Mask

The mask category is the pack's largest finishing domain. It starts with mask cleanup and extends all the way to trimap generation, closed-form alpha matting, and edge-aware smoothing for production composites.

• N-02 Sub-Pixel Mask Refiner — Converts hard masks into feathered alpha masks with protected inside and outside cores.
• N-04 High-Frequency Detail Masker — Builds binary detail masks from image high-frequency energy.
• N-05 Luminosity Masking — Produces tonal masks for shadows, midtones, and highlights.
• N-28 Edge-Aware Mask Refiner — Refines a mask against an image guide so edges follow subject detail.
• N-29 Alpha Matte Extractor — Solves a Levin 2008 closed-form matte from a trimap and guide image.
• N-30 Trimap Builder — Expands binary masks into strict 0.0 / 0.5 / 1.0 trimaps.
• N-31 Mask Morphology — Runs elliptical-kernel dilate, erode, open, close, and related morphology ops.
• N-32 Mask Combine — Performs add, subtract, union, intersect, xor, difference, and multiply blends.
• N-33 Mask Edge Smoother — Smooths mask edges with bilateral filtering and optional image guidance.
• N-35 Skin Tone Tri-Region — Cross-category face node that outputs three tonal masks for portrait retouching.

Flagship mask pages: N-29 Alpha Matte Extractor and N-33 Mask Edge Smoother.