Image Comparison

[eric -dot- dunn -at- ca -dot- transport -dot- bombardier -dot- com]

Does any one know of an application (or other quick method) to compare 
image files? Ultimately, most of the files to be compared are CGM, but we 
receive a wide variety of formats. DWG, WMF, AI, etc.

Essentially, a number of suppliers have the nasty habit of checking out 
ALL their illustrations and then uploading and checking them ALL back in 
to our system. This means that all of them must be verified and approved, 
whether they've been changed or not. Additionally, they must be verified 
against comments made to see if the comments have been closed or not.

A binary compare is only really useful to tell if the illustrations are 
identical. Really what would be the best would be a way to display two 
illustrations, one superimposed on the other, with the differences 
highlighted.

Ideally, we'd also be able to add a validation script to out system so 
that basics could be verified without human intervention (illustration 
size, font, font size, minimum line weight, etc)

Any ideas?

Eric L. Dunn
Senior Technical Writer

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