n  ");
-        else std::fprintf(nfile,", ");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a DLM file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_dlm(const char *const filename) const {
-      return _save_dlm(0,filename);
-    }
-
-    //! Save image as a DLM file \overloading.
-    const CImg<T>& save_dlm(std::FILE *const file) const {
-      return _save_dlm(file,0);
-    }
-
-    const CImg<T>& _save_dlm(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_dlm(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_dlm(): Instance is volumetric, values along Z will be unrolled in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-      if (_spectrum>1)
-        cimg::warn(_cimg_instance
-                   "save_dlm(): Instance is multispectral, values along C will be unrolled in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
-      const T* ptrs = _data;
-      cimg_forYZC(*this,y,z,c) {
-        cimg_forX(*this,x) std::fprintf(nfile,"%.17g%s",(double)*(ptrs++),(x==width() - 1)?"":",");
-        std::fputc('\n',nfile);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a BMP file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_bmp(const char *const filename) const {
-      return _save_bmp(0,filename);
-    }
-
-    //! Save image as a BMP file \overloading.
-    const CImg<T>& save_bmp(std::FILE *const file) const {
-      return _save_bmp(file,0);
-    }
-
-    const CImg<T>& _save_bmp(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_bmp(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_bmp(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-      if (_spectrum>3)
-        cimg::warn(_cimg_instance
-                   "save_bmp(): Instance is multispectral, only the three first channels will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      CImg<ucharT> header(54,1,1,1,0);
-      unsigned char align_buf[4] = { 0 };
-      const unsigned int
-        align = (4 - (3*_width)%4)%4,
-        buf_size = (3*_width + align)*height(),
-        file_size = 54 + buf_size;
-      header[0] = 'B'; header[1] = 'M';
-      header[0x02] = file_size&0xFF;
-      header[0x03] = (file_size>>8)&0xFF;
-      header[0x04] = (file_size>>16)&0xFF;
-      header[0x05] = (file_size>>24)&0xFF;
-      header[0x0A] = 0x36;
-      header[0x0E] = 0x28;
-      header[0x12] = _width&0xFF;
-      header[0x13] = (_width>>8)&0xFF;
-      header[0x14] = (_width>>16)&0xFF;
-      header[0x15] = (_width>>24)&0xFF;
-      header[0x16] = _height&0xFF;
-      header[0x17] = (_height>>8)&0xFF;
-      header[0x18] = (_height>>16)&0xFF;
-      header[0x19] = (_height>>24)&0xFF;
-      header[0x1A] = 1;
-      header[0x1B] = 0;
-      header[0x1C] = 24;
-      header[0x1D] = 0;
-      header[0x22] = buf_size&0xFF;
-      header[0x23] = (buf_size>>8)&0xFF;
-      header[0x24] = (buf_size>>16)&0xFF;
-      header[0x25] = (buf_size>>24)&0xFF;
-      header[0x27] = 0x1;
-      header[0x2B] = 0x1;
-      cimg::fwrite(header._data,54,nfile);
-
-      const T
-        *ptr_r = data(0,_height - 1,0,0),
-        *ptr_g = (_spectrum>=2)?data(0,_height - 1,0,1):0,
-        *ptr_b = (_spectrum>=3)?data(0,_height - 1,0,2):0;
-
-      switch (_spectrum) {
-      case 1 : {
-        cimg_forY(*this,y) {
-          cimg_forX(*this,x) {
-            const unsigned char val = (unsigned char)*(ptr_r++);
-            std::fputc(val,nfile); std::fputc(val,nfile); std::fputc(val,nfile);
-          }
-          cimg::fwrite(align_buf,align,nfile);
-          ptr_r-=2*_width;
-        }
-      } break;
-      case 2 : {
-        cimg_forY(*this,y) {
-          cimg_forX(*this,x) {
-            std::fputc(0,nfile);
-            std::fputc((unsigned char)(*(ptr_g++)),nfile);
-            std::fputc((unsigned char)(*(ptr_r++)),nfile);
-          }
-          cimg::fwrite(align_buf,align,nfile);
-          ptr_r-=2*_width; ptr_g-=2*_width;
-        }
-      } break;
-      default : {
-        cimg_forY(*this,y) {
-          cimg_forX(*this,x) {
-            std::fputc((unsigned char)(*(ptr_b++)),nfile);
-            std::fputc((unsigned char)(*(ptr_g++)),nfile);
-            std::fputc((unsigned char)(*(ptr_r++)),nfile);
-          }
-          cimg::fwrite(align_buf,align,nfile);
-          ptr_r-=2*_width; ptr_g-=2*_width; ptr_b-=2*_width;
-        }
-      }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a JPEG file.
-    /**
-      \param filename Filename, as a C-string.
-      \param quality Image quality (in %)
-    **/
-    const CImg<T>& save_jpeg(const char *const filename, const unsigned int quality=100) const {
-      return _save_jpeg(0,filename,quality);
-    }
-
-    //! Save image as a JPEG file \overloading.
-    const CImg<T>& save_jpeg(std::FILE *const file, const unsigned int quality=100) const {
-      return _save_jpeg(file,0,quality);
-    }
-
-    const CImg<T>& _save_jpeg(std::FILE *const file, const char *const filename, const unsigned int quality) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_jpeg(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_jpeg(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-#ifndef cimg_use_jpeg
-      if (!file) return save_other(filename,quality);
-      else throw CImgIOException(_cimg_instance
-                                 "save_jpeg(): Unable to save data in '(*FILE)' unless libjpeg is enabled.",
-                                 cimg_instance);
-#else
-      unsigned int dimbuf = 0;
-      J_COLOR_SPACE colortype = JCS_RGB;
-
-      switch (_spectrum) {
-      case 1 : dimbuf = 1; colortype = JCS_GRAYSCALE; break;
-      case 2 : dimbuf = 3; colortype = JCS_RGB; break;
-      case 3 : dimbuf = 3; colortype = JCS_RGB; break;
-      default : dimbuf = 4; colortype = JCS_CMYK; break;
-      }
-
-      // Call libjpeg functions
-      struct jpeg_compress_struct cinfo;
-      struct jpeg_error_mgr jerr;
-      cinfo.err = jpeg_std_error(&jerr);
-      jpeg_create_compress(&cinfo);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      jpeg_stdio_dest(&cinfo,nfile);
-      cinfo.image_width = _width;
-      cinfo.image_height = _height;
-      cinfo.input_components = dimbuf;
-      cinfo.in_color_space = colortype;
-      jpeg_set_defaults(&cinfo);
-      jpeg_set_quality(&cinfo,quality<100?quality:100,TRUE);
-      jpeg_start_compress(&cinfo,TRUE);
-
-      JSAMPROW row_pointer[1];
-      CImg<ucharT> buffer(_width*dimbuf);
-
-      while (cinfo.next_scanline<cinfo.image_height) {
-        unsigned char *ptrd = buffer._data;
-
-        // Fill pixel buffer
-        switch (_spectrum) {
-        case 1 : { // Greyscale images
-          const T *ptr_g = data(0, cinfo.next_scanline);
-          for (unsigned int b = 0; b<cinfo.image_width; b++)
-            *(ptrd++) = (unsigned char)*(ptr_g++);
-        } break;
-        case 2 : { // RG images
-          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
-            *ptr_g = data(0,cinfo.next_scanline,0,1);
-          for (unsigned int b = 0; b<cinfo.image_width; ++b) {
-            *(ptrd++) = (unsigned char)*(ptr_r++);
-            *(ptrd++) = (unsigned char)*(ptr_g++);
-            *(ptrd++) = 0;
-          }
-        } break;
-        case 3 : { // RGB images
-          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
-            *ptr_g = data(0,cinfo.next_scanline,0,1),
-            *ptr_b = data(0,cinfo.next_scanline,0,2);
-          for (unsigned int b = 0; b<cinfo.image_width; ++b) {
-            *(ptrd++) = (unsigned char)*(ptr_r++);
-            *(ptrd++) = (unsigned char)*(ptr_g++);
-            *(ptrd++) = (unsigned char)*(ptr_b++);
-          }
-        } break;
-        default : { // CMYK images
-          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
-            *ptr_g = data(0,cinfo.next_scanline,0,1),
-            *ptr_b = data(0,cinfo.next_scanline,0,2),
-            *ptr_a = data(0,cinfo.next_scanline,0,3);
-          for (unsigned int b = 0; b<cinfo.image_width; ++b) {
-            *(ptrd++) = (unsigned char)*(ptr_r++);
-            *(ptrd++) = (unsigned char)*(ptr_g++);
-            *(ptrd++) = (unsigned char)*(ptr_b++);
-            *(ptrd++) = (unsigned char)*(ptr_a++);
-          }
-        }
-        }
-        *row_pointer = buffer._data;
-        jpeg_write_scanlines(&cinfo,row_pointer,1);
-      }
-      jpeg_finish_compress(&cinfo);
-      if (!file) cimg::fclose(nfile);
-      jpeg_destroy_compress(&cinfo);
-      return *this;
-#endif
-    }
-
-    //! Save image, using built-in ImageMagick++ library.
-    /**
-      \param filename Filename, as a C-string.
-      \param bytes_per_pixel Force the number of bytes per pixel for the saving, when possible.
-    **/
-    const CImg<T>& save_magick(const char *const filename, const unsigned int bytes_per_pixel=0) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_magick(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-#ifdef cimg_use_magick
-      double stmin, stmax = (double)max_min(stmin);
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_magick(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename);
-
-      if (_spectrum>3)
-        cimg::warn(_cimg_instance
-                   "save_magick(): Instance is multispectral, only the three first channels will be "
-                   "saved in file '%s'.",
-                   cimg_instance,
-                   filename);
-
-      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
-        cimg::warn(_cimg_instance
-                   "save_magick(): Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
-                   cimg_instance,
-                   filename,stmin,stmax);
-
-      Magick::Image image(Magick::Geometry(_width,_height),"black");
-      image.type(Magick::TrueColorType);
-      image.depth(bytes_per_pixel?(8*bytes_per_pixel):(stmax>=256?16:8));
-      const T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = _spectrum>1?data(0,0,0,1):0,
-        *ptr_b = _spectrum>2?data(0,0,0,2):0;
-      Magick::PixelPacket *pixels = image.getPixels(0,0,_width,_height);
-      switch (_spectrum) {
-      case 1 : // Scalar images
-        for (ulongT off = (ulongT)_width*_height; off; --off) {
-          pixels->red = pixels->green = pixels->blue = (Magick::Quantum)*(ptr_r++);
-          ++pixels;
-        }
-        break;
-      case 2 : // RG images
-        for (ulongT off = (ulongT)_width*_height; off; --off) {
-          pixels->red = (Magick::Quantum)*(ptr_r++);
-          pixels->green = (Magick::Quantum)*(ptr_g++);
-          pixels->blue = 0; ++pixels;
-        }
-        break;
-      default : // RGB images
-        for (ulongT off = (ulongT)_width*_height; off; --off) {
-          pixels->red = (Magick::Quantum)*(ptr_r++);
-          pixels->green = (Magick::Quantum)*(ptr_g++);
-          pixels->blue = (Magick::Quantum)*(ptr_b++);
-          ++pixels;
-        }
-      }
-      image.syncPixels();
-      image.write(filename);
-      return *this;
-#else
-      cimg::unused(bytes_per_pixel);
-      throw CImgIOException(_cimg_instance
-                            "save_magick(): Unable to save file '%s' unless libMagick++ is enabled.",
-                            cimg_instance,
-                            filename);
-#endif
-    }
-
-    //! Save image as a PNG file.
-    /**
-       \param filename Filename, as a C-string.
-       \param bytes_per_pixel Force the number of bytes per pixels for the saving, when possible.
-    **/
-    const CImg<T>& save_png(const char *const filename, const unsigned int bytes_per_pixel=0) const {
-      return _save_png(0,filename,bytes_per_pixel);
-    }
-
-    //! Save image as a PNG file \overloading.
-    const CImg<T>& save_png(std::FILE *const file, const unsigned int bytes_per_pixel=0) const {
-      return _save_png(file,0,bytes_per_pixel);
-    }
-
-    const CImg<T>& _save_png(std::FILE *const file, const char *const filename,
-                             const unsigned int bytes_per_pixel=0) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_png(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-
-#ifndef cimg_use_png
-      cimg::unused(bytes_per_pixel);
-      if (!file) return save_other(filename);
-      else throw CImgIOException(_cimg_instance
-                                 "save_png(): Unable to save data in '(*FILE)' unless libpng is enabled.",
-                                 cimg_instance);
-#else
-
-#if defined __GNUC__
-      const char *volatile nfilename = filename; // Use 'volatile' to avoid (wrong) g++ warning.
-      std::FILE *volatile nfile = file?file:cimg::fopen(nfilename,"wb");
-      volatile double stmin, stmax = (double)max_min(stmin);
-#else
-      const char *nfilename = filename;
-      std::FILE *nfile = file?file:cimg::fopen(nfilename,"wb");
-      double stmin, stmax = (double)max_min(stmin);
-#endif
-
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_png(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename);
-
-      if (_spectrum>4)
-        cimg::warn(_cimg_instance
-                   "save_png(): Instance is multispectral, only the three first channels will be saved in file '%s'.",
-                   cimg_instance,
-                   filename);
-
-      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
-        cimg::warn(_cimg_instance
-                   "save_png(): Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
-                   cimg_instance,
-                   filename,stmin,stmax);
-
-      // Setup PNG structures for write
-      png_voidp user_error_ptr = 0;
-      png_error_ptr user_error_fn = 0, user_warning_fn = 0;
-      png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,user_error_ptr, user_error_fn,
-                                                    user_warning_fn);
-      if (!png_ptr){
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "save_png(): Failed to initialize 'png_ptr' structure when saving file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_infop info_ptr = png_create_info_struct(png_ptr);
-      if (!info_ptr) {
-        png_destroy_write_struct(&png_ptr,(png_infopp)0);
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "save_png(): Failed to initialize 'info_ptr' structure when saving file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      if (setjmp(png_jmpbuf(png_ptr))) {
-        png_destroy_write_struct(&png_ptr, &info_ptr);
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "save_png(): Encountered unknown fatal error in libpng when saving file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_init_io(png_ptr, nfile);
-
-      const int bit_depth = bytes_per_pixel?(bytes_per_pixel*8):(stmax>=256?16:8);
-
-      int color_type;
-      switch (spectrum()) {
-      case 1 : color_type = PNG_COLOR_TYPE_GRAY; break;
-      case 2 : color_type = PNG_COLOR_TYPE_GRAY_ALPHA; break;
-      case 3 : color_type = PNG_COLOR_TYPE_RGB; break;
-      default : color_type = PNG_COLOR_TYPE_RGB_ALPHA;
-      }
-      const int interlace_type = PNG_INTERLACE_NONE;
-      const int compression_type = PNG_COMPRESSION_TYPE_DEFAULT;
-      const int filter_method = PNG_FILTER_TYPE_DEFAULT;
-      png_set_IHDR(png_ptr,info_ptr,_width,_height,bit_depth,color_type,interlace_type,compression_type,filter_method);
-      png_write_info(png_ptr,info_ptr);
-      const int byte_depth = bit_depth>>3;
-      const int numChan = spectrum()>4?4:spectrum();
-      const int pixel_bit_depth_flag = numChan * (bit_depth - 1);
-
-      // Allocate Memory for Image Save and Fill pixel data
-      png_bytep *const imgData = new png_byte*[_height];
-      for (unsigned int row = 0; row<_height; ++row) imgData[row] = new png_byte[byte_depth*numChan*_width];
-      const T *pC0 = data(0,0,0,0);
-      switch (pixel_bit_depth_flag) {
-      case 7 :  { // Gray 8-bit
-        cimg_forY(*this,y) {
-          unsigned char *ptrd = imgData[y];
-          cimg_forX(*this,x) *(ptrd++) = (unsigned char)*(pC0++);
-        }
-      } break;
-      case 14 : { // Gray w/ Alpha 8-bit
-        const T *pC1 = data(0,0,0,1);
-        cimg_forY(*this,y) {
-          unsigned char *ptrd = imgData[y];
-          cimg_forX(*this,x) {
-            *(ptrd++) = (unsigned char)*(pC0++);
-            *(ptrd++) = (unsigned char)*(pC1++);
-          }
-        }
-      } break;
-      case 21 :  { // RGB 8-bit
-        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2);
-        cimg_forY(*this,y) {
-          unsigned char *ptrd = imgData[y];
-          cimg_forX(*this,x) {
-            *(ptrd++) = (unsigned char)*(pC0++);
-            *(ptrd++) = (unsigned char)*(pC1++);
-            *(ptrd++) = (unsigned char)*(pC2++);
-          }
-        }
-      } break;
-      case 28 : { // RGB x/ Alpha 8-bit
-        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2), *pC3 = data(0,0,0,3);
-        cimg_forY(*this,y){
-          unsigned char *ptrd = imgData[y];
-          cimg_forX(*this,x){
-            *(ptrd++) = (unsigned char)*(pC0++);
-            *(ptrd++) = (unsigned char)*(pC1++);
-            *(ptrd++) = (unsigned char)*(pC2++);
-            *(ptrd++) = (unsigned char)*(pC3++);
-          }
-        }
-      } break;
-      case 15 : { // Gray 16-bit
-        cimg_forY(*this,y){
-          unsigned short *ptrd = (unsigned short*)(imgData[y]);
-          cimg_forX(*this,x) *(ptrd++) = (unsigned short)*(pC0++);
-          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],_width);
-        }
-      } break;
-      case 30 : { // Gray w/ Alpha 16-bit
-        const T *pC1 = data(0,0,0,1);
-        cimg_forY(*this,y){
-          unsigned short *ptrd = (unsigned short*)(imgData[y]);
-          cimg_forX(*this,x) {
-            *(ptrd++) = (unsigned short)*(pC0++);
-            *(ptrd++) = (unsigned short)*(pC1++);
-          }
-          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],2*_width);
-        }
-      } break;
-      case 45 : { // RGB 16-bit
-        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2);
-        cimg_forY(*this,y) {
-          unsigned short *ptrd = (unsigned short*)(imgData[y]);
-          cimg_forX(*this,x) {
-            *(ptrd++) = (unsigned short)*(pC0++);
-            *(ptrd++) = (unsigned short)*(pC1++);
-            *(ptrd++) = (unsigned short)*(pC2++);
-          }
-          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],3*_width);
-        }
-      } break;
-      case 60 : { // RGB w/ Alpha 16-bit
-        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2), *pC3 = data(0,0,0,3);
-        cimg_forY(*this,y) {
-          unsigned short *ptrd = (unsigned short*)(imgData[y]);
-          cimg_forX(*this,x) {
-            *(ptrd++) = (unsigned short)*(pC0++);
-            *(ptrd++) = (unsigned short)*(pC1++);
-            *(ptrd++) = (unsigned short)*(pC2++);
-            *(ptrd++) = (unsigned short)*(pC3++);
-          }
-          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],4*_width);
-        }
-      } break;
-      default :
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimg_instance
-                              "save_png(): Encountered unknown fatal error in libpng when saving file '%s'.",
-                              cimg_instance,
-                              nfilename?nfilename:"(FILE*)");
-      }
-      png_write_image(png_ptr,imgData);
-      png_write_end(png_ptr,info_ptr);
-      png_destroy_write_struct(&png_ptr, &info_ptr);
-
-      // Deallocate Image Write Memory
-      cimg_forY(*this,n) delete[] imgData[n];
-      delete[] imgData;
-
-      if (!file) cimg::fclose(nfile);
-      return *this;
-#endif
-    }
-
-    //! Save image as a PNM file.
-    /**
-      \param filename Filename, as a C-string.
-      \param bytes_per_pixel Force the number of bytes per pixels for the saving.
-    **/
-    const CImg<T>& save_pnm(const char *const filename, const unsigned int bytes_per_pixel=0) const {
-      return _save_pnm(0,filename,bytes_per_pixel);
-    }
-
-    //! Save image as a PNM file \overloading.
-    const CImg<T>& save_pnm(std::FILE *const file, const unsigned int bytes_per_pixel=0) const {
-      return _save_pnm(file,0,bytes_per_pixel);
-    }
-
-    const CImg<T>& _save_pnm(std::FILE *const file, const char *const filename,
-                             const unsigned int bytes_per_pixel=0) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_pnm(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-
-      double stmin, stmax = (double)max_min(stmin);
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_pnm(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-      if (_spectrum>3)
-        cimg::warn(_cimg_instance
-                   "save_pnm(): Instance is multispectral, only the three first channels will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
-        cimg::warn(_cimg_instance
-                   "save_pnm(): Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
-                   cimg_instance,
-                   stmin,stmax,filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = (_spectrum>=2)?data(0,0,0,1):0,
-        *ptr_b = (_spectrum>=3)?data(0,0,0,2):0;
-      const ulongT buf_size = std::min((ulongT)(1024*1024),(ulongT)(_width*_height*(_spectrum==1?1UL:3UL)));
-
-      std::fprintf(nfile,"P%c\n%u %u\n%u\n",
-                   (_spectrum==1?'5':'6'),_width,_height,stmax<256?255:(stmax<4096?4095:65535));
-
-      switch (_spectrum) {
-      case 1 : { // Scalar image
-        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PGM 8 bits
-          CImg<ucharT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size);
-            unsigned char *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) *(ptrd++) = (unsigned char)*(ptr_r++);
-            cimg::fwrite(buf._data,N,nfile);
-            to_write-=N;
-          }
-        } else { // Binary PGM 16 bits
-          CImg<ushortT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size);
-            unsigned short *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) *(ptrd++) = (unsigned short)*(ptr_r++);
-            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-            cimg::fwrite(buf._data,N,nfile);
-            to_write-=N;
-          }
-        }
-      } break;
-      case 2 : { // RG image
-        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PPM 8 bits
-          CImg<ucharT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size/3);
-            unsigned char *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) {
-              *(ptrd++) = (unsigned char)*(ptr_r++);
-              *(ptrd++) = (unsigned char)*(ptr_g++);
-              *(ptrd++) = 0;
-            }
-            cimg::fwrite(buf._data,3*N,nfile);
-            to_write-=N;
-          }
-        } else {             // Binary PPM 16 bits
-          CImg<ushortT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size/3);
-            unsigned short *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) {
-              *(ptrd++) = (unsigned short)*(ptr_r++);
-              *(ptrd++) = (unsigned short)*(ptr_g++);
-              *(ptrd++) = 0;
-            }
-            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-            cimg::fwrite(buf._data,3*N,nfile);
-            to_write-=N;
-          }
-        }
-      } break;
-      default : { // RGB image
-        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PPM 8 bits
-          CImg<ucharT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size/3);
-            unsigned char *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) {
-              *(ptrd++) = (unsigned char)*(ptr_r++);
-              *(ptrd++) = (unsigned char)*(ptr_g++);
-              *(ptrd++) = (unsigned char)*(ptr_b++);
-            }
-            cimg::fwrite(buf._data,3*N,nfile);
-            to_write-=N;
-          }
-        } else { // Binary PPM 16 bits
-          CImg<ushortT> buf((unsigned int)buf_size);
-          for (longT to_write = (longT)width()*height(); to_write>0; ) {
-            const ulongT N = std::min((ulongT)to_write,buf_size/3);
-            unsigned short *ptrd = buf._data;
-            for (ulongT i = N; i>0; --i) {
-              *(ptrd++) = (unsigned short)*(ptr_r++);
-              *(ptrd++) = (unsigned short)*(ptr_g++);
-              *(ptrd++) = (unsigned short)*(ptr_b++);
-            }
-            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-            cimg::fwrite(buf._data,3*N,nfile);
-            to_write-=N;
-          }
-        }
-      }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a PNK file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_pnk(const char *const filename) const {
-      return _save_pnk(0,filename);
-    }
-
-    //! Save image as a PNK file \overloading.
-    const CImg<T>& save_pnk(std::FILE *const file) const {
-      return _save_pnk(file,0);
-    }
-
-    const CImg<T>& _save_pnk(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_pnk(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_spectrum>1)
-        cimg::warn(_cimg_instance
-                   "save_pnk(): Instance is multispectral, only the first channel will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      const ulongT buf_size = std::min((ulongT)1024*1024,(ulongT)_width*_height*_depth);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const T *ptr = data(0,0,0,0);
-
-      if (!cimg::type<T>::is_float() && sizeof(T)==1 && _depth<2) // Can be saved as regular PNM file.
-        _save_pnm(file,filename,0);
-      else if (!cimg::type<T>::is_float() && sizeof(T)==1) { // Save as extended P5 file: Binary byte-valued 3d.
-        std::fprintf(nfile,"P5\n%u %u %u\n255\n",_width,_height,_depth);
-        CImg<ucharT> buf((unsigned int)buf_size);
-        for (longT to_write = (longT)width()*height()*depth(); to_write>0; ) {
-          const ulongT N = std::min((ulongT)to_write,buf_size);
-          unsigned char *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) *(ptrd++) = (unsigned char)*(ptr++);
-          cimg::fwrite(buf._data,N,nfile);
-          to_write-=N;
-        }
-      } else if (!cimg::type<T>::is_float()) { // Save as P8: Binary int32-valued 3d.
-        if (_depth>1) std::fprintf(nfile,"P8\n%u %u %u\n%d\n",_width,_height,_depth,(int)max());
-        else std::fprintf(nfile,"P8\n%u %u\n%d\n",_width,_height,(int)max());
-        CImg<intT> buf((unsigned int)buf_size);
-        for (longT to_write = (longT)width()*height()*depth(); to_write>0; ) {
-          const ulongT N = std::min((ulongT)to_write,buf_size);
-          int *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) *(ptrd++) = (int)*(ptr++);
-          cimg::fwrite(buf._data,N,nfile);
-          to_write-=N;
-        }
-      } else { // Save as P9: Binary float-valued 3d.
-        if (_depth>1) std::fprintf(nfile,"P9\n%u %u %u\n%g\n",_width,_height,_depth,(double)max());
-        else std::fprintf(nfile,"P9\n%u %u\n%g\n",_width,_height,(double)max());
-        CImg<floatT> buf((unsigned int)buf_size);
-        for (longT to_write = (longT)width()*height()*depth(); to_write>0; ) {
-          const ulongT N = std::min((ulongT)to_write,buf_size);
-          float *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) *(ptrd++) = (float)*(ptr++);
-          cimg::fwrite(buf._data,N,nfile);
-          to_write-=N;
-        }
-      }
-
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a PFM file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_pfm(const char *const filename) const {
-      get_mirror('y')._save_pfm(0,filename);
-      return *this;
-    }
-
-    //! Save image as a PFM file \overloading.
-    const CImg<T>& save_pfm(std::FILE *const file) const {
-      get_mirror('y')._save_pfm(file,0);
-      return *this;
-    }
-
-    const CImg<T>& _save_pfm(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_pfm(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_pfm(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-      if (_spectrum>3)
-        cimg::warn(_cimg_instance
-                   "save_pfm(): image instance is multispectral, only the three first channels will be saved "
-                   "in file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const T
-        *ptr_r = data(0,0,0,0),
-        *ptr_g = (_spectrum>=2)?data(0,0,0,1):0,
-        *ptr_b = (_spectrum>=3)?data(0,0,0,2):0;
-      const unsigned int buf_size = std::min(1024*1024U,_width*_height*(_spectrum==1?1:3));
-
-      std::fprintf(nfile,"P%c\n%u %u\n1.0\n",
-                   (_spectrum==1?'f':'F'),_width,_height);
-
-      switch (_spectrum) {
-      case 1 : { // Scalar image
-        CImg<floatT> buf(buf_size);
-        for (longT to_write = (longT)width()*height(); to_write>0; ) {
-          const ulongT N = std::min((ulongT)to_write,(ulongT)buf_size);
-          float *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) *(ptrd++) = (float)*(ptr_r++);
-          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-          cimg::fwrite(buf._data,N,nfile);
-          to_write-=N;
-        }
-      } break;
-      case 2 : { // RG image
-        CImg<floatT> buf(buf_size);
-        for (longT to_write = (longT)width()*height(); to_write>0; ) {
-          const unsigned int N = std::min((unsigned int)to_write,buf_size/3);
-          float *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) {
-            *(ptrd++) = (float)*(ptr_r++);
-            *(ptrd++) = (float)*(ptr_g++);
-            *(ptrd++) = 0;
-          }
-          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-          cimg::fwrite(buf._data,3*N,nfile);
-          to_write-=N;
-        }
-      } break;
-      default : { // RGB image
-        CImg<floatT> buf(buf_size);
-        for (longT to_write = (longT)width()*height(); to_write>0; ) {
-          const unsigned int N = std::min((unsigned int)to_write,buf_size/3);
-          float *ptrd = buf._data;
-          for (ulongT i = N; i>0; --i) {
-            *(ptrd++) = (float)*(ptr_r++);
-            *(ptrd++) = (float)*(ptr_g++);
-            *(ptrd++) = (float)*(ptr_b++);
-          }
-          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
-          cimg::fwrite(buf._data,3*N,nfile);
-          to_write-=N;
-        }
-      }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a RGB file.
-    /**
-      \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_rgb(const char *const filename) const {
-      return _save_rgb(0,filename);
-    }
-
-    //! Save image as a RGB file \overloading.
-    const CImg<T>& save_rgb(std::FILE *const file) const {
-      return _save_rgb(file,0);
-    }
-
-    const CImg<T>& _save_rgb(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_rgb(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_spectrum!=3)
-        cimg::warn(_cimg_instance
-                   "save_rgb(): image instance has not exactly 3 channels, for file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const ulongT wh = (ulongT)_width*_height;
-      unsigned char *const buffer = new unsigned char[3*wh], *nbuffer = buffer;
-      const T
-        *ptr1 = data(0,0,0,0),
-        *ptr2 = _spectrum>1?data(0,0,0,1):0,
-        *ptr3 = _spectrum>2?data(0,0,0,2):0;
-      switch (_spectrum) {
-      case 1 : { // Scalar image
-        for (ulongT k = 0; k<wh; ++k) {
-          const unsigned char val = (unsigned char)*(ptr1++);
-          *(nbuffer++) = val;
-          *(nbuffer++) = val;
-          *(nbuffer++) = val;
-        }
-      } break;
-      case 2 : { // RG image
-        for (ulongT k = 0; k<wh; ++k) {
-          *(nbuffer++) = (unsigned char)(*(ptr1++));
-          *(nbuffer++) = (unsigned char)(*(ptr2++));
-          *(nbuffer++) = 0;
-        }
-      } break;
-      default : { // RGB image
-        for (ulongT k = 0; k<wh; ++k) {
-          *(nbuffer++) = (unsigned char)(*(ptr1++));
-          *(nbuffer++) = (unsigned char)(*(ptr2++));
-          *(nbuffer++) = (unsigned char)(*(ptr3++));
-        }
-      }
-      }
-      cimg::fwrite(buffer,3*wh,nfile);
-      if (!file) cimg::fclose(nfile);
-      delete[] buffer;
-      return *this;
-    }
-
-    //! Save image as a RGBA file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    const CImg<T>& save_rgba(const char *const filename) const {
-      return _save_rgba(0,filename);
-    }
-
-    //! Save image as a RGBA file \overloading.
-    const CImg<T>& save_rgba(std::FILE *const file) const {
-      return _save_rgba(file,0);
-    }
-
-    const CImg<T>& _save_rgba(std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_rgba(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if (_spectrum!=4)
-        cimg::warn(_cimg_instance
-                   "save_rgba(): image instance has not exactly 4 channels, for file '%s'.",
-                   cimg_instance,
-                   filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const ulongT wh = (ulongT)_width*_height;
-      unsigned char *const buffer = new unsigned char[4*wh], *nbuffer = buffer;
-      const T
-        *ptr1 = data(0,0,0,0),
-        *ptr2 = _spectrum>1?data(0,0,0,1):0,
-        *ptr3 = _spectrum>2?data(0,0,0,2):0,
-        *ptr4 = _spectrum>3?data(0,0,0,3):0;
-      switch (_spectrum) {
-      case 1 : { // Scalar images
-        for (ulongT k = 0; k<wh; ++k) {
-          const unsigned char val = (unsigned char)*(ptr1++);
-          *(nbuffer++) = val;
-          *(nbuffer++) = val;
-          *(nbuffer++) = val;
-          *(nbuffer++) = 255;
-        }
-      } break;
-      case 2 : { // RG images
-        for (ulongT k = 0; k<wh; ++k) {
-          *(nbuffer++) = (unsigned char)(*(ptr1++));
-          *(nbuffer++) = (unsigned char)(*(ptr2++));
-          *(nbuffer++) = 0;
-          *(nbuffer++) = 255;
-        }
-      } break;
-      case 3 : { // RGB images
-        for (ulongT k = 0; k<wh; ++k) {
-          *(nbuffer++) = (unsigned char)(*(ptr1++));
-          *(nbuffer++) = (unsigned char)(*(ptr2++));
-          *(nbuffer++) = (unsigned char)(*(ptr3++));
-          *(nbuffer++) = 255;
-        }
-      } break;
-      default : { // RGBA images
-        for (ulongT k = 0; k<wh; ++k) {
-          *(nbuffer++) = (unsigned char)(*(ptr1++));
-          *(nbuffer++) = (unsigned char)(*(ptr2++));
-          *(nbuffer++) = (unsigned char)(*(ptr3++));
-          *(nbuffer++) = (unsigned char)(*(ptr4++));
-        }
-      }
-      }
-      cimg::fwrite(buffer,4*wh,nfile);
-      if (!file) cimg::fclose(nfile);
-      delete[] buffer;
-      return *this;
-    }
-
-    //! Save image as a TIFF file.
-    /**
-       \param filename Filename, as a C-string.
-       \param compression_type Type of data compression. Can be <tt>{ 0=None | 1=LZW | 2=JPEG }</tt>.
-       \note
-       - libtiff support is enabled by defining the precompilation
-        directive \c cimg_use_tif.
-       - When libtiff is enabled, 2D and 3D (multipage) several
-        channel per pixel are supported for
-        <tt>char,uchar,short,ushort,float</tt> and \c double pixel types.
-       - If \c cimg_use_tif is not defined at compile time the
-        function uses CImg<T>&save_other(const char*).
-     **/
-    const CImg<T>& save_tiff(const char *const filename, const unsigned int compression_type=0,
-                             const float *const voxel_size=0, const char *const description=0,
-                             const bool use_bigtiff=true) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_tiff(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-#ifdef cimg_use_tiff
-      const bool
-        _use_bigtiff = use_bigtiff && sizeof(ulongT)>=8 && size()*sizeof(T)>=1UL<<31; // No bigtiff for small images.
-      TIFF *tif = TIFFOpen(filename,_use_bigtiff?"w8":"w4");
-      if (tif) {
-        cimg_forZ(*this,z) _save_tiff(tif,z,z,compression_type,voxel_size,description);
-        TIFFClose(tif);
-      } else throw CImgIOException(_cimg_instance
-                                   "save_tiff(): Failed to open file '%s' for writing.",
-                                   cimg_instance,
-                                   filename);
-      return *this;
-#else
-      cimg::unused(compression_type,voxel_size,description,use_bigtiff);
-      return save_other(filename);
-#endif
-    }
-
-#ifdef cimg_use_tiff
-
-#define _cimg_save_tiff(types,typed,compression_type) if (!std::strcmp(types,pixel_type())) { \
-      const typed foo = (typed)0; return _save_tiff(tif,directory,z,foo,compression_type,voxel_size,description); }
-
-    // [internal] Save a plane into a tiff file
-    template<typename t>
-    const CImg<T>& _save_tiff(TIFF *tif, const unsigned int directory, const unsigned int z, const t& pixel_t,
-                              const unsigned int compression_type, const float *const voxel_size,
-                              const char *const description) const {
-      if (is_empty() || !tif || pixel_t) return *this;
-      const char *const filename = TIFFFileName(tif);
-      uint32 rowsperstrip = (uint32)-1;
-      uint16 spp = _spectrum, bpp = sizeof(t)*8, photometric;
-      if (spp==3 || spp==4) photometric = PHOTOMETRIC_RGB;
-      else photometric = PHOTOMETRIC_MINISBLACK;
-      TIFFSetDirectory(tif,directory);
-      TIFFSetField(tif,TIFFTAG_IMAGEWIDTH,_width);
-      TIFFSetField(tif,TIFFTAG_IMAGELENGTH,_height);
-      if (voxel_size) {
-        const float vx = voxel_size[0], vy = voxel_size[1], vz = voxel_size[2];
-        TIFFSetField(tif,TIFFTAG_RESOLUTIONUNIT,RESUNIT_NONE);
-        TIFFSetField(tif,TIFFTAG_XRESOLUTION,1.0f/vx);
-        TIFFSetField(tif,TIFFTAG_YRESOLUTION,1.0f/vy);
-        CImg<charT> s_description(256);
-        cimg_snprintf(s_description,s_description._width,"VX=%g VY=%g VZ=%g spacing=%g",vx,vy,vz,vz);
-        TIFFSetField(tif,TIFFTAG_IMAGEDESCRIPTION,s_description.data());
-      }
-      if (description) TIFFSetField(tif,TIFFTAG_IMAGEDESCRIPTION,description);
-      TIFFSetField(tif,TIFFTAG_ORIENTATION,ORIENTATION_TOPLEFT);
-      TIFFSetField(tif,TIFFTAG_SAMPLESPERPIXEL,spp);
-      if (cimg::type<t>::is_float()) TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,3);
-      else if (cimg::type<t>::min()==0) TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,1);
-      else TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,2);
-      TIFFSetField(tif,TIFFTAG_BITSPERSAMPLE,bpp);
-      TIFFSetField(tif,TIFFTAG_PLANARCONFIG,PLANARCONFIG_CONTIG);
-      TIFFSetField(tif,TIFFTAG_PHOTOMETRIC,photometric);
-      TIFFSetField(tif,TIFFTAG_COMPRESSION,compression_type==2?COMPRESSION_JPEG:
-                   compression_type==1?COMPRESSION_LZW:COMPRESSION_NONE);
-      rowsperstrip = TIFFDefaultStripSize(tif,rowsperstrip);
-      TIFFSetField(tif,TIFFTAG_ROWSPERSTRIP,rowsperstrip);
-      TIFFSetField(tif,TIFFTAG_FILLORDER,FILLORDER_MSB2LSB);
-      TIFFSetField(tif,TIFFTAG_SOFTWARE,"CImg");
-      t *const buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
-      if (buf) {
-        for (unsigned int row = 0; row<_height; row+=rowsperstrip) {
-          uint32 nrow = (row + rowsperstrip>_height?_height - row:rowsperstrip);
-          tstrip_t strip = TIFFComputeStrip(tif,row,0);
-          tsize_t i = 0;
-          for (unsigned int rr = 0; rr<nrow; ++rr)
-            for (unsigned int cc = 0; cc<_width; ++cc)
-              for (unsigned int vv = 0; vv<spp; ++vv)
-                buf[i++] = (t)(*this)(cc,row + rr,z,vv);
-          if (TIFFWriteEncodedStrip(tif,strip,buf,i*sizeof(t))<0)
-            throw CImgIOException(_cimg_instance
-                                  "save_tiff(): Invalid strip writing when saving file '%s'.",
-                                  cimg_instance,
-                                  filename?filename:"(FILE*)");
-        }
-        _TIFFfree(buf);
-      }
-      TIFFWriteDirectory(tif);
-      return (*this);
-    }
-
-    const CImg<T>& _save_tiff(TIFF *tif, const unsigned int directory, const unsigned int z,
-                              const unsigned int compression_type, const float *const voxel_size,
-                              const char *const description) const {
-      _cimg_save_tiff("bool",unsigned char,compression_type);
-      _cimg_save_tiff("unsigned char",unsigned char,compression_type);
-      _cimg_save_tiff("char",char,compression_type);
-      _cimg_save_tiff("unsigned short",unsigned short,compression_type);
-      _cimg_save_tiff("short",short,compression_type);
-      _cimg_save_tiff("unsigned int",unsigned int,compression_type);
-      _cimg_save_tiff("int",int,compression_type);
-      _cimg_save_tiff("unsigned int64",unsigned int,compression_type);
-      _cimg_save_tiff("int64",int,compression_type);
-      _cimg_save_tiff("float",float,compression_type);
-      _cimg_save_tiff("double",float,compression_type);
-      const char *const filename = TIFFFileName(tif);
-      throw CImgInstanceException(_cimg_instance
-                                  "save_tiff(): Unsupported pixel type '%s' for file '%s'.",
-                                  cimg_instance,
-                                  pixel_type(),filename?filename:"(FILE*)");
-      return *this;
-    }
-#endif
-
-    //! Save image as a MINC2 file.
