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Pictures: Remove Background with a classical matte

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The Picture Format > Remove Background button was a disabled
placeholder. picture.removeBackground now flood-fills from every edge
pixel through similar colours: each step must be close to the pixel
before it (so gradients and soft shadows follow) and to the edge colour
it started from (so it can't leak into the subject). That region turns
transparent with a one-pixel soft edge, and the picture points at a new
PNG; undo brings the original back. Tolerance 0-100 (default 20); the
ribbon offers normal, looser and tighter. Pictures whose edges are all
subject are left alone, and pictures over 16 megapixels are refused.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Nikita Rakitin
2026-10-13 23:35:25 +03:00
co-authored by Cursor
parent 457406a7a5
commit bc42b62cc4
4 changed files with 253 additions and 4 deletions
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docs/gaps.md
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@@ -185,8 +185,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
### Smaller missing rows
Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
sounds (1–2 h), artistic effects (6–10 h), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).