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Auto Mask strokes weight each dab by similarity (log luminance + chromaticity) to the pixel under its centre and are refined by a cross guided filter on log luminance (max-combined, never removing paint). Local Noise smooths small-amplitude luminance detail (negative boosts it) and calms colour noise; Moiré blends chromaticity towards a blurred plane (appended to the GPU mask buffer); Defringe desaturates purple/green casts on edges. Pixel tests per slider and for the edge constraint, CPU/GPU equivalence cases, Auto Mask checkbox and Moiré/Defringe sliders in the panel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>