-    /**
-       \param filename Filename, as a C-string.
-       \param imitate_file If non-zero, reference filename, as a C-string, to borrow header from.
-    **/
-    const CImg<T>& save_minc2(const char *const filename,
-                              const char *const imitate_file=0) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                   "save_minc2(): Specified filename is (null).",
-                                   cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-#ifndef cimg_use_minc2
-     cimg::unused(imitate_file);
-     return save_other(filename);
-#else
-     minc::minc_1_writer wtr;
-     if (imitate_file)
-       wtr.open(filename, imitate_file);
-     else {
-       minc::minc_info di;
-       if (width()) di.push_back(minc::dim_info(width(),width()*0.5,-1,minc::dim_info::DIM_X));
-       if (height()) di.push_back(minc::dim_info(height(),height()*0.5,-1,minc::dim_info::DIM_Y));
-       if (depth()) di.push_back(minc::dim_info(depth(),depth()*0.5,-1,minc::dim_info::DIM_Z));
-       if (spectrum()) di.push_back(minc::dim_info(spectrum(),spectrum()*0.5,-1,minc::dim_info::DIM_TIME));
-       wtr.open(filename,di,1,NC_FLOAT,0);
-     }
-     if (typeid(T)==typeid(unsigned char))
-       wtr.setup_write_byte();
-     else if (typeid(T)==typeid(int))
-       wtr.setup_write_int();
-     else if (typeid(T)==typeid(double))
-       wtr.setup_write_double();
-     else
-       wtr.setup_write_float();
-     minc::save_standard_volume(wtr, this->_data);
-     return *this;
-#endif
-    }
-
-    //! Save image as an ANALYZE7.5 or NIFTI file.
-    /**
-      \param filename Filename, as a C-string.
-      \param voxel_size Pointer to 3 consecutive values that tell about the voxel sizes along the X,Y and Z dimensions.
-    **/
-    const CImg<T>& save_analyze(const char *const filename, const float *const voxel_size=0) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_analyze(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-      std::FILE *file;
-      CImg<charT> hname(1024), iname(1024);
-      const char *const ext = cimg::split_filename(filename);
-      short datatype = -1;
-      if (!*ext) {
-        cimg_snprintf(hname,hname._width,"%s.hdr",filename);
-        cimg_snprintf(iname,iname._width,"%s.img",filename);
-      }
-      if (!cimg::strncasecmp(ext,"hdr",3)) {
-        std::strcpy(hname,filename);
-        std::strncpy(iname,filename,iname._width - 1);
-        cimg_sprintf(iname._data + std::strlen(iname) - 3,"img");
-      }
-      if (!cimg::strncasecmp(ext,"img",3)) {
-        std::strcpy(hname,filename);
-        std::strncpy(iname,filename,iname._width - 1);
-        cimg_sprintf(hname._data + std::strlen(iname) - 3,"hdr");
-      }
-      if (!cimg::strncasecmp(ext,"nii",3)) {
-        std::strncpy(hname,filename,hname._width - 1); *iname = 0;
-      }
-
-      CImg<charT> header(*iname?348:352,1,1,1,0);
-      int *const iheader = (int*)header._data;
-      *iheader = 348;
-      std::strcpy(header._data + 4,"CImg");
-      std::strcpy(header._data + 14," ");
-      ((short*)&(header[36]))[0] = 4096;
-      ((char*)&(header[38]))[0] = 114;
-      ((short*)&(header[40]))[0] = 4;
-      ((short*)&(header[40]))[1] = (short)_width;
-      ((short*)&(header[40]))[2] = (short)_height;
-      ((short*)&(header[40]))[3] = (short)_depth;
-      ((short*)&(header[40]))[4] = (short)_spectrum;
-      if (!cimg::strcasecmp(pixel_type(),"bool")) datatype = 2;
-      if (!cimg::strcasecmp(pixel_type(),"unsigned char")) datatype = 2;
-      if (!cimg::strcasecmp(pixel_type(),"char")) datatype = 2;
-      if (!cimg::strcasecmp(pixel_type(),"unsigned short")) datatype = 4;
-      if (!cimg::strcasecmp(pixel_type(),"short")) datatype = 4;
-      if (!cimg::strcasecmp(pixel_type(),"unsigned int")) datatype = 8;
-      if (!cimg::strcasecmp(pixel_type(),"int")) datatype = 8;
-      if (!cimg::strcasecmp(pixel_type(),"unsigned int64")) datatype = 8;
-      if (!cimg::strcasecmp(pixel_type(),"int64")) datatype = 8;
-      if (!cimg::strcasecmp(pixel_type(),"float")) datatype = 16;
-      if (!cimg::strcasecmp(pixel_type(),"double")) datatype = 64;
-      if (datatype<0)
-        throw CImgIOException(_cimg_instance
-                              "save_analyze(): Unsupported pixel type '%s' for file '%s'.",
-                              cimg_instance,
-                              pixel_type(),filename);
-
-      ((short*)&(header[70]))[0] = datatype;
-      ((short*)&(header[72]))[0] = sizeof(T);
-      ((float*)&(header[108]))[0] = (float)(*iname?0:header.width());
-      ((float*)&(header[112]))[0] = 1;
-      ((float*)&(header[76]))[0] = 0;
-      if (voxel_size) {
-        ((float*)&(header[76]))[1] = voxel_size[0];
-        ((float*)&(header[76]))[2] = voxel_size[1];
-        ((float*)&(header[76]))[3] = voxel_size[2];
-      } else ((float*)&(header[76]))[1] = ((float*)&(header[76]))[2] = ((float*)&(header[76]))[3] = 1;
-      file = cimg::fopen(hname,"wb");
-      cimg::fwrite(header._data,header.width(),file);
-      if (*iname) { cimg::fclose(file); file = cimg::fopen(iname,"wb"); }
-      cimg::fwrite(_data,size(),file);
-      cimg::fclose(file);
-      return *this;
-    }
-
-    //! Save image as a .cimg file.
-    /**
-      \param filename Filename, as a C-string.
-      \param is_compressed Tells if the file contains compressed image data.
-    **/
-    const CImg<T>& save_cimg(const char *const filename, const bool is_compressed=false) const {
-      CImgList<T>(*this,true).save_cimg(filename,is_compressed);
-      return *this;
-    }
-
-    //! Save image as a .cimg file \overloading.
-    const CImg<T>& save_cimg(std::FILE *const file, const bool is_compressed=false) const {
-      CImgList<T>(*this,true).save_cimg(file,is_compressed);
-      return *this;
-    }
-
-    //! Save image as a sub-image into an existing .cimg file.
-    /**
-      \param filename Filename, as a C-string.
-      \param n0 Index of the image inside the file.
-      \param x0 X-coordinate of the sub-image location.
-      \param y0 Y-coordinate of the sub-image location.
-      \param z0 Z-coordinate of the sub-image location.
-      \param c0 C-coordinate of the sub-image location.
-    **/
-    const CImg<T>& save_cimg(const char *const filename,
-                             const unsigned int n0,
-                             const unsigned int x0, const unsigned int y0,
-                             const unsigned int z0, const unsigned int c0) const {
-      CImgList<T>(*this,true).save_cimg(filename,n0,x0,y0,z0,c0);
-      return *this;
-    }
-
-    //! Save image as a sub-image into an existing .cimg file \overloading.
-    const CImg<T>& save_cimg(std::FILE *const file,
-                             const unsigned int n0,
-                             const unsigned int x0, const unsigned int y0,
-                             const unsigned int z0, const unsigned int c0) const {
-      CImgList<T>(*this,true).save_cimg(file,n0,x0,y0,z0,c0);
-      return *this;
-    }
-
-    //! Save blank image as a .cimg file.
-    /**
-        \param filename Filename, as a C-string.
-        \param dx Width of the image.
-        \param dy Height of the image.
-        \param dz Depth of the image.
-        \param dc Number of channels of the image.
-        \note
-        - All pixel values of the saved image are set to \c 0.
-        - Use this method to save large images without having to instanciate and allocate them.
-    **/
-    static void save_empty_cimg(const char *const filename,
-                                const unsigned int dx, const unsigned int dy=1,
-                                const unsigned int dz=1, const unsigned int dc=1) {
-      return CImgList<T>::save_empty_cimg(filename,1,dx,dy,dz,dc);
-    }
-
-    //! Save blank image as a .cimg file \overloading.
-    /**
-       Same as save_empty_cimg(const char *,unsigned int,unsigned int,unsigned int,unsigned int)
-       with a file stream argument instead of a filename string.
-    **/
-    static void save_empty_cimg(std::FILE *const file,
-                                const unsigned int dx, const unsigned int dy=1,
-                                const unsigned int dz=1, const unsigned int dc=1) {
-      return CImgList<T>::save_empty_cimg(file,1,dx,dy,dz,dc);
-    }
-
-    //! Save image as an INRIMAGE-4 file.
-    /**
-      \param filename Filename, as a C-string.
-      \param voxel_size Pointer to 3 values specifying the voxel sizes along the X,Y and Z dimensions.
-    **/
-    const CImg<T>& save_inr(const char *const filename, const float *const voxel_size=0) const {
-      return _save_inr(0,filename,voxel_size);
-    }
-
-    //! Save image as an INRIMAGE-4 file \overloading.
-    const CImg<T>& save_inr(std::FILE *const file, const float *const voxel_size=0) const {
-      return _save_inr(file,0,voxel_size);
-    }
-
-    const CImg<T>& _save_inr(std::FILE *const file, const char *const filename, const float *const voxel_size) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_inr(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-
-      int inrpixsize = -1;
-      const char *inrtype = "unsigned fixed\nPIXSIZE=8 bits\nSCALE=2**0";
-      if (!cimg::strcasecmp(pixel_type(),"unsigned char")) {
-        inrtype = "unsigned fixed\nPIXSIZE=8 bits\nSCALE=2**0"; inrpixsize = 1;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"char")) {
-        inrtype = "fixed\nPIXSIZE=8 bits\nSCALE=2**0"; inrpixsize = 1;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"unsigned short")) {
-        inrtype = "unsigned fixed\nPIXSIZE=16 bits\nSCALE=2**0";inrpixsize = 2;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"short")) {
-        inrtype = "fixed\nPIXSIZE=16 bits\nSCALE=2**0"; inrpixsize = 2;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"unsigned int")) {
-        inrtype = "unsigned fixed\nPIXSIZE=32 bits\nSCALE=2**0";inrpixsize = 4;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"int")) {
-        inrtype = "fixed\nPIXSIZE=32 bits\nSCALE=2**0"; inrpixsize = 4;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"float")) {
-        inrtype = "float\nPIXSIZE=32 bits"; inrpixsize = 4;
-      }
-      if (!cimg::strcasecmp(pixel_type(),"double")) {
-        inrtype = "float\nPIXSIZE=64 bits"; inrpixsize = 8;
-      }
-      if (inrpixsize<=0)
-        throw CImgIOException(_cimg_instance
-                              "save_inr(): Unsupported pixel type '%s' for file '%s'",
-                              cimg_instance,
-                              pixel_type(),filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      CImg<charT> header(257);
-      int err = cimg_snprintf(header,header._width,"#INRIMAGE-4#{\nXDIM=%u\nYDIM=%u\nZDIM=%u\nVDIM=%u\n",
-                              _width,_height,_depth,_spectrum);
-      if (voxel_size) err+=cimg_sprintf(header._data + err,"VX=%g\nVY=%g\nVZ=%g\n",
-                                        voxel_size[0],voxel_size[1],voxel_size[2]);
-      err+=cimg_sprintf(header._data + err,"TYPE=%s\nCPU=%s\n",inrtype,cimg::endianness()?"sun":"decm");
-      std::memset(header._data + err,'\n',252 - err);
-      std::memcpy(header._data + 252,"##}\n",4);
-      cimg::fwrite(header._data,256,nfile);
-      cimg_forXYZ(*this,x,y,z) cimg_forC(*this,c) cimg::fwrite(&((*this)(x,y,z,c)),1,nfile);
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as an OpenEXR file.
-    /**
-       \param filename Filename, as a C-string.
-       \note The OpenEXR file format is <a href="http://en.wikipedia.org/wiki/OpenEXR">described here</a>.
-    **/
-    const CImg<T>& save_exr(const char *const filename) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_exr(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_exr(): Instance is volumetric, only the first slice will be saved in file '%s'.",
-                   cimg_instance,
-                   filename);
-
-#ifndef cimg_use_openexr
-      return save_other(filename);
-#else
-      Imf::Rgba *const ptrd0 = new Imf::Rgba[(size_t)_width*_height], *ptrd = ptrd0, rgba;
-      switch (_spectrum) {
-      case 1 : { // Grayscale image.
-        for (const T *ptr_r = data(), *const ptr_e = ptr_r + (ulongT)_width*_height; ptr_r<ptr_e;) {
-          rgba.r = rgba.g = rgba.b = (half)(*(ptr_r++));
-          rgba.a = (half)1;
-          *(ptrd++) = rgba;
-        }
-      } break;
-      case 2 : { // RG image.
-        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1),
-               *const ptr_e = ptr_r + (ulongT)_width*_height; ptr_r<ptr_e; ) {
-          rgba.r = (half)(*(ptr_r++));
-          rgba.g = (half)(*(ptr_g++));
-          rgba.b = (half)0;
-          rgba.a = (half)1;
-          *(ptrd++) = rgba;
-        }
-      } break;
-      case 3 : { // RGB image.
-        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2),
-               *const ptr_e = ptr_r + (ulongT)_width*_height; ptr_r<ptr_e;) {
-          rgba.r = (half)(*(ptr_r++));
-          rgba.g = (half)(*(ptr_g++));
-          rgba.b = (half)(*(ptr_b++));
-          rgba.a = (half)1;
-          *(ptrd++) = rgba;
-        }
-      } break;
-      default : { // RGBA image.
-        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3),
-               *const ptr_e = ptr_r + (ulongT)_width*_height; ptr_r<ptr_e;) {
-          rgba.r = (half)(*(ptr_r++));
-          rgba.g = (half)(*(ptr_g++));
-          rgba.b = (half)(*(ptr_b++));
-          rgba.a = (half)(*(ptr_a++));
-          *(ptrd++) = rgba;
-        }
-      } break;
-      }
-      Imf::RgbaOutputFile outFile(filename,_width,_height,
-                                  _spectrum==1?Imf::WRITE_Y:_spectrum==2?Imf::WRITE_YA:_spectrum==3?
-                                  Imf::WRITE_RGB:Imf::WRITE_RGBA);
-      outFile.setFrameBuffer(ptrd0,1,_width);
-      outFile.writePixels(_height);
-      delete[] ptrd0;
-      return *this;
-#endif
-    }
-
-    //! Save image as a Pandore-5 file.
-    /**
-       \param filename Filename, as a C-string.
-       \param colorspace Colorspace data field in output file
-       (see <a href="http://www.greyc.ensicaen.fr/~regis/Pandore">Pandore file specifications</a>
-       for more information).
-    **/
-    const CImg<T>& save_pandore(const char *const filename, const unsigned int colorspace=0) const {
-      return _save_pandore(0,filename,colorspace);
-    }
-
-    //! Save image as a Pandore-5 file \overloading.
-    /**
-        Same as save_pandore(const char *,unsigned int) const
-        with a file stream argument instead of a filename string.
-    **/
-    const CImg<T>& save_pandore(std::FILE *const file, const unsigned int colorspace=0) const {
-      return _save_pandore(file,0,colorspace);
-    }
-
-    unsigned int _save_pandore_header_length(unsigned int id, unsigned int *dims, const unsigned int colorspace) const {
-      unsigned int nbdims = 0;
-      if (id==2 || id==3 || id==4) {
-        dims[0] = 1; dims[1] = _width; nbdims = 2;
-      }
-      if (id==5 || id==6 || id==7) {
-        dims[0] = 1; dims[1] = _height; dims[2] = _width; nbdims=3;
-      }
-      if (id==8 || id==9 || id==10) {
-        dims[0] = _spectrum; dims[1] = _depth; dims[2] = _height; dims[3] = _width; nbdims = 4;
-      }
-      if (id==16 || id==17 || id==18) {
-        dims[0] = 3; dims[1] = _height; dims[2] = _width; dims[3] = colorspace; nbdims = 4;
-      }
-      if (id==19 || id==20 || id==21) {
-        dims[0] = 3; dims[1] = _depth; dims[2] = _height; dims[3] = _width; dims[4] = colorspace; nbdims = 5;
-      }
-      if (id==22 || id==23 || id==25) {
-        dims[0] = _spectrum; dims[1] = _width; nbdims = 2;
-      }
-      if (id==26 || id==27 || id==29) {
-        dims[0] = _spectrum; dims[1] = _height; dims[2] = _width; nbdims=3;
-      }
-      if (id==30 || id==31 || id==33) {
-        dims[0] = _spectrum; dims[1] = _depth; dims[2] = _height; dims[3] = _width; nbdims = 4;
-      }
-      return nbdims;
-    }
-
-    const CImg<T>& _save_pandore(std::FILE *const file, const char *const filename,
-                                 const unsigned int colorspace) const {
-
-#define __cimg_save_pandore_case(dtype) \
-       dtype *buffer = new dtype[size()]; \
-       const T *ptrs = _data; \
-       cimg_foroff(*this,off) *(buffer++) = (dtype)(*(ptrs++)); \
-       buffer-=size(); \
-       cimg::fwrite(buffer,size(),nfile); \
-       delete[] buffer
-
-#define _cimg_save_pandore_case(sy,sz,sv,stype,id) \
-      if (!saved && (sy?(sy==_height):true) && (sz?(sz==_depth):true) && \
-          (sv?(sv==_spectrum):true) && !std::strcmp(stype,pixel_type())) { \
-        unsigned int *iheader = (unsigned int*)(header + 12); \
-        nbdims = _save_pandore_header_length((*iheader=id),dims,colorspace); \
-        cimg::fwrite(header,36,nfile); \
-        if (sizeof(unsigned long)==4) { CImg<ulongT> ndims(5); \
-          for (int d = 0; d<5; ++d) ndims[d] = (unsigned long)dims[d]; cimg::fwrite(ndims._data,nbdims,nfile); } \
-        else if (sizeof(unsigned int)==4) { CImg<uintT> ndims(5); \
-          for (int d = 0; d<5; ++d) ndims[d] = (unsigned int)dims[d]; cimg::fwrite(ndims._data,nbdims,nfile); } \
-        else if (sizeof(unsigned short)==4) { CImg<ushortT> ndims(5); \
-          for (int d = 0; d<5; ++d) ndims[d] = (unsigned short)dims[d]; cimg::fwrite(ndims._data,nbdims,nfile); } \
-        else throw CImgIOException(_cimg_instance \
-                                   "save_pandore(): Unsupported datatype for file '%s'.",\
-                                   cimg_instance, \
-                                   filename?filename:"(FILE*)"); \
-        if (id==2 || id==5 || id==8 || id==16 || id==19 || id==22 || id==26 || id==30) { \
-          __cimg_save_pandore_case(unsigned char); \
-        } else if (id==3 || id==6 || id==9 || id==17 || id==20 || id==23 || id==27 || id==31) { \
-          if (sizeof(unsigned long)==4) { __cimg_save_pandore_case(unsigned long); } \
-          else if (sizeof(unsigned int)==4) { __cimg_save_pandore_case(unsigned int); } \
-          else if (sizeof(unsigned short)==4) { __cimg_save_pandore_case(unsigned short); } \
-          else throw CImgIOException(_cimg_instance \
-                                     "save_pandore(): Unsupported datatype for file '%s'.",\
-                                     cimg_instance, \
-                                     filename?filename:"(FILE*)"); \
-        } else if (id==4 || id==7 || id==10 || id==18 || id==21 || id==25 || id==29 || id==33) { \
-          if (sizeof(double)==4) { __cimg_save_pandore_case(double); } \
-          else if (sizeof(float)==4) { __cimg_save_pandore_case(float); } \
-          else throw CImgIOException(_cimg_instance \
-                                     "save_pandore(): Unsupported datatype for file '%s'.",\
-                                     cimg_instance, \
-                                     filename?filename:"(FILE*)"); \
-        } \
-        saved = true; \
-      }
-
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_pandore(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      unsigned char header[36] = { 'P','A','N','D','O','R','E','0','4',0,0,0,
-                                   0,0,0,0,'C','I','m','g',0,0,0,0,0,
-                                   'N','o',' ','d','a','t','e',0,0,0,0 };
-      unsigned int nbdims, dims[5] = { 0 };
-      bool saved = false;
-      _cimg_save_pandore_case(1,1,1,"unsigned char",2);
-      _cimg_save_pandore_case(1,1,1,"char",3);
-      _cimg_save_pandore_case(1,1,1,"unsigned short",3);
-      _cimg_save_pandore_case(1,1,1,"short",3);
-      _cimg_save_pandore_case(1,1,1,"unsigned int",3);
-      _cimg_save_pandore_case(1,1,1,"int",3);
-      _cimg_save_pandore_case(1,1,1,"unsigned int64",3);
-      _cimg_save_pandore_case(1,1,1,"int64",3);
-      _cimg_save_pandore_case(1,1,1,"float",4);
-      _cimg_save_pandore_case(1,1,1,"double",4);
-
-      _cimg_save_pandore_case(0,1,1,"unsigned char",5);
-      _cimg_save_pandore_case(0,1,1,"char",6);
-      _cimg_save_pandore_case(0,1,1,"unsigned short",6);
-      _cimg_save_pandore_case(0,1,1,"short",6);
-      _cimg_save_pandore_case(0,1,1,"unsigned int",6);
-      _cimg_save_pandore_case(0,1,1,"int",6);
-      _cimg_save_pandore_case(0,1,1,"unsigned int64",6);
-      _cimg_save_pandore_case(0,1,1,"int64",6);
-      _cimg_save_pandore_case(0,1,1,"float",7);
-      _cimg_save_pandore_case(0,1,1,"double",7);
-
-      _cimg_save_pandore_case(0,0,1,"unsigned char",8);
-      _cimg_save_pandore_case(0,0,1,"char",9);
-      _cimg_save_pandore_case(0,0,1,"unsigned short",9);
-      _cimg_save_pandore_case(0,0,1,"short",9);
-      _cimg_save_pandore_case(0,0,1,"unsigned int",9);
-      _cimg_save_pandore_case(0,0,1,"int",9);
-      _cimg_save_pandore_case(0,0,1,"unsigned int64",9);
-      _cimg_save_pandore_case(0,0,1,"int64",9);
-      _cimg_save_pandore_case(0,0,1,"float",10);
-      _cimg_save_pandore_case(0,0,1,"double",10);
-
-      _cimg_save_pandore_case(0,1,3,"unsigned char",16);
-      _cimg_save_pandore_case(0,1,3,"char",17);
-      _cimg_save_pandore_case(0,1,3,"unsigned short",17);
-      _cimg_save_pandore_case(0,1,3,"short",17);
-      _cimg_save_pandore_case(0,1,3,"unsigned int",17);
-      _cimg_save_pandore_case(0,1,3,"int",17);
-      _cimg_save_pandore_case(0,1,3,"unsigned int64",17);
-      _cimg_save_pandore_case(0,1,3,"int64",17);
-      _cimg_save_pandore_case(0,1,3,"float",18);
-      _cimg_save_pandore_case(0,1,3,"double",18);
-
-      _cimg_save_pandore_case(0,0,3,"unsigned char",19);
-      _cimg_save_pandore_case(0,0,3,"char",20);
-      _cimg_save_pandore_case(0,0,3,"unsigned short",20);
-      _cimg_save_pandore_case(0,0,3,"short",20);
-      _cimg_save_pandore_case(0,0,3,"unsigned int",20);
-      _cimg_save_pandore_case(0,0,3,"int",20);
-      _cimg_save_pandore_case(0,0,3,"unsigned int64",20);
-      _cimg_save_pandore_case(0,0,3,"int64",20);
-      _cimg_save_pandore_case(0,0,3,"float",21);
-      _cimg_save_pandore_case(0,0,3,"double",21);
-
-      _cimg_save_pandore_case(1,1,0,"unsigned char",22);
-      _cimg_save_pandore_case(1,1,0,"char",23);
-      _cimg_save_pandore_case(1,1,0,"unsigned short",23);
-      _cimg_save_pandore_case(1,1,0,"short",23);
-      _cimg_save_pandore_case(1,1,0,"unsigned int",23);
-      _cimg_save_pandore_case(1,1,0,"int",23);
-      _cimg_save_pandore_case(1,1,0,"unsigned int64",23);
-      _cimg_save_pandore_case(1,1,0,"int64",23);
-      _cimg_save_pandore_case(1,1,0,"float",25);
-      _cimg_save_pandore_case(1,1,0,"double",25);
-
-      _cimg_save_pandore_case(0,1,0,"unsigned char",26);
-      _cimg_save_pandore_case(0,1,0,"char",27);
-      _cimg_save_pandore_case(0,1,0,"unsigned short",27);
-      _cimg_save_pandore_case(0,1,0,"short",27);
-      _cimg_save_pandore_case(0,1,0,"unsigned int",27);
-      _cimg_save_pandore_case(0,1,0,"int",27);
-      _cimg_save_pandore_case(0,1,0,"unsigned int64",27);
-      _cimg_save_pandore_case(0,1,0,"int64",27);
-      _cimg_save_pandore_case(0,1,0,"float",29);
-      _cimg_save_pandore_case(0,1,0,"double",29);
-
-      _cimg_save_pandore_case(0,0,0,"unsigned char",30);
-      _cimg_save_pandore_case(0,0,0,"char",31);
-      _cimg_save_pandore_case(0,0,0,"unsigned short",31);
-      _cimg_save_pandore_case(0,0,0,"short",31);
-      _cimg_save_pandore_case(0,0,0,"unsigned int",31);
-      _cimg_save_pandore_case(0,0,0,"int",31);
-      _cimg_save_pandore_case(0,0,0,"unsigned int64",31);
-      _cimg_save_pandore_case(0,0,0,"int64",31);
-      _cimg_save_pandore_case(0,0,0,"float",33);
-      _cimg_save_pandore_case(0,0,0,"double",33);
-
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a raw data file.
-    /**
-       \param filename Filename, as a C-string.
-       \param is_multiplexed Tells if the image channels are stored in a multiplexed way (\c true) or not (\c false).
-       \note The .raw format does not store the image dimensions in the output file,
-       so you have to keep track of them somewhere to be able to read the file correctly afterwards.
-    **/
-    const CImg<T>& save_raw(const char *const filename, const bool is_multiplexed=false) const {
-      return _save_raw(0,filename,is_multiplexed);
-    }
-
-    //! Save image as a raw data file \overloading.
-    /**
-       Same as save_raw(const char *,bool) const
-       with a file stream argument instead of a filename string.
-    **/
-    const CImg<T>& save_raw(std::FILE *const file, const bool is_multiplexed=false) const {
-      return _save_raw(file,0,is_multiplexed);
-    }
-
-    const CImg<T>& _save_raw(std::FILE *const file, const char *const filename, const bool is_multiplexed) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_raw(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      if (!is_multiplexed) cimg::fwrite(_data,size(),nfile);
-      else {
-        CImg<T> buf(_spectrum);
-        cimg_forXYZ(*this,x,y,z) {
-          cimg_forC(*this,c) buf[c] = (*this)(x,y,z,c);
-          cimg::fwrite(buf._data,_spectrum,nfile);
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save image as a .yuv video file.
-    /**
-       \param filename Filename, as a C-string.
-       \param is_rgb Tells if pixel values of the instance image are RGB-coded (\c true) or YUV-coded (\c false).
-       \note Each slice of the instance image is considered to be a single frame of the output video file.
-    **/
-    const CImg<T>& save_yuv(const char *const filename, const bool is_rgb=true) const {
-      get_split('z').save_yuv(filename,is_rgb);
-      return *this;
-    }
-
-    //! Save image as a .yuv video file \overloading.
-    /**
-       Same as save_yuv(const char*,bool) const
-       with a file stream argument instead of a filename string.
-    **/
-    const CImg<T>& save_yuv(std::FILE *const file, const bool is_rgb=true) const {
-      get_split('z').save_yuv(file,is_rgb);
-      return *this;
-    }
-
-    //! Save 3d object as an Object File Format (.off) file.
-    /**
-       \param filename Filename, as a C-string.
-       \param primitives List of 3d object primitives.
-       \param colors List of 3d object colors.
-       \note
-       - Instance image contains the vertices data of the 3d object.
-       - Textured, transparent or sphere-shaped primitives cannot be managed by the .off file format.
-       Such primitives will be lost or simplified during file saving.
-       - The .off file format is <a href="http://people.sc.fsu.edu/~jburkardt/html/off_format.html">described here</a>.
-    **/
-    template<typename tf, typename tc>
-    const CImg<T>& save_off(const CImgList<tf>& primitives, const CImgList<tc>& colors,
-                            const char *const filename) const {
-      return _save_off(primitives,colors,0,filename);
-    }
-
-    //! Save 3d object as an Object File Format (.off) file \overloading.
-    /**
-       Same as save_off(const CImgList<tf>&,const CImgList<tc>&,const char*) const
-       with a file stream argument instead of a filename string.
-    **/
-    template<typename tf, typename tc>
-    const CImg<T>& save_off(const CImgList<tf>& primitives, const CImgList<tc>& colors,
-                            std::FILE *const file) const {
-      return _save_off(primitives,colors,file,0);
-    }
-
-    template<typename tf, typename tc>
-    const CImg<T>& _save_off(const CImgList<tf>& primitives, const CImgList<tc>& colors,
-                             std::FILE *const file, const char *const filename) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_off(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty())
-        throw CImgInstanceException(_cimg_instance
-                                    "save_off(): Empty instance, for file '%s'.",
-                                    cimg_instance,
-                                    filename?filename:"(FILE*)");
-
-      CImgList<T> opacities;
-      CImg<charT> error_message(1024);
-      if (!is_object3d(primitives,colors,opacities,true,error_message))
-        throw CImgInstanceException(_cimg_instance
-                                    "save_off(): Invalid specified 3d object, for file '%s' (%s).",
-                                    cimg_instance,
-                                    filename?filename:"(FILE*)",error_message.data());
-
-      const CImg<tc> default_color(1,3,1,1,200);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
-      unsigned int supported_primitives = 0;
-      cimglist_for(primitives,l) if (primitives[l].size()!=5) ++supported_primitives;
-      std::fprintf(nfile,"OFF\n%u %u %u\n",_width,supported_primitives,3*primitives._width);
-      cimg_forX(*this,i) std::fprintf(nfile,"%f %f %f\n",
-                                      (float)((*this)(i,0)),(float)((*this)(i,1)),(float)((*this)(i,2)));
-      cimglist_for(primitives,l) {
-        const CImg<tc>& color = l<colors.width()?colors[l]:default_color;
-        const unsigned int psiz = primitives[l].size(), csiz = color.size();
-        const float r = color[0]/255.0f, g = (csiz>1?color[1]:r)/255.0f, b = (csiz>2?color[2]:g)/255.0f;
-        switch (psiz) {
-        case 1 : std::fprintf(nfile,"1 %u %f %f %f\n",
-                              (unsigned int)primitives(l,0),r,g,b); break;
-        case 2 : std::fprintf(nfile,"2 %u %u %f %f %f\n",
-                              (unsigned int)primitives(l,0),(unsigned int)primitives(l,1),r,g,b); break;
-        case 3 : std::fprintf(nfile,"3 %u %u %u %f %f %f\n",
-                              (unsigned int)primitives(l,0),(unsigned int)primitives(l,2),
-                              (unsigned int)primitives(l,1),r,g,b); break;
-        case 4 : std::fprintf(nfile,"4 %u %u %u %u %f %f %f\n",
-                              (unsigned int)primitives(l,0),(unsigned int)primitives(l,3),
-                              (unsigned int)primitives(l,2),(unsigned int)primitives(l,1),r,g,b); break;
-        case 5 : std::fprintf(nfile,"2 %u %u %f %f %f\n",
-                              (unsigned int)primitives(l,0),(unsigned int)primitives(l,1),r,g,b); break;
-        case 6 : {
-          const unsigned int xt = (unsigned int)primitives(l,2), yt = (unsigned int)primitives(l,3);
-          const float
-            rt = color.atXY(xt,yt,0)/255.0f,
-            gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f,
-            bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
-          std::fprintf(nfile,"2 %u %u %f %f %f\n",
-                       (unsigned int)primitives(l,0),(unsigned int)primitives(l,1),rt,gt,bt);
-        } break;
-        case 9 : {
-          const unsigned int xt = (unsigned int)primitives(l,3), yt = (unsigned int)primitives(l,4);
-          const float
-            rt = color.atXY(xt,yt,0)/255.0f,
-            gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f,
-            bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
-          std::fprintf(nfile,"3 %u %u %u %f %f %f\n",
-                       (unsigned int)primitives(l,0),(unsigned int)primitives(l,2),
-                       (unsigned int)primitives(l,1),rt,gt,bt);
-        } break;
-        case 12 : {
-          const unsigned int xt = (unsigned int)primitives(l,4), yt = (unsigned int)primitives(l,5);
-          const float
-            rt = color.atXY(xt,yt,0)/255.0f,
-            gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f,
-            bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
-          std::fprintf(nfile,"4 %u %u %u %u %f %f %f\n",
-                       (unsigned int)primitives(l,0),(unsigned int)primitives(l,3),
-                       (unsigned int)primitives(l,2),(unsigned int)primitives(l,1),rt,gt,bt);
-        } break;
-        }
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save volumetric image as a video, using the OpenCV library.
-    /**
-      \param filename Filename to write data to.
-      \param fps Number of frames per second.
-      \param codec Type of compression (See http://www.fourcc.org/codecs.php to see available codecs).
-      \param keep_open Tells if the video writer associated to the specified filename
-        must be kept open or not (to allow frames to be added in the same file afterwards).
-    **/
-    const CImg<T>& save_video(const char *const filename, const unsigned int fps=25,
-                              const char *codec=0, const bool keep_open=false) const {
-      if (is_empty()) { CImgList<T>().save_video(filename,fps,codec,keep_open); return *this; }
-      CImgList<T> list;
-      get_split('z').move_to(list);
-      list.save_video(filename,fps,codec,keep_open);
-      return *this;
-    }
-
-    //! Save volumetric image as a video, using ffmpeg external binary.
-    /**
-       \param filename Filename, as a C-string.
-       \param fps Video framerate.
-       \param codec Video codec, as a C-string.
-       \param bitrate Video bitrate.
-       \note
-       - Each slice of the instance image is considered to be a single frame of the output video file.
-       - This method uses \c ffmpeg, an external executable binary provided by
-         <a href="http://www.ffmpeg.org">FFmpeg</a>.
-       It must be installed for the method to succeed.
-    **/
-    const CImg<T>& save_ffmpeg_external(const char *const filename, const unsigned int fps=25,
-                                        const char *const codec=0, const unsigned int bitrate=2048) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_ffmpeg_external(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-      CImgList<T> list;
-      get_split('z').move_to(list);
-      list.save_ffmpeg_external(filename,fps,codec,bitrate);
-      return *this;
-    }
-
-    //! Save image using gzip external binary.
-    /**
-       \param filename Filename, as a C-string.
-       \note This method uses \c gzip, an external executable binary provided by
-         <a href="//http://www.gzip.org">gzip</a>.
-       It must be installed for the method to succeed.
-    **/
-    const CImg<T>& save_gzip_external(const char *const filename) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_gzip_external(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      const char
-        *ext = cimg::split_filename(filename,body),
-        *ext2 = cimg::split_filename(body,0);
-      std::FILE *file;
-      do {
-        if (!cimg::strcasecmp(ext,"gz")) {
-          if (*ext2) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                   cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.cimg",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        } else {
-          if (*ext) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                  cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.cimg",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        }
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      save(filename_tmp);
-      cimg_snprintf(command,command._width,"%s -c \"%s\" > \"%s\"",
-                    cimg::gzip_path(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    CImg<charT>::string(filename)._system_strescape().data());
-      cimg::system(command);
-      file = std_fopen(filename,"rb");
-      if (!file)
-        throw CImgIOException(_cimg_instance
-                              "save_gzip_external(): Failed to save file '%s' with external command 'gzip'.",
-                              cimg_instance,
-                              filename);
-
-      else cimg::fclose(file);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Save image using GraphicsMagick's external binary.
-    /**
-       \param filename Filename, as a C-string.
-       \param quality Image quality (expressed in percent), when the file format supports it.
-       \note This method uses \c gm, an external executable binary provided by
-         <a href="http://www.graphicsmagick.org">GraphicsMagick</a>.
-       It must be installed for the method to succeed.
-    **/
-    const CImg<T>& save_graphicsmagick_external(const char *const filename, const unsigned int quality=100) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_graphicsmagick_external(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_other(): File '%s', saving a volumetric image with an external call to "
-                   "GraphicsMagick only writes the first image slice.",
-                   cimg_instance,filename);
-
-#ifdef cimg_use_png
-#define _cimg_sge_ext1 "png"
-#define _cimg_sge_ext2 "png"
-#else
-#define _cimg_sge_ext1 "pgm"
-#define _cimg_sge_ext2 "ppm"
-#endif
-      CImg<charT> command(1024), filename_tmp(256);
-      std::FILE *file;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),
-                      _spectrum==1?_cimg_sge_ext1:_cimg_sge_ext2);
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-#ifdef cimg_use_png
-      save_png(filename_tmp);
-#else
-      save_pnm(filename_tmp);
-#endif
-      cimg_snprintf(command,command._width,"%s convert -quality %u \"%s\" \"%s\"",
-                    cimg::graphicsmagick_path(),quality,
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    CImg<charT>::string(filename)._system_strescape().data());
-      cimg::system(command);
-      file = std_fopen(filename,"rb");
-      if (!file)
-        throw CImgIOException(_cimg_instance
-                              "save_graphicsmagick_external(): Failed to save file '%s' with external command 'gm'.",
-                              cimg_instance,
-                              filename);
-
-      if (file) cimg::fclose(file);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Save image using ImageMagick's external binary.
-    /**
-       \param filename Filename, as a C-string.
-       \param quality Image quality (expressed in percent), when the file format supports it.
-       \note This method uses \c convert, an external executable binary provided by
-       <a href="http://www.imagemagick.org">ImageMagick</a>.
-       It must be installed for the method to succeed.
