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-pdiff - 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 libtiff from http://www.libtiff.org. Download libpng from http://www.libpng.org
-3. Edit CMakeLists.txt to tell it where to find your tiff library
-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
-
-pdiff 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
-
-Credits
-
-Hector Yee, project administrator and originator - hectorgon.blogspot.com
-Scott Corley, for png file IO code
-Mick Weiss, Linux build and release & QA
-Carl Worth, Rewrite as library, depend on cairo, and port to C
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