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 PostPost subject: Printing something you shouldnt can get you into trouble        Posted: Wed Jan 31, 2007 6:26 am 
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http://en.wikipedia.org/wiki/Printer_steganography

Most colour lazer printers now do this. The printer at my college does too, I just checked an image I recently printed there with a UV torch. You can see them with the eye and the UV light if you look hard enough. They're dotted all over the page.

Be careful!

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 PostPost subject:        Posted: Wed Jan 31, 2007 7:25 am 
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I checked my printer and I didn't see any dots. (I don't want my operating system version, my ip, my system settings, my passwords all printed in every page) :wink:

But is it legal to do printers with that "dots"?


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 PostPost subject:        Posted: Wed Jan 31, 2007 7:28 am 
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It only does it on colour laser printers. Only three brands do it I think, it says on the wiki page. Yes its legal. Its only to track the date, time and some other details that can be used for basic tracking. Like it says it was designed to stop forgery.

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 PostPost subject:        Posted: Wed Jan 31, 2007 7:31 am 
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Will have to try this tomorrow.


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 PostPost subject:        Posted: Wed Jan 31, 2007 8:11 am 
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This is how programs like Photoshop recognise banknote images and don't let you print them - look at the bit on the front of a British banknote (others probably have it too, but I don't know what part of them has it) at the bottom in the middle (the circle that looks blank until you hold it up to the light and you see the watermark of the Queen's head) and you'll see the pattern of yellow dots. Every time you open an image in Photoshop it looks for the pattern that identifies banknotes. Colour photocopiers also do the same thing, and if you try to copy a banknote you'll instead be printed a page telling you why you shouldn't copy banknotes!

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 PostPost subject:        Posted: Wed Jan 31, 2007 8:16 am 
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Vista Ultimate R2 wrote:
This is how programs like Photoshop recognise banknote images and don't let you print them - look at the bit on the front of a British banknote (others probably have it too, but I don't know what part of them has it) at the bottom in the middle (the circle that looks blank until you hold it up to the light and you see the watermark of the Queen's head) and you'll see the pattern of yellow dots. Every time you open an image in Photoshop it looks for the pattern that identifies banknotes. Colour photocopiers also do the same thing, and if you try to copy a banknote you'll instead be printed a page telling you why you shouldn't copy banknotes!


Ill have to try that one day! :)

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 PostPost subject:        Posted: Thu Feb 01, 2007 3:03 am 
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1: Is there a list of printers which are involved in it and which are not?

2: Is this controlled by firmware or something else?


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 PostPost subject:        Posted: Fri Feb 02, 2007 11:50 am 
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im sure if someone is forging money, they would have altered the printer/photoshop it allow it.

i say it would be in the firmware


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