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DPChallenge Forums >> Photography Discussion >> watermarks
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04/27/2005 08:02:05 PM · #1
Hi,

I keep hearing about watermarks, and I have a thing on photoshop that does them, but I dont know what they are... or what they are for? so... what the heck are they?
04/27/2005 08:21:05 PM · #2
I think a watermark is a semi-transparent copyright signature put across an image to prevent people using it. There might be another type of digital id too?
04/27/2005 09:34:07 PM · #3
Originally posted by PollyBean:

I think a watermark is a semi-transparent copyright signature put across an image to prevent people using it. There might be another type of digital id too?

This is a visible watermark, and is typically used for images displayed as stock images, as in my gallery at Shutterstock.

What you have in Photoshop is something called "DigiMarc" which is a supposedly INVISIBLE mark, which contains info about the file and photographer. If you register with DigiMarc you can get a customized watermark. The DigiMarc allows a stolen file to be identified, even though you can't see any difference.
04/27/2005 09:53:39 PM · #4
Note that Digimarc isn't an absolute protection: it is possible to detect and remove them if you know what you're doing. It does make a good casual signature, however, and in high resolution images the added noise generally isn't visible to the eye.
04/28/2005 09:21:46 AM · #5
Thanks for the info! SOOO much to learn!!

jen
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