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Harald HoyerandClaude Opus 5.5
987d14b6ad
A sunny ILCE-7M4 waterfall shot rendered yellow: sunlit rock came out cream, +4 b* in the brightest fifth of the picture. Camera JPEGs make shadows up to 1.4x more colourful and bleach highlights to 0.1-0.3x (a per-channel tone curve), which a luminance-only curve can't do. - CameraTone gains an 8-node chroma-by-display-luminance curve, fitted per file (bright pixels included) and kept only when it lowers the held-out error; applied after the tone map on CPU and GPU, keeping luminance. Old smart-preview headers load with an identity curve. - The hue/saturation table gets an sRGB-encoded value axis: dark yellows had to turn toward orange while bright yellow-greens turned toward green. It is applied after the baseline exposure, as it is fitted. - Matrix-only and matrix+table looks are completed (tone, chroma) and compared in gamma-encoded values; acceptance gates stay linear. 29 local ARWs vs their camera JPEGs: mean dE 4.23 -> 3.54, every file closer, saturated areas 7.65 -> 6.41. Render cache v10. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>