Hi,
I would have opened this as a bug report, but
http://www.darktable.org/redmine/ seems not to work at the moment. Anyway:
I'm running darktable 1.6.6 on LinuxMint (pmjdebruijn-ppas). I've got a
setup with two screens (Fujitsu P24-5 ECO (LCD/IPS, CCFL backlight) and
DELL U2412M (LCD/IPS, LED backlight)). I've calibrated those screens
with my Colormunki Display (dispcalGUI, 6500K, 140cdm²).
Using darktable I noticed that the Fujitsu screen seemed quite a bit off
with a red-ish tint.
This behaviour goes away when switching the method to find the CMS from
'all' (or XAtom) to Colord. => When I force Colord all is fine, with
XAtom the colors are off.
Running darktable-cmstest gives me
-------8<--------------------------------------------------
darktable-cmstest version 1.6.6
this executable was built with colord support enabled
darktable itself was built with colord support enabled
HDMI1 the X atom and colord returned the same profile
X atom: _ICC_PROFILE (28328 bytes)
description: P24W-5 ECO 2015-05-01 140cdm^2 D6500 2.2 S
3xCurve+MTX
custom89,90,100 br44c50b0 2015-05-01 Tiefenkomp Korr Eizo
colord: "/home/jnf/.local/share/icc/P24W-5 ECO 2015-05-01 140cdm² D6500
2.2 S 3xCurve+MTX custom89,90,100 br44c50b0 2015-05-01 Tiefenkomp Korr
Eizo.icc"
description: P24W-5 ECO 2015-05-01 140cdm^2 D6500 2.2 S
3xCurve+MTX
custom89,90,100 br44c50b0 2015-05-01 Tiefenkomp Korr Eizo
HDMI2 the X atom and colord returned the same profile
X atom: _ICC_PROFILE_1 (29268 bytes)
description: U2412M 2015-05-02 140cdm^2 D6500 2.2 S 3xCurve+MTX
custom97,94,97 br38c75 2015-05-01 Tiefenkomp Korr Dell
colord: "/home/jnf/.local/share/icc/U2412M 2015-05-02 140cdm² D6500 2.2
S 3xCurve+MTX custom97,94,97 br38c75 2015-05-01 Tiefenkomp Korr Dell.icc"
description: U2412M 2015-05-02 140cdm^2 D6500 2.2 S 3xCurve+MTX
custom97,94,97 br38c75 2015-05-01 Tiefenkomp Korr Dell
Your system seems to be correctly configured
------->8--------------------------------------------------
Now, I'd expect that either my system is mis-configured which should
show in the darktable-cmstest or that the colors in XAtom mode should
match between screens as they do in Colord mode.
From what I can tell from delays when moving darktable between screens,
the XAtom case looks like a necessary correction of the red levels is
tried, but with the opposite sign, essentially doubling the visual
error instead of removing it *or* mixing up the two screens. But this is
only guesswork.
I've got two logs (darktable -d all with XAtom mode and with Colord
mode) that are 0.5M together, so I don't want to post them here, but I
can send them to anyone interested directly.
If there is any further information that I should provide, I'd happily
do that as well.
If you want a bit of context what I tried before (all essential
informations should be included above):
http://photo.stackexchange.com/questions/61721/how-do-i-calibrate-two-displays-to-the-same-color-lcd-led-backlight-and-ccfl/
http://sourceforge.net/p/dispcalgui/mailman/dispcalgui-users/thread/5543A8B9.5040406%40Fingerle.org/
Cheers,
Jan Niklas
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