A CNET reviewer got an interesting surprise when attempting to print a scanned image of one of the newly-redesigned U.S. $5 bills: Photoshop somehow recognizes that the image looks like a banknote and refuses to print it.
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“This Application Does Not Support the Printing of Banknote Images”
September 25th, 2007 · 2 Comments · Web/Tech
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How it works is described here:
http://en.wikipedia.org/wiki/EURion_constellation
Neat, thanks for posting that, Andrew.