> -----Urspr?ngliche Nachricht-----
> Von: "Pierre Willenbrock" <pierre at pirsoft.dnsalias.org>
> Gesendet: 27.11.07 22:23:19
> An: Ralf Haueisen <ralf.haueisen at web.de>
> CC: sane-devel at lists.alioth.debian.org
> Betreff: Re: [sane-devel] Canon LIDE 90
>
> Ralf Haueisen schrieb:
> >>
> >> Can you send a small image?
> >>
> >
> > The image shows the cover of a book...
> >
>
> This looks like the shading correction(corrects for the properties of
> each ccd cell) is making the image worse. please disable it by changing
> gl841_init_optical_regs_scan to only disable it:
>
> /* if (flags & OPTICAL_FLAG_DISABLE_SHADING)*/
> r->value &= ~REG01_DVDSET;
> /* else
> r->value |= REG01_DVDSET;*/
>
> The resulting image may give better information. Another possibility is
> to look at the generated black_white_shading.pnm when
> SANE_DEBUG_GENESYS=255 is set in the environment.
>
the black_white_shading.pnm is just noise without structure
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