Original PickImageColors source-file lab, 2026-10-25.
Why does a color coordinate change after cropping?
Run: python reproduce.py --case cropped-image-pixel-coordinates --out rerun
Dependency: Pillow. Recorded runtime: Python 3.12.14, Pillow 12.3.0, libwebp 1.6.0.
Measurements are local source-file computations, not browser observations. Library-dependent compression sizes and quantizer choices may change with runtime.
The coordinates here are zero-based source pixels in saved files. They are not pointer positions on a browser canvas. A displayed preview can add another scale mapping, and that separate transformation was not measured in this crop experiment.
