[sane-devel] Red tint on scans in XSane & Skanlite

[Frederik “Freso” S. Olesen]

Den 17.05.2020 kl. 14.14 skrev Torfinn Ingolfsen:
> On Sun, May 17, 2020 at 11:14 AM Frederik “Freso” S. Olesen
> <freso.dk at gmail.com> wrote:
>>
>> I recently tried to do some scans and noticed they started turning out
>> with a noticeable red tint which they didn’t have previously. You can
>> see some comparisons and my initial explorations into the issue here:
>> https://community.metabrainz.org/t/red-tint-on-scans/476126?u=freso
> 
> This sounds similar to an old libtiff bug, see
> http://bugzilla.maptools.org/show_bug.cgi?id=2150

That does sound like a possible candidate! At the very least, it’s a
venue I didn’t look into yet.

I currently have libtiff 3.9.7 and 4.1.0 installed. /usr/lib/libtiff.so
points to libtiff.so.5.5.0 which should be the 4.1.0 version. My desktop
has the exact same versions though.

> Does the current xsane have options to change what format and / or
> parameters to save the file as?
> If so, try to change  to a different format, in order to see if you
> can narrow down where the bug might be.

I was saving to PNG, but XSane has tons of options for saving in
different formats and tweaking lots of knobs etc. (one of the reasons I
couldn’t switch to something like simple-scan :)).

Let me test a bit with various output…

No additional changes, I get the same red tint saving to TIFF, PNM,
JPEG, PNG, PS, PDF.
I tried to tweak various compression settings and ended up turning
compression off completely (under Settings → File type), but still get
the same tint for both PNG and TIFF scans at least.

Anything else you might be able to suggest I could try?

-- 
Solidarity,
Frederik “Freso” S. Olesen <https://freso.dk/>

Like what I do? Check out <https://www.patreon.com/Freso>!

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