rembg Operations — cutouts for flat illustration & sticker art

Turn opaque, flat-background illustration (avatars, stickers, cartoon/vector art, generated character portraits) into clean transparent PNGs — without regenerating the source. rembg's ML models are the default engine; the value this skill adds is the deterministic fallback ladder for the cases pure ML gets wrong on flat-colour art.

The one thing to know

rembg is a semantic model, not a chroma keyer. isnet-anime (the model tuned for outlined cartoon art) segments the salient character and ignores background colour — so it cannot be "helped" with a greenscreen, and it fails in two predictable ways on flat art:

1. Pale / low-salience subjects get dropped (a near-white moon, a mint UFO on a light background read as "not the subject").
2. Baked drop-shadows survive as a grey ghost or an opaque offset blob.