debian man page for pngcomp

PNGCOMP(1)						      General Commands Manual							PNGCOMP(1)

NAME
       pngcomp - PNG (Portable Network Graphics) comparison tool

SYNOPSIS
       pngcomp [-vVh] image1.png image2.png

DESCRIPTION
       pngcomp	gives  some  basic  statistics	about the difference between two images. It was created as a measure of various color quantization
       methods.

OPTIONS
       -v     Verbose, does nothing as yet.

       -V     Version, prints version information.

       -h     Help, prints this message.

NOTES
       The stats created by this program are purely based on the Euclidean distance in RGBA space between the pixels of the images. Later versions
       will include different measures such as CIE color space measurements and filters for perception models.

       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!

AUTHOR
       pngcomp was written by Stuart Coyle <stuart@cybertherial.com>.

       This manual page was written by Nelson A. de Oliveira <naoliv@gmail.com>, for the Debian project (but may be used by others).

							  Sat, 08 Jul 2006 00:54:16 -0300						PNGCOMP(1)