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invert.cxx

Invert an image file (create a negative) using the function transformImage()
Usage: invert infile outfile

/************************************************************************/
/* */
/* Copyright 1998-2002 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
/* restriction, including without limitation the rights to use, */
/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
/* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, */
/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#include <iostream>
#include "vigra/stdimage.hxx"
#include "vigra/stdimagefunctions.hxx"
#include "vigra/impex.hxx"
#include <string.h>
using namespace vigra;
int main(int argc, char ** argv)
{
if(argc != 3)
{
std::cout << "Usage: " << argv[0] << " infile outfile" << std::endl;
std::cout << "(supported formats: " << vigra::impexListFormats() << ")" << std::endl;
return 1;
}
try
{
vigra::ImageImportInfo info(argv[1]);
if(info.isGrayscale())
{
vigra::BImage in(info.width(), info.height());
vigra::BImage out(info.width(), info.height());
importImage(info, destImage(in));
// create a negative image by applying the expression
// newvalue = -1 * (oldvalue - 255)
// to each pixel
transformImage(srcImageRange(in), destImage(out),
if(strcmp(argv[2], "-") == 0)
{
// write stdout
exportImage(srcImageRange(out),
vigra::ImageExportInfo(argv[2]).setFileType(info.getFileType()));
}
else
{
exportImage(srcImageRange(out), vigra::ImageExportInfo(argv[2]));
}
}
else
{
vigra::BRGBImage in(info.width(), info.height());
vigra::BRGBImage out(info.width(), info.height());
importImage(info, destImage(in));
vigra::RGBValue<int> offset(-255, -255, -255);
// create a negative image by applying the expression
// newvalue = -1 * (oldvalue + RGBValue<int>(-255, -255, -255))
// to each pixel
transformImage(srcImageRange(in), destImage(out),
if(strcmp(argv[2], "-") == 0)
{
// write stdout
exportImage(srcImageRange(out),
vigra::ImageExportInfo(argv[2]).setFileType(info.getFileType()));
}
else
{
exportImage(srcImageRange(out), vigra::ImageExportInfo(argv[2]));
}
}
}
catch (vigra::StdException & e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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vigra 1.9.0 (Sat Oct 5 2013)