Is there such thing as a 'soft checksum' tool?

[Michael David Crawford]

> M> I'm looking for a pseudo-checksum tool for use with cataloging images.

I've seen such tools advertised, but they were proprietary products and 
only worked on windows.

One way you could approach it might be to use a blur filter to blur each 
of your images, and then to compare the blurred images.  Small 
differences in individual pixels would be blurred away.

Mike
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Michael David Crawford
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