Not possible to scan without ugly JPEG artifacts even in png format on GNU-Linux

[dmucho]

HP DeskJet Ink 3835 (and probably any other HP DeskJet scanner or any other HP scanner at all) is not able to scan without JPEG ugly artifacts in GNU/Linux.

Even if users selects PNG or any other lossless format - the actual image is disturbed with JPEG-type compression on driver's level.

It happens in any GNU/Linux distribution. Maybe there is not such issue on Windows? I don't know, you tell me.

So, in 2021 it is insane that HP does not allow to scan an image without software artifacts and image distortions that are easily noticeable with a naked eye, especially on printed text.
Dear developers of HP please spend some time to allow users to get what they paid for - simply scanning images without artifacts.

HP is rather open to GNU/Linux and I hope it will continue by fixing this issue that exists for many years. The internet is full of complains on exactly this problem since at least 2013.

[dmucho (vleett)]

Related issue that was not fixed upstream for 7 years: #1245578

Bug #1245578 “cannot disable JPEG compression when scanning” : Bugs : HPLIP
https://bugs.launchpad.net/hplip/+bug/1245578

[Johnny Nielsen (johnny1000)]

Still a problem.
Arch Linux + HPLIP 3.22.10
Photosmart 5520
Photosmart 6520

At this point in time HPLIP does not include a quality settings value (gone ages ago), changing the .drc file does nothing (it's overwritten with the JPEG setting), xsane advanced settings includes only JPEG compression (no "none" option), and hp-scan --compression=none reports "error: Unable to set option compression to value None"

A patch was posted 2015-02-28:
https://bugs.launchpad.net/hplip/+bug/1245578/+attachment/4330834/+files/hpscan-final.patch

@HP: Please apply upstream.