shakyShane/p-diff
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perceptualdiff - a program that compares two images using a perceptually based image metric. Copyright (C) 2006 Yangli Hector Yee yeehector@users.sourceforge.net http://pdiff.sourceforge.net/ This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details in the file gpl.txt. Build Instructions 1. Download cross platform make from http://www.cmake.org 2. Download freeimage from https://sourceforge.net/projects/freeimage 3. Edit CMakeLists.txt to tell it where to find your free image build 4. Type cmake . 5. Type make . (or on Windows systems cmake makes a Visual Studio Project file) 6. To specify the install directory, use make install DESTDIR="/home/me/mydist" Usage perceptualdiff image1.(tif | png) image2.(tif | png) [options] -verbose : Turns on verbose mode -fov deg: field of view, deg, in degrees. Usually between 10.0 to 85.0. This controls how much of the screen the oberserver is seeing. Front row of a theatre has a field of view of around 25 degrees. Back row has a field of view of around 60 degrees. -threshold p : Sets the number of pixels, p, to reject. For example if p is 100, then the test fails if 100 or more pixels are perceptably different. -gamma g : The gamma to use to convert to RGB linear space. Default is 2.2 -luminance l: The luminance of the display the observer is seeing. Default is 100 candela per meter squared -output foo.ppm : Saves the difference image to foo.ppm Credits Hector Yee, project administrator and originator - hectorgon.blogspot.com Scott Corley, for png file IO code Tobias Sauerwein, for make install, package_source Cmake configuration Cairo Team for bugfixes Jim Tilander, Rewrote the IO to use FreeImage. Version History 1.0 - Initial distribution 1.0.1 - Fixed off by one convolution error and libpng interface to 1.2.8 1.0.2 - [jt] Converted the loading and saving routines to use FreeImage
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