Further investigation of my backups shows that I never had a "jpeg-quality"
setting in GNOME settings on this machine before
("HOME=/path/to/restored/homedir dconf dump /org/gnome/simple-scan/").
I do have jpeg-quality=75 on the old machine that was connected to the scanner
until 5 years ago...
TL;DR: Apparently the compression setting was set to the minimum value.
Changing that fixed the problem.
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Investigation log:
1. Pointing LD_LIBRARY_PATH to a restored backup of /usr/lib/x86_64-linux-gnu
does not help.
2. "strace -f" shows no external programs are called to handle
I have just discovered a few good PDF image documents scanned with simple-scan
42.00 on January 22. So the regression was not introduced by the upgrade from
20.04LTS to 22.04LTS, but after that.
I will have a deeper look at the changes in /var/log/dpkg.log.* later...
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"journalctl -f" does show some messages, but there is not really any
difference depending on the selected file format.
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https://bugs.launchpad.net/bugs/2024887
Title:
** Attachment added: "Bad JPEG document"
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/2024887/+attachment/5683264/+files/Scanned%20Document.jpg
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** Attachment added: "Good PNG document"
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/2024887/+attachment/5683265/+files/Scanned%20Document.png
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** Attachment added: "Bad PDF document"
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/2024887/+attachment/5683263/+files/Scanned%20Document.pdf
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Thank you for your bug report. Could you add a screenshot showing the
issue?
Is there any message printed in the
$ journalctl -f
log when having the issue?
As a workaround you can use png and then use the image viewer to save
back as jpg or print to pdf
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I debuild 44.0-0ubuntu1 from lunar, and that has the same issue.
> Version 3.36.3-0ubuntu0.20.04.0 did not have this problem.
That was when still running 20.04LTS.
When installing 3.36.3-0ubuntu0.20.04.0 (and its
libwebp6_0.6.1-2ubuntu0.20.04.2_amd64.deb dependency) from focal on 22.04.2
LTS,
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