[sane-devel] genesys Canon Lide 210 aspect-ratio-problem at 600 dpi

[Andrew Kanaber]

I hit the same problem with a Canon LiDE 110. I tried measuring the distortion
by scanning a sheet of graph paper in various modes. 

With sane 1.0.24 in 600dpi lineart and gray modes the scan is stretched
vertically by about 30%. Color mode scans are actually also stretched at
600dpi, but much less noticeably by about 2%. The stretching is still visible
though if you compare the scanned images side-by-side. With version 1.0.22 the
lineart and gray scans are correct at 600dpi but the 2%-ish stretching is
still present in 600dpi color mode.

In case it helps I've put some of the scans up at
http://www.chiark.greenend.org.uk/~akanaber/lide110/

Let me know if there's something else I can do that might help,

Andrew

M G Berberich wrote:
> Hello,
> 
> Canon LiDE 210 with sane-backends 1.0.24 (libsane:amd64 1.0.24-1.1+b1
> from debian testing) has problems with 600 dpi gray and lineart.
> 
> In 600 dpi gray and lineart the scan is partial and aspect-ratio is
> not correct. Vertically only about ? of the area is scanned and then
> scaled to the area, horizontally all is fine. (So probably the driver
> sets the wrong scanline-skip (to small)).
> 
> This worked in older versions, at least 1.0.22.
> 
> 600 dpi Color-scanning works fine, so do preview, 300dpi and 1200 dpi
> in all modes.
> 
> 2400 dpi and 4800 dpi do not work at all, but never did.
> 
> 	MfG
> 	bmg