E3 — SEED DETERMINISM · fal-ai/flux/dev · image_size=square(512×512) · 2026-07-16
Method: sips decodes JPEG→BMP, then compares pixel by pixel and channel by channel (evidence/_tools/pixdiff.mjs); sha256 is compared first, at byte level.

① Same seed, same parameters ×3 (seed=1024, steps=28, g=3.5): the three files are byte-identical, the first 16 characters of sha256 are 8dadd968e921aca2 in every case; 0/262144 pixels differ. A same-parameter call from another experiment (e1-steps/steps-28.jpg, about 1.9 minutes apart) carries the same sha256.
② Same seed, steps 28→29 (one rung apart): 191585/262144 pixels differ (73.084% (any Δ)), maximum single-channel delta 205/255.
③ Different seeds, same parameters (7 vs 4242 vs 90210): 99.967% (any Δ) and 99.994% (any Δ) of pixels differ, maximum single-channel deltas 243 and 236.