The package contains code for computing the COL_DIST perceptual color distance.
The approach was described in the paper:
Improving Perceptual Color Difference using Basic Color Terms
To get started download the zip file and read the README.txt file, or simply start looking at the COL_DIST.m file.
To get an email when a new version of COL_DIST is published, subscribe to COL_DIST Google group.