-    **/
-    const CImg<T>& save_imagemagick_external(const char *const filename, const unsigned int quality=100) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_imagemagick_external(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_other(): File '%s', saving a volumetric image with an external call to "
-                   "ImageMagick only writes the first image slice.",
-                   cimg_instance,filename);
-#ifdef cimg_use_png
-#define _cimg_sie_ext1 "png"
-#define _cimg_sie_ext2 "png"
-#else
-#define _cimg_sie_ext1 "pgm"
-#define _cimg_sie_ext2 "ppm"
-#endif
-      CImg<charT> command(1024), filename_tmp(256);
-      std::FILE *file;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",cimg::temporary_path(),
-                      cimg_file_separator,cimg::filenamerand(),_spectrum==1?_cimg_sie_ext1:_cimg_sie_ext2);
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-#ifdef cimg_use_png
-      save_png(filename_tmp);
-#else
-      save_pnm(filename_tmp);
-#endif
-      cimg_snprintf(command,command._width,"%s -quality %u \"%s\" \"%s\"",
-                    cimg::imagemagick_path(),quality,
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    CImg<charT>::string(filename)._system_strescape().data());
-      cimg::system(command);
-      file = std_fopen(filename,"rb");
-      if (!file)
-        throw CImgIOException(_cimg_instance
-                              "save_imagemagick_external(): Failed to save file '%s' with external command 'convert'.",
-                              cimg_instance,
-                              filename);
-
-      if (file) cimg::fclose(file);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Save image as a Dicom file.
-    /**
-       \param filename Filename, as a C-string.
-       \note This method uses \c medcon, an external executable binary provided by
-         <a href="http://xmedcon.sourceforge.net">(X)Medcon</a>.
-       It must be installed for the method to succeed.
-    **/
-    const CImg<T>& save_medcon_external(const char *const filename) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_medcon_external(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      std::FILE *file;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s.hdr",cimg::filenamerand());
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      save_analyze(filename_tmp);
-      cimg_snprintf(command,command._width,"%s -w -c dicom -o \"%s\" -f \"%s\"",
-                    cimg::medcon_path(),
-                    CImg<charT>::string(filename)._system_strescape().data(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command);
-      std::remove(filename_tmp);
-      cimg::split_filename(filename_tmp,body);
-      cimg_snprintf(filename_tmp,filename_tmp._width,"%s.img",body._data);
-      std::remove(filename_tmp);
-
-      file = std_fopen(filename,"rb");
-      if (!file) {
-        cimg_snprintf(command,command._width,"m000-%s",filename);
-        file = std_fopen(command,"rb");
-        if (!file) {
-          cimg::fclose(cimg::fopen(filename,"r"));
-          throw CImgIOException(_cimg_instance
-                                "save_medcon_external(): Failed to save file '%s' with external command 'medcon'.",
-                                cimg_instance,
-                                filename);
-        }
-      }
-      cimg::fclose(file);
-      std::rename(command,filename);
-      return *this;
-    }
-
-    // Save image for non natively supported formats.
-    /**
-       \param filename Filename, as a C-string.
-       \param quality Image quality (expressed in percent), when the file format supports it.
-       \note
-       - The filename extension tells about the desired file format.
-       - This method tries to save the instance image as a file, using external tools from
-       <a href="http://www.imagemagick.org">ImageMagick</a> or
-       <a href="http://www.graphicsmagick.org">GraphicsMagick</a>.
-         At least one of these tool must be installed for the method to succeed.
-       - It is recommended to use the generic method save(const char*, int) const instead,
-         as it can handle some file formats natively.
-    **/
-    const CImg<T>& save_other(const char *const filename, const unsigned int quality=100) const {
-      if (!filename)
-        throw CImgArgumentException(_cimg_instance
-                                    "save_other(): Specified filename is (null).",
-                                    cimg_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-      if (_depth>1)
-        cimg::warn(_cimg_instance
-                   "save_other(): File '%s', saving a volumetric image with an external call to "
-                   "ImageMagick or GraphicsMagick only writes the first image slice.",
-                   cimg_instance,filename);
-
-      const unsigned int omode = cimg::exception_mode();
-      bool is_saved = true;
-      cimg::exception_mode(0);
-      try { save_magick(filename); }
-      catch (CImgException&) {
-        try { save_imagemagick_external(filename,quality); }
-        catch (CImgException&) {
-          try { save_graphicsmagick_external(filename,quality); }
-          catch (CImgException&) {
-            is_saved = false;
-          }
-        }
-      }
-      cimg::exception_mode(omode);
-      if (!is_saved)
-        throw CImgIOException(_cimg_instance
-                              "save_other(): Failed to save file '%s'. Format is not natively supported, "
-                              "and no external commands succeeded.",
-                              cimg_instance,
-                              filename);
-      return *this;
-    }
-
-    //! Serialize a CImg<T> instance into a raw CImg<unsigned char> buffer.
-    /**
-       \param is_compressed tells if zlib compression must be used for serialization
-       (this requires 'cimg_use_zlib' been enabled).
-    **/
-    CImg<ucharT> get_serialize(const bool is_compressed=false) const {
-      return CImgList<T>(*this,true).get_serialize(is_compressed);
-    }
-
-    // [internal] Return a 40x38 color logo of a 'danger' item.
-    static CImg<T> _logo40x38() {
-      CImg<T> res(40,38,1,3);
-      const unsigned char *ptrs = cimg::logo40x38;
-      T *ptr1 = res.data(0,0,0,0), *ptr2 = res.data(0,0,0,1), *ptr3 = res.data(0,0,0,2);
-      for (ulongT off = 0; off<(ulongT)res._width*res._height;) {
-        const unsigned char n = *(ptrs++), r = *(ptrs++), g = *(ptrs++), b = *(ptrs++);
-        for (unsigned int l = 0; l<n; ++off, ++l) { *(ptr1++) = (T)r; *(ptr2++) = (T)g; *(ptr3++) = (T)b; }
-      }
-      return res;
-    }
-
-    //@}
-  };
-
-  /*
-   #-----------------------------------------
-   #
-   #
-   #
-   # Definition of the CImgList<T> structure
-   #
-   #
-   #
-   #------------------------------------------
-   */
-  //! Represent a list of images CImg<T>.
-  template<typename T>
-  struct CImgList {
-    unsigned int _width, _allocated_width;
-    CImg<T> *_data;
-
-    //! Simple iterator type, to loop through each image of a list.
-    /**
-       \note
-       - The \c CImgList<T>::iterator type is defined as a <tt>CImg<T>*</tt>.
-       - You may use it like this:
-       \code
-       CImgList<> list;   // Assuming this image list is not empty.
-       for (CImgList<>::iterator it = list.begin(); it<list.end(); ++it) (*it).mirror('x');
-       \endcode
-       - Using the loop macro \c cimglist_for is another (more concise) alternative:
-       \code
-       cimglist_for(list,l) list[l].mirror('x');
-       \endcode
-    **/
-    typedef CImg<T>* iterator;
-
-    //! Simple const iterator type, to loop through each image of a \c const list instance.
-    /**
-       \note
-       - The \c CImgList<T>::const_iterator type is defined to be a <tt>const CImg<T>*</tt>.
-       - Similar to CImgList<T>::iterator, but for constant list instances.
-    **/
-    typedef const CImg<T>* const_iterator;
-
-    //! Pixel value type.
-    /**
-       Refer to the pixels value type of the images in the list.
-       \note
-       - The \c CImgList<T>::value_type type of a \c CImgList<T> is defined to be a \c T.
-         It is then similar to CImg<T>::value_type.
-       - \c CImgList<T>::value_type is actually not used in %CImg methods. It has been mainly defined for
-         compatibility with STL naming conventions.
-    **/
-    typedef T value_type;
-
-    // Define common types related to template type T.
-    typedef typename cimg::superset<T,bool>::type Tbool;
-    typedef typename cimg::superset<T,unsigned char>::type Tuchar;
-    typedef typename cimg::superset<T,char>::type Tchar;
-    typedef typename cimg::superset<T,unsigned short>::type Tushort;
-    typedef typename cimg::superset<T,short>::type Tshort;
-    typedef typename cimg::superset<T,unsigned int>::type Tuint;
-    typedef typename cimg::superset<T,int>::type Tint;
-    typedef typename cimg::superset<T,cimg_ulong>::type Tulong;
-    typedef typename cimg::superset<T,cimg_long>::type Tlong;
-    typedef typename cimg::superset<T,float>::type Tfloat;
-    typedef typename cimg::superset<T,double>::type Tdouble;
-    typedef typename cimg::last<T,bool>::type boolT;
-    typedef typename cimg::last<T,unsigned char>::type ucharT;
-    typedef typename cimg::last<T,char>::type charT;
-    typedef typename cimg::last<T,unsigned short>::type ushortT;
-    typedef typename cimg::last<T,short>::type shortT;
-    typedef typename cimg::last<T,unsigned int>::type uintT;
-    typedef typename cimg::last<T,int>::type intT;
-    typedef typename cimg::last<T,cimg_ulong>::type ulongT;
-    typedef typename cimg::last<T,cimg_long>::type longT;
-    typedef typename cimg::last<T,cimg_uint64>::type uint64T;
-    typedef typename cimg::last<T,cimg_int64>::type int64T;
-    typedef typename cimg::last<T,float>::type floatT;
-    typedef typename cimg::last<T,double>::type doubleT;
-
-    //@}
-    //---------------------------
-    //
-    //! \name Plugins
-    //@{
-    //---------------------------
-#ifdef cimglist_plugin
-#include cimglist_plugin
-#endif
-#ifdef cimglist_plugin1
-#include cimglist_plugin1
-#endif
-#ifdef cimglist_plugin2
-#include cimglist_plugin2
-#endif
-#ifdef cimglist_plugin3
-#include cimglist_plugin3
-#endif
-#ifdef cimglist_plugin4
-#include cimglist_plugin4
-#endif
-#ifdef cimglist_plugin5
-#include cimglist_plugin5
-#endif
-#ifdef cimglist_plugin6
-#include cimglist_plugin6
-#endif
-#ifdef cimglist_plugin7
-#include cimglist_plugin7
-#endif
-#ifdef cimglist_plugin8
-#include cimglist_plugin8
-#endif
-
-    //@}
-    //--------------------------------------------------------
-    //
-    //! \name Constructors / Destructor / Instance Management
-    //@{
-    //--------------------------------------------------------
-
-    //! Destructor.
-    /**
-       Destroy current list instance.
-       \note
-       - Any allocated buffer is deallocated.
-       - Destroying an empty list does nothing actually.
-     **/
-    ~CImgList() {
-      delete[] _data;
-    }
-
-    //! Default constructor.
-    /**
-       Construct a new empty list instance.
-       \note
-       - An empty list has no pixel data and its dimension width() is set to \c 0, as well as its
-         image buffer pointer data().
-       - An empty list may be reassigned afterwards, with the family of the assign() methods.
-         In all cases, the type of pixels stays \c T.
-     **/
-    CImgList():
-      _width(0),_allocated_width(0),_data(0) {}
-
-    //! Construct list containing empty images.
-    /**
-       \param n Number of empty images.
-       \note Useful when you know by advance the number of images you want to manage, as
-       it will allocate the right amount of memory for the list, without needs for reallocation
-       (that may occur when starting from an empty list and inserting several images in it).
-    **/
-    explicit CImgList(const unsigned int n):_width(n) {
-      if (n) _data = new CImg<T>[_allocated_width = std::max(16U,(unsigned int)cimg::nearest_pow2(n))];
-      else { _allocated_width = 0; _data = 0; }
-    }
-
-    //! Construct list containing images of specified size.
-    /**
-       \param n Number of images.
-       \param width Width of images.
-       \param height Height of images.
-       \param depth Depth of images.
-       \param spectrum Number of channels of images.
-       \note Pixel values are not initialized and may probably contain garbage.
-    **/
-    CImgList(const unsigned int n, const unsigned int width, const unsigned int height=1,
-             const unsigned int depth=1, const unsigned int spectrum=1):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(n);
-      cimglist_apply(*this,assign)(width,height,depth,spectrum);
-    }
-
-    //! Construct list containing images of specified size, and initialize pixel values.
-    /**
-       \param n Number of images.
-       \param width Width of images.
-       \param height Height of images.
-       \param depth Depth of images.
-       \param spectrum Number of channels of images.
-       \param val Initialization value for images pixels.
-    **/
-    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
-             const unsigned int depth, const unsigned int spectrum, const T& val):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(n);
-      cimglist_apply(*this,assign)(width,height,depth,spectrum,val);
-    }
-
-    //! Construct list containing images of specified size, and initialize pixel values from a sequence of integers.
-    /**
-       \param n Number of images.
-       \param width Width of images.
-       \param height Height of images.
-       \param depth Depth of images.
-       \param spectrum Number of channels of images.
-       \param val0 First value of the initializing integers sequence.
-       \param val1 Second value of the initializing integers sequence.
-       \warning You must specify at least <tt>width*height*depth*spectrum</tt> values in your argument list,
-         or you will probably segfault.
-    **/
-    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
-             const unsigned int depth, const unsigned int spectrum, const int val0, const int val1, ...):
-      _width(0),_allocated_width(0),_data(0) {
-#define _CImgList_stdarg(t) { \
-        assign(n,width,height,depth,spectrum); \
-        const ulongT siz = (ulongT)width*height*depth*spectrum, nsiz = siz*n; \
-        T *ptrd = _data->_data; \
-        va_list ap; \
-        va_start(ap,val1); \
-        for (ulongT l = 0, s = 0, i = 0; i<nsiz; ++i) { \
-          *(ptrd++) = (T)(i==0?val0:(i==1?val1:va_arg(ap,t))); \
-          if ((++s)==siz) { ptrd = _data[++l]._data; s = 0; } \
-        } \
-        va_end(ap); \
-      }
-      _CImgList_stdarg(int);
-    }
-
-    //! Construct list containing images of specified size, and initialize pixel values from a sequence of doubles.
-    /**
-       \param n Number of images.
-       \param width Width of images.
-       \param height Height of images.
-       \param depth Depth of images.
-       \param spectrum Number of channels of images.
-       \param val0 First value of the initializing doubles sequence.
-       \param val1 Second value of the initializing doubles sequence.
-       \warning You must specify at least <tt>width*height*depth*spectrum</tt> values in your argument list,
-         or you will probably segfault.
-    **/
-    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
-             const unsigned int depth, const unsigned int spectrum, const double val0, const double val1, ...):
-      _width(0),_allocated_width(0),_data(0) {
-      _CImgList_stdarg(double);
-    }
-
-    //! Construct list containing copies of an input image.
-    /**
-       \param n Number of images.
-       \param img Input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of \c img.
-    **/
-    template<typename t>
-    CImgList(const unsigned int n, const CImg<t>& img, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(n);
-      cimglist_apply(*this,assign)(img,is_shared);
-    }
-
-    //! Construct list from one image.
-    /**
-       \param img Input image to copy in the constructed list.
-       \param is_shared Tells if the element of the list is a shared or non-shared copy of \c img.
-     **/
-    template<typename t>
-    explicit CImgList(const CImg<t>& img, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(1);
-      _data[0].assign(img,is_shared);
-    }
-
-    //! Construct list from two images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-     **/
-    template<typename t1, typename t2>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(2);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared);
-    }
-
-    //! Construct list from three images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(3);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-    }
-
-    //! Construct list from four images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param img4 Fourth input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3, typename t4>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-             const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(4);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared);
-    }
-
-    //! Construct list from five images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param img4 Fourth input image to copy in the constructed list.
-       \param img5 Fifth input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-             const CImg<t5>& img5, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(5);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared);
-    }
-
-    //! Construct list from six images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param img4 Fourth input image to copy in the constructed list.
-       \param img5 Fifth input image to copy in the constructed list.
-       \param img6 Sixth input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-             const CImg<t5>& img5, const CImg<t6>& img6, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(6);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-    }
-
-    //! Construct list from seven images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param img4 Fourth input image to copy in the constructed list.
-       \param img5 Fifth input image to copy in the constructed list.
-       \param img6 Sixth input image to copy in the constructed list.
-       \param img7 Seventh input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-             const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(7);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-      _data[6].assign(img7,is_shared);
-    }
-
-    //! Construct list from eight images.
-    /**
-       \param img1 First input image to copy in the constructed list.
-       \param img2 Second input image to copy in the constructed list.
-       \param img3 Third input image to copy in the constructed list.
-       \param img4 Fourth input image to copy in the constructed list.
-       \param img5 Fifth input image to copy in the constructed list.
-       \param img6 Sixth input image to copy in the constructed list.
-       \param img7 Seventh input image to copy in the constructed list.
-       \param img8 Eighth input image to copy in the constructed list.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7, typename t8>
-    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-             const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const CImg<t8>& img8,
-             const bool is_shared=false):
-      _width(0),_allocated_width(0),_data(0) {
-      assign(8);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-      _data[6].assign(img7,is_shared); _data[7].assign(img8,is_shared);
-    }
-
-    //! Construct list copy.
-    /**
-       \param list Input list to copy.
-       \note The shared state of each element of the constructed list is kept the same as in \c list.
-    **/
-    template<typename t>
-    CImgList(const CImgList<t>& list):_width(0),_allocated_width(0),_data(0) {
-      assign(list._width);
-      cimglist_for(*this,l) _data[l].assign(list[l],false);
-    }
-
-    //! Construct list copy \specialization.
-    CImgList(const CImgList<T>& list):_width(0),_allocated_width(0),_data(0) {
-      assign(list._width);
-      cimglist_for(*this,l) _data[l].assign(list[l],list[l]._is_shared);
-    }
-
-    //! Construct list copy, and force the shared state of the list elements.
-    /**
-       \param list Input list to copy.
-       \param is_shared Tells if the elements of the list are shared or non-shared copies of input images.
-    **/
-    template<typename t>
-    CImgList(const CImgList<t>& list, const bool is_shared):_width(0),_allocated_width(0),_data(0) {
-      assign(list._width);
-      cimglist_for(*this,l) _data[l].assign(list[l],is_shared);
-    }
-
-    //! Construct list by reading the content of a file.
-    /**
-       \param filename Filename, as a C-string.
-    **/
-    explicit CImgList(const char *const filename):_width(0),_allocated_width(0),_data(0) {
-      assign(filename);
-    }
-
-    //! Construct list from the content of a display window.
-    /**
-       \param disp Display window to get content from.
-       \note Constructed list contains a single image only.
-    **/
-    explicit CImgList(const CImgDisplay& disp):_width(0),_allocated_width(0),_data(0) {
-      assign(disp);
-    }
-
-    //! Return a list with elements being shared copies of images in the list instance.
-    /**
-      \note <tt>list2 = list1.get_shared()</tt> is equivalent to <tt>list2.assign(list1,true)</tt>.
-    **/
-    CImgList<T> get_shared() {
-      CImgList<T> res(_width);
-      cimglist_for(*this,l) res[l].assign(_data[l],true);
-      return res;
-    }
-
-    //! Return a list with elements being shared copies of images in the list instance \const.
-    const CImgList<T> get_shared() const {
-      CImgList<T> res(_width);
-      cimglist_for(*this,l) res[l].assign(_data[l],true);
-      return res;
-    }
-
-    //! Destructor \inplace.
-    /**
-       \see CImgList().
-    **/
-    CImgList<T>& assign() {
-      delete[] _data;
-      _width = _allocated_width = 0;
-      _data = 0;
-      return *this;
-    }
-
-    //! Destructor \inplace.
-    /**
-       Equivalent to assign().
-       \note Only here for compatibility with STL naming conventions.
-    **/
-    CImgList<T>& clear() {
-      return assign();
-    }
-
-    //! Construct list containing empty images \inplace.
-    /**
-       \see CImgList(unsigned int).
-    **/
-    CImgList<T>& assign(const unsigned int n) {
-      if (!n) return assign();
-      if (_allocated_width<n || _allocated_width>(n<<2)) {
-        delete[] _data;
-        _data = new CImg<T>[_allocated_width = std::max(16U,(unsigned int)cimg::nearest_pow2(n))];
-      }
-      _width = n;
-      return *this;
-    }
-
-    //! Construct list containing images of specified size \inplace.
-    /**
-       \see CImgList(unsigned int, unsigned int, unsigned int, unsigned int, unsigned int).
-    **/
-    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height=1,
-                        const unsigned int depth=1, const unsigned int spectrum=1) {
-      assign(n);
-      cimglist_apply(*this,assign)(width,height,depth,spectrum);
-      return *this;
-    }
-
-    //! Construct list containing images of specified size, and initialize pixel values \inplace.
-    /**
-       \see CImgList(unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, const T).
-    **/
-    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
-                        const unsigned int depth, const unsigned int spectrum, const T& val) {
-      assign(n);
-      cimglist_apply(*this,assign)(width,height,depth,spectrum,val);
-      return *this;
-    }
-
-    //! Construct list with images of specified size, and initialize pixel values from a sequence of integers \inplace.
-    /**
-       \see CImgList(unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, const int, const int, ...).
-    **/
-    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
-                        const unsigned int depth, const unsigned int spectrum, const int val0, const int val1, ...) {
-      _CImgList_stdarg(int);
-      return *this;
-    }
-
-    //! Construct list with images of specified size, and initialize pixel values from a sequence of doubles \inplace.
-    /**
-       \see CImgList(unsigned int,unsigned int,unsigned int,unsigned int,unsigned int,const double,const double,...).
-    **/
-    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
-                        const unsigned int depth, const unsigned int spectrum,
-                        const double val0, const double val1, ...) {
-      _CImgList_stdarg(double);
-      return *this;
-    }
-
-    //! Construct list containing copies of an input image \inplace.
-    /**
-       \see CImgList(unsigned int, const CImg<t>&, bool).
-    **/
-    template<typename t>
-    CImgList<T>& assign(const unsigned int n, const CImg<t>& img, const bool is_shared=false) {
-      assign(n);
-      cimglist_apply(*this,assign)(img,is_shared);
-      return *this;
-    }
-
-    //! Construct list from one image \inplace.
-    /**
-       \see CImgList(const CImg<t>&, bool).
-    **/
-    template<typename t>
-    CImgList<T>& assign(const CImg<t>& img, const bool is_shared=false) {
-      assign(1);
-      _data[0].assign(img,is_shared);
-      return *this;
-    }
-
-    //! Construct list from two images \inplace.
-    /**
-       \see CImgList(const CImg<t>&, const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const bool is_shared=false) {
-      assign(2);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared);
-      return *this;
-    }
-
-    //! Construct list from three images \inplace.
-    /**
-       \see CImgList(const CImg<t>&, const CImg<t>&, const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const bool is_shared=false) {
-      assign(3);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      return *this;
-    }
-
-    //! Construct list from four images \inplace.
-    /**
-       \see CImgList(const CImg<t>&, const CImg<t>&, const CImg<t>&, const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3, typename t4>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-                        const bool is_shared=false) {
-      assign(4);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared);
-      return *this;
-    }
-
-    //! Construct list from five images \inplace.
-    /**
-       \see CImgList(const CImg<t>&, const CImg<t>&, const CImg<t>&, const CImg<t>&, const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-                        const CImg<t5>& img5, const bool is_shared=false) {
-      assign(5);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared);
-      return *this;
-    }
-
-    //! Construct list from six images \inplace.
-    /**
-       \see CImgList(const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-                        const CImg<t5>& img5, const CImg<t6>& img6, const bool is_shared=false) {
-      assign(6);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-      return *this;
-    }
-
-    //! Construct list from seven images \inplace.
-    /**
-       \see CImgList(const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,
-       const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-                        const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const bool is_shared=false) {
-      assign(7);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-      _data[6].assign(img7,is_shared);
-      return *this;
-    }
-
-    //! Construct list from eight images \inplace.
-    /**
-       \see CImgList(const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,const CImg<t>&,
-       const CImg<t>&, const CImg<t>&, bool).
-    **/
-    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7, typename t8>
-    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
-                        const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const CImg<t8>& img8,
-                        const bool is_shared=false) {
-      assign(8);
-      _data[0].assign(img1,is_shared); _data[1].assign(img2,is_shared); _data[2].assign(img3,is_shared);
-      _data[3].assign(img4,is_shared); _data[4].assign(img5,is_shared); _data[5].assign(img6,is_shared);
-      _data[6].assign(img7,is_shared); _data[7].assign(img8,is_shared);
-      return *this;
-    }
-
-    //! Construct list as a copy of an existing list and force the shared state of the list elements \inplace.
-    /**
-      \see CImgList(const CImgList<t>&, bool is_shared).
-    **/
-    template<typename t>
-    CImgList<T>& assign(const CImgList<t>& list, const bool is_shared=false) {
-      cimg::unused(is_shared);
-      assign(list._width);
-      cimglist_for(*this,l) _data[l].assign(list[l],false);
-      return *this;
-    }
-
-    //! Construct list as a copy of an existing list and force shared state of elements \inplace \specialization.
-    CImgList<T>& assign(const CImgList<T>& list, const bool is_shared=false) {
-      if (this==&list) return *this;
-      CImgList<T> res(list._width);
-      cimglist_for(res,l) res[l].assign(list[l],is_shared);
-      return res.move_to(*this);
-    }
-
-    //! Construct list by reading the content of a file \inplace.
-    /**
-      \see CImgList(const char *const).
-    **/
-    CImgList<T>& assign(const char *const filename) {
-      return load(filename);
-    }
-
-    //! Construct list from the content of a display window \inplace.
-    /**
-      \see CImgList(const CImgDisplay&).
-    **/
-    CImgList<T>& assign(const CImgDisplay &disp) {
-      return assign(CImg<T>(disp));
-    }
-
-    //! Transfer the content of the list instance to another list.
-    /**
-       \param list Destination list.
-       \note When returning, the current list instance is empty and the initial content of \c list is destroyed.
-    **/
-    template<typename t>
-    CImgList<t>& move_to(CImgList<t>& list) {
-      list.assign(_width);
-      bool is_one_shared_element = false;
-      cimglist_for(*this,l) is_one_shared_element|=_data[l]._is_shared;
-      if (is_one_shared_element) cimglist_for(*this,l) list[l].assign(_data[l]);
-      else cimglist_for(*this,l) _data[l].move_to(list[l]);
-      assign();
-      return list;
-    }
-
-    //! Transfer the content of the list instance at a specified position in another list.
-    /**
-       \param list Destination list.
-       \param pos Index of the insertion in the list.
-       \note When returning, the list instance is empty and the initial content of \c list is preserved
-       (only images indexes may be modified).
-     **/
-    template<typename t>
-    CImgList<t>& move_to(CImgList<t>& list, const unsigned int pos) {
-      if (is_empty()) return list;
-      const unsigned int npos = pos>list._width?list._width:pos;
-      list.insert(_width,npos);
-      bool is_one_shared_element = false;
-      cimglist_for(*this,l) is_one_shared_element|=_data[l]._is_shared;
-      if (is_one_shared_element) cimglist_for(*this,l) list[npos + l].assign(_data[l]);
-      else cimglist_for(*this,l) _data[l].move_to(list[npos + l]);
-      assign();
-      return list;
-    }
-
-    //! Swap all fields between two list instances.
-    /**
-       \param list List to swap fields with.
-       \note Can be used to exchange the content of two lists in a fast way.
-    **/
-    CImgList<T>& swap(CImgList<T>& list) {
-      cimg::swap(_width,list._width,_allocated_width,list._allocated_width);
-      cimg::swap(_data,list._data);
-      return list;
-    }
-
-    //! Return a reference to an empty list.
-    /**
-      \note Can be used to define default values in a function taking a CImgList<T> as an argument.
-      \code
-      void f(const CImgList<char>& list=CImgList<char>::empty());
-      \endcode
-    **/
-    static CImgList<T>& empty() {
-      static CImgList<T> _empty;
-      return _empty.assign();
-    }
-
-    //! Return a reference to an empty list \const.
-    static const CImgList<T>& const_empty() {
-      static const CImgList<T> _empty;
-      return _empty;
-    }
-
-    //@}
-    //------------------------------------------
-    //
-    //! \name Overloaded Operators
-    //@{
-    //------------------------------------------
-
-    //! Return a reference to one image element of the list.
-    /**
-       \param pos Indice of the image element.
-    **/
-    CImg<T>& operator()(const unsigned int pos) {
-#if cimg_verbosity>=3
-      if (pos>=_width) {
-        cimg::warn(_cimglist_instance
-                   "operator(): Invalid image request, at position [%u].",
-                   cimglist_instance,
-                   pos);
-        return *_data;
-      }
-#endif
-      return _data[pos];
-    }
-
-    //! Return a reference to one image of the list.
-    /**
-       \param pos Indice of the image element.
-    **/
-    const CImg<T>& operator()(const unsigned int pos) const {
-      return const_cast<CImgList<T>*>(this)->operator()(pos);
-    }
-
-    //! Return a reference to one pixel value of one image of the list.
-    /**
-       \param pos Indice of the image element.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list(n,x,y,z,c)</tt> is equivalent to <tt>list[n](x,y,z,c)</tt>.
-    **/
-    T& operator()(const unsigned int pos, const unsigned int x, const unsigned int y=0,
-                  const unsigned int z=0, const unsigned int c=0) {
-      return (*this)[pos](x,y,z,c);
-    }
-
-    //! Return a reference to one pixel value of one image of the list \const.
-    const T& operator()(const unsigned int pos, const unsigned int x, const unsigned int y=0,
-                        const unsigned int z=0, const unsigned int c=0) const {
-      return (*this)[pos](x,y,z,c);
-    }
-
-    //! Return pointer to the first image of the list.
-    /**
-       \note Images in a list are stored as a buffer of \c CImg<T>.
-    **/
-    operator CImg<T>*() {
-      return _data;
-    }
-
-    //! Return pointer to the first image of the list \const.
-    operator const CImg<T>*() const {
-      return _data;
-    }
-
-    //! Construct list from one image \inplace.
-    /**
-        \param img Input image to copy in the constructed list.
-        \note <tt>list = img;</tt> is equivalent to <tt>list.assign(img);</tt>.
-    **/
-    template<typename t>
-    CImgList<T>& operator=(const CImg<t>& img) {
-      return assign(img);
-    }
-
-    //! Construct list from another list.
-    /**
-       \param list Input list to copy.
-       \note <tt>list1 = list2</tt> is equivalent to <tt>list1.assign(list2);</tt>.
-    **/
-    template<typename t>
-    CImgList<T>& operator=(const CImgList<t>& list) {
-      return assign(list);
-    }
-
-    //! Construct list from another list \specialization.
-    CImgList<T>& operator=(const CImgList<T>& list) {
-      return assign(list);
-    }
-
-    //! Construct list by reading the content of a file \inplace.
-    /**
-       \see CImgList(const char *const).
-    **/
-    CImgList<T>& operator=(const char *const filename) {
-      return assign(filename);
-    }
-
-    //! Construct list from the content of a display window \inplace.
-    /**
-        \see CImgList(const CImgDisplay&).
-    **/
-    CImgList<T>& operator=(const CImgDisplay& disp) {
-      return assign(disp);
-    }
-
-    //! Return a non-shared copy of a list.
-    /**
-        \note <tt>+list</tt> is equivalent to <tt>CImgList<T>(list,false)</tt>.
-          It forces the copy to have non-shared elements.
-    **/
-    CImgList<T> operator+() const {
-      return CImgList<T>(*this,false);
-    }
-
-    //! Return a copy of the list instance, where image \c img has been inserted at the end.
-    /**
-       \param img Image inserted at the end of the instance copy.
-       \note Define a convenient way to create temporary lists of images, as in the following code:
-       \code
-       (img1,img2,img3,img4).display("My four images");
-       \endcode
-    **/
-    template<typename t>
-    CImgList<T>& operator,(const CImg<t>& img) {
-      return insert(img);
-    }
-
-    //! Return a copy of the list instance, where image \c img has been inserted at the end \const.
-    template<typename t>
-    CImgList<T> operator,(const CImg<t>& img) const {
-      return (+*this).insert(img);
-    }
-
-    //! Return a copy of the list instance, where all elements of input list \c list have been inserted at the end.
-    /**
-       \param list List inserted at the end of the instance copy.
-    **/
-    template<typename t>
-    CImgList<T>& operator,(const CImgList<t>& list) {
-      return insert(list);
-    }
-
-    //! Return a copy of the list instance, where all elements of input \c list have been inserted at the end \const.
-    template<typename t>
-    CImgList<T>& operator,(const CImgList<t>& list) const {
-      return (+*this).insert(list);
-    }
-
-    //! Return image corresponding to the appending of all images of the instance list along specified axis.
-    /**
-      \param axis Appending axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \note <tt>list>'x'</tt> is equivalent to <tt>list.get_append('x')</tt>.
-    **/
-    CImg<T> operator>(const char axis) const {
-      return get_append(axis,0);
-    }
-
-    //! Return list corresponding to the splitting of all images of the instance list along specified axis.
-    /**
-      \param axis Axis used for image splitting.
-      \note <tt>list<'x'</tt> is equivalent to <tt>list.get_split('x')</tt>.
-    **/
-    CImgList<T> operator<(const char axis) const {
-      return get_split(axis);
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Instance Characteristics
-    //@{
-    //-------------------------------------
-
-    //! Return the type of image pixel values as a C string.
-    /**
-       Return a \c char* string containing the usual type name of the image pixel values
-       (i.e. a stringified version of the template parameter \c T).
-       \note
-       - The returned string may contain spaces (as in \c "unsigned char").
-       - If the pixel type \c T does not correspond to a registered type, the string <tt>"unknown"</tt> is returned.
-    **/
-    static const char* pixel_type() {
-      return cimg::type<T>::string();
-    }
-
-    //! Return the size of the list, i.e. the number of images contained in it.
-    /**
-      \note Similar to size() but returns result as a (signed) integer.
-    **/
-    int width() const {
-      return (int)_width;
-    }
-
-    //! Return the size of the list, i.e. the number of images contained in it.
-    /**
-      \note Similar to width() but returns result as an unsigned integer.
-    **/
-    unsigned int size() const {
-      return _width;
-    }
-
-    //! Return pointer to the first image of the list.
-    /**
-       \note Images in a list are stored as a buffer of \c CImg<T>.
-    **/
-    CImg<T> *data() {
-      return _data;
-    }
-
-    //! Return pointer to the first image of the list \const.
-    const CImg<T> *data() const {
-      return _data;
-    }
-
-    //! Return pointer to the pos-th image of the list.
-    /**
-       \param pos Indice of the image element to access.
-       \note <tt>list.data(n);</tt> is equivalent to <tt>list.data + n;</tt>.
-    **/
-#if cimg_verbosity>=3
-    CImg<T> *data(const unsigned int pos) {
-      if (pos>=size())
-        cimg::warn(_cimglist_instance
-                   "data(): Invalid pointer request, at position [%u].",
-                   cimglist_instance,
-                   pos);
-      return _data + pos;
-    }
-
-    const CImg<T> *data(const unsigned int l) const {
-      return const_cast<CImgList<T>*>(this)->data(l);
-    }
-#else
-    CImg<T> *data(const unsigned int l) {
-      return _data + l;
-    }
-
-    //! Return pointer to the pos-th image of the list \const.
-    const CImg<T> *data(const unsigned int l) const {
-      return _data + l;
-    }
-#endif
-
-    //! Return iterator to the first image of the list.
-    /**
-    **/
-    iterator begin() {
-      return _data;
-    }
-
-    //! Return iterator to the first image of the list \const.
-    const_iterator begin() const {
-      return _data;
-    }
-
-    //! Return iterator to one position after the last image of the list.
-    /**
-    **/
-    iterator end() {
-      return _data + _width;
-    }
-
-    //! Return iterator to one position after the last image of the list \const.
-    const_iterator end() const {
-      return _data + _width;
-    }
-
-    //! Return reference to the first image of the list.
-    /**
-    **/
-    CImg<T>& front() {
-      return *_data;
-    }
-
-    //! Return reference to the first image of the list \const.
-    const CImg<T>& front() const {
-      return *_data;
-    }
-
-    //! Return a reference to the last image of the list.
-    /**
-    **/
-    const CImg<T>& back() const {
-      return *(_data + _width - 1);
-    }
-
-    //! Return a reference to the last image of the list \const.
-    CImg<T>& back() {
-      return *(_data + _width - 1);
-    }
-
-    //! Return pos-th image of the list.
-    /**
-       \param pos Indice of the image element to access.
-    **/
-    CImg<T>& at(const int pos) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "at(): Empty instance.",
-                                    cimglist_instance);
-
-      return _data[cimg::cut(pos,0,width() - 1)];
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions.
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note <tt>list.atNXYZC(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZC(x,y,z,c);</tt>.
-    **/
-    T& atNXYZC(const int pos, const int x, const int y, const int z, const int c, const T& out_value) {
-      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_value)=out_value):_data[pos].atXYZC(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions \const.
-    T atNXYZC(const int pos, const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (pos<0 || pos>=(int)_width)?out_value:_data[pos].atXYZC(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions.
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list.atNXYZC(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZC(x,y,z,c);</tt>.
-    **/
-    T& atNXYZC(const int pos, const int x, const int y, const int z, const int c) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXYZC(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXYZC(pos,x,y,z,c);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions \const.
-    T atNXYZC(const int pos, const int x, const int y, const int z, const int c) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXYZC(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXYZC(pos,x,y,z,c);
-    }
-
-    T& _atNXYZC(const int pos, const int x, const int y, const int z, const int c) {
-      return _data[cimg::cut(pos,0,width() - 1)].atXYZC(x,y,z,c);
-    }
-
-    T _atNXYZC(const int pos, const int x, const int y, const int z, const int c) const {
-      return _data[cimg::cut(pos,0,width() - 1)].atXYZC(x,y,z,c);
-    }
-
-    //! Access pixel value with Dirichlet boundary conditions for the 3 coordinates (\c pos, \c x,\c y,\c z).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atNXYZ(const int pos, const int x, const int y, const int z, const int c, const T& out_value) {
-      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_value)=out_value):_data[pos].atXYZ(x,y,z,c,out_value);
-    }
-
-    //! Access pixel value with Dirichlet boundary conditions for the 3 coordinates (\c pos, \c x,\c y,\c z) \const.
-    T atNXYZ(const int pos, const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (pos<0 || pos>=(int)_width)?out_value:_data[pos].atXYZ(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 4 coordinates (\c pos, \c x,\c y,\c z).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-   T& atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXYZ(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXYZ(pos,x,y,z,c);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 4 coordinates (\c pos, \c x,\c y,\c z) \const.
-    T atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXYZ(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXYZ(pos,x,y,z,c);
-    }
-
-    T& _atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) {
-      return _data[cimg::cut(pos,0,width() - 1)].atXYZ(x,y,z,c);
-    }
-
-    T _atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) const {
-      return _data[cimg::cut(pos,0,width() - 1)].atXYZ(x,y,z,c);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the 3 coordinates (\c pos, \c x,\c y).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atNXY(const int pos, const int x, const int y, const int z, const int c, const T& out_value) {
-      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_value)=out_value):_data[pos].atXY(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the 3 coordinates (\c pos, \c x,\c y) \const.
-    T atNXY(const int pos, const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (pos<0 || pos>=(int)_width)?out_value:_data[pos].atXY(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 3 coordinates (\c pos, \c x,\c y).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXY(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXY(pos,x,y,z,c);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 3 coordinates (\c pos, \c x,\c y) \const.
-    T atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNXY(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNXY(pos,x,y,z,c);
-    }
-
-    T& _atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) {
-      return _data[cimg::cut(pos,0,width() - 1)].atXY(x,y,z,c);
-    }
-
-    T _atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) const {
-      return _data[cimg::cut(pos,0,width() - 1)].atXY(x,y,z,c);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the 2 coordinates (\c pos,\c x).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atNX(const int pos, const int x, const int y, const int z, const int c, const T& out_value) {
-      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_value)=out_value):_data[pos].atX(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the 2 coordinates (\c pos,\c x) \const.
