On the other hand, maybe we need to treat disabling the default colour
profile as a workaround.
I forgot to mention that in at least one case I noticed similar problems
in web browsers and image viewers even when using a properly custom
calibrated profile for my display.
So a real fix might have to come in the apps themselves, or maybe just
one or two image decoding libraries that are misinterpreting the profile
data (maybe they don't know or expect the whole compositor is applying
the profile already?). To do this someone would need to dig into the
code of an affected app and see how/where it is using the colour profile
data.
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Touch seeded packages, which is subscribed to colord in Ubuntu.
https://bugs.launchpad.net/bugs/1785764
Title:
Ubuntu default colour profile distorts colours on some machines (white
looks green, too dark, or under-saturated)
Status in colord package in Ubuntu:
Confirmed
Status in gnome-control-center package in Ubuntu:
Confirmed
Bug description:
Using Ubuntu 18.04.1 LTS
Running on an i7-6700k with a GTX 1080
Reproducible with nvidia-driver-396 or xserver-xorg-video-nouveau
and a single 4K screen (TV) connected via HDMI.
The issue:
Any dark content displayed by an effected application (e.g. a very dark image
or dark themed web page) is much darker than intended making it almost
unusable.
This only effects applications that are launched when the 4K screen is
connected. If i disconnect the 4K screen, launch the app via a
different 1080p monitor then reconnect the 4K screen the app remains
unaffected.
The only apps i have found so far that are effected by this are Google
Chrome and Image Viewer. That said this is only noticeable when the
app is displaying dark contend so if other apps are affected it may be
impossible to tell.
The attached screenshot uses a black to white gradient image to clearly
demonstrate the issue.
Is seems like it may be an issue with colour depth as bellow a certain
brightness it just goes strait to black.
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