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P42 frame analysis (LV_P42_SHOT=1)
frames: docs/evidence/p42-splash-1.png (frame 10), p42-splash-2.png (frame 28), p42-menu-anim.png (frame 150)
1) splash frame diff (frame 10 vs frame 28)
full_frame_mean_abs_diff = 6.023 (reference: static sky dilutes it)
scene_band y>=480 mean_abs_diff = 14.259 (required > 8)
scene changed_px (|diff|>8) = 77568 (required > 30000)
verdict = PASS
2) menu water band per-column brightness (rows height-96 and height-64, 32px tall)
columns = 40 (each 32px tile column)
across-column std = 19.142
column-mean range = [47.7, 100.8] (span 53.1)
per-column vertical std range = [7.960, 46.151]
3) crest highlight columns (menu frame 150, sin phase > 0.55)
crest_column_count = 16 of 40
crest_columns = [2, 3, 7, 8, 12, 13, 17, 18, 22, 23, 27, 28, 32, 33, 37, 38]
4) sha256 before -> after (previous weak-ripple P42 -> strengthened ripple)
p42-splash-1.png before=77c4445902c700830fd32a4f39c5063f0a7d9510fafd4b7f63482ac0d4c1ff9d after=cfc6ba3614d76e15d8df8deb9ec9158b2d3bd1eb676314b440299d3b39c69aef DIFFERS
p42-splash-2.png before=08ef2edc1ef8159a94d03009107d3109f3c68efd1b3c477f0d02c14398ad4306 after=a16d76f898746787f9aa9123eda4ff71a1022790f73feb2040cc6426942f7baa DIFFERS
p42-menu-anim.png before=eaef98765e4cc66e5130d01bb45f81beacb67b222e4faf1077c5f8f53e757b13 after=1f33a9db54dfed07ed4b6650164abed286562de4f879907c93b47879e4375cb7 DIFFERS
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