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SimulPiscator / AirSane

Publish SANE scanners to MacOS, Android, and Windows via Apple AirScan.
GNU General Public License v3.0
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continuous scans show up vertically compressed #113

Closed mo-pyy closed 10 months ago

mo-pyy commented 10 months ago

When scanning multiple pages using gnome document scanner, the pages go vertically compressed. See this example pdf: malformed_airsane_scan.pdf

When scanning using scanimage from the server running AirSane, this does not happen and when running it from a remote device using airscan sane backend, it does happen, so if I understand it correctly it should be related to AirSane.

AirSane is compiled from the latest master, commit 918fd7bf76dada4e534b91558a51f486cf209879.

SimulPiscator commented 10 months ago

If you use AirSane's web interface and choose "PDF" as format, and "Feeder" as source, does the same problem occur?

SimulPiscator commented 10 months ago

You might try the latest version from git. It has been changed to improve behavior with Automatic Document Feeders.

mo-pyy commented 10 months ago

Thanks for your answer. I just updated to the latest version from git. Actually I don't have an ADF, I was simply scanning multiple times. In the web interface, I have selected 'Platen', it's the only available input source. I could not reproduce the error in the web interface. But I could reproduce it again using the gnome scanner. I noticed, that just a part of the document gets compressed, see here malformed_airsaned_scan_v2.pdf I probably put the paper in the other way around. Do you think it could be a sane driver fault? Journalctl show this error multiple times while scanning:

io/hpmud/dot4.c 120: unexpected DOT4CreditRequest: cmd=4, hid=4, pid=4, maxcredit=65535
mo-pyy commented 10 months ago

I just scanned again on the server using scanimage and now the first page also was affected, but the following 5 weren't. Maybe this isn't AirSane related

SimulPiscator commented 10 months ago

Maybe this isn't AirSane related

No irregularities show up when testing AirSane with SANE's "test" backend, or my physical scanner, a Canon LiDE 60.

mo-pyy commented 10 months ago

Okay thanks, then I am closing this for now.