JPEG compression slipped in?

Hi...

If I scan a page of text at 200dpi in color mode (for
example) with
xsane, then zoom in to 400%, I can see jpeg-like artifacts
around
letters and other sharp lines.  This isn't an artifact of
the xsane
zooming process, as saving the file as a TIFF and examining
the
individual pixels with another program will also show the
artifacts.

Is there an option to turn this off?

Thanks!
-- 
PF <sanedevelch.pkts.ca>


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On Tuesday 30 January 2007 01:36:16 PF wrote:
> Hi...
>
> If I scan a page of text at 200dpi in color mode (for
example) with
> xsane, then zoom in to 400%, I can see jpeg-like
artifacts around
> letters and other sharp lines.  This isn't an artifact
of the xsane
> zooming process, as saving the file as a TIFF and
examining the
> individual pixels with another program will also show
the artifacts.
>
> Is there an option to turn this off?

Maybe your device sends JPEG data and the backend is
transparently 
decompressing it ?

Which scanner are you using?

-- 
  René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
  http://exactcode.de | http://t2-project.org | http://rene.rebe.name
  +49 (0)30 / 255 897 45

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On Tue, 2007-01-30 at 11:07 +0100, Rene Rebe wrote:
> On Tuesday 30 January 2007 01:36:16 PF wrote:
> > Hi...
> >
> > If I scan a page of text at 200dpi in color mode
(for example) with
> > xsane, then zoom in to 400%, I can see jpeg-like
artifacts around
> > letters and other sharp lines.  This isn't an
artifact of the xsane
> > zooming process, as saving the file as a TIFF and
examining the
> > individual pixels with another program will also
show the artifacts.
> >
> > Is there an option to turn this off?
> 
> Maybe your device sends JPEG data and the backend is
transparently 
> decompressing it ?
> 
> Which scanner are you using?

I'm using an HP PSC 2175 (printer/scanner).  Converting to
JPEG in order
to squeeze more through the USB cable seems like overkill to
me, but
they may have done it.  What do you think?
-- 
PF <sanedevelch.pkts.ca>


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