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test-userandClaude Sonnet 4.6
87d02126e3
- metadata --check now shows claim_generator, c2pa_spec, digital_source_type, c2pa_actions, signer instead of empty table for C2PA-only files - reuses existing extract_c2pa_chunk() from noai/c2pa.py — no more duplicate PNG chunk parsing or full-file reads - adds data/samples/openai-images-2/amur-leopard.png: real gpt-image-2 output with C2PA manifest signed by OpenAI OpCo LLC / Trufo CA (spec 2.2.0) - removes stale data/samples/nano-banana-1/2.png (no longer referenced) - updates README: new Images 2.0 row in supported models table - documents known text-degradation limitation in CLAUDE.md Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
42 lines
1.8 KiB
Markdown
42 lines
1.8 KiB
Markdown
# OpenAI ChatGPT Images 2.0 sample
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Reference image generated by OpenAI's ChatGPT Images 2.0 (`gpt-image-2`, launched 2026-04-21). Kept in the repo so the C2PA manifest parser and invisible-watermark pipeline can be re-verified against a real production output.
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## `amur-leopard.png`
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- Resolution: 1055 x 1491, PNG, 3.0 MB
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- Downloaded: 2026-04-22
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- Content: AI-generated infographic about the Amur leopard (*Panthera pardus orientalis*), chosen to exercise the model's new accurate-text-rendering feature
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### Embedded C2PA manifest (caBX chunk, 23607 bytes)
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Parsed by `remove-ai-watermarks metadata --check`:
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| Field | Value |
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| --- | --- |
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| `claim_generator` | GPT-4o |
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| `c2pa_spec` | 2.2.0 |
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| `digital_source_type` | http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia |
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| `c2pa_actions` | created, converted |
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| Signer | OpenAI OpCo, LLC / OpenAI Media Service API |
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| Claim signing CA | Trufo C2PA Claim Signing CA (2025) -> Trufo C2PA Root CA (ECC P384) |
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| Timestamp authority | OpenAI TSA Issuing CA -> OpenAI TSA Root CA |
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The `trainedAlgorithmicMedia` tag is what triggers "Made with AI" labels on Instagram, Facebook, and X.
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### Invisible pixel-level watermark
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OpenAI's system card for Images 2.0 states the model embeds an "imperceptible, robust, and content-specific" pixel-level watermark alongside C2PA. No public detector exists, so bypass cannot be verified empirically for this sample.
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## Reproducing the removal
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```bash
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# C2PA strip only
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remove-ai-watermarks metadata amur-leopard.png --remove -o amur-leopard.clean.png
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# Full pipeline (visible + diffusion regeneration + metadata)
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remove-ai-watermarks all amur-leopard.png -o amur-leopard.all.png --device mps
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```
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Note: the diffusion step downscales to 768 px, which degrades fine text on text-heavy infographics like this one. Tracked as a known limitation; see project TODO.
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