The problems has disappeared. xsane and scanimage work fine now: - The xsane gui offers scan resolutions up to 9600 dpi - No compression artefacts, tested with 1200 dpi - No error messages are displayed by xsane
The reason is a mystery, neither any sane nor brscan related packages seem to have been updated in the meantime, but the options xsane offers and how it behaves are clearly different. I can't remember having touched any scanner related configuration since then. However, even though there is only one device, which is connected via WLAN, xsane offers me two "devices" upon startup: Brother *b20210821 MFC-L2710DW [brother4:net1;dev0] and ESCL Brother MFC-L271 flatbed scanner [escl:http://192.168.178.26:80] With the first "device", "Brother *b20210821", scanning works fine, with the second device "ESCL Brother MFC-L271", the old problems occur. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to sane-backends in Ubuntu. https://bugs.launchpad.net/bugs/1940754 Title: Scanned images are deteriorated by compression artifacts with Brother MFC-L2710DW Status in sane-backends package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1940754/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
