Measure a picture
Open (or drop) a picture: the house, the garden, a curtain plate.
Point = click. Box = drag. Polygon = click the corners, then press Enter (or double-click) to close it.

Every number is a fraction (0–1) of the picture's width or height, the way src/config/*.ts and tools/lit_layer.py expect them. Pixel values are listed too (for CROP in src/config/house.ts). Nothing leaves this page: it runs offline.