[#53,#51] Region-based bg segmentation: fix solid-bg holes + --background <color>#55
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…--background <color> Extract a shared _edge_flood_fill_mask() in preprocess.py and use it for both remove_background() and solid_background(), so the subject is defined by connectivity (enclosed by its outline), not color. A subject region that shares the background color — a pink dog-ear on a pink wall — is no longer absorbed into the repainted background (no more see-through holes). Add --background <color>: repaint the detected background to a chosen color (hex or named via PIL.ImageColor); --solid-background == --background auto. Backward-compatible, threaded through ConvertOptions. Closes #53, closes #51 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Extracts a shared edge-flood-fill mask so subject/background is connectivity-based, not color-based.
--background <color>repaints the detected background to any chosen color (hex/named);--solid-background==--background auto.96 tests pass + ruff clean. Visually verified (PO) on dog-pink-wall: ears intact, custom cream/solid backgrounds clean.
Closes #53, closes #51
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