Original PickImageColors source-file lab, 2026-10-25.
Does lossless WebP preserve the RGB of transparent pixels?
Run: python reproduce.py --case lossless-webp-transparent-rgb --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.
This is a local encoder and decoder experiment, not a claim that a browser color picker can recover invisible RGB. Alpha-zero pixels have no visible color in these composites. Other encoder versions can produce different file sizes; the manifest records the actual runtime.