-    T atNX(const int pos, const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (pos<0 || pos>=(int)_width)?out_value:_data[pos].atX(x,y,z,c,out_value);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 2 coordinates (\c pos, \c x).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNX(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNX(pos,x,y,z,c);
-    }
-
-    //! Access to pixel value with Neumann boundary conditions for the 2 coordinates (\c pos, \c x) \const.
-    T atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atNX(): Empty instance.",
-                                    cimglist_instance);
-
-      return _atNX(pos,x,y,z,c);
-    }
-
-    T& _atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) {
-      return _data[cimg::cut(pos,0,width() - 1)].atX(x,y,z,c);
-    }
-
-    T _atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) const {
-      return _data[cimg::cut(pos,0,width() - 1)].atX(x,y,z,c);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the coordinate (\c pos).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \param out_value Default value returned if \c offset is outside image bounds.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atN(const int pos, const int x, const int y, const int z, const int c, const T& out_value) {
-      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_value)=out_value):(*this)(pos,x,y,z,c);
-    }
-
-    //! Access to pixel value with Dirichlet boundary conditions for the coordinate (\c pos) \const.
-    T atN(const int pos, const int x, const int y, const int z, const int c, const T& out_value) const {
-      return (pos<0 || pos>=(int)_width)?out_value:(*this)(pos,x,y,z,c);
-    }
-
-    //! Return pixel value with Neumann boundary conditions for the coordinate (\c pos).
-    /**
-       \param pos Indice of the image element to access.
-       \param x X-coordinate of the pixel value.
-       \param y Y-coordinate of the pixel value.
-       \param z Z-coordinate of the pixel value.
-       \param c C-coordinate of the pixel value.
-       \note <tt>list.atNXYZ(p,x,y,z,c);</tt> is equivalent to <tt>list[p].atXYZ(x,y,z,c);</tt>.
-    **/
-    T& atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atN(): Empty instance.",
-                                    cimglist_instance);
-      return _atN(pos,x,y,z,c);
-    }
-
-    //! Return pixel value with Neumann boundary conditions for the coordinate (\c pos) \const.
-    T atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "atN(): Empty instance.",
-                                    cimglist_instance);
-      return _atN(pos,x,y,z,c);
-    }
-
-    T& _atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) {
-      return _data[cimg::cut(pos,0,width() - 1)](x,y,z,c);
-    }
-
-    T _atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) const {
-      return _data[cimg::cut(pos,0,width() - 1)](x,y,z,c);
-    }
-
-    //! Return a C-string containing the values of all images in the instance list.
-    /**
-       \param separator Character separator set between consecutive pixel values.
-       \param max_size Maximum size of the returned string.
-       \note The result is returne as a <tt>CImg<char></tt> image whose pixel buffer contains the desired C-string.
-    **/
-    CImg<charT> value_string(const char separator=',', const unsigned int max_size=0) const {
-      if (is_empty()) return CImg<ucharT>(1,1,1,1,0);
-      CImgList<charT> items;
-      for (unsigned int l = 0; l<_width - 1; ++l) {
-        CImg<charT> item = _data[l].value_string(separator,0);
-        item.back() = separator;
-        item.move_to(items);
-      }
-      _data[_width - 1].value_string(separator,0).move_to(items);
-      CImg<charT> res; (items>'x').move_to(res);
-      if (max_size) { res.crop(0,max_size); res(max_size) = 0; }
-      return res;
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Instance Checking
-    //@{
-    //-------------------------------------
-
-    //! Return \c true if list is empty.
-    /**
-    **/
-    bool is_empty() const {
-      return (!_data || !_width);
-    }
-
-    //! Test if number of image elements is equal to specified value.
-    /**
-        \param size_n Number of image elements to test.
-    **/
-    bool is_sameN(const unsigned int size_n) const {
-      return _width==size_n;
-    }
-
-    //! Test if number of image elements is equal between two images lists.
-    /**
-        \param list Input list to compare with.
-    **/
-    template<typename t>
-    bool is_sameN(const CImgList<t>& list) const {
-      return is_sameN(list._width);
-    }
-
-    // Define useful functions to check list dimensions.
-    // (cannot be documented because macro-generated).
-#define _cimglist_def_is_same1(axis) \
-    bool is_same##axis(const unsigned int val) const { \
-      bool res = true; \
-      for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis(val); return res; \
-    } \
-    bool is_sameN##axis(const unsigned int n, const unsigned int val) const { \
-      return is_sameN(n) && is_same##axis(val); \
-    } \
-
-#define _cimglist_def_is_same2(axis1,axis2) \
-    bool is_same##axis1##axis2(const unsigned int val1, const unsigned int val2) const { \
-      bool res = true; \
-      for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis1##axis2(val1,val2); return res; \
-    } \
-    bool is_sameN##axis1##axis2(const unsigned int n, const unsigned int val1, const unsigned int val2) const { \
-      return is_sameN(n) && is_same##axis1##axis2(val1,val2); \
-    } \
-
-#define _cimglist_def_is_same3(axis1,axis2,axis3) \
-    bool is_same##axis1##axis2##axis3(const unsigned int val1, const unsigned int val2, \
-                                      const unsigned int val3) const { \
-      bool res = true; \
-      for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis1##axis2##axis3(val1,val2,val3); \
-      return res; \
-    } \
-    bool is_sameN##axis1##axis2##axis3(const unsigned int n, const unsigned int val1, \
-                                       const unsigned int val2, const unsigned int val3) const { \
-      return is_sameN(n) && is_same##axis1##axis2##axis3(val1,val2,val3); \
-    } \
-
-#define _cimglist_def_is_same(axis) \
-    template<typename t> bool is_same##axis(const CImg<t>& img) const { \
-      bool res = true; for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis(img); return res; \
-    } \
-    template<typename t> bool is_same##axis(const CImgList<t>& list) const { \
-      const unsigned int lmin = std::min(_width,list._width); \
-      bool res = true; for (unsigned int l = 0; l<lmin && res; ++l) res = _data[l].is_same##axis(list[l]); return res; \
-    } \
-    template<typename t> bool is_sameN##axis(const unsigned int n, const CImg<t>& img) const { \
-      return (is_sameN(n) && is_same##axis(img)); \
-    } \
-    template<typename t> bool is_sameN##axis(const CImgList<t>& list) const { \
-      return (is_sameN(list) && is_same##axis(list)); \
-    }
-
-    _cimglist_def_is_same(XY)
-    _cimglist_def_is_same(XZ)
-    _cimglist_def_is_same(XC)
-    _cimglist_def_is_same(YZ)
-    _cimglist_def_is_same(YC)
-    _cimglist_def_is_same(XYZ)
-    _cimglist_def_is_same(XYC)
-    _cimglist_def_is_same(YZC)
-    _cimglist_def_is_same(XYZC)
-    _cimglist_def_is_same1(X)
-    _cimglist_def_is_same1(Y)
-    _cimglist_def_is_same1(Z)
-    _cimglist_def_is_same1(C)
-    _cimglist_def_is_same2(X,Y)
-    _cimglist_def_is_same2(X,Z)
-    _cimglist_def_is_same2(X,C)
-    _cimglist_def_is_same2(Y,Z)
-    _cimglist_def_is_same2(Y,C)
-    _cimglist_def_is_same2(Z,C)
-    _cimglist_def_is_same3(X,Y,Z)
-    _cimglist_def_is_same3(X,Y,C)
-    _cimglist_def_is_same3(X,Z,C)
-    _cimglist_def_is_same3(Y,Z,C)
-
-    //! Test if dimensions of each image of the list match specified arguments.
-    /**
-      \param dx Checked image width.
-      \param dy Checked image height.
-      \param dz Checked image depth.
-      \param dc Checked image spectrum.
-    **/
-    bool is_sameXYZC(const unsigned int dx, const unsigned int dy,
-                     const unsigned int dz, const unsigned int dc) const {
-      bool res = true;
-      for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_sameXYZC(dx,dy,dz,dc);
-      return res;
-    }
-
-    //! Test if list dimensions match specified arguments.
-    /**
-       \param n Number of images in the list.
-       \param dx Checked image width.
-       \param dy Checked image height.
-       \param dz Checked image depth.
-       \param dc Checked image spectrum.
-    **/
-    bool is_sameNXYZC(const unsigned int n,
-                      const unsigned int dx, const unsigned int dy,
-                      const unsigned int dz, const unsigned int dc) const {
-      return is_sameN(n) && is_sameXYZC(dx,dy,dz,dc);
-    }
-
-    //! Test if list contains one particular pixel location.
-    /**
-       \param n Index of the image whom checked pixel value belong to.
-       \param x X-coordinate of the checked pixel value.
-       \param y Y-coordinate of the checked pixel value.
-       \param z Z-coordinate of the checked pixel value.
-       \param c C-coordinate of the checked pixel value.
-    **/
-    bool containsNXYZC(const int n, const int x=0, const int y=0, const int z=0, const int c=0) const {
-      if (is_empty()) return false;
-      return n>=0 && n<(int)_width && x>=0 && x<_data[n].width() && y>=0 && y<_data[n].height() &&
-        z>=0 && z<_data[n].depth() && c>=0 && c<_data[n].spectrum();
-    }
-
-    //! Test if list contains image with specified indice.
-    /**
-       \param n Index of the checked image.
-    **/
-    bool containsN(const int n) const {
-      if (is_empty()) return false;
-      return n>=0 && n<(int)_width;
-    }
-
-    //! Test if one image of the list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-       \param[out] n Index of image containing the pixel value, if test succeeds.
-       \param[out] x X-coordinate of the pixel value, if test succeeds.
-       \param[out] y Y-coordinate of the pixel value, if test succeeds.
-       \param[out] z Z-coordinate of the pixel value, if test succeeds.
-       \param[out] c C-coordinate of the pixel value, if test succeeds.
-       \note If true, set coordinates (n,x,y,z,c).
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& n, t& x, t&y, t& z, t& c) const {
-      if (is_empty()) return false;
-      cimglist_for(*this,l) if (_data[l].contains(pixel,x,y,z,c)) { n = (t)l; return true; }
-      return false;
-    }
-
-    //! Test if one of the image list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-       \param[out] n Index of image containing the pixel value, if test succeeds.
-       \param[out] x X-coordinate of the pixel value, if test succeeds.
-       \param[out] y Y-coordinate of the pixel value, if test succeeds.
-       \param[out] z Z-coordinate of the pixel value, if test succeeds.
-       \note If true, set coordinates (n,x,y,z).
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& n, t& x, t&y, t& z) const {
-      t c;
-      return contains(pixel,n,x,y,z,c);
-    }
-
-    //! Test if one of the image list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-       \param[out] n Index of image containing the pixel value, if test succeeds.
-       \param[out] x X-coordinate of the pixel value, if test succeeds.
-       \param[out] y Y-coordinate of the pixel value, if test succeeds.
-       \note If true, set coordinates (n,x,y).
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& n, t& x, t&y) const {
-      t z, c;
-      return contains(pixel,n,x,y,z,c);
-    }
-
-    //! Test if one of the image list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-       \param[out] n Index of image containing the pixel value, if test succeeds.
-       \param[out] x X-coordinate of the pixel value, if test succeeds.
-       \note If true, set coordinates (n,x).
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& n, t& x) const {
-      t y, z, c;
-      return contains(pixel,n,x,y,z,c);
-    }
-
-    //! Test if one of the image list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-       \param[out] n Index of image containing the pixel value, if test succeeds.
-       \note If true, set coordinates (n).
-    **/
-    template<typename t>
-    bool contains(const T& pixel, t& n) const {
-      t x, y, z, c;
-      return contains(pixel,n,x,y,z,c);
-    }
-
-    //! Test if one of the image list contains the specified referenced value.
-    /**
-       \param pixel Reference to pixel value to test.
-    **/
-    bool contains(const T& pixel) const {
-      unsigned int n, x, y, z, c;
-      return contains(pixel,n,x,y,z,c);
-    }
-
-    //! Test if the list contains the image 'img'.
-    /**
-       \param img Reference to image to test.
-       \param[out] n Index of image in the list, if test succeeds.
-       \note If true, returns the position (n) of the image in the list.
-    **/
-    template<typename t>
-    bool contains(const CImg<T>& img, t& n) const {
-      if (is_empty()) return false;
-      const CImg<T> *const ptr = &img;
-      cimglist_for(*this,i) if (_data + i==ptr) { n = (t)i; return true; }
-      return false;
-    }
-
-    //! Test if the list contains the image img.
-    /**
-       \param img Reference to image to test.
-    **/
-    bool contains(const CImg<T>& img) const {
-      unsigned int n;
-      return contains(img,n);
-    }
-
-    //@}
-    //-------------------------------------
-    //
-    //! \name Mathematical Functions
-    //@{
-    //-------------------------------------
-
-    //! Return a reference to the minimum pixel value of the instance list.
-    /**
-    **/
-    T& min() {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "min(): Empty instance.",
-                                    cimglist_instance);
-      T *ptr_min = _data->_data;
-      T min_value = *ptr_min;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
-      }
-      return *ptr_min;
-    }
-
-    //! Return a reference to the minimum pixel value of the instance list \const.
-    const T& min() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "min(): Empty instance.",
-                                    cimglist_instance);
-      const T *ptr_min = _data->_data;
-      T min_value = *ptr_min;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
-      }
-      return *ptr_min;
-    }
-
-    //! Return a reference to the maximum pixel value of the instance list.
-    /**
-    **/
-    T& max() {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "max(): Empty instance.",
-                                    cimglist_instance);
-      T *ptr_max = _data->_data;
-      T max_value = *ptr_max;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
-      }
-      return *ptr_max;
-    }
-
-    //! Return a reference to the maximum pixel value of the instance list \const.
-    const T& max() const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "max(): Empty instance.",
-                                    cimglist_instance);
-      const T *ptr_max = _data->_data;
-      T max_value = *ptr_max;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
-      }
-      return *ptr_max;
-    }
-
-    //! Return a reference to the minimum pixel value of the instance list and return the maximum vvalue as well.
-    /**
-       \param[out] max_val Value of the maximum value found.
-    **/
-    template<typename t>
-    T& min_max(t& max_val) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "min_max(): Empty instance.",
-                                    cimglist_instance);
-      T *ptr_min = _data->_data;
-      T min_value = *ptr_min, max_value = min_value;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) {
-          const T val = *ptrs;
-          if (val<min_value) { min_value = val; ptr_min = ptrs; }
-          if (val>max_value) max_value = val;
-        }
-      }
-      max_val = (t)max_value;
-      return *ptr_min;
-    }
-
-    //! Return a reference to the minimum pixel value of the instance list and return the maximum vvalue as well \const.
-    /**
-       \param[out] max_val Value of the maximum value found.
-    **/
-    template<typename t>
-    const T& min_max(t& max_val) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "min_max(): Empty instance.",
-                                    cimglist_instance);
-      const T *ptr_min = _data->_data;
-      T min_value = *ptr_min, max_value = min_value;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) {
-          const T val = *ptrs;
-          if (val<min_value) { min_value = val; ptr_min = ptrs; }
-          if (val>max_value) max_value = val;
-        }
-      }
-      max_val = (t)max_value;
-      return *ptr_min;
-    }
-
-    //! Return a reference to the minimum pixel value of the instance list and return the minimum value as well.
-    /**
-       \param[out] min_val Value of the minimum value found.
-    **/
-    template<typename t>
-    T& max_min(t& min_val) {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "max_min(): Empty instance.",
-                                    cimglist_instance);
-      T *ptr_max = _data->_data;
-      T min_value = *ptr_max, max_value = min_value;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) {
-          const T val = *ptrs;
-          if (val>max_value) { max_value = val; ptr_max = ptrs; }
-          if (val<min_value) min_value = val;
-        }
-      }
-      min_val = (t)min_value;
-      return *ptr_max;
-    }
-
-    //! Return a reference to the minimum pixel value of the instance list and return the minimum value as well \const.
-    template<typename t>
-    const T& max_min(t& min_val) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "max_min(): Empty instance.",
-                                    cimglist_instance);
-      const T *ptr_max = _data->_data;
-      T min_value = *ptr_max, max_value = min_value;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_for(img,ptrs,T) {
-          const T val = *ptrs;
-          if (val>max_value) { max_value = val; ptr_max = ptrs; }
-          if (val<min_value) min_value = val;
-        }
-      }
-      min_val = (t)min_value;
-      return *ptr_max;
-    }
-
-    //@}
-    //---------------------------
-    //
-    //! \name List Manipulation
-    //@{
-    //---------------------------
-
-    //! Insert a copy of the image \c img into the current image list, at position \c pos.
-    /**
-        \param img Image to insert a copy to the list.
-        \param pos Index of the insertion.
-        \param is_shared Tells if the inserted image is a shared copy of \c img or not.
-    **/
-    template<typename t>
-    CImgList<T>& insert(const CImg<t>& img, const unsigned int pos=~0U, const bool is_shared=false) {
-      const unsigned int npos = pos==~0U?_width:pos;
-      if (npos>_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "insert(): Invalid insertion request of specified image (%u,%u,%u,%u,%p) "
-                                    "at position %u.",
-                                    cimglist_instance,
-                                    img._width,img._height,img._depth,img._spectrum,img._data,npos);
-      if (is_shared)
-        throw CImgArgumentException(_cimglist_instance
-                                    "insert(): Invalid insertion request of specified shared image "
-                                    "CImg<%s>(%u,%u,%u,%u,%p) at position %u (pixel types are different).",
-                                    cimglist_instance,
-                                    img.pixel_type(),img._width,img._height,img._depth,img._spectrum,img._data,npos);
-
-      CImg<T> *const new_data = (++_width>_allocated_width)?new CImg<T>[_allocated_width?(_allocated_width<<=1):
-                                                                        (_allocated_width=16)]:0;
-      if (!_data) { // Insert new element into empty list.
-        _data = new_data;
-        *_data = img;
-      } else {
-        if (new_data) { // Insert with re-allocation.
-          if (npos) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos);
-          if (npos!=_width - 1) std::memcpy(new_data + npos + 1,_data + npos,sizeof(CImg<T>)*(_width - 1 - npos));
-          std::memset(_data,0,sizeof(CImg<T>)*(_width - 1));
-          delete[] _data;
-          _data = new_data;
-        } else if (npos!=_width - 1) // Insert without re-allocation.
-          std::memmove(_data + npos + 1,_data + npos,sizeof(CImg<T>)*(_width - 1 - npos));
-        _data[npos]._width = _data[npos]._height = _data[npos]._depth = _data[npos]._spectrum = 0;
-        _data[npos]._data = 0;
-        _data[npos] = img;
-      }
-      return *this;
-    }
-
-    //! Insert a copy of the image \c img into the current image list, at position \c pos \specialization.
-    CImgList<T>& insert(const CImg<T>& img, const unsigned int pos=~0U, const bool is_shared=false) {
-      const unsigned int npos = pos==~0U?_width:pos;
-      if (npos>_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "insert(): Invalid insertion request of specified image (%u,%u,%u,%u,%p) "
-                                    "at position %u.",
-                                    cimglist_instance,
-                                    img._width,img._height,img._depth,img._spectrum,img._data,npos);
-      CImg<T> *const new_data = (++_width>_allocated_width)?new CImg<T>[_allocated_width?(_allocated_width<<=1):
-                                                                        (_allocated_width=16)]:0;
-      if (!_data) { // Insert new element into empty list.
-        _data = new_data;
-        if (is_shared && img) {
-          _data->_width = img._width;
-          _data->_height = img._height;
-          _data->_depth = img._depth;
-          _data->_spectrum = img._spectrum;
-          _data->_is_shared = true;
-          _data->_data = img._data;
-        } else *_data = img;
-      }
-      else {
-        if (new_data) { // Insert with re-allocation.
-          if (npos) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos);
-          if (npos!=_width - 1) std::memcpy(new_data + npos + 1,_data + npos,sizeof(CImg<T>)*(_width - 1 - npos));
-          if (is_shared && img) {
-            new_data[npos]._width = img._width;
-            new_data[npos]._height = img._height;
-            new_data[npos]._depth = img._depth;
-            new_data[npos]._spectrum = img._spectrum;
-            new_data[npos]._is_shared = true;
-            new_data[npos]._data = img._data;
-          } else {
-            new_data[npos]._width = new_data[npos]._height = new_data[npos]._depth = new_data[npos]._spectrum = 0;
-            new_data[npos]._data = 0;
-            new_data[npos] = img;
-          }
-          std::memset(_data,0,sizeof(CImg<T>)*(_width - 1));
-          delete[] _data;
-          _data = new_data;
-        } else { // Insert without re-allocation.
-          if (npos!=_width - 1) std::memmove(_data + npos + 1,_data + npos,sizeof(CImg<T>)*(_width - 1 - npos));
-          if (is_shared && img) {
-            _data[npos]._width = img._width;
-            _data[npos]._height = img._height;
-            _data[npos]._depth = img._depth;
-            _data[npos]._spectrum = img._spectrum;
-            _data[npos]._is_shared = true;
-            _data[npos]._data = img._data;
-          } else {
-            _data[npos]._width = _data[npos]._height = _data[npos]._depth = _data[npos]._spectrum = 0;
-            _data[npos]._data = 0;
-            _data[npos] = img;
-          }
-        }
-      }
-      return *this;
-    }
-
-    //! Insert a copy of the image \c img into the current image list, at position \c pos \newinstance.
-    template<typename t>
-    CImgList<T> get_insert(const CImg<t>& img, const unsigned int pos=~0U, const bool is_shared=false) const {
-      return (+*this).insert(img,pos,is_shared);
-    }
-
-    //! Insert n empty images img into the current image list, at position \p pos.
-    /**
-       \param n Number of empty images to insert.
-       \param pos Index of the insertion.
-    **/
-    CImgList<T>& insert(const unsigned int n, const unsigned int pos=~0U) {
-      CImg<T> empty;
-      if (!n) return *this;
-      const unsigned int npos = pos==~0U?_width:pos;
-      for (unsigned int i = 0; i<n; ++i) insert(empty,npos+i);
-      return *this;
-    }
-
-    //! Insert n empty images img into the current image list, at position \p pos \newinstance.
-    CImgList<T> get_insert(const unsigned int n, const unsigned int pos=~0U) const {
-      return (+*this).insert(n,pos);
-    }
-
-    //! Insert \c n copies of the image \c img into the current image list, at position \c pos.
-    /**
-       \param n Number of image copies to insert.
-       \param img Image to insert by copy.
-       \param pos Index of the insertion.
-       \param is_shared Tells if inserted images are shared copies of \c img or not.
-    **/
-    template<typename t>
-    CImgList<T>& insert(const unsigned int n, const CImg<t>& img, const unsigned int pos=~0U,
-                        const bool is_shared=false) {
-      if (!n) return *this;
-      const unsigned int npos = pos==~0U?_width:pos;
-      insert(img,npos,is_shared);
-      for (unsigned int i = 1; i<n; ++i) insert(_data[npos],npos + i,is_shared);
-      return *this;
-    }
-
-    //! Insert \c n copies of the image \c img into the current image list, at position \c pos \newinstance.
-    template<typename t>
-    CImgList<T> get_insert(const unsigned int n, const CImg<t>& img, const unsigned int pos=~0U,
-                           const bool is_shared=false) const {
-      return (+*this).insert(n,img,pos,is_shared);
-    }
-
-    //! Insert a copy of the image list \c list into the current image list, starting from position \c pos.
-    /**
-      \param list Image list to insert.
-      \param pos Index of the insertion.
-      \param is_shared Tells if inserted images are shared copies of images of \c list or not.
-    **/
-    template<typename t>
-    CImgList<T>& insert(const CImgList<t>& list, const unsigned int pos=~0U, const bool is_shared=false) {
-      const unsigned int npos = pos==~0U?_width:pos;
-      if ((void*)this!=(void*)&list) cimglist_for(list,l) insert(list[l],npos + l,is_shared);
-      else insert(CImgList<T>(list),npos,is_shared);
-      return *this;
-    }
-
-    //! Insert a copy of the image list \c list into the current image list, starting from position \c pos \newinstance.
-    template<typename t>
-    CImgList<T> get_insert(const CImgList<t>& list, const unsigned int pos=~0U, const bool is_shared=false) const {
-      return (+*this).insert(list,pos,is_shared);
-    }
-
-    //! Insert n copies of the list \c list at position \c pos of the current list.
-    /**
-      \param n Number of list copies to insert.
-      \param list Image list to insert.
-      \param pos Index of the insertion.
-      \param is_shared Tells if inserted images are shared copies of images of \c list or not.
-    **/
-    template<typename t>
-    CImgList<T>& insert(const unsigned int n, const CImgList<t>& list, const unsigned int pos=~0U,
-                        const bool is_shared=false) {
-      if (!n) return *this;
-      const unsigned int npos = pos==~0U?_width:pos;
-      for (unsigned int i = 0; i<n; ++i) insert(list,npos,is_shared);
-      return *this;
-    }
-
-    //! Insert n copies of the list \c list at position \c pos of the current list \newinstance.
-    template<typename t>
-    CImgList<T> get_insert(const unsigned int n, const CImgList<t>& list, const unsigned int pos=~0U,
-                           const bool is_shared=false) const {
-      return (+*this).insert(n,list,pos,is_shared);
-    }
-
-    //! Remove all images between from indexes.
-    /**
-      \param pos1 Starting index of the removal.
-      \param pos2 Ending index of the removal.
-    **/
-    CImgList<T>& remove(const unsigned int pos1, const unsigned int pos2) {
-      const unsigned int
-        npos1 = pos1<pos2?pos1:pos2,
-        tpos2 = pos1<pos2?pos2:pos1,
-        npos2 = tpos2<_width?tpos2:_width - 1;
-      if (npos1>=_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "remove(): Invalid remove request at positions %u->%u.",
-                                    cimglist_instance,
-                                    npos1,tpos2);
-      else {
-        if (tpos2>=_width)
-          throw CImgArgumentException(_cimglist_instance
-                                      "remove(): Invalid remove request at positions %u->%u.",
-                                      cimglist_instance,
-                                      npos1,tpos2);
-
-        for (unsigned int k = npos1; k<=npos2; ++k) _data[k].assign();
-        const unsigned int nb = 1 + npos2 - npos1;
-        if (!(_width-=nb)) return assign();
-        if (_width>(_allocated_width>>2) || _allocated_width<=16) { // Removing items without reallocation.
-          if (npos1!=_width) std::memmove(_data + npos1,_data + npos2 + 1,sizeof(CImg<T>)*(_width - npos1));
-          std::memset(_data + _width,0,sizeof(CImg<T>)*nb);
-        } else { // Removing items with reallocation.
-          _allocated_width>>=2;
-          while (_allocated_width>16 && _width<(_allocated_width>>1)) _allocated_width>>=1;
-          CImg<T> *const new_data = new CImg<T>[_allocated_width];
-          if (npos1) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos1);
-          if (npos1!=_width) std::memcpy(new_data + npos1,_data + npos2 + 1,sizeof(CImg<T>)*(_width - npos1));
-          if (_width!=_allocated_width) std::memset(new_data + _width,0,sizeof(CImg<T>)*(_allocated_width - _width));
-          std::memset(_data,0,sizeof(CImg<T>)*(_width + nb));
-          delete[] _data;
-          _data = new_data;
-        }
-      }
-      return *this;
-    }
-
-    //! Remove all images between from indexes \newinstance.
-    CImgList<T> get_remove(const unsigned int pos1, const unsigned int pos2) const {
-      return (+*this).remove(pos1,pos2);
-    }
-
-    //! Remove image at index \c pos from the image list.
-    /**
-      \param pos Index of the image to remove.
-    **/
-    CImgList<T>& remove(const unsigned int pos) {
-      return remove(pos,pos);
-    }
-
-    //! Remove image at index \c pos from the image list \newinstance.
-    CImgList<T> get_remove(const unsigned int pos) const {
-      return (+*this).remove(pos);
-    }
-
-    //! Remove last image.
-    /**
-    **/
-    CImgList<T>& remove() {
-      return remove(_width - 1);
-    }
-
-    //! Remove last image \newinstance.
-    CImgList<T> get_remove() const {
-      return (+*this).remove();
-    }
-
-    //! Reverse list order.
-    CImgList<T>& reverse() {
-      for (unsigned int l = 0; l<_width/2; ++l) (*this)[l].swap((*this)[_width - 1 - l]);
-      return *this;
-    }
-
-    //! Reverse list order \newinstance.
-    CImgList<T> get_reverse() const {
-      return (+*this).reverse();
-    }
-
-    //! Return a sublist.
-    /**
-      \param pos0 Starting index of the sublist.
-      \param pos1 Ending index of the sublist.
-    **/
-    CImgList<T>& images(const unsigned int pos0, const unsigned int pos1) {
-      return get_images(pos0,pos1).move_to(*this);
-    }
-
-    //! Return a sublist \newinstance.
-    CImgList<T> get_images(const unsigned int pos0, const unsigned int pos1) const {
-      if (pos0>pos1 || pos1>=_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "images(): Specified sub-list indices (%u->%u) are out of bounds.",
-                                    cimglist_instance,
-                                    pos0,pos1);
-      CImgList<T> res(pos1 - pos0 + 1);
-      cimglist_for(res,l) res[l].assign(_data[pos0 + l]);
-      return res;
-    }
-
-    //! Return a shared sublist.
-    /**
-      \param pos0 Starting index of the sublist.
-      \param pos1 Ending index of the sublist.
-    **/
-    CImgList<T> get_shared_images(const unsigned int pos0, const unsigned int pos1) {
-      if (pos0>pos1 || pos1>=_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "get_shared_images(): Specified sub-list indices (%u->%u) are out of bounds.",
-                                    cimglist_instance,
-                                    pos0,pos1);
-      CImgList<T> res(pos1 - pos0 + 1);
-      cimglist_for(res,l) res[l].assign(_data[pos0 + l],_data[pos0 + l]?true:false);
-      return res;
-    }
-
-    //! Return a shared sublist \newinstance.
-    const CImgList<T> get_shared_images(const unsigned int pos0, const unsigned int pos1) const {
-      if (pos0>pos1 || pos1>=_width)
-        throw CImgArgumentException(_cimglist_instance
-                                    "get_shared_images(): Specified sub-list indices (%u->%u) are out of bounds.",
-                                    cimglist_instance,
-                                    pos0,pos1);
-      CImgList<T> res(pos1 - pos0 + 1);
-      cimglist_for(res,l) res[l].assign(_data[pos0 + l],_data[pos0 + l]?true:false);
-      return res;
-    }
-
-    //! Return a single image which is the appending of all images of the current CImgList instance.
-    /**
-       \param axis Appending axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param align Appending alignment.
-    **/
-    CImg<T> get_append(const char axis, const float align=0) const {
-      if (is_empty()) return CImg<T>();
-      if (_width==1) return +((*this)[0]);
-      unsigned int dx = 0, dy = 0, dz = 0, dc = 0, pos = 0;
-      CImg<T> res;
-      switch (cimg::lowercase(axis)) {
-      case 'x' : { // Along the X-axis.
-        cimglist_for(*this,l) {
-          const CImg<T>& img = (*this)[l];
-          if (img) {
-            dx+=img._width;
-            dy = std::max(dy,img._height);
-            dz = std::max(dz,img._depth);
-            dc = std::max(dc,img._spectrum);
-          }
-        }
-        res.assign(dx,dy,dz,dc,(T)0);
-        if (res) cimglist_for(*this,l) {
-            const CImg<T>& img = (*this)[l];
-            if (img) res.draw_image(pos,
-                                    (int)(align*(dy - img._height)),
-                                    (int)(align*(dz - img._depth)),
-                                    (int)(align*(dc - img._spectrum)),
-                                    img);
-            pos+=img._width;
-          }
-      } break;
-      case 'y' : { // Along the Y-axis.
-        cimglist_for(*this,l) {
-          const CImg<T>& img = (*this)[l];
-          if (img) {
-            dx = std::max(dx,img._width);
-            dy+=img._height;
-            dz = std::max(dz,img._depth);
-            dc = std::max(dc,img._spectrum);
-          }
-        }
-        res.assign(dx,dy,dz,dc,(T)0);
-        if (res) cimglist_for(*this,l) {
-            const CImg<T>& img = (*this)[l];
-            if (img) res.draw_image((int)(align*(dx - img._width)),
-                                    pos,
-                                    (int)(align*(dz - img._depth)),
-                                    (int)(align*(dc - img._spectrum)),
-                                    img);
-            pos+=img._height;
-          }
-      } break;
-      case 'z' : { // Along the Z-axis.
-        cimglist_for(*this,l) {
-          const CImg<T>& img = (*this)[l];
-          if (img) {
-            dx = std::max(dx,img._width);
-            dy = std::max(dy,img._height);
-            dz+=img._depth;
-            dc = std::max(dc,img._spectrum);
-          }
-        }
-        res.assign(dx,dy,dz,dc,(T)0);
-        if (res) cimglist_for(*this,l) {
-            const CImg<T>& img = (*this)[l];
-            if (img) res.draw_image((int)(align*(dx - img._width)),
-                                    (int)(align*(dy - img._height)),
-                                    pos,
-                                    (int)(align*(dc - img._spectrum)),
-                                    img);
-            pos+=img._depth;
-          }
-      } break;
-      default : { // Along the C-axis.
-        cimglist_for(*this,l) {
-          const CImg<T>& img = (*this)[l];
-          if (img) {
-            dx = std::max(dx,img._width);
-            dy = std::max(dy,img._height);
-            dz = std::max(dz,img._depth);
-            dc+=img._spectrum;
-          }
-        }
-        res.assign(dx,dy,dz,dc,(T)0);
-        if (res) cimglist_for(*this,l) {
-            const CImg<T>& img = (*this)[l];
-            if (img) res.draw_image((int)(align*(dx - img._width)),
-                                    (int)(align*(dy - img._height)),
-                                    (int)(align*(dz - img._depth)),
-                                    pos,
-                                    img);
-            pos+=img._spectrum;
-          }
-      }
-      }
-      return res;
-    }
-
-    //! Return a list where each image has been split along the specified axis.
-    /**
-        \param axis Axis to split images along.
-        \param nb Number of spliting parts for each image.
-    **/
-    CImgList<T>& split(const char axis, const int nb=-1) {
-      return get_split(axis,nb).move_to(*this);
-    }
-
-    //! Return a list where each image has been split along the specified axis \newinstance.
-    CImgList<T> get_split(const char axis, const int nb=-1) const {
-      CImgList<T> res;
-      cimglist_for(*this,l) _data[l].get_split(axis,nb).move_to(res,~0U);
-      return res;
-    }
-
-    //! Insert image at the end of the list.
-    /**
-      \param img Image to insert.
-    **/
-    template<typename t>
-    CImgList<T>& push_back(const CImg<t>& img) {
-      return insert(img);
-    }
-
-    //! Insert image at the front of the list.
-    /**
-      \param img Image to insert.
-    **/
-    template<typename t>
-    CImgList<T>& push_front(const CImg<t>& img) {
-      return insert(img,0);
-    }
-
-    //! Insert list at the end of the current list.
-    /**
-      \param list List to insert.
-    **/
-    template<typename t>
-    CImgList<T>& push_back(const CImgList<t>& list) {
-      return insert(list);
-    }
-
-    //! Insert list at the front of the current list.
-    /**
-      \param list List to insert.
-    **/
-    template<typename t>
-    CImgList<T>& push_front(const CImgList<t>& list) {
-      return insert(list,0);
-    }
-
-    //! Remove last image.
-    /**
-    **/
-    CImgList<T>& pop_back() {
-      return remove(_width - 1);
-    }
-
-    //! Remove first image.
-    /**
-    **/
-    CImgList<T>& pop_front() {
-      return remove(0);
-    }
-
-    //! Remove image pointed by iterator.
-    /**
-      \param iter Iterator pointing to the image to remove.
-    **/
-    CImgList<T>& erase(const iterator iter) {
-      return remove(iter - _data);
-    }
-
-    //@}
-    //----------------------------------
-    //
-    //! \name Data Input
-    //@{
-    //----------------------------------
-
-    //! Display a simple interactive interface to select images or sublists.
-    /**
-       \param disp Window instance to display selection and user interface.
-       \param feature_type Can be \c false to select a single image, or \c true to select a sublist.
-       \param axis Axis along whom images are appended for visualization.
-       \param align Alignment setting when images have not all the same size.
-       \return A one-column vector containing the selected image indexes.
-    **/
-    CImg<intT> get_select(CImgDisplay &disp, const bool feature_type=true,
-                          const char axis='x', const float align=0,
-                          const bool exit_on_anykey=false) const {
-      return _select(disp,0,feature_type,axis,align,exit_on_anykey,0,false,false,false);
-    }
-
-    //! Display a simple interactive interface to select images or sublists.
-    /**
-       \param title Title of a new window used to display selection and user interface.
-       \param feature_type Can be \c false to select a single image, or \c true to select a sublist.
-       \param axis Axis along whom images are appended for visualization.
-       \param align Alignment setting when images have not all the same size.
-       \return A one-column vector containing the selected image indexes.
-    **/
-    CImg<intT> get_select(const char *const title, const bool feature_type=true,
-                          const char axis='x', const float align=0,
-                          const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      return _select(disp,title,feature_type,axis,align,exit_on_anykey,0,false,false,false);
-    }
-
-    CImg<intT> _select(CImgDisplay &disp, const char *const title, const bool feature_type,
-                       const char axis, const float align, const bool exit_on_anykey,
-                       const unsigned int orig, const bool resize_disp,
-                       const bool exit_on_rightbutton, const bool exit_on_wheel) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "select(): Empty instance.",
-                                    cimglist_instance);
-
-      // Create image correspondence table and get list dimensions for visualization.
-      CImgList<uintT> _indices;
-      unsigned int max_width = 0, max_height = 0, sum_width = 0, sum_height = 0;
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        const unsigned int
-          w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,false),
-          h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,true);
-        if (w>max_width) max_width = w;
-        if (h>max_height) max_height = h;
-        sum_width+=w; sum_height+=h;
-        if (axis=='x') CImg<uintT>(w,1,1,1,(unsigned int)l).move_to(_indices);
-        else CImg<uintT>(h,1,1,1,(unsigned int)l).move_to(_indices);
-      }
-      const CImg<uintT> indices0 = _indices>'x';
-
-      // Create display window.
-      if (!disp) {
-        if (axis=='x') disp.assign(cimg_fitscreen(sum_width,max_height,1),title?title:0,1);
-        else disp.assign(cimg_fitscreen(max_width,sum_height,1),title?title:0,1);
-        if (!title) disp.set_title("CImgList<%s> (%u)",pixel_type(),_width);
-      } else if (title) disp.set_title("%s",title);
-      if (resize_disp) {
-        if (axis=='x') disp.resize(cimg_fitscreen(sum_width,max_height,1),false);
-        else disp.resize(cimg_fitscreen(max_width,sum_height,1),false);
-      }
-
-      const unsigned int old_normalization = disp.normalization();
-      bool old_is_resized = disp.is_resized();
-      disp._normalization = 0;
-      disp.show().set_key(0);
-      static const unsigned char foreground_color[] = { 255,255,255 }, background_color[] = { 0,0,0 };
-
-      // Enter event loop.
-      CImg<ucharT> visu0, visu;
-      CImg<uintT> indices;
-      CImg<intT> positions(_width,4,1,1,-1);
-      int oindice0 = -1, oindice1 = -1, indice0 = -1, indice1 = -1;
-      bool is_clicked = false, is_selected = false, text_down = false, update_display = true;
-      unsigned int key = 0;
-
-      while (!is_selected && !disp.is_closed() && !key) {
-
-        // Create background image.
