Find similar images using python

[Thomas W]

How can I use python to find images that looks quite similar? Thought
I'd scale the images down to 32x32 and convert it to use a standard
palette of 256 colors then compare the result pixel for pixel etc, but
it seems as if this would take a very long time to do when processing
lots of images.

Any hint/clue on this subject would be appreciated.

Best regards,
Thomas