*** This bug is a duplicate of bug 1731459 ***
https://bugs.launchpad.net/bugs/1731459
Nope, there is only one model with one chip one the market. The chip is
also identical to the CanoScan LiDE 100. (See Screenshot attached.)
Please note that this bug is a duplicate of this bug #1731459
(https://bugs.launchpad.net/bugs/1731459) since all GL847 chip bases
scanners are affected by this bug. It would be great if you could repost
your findings in the main bug report since it is VERY interesting that
you have different results with two devices of the same model and also
with the more recent git-version of 1.0.27.
** Attachment added: "CanoScan 100/200 Chipset"
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1729077/+attachment/5032189/+files/Selection_234.png
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https://bugs.launchpad.net/bugs/1729077
Title:
wrong color of horizontally centered area of scan with CanoScan Lide
200
Status in sane-backends package in Ubuntu:
Confirmed
Bug description:
This problem is 100% reproducable, also across reboots.
On a Ubuntu 16.04 and 17.04 and Windows7 system the Scanner CanoScan
Lide 200 works still completely fine.
Problem with Ubuntu 17.10 :
In a horizontally centered zone of about 1 centimeter width of the scan
surface, over the full height of the surface, estimated 90% of the pixel values
are completely wrong.
The distribution of the wrong pixels in this zone appears random.
With lineart and gray scan, the wrong pixels are black. With color scan, the
wrong pixels are black or similar to red. The other pixels in the zone are a
bit too bright. The effect is the same at all resolutions. See attached example
snippets. The effect would continue vertically over the entire scan surface.
The original was uniformly colored.
The scanner worked again with Ubuntu 17.10 after purging sane-
utils,libsane1,libsane-common (by overriding dependency-errors) and
installing libsane-common_1.0.25+git20150528-1ubuntu4_all.deb
libsane_1.0.25+git20150528-1ubuntu4_amd64.deb sane-
utils_1.0.25+git20150528-1ubuntu4_amd64.deb (again by overriding
dependency-errors) (and maybe re-plug scanner / reboot)
Trying these versions had the same problem as default Ubuntu 17.10:
archive.ubuntu.com : 1.0.27-1~experimental2ubuntu2.1,
launchpad.net/~rolfbensch/+archive/ubuntu/sane-git : 1.0.27+git20171012-artful0
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: libsane1 1.0.27-1~experimental2ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Oct 31 20:48:39 2017
InstallationDate: Installed on 2015-12-31 (670 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)
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