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Emit an inverse-alpha background plate alongside the cutout in a single inference pass. Same source RGB, alpha = 255 − mask. Dual-encoder pipeline runs in parallel; both outputs share the same --quality preset. This is a hole-cut plate (subject region transparent), not an inpainted clean plate — composite something opaque under it to fill the hole. Docs and skill cover when each is the right tool. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>