-        if (!visu0) {
-          visu0.assign(disp._width,disp._height,1,3,0); visu.assign();
-          (indices0.get_resize(axis=='x'?visu0._width:visu0._height,1)).move_to(indices);
-          unsigned int ind = 0;
-          if (axis=='x') for (unsigned int x = 0; x<visu0._width; ) {
-              const unsigned int x0 = x;
-              ind = indices[x];
-              while (x<indices._width && indices[x++]==ind) {}
-              const CImg<T>
-                onexone(1,1,1,1,(T)0),
-                &src = _data[ind]?_data[ind]:onexone;
-              CImg<ucharT> res;
-              src.__get_select(disp,old_normalization,(src._width - 1)/2,(src._height - 1)/2,(src._depth - 1)/2).
-                move_to(res);
-              const unsigned int h = CImgDisplay::_fitscreen(res._width,res._height,1,128,-85,true);
-              res.resize(x - x0,std::max(32U,h*disp._height/max_height),1,res._spectrum==1?3:-100);
-              positions(ind,0) = positions(ind,2) = (int)x0;
-              positions(ind,1) = positions(ind,3) = (int)(align*(visu0.height() - res.height()));
-              positions(ind,2)+=res._width;
-              positions(ind,3)+=res._height - 1;
-              visu0.draw_image(positions(ind,0),positions(ind,1),res);
-            } else for (unsigned int y = 0; y<visu0._height; ) {
-              const unsigned int y0 = y;
-              ind = indices[y];
-              while (y<visu0._height && indices[++y]==ind) {}
-              const CImg<T> &src = _data[ind];
-              const CImg<Tuchar>
-                img2d = src._depth>1?src.get_projections2d((src._width - 1)/2,(src._height - 1)/2,(src._depth - 1)/2):
-                cimg::type<Tuchar>::string()==cimg::type<T>::string()?src.get_shared():src;
-              CImg<ucharT> res = old_normalization==1 ||
-                (old_normalization==3 && cimg::type<T>::string()!=cimg::type<unsigned char>::string())?
-                CImg<ucharT>(img2d.get_normalize((Tuchar)0,(Tuchar)255)):
-                CImg<ucharT>(img2d);
-              if (res._spectrum>3) res.channels(0,2);
-              const unsigned int w = CImgDisplay::_fitscreen(res._width,res._height,1,128,-85,false);
-              res.resize(std::max(32U,w*disp._width/max_width),y - y0,1,res._spectrum==1?3:-100);
-              positions(ind,0) = positions(ind,2) = (int)(align*(visu0.width() - res.width()));
-              positions(ind,1) = positions(ind,3) = (int)y0;
-              positions(ind,2)+=res._width - 1;
-              positions(ind,3)+=res._height;
-              visu0.draw_image(positions(ind,0),positions(ind,1),res);
-            }
-          if (axis=='x') --positions(ind,2); else --positions(ind,3);
-          update_display = true;
-        }
-
-        if (!visu || oindice0!=indice0 || oindice1!=indice1) {
-          if (indice0>=0 && indice1>=0) {
-            visu.assign(visu0,false);
-            const int indm = std::min(indice0,indice1), indM = std::max(indice0,indice1);
-            for (int ind = indm; ind<=indM; ++ind) if (positions(ind,0)>=0) {
-                visu.draw_rectangle(positions(ind,0),positions(ind,1),positions(ind,2),positions(ind,3),
-                                    background_color,0.2f);
-                if ((axis=='x' && positions(ind,2) - positions(ind,0)>=8) ||
-                    (axis!='x' && positions(ind,3) - positions(ind,1)>=8))
-                  visu.draw_rectangle(positions(ind,0),positions(ind,1),positions(ind,2),positions(ind,3),
-                                      foreground_color,0.9f,0xAAAAAAAA);
-              }
-            const int yt = (int)text_down?visu.height() - 13:0;
-            if (is_clicked) visu.draw_text(0,yt," Images #%u - #%u, Size = %u",
-                                           foreground_color,background_color,0.7f,13,
-                                           orig + indm,orig + indM,indM - indm + 1);
-            else visu.draw_text(0,yt," Image #%u (%u,%u,%u,%u)",foreground_color,background_color,0.7f,13,
-                                orig + indice0,
-                                _data[indice0]._width,
-                                _data[indice0]._height,
-                                _data[indice0]._depth,
-                                _data[indice0]._spectrum);
-            update_display = true;
-          } else visu.assign();
-        }
-        if (!visu) { visu.assign(visu0,true); update_display = true; }
-        if (update_display) { visu.display(disp); update_display = false; }
-        disp.wait();
-
-        // Manage user events.
-        const int xm = disp.mouse_x(), ym = disp.mouse_y();
-        int indice = -1;
-
-        if (xm>=0) {
-          indice = (int)indices(axis=='x'?xm:ym);
-          if (disp.button()&1) {
-            if (!is_clicked) { is_clicked = true; oindice0 = indice0; indice0 = indice; }
-            oindice1 = indice1; indice1 = indice;
-            if (!feature_type) is_selected = true;
-          } else {
-            if (!is_clicked) { oindice0 = oindice1 = indice0; indice0 = indice1 = indice; }
-            else is_selected = true;
-          }
-        } else {
-          if (is_clicked) {
-            if (!(disp.button()&1)) { is_clicked = is_selected = false; indice0 = indice1 = -1; }
-            else indice1 = -1;
-          } else indice0 = indice1 = -1;
-        }
-
-        if (disp.button()&4) { is_clicked = is_selected = false; indice0 = indice1 = -1; }
-        if (disp.button()&2 && exit_on_rightbutton) { is_selected = true; indice1 = indice0 = -1; }
-        if (disp.wheel() && exit_on_wheel) is_selected = true;
-
-        CImg<charT> filename(32);
-        switch (key = disp.key()) {
-#if cimg_OS!=2
-        case cimg::keyCTRLRIGHT :
-#endif
-        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
-        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
-                     CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
-              _is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.set_fullscreen(false).
-              resize(cimg_fitscreen(axis=='x'?sum_width:max_width,axis=='x'?max_height:sum_height,1),false).
-              _is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
-            disp.set_key(key,false); key = 0; visu0.assign();
-          } break;
-        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.bmp",snap_number++);
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            if (visu0) {
-              (+visu0).draw_text(0,0," Saving snapshot... ",
-                                 foreground_color,background_color,0.7f,13).display(disp);
-              visu0.save(filename);
-              (+visu0).draw_text(0,0," Snapshot '%s' saved. ",
-                                 foreground_color,background_color,0.7f,13,filename._data).display(disp);
-            }
-            disp.set_key(key,false).wait(); key = 0;
-          } break;
-        case cimg::keyO :
-          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
-            static unsigned int snap_number = 0;
-            std::FILE *file;
-            do {
-#ifdef cimg_use_zlib
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimgz",snap_number++);
-#else
-              cimg_snprintf(filename,filename._width,cimg_appname "_%.4u.cimg",snap_number++);
-#endif
-              if ((file=std_fopen(filename,"r"))!=0) cimg::fclose(file);
-            } while (file);
-            (+visu0).draw_text(0,0," Saving instance... ",
-                               foreground_color,background_color,0.7f,13).display(disp);
-            save(filename);
-            (+visu0).draw_text(0,0," Instance '%s' saved. ",
-                               foreground_color,background_color,0.7f,13,filename._data).display(disp);
-            disp.set_key(key,false).wait(); key = 0;
-          } break;
-        }
-        if (disp.is_resized()) { disp.resize(false); visu0.assign(); }
-        if (ym>=0 && ym<13) { if (!text_down) { visu.assign(); text_down = true; }}
-        else if (ym>=visu.height() - 13) { if (text_down) { visu.assign(); text_down = false; }}
-        if (!exit_on_anykey && key && key!=cimg::keyESC &&
-            (key!=cimg::keyW || (!disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT()))) {
-          key = 0;
-        }
-      }
-      CImg<intT> res(1,2,1,1,-1);
-      if (is_selected) {
-        if (feature_type) res.fill(std::min(indice0,indice1),std::max(indice0,indice1));
-        else res.fill(indice0);
-      }
-      if (!(disp.button()&2)) disp.set_button();
-      disp._normalization = old_normalization;
-      disp._is_resized = old_is_resized;
-      disp.set_key(key);
-      return res;
-    }
-
-    //! Load a list from a file.
-    /**
-     \param filename Filename to read data from.
-    **/
-    CImgList<T>& load(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load(): Specified filename is (null).",
-                                    cimglist_instance);
-
-      if (!cimg::strncasecmp(filename,"http://",7) || !cimg::strncasecmp(filename,"https://",8)) {
-        CImg<charT> filename_local(256);
-        load(cimg::load_network(filename,filename_local));
-        std::remove(filename_local);
-        return *this;
-      }
-
-      const bool is_stdin = *filename=='-' && (!filename[1] || filename[1]=='.');
-      const char *const ext = cimg::split_filename(filename);
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      bool is_loaded = true;
-      try {
-#ifdef cimglist_load_plugin
-        cimglist_load_plugin(filename);
-#endif
-#ifdef cimglist_load_plugin1
-        cimglist_load_plugin1(filename);
-#endif
-#ifdef cimglist_load_plugin2
-        cimglist_load_plugin2(filename);
-#endif
-#ifdef cimglist_load_plugin3
-        cimglist_load_plugin3(filename);
-#endif
-#ifdef cimglist_load_plugin4
-        cimglist_load_plugin4(filename);
-#endif
-#ifdef cimglist_load_plugin5
-        cimglist_load_plugin5(filename);
-#endif
-#ifdef cimglist_load_plugin6
-        cimglist_load_plugin6(filename);
-#endif
-#ifdef cimglist_load_plugin7
-        cimglist_load_plugin7(filename);
-#endif
-#ifdef cimglist_load_plugin8
-        cimglist_load_plugin8(filename);
-#endif
-        if (!cimg::strcasecmp(ext,"tif") ||
-            !cimg::strcasecmp(ext,"tiff")) load_tiff(filename);
-        else if (!cimg::strcasecmp(ext,"gif")) load_gif_external(filename);
-        else if (!cimg::strcasecmp(ext,"cimg") ||
-                 !cimg::strcasecmp(ext,"cimgz") ||
-                 !*ext) load_cimg(filename);
-        else if (!cimg::strcasecmp(ext,"rec") ||
-                 !cimg::strcasecmp(ext,"par")) load_parrec(filename);
-        else if (!cimg::strcasecmp(ext,"avi") ||
-                 !cimg::strcasecmp(ext,"mov") ||
-                 !cimg::strcasecmp(ext,"asf") ||
-                 !cimg::strcasecmp(ext,"divx") ||
-                 !cimg::strcasecmp(ext,"flv") ||
-                 !cimg::strcasecmp(ext,"mpg") ||
-                 !cimg::strcasecmp(ext,"m1v") ||
-                 !cimg::strcasecmp(ext,"m2v") ||
-                 !cimg::strcasecmp(ext,"m4v") ||
-                 !cimg::strcasecmp(ext,"mjp") ||
-                 !cimg::strcasecmp(ext,"mp4") ||
-                 !cimg::strcasecmp(ext,"mkv") ||
-                 !cimg::strcasecmp(ext,"mpe") ||
-                 !cimg::strcasecmp(ext,"movie") ||
-                 !cimg::strcasecmp(ext,"ogm") ||
-                 !cimg::strcasecmp(ext,"ogg") ||
-                 !cimg::strcasecmp(ext,"ogv") ||
-                 !cimg::strcasecmp(ext,"qt") ||
-                 !cimg::strcasecmp(ext,"rm") ||
-                 !cimg::strcasecmp(ext,"vob") ||
-                 !cimg::strcasecmp(ext,"wmv") ||
-                 !cimg::strcasecmp(ext,"xvid") ||
-                 !cimg::strcasecmp(ext,"mpeg")) load_video(filename);
-        else if (!cimg::strcasecmp(ext,"gz")) load_gzip_external(filename);
-        else is_loaded = false;
-      } catch (CImgIOException&) { is_loaded = false; }
-
-      // If nothing loaded, try to guess file format from magic number in file.
-      if (!is_loaded && !is_stdin) {
-        std::FILE *const file = std_fopen(filename,"rb");
-        if (!file) {
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimglist_instance
-                                "load(): Failed to open file '%s'.",
-                                cimglist_instance,
-                                filename);
-        }
-
-        const char *const f_type = cimg::ftype(file,filename);
-        std::fclose(file);
-        is_loaded = true;
-        try {
-          if (!cimg::strcasecmp(f_type,"gif")) load_gif_external(filename);
-          else if (!cimg::strcasecmp(f_type,"tif")) load_tiff(filename);
-          else is_loaded = false;
-        } catch (CImgIOException&) { is_loaded = false; }
-      }
-
-      // If nothing loaded, try to load file as a single image.
-      if (!is_loaded) {
-        assign(1);
-        try {
-          _data->load(filename);
-        } catch (CImgIOException&) {
-          cimg::exception_mode(omode);
-          throw CImgIOException(_cimglist_instance
-                                "load(): Failed to recognize format of file '%s'.",
-                                cimglist_instance,
-                                filename);
-        }
-      }
-      cimg::exception_mode(omode);
-      return *this;
-    }
-
-    //! Load a list from a file \newinstance.
-    static CImgList<T> get_load(const char *const filename) {
-      return CImgList<T>().load(filename);
-    }
-
-    //! Load a list from a .cimg file.
-    /**
-      \param filename Filename to read data from.
-    **/
-    CImgList<T>& load_cimg(const char *const filename) {
-      return _load_cimg(0,filename);
-    }
-
-    //! Load a list from a .cimg file \newinstance.
-    static CImgList<T> get_load_cimg(const char *const filename) {
-      return CImgList<T>().load_cimg(filename);
-    }
-
-    //! Load a list from a .cimg file.
-    /**
-      \param file File to read data from.
-    **/
-    CImgList<T>& load_cimg(std::FILE *const file) {
-      return _load_cimg(file,0);
-    }
-
-    //! Load a list from a .cimg file \newinstance.
-    static CImgList<T> get_load_cimg(std::FILE *const file) {
-      return CImgList<T>().load_cimg(file);
-    }
-
-    CImgList<T>& _load_cimg(std::FILE *const file, const char *const filename) {
-#ifdef cimg_use_zlib
-#define _cimgz_load_cimg_case(Tss) { \
-   Bytef *const cbuf = new Bytef[csiz]; \
-   cimg::fread(cbuf,csiz,nfile); \
-   raw.assign(W,H,D,C); \
-   uLongf destlen = (ulongT)raw.size()*sizeof(Tss); \
-   uncompress((Bytef*)raw._data,&destlen,cbuf,csiz); \
-   delete[] cbuf; \
-   if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw.size()); \
-   raw.move_to(img); \
-}
-#else
-#define _cimgz_load_cimg_case(Tss) \
-   throw CImgIOException(_cimglist_instance \
-                         "load_cimg(): Unable to load compressed data from file '%s' unless zlib is enabled.", \
-                         cimglist_instance, \
-                         filename?filename:"(FILE*)");
-#endif
-
-#define _cimg_load_cimg_case(Ts,Tss) \
-      if (!loaded && !cimg::strcasecmp(Ts,str_pixeltype)) { \
-        for (unsigned int l = 0; l<N; ++l) { \
-          j = 0; while ((i=std::fgetc(nfile))!='\n' && i>=0 && j<255) tmp[j++] = (char)i; tmp[j] = 0; \
-          W = H = D = C = 0; csiz = 0; \
-          if ((err = cimg_sscanf(tmp,"%u %u %u %u #%lu",&W,&H,&D,&C,&csiz))<4) \
-            throw CImgIOException(_cimglist_instance \
-                                  "load_cimg(): Invalid specified size (%u,%u,%u,%u) of image %u in file '%s'.", \
-                                  cimglist_instance, \
-                                  W,H,D,C,l,filename?filename:("(FILE*)")); \
-          if (W*H*D*C>0) { \
-            CImg<Tss> raw; \
-            CImg<T> &img = _data[l]; \
-            if (err==5) _cimgz_load_cimg_case(Tss) \
-            else { \
-              img.assign(W,H,D,C); \
-              T *ptrd = img._data; \
-              for (ulongT to_read = img.size(); to_read; ) { \
-                raw.assign((unsigned int)std::min(to_read,cimg_iobuffer)); \
-                cimg::fread(raw._data,raw._width,nfile); \
-                if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw.size()); \
-                const Tss *ptrs = raw._data; \
-                for (ulongT off = (ulongT)raw._width; off; --off) *(ptrd++) = (T)*(ptrs++); \
-                to_read-=raw._width; \
-              } \
-            } \
-          } \
-        } \
-        loaded = true; \
-      }
-
-      if (!filename && !file)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_cimg(): Specified filename is (null).",
-                                    cimglist_instance);
-
-      const ulongT cimg_iobuffer = (ulongT)24*1024*1024;
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      bool loaded = false, endian = cimg::endianness();
-      CImg<charT> tmp(256), str_pixeltype(256), str_endian(256);
-      *tmp = *str_pixeltype = *str_endian = 0;
-      unsigned int j, N = 0, W, H, D, C;
-      unsigned long csiz;
-      int i, err;
-      do {
-        j = 0; while ((i=std::fgetc(nfile))!='\n' && i>=0 && j<255) tmp[j++] = (char)i; tmp[j] = 0;
-      } while (*tmp=='#' && i>=0);
-      err = cimg_sscanf(tmp,"%u%*c%255[A-Za-z64_]%*c%255[sA-Za-z_ ]",
-                        &N,str_pixeltype._data,str_endian._data);
-      if (err<2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "load_cimg(): CImg header not found in file '%s'.",
-                              cimglist_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
-      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
-      assign(N);
-      _cimg_load_cimg_case("bool",bool);
-      _cimg_load_cimg_case("unsigned_char",unsigned char);
-      _cimg_load_cimg_case("uchar",unsigned char);
-      _cimg_load_cimg_case("char",char);
-      _cimg_load_cimg_case("unsigned_short",unsigned short);
-      _cimg_load_cimg_case("ushort",unsigned short);
-      _cimg_load_cimg_case("short",short);
-      _cimg_load_cimg_case("unsigned_int",unsigned int);
-      _cimg_load_cimg_case("uint",unsigned int);
-      _cimg_load_cimg_case("int",int);
-      _cimg_load_cimg_case("unsigned_long",ulongT);
-      _cimg_load_cimg_case("ulong",ulongT);
-      _cimg_load_cimg_case("long",longT);
-      _cimg_load_cimg_case("unsigned_int64",uint64T);
-      _cimg_load_cimg_case("uint64",uint64T);
-      _cimg_load_cimg_case("int64",int64T);
-      _cimg_load_cimg_case("float",float);
-      _cimg_load_cimg_case("double",double);
-
-      if (!loaded) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "load_cimg(): Unsupported pixel type '%s' for file '%s'.",
-                              cimglist_instance,
-                              str_pixeltype._data,filename?filename:"(FILE*)");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load a sublist list from a (non compressed) .cimg file.
-    /**
-      \param filename Filename to read data from.
-      \param n0 Starting index of images to read (~0U for max).
-      \param n1 Ending index of images to read (~0U for max).
-      \param x0 Starting X-coordinates of image regions to read.
-      \param y0 Starting Y-coordinates of image regions to read.
-      \param z0 Starting Z-coordinates of image regions to read.
-      \param c0 Starting C-coordinates of image regions to read.
-      \param x1 Ending X-coordinates of image regions to read (~0U for max).
-      \param y1 Ending Y-coordinates of image regions to read (~0U for max).
-      \param z1 Ending Z-coordinates of image regions to read (~0U for max).
-      \param c1 Ending C-coordinates of image regions to read (~0U for max).
-    **/
-    CImgList<T>& load_cimg(const char *const filename,
-                           const unsigned int n0, const unsigned int n1,
-                           const unsigned int x0, const unsigned int y0,
-                           const unsigned int z0, const unsigned int c0,
-                           const unsigned int x1, const unsigned int y1,
-                           const unsigned int z1, const unsigned int c1) {
-      return _load_cimg(0,filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-    }
-
-    //! Load a sublist list from a (non compressed) .cimg file \newinstance.
-    static CImgList<T> get_load_cimg(const char *const filename,
-                                     const unsigned int n0, const unsigned int n1,
-                                     const unsigned int x0, const unsigned int y0,
-                                     const unsigned int z0, const unsigned int c0,
-                                     const unsigned int x1, const unsigned int y1,
-                                     const unsigned int z1, const unsigned int c1) {
-      return CImgList<T>().load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-    }
-
-    //! Load a sub-image list from a (non compressed) .cimg file \overloading.
-    CImgList<T>& load_cimg(std::FILE *const file,
-                           const unsigned int n0, const unsigned int n1,
-                           const unsigned int x0, const unsigned int y0,
-                           const unsigned int z0, const unsigned int c0,
-                           const unsigned int x1, const unsigned int y1,
-                           const unsigned int z1, const unsigned int c1) {
-      return _load_cimg(file,0,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-    }
-
-    //! Load a sub-image list from a (non compressed) .cimg file \newinstance.
-    static CImgList<T> get_load_cimg(std::FILE *const file,
-                                     const unsigned int n0, const unsigned int n1,
-                                     const unsigned int x0, const unsigned int y0,
-                                     const unsigned int z0, const unsigned int c0,
-                                     const unsigned int x1, const unsigned int y1,
-                                     const unsigned int z1, const unsigned int c1) {
-      return CImgList<T>().load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
-    }
-
-    CImgList<T>& _load_cimg(std::FILE *const file, const char *const filename,
-                            const unsigned int n0, const unsigned int n1,
-                            const unsigned int x0, const unsigned int y0,
-                            const unsigned int z0, const unsigned int c0,
-                            const unsigned int x1, const unsigned int y1,
-                            const unsigned int z1, const unsigned int c1) {
-#define _cimg_load_cimg_case2(Ts,Tss) \
-      if (!loaded && !cimg::strcasecmp(Ts,str_pixeltype)) { \
-        for (unsigned int l = 0; l<=nn1; ++l) { \
-          j = 0; while ((i=std::fgetc(nfile))!='\n' && i>=0) tmp[j++] = (char)i; tmp[j] = 0; \
-          W = H = D = C = 0; \
-          if (cimg_sscanf(tmp,"%u %u %u %u",&W,&H,&D,&C)!=4) \
-            throw CImgIOException(_cimglist_instance \
-                                  "load_cimg(): Invalid specified size (%u,%u,%u,%u) of image %u in file '%s'", \
-                                  cimglist_instance, \
-                                  W,H,D,C,l,filename?filename:"(FILE*)"); \
-          if (W*H*D*C>0) { \
-            if (l<nn0 || nx0>=W || ny0>=H || nz0>=D || nc0>=C) cimg::fseek(nfile,W*H*D*C*sizeof(Tss),SEEK_CUR); \
-            else { \
-              const unsigned int \
-                _nx1 = nx1==~0U?W - 1:nx1, \
-                _ny1 = ny1==~0U?H - 1:ny1, \
-                _nz1 = nz1==~0U?D - 1:nz1, \
-                _nc1 = nc1==~0U?C - 1:nc1; \
-              if (_nx1>=W || _ny1>=H || _nz1>=D || _nc1>=C) \
-                throw CImgArgumentException(_cimglist_instance \
-                                            "load_cimg(): Invalid specified coordinates " \
-                                            "[%u](%u,%u,%u,%u) -> [%u](%u,%u,%u,%u) " \
-                                            "because image [%u] in file '%s' has size (%u,%u,%u,%u).", \
-                                            cimglist_instance, \
-                                            n0,x0,y0,z0,c0,n1,x1,y1,z1,c1,l,filename?filename:"(FILE*)",W,H,D,C); \
-              CImg<Tss> raw(1 + _nx1 - nx0); \
-              CImg<T> &img = _data[l - nn0]; \
-              img.assign(1 + _nx1 - nx0,1 + _ny1 - ny0,1 + _nz1 - nz0,1 + _nc1 - nc0); \
-              T *ptrd = img._data; \
-              ulongT skipvb = nc0*W*H*D*sizeof(Tss); \
-              if (skipvb) cimg::fseek(nfile,skipvb,SEEK_CUR); \
-              for (unsigned int c = 1 + _nc1 - nc0; c; --c) { \
-                const ulongT skipzb = nz0*W*H*sizeof(Tss); \
-                if (skipzb) cimg::fseek(nfile,skipzb,SEEK_CUR); \
-                for (unsigned int z = 1 + _nz1 - nz0; z; --z) { \
-                  const ulongT skipyb = ny0*W*sizeof(Tss); \
-                  if (skipyb) cimg::fseek(nfile,skipyb,SEEK_CUR); \
-                  for (unsigned int y = 1 + _ny1 - ny0; y; --y) { \
-                    const ulongT skipxb = nx0*sizeof(Tss); \
-                    if (skipxb) cimg::fseek(nfile,skipxb,SEEK_CUR); \
-                    cimg::fread(raw._data,raw._width,nfile); \
-                    if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw._width); \
-                    const Tss *ptrs = raw._data; \
-                    for (unsigned int off = raw._width; off; --off) *(ptrd++) = (T)*(ptrs++); \
-                    const ulongT skipxe = (W - 1 - _nx1)*sizeof(Tss); \
-                    if (skipxe) cimg::fseek(nfile,skipxe,SEEK_CUR); \
-                  } \
-                  const ulongT skipye = (H - 1 - _ny1)*W*sizeof(Tss); \
-                  if (skipye) cimg::fseek(nfile,skipye,SEEK_CUR); \
-                } \
-                const ulongT skipze = (D - 1 - _nz1)*W*H*sizeof(Tss); \
-                if (skipze) cimg::fseek(nfile,skipze,SEEK_CUR); \
-              } \
-              const ulongT skipve = (C - 1 - _nc1)*W*H*D*sizeof(Tss); \
-              if (skipve) cimg::fseek(nfile,skipve,SEEK_CUR); \
-            } \
-          } \
-        } \
-        loaded = true; \
-      }
-
-      if (!filename && !file)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_cimg(): Specified filename is (null).",
-                                    cimglist_instance);
-      unsigned int
-        nn0 = std::min(n0,n1), nn1 = std::max(n0,n1),
-        nx0 = std::min(x0,x1), nx1 = std::max(x0,x1),
-        ny0 = std::min(y0,y1), ny1 = std::max(y0,y1),
-        nz0 = std::min(z0,z1), nz1 = std::max(z0,z1),
-        nc0 = std::min(c0,c1), nc1 = std::max(c0,c1);
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      bool loaded = false, endian = cimg::endianness();
-      CImg<charT> tmp(256), str_pixeltype(256), str_endian(256);
-      *tmp = *str_pixeltype = *str_endian = 0;
-      unsigned int j, N, W, H, D, C;
-      int i, err;
-      j = 0; while ((i=std::fgetc(nfile))!='\n' && i!=EOF && j<256) tmp[j++] = (char)i; tmp[j] = 0;
-      err = cimg_sscanf(tmp,"%u%*c%255[A-Za-z64_]%*c%255[sA-Za-z_ ]",
-                        &N,str_pixeltype._data,str_endian._data);
-      if (err<2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "load_cimg(): CImg header not found in file '%s'.",
-                              cimglist_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
-      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
-      nn1 = n1==~0U?N - 1:n1;
-      if (nn1>=N)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_cimg(): Invalid specified coordinates [%u](%u,%u,%u,%u) -> [%u](%u,%u,%u,%u) "
-                                    "because file '%s' contains only %u images.",
-                                    cimglist_instance,
-                                    n0,x0,y0,z0,c0,n1,x1,y1,z1,c1,filename?filename:"(FILE*)",N);
-      assign(1 + nn1 - n0);
-      _cimg_load_cimg_case2("bool",bool);
-      _cimg_load_cimg_case2("unsigned_char",unsigned char);
-      _cimg_load_cimg_case2("uchar",unsigned char);
-      _cimg_load_cimg_case2("char",char);
-      _cimg_load_cimg_case2("unsigned_short",unsigned short);
-      _cimg_load_cimg_case2("ushort",unsigned short);
-      _cimg_load_cimg_case2("short",short);
-      _cimg_load_cimg_case2("unsigned_int",unsigned int);
-      _cimg_load_cimg_case2("uint",unsigned int);
-      _cimg_load_cimg_case2("int",int);
-      _cimg_load_cimg_case2("unsigned_long",ulongT);
-      _cimg_load_cimg_case2("ulong",ulongT);
-      _cimg_load_cimg_case2("long",longT);
-      _cimg_load_cimg_case2("unsigned_int64",uint64T);
-      _cimg_load_cimg_case2("uint64",uint64T);
-      _cimg_load_cimg_case2("int64",int64T);
-      _cimg_load_cimg_case2("float",float);
-      _cimg_load_cimg_case2("double",double);
-      if (!loaded) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "load_cimg(): Unsupported pixel type '%s' for file '%s'.",
-                              cimglist_instance,
-                              str_pixeltype._data,filename?filename:"(FILE*)");
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load a list from a PAR/REC (Philips) file.
-    /**
-      \param filename Filename to read data from.
-    **/
-    CImgList<T>& load_parrec(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_parrec(): Specified filename is (null).",
-                                    cimglist_instance);
-
-      CImg<charT> body(1024), filenamepar(1024), filenamerec(1024);
-      *body = *filenamepar = *filenamerec = 0;
-      const char *const ext = cimg::split_filename(filename,body);
-      if (!std::strcmp(ext,"par")) {
-        std::strncpy(filenamepar,filename,filenamepar._width - 1);
-        cimg_snprintf(filenamerec,filenamerec._width,"%s.rec",body._data);
-      }
-      if (!std::strcmp(ext,"PAR")) {
-        std::strncpy(filenamepar,filename,filenamepar._width - 1);
-        cimg_snprintf(filenamerec,filenamerec._width,"%s.REC",body._data);
-      }
-      if (!std::strcmp(ext,"rec")) {
-        std::strncpy(filenamerec,filename,filenamerec._width - 1);
-        cimg_snprintf(filenamepar,filenamepar._width,"%s.par",body._data);
-      }
-      if (!std::strcmp(ext,"REC")) {
-        std::strncpy(filenamerec,filename,filenamerec._width - 1);
-        cimg_snprintf(filenamepar,filenamepar._width,"%s.PAR",body._data);
-      }
-      std::FILE *file = cimg::fopen(filenamepar,"r");
-
-      // Parse header file
-      CImgList<floatT> st_slices;
-      CImgList<uintT> st_global;
-      CImg<charT> line(256); *line = 0;
-      int err;
-      do { err = std::fscanf(file,"%255[^\n]%*c",line._data); } while (err!=EOF && (*line=='#' || *line=='.'));
-      do {
-        unsigned int sn,size_x,size_y,pixsize;
-        float rs,ri,ss;
-        err = std::fscanf(file,"%u%*u%*u%*u%*u%*u%*u%u%*u%u%u%g%g%g%*[^\n]",&sn,&pixsize,&size_x,&size_y,&ri,&rs,&ss);
-        if (err==7) {
-          CImg<floatT>::vector((float)sn,(float)pixsize,(float)size_x,(float)size_y,ri,rs,ss,0).move_to(st_slices);
-          unsigned int i; for (i = 0; i<st_global._width && sn<=st_global[i][2]; ++i) {}
-          if (i==st_global._width) CImg<uintT>::vector(size_x,size_y,sn).move_to(st_global);
-          else {
-            CImg<uintT> &vec = st_global[i];
-            if (size_x>vec[0]) vec[0] = size_x;
-            if (size_y>vec[1]) vec[1] = size_y;
-            vec[2] = sn;
-          }
-          st_slices[st_slices._width - 1][7] = (float)i;
-        }
-      } while (err==7);
-
-      // Read data
-      std::FILE *file2 = cimg::fopen(filenamerec,"rb");
-      cimglist_for(st_global,l) {
-        const CImg<uintT>& vec = st_global[l];
-        CImg<T>(vec[0],vec[1],vec[2]).move_to(*this);
-      }
-
-      cimglist_for(st_slices,l) {
-        const CImg<floatT>& vec = st_slices[l];
-        const unsigned int
-          sn = (unsigned int)vec[0] - 1,
-          pixsize = (unsigned int)vec[1],
-          size_x = (unsigned int)vec[2],
-          size_y = (unsigned int)vec[3],
-          imn = (unsigned int)vec[7];
-        const float ri = vec[4], rs = vec[5], ss = vec[6];
-        switch (pixsize) {
-        case 8 : {
-          CImg<ucharT> buf(size_x,size_y);
-          cimg::fread(buf._data,size_x*size_y,file2);
-          if (cimg::endianness()) cimg::invert_endianness(buf._data,size_x*size_y);
-          CImg<T>& img = (*this)[imn];
-          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
-        } break;
-        case 16 : {
-          CImg<ushortT> buf(size_x,size_y);
-          cimg::fread(buf._data,size_x*size_y,file2);
-          if (cimg::endianness()) cimg::invert_endianness(buf._data,size_x*size_y);
-          CImg<T>& img = (*this)[imn];
-          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
-        } break;
-        case 32 : {
-          CImg<uintT> buf(size_x,size_y);
-          cimg::fread(buf._data,size_x*size_y,file2);
-          if (cimg::endianness()) cimg::invert_endianness(buf._data,size_x*size_y);
-          CImg<T>& img = (*this)[imn];
-          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
-        } break;
-        default :
-          cimg::fclose(file);
-          cimg::fclose(file2);
-          throw CImgIOException(_cimglist_instance
-                                "load_parrec(): Unsupported %d-bits pixel type for file '%s'.",
-                                cimglist_instance,
-                                pixsize,filename);
-        }
-      }
-      cimg::fclose(file);
-      cimg::fclose(file2);
-      if (!_width)
-        throw CImgIOException(_cimglist_instance
-                              "load_parrec(): Failed to recognize valid PAR-REC data in file '%s'.",
-                              cimglist_instance,
-                              filename);
-      return *this;
-    }
-
-    //! Load a list from a PAR/REC (Philips) file \newinstance.
-    static CImgList<T> get_load_parrec(const char *const filename) {
-      return CImgList<T>().load_parrec(filename);
-    }
-
-    //! Load a list from a YUV image sequence file.
-    /**
-        \param filename Filename to read data from.
-        \param size_x Width of the images.
-        \param size_y Height of the images.
-        \param first_frame Index of first image frame to read.
-        \param last_frame Index of last image frame to read.
-        \param step_frame Step applied between each frame.
-        \param yuv2rgb Apply YUV to RGB transformation during reading.
-    **/
-    CImgList<T>& load_yuv(const char *const filename,
-                          const unsigned int size_x, const unsigned int size_y,
-                          const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                          const unsigned int step_frame=1, const bool yuv2rgb=true) {
-      return _load_yuv(0,filename,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb);
-    }
-
-    //! Load a list from a YUV image sequence file \newinstance.
-    static CImgList<T> get_load_yuv(const char *const filename,
-                                    const unsigned int size_x, const unsigned int size_y=1,
-                                    const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                    const unsigned int step_frame=1, const bool yuv2rgb=true) {
-      return CImgList<T>().load_yuv(filename,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb);
-    }
-
-    //! Load a list from an image sequence YUV file \overloading.
-    CImgList<T>& load_yuv(std::FILE *const file,
-                          const unsigned int size_x, const unsigned int size_y,
-                          const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                          const unsigned int step_frame=1, const bool yuv2rgb=true) {
-      return _load_yuv(file,0,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb);
-    }
-
-    //! Load a list from an image sequence YUV file \newinstance.
-    static CImgList<T> get_load_yuv(std::FILE *const file,
-                                    const unsigned int size_x, const unsigned int size_y=1,
-                                    const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                    const unsigned int step_frame=1, const bool yuv2rgb=true) {
-      return CImgList<T>().load_yuv(file,size_x,size_y,first_frame,last_frame,step_frame,yuv2rgb);
-    }
-
-    CImgList<T>& _load_yuv(std::FILE *const file, const char *const filename,
-                           const unsigned int size_x, const unsigned int size_y,
-                           const unsigned int first_frame, const unsigned int last_frame,
-                           const unsigned int step_frame, const bool yuv2rgb) {
-      if (!filename && !file)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_yuv(): Specified filename is (null).",
-                                    cimglist_instance);
-      if (size_x%2 || size_y%2)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_yuv(): Invalid odd XY dimensions %ux%u in file '%s'.",
-                                    cimglist_instance,
-                                    size_x,size_y,filename?filename:"(FILE*)");
-      if (!size_x || !size_y)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_yuv(): Invalid sequence size (%u,%u) in file '%s'.",
-                                    cimglist_instance,
-                                    size_x,size_y,filename?filename:"(FILE*)");
-
-      const unsigned int
-        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
-        nlast_frame = first_frame<last_frame?last_frame:first_frame,
-        nstep_frame = step_frame?step_frame:1;
-
-      CImg<ucharT> tmp(size_x,size_y,1,3), UV(size_x/2,size_y/2,1,2);
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
-      bool stop_flag = false;
-      int err;
-      if (nfirst_frame) {
-        err = cimg::fseek(nfile,nfirst_frame*(size_x*size_y + size_x*size_y/2),SEEK_CUR);
-        if (err) {
-          if (!file) cimg::fclose(nfile);
-          throw CImgIOException(_cimglist_instance
-                                "load_yuv(): File '%s' doesn't contain frame number %u.",
-                                cimglist_instance,
-                                filename?filename:"(FILE*)",nfirst_frame);
-        }
-      }
-      unsigned int frame;
-      for (frame = nfirst_frame; !stop_flag && frame<=nlast_frame; frame+=nstep_frame) {
-        tmp.fill(0);
-        // *TRY* to read the luminance part, do not replace by cimg::fread!
-        err = (int)std::fread((void*)(tmp._data),1,(ulongT)tmp._width*tmp._height,nfile);
-        if (err!=(int)(tmp._width*tmp._height)) {
-          stop_flag = true;
-          if (err>0)
-            cimg::warn(_cimglist_instance
-                       "load_yuv(): File '%s' contains incomplete data or given image dimensions "
-                       "(%u,%u) are incorrect.",
-                       cimglist_instance,
-                       filename?filename:"(FILE*)",size_x,size_y);
-        } else {
-          UV.fill(0);
-          // *TRY* to read the luminance part, do not replace by cimg::fread!
-          err = (int)std::fread((void*)(UV._data),1,(size_t)(UV.size()),nfile);
-          if (err!=(int)(UV.size())) {
-            stop_flag = true;
-            if (err>0)
-              cimg::warn(_cimglist_instance
-                         "load_yuv(): File '%s' contains incomplete data or given image dimensions (%u,%u) "
-                         "are incorrect.",
-                         cimglist_instance,
-                         filename?filename:"(FILE*)",size_x,size_y);
-          } else {
-            cimg_forXY(UV,x,y) {
-              const int x2 = x*2, y2 = y*2;
-              tmp(x2,y2,1) = tmp(x2 + 1,y2,1) = tmp(x2,y2 + 1,1) = tmp(x2 + 1,y2 + 1,1) = UV(x,y,0);
-              tmp(x2,y2,2) = tmp(x2 + 1,y2,2) = tmp(x2,y2 + 1,2) = tmp(x2 + 1,y2 + 1,2) = UV(x,y,1);
-            }
-            if (yuv2rgb) tmp.YCbCrtoRGB();
-            insert(tmp);
-            if (nstep_frame>1) cimg::fseek(nfile,(nstep_frame - 1)*(size_x*size_y + size_x*size_y/2),SEEK_CUR);
-          }
-        }
-      }
-      if (stop_flag && nlast_frame!=~0U && frame!=nlast_frame)
-        cimg::warn(_cimglist_instance
-                   "load_yuv(): Frame %d not reached since only %u frames were found in file '%s'.",
-                   cimglist_instance,
-                   nlast_frame,frame - 1,filename?filename:"(FILE*)");
-
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Load an image from a video file, using OpenCV library.
