https://bugs.kde.org/show_bug.cgi?id=496388
Bug ID: 496388
Summary: The image->monitor color conversion doesn't update
with flag changes.
Classification: Applications
Product: krita
Version: nightly build (please specify the git hash!)
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: griffinval...@gmail.com
Target Milestone: ---
SUMMARY
After some experimentation here
(https://krita-artists.org/t/soft-proofing-doesnt-match-converted-image/104157/37),
I realized that Krita only updates the monitor color transform after the
monitor profile has been changed, but not for intent or any of the flags (lcms
optimisation or blackpoint compensation).
>From some basic debugging, the issue is that KisCanvas2::slotConfigChanged()
calls KisCanvas2::slotScreenChanged which calls
KisCanvas2::setDisplayProfile(const KoColorProfile *monitorProfile) and
eventually that sets the profile on
isDisplayColorConverter::setMonitorProfile(const KoColorProfile
*monitorProfile), which also updates all the extra options. However, if the
profile didn't change, this last function is never called.
STEPS TO REPRODUCE
1. Convert any given image (with black sections) to CMYK.
2. Switch off (or on) blackpoint compensation in settings->color management.
3. Observe canvas.
4. Change monitor profile in settings->color management.
Turning on or off blackpoint compensation should change whether or not CMYK
black is adjusted for or not (CMYK is usually not as black as a monitor, and
the profile usually simulates this... blackpoint compensation maps the blacks
of two color spaces), so the blacks should change when BP compensation is
changed.
OBSERVED RESULT
Blackpoint compensation changes are only in effect when the monitor profile
changes.
EXPECTED RESULT
Blackpoint compensation should take effect even when the monitor profile
doesn't change.
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