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List:       gimp-print-devel
Subject:    Re: [Gimp-print-devel] Yuck
From:       Michael Sweet <mike () easysw ! com>
Date:       2004-01-21 12:10:52
Message-ID: 400E6C4C.6020009 () easysw ! com
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Roger Leigh wrote:
> Robert L Krawitz <rlk@alum.mit.edu> writes:
> 
> 
>>Apparently some applications (Photoshop and some HP printer drivers)
>>are detecting attempts to scan or print currency and rejecting them.
>>This is nasty stuff.
>>
>>http://www.securityfocus.com/archive/1/350093/2004-01-17/2004-01-23/0
> 
> 
> I read something about this a few months ago.  It's all done in the
> driver, isn't it?  IIRC I did read that some high-end printers have
> this in the firmware though!
> 
> It's going to limit what you can print though.  After all, fine lines
> and shades of green etc. aren't only used on notes...
> 
> OTOH, with a modern inkjet, I guess you could print some very
> convincing notes if you have the right paper, so counterfeiting is a
> very real danger.  Not that I approve of this--I don't.

As I understand it, the printers/drivers/apps look for a
characteristic pattern of 5 1mm circles, primarily in the blue
channel.  There was a link to a PDF file describing it in a slashdot
posting (search for "eurion.pdf").

-- 
______________________________________________________________________
Michael Sweet, Easy Software Products                  mike@easysw.com
Printing Software for UNIX                       http://www.easysw.com



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