[sane-devel] Canon LIDE 90

[Pierre Willenbrock]

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.