How to remove a flat background from a photo

1. Upload the photo

   Drop the image into the Image field. Works best with subjects on a fairly uniform backdrop — studio photos, white cyclorama, or solid coloured walls.

2. How the removal works

   The tool estimates the border colour (median of edge pixels), then removes regions connected to the frame that look close to that estimate. This is NOT AI matting — fine hair, glass, or subjects matching the backdrop won't separate cleanly.

3. Tune "Border color match"

   edgeTolerance (8–72, default 24) is the max RGB-channel difference from the estimated border colour. Lower it when too much of your subject vanishes; raise it when the backdrop is still visible.

4. Press Run and check the note

   Output is a PNG with transparency saved as subject-transparent.png. If the note warns that almost everything or almost nothing was removed, adjust the tolerance and run again.