Windows 11 Auto HDR is broken

[Windows 11]

Windows Auto HDR is using the wrong Gamma Curve and it's ruining blacks. Auto HDR (actually Windows Advanced Color in general) uses what the spec says is the correct gamma curve. The problem is nobody actually used that for real monitors. Effectively, Windows has had a de jure transfer curve (sRGB Piecewise) and a different de facto transfer curve (Pure Power 2.2) for decades. Nobody bothered to enforce sRGB Piecewise and nobody authored content for it either. Then when MS made HDR/Advanced Color, they made a highly dubious decision to treat all untagged SDR material as sRGB, including the pie

Continue reading...