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invert.cxx | ![]() |
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Invert an image file (create a negative) using the function Algorithms to Transform Images
Usage: invert infile outfile
/************************************************************************/ /* */ /* Copyright 1998-2002 by Ullrich Koethe */ /* Cognitive Systems Group, University of Hamburg, Germany */ /* */ /* This file is part of the VIGRA computer vision library. */ /* ( Version 1.3.3, Aug 18 2005 ) */ /* You may use, modify, and distribute this software according */ /* to the terms stated in the LICENSE file included in */ /* the VIGRA distribution. */ /* */ /* The VIGRA Website is */ /* http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/ */ /* Please direct questions, bug reports, and contributions to */ /* koethe@informatik.uni-hamburg.de */ /* */ /* THIS SOFTWARE IS PROVIDED AS IS AND WITHOUT ANY EXPRESS OR */ /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */ /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* */ /************************************************************************/ #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), vigra::linearIntensityTransform(-1, -255)); 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), vigra::linearIntensityTransform(-1, offset)); 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 (koethe@informatik.uni-hamburg.de) |
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