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curve.refineSaturation (0..100, default 100 = the curve's own saturation): after the tone curves, the chroma around luma is rescaled so saturation moves from the curve's towards the pre-curve value, keeping the curve's tone. CPU (finish::refine_saturation) and GPU twin, equivalence case, slider under the curve editor, crs:CurveRefineSaturation import. Co-Authored-By: Claude Opus 5.5 <[email protected]>