SUMMARY The ICC color profile I use for my laptop looks wrong on KDE Wayland when compared to KDE X11 (with xcalib) and GNOME Wayland. The screen looks to be tinted red and is most noticeable looking at black colors. STEPS TO REPRODUCE 1. Launch a Plasma Wayland session. 2. Open Display Configuration. 3. Set Color profile to ICC profile with an user provided ICC profile. 4. Set Color accuracy to Prefer Accuracy. 5. Apply changes. OBSERVED RESULT The monitor is tinted red which is not very apparent on first glance but can be seen and becomes most noticeable on darker images, especially on pure black backgrounds. EXPECTED RESULT The monitor is calibrated fine like how it is on Plasma X11 (with xcalib) and Gnome Wayland. Pure blacks do not have a red tint. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.4.0 KDE Frameworks Version: 6.15.0 Qt Version: 6.9.1 Kernel Version: 6.15.2-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz Memory: 16 GiB of RAM (15.5 GiB usable) Graphics Processor 1: Intel® UHD Graphics 630 Graphics Processor 2: NVIDIA GeForce GTX 1050 Ti Manufacturer: ASUSTeK COMPUTER INC. Product Name: Strix 17 GL703GE System Version: 1.0 ADDITIONAL INFORMATION 1. I first noticed this issue when switching to the Plasma 6.0 release. Pre-6.0 Wayland with colord used to color manage properly. 2. Night light is disabled. 3. Red tint becomes less visible (but still exists) when lowering the color resolution to 6 bits per color. 4. Red tint becomes more noticeable when using prefer efficiency. 5. Color intensity works but doesn't remove the tint at any position. EDID information # card0-eDP-1 ####################### Block 0, Base EDID: EDID Structure Version & Revision: 1.4 Vendor & Product Identification: Manufacturer: CMN Model: 5959 Made in: week 16 of 2016 Basic Display Parameters & Features: Digital display Bits per primary color channel: 8 DisplayPort interface Maximum image size: 38 cm x 21 cm Gamma: 2.20 Supported color formats: RGB 4:4:4 First detailed timing includes the native pixel format and preferred refresh rate Color Characteristics: Red : 0.6777, 0.3085 Green: 0.2636, 0.6777 Blue : 0.1513, 0.0595 White: 0.3134, 0.3291 Established Timings I & II: none Standard Timings: none Detailed Timing Descriptors: DTD 1: 1920x1080 120.000000 Hz 16:9 135.840 kHz 305.640000 MHz (381 mm x 214 mm) Hfront 100 Hsync 66 Hback 164 Hpol N Vfront 6 Vsync 10 Vback 36 Vpol N Alphanumeric Data String: 'N173HHE-G32' Alphanumeric Data String: 'CMN' Alphanumeric Data String: 'N173HHE-G32' Checksum: 0x5f ---------------- EDID conformity: PASS
Created attachment 182454 [details] Contains the ICC profile used and a relative comparison taken from a camera with white balance and exposure fixed.
Neither the X11 session nor Gnome Wayland actually apply the full ICC profile, it's up to apps to do that, and the very very vast majority just don't. The pre-6.0 state was *not* color managed, but now it is, and colors are expected to be noticeably different with a wide gamut display like yours. Applying your ICC profile on my laptop, I see that it does cause a yellow-ish tint on my close-to-sRGB display, but looking at the VCGT in the profile, that seems to be about right. It is odd though that you see a noticeable difference between the color accuracy settings, they should be *very* close. Do you have a colorimeter, to run a verification pass with DisplayCal and check what's actually happening? https://zamundaaa.github.io/wayland/2024/07/16/how-to-profile.html explains how to do that correctly on Wayland
(In reply to Zamundaaa from comment #2) > Neither the X11 session nor Gnome Wayland actually apply the full ICC > profile, it's up to apps to do that, and the very very vast majority just > don't. The pre-6.0 state was *not* color managed, but now it is, and colors > are expected to be noticeably different with a wide gamut display like yours. > > Applying your ICC profile on my laptop, I see that it does cause a > yellow-ish tint on my close-to-sRGB display, but looking at the VCGT in the > profile, that seems to be about right. > > It is odd though that you see a noticeable difference between the color > accuracy settings, they should be *very* close. Do you have a colorimeter, > to run a verification pass with DisplayCal and check what's actually > happening? > https://zamundaaa.github.io/wayland/2024/07/16/how-to-profile.html explains > how to do that correctly on Wayland I don't have a Colorimeter, I just used the color profile per-installed from the manufacturer, so I will understand if this can't be pursued any further and its just that there will be just differences. As for color accuracy settings, I did try out a second monitor and swapping between color accuracies and couldn't really notice the same amount of difference as the laptop monitor. I still do notice it on my main monitor but even then its because I am staring into solid color blocks and constantly switching between them so its hard to say. I did try out some random color profiles and noticed some saturation differences but its not possible to absolutely say how *very* close they are.
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.