[sane-devel] Canon LiDE 20 vertical lines

[Udo Lütkemeier]

Hello,

i have bought a new Canon LiDE 20.
I have me decide for these Scanner, because these is list on the website
from the sane-project with status "complete". Also have another LiDE 20
user from the ELUG(Essener Linux User Group) send me demo-scans.
These scans have also a good quality.

Yesterday, i have install the Scanner on Debian etch(testing) with
follow sane version:

$ scanimage --version
scanimage (sane-backends) 1.0.15; backend version 1.0.15

The Scanner runs also, only the quality is under Linux bad.
The pictures have dark vertical lines through the scans. :-(

I have make test scans, that you can see these vertical lines. Please
follow the links to the testscans below.

The lines are not on the glass plate of the scanner and not on the 
original photos.

Yesterday, i have try adjust the settings in xsane. These adjust was of
no avail. :-(

Now, i have these scanner install on windows. There are no vertical
lines in the scans. See the links to my testscans below.

I have yesterday also tested the latest snapshot of sane-backends. With
these, there was the same dark vertical lines.

How can I remove the dark vertical lines in the scans on linux?

Why are these lines not at the demo-scans of the other LiDE 20 user 
from the ELUG on Linux?

Where do the dark vertical lines come from and why are they not on
windows?

Testscans(please zoom in, that you can better see the lines):

- Testscans with dark vertical lines on Linux:

  http://www.udo-luetkemeier.de/temp/Schnee-Linux.jpg
  http://www.udo-luetkemeier.de/temp/Berge-Linux.jpg

- Testscans without dark vertical lines on Windows:

  http://www.udo-luetkemeier.de/temp/Schnee-Win.jpg
  http://www.udo-luetkemeier.de/temp/Berge-Win.jpg

- Testscan without dark vertical lines from another LiDE 20 user from 
  the ELUG on Linux:

  http://www.udo-luetkemeier.de/temp/out0003.jpg

System information:

OS: Debian GNU/Linux etch(testing)
CPU: Intel P4 2.8 GHz
RAM: 1024 MB

$ uname -r
2.6.8-2-686-smp

sane version:
$ scanimage --version
scanimage (sane-backends) 1.0.15; backend version 1.0.15

Scanner:
$ scanimage -L
device `plustek:libusb:005:008' is a Canon N670U/N676U/LiDE20 USB
flatbed scanner

$ sane-find-scanner
[...]
found USB scanner (vendor=0x04a9 [Canon], product=0x220d [CanoScan],
chip=LM9832/3) at libusb:005:008
[...]

With best regards,

Udo Lütkemeier

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Udo Lütkemeier			       http://www.udo-luetkemeier.de
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