https://bugs.kde.org/show_bug.cgi?id=514768
--- Comment #2 from [email protected] --- (In reply to Zamundaaa from comment #1) > > the fix is generally to load the official srgb default icc profile you can > > download from the internet. > "sRGB" ICC profiles don't actually describe sRGB screens (as dumb as that > sounds). What "sRGB" ICC profiles effectively do is reduce the brightness of > dark colors. > There's a good chance the blocky blacks are just color banding that is > present in many videos, and the "sRGB" ICC profile ends up hiding it. Or > your screen is a bit different from a 'correct' sRGB screen, there's a few > possibilities for how this could happen. > > Please provide > - some example video in which you see the issue > - a photo of the problem on your screen (take it with your phone), so we're > on the same page about what the problem looks like exactly > - the output of kscreen-doctor -o > - the EDID of your screen. You can find it in the info center app. Just copy > it to a file and attach it here yes the problem is color banding. pure blacks make very dark blob or glitches on the screen and you are right the icc profile make blacks less noticeable from other colors. i have the issue in 2 different screens , a dell s3222dgm and a samsung 7 series -43- -UE43TU7025KXXC HDR note: the problem is not present on windows or on android boxes. here the edid # card1-DP-3 ####################### Block 0, Base EDID: EDID Structure Version & Revision: 1.4 Vendor & Product Identification: Manufacturer: DEL Model: 53519 Serial Number: 810310230 (0x304c5a56) Made in: week 23 of 2021 Basic Display Parameters & Features: Digital display Bits per primary color channel: 8 DisplayPort interface Maximum image size: 70 cm x 40 cm Gamma: 2.20 DPMS levels: Standby Suspend Off Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2 First detailed timing includes the native pixel format and preferred refresh rate Display supports continuous frequencies Color Characteristics: Red : 0.6601, 0.3261 Green: 0.2656, 0.5791 Blue : 0.1376, 0.1123 White: 0.3017, 0.3535 Established Timings I & II: IBM : 720x400 70.081663 Hz 9:5 31.467 kHz 28.320000 MHz DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz DMT 0x06: 640x480 75.000000 Hz 4:3 37.500 kHz 31.500000 MHz DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz DMT 0x0b: 800x600 75.000000 Hz 4:3 46.875 kHz 49.500000 MHz DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz DMT 0x12: 1024x768 75.028582 Hz 4:3 60.023 kHz 78.750000 MHz DMT 0x24: 1280x1024 75.024675 Hz 5:4 79.976 kHz 135.000000 MHz Standard Timings: DMT 0x53: 1600x900 60.000000 Hz 16:9 60.000 kHz 108.000000 MHz (RB) DMT 0x3a: 1680x1050 59.954250 Hz 16:10 65.290 kHz 146.250000 MHz DMT 0x45: 1920x1200 59.884600 Hz 16:10 74.556 kHz 193.250000 MHz DMT 0x15: 1152x864 75.000000 Hz 4:3 67.500 kHz 108.000000 MHz DMT 0x33: 1600x1200 60.000000 Hz 4:3 75.000 kHz 162.000000 MHz DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz Detailed Timing Descriptors: DTD 1: 2560x1440 59.950550 Hz 16:9 88.787 kHz 241.500000 MHz (697 mm x 392 mm) Hfront 48 Hsync 32 Hback 80 Hpol P Vfront 3 Vsync 5 Vback 33 Vpol N Display Product Serial Number: '4RTJT63' Display Product Name: 'DELL S3222DGM' Display Range Limits: Monitor ranges (Range Limits Only): 48-165 Hz V, 250-250 kHz H, max dotclock 650 MHz Extension blocks: 1 Checksum: 0x76 ---------------- Block 1, CTA-861 Extension Block: Revision: 3 Underscans IT Video Formats by default Basic audio support Supports YCbCr 4:4:4 Supports YCbCr 4:2:2 Native detailed modes: 1 Video Data Block: VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (native) VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz VIC 2: 720x480 59.940060 Hz 4:3 31.469 kHz 27.000000 MHz VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz VIC 17: 720x576 50.000000 Hz 4:3 31.250 kHz 27.000000 MHz VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz VIC 63: 1920x1080 120.000000 Hz 16:9 135.000 kHz 297.000000 MHz Audio Data Block: Linear PCM: Max channels: 2 Supported sample rates (kHz): 48 44.1 32 Supported sample sizes (bits): 24 20 16 Speaker Allocation Data Block: FL/FR - Front Left/Right Detailed Timing Descriptors: DTD 2: 1920x1080 143.855701 Hz 16:9 162.269 kHz 337.520000 MHz (697 mm x 392 mm) Hfront 48 Hsync 32 Hback 80 Hpol P Vfront 3 Vsync 5 Vback 40 Vpol N DTD 3: 1920x1080 164.997447 Hz 16:9 186.447 kHz 387.810000 MHz (697 mm x 392 mm) Hfront 48 Hsync 32 Hback 80 Hpol P Vfront 3 Vsync 10 Vback 37 Vpol N DTD 4: 2560x1440 119.997589 Hz 16:9 182.996 kHz 497.750000 MHz (697 mm x 392 mm) Hfront 48 Hsync 32 Hback 80 Hpol P Vfront 3 Vsync 5 Vback 77 Vpol N DTD 5: 2560x1440 143.911545 Hz 16:9 222.056 kHz 592.000000 MHz (697 mm x 392 mm) Hfront 8 Hsync 32 Hback 66 Hpol P Vfront 25 Vsync 8 Vback 70 Vpol N DTD 6: 2560x1440 165.079853 Hz 16:9 244.318 kHz 645.000000 MHz (697 mm x 392 mm) Hfront 8 Hsync 32 Hback 40 Hpol P Vfront 6 Vsync 8 Vback 26 Vpol N Checksum: 0xfa ---------------- EDID conformity: PASS -- You are receiving this mail because: You are watching all bug changes.
