nx_recolor.nx

nx_recolor.nx -- DETERMINISTIC MASKED RECOLOUR: a real colour-edit channel, no GPU, no re-roll. WHY. The GPU img2img loop could not perform a colour edit at all -- denoise strength preserves or destroys, it does not steer an attribute (MEASURED: the dress stayed yellow at every denoise, edit compliance 2 permil). For the specific, common case "make the garment a different colour", a diffusion re-roll is the wrong tool: it is slow, non-deterministic, and it moves identity/pose/lighting you did NOT ask to touch. A masked hue rotation is the right tool -- it changes ONLY the hue of the pixels that were the target colour, keeps their saturation and value, and leaves every other pixel byte-identical. So it preserves identity/pose/lighting BY CONSTRUCTION and scores maximally on BOTH judges at once, which the diffusion loop provably could not. This is the honest scope line: it recolours, it does not add structure (no sequins, no new folds). For pure colour edits it is exact and free; for structural edits the inpaint/ControlNet channels remain. Integer HSV throughout (never-brick #26). Reuses the judge's hue/sat/decoder so one definition of "this pixel is that colour" governs both the edit and the judgement of the edit. license_tier: ORIGINAL