-    /**
-      \param filename Filename, as a C-string.
-      \param first_frame Index of the first frame to read.
-      \param last_frame Index of the last frame to read.
-      \param step_frame Step value for frame reading.
-      \note If step_frame==0, the current video stream is forced to be released (without any frames read).
-    **/
-    CImgList<T>& load_video(const char *const filename,
-                            const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                            const unsigned int step_frame=1) {
-#ifndef cimg_use_opencv
-      if (first_frame || last_frame!=~0U || step_frame>1)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_video() : File '%s', arguments 'first_frame', 'last_frame' "
-                                    "and 'step_frame' can be only set when using OpenCV "
-                                    "(-Dcimg_use_opencv must be enabled).",
-                                    cimglist_instance,filename);
-      return load_ffmpeg_external(filename);
-#else
-      static CvCapture *captures[32] = { 0 };
-      static CImgList<charT> filenames(32);
-      static CImg<uintT> positions(32,1,1,1,0);
-      static int last_used_index = -1;
-
-      // Detect if a video capture already exists for the specified filename.
-      cimg::mutex(9);
-      int index = -1;
-      if (filename) {
-        if (last_used_index>=0 && !std::strcmp(filename,filenames[last_used_index])) {
-          index = last_used_index;
-        } else cimglist_for(filenames,l) if (filenames[l] && !std::strcmp(filename,filenames[l])) {
-            index = l; break;
-          }
-      } else index = last_used_index;
-      cimg::mutex(9,0);
-
-      // Release stream if needed.
-      if (!step_frame || (index>=0 && positions[index]>first_frame)) {
-        if (index>=0) {
-          cimg::mutex(9);
-          cvReleaseCapture(&captures[index]);
-          captures[index] = 0; filenames[index].assign(); positions[index] = 0;
-          if (last_used_index==index) last_used_index = -1;
-          index = -1;
-          cimg::mutex(9,0);
-        } else
-          if (filename)
-            cimg::warn(_cimglist_instance
-                       "load_video() : File '%s', no opened video stream associated with filename found.",
-                       cimglist_instance,filename);
-          else
-            cimg::warn(_cimglist_instance
-                       "load_video() : No opened video stream found.",
-                       cimglist_instance,filename);
-        if (!step_frame) return *this;
-      }
-
-      // Find empty slot for capturing video stream.
-      if (index<0) {
-        if (!filename)
-          throw CImgArgumentException(_cimglist_instance
-                                      "load_video(): No already open video reader found. You must specify a "
-                                      "non-(null) filename argument for the first call.",
-                                      cimglist_instance);
-        else { cimg::mutex(9); cimglist_for(filenames,l) if (!filenames[l]) { index = l; break; } cimg::mutex(9,0); }
-        if (index<0)
-          throw CImgIOException(_cimglist_instance
-                                "load_video(): File '%s', no video reader slots available. "
-                                "You have to release some of your previously opened videos.",
-                                cimglist_instance,filename);
-        cimg::mutex(9);
-        captures[index] = cvCaptureFromFile(filename);
-        CImg<charT>::string(filename).move_to(filenames[index]);
-        positions[index] = 0;
-        cimg::mutex(9,0);
-        if (!captures[index]) {
-          filenames[index].assign();
-          std::fclose(cimg::fopen(filename,"rb"));  // Check file availability.
-          throw CImgIOException(_cimglist_instance
-                                "load_video(): File '%s', unable to detect format of video file.",
-                                cimglist_instance,filename);
-        }
-      }
-
-      cimg::mutex(9);
-      const unsigned int nb_frames = (unsigned int)std::max(0.,cvGetCaptureProperty(captures[index],
-                                                                                     CV_CAP_PROP_FRAME_COUNT));
-      cimg::mutex(9,0);
-      assign();
-
-      // Skip frames if necessary.
-      bool go_on = true;
-      unsigned int &pos = positions[index];
-      while (pos<first_frame) {
-        cimg::mutex(9);
-        if (!cvGrabFrame(captures[index])) { cimg::mutex(9,0); go_on = false; break; }
-        cimg::mutex(9,0);
-        ++pos;
-      }
-
-      // Read and convert frames.
-      const IplImage *src = 0;
-      if (go_on) {
-        const unsigned int _last_frame = std::min(nb_frames?nb_frames - 1:~0U,last_frame);
-        while (pos<=_last_frame) {
-          cimg::mutex(9);
-          src = cvQueryFrame(captures[index]);
-          if (src) {
-            CImg<T> frame(src->width,src->height,1,3);
-            const int step = (int)(src->widthStep - 3*src->width);
-            const unsigned char* ptrs = (unsigned char*)src->imageData;
-            T *ptr_r = frame.data(0,0,0,0), *ptr_g = frame.data(0,0,0,1), *ptr_b = frame.data(0,0,0,2);
-            if (step>0) cimg_forY(frame,y) {
-                cimg_forX(frame,x) { *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++); }
-                ptrs+=step;
-              } else for (ulongT siz = (ulongT)src->width*src->height; siz; --siz) {
-                *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++);
-              }
-            frame.move_to(*this);
-            ++pos;
-
-            bool skip_failed = false;
-            for (unsigned int i = 1; i<step_frame && pos<=_last_frame; ++i, ++pos)
-              if (!cvGrabFrame(captures[index])) { skip_failed = true; break; }
-            if (skip_failed) src = 0;
-          }
-          cimg::mutex(9,0);
-          if (!src) break;
-        }
-      }
-
-      if (!src || (nb_frames && pos>=nb_frames)) { // Close video stream when necessary.
-        cimg::mutex(9);
-        cvReleaseCapture(&captures[index]);
-        captures[index] = 0;
-        filenames[index].assign();
-        positions[index] = 0;
-        index = -1;
-        cimg::mutex(9,0);
-      }
-
-      cimg::mutex(9);
-      last_used_index = index;
-      cimg::mutex(9,0);
-
-      if (is_empty())
-        throw CImgIOException(_cimglist_instance
-                              "load_video(): File '%s', unable to locate frame %u.",
-                              cimglist_instance,filename,first_frame);
-      return *this;
-#endif
-    }
-
-    //! Load an image from a video file, using OpenCV library \newinstance.
-    static CImgList<T> get_load_video(const char *const filename,
-                           const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                           const unsigned int step_frame=1) {
-      return CImgList<T>().load_video(filename,first_frame,last_frame,step_frame);
-    }
-
-    //! Load an image from a video file using the external tool 'ffmpeg'.
-    /**
-      \param filename Filename to read data from.
-    **/
-    CImgList<T>& load_ffmpeg_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_ffmpeg_external(): Specified filename is (null).",
-                                    cimglist_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256), filename_tmp2(256);
-      std::FILE *file = 0;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_000001.ppm",filename_tmp._data);
-        if ((file=std_fopen(filename_tmp2,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_%%6d.ppm",filename_tmp._data);
-#if cimg_OS!=2
-      cimg_snprintf(command,command._width,"%s -i \"%s\" \"%s\" >/dev/null 2>&1",
-                    cimg::ffmpeg_path(),
-                    CImg<charT>::string(filename)._system_strescape().data(),
-                    CImg<charT>::string(filename_tmp2)._system_strescape().data());
-#else
-      cimg_snprintf(command,command._width,"\"%s -i \"%s\" \"%s\"\" >NUL 2>&1",
-                    cimg::ffmpeg_path(),
-                    CImg<charT>::string(filename)._system_strescape().data(),
-                    CImg<charT>::string(filename_tmp2)._system_strescape().data());
-#endif
-      cimg::system(command,0);
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      assign();
-      unsigned int i = 1;
-      for (bool stop_flag = false; !stop_flag; ++i) {
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_%.6u.ppm",filename_tmp._data,i);
-        CImg<T> img;
-        try { img.load_pnm(filename_tmp2); }
-        catch (CImgException&) { stop_flag = true; }
-        if (img) { img.move_to(*this); std::remove(filename_tmp2); }
-      }
-      cimg::exception_mode(omode);
-      if (is_empty())
-        throw CImgIOException(_cimglist_instance
-                              "load_ffmpeg_external(): Failed to open file '%s' with external command 'ffmpeg'.",
-                              cimglist_instance,
-                              filename);
-      return *this;
-    }
-
-    //! Load an image from a video file using the external tool 'ffmpeg' \newinstance.
-    static CImgList<T> get_load_ffmpeg_external(const char *const filename) {
-      return CImgList<T>().load_ffmpeg_external(filename);
-    }
-
-    //! Load gif file, using ImageMagick or GraphicsMagick's external tools.
-    /**
-      \param filename Filename to read data from.
-      \param use_graphicsmagick Tells if GraphicsMagick's tool 'gm' is used instead of ImageMagick's tool 'convert'.
-    **/
-    CImgList<T>& load_gif_external(const char *const filename) {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_gif_external(): Specified filename is (null).",
-                                    cimglist_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      if (!_load_gif_external(filename,false))
-        if (!_load_gif_external(filename,true))
-          try { assign(CImg<T>().load_other(filename)); } catch (CImgException&) { assign(); }
-      if (is_empty())
-        throw CImgIOException(_cimglist_instance
-                              "load_gif_external(): Failed to open file '%s'.",
-                              cimglist_instance,filename);
-      return *this;
-    }
-
-    CImgList<T>& _load_gif_external(const char *const filename, const bool use_graphicsmagick=false) {
-      CImg<charT> command(1024), filename_tmp(256), filename_tmp2(256);
-      std::FILE *file = 0;
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        if (use_graphicsmagick) cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s.png.0",filename_tmp._data);
-        else cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s-0.png",filename_tmp._data);
-        if ((file=std_fopen(filename_tmp2,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-#if cimg_OS!=2
-      if (use_graphicsmagick) cimg_snprintf(command,command._width,"%s convert \"%s\" \"%s.png\" >/dev/null 2>&1",
-                                            cimg::graphicsmagick_path(),
-                                            CImg<charT>::string(filename)._system_strescape().data(),
-                                            CImg<charT>::string(filename_tmp)._system_strescape().data());
-      else cimg_snprintf(command,command._width,"%s \"%s\" \"%s.png\" >/dev/null 2>&1",
-                         cimg::imagemagick_path(),
-                         CImg<charT>::string(filename)._system_strescape().data(),
-                         CImg<charT>::string(filename_tmp)._system_strescape().data());
-#else
-      if (use_graphicsmagick) cimg_snprintf(command,command._width,"\"%s convert \"%s\" \"%s.png\"\" >NUL 2>&1",
-                                            cimg::graphicsmagick_path(),
-                                            CImg<charT>::string(filename)._system_strescape().data(),
-                                            CImg<charT>::string(filename_tmp)._system_strescape().data());
-      else cimg_snprintf(command,command._width,"\"%s \"%s\" \"%s.png\"\" >NUL 2>&1",
-                         cimg::imagemagick_path(),
-                         CImg<charT>::string(filename)._system_strescape().data(),
-                         CImg<charT>::string(filename_tmp)._system_strescape().data());
-#endif
-      cimg::system(command,0);
-      const unsigned int omode = cimg::exception_mode();
-      cimg::exception_mode(0);
-      assign();
-
-      // Try to read a single frame gif.
-      cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s.png",filename_tmp._data);
-      CImg<T> img;
-      try { img.load_png(filename_tmp2); }
-      catch (CImgException&) { }
-      if (img) { img.move_to(*this); std::remove(filename_tmp2); }
-      else { // Try to read animated gif.
-        unsigned int i = 0;
-        for (bool stop_flag = false; !stop_flag; ++i) {
-          if (use_graphicsmagick) cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s.png.%u",filename_tmp._data,i);
-          else cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s-%u.png",filename_tmp._data,i);
-          CImg<T> img;
-          try { img.load_png(filename_tmp2); }
-          catch (CImgException&) { stop_flag = true; }
-          if (img) { img.move_to(*this); std::remove(filename_tmp2); }
-        }
-      }
-      cimg::exception_mode(omode);
-      return *this;
-    }
-
-    //! Load gif file, using ImageMagick or GraphicsMagick's external tools \newinstance.
-    static CImgList<T> get_load_gif_external(const char *const filename) {
-      return CImgList<T>().load_gif_external(filename);
-    }
-
-    //! Load a gzipped list, using external tool 'gunzip'.
-    /**
-      \param filename Filename to read data from.
-    **/
-    CImgList<T>& load_gzip_external(const char *const filename) {
-      if (!filename)
-        throw CImgIOException(_cimglist_instance
-                              "load_gzip_external(): Specified filename is (null).",
-                              cimglist_instance);
-      std::fclose(cimg::fopen(filename,"rb"));            // Check if file exists.
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      const char
-        *ext = cimg::split_filename(filename,body),
-        *ext2 = cimg::split_filename(body,0);
-      std::FILE *file = 0;
-      do {
-        if (!cimg::strcasecmp(ext,"gz")) {
-          if (*ext2) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                   cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        } else {
-          if (*ext) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                  cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        }
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimg_snprintf(command,command._width,"%s -c \"%s\" > \"%s\"",
-                    cimg::gunzip_path(),
-                    CImg<charT>::string(filename)._system_strescape().data(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data());
-      cimg::system(command);
-      if (!(file = std_fopen(filename_tmp,"rb"))) {
-        cimg::fclose(cimg::fopen(filename,"r"));
-        throw CImgIOException(_cimglist_instance
-                              "load_gzip_external(): Failed to open file '%s'.",
-                              cimglist_instance,
-                              filename);
-
-      } else cimg::fclose(file);
-      load(filename_tmp);
-      std::remove(filename_tmp);
-      return *this;
-    }
-
-    //! Load a gzipped list, using external tool 'gunzip' \newinstance.
-    static CImgList<T> get_load_gzip_external(const char *const filename) {
-      return CImgList<T>().load_gzip_external(filename);
-    }
-
-    //! Load a 3d object from a .OFF file.
-    /**
-      \param filename Filename to read data from.
-      \param[out] primitives At return, contains the list of 3d object primitives.
-      \param[out] colors At return, contains the list of 3d object colors.
-      \return List of 3d object vertices.
-    **/
-    template<typename tf, typename tc>
-    CImgList<T>& load_off(const char *const filename,
-                          CImgList<tf>& primitives, CImgList<tc>& colors) {
-      return get_load_off(filename,primitives,colors).move_to(*this);
-    }
-
-    //! Load a 3d object from a .OFF file \newinstance.
-    template<typename tf, typename tc>
-      static CImgList<T> get_load_off(const char *const filename,
-                                      CImgList<tf>& primitives, CImgList<tc>& colors) {
-      return CImg<T>().load_off(filename,primitives,colors)<'x';
-    }
-
-    //! Load images from a TIFF file.
-    /**
-        \param filename Filename to read data from.
-        \param first_frame Index of first image frame to read.
-        \param last_frame Index of last image frame to read.
-        \param step_frame Step applied between each frame.
-    **/
-    CImgList<T>& load_tiff(const char *const filename,
-                           const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                           const unsigned int step_frame=1,
-                           float *const voxel_size=0,
-                           CImg<charT> *const description=0) {
-      const unsigned int
-        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
-        nstep_frame = step_frame?step_frame:1;
-      unsigned int nlast_frame = first_frame<last_frame?last_frame:first_frame;
-#ifndef cimg_use_tiff
-      cimg::unused(voxel_size,description);
-      if (nfirst_frame || nlast_frame!=~0U || nstep_frame!=1)
-        throw CImgArgumentException(_cimglist_instance
-                                    "load_tiff(): Unable to load sub-images from file '%s' unless libtiff is enabled.",
-                                    cimglist_instance,
-                                    filename);
-
-      return assign(CImg<T>::get_load_tiff(filename));
-#else
-#if cimg_verbosity<3
-        TIFFSetWarningHandler(0);
-        TIFFSetErrorHandler(0);
-#endif
-      TIFF *tif = TIFFOpen(filename,"r");
-      if (tif) {
-        unsigned int nb_images = 0;
-        do ++nb_images; while (TIFFReadDirectory(tif));
-        if (nfirst_frame>=nb_images || (nlast_frame!=~0U && nlast_frame>=nb_images))
-          cimg::warn(_cimglist_instance
-                     "load_tiff(): Invalid specified frame range is [%u,%u] (step %u) since "
-                     "file '%s' contains %u image(s).",
-                     cimglist_instance,
-                     nfirst_frame,nlast_frame,nstep_frame,filename,nb_images);
-
-        if (nfirst_frame>=nb_images) return assign();
-        if (nlast_frame>=nb_images) nlast_frame = nb_images - 1;
-        assign(1 + (nlast_frame - nfirst_frame)/nstep_frame);
-        TIFFSetDirectory(tif,0);
-        cimglist_for(*this,l) _data[l]._load_tiff(tif,nfirst_frame + l*nstep_frame,voxel_size,description);
-        TIFFClose(tif);
-      } else throw CImgIOException(_cimglist_instance
-                                   "load_tiff(): Failed to open file '%s'.",
-                                   cimglist_instance,
-                                   filename);
-      return *this;
-#endif
-    }
-
-    //! Load a multi-page TIFF file \newinstance.
-    static CImgList<T> get_load_tiff(const char *const filename,
-                                     const unsigned int first_frame=0, const unsigned int last_frame=~0U,
-                                     const unsigned int step_frame=1,
-                                     float *const voxel_size=0,
-                                     CImg<charT> *const description=0) {
-      return CImgList<T>().load_tiff(filename,first_frame,last_frame,step_frame,voxel_size,description);
-    }
-
-    //@}
-    //----------------------------------
-    //
-    //! \name Data Output
-    //@{
-    //----------------------------------
-
-    //! Print information about the list on the standard output.
-    /**
-      \param title Label set to the information displayed.
-      \param display_stats Tells if image statistics must be computed and displayed.
-    **/
-    const CImgList<T>& print(const char *const title=0, const bool display_stats=true) const {
-      unsigned int msiz = 0;
-      cimglist_for(*this,l) msiz+=_data[l].size();
-      msiz*=sizeof(T);
-      const unsigned int mdisp = msiz<8*1024?0U:msiz<8*1024*1024?1U:2U;
-      CImg<charT> _title(64);
-      if (!title) cimg_snprintf(_title,_title._width,"CImgList<%s>",pixel_type());
-      std::fprintf(cimg::output(),"%s%s%s%s: %sthis%s = %p, %ssize%s = %u/%u [%u %s], %sdata%s = (CImg<%s>*)%p",
-                   cimg::t_magenta,cimg::t_bold,title?title:_title._data,cimg::t_normal,
-                   cimg::t_bold,cimg::t_normal,(void*)this,
-                   cimg::t_bold,cimg::t_normal,_width,_allocated_width,
-                   mdisp==0?msiz:(mdisp==1?(msiz>>10):(msiz>>20)),
-                   mdisp==0?"b":(mdisp==1?"Kio":"Mio"),
-                   cimg::t_bold,cimg::t_normal,pixel_type(),(void*)begin());
-      if (_data) std::fprintf(cimg::output(),"..%p.\n",(void*)((char*)end() - 1));
-      else std::fprintf(cimg::output(),".\n");
-
-      char tmp[16] = { 0 };
-      cimglist_for(*this,ll) {
-        cimg_snprintf(tmp,sizeof(tmp),"[%d]",ll);
-        std::fprintf(cimg::output(),"  ");
-        _data[ll].print(tmp,display_stats);
-        if (ll==3 && width()>8) { ll = width() - 5; std::fprintf(cimg::output(),"  ...\n"); }
-      }
-      std::fflush(cimg::output());
-      return *this;
-    }
-
-    //! Display the current CImgList instance in an existing CImgDisplay window (by reference).
-    /**
-       \param disp Reference to an existing CImgDisplay instance, where the current image list will be displayed.
-       \param axis Appending axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-       \param align Appending alignmenet.
-       \note This function displays the list images of the current CImgList instance into an existing
-         CImgDisplay window.
-       Images of the list are appended in a single temporarly image for visualization purposes.
-       The function returns immediately.
-    **/
-    const CImgList<T>& display(CImgDisplay &disp, const char axis='x', const float align=0) const {
-      disp.display(*this,axis,align);
-      return *this;
-    }
-
-    //! Display the current CImgList instance in a new display window.
-    /**
-        \param disp Display window.
-        \param display_info Tells if image information are displayed on the standard output.
-       \param axis Alignment axis for images viewing.
-       \param align Apending alignment.
-       \note This function opens a new window with a specific title and displays the list images of the
-         current CImgList instance into it.
-       Images of the list are appended in a single temporarly image for visualization purposes.
-       The function returns when a key is pressed or the display window is closed by the user.
-    **/
-    const CImgList<T>& display(CImgDisplay &disp, const bool display_info,
-                               const char axis='x', const float align=0,
-                               unsigned int *const XYZ=0, const bool exit_on_anykey=false) const {
-      bool is_exit = false;
-      return _display(disp,0,0,display_info,axis,align,XYZ,exit_on_anykey,0,true,is_exit);
-    }
-
-    //! Display the current CImgList instance in a new display window.
-    /**
-      \param title Title of the opening display window.
-      \param display_info Tells if list information must be written on standard output.
-      \param axis Appending axis. Can be <tt>{ 'x' | 'y' | 'z' | 'c' }</tt>.
-      \param align Appending alignment.
-    **/
-    const CImgList<T>& display(const char *const title=0, const bool display_info=true,
-                               const char axis='x', const float align=0,
-                               unsigned int *const XYZ=0, const bool exit_on_anykey=false) const {
-      CImgDisplay disp;
-      bool is_exit = false;
-      return _display(disp,title,0,display_info,axis,align,XYZ,exit_on_anykey,0,true,is_exit);
-    }
-
-    const CImgList<T>& _display(CImgDisplay &disp, const char *const title, const CImgList<charT> *const titles,
-                                const bool display_info, const char axis, const float align, unsigned int *const XYZ,
-                                const bool exit_on_anykey, const unsigned int orig, const bool is_first_call,
-                                bool &is_exit) const {
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "display(): Empty instance.",
-                                    cimglist_instance);
-      if (!disp) {
-        if (axis=='x') {
-          unsigned int sum_width = 0, max_height = 0;
-          cimglist_for(*this,l) {
-            const CImg<T> &img = _data[l];
-            const unsigned int
-              w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,false),
-              h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,true);
-            sum_width+=w;
-            if (h>max_height) max_height = h;
-          }
-          disp.assign(cimg_fitscreen(sum_width,max_height,1),title?title:titles?titles->__display()._data:0,1);
-        } else {
-          unsigned int max_width = 0, sum_height = 0;
-          cimglist_for(*this,l) {
-            const CImg<T> &img = _data[l];
-            const unsigned int
-              w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,false),
-              h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,128,-85,true);
-            if (w>max_width) max_width = w;
-            sum_height+=h;
-          }
-          disp.assign(cimg_fitscreen(max_width,sum_height,1),title?title:titles?titles->__display()._data:0,1);
-        }
-        if (!title && !titles) disp.set_title("CImgList<%s> (%u)",pixel_type(),_width);
-      } else if (title) disp.set_title("%s",title);
-      else if (titles) disp.set_title("%s",titles->__display()._data);
-      const CImg<char> dtitle = CImg<char>::string(disp.title());
-      if (display_info) print(disp.title());
-      disp.show().flush();
-
-      if (_width==1) {
-        const unsigned int dw = disp._width, dh = disp._height;
-        if (!is_first_call)
-          disp.resize(cimg_fitscreen(_data[0]._width,_data[0]._height,_data[0]._depth),false);
-        disp.set_title("%s (%ux%ux%ux%u)",
-                       dtitle.data(),_data[0]._width,_data[0]._height,_data[0]._depth,_data[0]._spectrum);
-        _data[0]._display(disp,0,false,XYZ,exit_on_anykey,!is_first_call);
-        if (disp.key()) is_exit = true;
-        disp.resize(cimg_fitscreen(dw,dh,1),false).set_title("%s",dtitle.data());
-      } else {
-        bool disp_resize = !is_first_call;
-        while (!disp.is_closed() && !is_exit) {
-          const CImg<intT> s = _select(disp,0,true,axis,align,exit_on_anykey,orig,disp_resize,!is_first_call,true);
-          disp_resize = true;
-          if (s[0]<0 && !disp.wheel()) { // No selections done.
-            if (disp.button()&2) { disp.flush(); break; }
-            is_exit = true;
-          } else if (disp.wheel()) { // Zoom in/out.
-            const int wheel = disp.wheel();
-            disp.set_wheel();
-            if (!is_first_call && wheel<0) break;
-            if (wheel>0 && _width>=4) {
-              const unsigned int
-                delta = std::max(1U,(unsigned int)cimg::round(0.3*_width)),
-                ind0 = (unsigned int)std::max(0,s[0] - (int)delta),
-                ind1 = (unsigned int)std::min(width() - 1,s[0] + (int)delta);
-              if ((ind0!=0 || ind1!=_width - 1) && ind1 - ind0>=3) {
-                const CImgList<T> sublist = get_shared_images(ind0,ind1);
-                CImgList<charT> t_sublist;
-                if (titles) t_sublist = titles->get_shared_images(ind0,ind1);
-                sublist._display(disp,0,titles?&t_sublist:0,false,axis,align,XYZ,exit_on_anykey,
-                                 orig + ind0,false,is_exit);
-              }
-            }
-          } else if (s[0]!=0 || s[1]!=width() - 1) {
-            const CImgList<T> sublist = get_shared_images(s[0],s[1]);
-            CImgList<charT> t_sublist;
-            if (titles) t_sublist = titles->get_shared_images(s[0],s[1]);
-            sublist._display(disp,0,titles?&t_sublist:0,false,axis,align,XYZ,exit_on_anykey,
-                             orig + s[0],false,is_exit);
-          }
-          disp.set_title("%s",dtitle.data());
-        }
-      }
-      return *this;
-    }
-
-    // [internal] Return string to describe display title.
-    CImg<charT> __display() const {
-      CImg<charT> res, str;
-      cimglist_for(*this,l) {
-        CImg<charT>::string(_data[l]).move_to(str);
-        if (l!=width() - 1) {
-          str.resize(str._width + 1,1,1,1,0);
-          str[str._width - 2] = ',';
-          str[str._width - 1] = ' ';
-        }
-        res.append(str,'x');
-      }
-      if (!res) return CImg<charT>(1,1,1,1,0).move_to(res);
-      cimg::strellipsize(res,128,false);
-      if (_width>1) {
-        const unsigned int l = (unsigned int)std::strlen(res);
-        if (res._width<=l + 16) res.resize(l + 16,1,1,1,0);
-        cimg_snprintf(res._data + l,16," (#%u)",_width);
-      }
-      return res;
-    }
-
-    //! Save list into a file.
-    /**
-      \param filename Filename to write data to.
-      \param number When positive, represents an index added to the filename. Otherwise, no number is added.
-      \param digits Number of digits used for adding the number to the filename.
-    **/
-    const CImgList<T>& save(const char *const filename, const int number=-1, const unsigned int digits=6) const {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save(): Specified filename is (null).",
-                                    cimglist_instance);
-      // Do not test for empty instances, since .cimg format is able to manage empty instances.
-      const bool is_stdout = *filename=='-' && (!filename[1] || filename[1]=='.');
-      const char *const ext = cimg::split_filename(filename);
-      CImg<charT> nfilename(1024);
-      const char *const fn = is_stdout?filename:number>=0?cimg::number_filename(filename,number,digits,nfilename):
-        filename;
-
-#ifdef cimglist_save_plugin
-      cimglist_save_plugin(fn);
-#endif
-#ifdef cimglist_save_plugin1
-      cimglist_save_plugin1(fn);
-#endif
-#ifdef cimglist_save_plugin2
-      cimglist_save_plugin2(fn);
-#endif
-#ifdef cimglist_save_plugin3
-      cimglist_save_plugin3(fn);
-#endif
-#ifdef cimglist_save_plugin4
-      cimglist_save_plugin4(fn);
-#endif
-#ifdef cimglist_save_plugin5
-      cimglist_save_plugin5(fn);
-#endif
-#ifdef cimglist_save_plugin6
-      cimglist_save_plugin6(fn);
-#endif
-#ifdef cimglist_save_plugin7
-      cimglist_save_plugin7(fn);
-#endif
-#ifdef cimglist_save_plugin8
-      cimglist_save_plugin8(fn);
-#endif
-      if (!cimg::strcasecmp(ext,"cimgz")) return save_cimg(fn,true);
-      else if (!cimg::strcasecmp(ext,"cimg") || !*ext) return save_cimg(fn,false);
-      else if (!cimg::strcasecmp(ext,"yuv")) return save_yuv(fn,true);
-      else if (!cimg::strcasecmp(ext,"avi") ||
-               !cimg::strcasecmp(ext,"mov") ||
-               !cimg::strcasecmp(ext,"asf") ||
-               !cimg::strcasecmp(ext,"divx") ||
-               !cimg::strcasecmp(ext,"flv") ||
-               !cimg::strcasecmp(ext,"mpg") ||
-               !cimg::strcasecmp(ext,"m1v") ||
-               !cimg::strcasecmp(ext,"m2v") ||
-               !cimg::strcasecmp(ext,"m4v") ||
-               !cimg::strcasecmp(ext,"mjp") ||
-               !cimg::strcasecmp(ext,"mp4") ||
-               !cimg::strcasecmp(ext,"mkv") ||
-               !cimg::strcasecmp(ext,"mpe") ||
-               !cimg::strcasecmp(ext,"movie") ||
-               !cimg::strcasecmp(ext,"ogm") ||
-               !cimg::strcasecmp(ext,"ogg") ||
-               !cimg::strcasecmp(ext,"ogv") ||
-               !cimg::strcasecmp(ext,"qt") ||
-               !cimg::strcasecmp(ext,"rm") ||
-               !cimg::strcasecmp(ext,"vob") ||
-               !cimg::strcasecmp(ext,"wmv") ||
-               !cimg::strcasecmp(ext,"xvid") ||
-               !cimg::strcasecmp(ext,"mpeg")) return save_video(fn);
-#ifdef cimg_use_tiff
-      else if (!cimg::strcasecmp(ext,"tif") ||
-          !cimg::strcasecmp(ext,"tiff")) return save_tiff(fn);
-#endif
-      else if (!cimg::strcasecmp(ext,"gz")) return save_gzip_external(fn);
-      else {
-        if (_width==1) _data[0].save(fn,-1);
-        else cimglist_for(*this,l) { _data[l].save(fn,is_stdout?-1:l); if (is_stdout) std::fputc(EOF,cimg::_stdout()); }
-      }
-      return *this;
-    }
-
-    //! Tell if an image list can be saved as one single file.
-    /**
-       \param filename Filename, as a C-string.
-       \return \c true if the file format supports multiple images, \c false otherwise.
-    **/
-    static bool is_saveable(const char *const filename) {
-      const char *const ext = cimg::split_filename(filename);
-      if (!cimg::strcasecmp(ext,"cimgz") ||
-#ifdef cimg_use_tiff
-          !cimg::strcasecmp(ext,"tif") ||
-          !cimg::strcasecmp(ext,"tiff") ||
-#endif
-          !cimg::strcasecmp(ext,"yuv") ||
-          !cimg::strcasecmp(ext,"avi") ||
-          !cimg::strcasecmp(ext,"mov") ||
-          !cimg::strcasecmp(ext,"asf") ||
-          !cimg::strcasecmp(ext,"divx") ||
-          !cimg::strcasecmp(ext,"flv") ||
-          !cimg::strcasecmp(ext,"mpg") ||
-          !cimg::strcasecmp(ext,"m1v") ||
-          !cimg::strcasecmp(ext,"m2v") ||
-          !cimg::strcasecmp(ext,"m4v") ||
-          !cimg::strcasecmp(ext,"mjp") ||
-          !cimg::strcasecmp(ext,"mp4") ||
-          !cimg::strcasecmp(ext,"mkv") ||
-          !cimg::strcasecmp(ext,"mpe") ||
-          !cimg::strcasecmp(ext,"movie") ||
-          !cimg::strcasecmp(ext,"ogm") ||
-          !cimg::strcasecmp(ext,"ogg") ||
-          !cimg::strcasecmp(ext,"ogv") ||
-          !cimg::strcasecmp(ext,"qt") ||
-          !cimg::strcasecmp(ext,"rm") ||
-          !cimg::strcasecmp(ext,"vob") ||
-          !cimg::strcasecmp(ext,"wmv") ||
-          !cimg::strcasecmp(ext,"xvid") ||
-          !cimg::strcasecmp(ext,"mpeg")) return true;
-      return false;
-    }
-
-    //! Save image sequence as a GIF animated file.
-    /**
-       \param filename Filename to write data to.
-       \param fps Number of desired frames per second.
-       \param nb_loops Number of loops (\c 0 for infinite looping).
-    **/
-    const CImgList<T>& save_gif_external(const char *const filename, const float fps=25,
-                                         const unsigned int nb_loops=0) {
-      CImg<charT> command(1024), filename_tmp(256), filename_tmp2(256);
-      CImgList<charT> filenames;
-      std::FILE *file = 0;
-
-#ifdef cimg_use_png
-#define _cimg_save_gif_ext "png"
-#else
-#define _cimg_save_gif_ext "ppm"
-#endif
-
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_000001." _cimg_save_gif_ext,filename_tmp._data);
-        if ((file=std_fopen(filename_tmp2,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimglist_for(*this,l) {
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_%.6u." _cimg_save_gif_ext,filename_tmp._data,l + 1);
-        CImg<charT>::string(filename_tmp2).move_to(filenames);
-        if (_data[l]._depth>1 || _data[l]._spectrum!=3) _data[l].get_resize(-100,-100,1,3).save(filename_tmp2);
-        else _data[l].save(filename_tmp2);
-      }
-
-#if cimg_OS!=2
-      cimg_snprintf(command,command._width,"%s -delay %u -loop %u",
-                    cimg::imagemagick_path(),(unsigned int)std::max(0.0f,cimg::round(100/fps)),nb_loops);
-      CImg<ucharT>::string(command).move_to(filenames,0);
-      cimg_snprintf(command,command._width,"\"%s\" >/dev/null 2>&1",
-                    CImg<charT>::string(filename)._system_strescape().data());
-      CImg<ucharT>::string(command).move_to(filenames);
-#else
-      cimg_snprintf(command,command._width,"\"%s -delay %u -loop %u",
-                    cimg::imagemagick_path(),(unsigned int)std::max(0.0f,cimg::round(100/fps)),nb_loops);
-      CImg<ucharT>::string(command).move_to(filenames,0);
-      cimg_snprintf(command,command._width,"\"%s\"\" >NUL 2>&1",
-                    CImg<charT>::string(filename)._system_strescape().data());
-      CImg<ucharT>::string(command).move_to(filenames);
-#endif
-      CImg<charT> _command = filenames>'x';
-      cimg_for(_command,p,char) if (!*p) *p = ' ';
-      _command.back() = 0;
-
-      cimg::system(_command);
-      file = std_fopen(filename,"rb");
-      if (!file)
-        throw CImgIOException(_cimglist_instance
-                              "save_gif_external(): Failed to save file '%s' with external command 'convert'.",
-                              cimglist_instance,
-                              filename);
-      else cimg::fclose(file);
-      cimglist_for_in(*this,1,filenames._width - 1,l) std::remove(filenames[l]);
-      return *this;
-    }
-
-    const CImgList<T>& _save_yuv(std::FILE *const file, const char *const filename, const bool is_rgb) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save_yuv(): Specified filename is (null).",
-                                    cimglist_instance);
-      if (is_empty()) { cimg::fempty(file,filename); return *this; }
-      if ((*this)[0].width()%2 || (*this)[0].height()%2)
-        throw CImgInstanceException(_cimglist_instance
-                                    "save_yuv(): Invalid odd instance dimensions (%u,%u) for file '%s'.",
-                                    cimglist_instance,
-                                    (*this)[0].width(),(*this)[0].height(),
-                                    filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      cimglist_for(*this,l) {
-        CImg<ucharT> YCbCr((*this)[l]);
-        if (is_rgb) YCbCr.RGBtoYCbCr();
-        cimg::fwrite(YCbCr._data,(size_t)YCbCr._width*YCbCr._height,nfile);
-        cimg::fwrite(YCbCr.get_resize(YCbCr._width/2, YCbCr._height/2,1,3,3).data(0,0,0,1),
-                     (size_t)YCbCr._width*YCbCr._height/2,nfile);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save list as a YUV image sequence file.
-    /**
-      \param filename Filename to write data to.
-      \param is_rgb Tells if the RGB to YUV conversion must be done for saving.
-    **/
-    const CImgList<T>& save_yuv(const char *const filename=0, const bool is_rgb=true) const {
-      return _save_yuv(0,filename,is_rgb);
-    }
-
-    //! Save image sequence into a YUV file.
-    /**
-      \param file File to write data to.
-      \param is_rgb Tells if the RGB to YUV conversion must be done for saving.
-    **/
-    const CImgList<T>& save_yuv(std::FILE *const file, const bool is_rgb=true) const {
-      return _save_yuv(file,0,is_rgb);
-    }
-
-    const CImgList<T>& _save_cimg(std::FILE *const file, const char *const filename, const bool is_compressed) const {
-      if (!file && !filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save_cimg(): Specified filename is (null).",
-                                    cimglist_instance);
-#ifndef cimg_use_zlib
-      if (is_compressed)
-        cimg::warn(_cimglist_instance
-                   "save_cimg(): Unable to save compressed data in file '%s' unless zlib is enabled, "
-                   "saving them uncompressed.",
-                   cimglist_instance,
-                   filename?filename:"(FILE*)");
-#endif
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const char *const ptype = pixel_type(), *const etype = cimg::endianness()?"big":"little";
-      if (std::strstr(ptype,"unsigned")==ptype) std::fprintf(nfile,"%u unsigned_%s %s_endian\n",_width,ptype + 9,etype);
-      else std::fprintf(nfile,"%u %s %s_endian\n",_width,ptype,etype);
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        std::fprintf(nfile,"%u %u %u %u",img._width,img._height,img._depth,img._spectrum);
-        if (img._data) {
-          CImg<T> tmp;
-          if (cimg::endianness()) { tmp = img; cimg::invert_endianness(tmp._data,tmp.size()); }
-          const CImg<T>& ref = cimg::endianness()?tmp:img;
-          bool failed_to_compress = true;
-          if (is_compressed) {
-#ifdef cimg_use_zlib
-            const ulongT siz = sizeof(T)*ref.size();
-            uLongf csiz = siz + siz/100 + 16;
-            Bytef *const cbuf = new Bytef[csiz];
-            if (compress(cbuf,&csiz,(Bytef*)ref._data,siz))
-              cimg::warn(_cimglist_instance
-                         "save_cimg(): Failed to save compressed data for file '%s', saving them uncompressed.",
-                         cimglist_instance,
-                         filename?filename:"(FILE*)");
-            else {
-              std::fprintf(nfile," #%lu\n",csiz);
-              cimg::fwrite(cbuf,csiz,nfile);
-              delete[] cbuf;
-              failed_to_compress = false;
-            }
-#endif
-          }
-          if (failed_to_compress) { // Write in a non-compressed way.
-            std::fputc('\n',nfile);
-            cimg::fwrite(ref._data,ref.size(),nfile);
-          }
-        } else std::fputc('\n',nfile);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Save list into a .cimg file.
-    /**
-       \param filename Filename to write data to.
-       \param is_compressed Tells if data compression must be enabled.
