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data(corpus): archive June 2026 SynthID strength-study subjects

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Back docs/synthid.md section 2.2 with the actual test set: the per-image
oracle-verified subjects were only in a local working dir, while the doc claimed
they were recorded in data/synthid_corpus/. Ingest the key pos+cleaned pairs so
the claim holds.

- pos: openai_1/2/3 originals (gpt-image, openai-verify) + gemini_1/2/3/4
  originals (Gemini app, gemini-app); all probe as C2PA-SynthID present.
- cleaned: OpenAI at strength 0.05 (openai_2 only s010 captured) + Gemini at 0.15
  --max-resolution 1536; oracle: SynthID NOT detected. Metadata stripped, so no
  C2PA on the cleaned rows.
- Excluded the third-party issue #14 image (pic3): oracle-verified but not
  committed to the public corpus.
- docs/synthid.md 2.2: state OpenAI n=4 = 3 archived + 1 external-only.
- CLAUDE.md: drop the drift-prone "~65 MB" corpus size from the sdist note.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Victor Kuznetsov
2026-06-03 17:09:58 -07:00
parent 5ec8269949
commit 8523f48fb6
17 changed files with 21 additions and 4 deletions
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docs/synthid.md
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@@ -175,12 +175,15 @@ A controlled study (June 2026, clean v0.8.6 with text/face protection OFF,
native resolution on this repo's default SDXL pipeline) measured the minimum
img2img strength that removes the SynthID pixel watermark, verified per image on
the vendor's own oracle (openai.com/verify for OpenAI, the Gemini app "Verify
with SynthID" for Google). The test set and per-image results are recorded in
`data/synthid_corpus/` (manifest `verified_via` = `openai-verify` / `gemini-app`).
with SynthID" for Google). Each subject is archived in `data/synthid_corpus/` as a
pos original plus its minimum-clearing cleaned output (manifest `verified_via` =
`openai-verify` / `gemini-app`), EXCEPT one third-party image from issue #14, which
was oracle-verified but is not committed (third-party content stays out of the
public corpus).
| Vendor | Images | Resolution(s) | Pipeline | Removed at |
|--------|--------|---------------|----------|------------|
| OpenAI (gpt-image) | n=4 | 1024x1536 .. 1600x1600 | native | **0.05** |
| OpenAI (gpt-image) | n=4 (3 archived + 1 external-only) | 1024x1536 .. 1600x1600 | native | **0.05** |
| Google (Gemini) | n=4 | 2816x1536 -> capped 1536 | `--max-resolution 1536` | **0.15** (0.05 and 0.10 do NOT clear) |
**Two findings, both oracle-verified:**