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Victor Kuznetsov
0f54c6b54d
Bright-background photos/renders and a tiny app icon were flagged as AI-generated by the visible detectors. Two failure modes: - Gemini sparkle on a bright background (snow+sky photo, white product render) scored ~0.51. The FP gate only demoted on a low core-ring brightness margin, which a bright background makes high. Add a gradient floor (_SPARKLE_FP_GRAD 0.55): a real sparkle is a crisp star (grad ~0.97-1.0), a smooth luminance blob that NCC-matches the diamond is not (the two FPs measured grad 0.105 / 0.463). The OR is a strict superset of the old margin-only demotion, so it cannot regress dark/mid (kept by margin) or white-bg (kept by confidence) real sparkles. - A 48x48 geometric icon matched the Doubao/Jimeng CJK silhouette at 0.41/0.47 NCC. Purely a small-size artifact (the same icon at >=256px collapses to ~0.06-0.10). Guard text-mark detection below a 200px short side (_MIN_DETECT_SHORT_SIDE); real marks ship on full-resolution renders (smallest captured sample 1086px). Corpus re-sweep flips only OpenAI content and already-cleaned outputs, all sub-0.5, so no provenance verdict changes. Add synthetic regression fixtures for both modes; docs/module-internals.md updated. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>