-    **/
-    const CImgList<T>& save_cimg(const char *const filename, const bool is_compressed=false) const {
-      return _save_cimg(0,filename,is_compressed);
-    }
-
-    //! Save list into a .cimg file.
-    /**
-       \param file File to write data to.
-       \param is_compressed Tells if data compression must be enabled.
-    **/
-    const CImgList<T>& save_cimg(std::FILE *file, const bool is_compressed=false) const {
-      return _save_cimg(file,0,is_compressed);
-    }
-
-    const CImgList<T>& _save_cimg(std::FILE *const file, const char *const filename,
-                                 const unsigned int n0,
-                                 const unsigned int x0, const unsigned int y0,
-                                 const unsigned int z0, const unsigned int c0) const {
-#define _cimg_save_cimg_case(Ts,Tss) \
-      if (!saved && !cimg::strcasecmp(Ts,str_pixeltype)) { \
-        for (unsigned int l = 0; l<lmax; ++l) { \
-          j = 0; while ((i=std::fgetc(nfile))!='\n') tmp[j++]=(char)i; tmp[j] = 0; \
-          W = H = D = C = 0; \
-          if (cimg_sscanf(tmp,"%u %u %u %u",&W,&H,&D,&C)!=4) \
-            throw CImgIOException(_cimglist_instance \
-                                  "save_cimg(): Invalid size (%u,%u,%u,%u) of image[%u], for file '%s'.", \
-                                  cimglist_instance, \
-                                  W,H,D,C,l,filename?filename:"(FILE*)"); \
-          if (W*H*D*C>0) { \
-            if (l<n0 || x0>=W || y0>=H || z0>=D || c0>=D) cimg::fseek(nfile,W*H*D*C*sizeof(Tss),SEEK_CUR); \
-            else { \
-              const CImg<T>& img = (*this)[l - n0]; \
-              const T *ptrs = img._data; \
-              const unsigned int \
-                x1 = x0 + img._width - 1, \
-                y1 = y0 + img._height - 1, \
-                z1 = z0 + img._depth - 1, \
-                c1 = c0 + img._spectrum - 1, \
-                nx1 = x1>=W?W - 1:x1, \
-                ny1 = y1>=H?H - 1:y1, \
-                nz1 = z1>=D?D - 1:z1, \
-                nc1 = c1>=C?C - 1:c1; \
-              CImg<Tss> raw(1 + nx1 - x0); \
-              const unsigned int skipvb = c0*W*H*D*sizeof(Tss); \
-              if (skipvb) cimg::fseek(nfile,skipvb,SEEK_CUR); \
-              for (unsigned int v = 1 + nc1 - c0; v; --v) { \
-                const unsigned int skipzb = z0*W*H*sizeof(Tss); \
-                if (skipzb) cimg::fseek(nfile,skipzb,SEEK_CUR); \
-                for (unsigned int z = 1 + nz1 - z0; z; --z) { \
-                  const unsigned int skipyb = y0*W*sizeof(Tss); \
-                  if (skipyb) cimg::fseek(nfile,skipyb,SEEK_CUR); \
-                  for (unsigned int y = 1 + ny1 - y0; y; --y) { \
-                    const unsigned int skipxb = x0*sizeof(Tss); \
-                    if (skipxb) cimg::fseek(nfile,skipxb,SEEK_CUR); \
-                    raw.assign(ptrs, raw._width); \
-                    ptrs+=img._width; \
-                    if (endian) cimg::invert_endianness(raw._data,raw._width); \
-                    cimg::fwrite(raw._data,raw._width,nfile); \
-                    const unsigned int skipxe = (W - 1 - nx1)*sizeof(Tss); \
-                    if (skipxe) cimg::fseek(nfile,skipxe,SEEK_CUR); \
-                  } \
-                  const unsigned int skipye = (H - 1 - ny1)*W*sizeof(Tss); \
-                  if (skipye) cimg::fseek(nfile,skipye,SEEK_CUR); \
-                } \
-                const unsigned int skipze = (D - 1 - nz1)*W*H*sizeof(Tss); \
-                if (skipze) cimg::fseek(nfile,skipze,SEEK_CUR); \
-              } \
-              const unsigned int skipve = (C - 1 - nc1)*W*H*D*sizeof(Tss); \
-              if (skipve) cimg::fseek(nfile,skipve,SEEK_CUR); \
-            } \
-          } \
-        } \
-        saved = true; \
-      }
-
-      if (!file && !filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save_cimg(): Specified filename is (null).",
-                                    cimglist_instance);
-      if (is_empty())
-        throw CImgInstanceException(_cimglist_instance
-                                    "save_cimg(): Empty instance, for file '%s'.",
-                                    cimglist_instance,
-                                    filename?filename:"(FILE*)");
-
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb+");
-      bool saved = false, endian = cimg::endianness();
-      CImg<charT> tmp(256), str_pixeltype(256), str_endian(256);
-      *tmp = *str_pixeltype = *str_endian = 0;
-      unsigned int j, N, W, H, D, C;
-      int i, err;
-      j = 0; while ((i=std::fgetc(nfile))!='\n' && i!=EOF && j<256) tmp[j++] = (char)i; tmp[j] = 0;
-      err = cimg_sscanf(tmp,"%u%*c%255[A-Za-z64_]%*c%255[sA-Za-z_ ]",&N,str_pixeltype._data,str_endian._data);
-      if (err<2) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "save_cimg(): CImg header not found in file '%s'.",
-                              cimglist_instance,
-                              filename?filename:"(FILE*)");
-      }
-      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
-      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
-      const unsigned int lmax = std::min(N,n0 + _width);
-      _cimg_save_cimg_case("bool",bool);
-      _cimg_save_cimg_case("unsigned_char",unsigned char);
-      _cimg_save_cimg_case("uchar",unsigned char);
-      _cimg_save_cimg_case("char",char);
-      _cimg_save_cimg_case("unsigned_short",unsigned short);
-      _cimg_save_cimg_case("ushort",unsigned short);
-      _cimg_save_cimg_case("short",short);
-      _cimg_save_cimg_case("unsigned_int",unsigned int);
-      _cimg_save_cimg_case("uint",unsigned int);
-      _cimg_save_cimg_case("int",int);
-      _cimg_save_cimg_case("unsigned_int64",uint64T);
-      _cimg_save_cimg_case("uint64",uint64T);
-      _cimg_save_cimg_case("int64",int64T);
-      _cimg_save_cimg_case("float",float);
-      _cimg_save_cimg_case("double",double);
-      if (!saved) {
-        if (!file) cimg::fclose(nfile);
-        throw CImgIOException(_cimglist_instance
-                              "save_cimg(): Unsupported data type '%s' for file '%s'.",
-                              cimglist_instance,
-                              filename?filename:"(FILE*)",str_pixeltype._data);
-      }
-      if (!file) cimg::fclose(nfile);
-      return *this;
-    }
-
-    //! Insert the image instance into into an existing .cimg file, at specified coordinates.
-    /**
-      \param filename Filename to write data to.
-      \param n0 Starting index of images to write.
-      \param x0 Starting X-coordinates of image regions to write.
-      \param y0 Starting Y-coordinates of image regions to write.
-      \param z0 Starting Z-coordinates of image regions to write.
-      \param c0 Starting C-coordinates of image regions to write.
-    **/
-    const CImgList<T>& save_cimg(const char *const filename,
-                                 const unsigned int n0,
-                                 const unsigned int x0, const unsigned int y0,
-                                 const unsigned int z0, const unsigned int c0) const {
-      return _save_cimg(0,filename,n0,x0,y0,z0,c0);
-    }
-
-    //! Insert the image instance into into an existing .cimg file, at specified coordinates.
-    /**
-      \param file File to write data to.
-      \param n0 Starting index of images to write.
-      \param x0 Starting X-coordinates of image regions to write.
-      \param y0 Starting Y-coordinates of image regions to write.
-      \param z0 Starting Z-coordinates of image regions to write.
-      \param c0 Starting C-coordinates of image regions to write.
-    **/
-    const CImgList<T>& save_cimg(std::FILE *const file,
-                                 const unsigned int n0,
-                                 const unsigned int x0, const unsigned int y0,
-                                 const unsigned int z0, const unsigned int c0) const {
-      return _save_cimg(file,0,n0,x0,y0,z0,c0);
-    }
-
-    static void _save_empty_cimg(std::FILE *const file, const char *const filename,
-                                const unsigned int nb,
-                                const unsigned int dx, const unsigned int dy,
-                                const unsigned int dz, const unsigned int dc) {
-      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
-      const ulongT siz = (ulongT)dx*dy*dz*dc*sizeof(T);
-      std::fprintf(nfile,"%u %s\n",nb,pixel_type());
-      for (unsigned int i=nb; i; --i) {
-        std::fprintf(nfile,"%u %u %u %u\n",dx,dy,dz,dc);
-        for (ulongT off = siz; off; --off) std::fputc(0,nfile);
-      }
-      if (!file) cimg::fclose(nfile);
-    }
-
-    //! Save empty (non-compressed) .cimg file with specified dimensions.
-    /**
-        \param filename Filename to write data to.
-        \param nb Number of images to write.
-        \param dx Width of images in the written file.
-        \param dy Height of images in the written file.
-        \param dz Depth of images in the written file.
-        \param dc Spectrum of images in the written file.
-    **/
-    static void save_empty_cimg(const char *const filename,
-                                const unsigned int nb,
-                                const unsigned int dx, const unsigned int dy=1,
-                                const unsigned int dz=1, const unsigned int dc=1) {
-      return _save_empty_cimg(0,filename,nb,dx,dy,dz,dc);
-    }
-
-    //! Save empty .cimg file with specified dimensions.
-    /**
-        \param file File to write data to.
-        \param nb Number of images to write.
-        \param dx Width of images in the written file.
-        \param dy Height of images in the written file.
-        \param dz Depth of images in the written file.
-        \param dc Spectrum of images in the written file.
-    **/
-    static void save_empty_cimg(std::FILE *const file,
-                                const unsigned int nb,
-                                const unsigned int dx, const unsigned int dy=1,
-                                const unsigned int dz=1, const unsigned int dc=1) {
-      return _save_empty_cimg(file,0,nb,dx,dy,dz,dc);
-    }
-
-    //! Save list as a TIFF file.
-    /**
-      \param filename Filename to write data to.
-      \param compression_type Compression mode used to write data.
-    **/
-    const CImgList<T>& save_tiff(const char *const filename, const unsigned int compression_type=0,
-                                 const float *const voxel_size=0, const char *const description=0,
-                                 const bool use_bigtiff=true) const {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save_tiff(): Specified filename is (null).",
-                                    cimglist_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-#ifndef cimg_use_tiff
-      if (_width==1) _data[0].save_tiff(filename,compression_type,voxel_size,description,use_bigtiff);
-      else cimglist_for(*this,l) {
-          CImg<charT> nfilename(1024);
-          cimg::number_filename(filename,l,6,nfilename);
-          _data[l].save_tiff(nfilename,compression_type,voxel_size,description,use_bigtiff);
-        }
-#else
-      ulongT siz = 0;
-      cimglist_for(*this,l) siz+=_data[l].size();
-      const bool _use_bigtiff = use_bigtiff && sizeof(siz)>=8 && siz*sizeof(T)>=1UL<<31; // No bigtiff for small images.
-      TIFF *tif = TIFFOpen(filename,_use_bigtiff?"w8":"w4");
-      if (tif) {
-        for (unsigned int dir = 0, l = 0; l<_width; ++l) {
-          const CImg<T>& img = (*this)[l];
-          cimg_forZ(img,z) img._save_tiff(tif,dir++,z,compression_type,voxel_size,description);
-        }
-        TIFFClose(tif);
-      } else
-        throw CImgIOException(_cimglist_instance
-                              "save_tiff(): Failed to open stream for file '%s'.",
-                              cimglist_instance,
-                              filename);
-#endif
-      return *this;
-    }
-
-    //! Save list as a gzipped file, using external tool 'gzip'.
-    /**
-      \param filename Filename to write data to.
-    **/
-    const CImgList<T>& save_gzip_external(const char *const filename) const {
-      if (!filename)
-        throw CImgIOException(_cimglist_instance
-                              "save_gzip_external(): Specified filename is (null).",
-                              cimglist_instance);
-      CImg<charT> command(1024), filename_tmp(256), body(256);
-      const char
-        *ext = cimg::split_filename(filename,body),
-        *ext2 = cimg::split_filename(body,0);
-      std::FILE *file;
-      do {
-        if (!cimg::strcasecmp(ext,"gz")) {
-          if (*ext2) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                   cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.cimg",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        } else {
-          if (*ext) cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.%s",
-                                  cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
-          else cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s.cimg",
-                             cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        }
-        if ((file=std_fopen(filename_tmp,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-
-      if (is_saveable(body)) {
-        save(filename_tmp);
-        cimg_snprintf(command,command._width,"%s -c \"%s\" > \"%s\"",
-                      cimg::gzip_path(),
-                      CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                      CImg<charT>::string(filename)._system_strescape().data());
-        cimg::system(command);
-        file = std_fopen(filename,"rb");
-        if (!file)
-          throw CImgIOException(_cimglist_instance
-                                "save_gzip_external(): Failed to save file '%s' with external command 'gzip'.",
-                                cimglist_instance,
-                                filename);
-        else cimg::fclose(file);
-        std::remove(filename_tmp);
-      } else {
-        CImg<charT> nfilename(1024);
-        cimglist_for(*this,l) {
-          cimg::number_filename(body,l,6,nfilename);
-          if (*ext) cimg_sprintf(nfilename._data + std::strlen(nfilename),".%s",ext);
-          _data[l].save_gzip_external(nfilename);
-        }
-      }
-      return *this;
-    }
-
-    //! Save image sequence, using the OpenCV library.
-    /**
-       \param filename Filename to write data to.
-       \param fps Number of frames per second.
-       \param codec Type of compression (See http://www.fourcc.org/codecs.php to see available codecs).
-       \param keep_open Tells if the video writer associated to the specified filename
-       must be kept open or not (to allow frames to be added in the same file afterwards).
-    **/
-    const CImgList<T>& save_video(const char *const filename, const unsigned int fps=25,
-                                  const char *codec=0, const bool keep_open=false) const {
-#ifndef cimg_use_opencv
-      cimg::unused(codec,keep_open);
-      return save_ffmpeg_external(filename,fps);
-#else
-      static CvVideoWriter *writers[32] = { 0 };
-      static CImgList<charT> filenames(32);
-      static CImg<intT> sizes(32,2,1,1,0);
-      static int last_used_index = -1;
-
-      // Detect if a video writer already exists for the specified filename.
-      cimg::mutex(9);
-      int index = -1;
-      if (filename) {
-        if (last_used_index>=0 && !std::strcmp(filename,filenames[last_used_index])) {
-          index = last_used_index;
-        } else cimglist_for(filenames,l) if (filenames[l] && !std::strcmp(filename,filenames[l])) {
-            index = l; break;
-          }
-      } else index = last_used_index;
-      cimg::mutex(9,0);
-
-      // Find empty slot for capturing video stream.
-      if (index<0) {
-        if (!filename)
-          throw CImgArgumentException(_cimglist_instance
-                                      "save_video(): No already open video writer found. You must specify a "
-                                      "non-(null) filename argument for the first call.",
-                                      cimglist_instance);
-        else { cimg::mutex(9); cimglist_for(filenames,l) if (!filenames[l]) { index = l; break; } cimg::mutex(9,0); }
-        if (index<0)
-          throw CImgIOException(_cimglist_instance
-                                "save_video(): File '%s', no video writer slots available. "
-                                "You have to release some of your previously opened videos.",
-                                cimglist_instance,filename);
-        if (is_empty())
-          throw CImgInstanceException(_cimglist_instance
-                                      "save_video(): Instance list is empty.",
-                                      cimglist_instance);
-        const unsigned int W = _data?_data[0]._width:0, H = _data?_data[0]._height:0;
-        if (!W || !H)
-          throw CImgInstanceException(_cimglist_instance
-                                      "save_video(): Frame [0] is an empty image.",
-                                      cimglist_instance);
-
-#define _cimg_docase(x) ((x)>='a'&&(x)<='z'?(x) + 'A' - 'a':(x))
-        const char
-          *const _codec = codec && *codec?codec:"mp4v",
-          codec0 = _cimg_docase(_codec[0]),
-          codec1 = _codec[0]?_cimg_docase(_codec[1]):0,
-          codec2 = _codec[1]?_cimg_docase(_codec[2]):0,
-          codec3 = _codec[2]?_cimg_docase(_codec[3]):0;
-        cimg::mutex(9);
-        writers[index] = cvCreateVideoWriter(filename,CV_FOURCC(codec0,codec1,codec2,codec3),
-                                             fps,cvSize(W,H));
-        CImg<charT>::string(filename).move_to(filenames[index]);
-        sizes(index,0) = W; sizes(index,1) = H;
-        cimg::mutex(9,0);
-        if (!writers[index])
-          throw CImgIOException(_cimglist_instance
-                                "save_video(): File '%s', unable to initialize video writer with codec '%c%c%c%c'.",
-                                cimglist_instance,filename,
-                                codec0,codec1,codec2,codec3);
-      }
-
-      if (!is_empty()) {
-        const unsigned int W = sizes(index,0), H = sizes(index,1);
-        cimg::mutex(9);
-        IplImage *ipl = cvCreateImage(cvSize(W,H),8,3);
-        cimglist_for(*this,l) {
-          CImg<T> &src = _data[l];
-          if (src.is_empty())
-            cimg::warn(_cimglist_instance
-                       "save_video(): Skip empty frame %d for file '%s'.",
-                       cimglist_instance,l,filename);
-          if (src._depth>1 || src._spectrum>3)
-            cimg::warn(_cimglist_instance
-                       "save_video(): Frame %u has incompatible dimension (%u,%u,%u,%u). "
-                       "Some image data may be ignored when writing frame into video file '%s'.",
-                       cimglist_instance,l,src._width,src._height,src._depth,src._spectrum,filename);
-          if (src._width==W && src._height==H && src._spectrum==3) {
-            const T *ptr_r = src.data(0,0,0,0), *ptr_g = src.data(0,0,0,1), *ptr_b = src.data(0,0,0,2);
-            char *ptrd = ipl->imageData;
-            cimg_forXY(src,x,y) {
-              *(ptrd++) = (char)*(ptr_b++); *(ptrd++) = (char)*(ptr_g++); *(ptrd++) = (char)*(ptr_r++);
-            }
-          } else {
-            CImg<unsigned char> _src(src,false);
-            _src.channels(0,std::min(_src._spectrum - 1,2U)).resize(W,H);
-            _src.resize(W,H,1,3,_src._spectrum==1);
-            const unsigned char *ptr_r = _src.data(0,0,0,0), *ptr_g = _src.data(0,0,0,1), *ptr_b = _src.data(0,0,0,2);
-            char *ptrd = ipl->imageData;
-            cimg_forXY(_src,x,y) {
-              *(ptrd++) = (char)*(ptr_b++); *(ptrd++) = (char)*(ptr_g++); *(ptrd++) = (char)*(ptr_r++);
-            }
-          }
-          cvWriteFrame(writers[index],ipl);
-        }
-        cvReleaseImage(&ipl);
-        cimg::mutex(9,0);
-      }
-
-      cimg::mutex(9);
-      if (!keep_open) {
-        cvReleaseVideoWriter(&writers[index]);
-        writers[index] = 0;
-        filenames[index].assign();
-        sizes(index,0) = sizes(index,1) = 0;
-        last_used_index = -1;
-      } else last_used_index = index;
-      cimg::mutex(9,0);
-
-      return *this;
-#endif
-    }
-
-    //! Save image sequence, using the external tool 'ffmpeg'.
-    /**
-      \param filename Filename to write data to.
-      \param fps Number of frames per second.
-      \param codec Type of compression.
-      \param bitrate Output bitrate
-    **/
-    const CImgList<T>& save_ffmpeg_external(const char *const filename, const unsigned int fps=25,
-                                            const char *const codec=0, const unsigned int bitrate=2048) const {
-      if (!filename)
-        throw CImgArgumentException(_cimglist_instance
-                                    "save_ffmpeg_external(): Specified filename is (null).",
-                                    cimglist_instance);
-      if (is_empty()) { cimg::fempty(0,filename); return *this; }
-
-      const char
-        *const ext = cimg::split_filename(filename),
-        *const _codec = codec?codec:!cimg::strcasecmp(ext,"flv")?"flv":"mpeg2video";
-
-      CImg<charT> command(1024), filename_tmp(256), filename_tmp2(256);
-      CImgList<charT> filenames;
-      std::FILE *file = 0;
-      cimglist_for(*this,l) if (!_data[l].is_sameXYZ(_data[0]))
-        throw CImgInstanceException(_cimglist_instance
-                                    "save_ffmpeg_external(): Invalid instance dimensions for file '%s'.",
-                                    cimglist_instance,
-                                    filename);
-      do {
-        cimg_snprintf(filename_tmp,filename_tmp._width,"%s%c%s",
-                      cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_000001.ppm",filename_tmp._data);
-        if ((file=std_fopen(filename_tmp2,"rb"))!=0) cimg::fclose(file);
-      } while (file);
-      cimglist_for(*this,l) {
-        cimg_snprintf(filename_tmp2,filename_tmp2._width,"%s_%.6u.ppm",filename_tmp._data,l + 1);
-        CImg<charT>::string(filename_tmp2).move_to(filenames);
-        if (_data[l]._depth>1 || _data[l]._spectrum!=3) _data[l].get_resize(-100,-100,1,3).save_pnm(filename_tmp2);
-        else _data[l].save_pnm(filename_tmp2);
-      }
-#if cimg_OS!=2
-      cimg_snprintf(command,command._width,"%s -i \"%s_%%6d.ppm\" -vcodec %s -b %uk -r %u -y \"%s\" >/dev/null 2>&1",
-                    cimg::ffmpeg_path(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    _codec,bitrate,fps,
-                    CImg<charT>::string(filename)._system_strescape().data());
-#else
-      cimg_snprintf(command,command._width,"\"%s -i \"%s_%%6d.ppm\" -vcodec %s -b %uk -r %u -y \"%s\"\" >NUL 2>&1",
-                    cimg::ffmpeg_path(),
-                    CImg<charT>::string(filename_tmp)._system_strescape().data(),
-                    _codec,bitrate,fps,
-                    CImg<charT>::string(filename)._system_strescape().data());
-#endif
-      cimg::system(command);
-      file = std_fopen(filename,"rb");
-      if (!file)
-        throw CImgIOException(_cimglist_instance
-                              "save_ffmpeg_external(): Failed to save file '%s' with external command 'ffmpeg'.",
-                              cimglist_instance,
-                              filename);
-      else cimg::fclose(file);
-      cimglist_for(*this,l) std::remove(filenames[l]);
-      return *this;
-    }
-
-    //! Serialize a CImgList<T> instance into a raw CImg<unsigned char> buffer.
-    /**
-       \param is_compressed tells if zlib compression must be used for serialization
-       (this requires 'cimg_use_zlib' been enabled).
-    **/
-    CImg<ucharT> get_serialize(const bool is_compressed=false) const {
-#ifndef cimg_use_zlib
-      if (is_compressed)
-        cimg::warn(_cimglist_instance
-                   "get_serialize(): Unable to compress data unless zlib is enabled, "
-                   "storing them uncompressed.",
-                   cimglist_instance);
-#endif
-      CImgList<ucharT> stream;
-      CImg<charT> tmpstr(128);
-      const char *const ptype = pixel_type(), *const etype = cimg::endianness()?"big":"little";
-      if (std::strstr(ptype,"unsigned")==ptype)
-        cimg_snprintf(tmpstr,tmpstr._width,"%u unsigned_%s %s_endian\n",_width,ptype + 9,etype);
-      else
-        cimg_snprintf(tmpstr,tmpstr._width,"%u %s %s_endian\n",_width,ptype,etype);
-      CImg<ucharT>::string(tmpstr,false).move_to(stream);
-      cimglist_for(*this,l) {
-        const CImg<T>& img = _data[l];
-        cimg_snprintf(tmpstr,tmpstr._width,"%u %u %u %u",img._width,img._height,img._depth,img._spectrum);
-        CImg<ucharT>::string(tmpstr,false).move_to(stream);
-        if (img._data) {
-          CImg<T> tmp;
-          if (cimg::endianness()) { tmp = img; cimg::invert_endianness(tmp._data,tmp.size()); }
-          const CImg<T>& ref = cimg::endianness()?tmp:img;
-          bool failed_to_compress = true;
-          if (is_compressed) {
-#ifdef cimg_use_zlib
-            const ulongT siz = sizeof(T)*ref.size();
-            uLongf csiz = (ulongT)compressBound(siz);
-            Bytef *const cbuf = new Bytef[csiz];
-            if (compress(cbuf,&csiz,(Bytef*)ref._data,siz))
-              cimg::warn(_cimglist_instance
-                         "get_serialize(): Failed to save compressed data, saving them uncompressed.",
-                         cimglist_instance);
-            else {
-              cimg_snprintf(tmpstr,tmpstr._width," #%lu\n",csiz);
-              CImg<ucharT>::string(tmpstr,false).move_to(stream);
-              CImg<ucharT>(cbuf,csiz).move_to(stream);
-              delete[] cbuf;
-              failed_to_compress = false;
-            }
-#endif
-          }
-          if (failed_to_compress) { // Write in a non-compressed way.
-            CImg<charT>::string("\n",false).move_to(stream);
-            stream.insert(1);
-            stream.back().assign((unsigned char*)ref._data,ref.size()*sizeof(T),1,1,1,true);
-          }
-        } else CImg<charT>::string("\n",false).move_to(stream);
-      }
-      cimglist_apply(stream,unroll)('y');
-      return stream>'y';
-    }
-
-    //! Unserialize a CImg<unsigned char> serialized buffer into a CImgList<T> list.
-    template<typename t>
-    static CImgList<T> get_unserialize(const CImg<t>& buffer) {
-#ifdef cimg_use_zlib
-#define _cimgz_unserialize_case(Tss) { \
-        Bytef *cbuf = (Bytef*)stream; \
-        if (sizeof(t)!=1 || cimg::type<t>::string()==cimg::type<bool>::string()) { \
-          cbuf = new Bytef[csiz]; Bytef *_cbuf = cbuf; \
-          for (ulongT i = 0; i<csiz; ++i) *(_cbuf++) = (Bytef)*(stream++); \
-          is_bytef = false; \
-        } else { stream+=csiz; is_bytef = true; } \
-        CImg<Tss> raw(W,H,D,C); \
-        uLongf destlen = raw.size()*sizeof(Tss); \
-        uncompress((Bytef*)raw._data,&destlen,cbuf,csiz); \
-        if (!is_bytef) delete[] cbuf; \
-        if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw.size()); \
-        raw.move_to(img); \
-      }
-#else
-#define _cimgz_unserialize_case(Tss) \
-      throw CImgArgumentException("CImgList<%s>::get_unserialize(): Unable to unserialize compressed data " \
-                                  "unless zlib is enabled.", \
-                                  pixel_type());
-#endif
-
-#define _cimg_unserialize_case(Ts,Tss) \
-      if (!loaded && !cimg::strcasecmp(Ts,str_pixeltype)) { \
-        for (unsigned int l = 0; l<N; ++l) { \
-          j = 0; while ((i=(int)*stream)!='\n' && stream<estream && j<255) { ++stream; tmp[j++] = (char)i; } \
-          ++stream; tmp[j] = 0; \
-          W = H = D = C = 0; csiz = 0; \
-          if ((err = cimg_sscanf(tmp,"%u %u %u %u #" cimg_fuint64,&W,&H,&D,&C,&csiz))<4) \
-            throw CImgArgumentException("CImgList<%s>::unserialize(): Invalid specified size (%u,%u,%u,%u) for " \
-                                        "image #%u in serialized buffer.", \
-                                        pixel_type(),W,H,D,C,l); \
-          if (W*H*D*C>0) { \
-            CImg<T> &img = res._data[l]; \
-            if (err==5) _cimgz_unserialize_case(Tss) \
-            else { \
-              if (sizeof(t)!=1) { \
-                CImg<ucharT> raw(W*sizeof(Tss),H,D,C);  \
-                cimg_for(raw,p,unsigned char) *p = (unsigned char)*(stream++); \
-                img.assign((Tss*)raw._data,W,H,D,C); \
-              } else img.assign((Tss*)stream,W,H,D,C); \
-              if (endian!=cimg::endianness()) cimg::invert_endianness(img._data,img.size()); \
-            } \
-          } \
-        } \
-        loaded = true; \
-      }
-
-      if (buffer.is_empty())
-        throw CImgArgumentException("CImgList<%s>::get_unserialize(): Specified serialized buffer is (null).",
-                                    pixel_type());
-      CImgList<T> res;
-      const t *stream = buffer._data, *const estream = buffer._data + buffer.size();
-      bool loaded = false, endian = cimg::endianness(), is_bytef = false;
-      CImg<charT> tmp(256), str_pixeltype(256), str_endian(256);
-      *tmp = *str_pixeltype = *str_endian = 0;
-      unsigned int j, N = 0, W, H, D, C;
-      uint64T csiz;
-      int i, err;
-      cimg::unused(is_bytef);
-      do {
-        j = 0; while ((i=(int)*stream)!='\n' && stream<estream && j<255) { ++stream; tmp[j++] = (char)i; }
-        ++stream; tmp[j] = 0;
-      } while (*tmp=='#' && stream<estream);
-      err = cimg_sscanf(tmp,"%u%*c%255[A-Za-z64_]%*c%255[sA-Za-z_ ]",
-                        &N,str_pixeltype._data,str_endian._data);
-      if (err<2)
-        throw CImgArgumentException("CImgList<%s>::get_unserialize(): CImg header not found in serialized buffer.",
-                                    pixel_type());
-      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
-      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
-      res.assign(N);
-      _cimg_unserialize_case("bool",bool);
-      _cimg_unserialize_case("unsigned_char",unsigned char);
-      _cimg_unserialize_case("uchar",unsigned char);
-      _cimg_unserialize_case("char",char);
-      _cimg_unserialize_case("unsigned_short",unsigned short);
-      _cimg_unserialize_case("ushort",unsigned short);
-      _cimg_unserialize_case("short",short);
-      _cimg_unserialize_case("unsigned_int",unsigned int);
-      _cimg_unserialize_case("uint",unsigned int);
-      _cimg_unserialize_case("int",int);
-      _cimg_unserialize_case("unsigned_int64",uint64T);
-      _cimg_unserialize_case("uint64",uint64T);
-      _cimg_unserialize_case("int64",int64T);
-      _cimg_unserialize_case("float",float);
-      _cimg_unserialize_case("double",double);
-      if (!loaded)
-        throw CImgArgumentException("CImgList<%s>::get_unserialize(): Unsupported pixel type '%s' defined "
-                                    "in serialized buffer.",
-                                    pixel_type(),str_pixeltype._data);
-      return res;
-    }
-
-    //@}
-    //----------------------------------
-    //
-    //! \name Others
-    //@{
-    //----------------------------------
-
-    //! Crop font along the X-axis.
-    /**
-    **/
-    CImgList<T>& crop_font() {
-      return get_crop_font().move_to(*this);
-    }
-
-    //! Crop font along the X-axis \newinstance.
-    /**
-    **/
-    CImgList<T> get_crop_font() const {
-      CImgList<T> res;
-      cimglist_for(*this,l) {
-        const CImg<T>& letter = (*this)[l];
-        int xmin = letter.width(), xmax = 0;
-        cimg_forXY(letter,x,y) if (letter(x,y)) { if (x<xmin) xmin = x; if (x>xmax) xmax = x; }
-        if (xmin>xmax) CImg<T>(letter._width,letter._height,1,letter._spectrum,0).move_to(res);
-        else letter.get_crop(xmin,0,xmax,letter._height - 1).move_to(res);
-      }
-      res[' '].resize(res['f']._width,-100,-100,-100,0);
-      if (' ' + 256<res.size()) res[' ' + 256].resize(res['f']._width,-100,-100,-100,0);
-      return res;
-    }
-
-    //! Return a CImg pre-defined font with desired size.
-    /**
-       \param font_height Height of the desired font (exact match for 13,23,53,103).
-       \param is_variable_width Decide if the font has a variable (\c true) or fixed (\c false) width.
-    **/
-    static const CImgList<ucharT>& font(const unsigned int font_height, const bool is_variable_width=true) {
-      if (!font_height) return CImgList<ucharT>::const_empty();
-      cimg::mutex(11);
-
-      // Decompress nearest base font data if needed.
-      static const char *data_fonts[] = { cimg::data_font12x13, cimg::data_font20x23, cimg::data_font47x53, 0 };
-      static const unsigned int data_widths[] = { 12,20,47,90 }, data_heights[] = { 13,23,53,103 },
-                                data_Ms[] = { 86,79,57,47 };
-      const unsigned int data_ind = font_height<=13U?0U:font_height<=23U?1U:font_height<=53U?2U:3U;
-      static CImg<ucharT> base_fonts[4];
-      CImg<ucharT> &base_font = base_fonts[data_ind];
-      if (!base_font) {
-        const unsigned int w = data_widths[data_ind], h = data_heights[data_ind], M = data_Ms[data_ind];
-        base_font.assign(256*w,h);
-        const char *data_font = data_fonts[data_ind];
-        unsigned char *ptrd = base_font;
-        const unsigned char *const ptrde = base_font.end();
-
-        // Special case needed for 90x103 to avoid MS compiler limit with big strings.
-        CImg<char> data90x103;
-        if (!data_font) {
-          ((CImg<char>(cimg::_data_font90x103[0],
-                       (unsigned int)std::strlen(cimg::_data_font90x103[0]),1,1,1,true),
-            CImg<char>(cimg::_data_font90x103[1],
-                       (unsigned int)std::strlen(cimg::_data_font90x103[1]) + 1,1,1,1,true))>'x').
-            move_to(data90x103);
-          data_font = data90x103.data();
-        }
-
-        // Uncompress font data (decode RLE).
-        for (const char *ptrs = data_font; *ptrs; ++ptrs) {
-          const int c = (int)(*ptrs - M - 32), v = c>=0?255:0, n = c>=0?c:-c;
-          if (ptrd + n<=ptrde) { std::memset(ptrd,v,n); ptrd+=n; }
-          else { std::memset(ptrd,v,ptrde - ptrd); break; }
-        }
-      }
-
-      // Find optimal font cache location to return.
-      static CImgList<ucharT> fonts[16];
-      static bool is_variable_widths[16] = { 0 };
-      unsigned int ind = ~0U;
-      for (int i = 0; i<16; ++i)
-        if (!fonts[i] || (is_variable_widths[i]==is_variable_width && font_height==fonts[i][0]._height)) {
-          ind = (unsigned int)i; break; // Found empty slot or cached font.
-        }
-      if (ind==~0U) { // No empty slots nor existing font in cache.
-        fonts->assign();
-        std::memmove(fonts,fonts + 1,15*sizeof(CImgList<ucharT>));
-        std::memmove(is_variable_widths,is_variable_widths + 1,15*sizeof(bool));
-        std::memset(fonts + (ind=15),0,sizeof(CImgList<ucharT>)); // Free a slot in cache for new font.
-      }
-      CImgList<ucharT> &font = fonts[ind];
-
-      // Render requested font.
-      if (!font) {
-        const unsigned int padding_x = font_height<33U?1U:font_height<53U?2U:font_height<103U?3U:4U;
-        is_variable_widths[ind] = is_variable_width;
-        font = base_font.get_split('x',256);
-        if (font_height!=font[0]._height)
-          cimglist_for(font,l)
-            font[l].resize(std::max(1U,font[l]._width*font_height/font[l]._height),font_height,-100,-100,
-                           font[0]._height>font_height?2:5);
-        if (is_variable_width) font.crop_font();
-        cimglist_for(font,l) font[l].resize(font[l]._width + padding_x,-100,1,1,0,0,0.5);
-        font.insert(256,0);
-        cimglist_for_in(font,0,255,l) font[l].assign(font[l + 256]._width,font[l + 256]._height,1,3,1);
-      }
-      cimg::mutex(11,0);
-      return font;
-    }
-
-    //! Compute a 1d Fast Fourier Transform, along specified axis.
-    /**
-       \param axis Axis along which the Fourier transform is computed.
-       \param invert Tells if the direct (\c false) or inverse transform (\c true) is computed.
-    **/
-    CImgList<T>& FFT(const char axis, const bool invert=false) {
-      if (is_empty()) return *this;
-      if (_width==1) insert(1);
-      if (_width>2)
-        cimg::warn(_cimglist_instance
-                   "FFT(): Instance has more than 2 images",
-                   cimglist_instance);
-
-      CImg<T>::FFT(_data[0],_data[1],axis,invert);
-      return *this;
-    }
-
-    //! Compute a 1-D Fast Fourier Transform, along specified axis \newinstance.
-    CImgList<Tfloat> get_FFT(const char axis, const bool invert=false) const {
-      return CImgList<Tfloat>(*this,false).FFT(axis,invert);
-    }
-
-    //! Compute a n-d Fast Fourier Transform.
-    /**
-      \param invert Tells if the direct (\c false) or inverse transform (\c true) is computed.
-    **/
-    CImgList<T>& FFT(const bool invert=false) {
-      if (is_empty()) return *this;
-      if (_width==1) insert(1);
-      if (_width>2)
-        cimg::warn(_cimglist_instance
-                   "FFT(): Instance has more than 2 images",
-                   cimglist_instance);
-
-      CImg<T>::FFT(_data[0],_data[1],invert);
-      return *this;
-    }
-
-    //! Compute a n-d Fast Fourier Transform \newinstance.
-    CImgList<Tfloat> get_FFT(const bool invert=false) const {
-      return CImgList<Tfloat>(*this,false).FFT(invert);
-    }
-
-    //! Reverse primitives orientations of a 3d object.
-    /**
-    **/
-    CImgList<T>& reverse_object3d() {
-      cimglist_for(*this,l) {
-        CImg<T>& p = _data[l];
-        switch (p.size()) {
-        case 2 : case 3: cimg::swap(p[0],p[1]); break;
-        case 6 : cimg::swap(p[0],p[1],p[2],p[4],p[3],p[5]); break;
-        case 9 : cimg::swap(p[0],p[1],p[3],p[5],p[4],p[6]); break;
-        case 4 : cimg::swap(p[0],p[1],p[2],p[3]); break;
-        case 12 : cimg::swap(p[0],p[1],p[2],p[3],p[4],p[6],p[5],p[7],p[8],p[10],p[9],p[11]); break;
-        }
-      }
-      return *this;
-    }
-
-    //! Reverse primitives orientations of a 3d object \newinstance.
-    CImgList<T> get_reverse_object3d() const {
-      return (+*this).reverse_object3d();
-    }
-
-    //@}
-  }; // struct CImgList<T> { ...
-
-  /*
-    #---------------------------------------------
-    #
-    # Completion of previously declared functions
-    #
-    #----------------------------------------------
-  */
-
-namespace cimg {
-
-  // Functions to return standard streams 'stdin', 'stdout' and 'stderr'.
-  // (throw a CImgIOException when macro 'cimg_use_r' is defined).
