[sane-devel] canon lide 200 sane-backends-1.0.27 --res=300 issue

Olaf Meeuwissen paddy-hack at member.fsf.org
Mon May 21 13:54:11 BST 2018

Hi Robert,

Robert A. Schmied writes:

> aloha saners (and xsaners)
> with both scanimage and xsane there appears to be an issue
> with --resolution=300 for my canon canoscan lide 200.
> with --resolution=300 --depth=8 and [ --mode=gray | --mode=line ]
> the scan works ok.
> however, with --resolution=300 --depth=8 --mode=color
> the pixels are stretched in the +y direction and the scan
> stops at about y_pixel 3294 (about 1/2 of sheet at  y-length 142 mm).

Hmm, smells like the scanner expects different resolutions for x and y
directions.  Does the backend expose --x-resolution and --y-resolution
options?  If it does, using

  --x-resolution=300 --y-resolution=600

might solve your problem.

> if i run a scan with 16 bit depth in --mode=gray the y pixel
> stretching starts at y-length 82 mm.
> very limited testing with --res=600 and higher does not show this
> problem for any -y values.

Hope this helps,
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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