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Victor Kuznetsov
96038f960f
The default img2img strength is now chosen from the detected SynthID vendor (C2PA issuer) instead of a single fixed 0.30: OpenAI gpt-image -> 0.10, Google Gemini -> 0.15, unknown source -> 0.15. Explicit --strength always wins. Basis: an oracle-verified June 2026 controlled study (clean v0.8.6, text/face protection OFF, per-image openai.com/verify or Gemini-app verdict). OpenAI's SynthID clears at 0.05 across 1024-1600 px (n=4, resolution-independent); Google's is ~3x more robust and needs 0.15 on the capped-1536 path (n=4). The dominant factor is the VENDOR, not resolution. The earlier single 0.30 default and the "resolution dependence" lore came from contaminated tests run with the protect-text bug ON (issue #14) -- re-running those same 1600x1600 images clean removes SynthID at 0.05. `vendor_for_strength(path)` reads metadata.synthid_source on the ORIGINAL input and is threaded through cli (invisible/all/batch) -> invisible_engine -> watermark_remover -> resolve_strength(strength, profile, vendor), so display and execution use the same vendor (the engine sees a temp path whose C2PA the visible pass already stripped, so detection must happen in the CLI on the pristine source). Caveat: Google's 0.15 was validated only on --max-resolution 1536; native 2816 Gemini was not locally measurable (OOM on Apple Silicon) and is pending GPU validation on raiw.cc. Docs: docs/synthid.md sections 2.2/4.4/5.2 corrected (the contaminated resolution-dependence findings replaced with the clean oracle-verified table); README and CLAUDE.md updated; CLI --strength help reflects the adaptive default. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>