Firefox rendition in Manjaro vs Windows -- gamma difference, or what?

Software darktable
1

Hi, all,

Normally, I use darktable and Manjaro Linux
to develop my shots the way I like them (of course!!!).

I was rather proud of an in-the-middle-of-the-night shot,
which I developed on the dark side. But when my forum
friend across the pond ( ping @Eigil_Skovgaard )
looked at it, it came out much lighter.

  • He uses Firefox/Windows.
  • I use Firefox/Manjaro.

I opened my mail myself, switched to Firefox/Windows
and could see the same transformation as he did.

In my case the parameters have not changed much:
same monitor, samt gfx… So why does Firefox
show jpgs much lighter in Win than in Manjaro?
Both my Firefoxes are colour managed.

Wonderlingly Yours,
Claes in Lund, Sweden

1 Like
2

I am waiting for an expert opinion too. This is an interesting problem.

3

what colour profile did you use for the jepgs?

would be interesting to see the jpeg too if possible - i dual boot windows and kubuntu :wink:

4

But are you using the same color and monitor profile for both? (and are you using X or Wayland on Manjaro?)

5

Hi @Egocentrix ,
Yes, same col profile,
and X for Manjaro.

6

Let’s try to narrow it down.

  • Can you provide the jpeg in question, or even the raw and xmp files?
  • Is there a difference between different browsers or photo viewers on different platforms?
  • Have you tried exporting from darktable (same version obviously) on Windows?
  • Which one is ‘correct’, that is, looks the same as in the dt editor?
7

I assume you have already checked this, but just to be sure, if you type in about:config into your firefox address bar, and type color_management into the search bar, do they return the same values for each row?

8

@Soupy Good idea – but unfortunately (in this case), both are
set to the same values :frowning:

1 Like
9

Have you tried with other browsers? E.g. Chrome/Chromium on Linux and Windows? Colour managed image viewers on both systems? Is there a pattern?

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10

@kofa No, I have not.
The dilemma is: if I develop an image the way I like it on Linux/firefox,
I can never be sure how it will look on other peoples’ monitors :frowning:

11

Agreed with @Egocentrix , we need the answers to all questions to narrow down the issue.

1 Like
12

Folks, @Claes is a tricky one. Shows a mystery but doesn’t lift the curtain until later.

13

But that will always be the case: how many do profile their monitors, or
even bother to optimise the settings on their monitors?

There still is something funny going on, which might be worthwhile to investigate.

I do have the option to change the rendering under linux through a system interface
(changing global gamma, and for R, G, B channels, even something called “Night Colour”).
And those have nothing to do with the color management system using profiles.
I assume windows has similar options…

14

Which desktop environment are you running in Manjaro? Perhaps there is an issue with colour management in that desktop environment?

15

@Brian_Innes It’s Gnome.

1 Like
16

I thought you were a KDE man :wink:

When you exported the jpg from dartkable, which colour space did you export it as? srgb?

17

Sounds more like a bug in the desktop environment or drivers.
Remember that a display color profile consists of video card gamma tables / curves and a LUT/matrix/shaper part. A portion gets loaded into hardware, the rest is up to software.

So a driver issue could mess up the gamma tables. Never heard of it before, but could be possible.

Also, a possibility: The Manjaro environment is expecting the programs to NOT do color-management, and handles it itself (sort of like MacOS). By enabling the color-management in Firefox, the profile ‘gets applied twice’.

And maybe - just thinking out load - the profile is a v4 profile that might not be properly supported in one of the environments.

All sound a bit unlikely to be honest. But clearly something is wrong in the system. I have very little experience in Linux color-management to pinpoint possible problems in the configuration of the distro.

Do you know of the same problem on Arch or other Arch-based distro’s? Seems like an easy fix to ‘not use Manjaro’ then, but that’s just my 2cts.