https://bugs.kde.org/show_bug.cgi?id=515402
Bug ID: 515402
Summary: Loading an .icc shifts gamma to 2.2
Classification: Plasma
Product: kwin
Version First 6.5.5
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 189146
--> https://bugs.kde.org/attachment.cgi?id=189146&action=edit
icc profile
SUMMARY
I created a .icc/.icm in Windows with DisplayCAL, since on Linux, I'd always
get worse results than in Windows. I then loaded that file "System Settings >
Display Configuration > Color profile > ICC Profile". There is now a noticeable
uplfit in grays and Gamma has shifted to 2.2. For context, my monitor's gamma
is 2.42 as measured with a Colorchecker Display Pro. After profiling, a quick
measurement test reports Gamma 2.40.
This behavior is consistent across both my ASUS OLED and my LG LCD IPS.
Displaycal's "Report on display device":
WINDOWS:
Calibrated:
22:05:58,673 Setting up the instrumentlist_iccss: xdg_bds returned 21
pathslist_iccss: ↲
↳ returning 21 ccss'sProduct Name: i1Display3Serial Number:
↲
↳ C2-22.B-02.022123.08Hardware Rev.: B-02Firmware Version:
v2.28Firmware ↲
↳ Date: 29Jan14Measured display update delay of 3 msec, using
delay of 104 ↲
↳ msec & 0 msec inst reactionNo distict refresh periodCurrent
calibration ↲
↳ response:Black level = 0.0000 cd/m^250% level = 46.30
cd/m^2White level = ↲
↳ 244.40 cd/m^2Aprox. gamma = 2.40Contrast ratio = inf:1White
chromaticity ↲
↳ coordinates 0.3128, 0.3275White Correlated Color Temperature
= 6500K, DE ↲
↳ 2K to locus = 3.1White Correlated Daylight Temperature = 6557K,
DE 2K to ↲
↳ locus = 2.3White Visual Color Temperature = 6405K, DE 2K
to locus = ↲
↳ 3.0White Visual Daylight Temperature = 6627K, DE 2K to locus
= 2.2White ↲
↳ drift was 0.000000 DE
Uncalibrated:
22:06:49,539 Setting up the instrumentlist_iccss: xdg_bds returned 21
pathslist_iccss: ↲
↳ returning 21 ccss'sProduct Name: i1Display3Serial Number:
↲
↳ C2-22.B-02.022123.08Hardware Rev.: B-02Firmware Version:
v2.28Firmware ↲
↳ Date: 29Jan14Measured display update delay of 0 msec, using
delay of 100 ↲
↳ msec & 0 msec inst reactionNo distict refresh periodUncalibrated
↲
↳ response:Black level = 0.0000 cd/m^250% level = 45.85
cd/m^2White level = ↲
↳ 244.67 cd/m^2Aprox. gamma = 2.42Contrast ratio = inf:1White
chromaticity ↲
↳ coordinates 0.3135, 0.3274White Correlated Color Temperature
= 6466K, DE ↲
↳ 2K to locus = 2.6White Correlated Daylight Temperature = 6523K,
DE 2K to ↲
↳ locus = 2.8White Visual Color Temperature = 6389K, DE 2K
to locus = ↲
↳ 2.5White Visual Daylight Temperature = 6611K, DE 2K to locus
= ↲
↳ 2.7Effective Video LUT entry depth seems to be 10 bitsWhite
drift was ↲
↳ 0.000000 DE
Linux:
21:59:09,495 Setting up the instrumentlist_iccss: xdg_bds returned 18
pathslist_iccss: ↲
↳ returning 18 ccss'sProduct Name: i1Display3Serial Number:
↲
↳ C2-22.B-02.022123.08Hardware Rev.: B-02Firmware Version:
v2.28Firmware ↲
↳ Date: 29Jan14Measured display update delay of 13 msec, using
delay of ↲
↳ 117 msec & 0 msec inst reactionNo distict refresh
periodUncalibrated ↲
↳ response:Black level = 0.0000 cd/m^250% level = 53.34
cd/m^2White level = ↲
↳ 242.62 cd/m^2Aprox. gamma = 2.19Contrast ratio = inf:1White
chromaticity ↲
↳ coordinates 0.3132, 0.3274White Correlated Color Temperature
= 6481K, DE ↲
↳ 2K to locus = 2.8White Correlated Daylight Temperature = 6539K,
DE 2K to ↲
↳ locus = 2.6White Visual Color Temperature = 6397K, DE 2K
to locus = ↲
↳ 2.7White Visual Daylight Temperature = 6619K, DE 2K to locus
= ↲
↳ 2.5Effective Video LUT entry depth seems to be 8 bitsWhite drift
was ↲
↳ 0.000000 DE
STEPS TO REPRODUCE
1. Use a .icc with 2.4 Gamma
2. Load it
OBSERVED RESULT
Gamma shifts to 2.2
EXPECTED RESULT
The .icc is loaded correctly and does not apply a 2.2 Gamma.
Operating System: CachyOS Linux
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.2
Kernel Version: 6.18.8-1-cachymod-lto (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 3070
Graphics Processor 2: NVIDIA GeForce RTX 5070 Ti
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