- Backend: POST /api/image/replace-subject
Uses rembg to extract the subject from a source photo, scales it to fit
the selection mask bounding box (or canvas centre when no selection is
active), applies a partial LAB color transfer (blend=0.45) so the
subject's lighting matches the background, then composites the result.
Also adds POST /api/image/extract-subject for standalone subject extraction.
- Frontend: "Replace with subject from file" button in the selection panel
(selection_actions.js) — opens a native file picker so no clipboard API
or HTTPS is required. Calls the new endpoint with the current SAM mask.
- Frontend: Image > Replace Subject (AI)... menu entry backed by
modules/image/replace_subject.js — a full dialog with file picker,
thumbnail preview, and "match background lighting" toggle. Works with
or without a prior Smart Select; if a selection exists it confines the
subject to that region.
https://claude.ai/code/session_01UtrvbisMp1yGu6PqeLmrFr
Claude
142df74192