Original PickImageColors source-file lab, 2026-10-25.
How do coordinates map to a double-resolution image?
Run: python reproduce.py --case double-resolution-image-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.
We did not measure a phone, a browser’s devicePixelRatio or a live screenshot tool. Bilinear resizing, cropping, rotation and fractional preview scaling are outside this exact-block example.
