Posted by no-1 on 11/18/55 11:44

do you mean, are the files from the same original source? or do they
"look" the same?

You could use an OS level cmp (compare) utility -- Four Unix utilities,
cmp, comm and diff/sdiff, can be used to compare the contents of two
files.

to see if they "look" the same requires special recognition software
that - generally speaking - only governmental agencies can afford.

or:
http://news.cnet.co.uk/digitalcameras/0,39029664,49257088,00.htm
www.riya.com

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