-  inline FILE* _stdin(const bool throw_exception) {
-#ifndef cimg_use_r
-    cimg::unused(throw_exception);
-    return stdin;
-#else
-    if (throw_exception) {
-      cimg::exception_mode(0);
-      throw CImgIOException("cimg::stdin(): Reference to 'stdin' stream not allowed in R mode "
-                            "('cimg_use_r' is defined).");
-    }
-    return 0;
-#endif
-  }
-
-  inline FILE* _stdout(const bool throw_exception) {
-#ifndef cimg_use_r
-    cimg::unused(throw_exception);
-    return stdout;
-#else
-    if (throw_exception) {
-      cimg::exception_mode(0);
-      throw CImgIOException("cimg::stdout(): Reference to 'stdout' stream not allowed in R mode "
-                            "('cimg_use_r' is defined).");
-    }
-    return 0;
-#endif
-  }
-
-  inline FILE* _stderr(const bool throw_exception) {
-#ifndef cimg_use_r
-    cimg::unused(throw_exception);
-    return stderr;
-#else
-    if (throw_exception) {
-      cimg::exception_mode(0);
-      throw CImgIOException("cimg::stderr(): Reference to 'stderr' stream not allowed in R mode "
-                            "('cimg_use_r' is defined).");
-    }
-    return 0;
-#endif
-  }
-
-  // Open a file (with wide character support on Windows).
-  inline std::FILE *win_fopen(const char *const path, const char *const mode) {
-#if cimg_OS==2
-    // Convert 'path' to a wide-character string.
-    int err = MultiByteToWideChar(CP_UTF8,0,path,-1,0,0);
-    if (!err) return std_fopen(path,mode);
-    CImg<wchar_t> wpath(err);
-    err = MultiByteToWideChar(CP_UTF8,0,path,-1,wpath,err);
-    if (!err) return std_fopen(path,mode);
-
-    // Convert 'mode' to a wide-character string.
-    err = MultiByteToWideChar(CP_UTF8,0,mode,-1,0,0);
-    if (!err) return std_fopen(path,mode);
-    CImg<wchar_t> wmode(err);
-    err = MultiByteToWideChar(CP_UTF8,0,mode,-1,wmode,err);
-    if (!err) return std_fopen(path,mode);
-
-    return _wfopen(wpath,wmode);
-#else
-    return std_fopen(path,mode);
-#endif
-  }
-
-  //! Get/set path to store temporary files.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path where temporary files can be saved.
-  **/
-  inline const char* temporary_path(const char *const user_path, const bool reinit_path) {
-#define _cimg_test_temporary_path(p)                                    \
-    if (!path_found) {                                                  \
-      cimg_snprintf(s_path,s_path.width(),"%s",p);                      \
-      cimg_snprintf(tmp,tmp._width,"%s%c%s",s_path.data(),cimg_file_separator,filename_tmp._data); \
-      if ((file=std_fopen(tmp,"wb"))!=0) { cimg::fclose(file); std::remove(tmp); path_found = true; } \
-    }
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      CImg<char> tmp(1024), filename_tmp(256);
-      std::FILE *file = 0;
-      cimg_snprintf(filename_tmp,filename_tmp._width,"%s.tmp",cimg::filenamerand());
-      char *tmpPath = std::getenv("TMP");
-      if (!tmpPath) { tmpPath = std::getenv("TEMP"); winformat_string(tmpPath); }
-      if (tmpPath) _cimg_test_temporary_path(tmpPath);
-#if cimg_OS==2
-      _cimg_test_temporary_path("C:\\WINNT\\Temp");
-      _cimg_test_temporary_path("C:\\WINDOWS\\Temp");
-      _cimg_test_temporary_path("C:\\Temp");
-      _cimg_test_temporary_path("C:");
-      _cimg_test_temporary_path("D:\\WINNT\\Temp");
-      _cimg_test_temporary_path("D:\\WINDOWS\\Temp");
-      _cimg_test_temporary_path("D:\\Temp");
-      _cimg_test_temporary_path("D:");
-#else
-      _cimg_test_temporary_path("/tmp");
-      _cimg_test_temporary_path("/var/tmp");
-#endif
-      if (!path_found) {
-        *s_path = 0;
-        std::strncpy(tmp,filename_tmp,tmp._width - 1);
-        if ((file=std_fopen(tmp,"wb"))!=0) { cimg::fclose(file); std::remove(tmp); path_found = true; }
-      }
-      if (!path_found) {
-        cimg::mutex(7,0);
-        throw CImgIOException("cimg::temporary_path(): Failed to locate path for writing temporary files.\n");
-      }
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the <i>Program Files/</i> directory (Windows only).
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the program files.
-  **/
-#if cimg_OS==2
-  inline const char* programfiles_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(MAX_PATH);
-      *s_path = 0;
-      // Note: in the following line, 0x26 = CSIDL_PROGRAM_FILES (not defined on every compiler).
-#if !defined(__INTEL_COMPILER)
-      if (!SHGetSpecialFolderPathA(0,s_path,0x0026,false)) {
-        const char *const pfPath = std::getenv("PROGRAMFILES");
-        if (pfPath) std::strncpy(s_path,pfPath,MAX_PATH - 1);
-        else std::strcpy(s_path,"C:\\PROGRA~1");
-      }
-#else
-      std::strcpy(s_path,"C:\\PROGRA~1");
-#endif
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-#endif
-
-  //! Get/set path to the ImageMagick's \c convert binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c convert binary.
-  **/
-  inline const char* imagemagick_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      const char *const pf_path = programfiles_path();
-      if (!path_found) {
-        std::strcpy(s_path,".\\convert.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%.2d-\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%d-Q\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%d\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%.2d-\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%d-Q\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%d\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%.2d-\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%d-Q\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%d\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"convert.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./convert");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"convert");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the GraphicsMagick's \c gm binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c gm binary.
-  **/
-  inline const char* graphicsmagick_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      const char *const pf_path = programfiles_path();
-      if (!path_found) {
-        std::strcpy(s_path,".\\gm.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%.2d-\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%d-Q\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%d\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"%s\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",pf_path,k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%.2d-\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%d-Q\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%d\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"C:\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%.2d-\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%d-Q\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%d\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=10 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 9; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      for (int k = 32; k>=0 && !path_found; --k) {
-        cimg_snprintf(s_path,s_path._width,"D:\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",k);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gm.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./gm");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gm");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the XMedcon's \c medcon binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c medcon binary.
-  **/
-  inline const char* medcon_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      const char *const pf_path = programfiles_path();
-      if (!path_found) {
-        std::strcpy(s_path,".\\medcon.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) {
-        cimg_snprintf(s_path,s_path._width,"%s\\XMedCon\\bin\\medcon.bat",pf_path);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) {
-        cimg_snprintf(s_path,s_path._width,"%s\\XMedCon\\bin\\medcon.exe",pf_path);
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) {
-        std::strcpy(s_path,"C:\\XMedCon\\bin\\medcon.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"medcon.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./medcon");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"medcon");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the FFMPEG's \c ffmpeg binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c ffmpeg binary.
-  **/
-  inline const char *ffmpeg_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\ffmpeg.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"ffmpeg.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./ffmpeg");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"ffmpeg");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the \c gzip binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c gzip binary.
-  **/
-  inline const char *gzip_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\gzip.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gzip.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./gzip");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gzip");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the \c gunzip binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c gunzip binary.
-  **/
-  inline const char *gunzip_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\gunzip.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gunzip.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./gunzip");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"gunzip");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the \c dcraw binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c dcraw binary.
-  **/
-  inline const char *dcraw_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\dcraw.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"dcraw.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./dcraw");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"dcraw");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the \c wget binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c wget binary.
-  **/
-  inline const char *wget_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\wget.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"wget.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./wget");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"wget");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  //! Get/set path to the \c curl binary.
-  /**
-     \param user_path Specified path, or \c 0 to get the path currently used.
-     \param reinit_path Force path to be recalculated (may take some time).
-     \return Path containing the \c curl binary.
-  **/
-  inline const char *curl_path(const char *const user_path, const bool reinit_path) {
-    static CImg<char> s_path;
-    cimg::mutex(7);
-    if (reinit_path) s_path.assign();
-    if (user_path) {
-      if (!s_path) s_path.assign(1024);
-      std::strncpy(s_path,user_path,1023);
-    } else if (!s_path) {
-      s_path.assign(1024);
-      bool path_found = false;
-      std::FILE *file = 0;
-#if cimg_OS==2
-      if (!path_found) {
-        std::strcpy(s_path,".\\curl.exe");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"curl.exe");
-#else
-      if (!path_found) {
-        std::strcpy(s_path,"./curl");
-        if ((file=std_fopen(s_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
-      }
-      if (!path_found) std::strcpy(s_path,"curl");
-#endif
-      winformat_string(s_path);
-    }
-    cimg::mutex(7,0);
-    return s_path;
-  }
-
-  // [internal] Sorting function, used by cimg::files().
-  inline int _sort_files(const void* a, const void* b) {
-    const CImg<char> &sa = *(CImg<char>*)a, &sb = *(CImg<char>*)b;
-    return std::strcmp(sa._data,sb._data);
-  }
-
-  //! Return list of files/directories in specified directory.
-  /**
-     \param path Path to the directory. Set to 0 for current directory.
-     \param is_pattern Tell if specified path has a matching pattern in it.
-     \param mode Output type, can be primary { 0=files only | 1=folders only | 2=files + folders }.
-     \param include_path Tell if \c path must be included in resulting filenames.
-     \return A list of filenames.
-  **/
-  inline CImgList<char> files(const char *const path, const bool is_pattern=false,
-                              const unsigned int mode=2, const bool include_path=false) {
-    if (!path || !*path) return files("*",true,mode,include_path);
-    CImgList<char> res;
-
-    // If path is a valid folder name, ignore argument 'is_pattern'.
-    const bool _is_pattern = is_pattern && !cimg::is_directory(path);
-    bool is_root = false, is_current = false;
-    cimg::unused(is_root,is_current);
-
-    // Clean format of input path.
-    CImg<char> pattern, _path = CImg<char>::string(path);
-#if cimg_OS==2
-    for (char *ps = _path; *ps; ++ps) if (*ps=='\\') *ps='/';
-#endif
-    char *pd = _path;
-    for (char *ps = pd; *ps; ++ps) { if (*ps!='/' || *ps!=*(ps+1)) *(pd++) = *ps; }
-    *pd = 0;
-    unsigned int lp = (unsigned int)std::strlen(_path);
-    if (!_is_pattern && lp && _path[lp - 1]=='/') {
-      _path[lp - 1] = 0; --lp;
-#if cimg_OS!=2
-      is_root = !*_path;
-#endif
-    }
-
-    // Separate folder path and matching pattern.
-    if (_is_pattern) {
-      const unsigned int bpos = (unsigned int)(cimg::basename(_path,'/') - _path.data());
-      CImg<char>::string(_path).move_to(pattern);
-      if (bpos) {
-        _path[bpos - 1] = 0; // End 'path' at last slash.
-#if cimg_OS!=2
-        is_root = !*_path;
-#endif
-      } else { // No path to folder specified, assuming current folder.
-        is_current = true; *_path = 0;
-      }
-      lp = (unsigned int)std::strlen(_path);
-    }
-
-    // Windows version.
-#if cimg_OS==2
-    if (!_is_pattern) {
-      pattern.assign(lp + 3);
-      std::memcpy(pattern,_path,lp);
-      pattern[lp] = '/'; pattern[lp + 1] = '*'; pattern[lp + 2] = 0;
-    }
-    WIN32_FIND_DATAA file_data;
-    const HANDLE dir = FindFirstFileA(pattern.data(),&file_data);
-    if (dir==INVALID_HANDLE_VALUE) return CImgList<char>::const_empty();
-    do {
-      const char *const filename = file_data.cFileName;
-      if (*filename!='.' || (filename[1] && (filename[1]!='.' || filename[2]))) {
-        const unsigned int lf = (unsigned int)std::strlen(filename);
-        const bool is_directory = (file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)!=0;
-        if ((!mode && !is_directory) || (mode==1 && is_directory) || mode>=2) {
-          if (include_path) {
-            CImg<char> full_filename((lp?lp+1:0) + lf + 1);
-            if (lp) { std::memcpy(full_filename,_path,lp); full_filename[lp] = '/'; }
-            std::memcpy(full_filename._data + (lp?lp + 1:0),filename,lf + 1);
-            full_filename.move_to(res);
-          } else CImg<char>(filename,lf + 1).move_to(res);
-        }
-      }
-    } while (FindNextFileA(dir,&file_data));
-    FindClose(dir);
-
-    // Unix version (posix).
-#elif cimg_OS == 1
-    DIR *const dir = opendir(is_root?"/":is_current?".":_path.data());
-    if (!dir) return CImgList<char>::const_empty();
-    struct dirent *ent;
-    while ((ent=readdir(dir))!=0) {
-      const char *const filename = ent->d_name;
-      if (*filename!='.' || (filename[1] && (filename[1]!='.' || filename[2]))) {
-        const unsigned int lf = (unsigned int)std::strlen(filename);
-        CImg<char> full_filename(lp + lf + 2);
-
-        if (!is_current) {
-          full_filename.assign(lp + lf + 2);
-          if (lp) std::memcpy(full_filename,_path,lp);
-          full_filename[lp] = '/';
-          std::memcpy(full_filename._data + lp + 1,filename,lf + 1);
-        } else full_filename.assign(filename,lf + 1);
-
-        struct stat st;
-        if (stat(full_filename,&st)==-1) continue;
-        const bool is_directory = (st.st_mode & S_IFDIR)!=0;
-        if ((!mode && !is_directory) || (mode==1 && is_directory) || mode==2) {
-          if (include_path) {
-            if (!_is_pattern || (_is_pattern && !fnmatch(pattern,full_filename,0)))
-              full_filename.move_to(res);
-          } else {
-            if (!_is_pattern || (_is_pattern && !fnmatch(pattern,full_filename,0)))
-              CImg<char>(filename,lf + 1).move_to(res);
-          }
-        }
-      }
-    }
-    closedir(dir);
-#endif
-
-    // Sort resulting list by lexicographic order.
-    if (res._width>=2) std::qsort(res._data,res._width,sizeof(CImg<char>),_sort_files);
-
-    return res;
-  }
-
-  //! Try to guess format from an image file.
-  /**
-     \param file Input file (can be \c 0 if \c filename is set).
-     \param filename Filename, as a C-string (can be \c 0 if \c file is set).
-     \return C-string containing the guessed file format, or \c 0 if nothing has been guessed.
-  **/
-  inline const char *ftype(std::FILE *const file, const char *const filename) {
-    if (!file && !filename)
-      throw CImgArgumentException("cimg::ftype(): Specified filename is (null).");
-    static const char
-      *const _pnm = "pnm",
-      *const _pfm = "pfm",
-      *const _bmp = "bmp",
-      *const _gif = "gif",
-      *const _jpg = "jpg",
-      *const _off = "off",
-      *const _pan = "pan",
-      *const _png = "png",
-      *const _tif = "tif",
-      *const _inr = "inr",
-      *const _dcm = "dcm";
-    const char *f_type = 0;
-    CImg<char> header;
-    const unsigned int omode = cimg::exception_mode();
-    cimg::exception_mode(0);
-    try {
-      header._load_raw(file,filename,512,1,1,1,false,false,0);
-      const unsigned char *const uheader = (unsigned char*)header._data;
-      if (!std::strncmp(header,"OFF\n",4)) f_type = _off; // OFF.
-      else if (!std::strncmp(header,"#INRIMAGE",9)) f_type = _inr; // INRIMAGE.
-      else if (!std::strncmp(header,"PANDORE",7)) f_type = _pan; // PANDORE.
-      else if (!std::strncmp(header.data() + 128,"DICM",4)) f_type = _dcm; // DICOM.
-      else if (uheader[0]==0xFF && uheader[1]==0xD8 && uheader[2]==0xFF) f_type = _jpg;  // JPEG.
-      else if (header[0]=='B' && header[1]=='M') f_type = _bmp;  // BMP.
-      else if (header[0]=='G' && header[1]=='I' && header[2]=='F' && header[3]=='8' && header[5]=='a' && // GIF.
-               (header[4]=='7' || header[4]=='9')) f_type = _gif;
-      else if (uheader[0]==0x89 && uheader[1]==0x50 && uheader[2]==0x4E && uheader[3]==0x47 &&  // PNG.
-               uheader[4]==0x0D && uheader[5]==0x0A && uheader[6]==0x1A && uheader[7]==0x0A) f_type = _png;
-      else if ((uheader[0]==0x49 && uheader[1]==0x49) || (uheader[0]==0x4D && uheader[1]==0x4D)) f_type = _tif; // TIFF.
-      else { // PNM or PFM.
-        CImgList<char> _header = header.get_split(CImg<char>::vector('\n'),0,false);
-        cimglist_for(_header,l) {
-          if (_header(l,0)=='#') continue;
-          if (_header[l]._height==2 && _header(l,0)=='P') {
-            const char c = _header(l,1);
-            if (c=='f' || c=='F') { f_type = _pfm; break; }
-            if (c>='1' && c<='9') { f_type = _pnm; break; }
-          }
-          f_type = 0; break;
-        }
-      }
-    } catch (CImgIOException&) { }
-    cimg::exception_mode(omode);
-    return f_type;
-  }
-
-  //! Load file from network as a local temporary file.
-  /**
-     \param filename Filename, as a C-string.
-     \param[out] filename_local C-string containing the path to a local copy of \c filename.
-     \param timeout Maximum time (in seconds) authorized for downloading the file from the URL.
-     \param try_fallback When using libcurl, tells using system calls as fallbacks in case of libcurl failure.
-     \return Value of \c filename_local.
-     \note Use the \c libcurl library, or the external binaries \c wget or \c curl to perform the download.
-  **/
-  inline char *load_network(const char *const url, char *const filename_local,
-                            const unsigned int timeout, const bool try_fallback,
-                            const char *const referer) {
-    if (!url)
-      throw CImgArgumentException("cimg::load_network(): Specified URL is (null).");
-    if (!filename_local)
-      throw CImgArgumentException("cimg::load_network(): Specified destination string is (null).");
-
-    const char *const __ext = cimg::split_filename(url), *const _ext = (*__ext && __ext>url)?__ext - 1:__ext;
-    CImg<char> ext = CImg<char>::string(_ext);
-    std::FILE *file = 0;
-    *filename_local = 0;
-    if (ext._width>16 || !cimg::strncasecmp(ext,"cgi",3)) *ext = 0;
-    else cimg::strwindows_reserved(ext);
-    do {
-      cimg_snprintf(filename_local,256,"%s%c%s%s",
-                    cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext._data);
-      if ((file=std_fopen(filename_local,"rb"))!=0) cimg::fclose(file);
-    } while (file);
-
-#ifdef cimg_use_curl
-    const unsigned int omode = cimg::exception_mode();
-    cimg::exception_mode(0);
-    try {
-      CURL *curl = 0;
-      CURLcode res;
-      curl = curl_easy_init();
-      if (curl) {
-        file = cimg::fopen(filename_local,"wb");
-        curl_easy_setopt(curl,CURLOPT_URL,url);
-        curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,0);
-        curl_easy_setopt(curl,CURLOPT_WRITEDATA,file);
-        curl_easy_setopt(curl,CURLOPT_SSL_VERIFYPEER,0L);
-        curl_easy_setopt(curl,CURLOPT_SSL_VERIFYHOST,0L);
-        curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION,1L);
-        if (timeout) curl_easy_setopt(curl,CURLOPT_TIMEOUT,(long)timeout);
-        if (std::strchr(url,'?')) curl_easy_setopt(curl,CURLOPT_HTTPGET,1L);
-        if (referer) curl_easy_setopt(curl,CURLOPT_REFERER,referer);
-        res = curl_easy_perform(curl);
-        curl_easy_cleanup(curl);
-        cimg::fseek(file,0,SEEK_END); // Check if file size is 0.
-        const cimg_ulong siz = cimg::ftell(file);
-        cimg::fclose(file);
-        if (siz>0 && res==CURLE_OK) {
-          cimg::exception_mode(omode);
-          return filename_local;
-        } else std::remove(filename_local);
-      }
-    } catch (...) { }
-    cimg::exception_mode(omode);
-    if (!try_fallback) throw CImgIOException("cimg::load_network(): Failed to load file '%s' with libcurl.",url);
-#endif
-
-    CImg<char> command((unsigned int)std::strlen(url) + 64);
-    cimg::unused(try_fallback);
-
-    // Try with 'curl' first.
-    if (timeout) {
-      if (referer)
-        cimg_snprintf(command,command._width,"%s -e %s -m %u -f --silent --compressed -o \"%s\" \"%s\"",
-                      cimg::curl_path(),referer,timeout,filename_local,url);
-      else
-        cimg_snprintf(command,command._width,"%s -m %u -f --silent --compressed -o \"%s\" \"%s\"",
-                      cimg::curl_path(),timeout,filename_local,url);
-    } else {
-      if (referer)
-        cimg_snprintf(command,command._width,"%s -e %s -f --silent --compressed -o \"%s\" \"%s\"",
-                      cimg::curl_path(),referer,filename_local,url);
-      else
-        cimg_snprintf(command,command._width,"%s -f --silent --compressed -o \"%s\" \"%s\"",
-                      cimg::curl_path(),filename_local,url);
-    }
-    cimg::system(command);
-
-    if (!(file = std_fopen(filename_local,"rb"))) {
-
-      // Try with 'wget' otherwise.
-      if (timeout) {
-        if (referer)
-          cimg_snprintf(command,command._width,"%s --referer=%s -T %u -q -r -l 0 --no-cache -O \"%s\" \"%s\"",
-                        cimg::wget_path(),referer,timeout,filename_local,url);
-        else
-          cimg_snprintf(command,command._width,"%s -T %u -q -r -l 0 --no-cache -O \"%s\" \"%s\"",
-                        cimg::wget_path(),timeout,filename_local,url);
-      } else {
-        if (referer)
-          cimg_snprintf(command,command._width,"%s --referer=%s -q -r -l 0 --no-cache -O \"%s\" \"%s\"",
-                        cimg::wget_path(),referer,filename_local,url);
-        else
-          cimg_snprintf(command,command._width,"%s -q -r -l 0 --no-cache -O \"%s\" \"%s\"",
-                        cimg::wget_path(),filename_local,url);
-      }
-      cimg::system(command);
-
-      if (!(file = std_fopen(filename_local,"rb")))
-        throw CImgIOException("cimg::load_network(): Failed to load file '%s' with external commands "
-                              "'wget' or 'curl'.",url);
-      cimg::fclose(file);
-
-      // Try gunzip it.
-      cimg_snprintf(command,command._width,"%s.gz",filename_local);
-      std::rename(filename_local,command);
-      cimg_snprintf(command,command._width,"%s --quiet \"%s.gz\"",
-                    gunzip_path(),filename_local);
-      cimg::system(command);
-      file = std_fopen(filename_local,"rb");
-      if (!file) {
-        cimg_snprintf(command,command._width,"%s.gz",filename_local);
-        std::rename(command,filename_local);
-        file = std_fopen(filename_local,"rb");
-      }
-    }
-    cimg::fseek(file,0,SEEK_END); // Check if file size is 0.
-    if (std::ftell(file)<=0)
-      throw CImgIOException("cimg::load_network(): Failed to load URL '%s' with external commands "
-                            "'wget' or 'curl'.",url);
-    cimg::fclose(file);
-    return filename_local;
-  }
-
-  // Implement a tic/toc mechanism to display elapsed time of algorithms.
-  inline cimg_ulong tictoc(const bool is_tic) {
-    cimg::mutex(2);
-    static CImg<cimg_ulong> times(64);
-    static unsigned int pos = 0;
-    const cimg_ulong t1 = cimg::time();
-    if (is_tic) { // Tic.
-      times[pos++] = t1;
-      if (pos>=times._width)
-        throw CImgArgumentException("cimg::tic(): Too much calls to 'cimg::tic()' without calls to 'cimg::toc()'.");
-      cimg::mutex(2,0);
-      return t1;
-    }
-    // Toc.
-    if (!pos)
-      throw CImgArgumentException("cimg::toc(): No previous call to 'cimg::tic()' has been made.");
-    const cimg_ulong
-      t0 = times[--pos],
-      dt = t1>=t0?(t1 - t0):cimg::type<cimg_ulong>::max();
-    const unsigned int
-      edays = (unsigned int)(dt/86400000.0),
-      ehours = (unsigned int)((dt - edays*86400000.0)/3600000.0),
-      emin = (unsigned int)((dt - edays*86400000.0 - ehours*3600000.0)/60000.0),
-      esec = (unsigned int)((dt - edays*86400000.0 - ehours*3600000.0 - emin*60000.0)/1000.0),
-      ems = (unsigned int)(dt - edays*86400000.0 - ehours*3600000.0 - emin*60000.0 - esec*1000.0);
-    if (!edays && !ehours && !emin && !esec)
-      std::fprintf(cimg::output(),"%s[CImg]%*sElapsed time: %u ms%s\n",
-                   cimg::t_red,1 + 2*pos,"",ems,cimg::t_normal);
-    else {
-      if (!edays && !ehours && !emin)
-        std::fprintf(cimg::output(),"%s[CImg]%*sElapsed time: %u sec %u ms%s\n",
-                     cimg::t_red,1 + 2*pos,"",esec,ems,cimg::t_normal);
-      else {
-        if (!edays && !ehours)
-          std::fprintf(cimg::output(),"%s[CImg]%*sElapsed time: %u min %u sec %u ms%s\n",
-                       cimg::t_red,1 + 2*pos,"",emin,esec,ems,cimg::t_normal);
-        else{
-          if (!edays)
-            std::fprintf(cimg::output(),"%s[CImg]%*sElapsed time: %u hours %u min %u sec %u ms%s\n",
-                         cimg::t_red,1 + 2*pos,"",ehours,emin,esec,ems,cimg::t_normal);
-          else{
-            std::fprintf(cimg::output(),"%s[CImg]%*sElapsed time: %u days %u hours %u min %u sec %u ms%s\n",
-                         cimg::t_red,1 + 2*pos,"",edays,ehours,emin,esec,ems,cimg::t_normal);
-          }
-        }
-      }
-    }
-    cimg::mutex(2,0);
-    return dt;
-  }
-
-  // Return a temporary string describing the size of a memory buffer.
-  inline const char *strbuffersize(const cimg_ulong size) {
-    static CImg<char> res(256);
-    cimg::mutex(5);
-    if (size<1024LU) cimg_snprintf(res,res._width,"%lu byte%s",(unsigned long)size,size>1?"s":"");
-    else if (size<1024*1024LU) { const float nsize = size/1024.0f; cimg_snprintf(res,res._width,"%.1f Kio",nsize); }
-    else if (size<1024*1024*1024LU) {
-      const float nsize = size/(1024*1024.0f); cimg_snprintf(res,res._width,"%.1f Mio",nsize);
-    } else { const float nsize = size/(1024*1024*1024.0f); cimg_snprintf(res,res._width,"%.1f Gio",nsize); }
-    cimg::mutex(5,0);
-    return res;
-  }
-
-  //! Display a simple dialog box, and wait for the user's response.
-  /**
-     \param title Title of the dialog window.
-     \param msg Main message displayed inside the dialog window.
-     \param button1_label Label of the 1st button.
-     \param button2_label Label of the 2nd button (\c 0 to hide button).
-     \param button3_label Label of the 3rd button (\c 0 to hide button).
-     \param button4_label Label of the 4th button (\c 0 to hide button).
-     \param button5_label Label of the 5th button (\c 0 to hide button).
-     \param button6_label Label of the 6th button (\c 0 to hide button).
-     \param logo Image logo displayed at the left of the main message.
-     \param is_centered Tells if the dialog window must be centered on the screen.
-     \return Indice of clicked button (from \c 0 to \c 5), or \c -1 if the dialog window has been closed by the user.
-     \note
-     - Up to 6 buttons can be defined in the dialog window.
-     - The function returns when a user clicked one of the button or closed the dialog window.
-     - If a button text is set to 0, the corresponding button (and the followings) will not appear in the dialog box.
-     At least one button must be specified.
-  **/
-  template<typename t>
-  inline int dialog(const char *const title, const char *const msg,
-                    const char *const button1_label, const char *const button2_label,
-                    const char *const button3_label, const char *const button4_label,
-                    const char *const button5_label, const char *const button6_label,
-                    const CImg<t>& logo, const bool is_centered=false) {
-#if cimg_display==0
-    cimg::unused(title,msg,button1_label,button2_label,button3_label,button4_label,button5_label,button6_label,
-                 logo._data,is_centered);
-    throw CImgIOException("cimg::dialog(): No display available.");
-#else
-    static const unsigned char
-      black[] = { 0,0,0 }, white[] = { 255,255,255 }, gray[] = { 200,200,200 }, gray2[] = { 150,150,150 };
-
-    // Create buttons and canvas graphics
-    CImgList<unsigned char> buttons, cbuttons, sbuttons;
-    if (button1_label) { CImg<unsigned char>().draw_text(0,0,button1_label,black,gray,1,13).move_to(buttons);
-      if (button2_label) { CImg<unsigned char>().draw_text(0,0,button2_label,black,gray,1,13).move_to(buttons);
-        if (button3_label) { CImg<unsigned char>().draw_text(0,0,button3_label,black,gray,1,13).move_to(buttons);
-          if (button4_label) { CImg<unsigned char>().draw_text(0,0,button4_label,black,gray,1,13).move_to(buttons);
-            if (button5_label) { CImg<unsigned char>().draw_text(0,0,button5_label,black,gray,1,13).move_to(buttons);
-              if (button6_label) { CImg<unsigned char>().draw_text(0,0,button6_label,black,gray,1,13).move_to(buttons);
-              }}}}}}
-    if (!buttons._width)
-      throw CImgArgumentException("cimg::dialog(): No buttons have been defined.");
-    cimglist_for(buttons,l) buttons[l].resize(-100,-100,1,3);
-
-    unsigned int bw = 0, bh = 0;
-    cimglist_for(buttons,l) { bw = std::max(bw,buttons[l]._width); bh = std::max(bh,buttons[l]._height); }
-    bw+=8; bh+=8;
-    if (bw<64) bw = 64;
-    if (bw>128) bw = 128;
-    if (bh<24) bh = 24;
-    if (bh>48) bh = 48;
-
-    CImg<unsigned char> button(bw,bh,1,3);
-    button.draw_rectangle(0,0,bw - 1,bh - 1,gray);
-    button.draw_line(0,0,bw - 1,0,white).draw_line(0,bh - 1,0,0,white);
-    button.draw_line(bw - 1,0,bw - 1,bh - 1,black).draw_line(bw - 1,bh - 1,0,bh - 1,black);
-    button.draw_line(1,bh - 2,bw - 2,bh - 2,gray2).draw_line(bw - 2,bh - 2,bw - 2,1,gray2);
-    CImg<unsigned char> sbutton(bw,bh,1,3);
-    sbutton.draw_rectangle(0,0,bw - 1,bh - 1,gray);
-    sbutton.draw_line(0,0,bw - 1,0,black).draw_line(bw - 1,0,bw - 1,bh - 1,black);
-    sbutton.draw_line(bw - 1,bh - 1,0,bh - 1,black).draw_line(0,bh - 1,0,0,black);
-    sbutton.draw_line(1,1,bw - 2,1,white).draw_line(1,bh - 2,1,1,white);
-    sbutton.draw_line(bw - 2,1,bw - 2,bh - 2,black).draw_line(bw - 2,bh - 2,1,bh - 2,black);
-    sbutton.draw_line(2,bh - 3,bw - 3,bh - 3,gray2).draw_line(bw - 3,bh - 3,bw - 3,2,gray2);
-    sbutton.draw_line(4,4,bw - 5,4,black,1,0xAAAAAAAA,true).draw_line(bw - 5,4,bw - 5,bh - 5,black,1,0xAAAAAAAA,false);
-    sbutton.draw_line(bw - 5,bh - 5,4,bh - 5,black,1,0xAAAAAAAA,false).draw_line(4,bh - 5,4,4,black,1,0xAAAAAAAA,false);
-    CImg<unsigned char> cbutton(bw,bh,1,3);
-    cbutton.draw_rectangle(0,0,bw - 1,bh - 1,black).draw_rectangle(1,1,bw - 2,bh - 2,gray2).
-      draw_rectangle(2,2,bw - 3,bh - 3,gray);
-    cbutton.draw_line(4,4,bw - 5,4,black,1,0xAAAAAAAA,true).draw_line(bw - 5,4,bw - 5,bh - 5,black,1,0xAAAAAAAA,false);
-    cbutton.draw_line(bw - 5,bh - 5,4,bh - 5,black,1,0xAAAAAAAA,false).draw_line(4,bh - 5,4,4,black,1,0xAAAAAAAA,false);
-
-    cimglist_for(buttons,ll) {
-      CImg<unsigned char>(cbutton).
-        draw_image(1 + (bw  -buttons[ll].width())/2,1 + (bh - buttons[ll].height())/2,buttons[ll]).
-        move_to(cbuttons);
-      CImg<unsigned char>(sbutton).
-        draw_image((bw - buttons[ll].width())/2,(bh - buttons[ll].height())/2,buttons[ll]).
-        move_to(sbuttons);
-      CImg<unsigned char>(button).
-        draw_image((bw - buttons[ll].width())/2,(bh - buttons[ll].height())/2,buttons[ll]).
-        move_to(buttons[ll]);
-    }
-
-    CImg<unsigned char> canvas;
-    if (msg)
-      ((CImg<unsigned char>().draw_text(0,0,"%s",gray,0,1,13,msg)*=-1)+=200).resize(-100,-100,1,3).move_to(canvas);
-
-    const unsigned int
-      bwall = (buttons._width - 1)*(12 + bw) + bw,
-      w = cimg::max(196U,36 + logo._width + canvas._width,24 + bwall),
-      h = cimg::max(96U,36 + canvas._height + bh,36 + logo._height + bh),
-      lx = 12 + (canvas._data?0:((w - 24 - logo._width)/2)),
-      ly = (h - 12 - bh - logo._height)/2,
-      tx = lx + logo._width + 12,
-      ty = (h - 12 - bh - canvas._height)/2,
-      bx = (w - bwall)/2,
-      by = h - 12 - bh;
-
-    if (canvas._data)
-      canvas = CImg<unsigned char>(w,h,1,3).
-        draw_rectangle(0,0,w - 1,h - 1,gray).
-        draw_line(0,0,w - 1,0,white).draw_line(0,h - 1,0,0,white).
-        draw_line(w - 1,0,w - 1,h - 1,black).draw_line(w - 1,h - 1,0,h - 1,black).
-        draw_image(tx,ty,canvas);
-    else
-      canvas = CImg<unsigned char>(w,h,1,3).
-        draw_rectangle(0,0,w - 1,h - 1,gray).
-        draw_line(0,0,w - 1,0,white).draw_line(0,h - 1,0,0,white).
-        draw_line(w - 1,0,w - 1,h - 1,black).draw_line(w - 1,h - 1,0,h - 1,black);
-    if (logo._data) canvas.draw_image(lx,ly,logo);
-
-    unsigned int xbuttons[6] = { 0 };
-    cimglist_for(buttons,lll) { xbuttons[lll] = bx + (bw + 12)*lll; canvas.draw_image(xbuttons[lll],by,buttons[lll]); }
-
-    // Open window and enter events loop
-    CImgDisplay disp(canvas,title?title:" ",0,false,is_centered?true:false);
-    if (is_centered) disp.move((CImgDisplay::screen_width() - disp.width())/2,
-                               (CImgDisplay::screen_height() - disp.height())/2);
-    bool stop_flag = false, refresh = false;
-    int oselected = -1, oclicked = -1, selected = -1, clicked = -1;
-    while (!disp.is_closed() && !stop_flag) {
-      if (refresh) {
-        if (clicked>=0)
-          CImg<unsigned char>(canvas).draw_image(xbuttons[clicked],by,cbuttons[clicked]).display(disp);
-        else {
-          if (selected>=0)
-            CImg<unsigned char>(canvas).draw_image(xbuttons[selected],by,sbuttons[selected]).display(disp);
-          else canvas.display(disp);
-        }
-        refresh = false;
-      }
-      disp.wait(15);
-      if (disp.is_resized()) disp.resize(disp,false);
-
-      if (disp.button()&1)  {
-        oclicked = clicked;
-        clicked = -1;
-        cimglist_for(buttons,l)
-          if (disp.mouse_y()>=(int)by && disp.mouse_y()<(int)(by + bh) &&
-              disp.mouse_x()>=(int)xbuttons[l] && disp.mouse_x()<(int)(xbuttons[l] + bw)) {
-            clicked = selected = l;
-            refresh = true;
-          }
-        if (clicked!=oclicked) refresh = true;
-      } else if (clicked>=0) stop_flag = true;
-
-      if (disp.key()) {
-        oselected = selected;
-        switch (disp.key()) {
-        case cimg::keyESC : selected = -1; stop_flag = true; break;
-        case cimg::keyENTER : if (selected<0) selected = 0; stop_flag = true; break;
-        case cimg::keyTAB :
-        case cimg::keyARROWRIGHT :
-        case cimg::keyARROWDOWN : selected = (selected + 1)%buttons.width(); break;
-        case cimg::keyARROWLEFT :
-        case cimg::keyARROWUP : selected = (selected + buttons.width() - 1)%buttons.width(); break;
-        }
-        disp.set_key();
-        if (selected!=oselected) refresh = true;
-      }
-    }
-    if (!disp) selected = -1;
-    return selected;
-#endif
-  }
-
-  //! Display a simple dialog box, and wait for the user's response \specialization.
-  inline int dialog(const char *const title, const char *const msg,
-                    const char *const button1_label, const char *const button2_label, const char *const button3_label,
-                    const char *const button4_label, const char *const button5_label, const char *const button6_label,
-                    const bool is_centered) {
-    return dialog(title,msg,button1_label,button2_label,button3_label,button4_label,button5_label,button6_label,
-                  CImg<unsigned char>::_logo40x38(),is_centered);
-  }
-
-  //! Evaluate math expression.
-  /**
-     \param expression C-string describing the formula to evaluate.
-     \param x Value of the pre-defined variable \c x.
-     \param y Value of the pre-defined variable \c y.
-     \param z Value of the pre-defined variable \c z.
-     \param c Value of the pre-defined variable \c c.
-     \return Result of the formula evaluation.
-     \note Set \c expression to \c 0 to keep evaluating the last specified \c expression.
-     \par Example
-     \code
-     const double
-     res1 = cimg::eval("cos(x)^2 + sin(y)^2",2,2),  // will return '1'.
-     res2 = cimg::eval(0,1,1);                    // will return '1' too.
-     \endcode
-  **/
-  inline double eval(const char *const expression, const double x, const double y, const double z, const double c) {
-    static const CImg<float> empty;
-    return empty.eval(expression,x,y,z,c);
-  }
-
-  template<typename t>
-  inline CImg<typename cimg::superset<double,t>::type> eval(const char *const expression, const CImg<t>& xyzc) {
-    static const CImg<float> empty;
-    return empty.eval(expression,xyzc);
-  }
-
-  // End of cimg:: namespace
-}
-
-  // End of cimg_library:: namespace
-}
-
-//! Short alias name.
-namespace cil = cimg_library_suffixed;
-
-#ifdef _cimg_redefine_False
-#define False 0
-#endif
-#ifdef _cimg_redefine_True
-#define True 1
-#endif
-#ifdef _cimg_redefine_None
-#define None 0
-#endif
-#ifdef _cimg_redefine_min
-#define min(a,b) (((a)<(b))?(a):(b))
-#endif
-#ifdef _cimg_redefine_max
-#define max(a,b) (((a)>(b))?(a):(b))
-#endif
-#ifdef _cimg_redefine_PI
-#define PI 3.141592653589793238462643383
-#endif
-#ifdef _MSC_VER
-#pragma warning(pop)
-#endif
-
-#endif
-// Local Variables:
-// mode: c++
-// End: