README.pngcomp

PNGCOMP - PNG COMPARISON
VERSION 1.1

USAGE: 
  pngcomp [-vVhRL] image1.png image2.png

  options: v - verbose, does nothing as yet.
           V - version, prints version information.
           h - help, prionts this message.
           R - use RGBA colorspace
           L - use LUVA colorspace.
           
  inputs: image1.png and image2.png are the two images that are to be compared.
          it is required that they be the same size.

  This program give some basic statistics about the difference between two images.
  It was created as a measure of various color quantization methods.


NOTES:
The stats created by this program are purely based on the Euclidean distance 
in RGBA or LUVA space between the pixels of the images. 

The error calculation used reflects the perceived quality of images only roughly. 
To determine what image is better nothing can surpass having a look for
yourself! 

Copyright (c) Stuart Coyle 2004-2009 stuart.coyle@gmail.com

See LICENCE for details of copyrights held on this program.