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Manuel Stoeckl 0490607584 pdiff: convert RGB24 image values to ARGB32 on read 
To avoid reading a potentially garbage alpha channel when users
of pdiff_compare pass in RGB24 images, if the format is RGB24,
force the alpha channel to be 0xff.

This commit also updates CI to adjust for the new tests that have
started/stopped failing. New failures often are cases where
the reference image has alpha transparency, but the test output
does not; new passing tests may indicate that the unused alpha
channel of an RGB24 image was garbage, but now is ignored.
2021-08-29 11:56:27 -04:00
..
.gitignore
args.c Misc. typos 2019-01-31 17:37:15 -08:00
args.h Misc. typos 2019-01-31 17:37:15 -08:00
CMakeLists.txt
gpl.txt
lpyramid.c Remove some useless declarations found by scan-build, the LLVM/clang static analyzer 2014-05-06 10:14:53 -07:00
lpyramid.h
Makefile.am
Makefile.win32 build: Clean up environment variables and flags for the win32 build 2011-06-20 10:24:21 +02:00
meson.build meson: Use more dependency objects 2021-05-22 07:59:52 +02:00
pdiff.c pdiff: convert RGB24 image values to ARGB32 on read 2021-08-29 11:56:27 -04:00
pdiff.h
perceptualdiff.c pdiff: Drop unused variable 2013-07-04 09:27:56 +01:00
README.txt

README.txt 

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