Preview Server Test

Generates a synthetic green-screen foreground and a gradient background in the browser, sends them to POST /api/preview on the preview server (same host, or the deployed fallback if same-origin has none), and shows the chroma-keyed composite that the server-side preview renderer returns.

chroma idle

Foreground (green screen)

orange disc + label on a solid chroma fill

Background

navy → blue gradient (the new backdrop)

Result from preview server

preview server composite output will appear here

— not run yet —

Ready. Click “Run preview test”.