v1.3.0 — Mask Post-Processing & Color Decontamination

What's New

Mask Post-Processing Pipeline

Added a research-backed post-processing pipeline for segmentation masks that follows BRIA's official recommendations:

• Min-max alpha normalization — preserves the model's soft alpha matte while using the full 0-255 dynamic range (replaces destructive sigmoid thresholding)
• Morphological opening (erode + dilate) — removes edge noise without permanently shrinking the mask boundary
• Gaussian blur — smooth anti-aliased edges at mask boundaries

Color Decontamination

Added Photoshop-style "Decontaminate Colors" at compositing time:

• Propagates clean foreground RGB into semi-transparent edge pixels
• Eliminates background color fringe (e.g. green/blue spill from colored backgrounds)
• Runs automatically at render time so brush tool edits are always decontaminated

Files Changed

• src/lib/maskPostProcessing.ts (new) — post-processing algorithms + color decontamination
• src/lib/segmentation.ts — integrated mask post-processing into rawImageToCanvas()
• src/lib/compositing.ts — integrated color decontamination into drawMaskedForeground()