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Old 06-14-2008, 12:33 PM   #7
terrie
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Join Date: Oct 2004
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marjolein: Using software that implements the specific algorithm. If you change a single byte in the source file, you can be guaranteed that the resulting hash will be not the same.
That makes perfect sense to me but the question that I have is...

If you create an image using any of the imaging software available and save the image as let's say a jpg and upload it to some webpage, is there code built into all image processing programs that generates a hash checksum which one could check later using one of the programs you or Bo mentioned?

Or am I misunderstanding the process???

There is a part of me that is very uneasy about the idea that each of my images has some sort of unique fingerprint that could be used to track the image when I haven't deliberately used anything to generate that fingerprint--as in using the Digimarc system for example.

Terrie
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