Public bug reported:
I have a Brother MFC-L2710DW printer with integrated flatbed scanner.
There are two major problems when scanning with sane:
The first problem is that the quality of all scanned images is very poor
due to 8x8 pixel JPG compression artefacts. The root coarse seems to be
the backend, as the result is the same independently if the image is
acquired through xsane or scanimage.
The second problem is that sane only scans up to 300 dpi. 1200 dpi is
not offered at all and for 600 dpi the error message "Failed to start
scanner: Invalid argument" is displayed. Interestingly the message is
displayed after the scanner has completed the scan, but the data seems
not to be received or understood by sane.
The scanner works fine in Ubuntu with the commercial software vuescan,
which rules out a firmware bug or malfunctioning of the scanner itself.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libsane 1.0.29-0ubuntu5.2
ProcVersionSignature: Ubuntu 5.11.0-16.17~20.04.5-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 21 23:00:21 2021
InstallationDate: Installed on 2015-11-05 (2116 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: sane-backends
UpgradeStatus: Upgraded to focal on 2020-09-10 (345 days ago)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2019-03-07T14:28:39.455024
** Affects: sane-backends (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal third-party-packages
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https://bugs.launchpad.net/bugs/1940754
Title:
All scans via sane deteriotad by compression artefacts for Brother
MFC-L2710DW
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