dogtail-devel PerceptualDiff - An image comparison utility

[David Malcolm <dmalcolm redhat com>]

IIRC we're currently using ImageMagick for doing screenshot comparisons.
        
I spotted this project:
http://pdiff.sourceforge.net/
"PerceptualDiff is an image comparison utility that makes use of a
computational model of the human visual system to compare two images."
        
I'm doomed timewise ATM; maybe worth investigating though?
                
(for those of us using Fedora, packages are currently going through
review as bug 223657)
                
Hope this helps
Dave