Mailinglist Archive: opensuse (2912 mails)

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Re: [SLE] How to avoid copying/scanning printed paper ?
  • From: Ciro Iriarte <cyruspy@xxxxxxxxx>
  • Date: Sun, 20 Feb 2005 09:44:25 -0400
  • Message-id: <a998a01405022005442923e21f@xxxxxxxxxxxxxx>
That sounds interesting Hans, how would you do it?, tools?

Ciro


On Sun, 20 Feb 2005 13:35:00 +0100, Hans Witvliet <hwit@xxxxxxxxxxx> wrote:
> On Sat, 2005-02-19 at 23:01, Carlos E. R. wrote:
>
> > It must be a special watermark designed to interfere with the scanner
> > matrix. The document can be scanned, but the quality is bad, and OCR does
> > not work. The design is most probably proprietary.
>
> You can experiment with colors.
> If you make a raster image with bars 5 mm spaced, in light orange, and
> ordinary text grey, there is no problem in normally reading it, but when
> scanning or copying (BW) it, the orange background will become
> foreground. And OCR will certainly fail.
>
> Hans
>
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