Original 640x480 synthetic illustration: black rounded rectangle and circle, with nine thin lines. The 320x240 and 80x60 PNGs were downsampled from it with Pillow Lanczos. Actual Chrome downloads of current production snapshot, Clean Outline, A4. Each output was 3508x2480. Pairwise pixel difference counts and SHA-256 are in measurements.json; resizing changes sampled pixels. No physical print, photographs or competitor conversions. App SHA-256: fb728a912378c8e7350a98bbbe3b656a5da1c96955411e3c3ec9e83b30dea13c