Color Manifest Generator
Reads your Mahjong mat photos (from your 7 mat collections) and builds the color data file the widget needs. Runs entirely in this browser tab — nothing is sent anywhere except to your own store.
After downloading: in Shopify admin, go to Online Store → Themes → your "Color-Match Widget (preview)" theme → Edit code → Assets → Add a new asset → upload this file. That's the last step.