Am Mo., 29. Dez. 2025 um 19:53 Uhr schrieb Shengyu Qu <[email protected]>: > > The curves supported by Gamma are: > > * scRGB > > * BT.709 > > * BT.2020 > > * HLG > > > > Given the lack of support for writeback connectors on the MediaTek KMS > > driver, combined with limited hardware documentation, I haven't been > > able to verify the correctness of each curve, only that they were > > visually sane (gamma curves made the image on the display brighter, > > while inverse gamma made it darker). > > Hmmm I don't think this is acceptable. sRGB/scRGB has two transfer > functions mentioned in original specification[1]. To keep color > accuracy, we need someone from mediatek confirm whether this is > piece-wise or pure power 2.2 transfer function, this is already done in > original amdgpu color pipeline series, sRGB means piece-wise while also > dedicated power 2.2 function exists. scRGB is a different specification from sRGB and has only piece-wise and linear, not power 2.2. I seems unlikely that there's really a problem here.
- Xaver
