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/*
#
# File : fade_images.cpp
# ( C++ source file )
#
# Description : Compute a linear fading between two images.
# This file is a part of the CImg Library project.
# ( http://cimg.eu )
#
# Copyright : David Tschumperle
# ( http://tschumperle.users.greyc.fr/ )
#
# License : CeCILL v2.0
# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
#
# This software is governed by the CeCILL 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
# license 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 license and that you accept its terms.
#
*/
#include "CImg.h"
#ifndef cimg_imagepath
#define cimg_imagepath "img/"
#endif
#undef min
#undef max
// Main procedure
//---------------
int main(int argc,char **argv) {
// Read and check command line parameters.
cimg_usage("Compute a linear fading between two 2D images");
const char *file_i1 = cimg_option("-i1",cimg_imagepath "sh0r.pgm","Input Image 1");
const char *file_i2 = cimg_option("-i2",cimg_imagepath "milla.bmp","Input Image 2");
const char *file_o = cimg_option("-o",(char*)0,"Output Image");
const bool visu = cimg_option("-visu",true,"Visualization mode");
const double pmin = cimg_option("-min",40.0,"Begin of the fade (in %)")/100.0;
const double pmax = cimg_option("-max",60.0,"End of the fade (in %)")/100.0;
const double angle = cimg_option("-angle",0.0,"Fade angle")*cil::cimg::PI/180;
// Init images.
cil::CImg<unsigned char> img1(file_i1), img2(file_i2);
if (!img2.is_sameXYZC(img1)) {
int
dx = std::max(img1.width(),img2.width()),
dy = std::max(img1.height(),img2.height()),
dz = std::max(img1.depth(),img2.depth()),
dv = std::max(img1.spectrum(),img2.spectrum());
img1.resize(dx,dy,dz,dv,3);
img2.resize(dx,dy,dz,dv,3);
}
cil::CImg<unsigned char> dest(img1);
// Compute the faded image.
const double ca = std::cos(angle), sa = std::sin(angle);
double alpha;
cimg_forXYZC(dest,x,y,z,k) {
const double X = ((double)x/img1.width() - 0.5)*ca + ((double)y/img1.height() - 0.5)*sa;
if (X + 0.5<pmin) alpha = 0; else {
if (X + 0.5>pmax) alpha = 1; else
alpha = (X + 0.5 - pmin)/(pmax - pmin);
}
dest(x,y,z,k) = (unsigned char)((1 - alpha)*img1(x,y,z,k) + alpha*img2(x,y,z,k));
}
// Save and exit
if (file_o) dest.save(file_o);
if (visu) dest.display("Image fading");
return 0;
}