nx_garment_lib.nx

nx_garment_lib.nx -- SPATIALLY-COHERENT GARMENT MASK: replaces the rectangle that left a visible seam. THE MEASURED PROBLEM. A hue-only mask for a yellow dress also caught the model's FACE, because skin and warm fabric are genuinely close in hue -- so no hue tolerance can separate them without either losing the dress or taking the face. A rectangle "fixed" it only by brute force, and left a seam. THE PRINCIPLED SEPARATOR IS SPATIAL COHERENCE, NOT A TIGHTER THRESHOLD. A garment is ONE LARGE CONTIGUOUS REGION. Skin is a different region that merely resembles it in colour. So: build the colour-candidate set, label 8-connected components, and keep the LARGEST -- the dress survives, the face falls away as a separate component, and the boundary follows the actual fabric edge instead of an invented rectangle. No tuned constant decides which is which; the geometry does. Composes nx_img_segment's proven flood-fill labeller (ink=0/paper=255 convention) -- zero new component-labelling maths -- and nx_editjudge_lib's hue/sat primitives, so ONE definition of "this pixel is that colour" governs the candidate set here and the judging elsewhere. license_tier: ORIGINAL