[sane-devel] Canon LIDE 90

Pierre Willenbrock pierre at pirsoft.dnsalias.org
Tue Nov 27 21:21:24 UTC 2007

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:

	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.

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