# Backfill experiment — executed 2026-11-05 (Beijing)

Two original synthetic images were made at 640 × 480 px: each has a black circle and centered rectangle on white; their stroke widths are 2 and 12 px, respectively. The current local production snapshot was opened in Chrome, using Clean Outline and A4; the real PNG downloads are retained as thin-result.png and thick-result.png. Both outputs are 3508 × 2480 px. A per-position RGB difference calculation using Pillow reports 213,698 differing pixel positions out of 8,699,840. This tests two synthetic images only; it does not establish results for photographs, all line widths, other styles, or a physical print. The article and video have not been produced or deployed.