# OpenAI ChatGPT Images 2.0 sample

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.

## `amur-leopard.png`

- Resolution: 1055 x 1491, PNG, 3.0 MB
- Downloaded: 2026-04-22
- Content: AI-generated infographic about the Amur leopard (*Panthera pardus orientalis*), chosen to exercise the model's new accurate-text-rendering feature

### Embedded C2PA manifest (caBX chunk, 23607 bytes)

Parsed by `remove-ai-watermarks metadata --check`:

| Field | Value |
| --- | --- |
| `claim_generator` | GPT-4o |
| `c2pa_spec` | 2.2.0 |
| `digital_source_type` | http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia |
| `c2pa_actions` | created, converted |
| Signer | OpenAI OpCo, LLC / OpenAI Media Service API |
| Claim signing CA | Trufo C2PA Claim Signing CA (2025) -> Trufo C2PA Root CA (ECC P384) |
| Timestamp authority | OpenAI TSA Issuing CA -> OpenAI TSA Root CA |

The `trainedAlgorithmicMedia` tag is what triggers "Made with AI" labels on Instagram, Facebook, and X.

### Invisible pixel-level watermark

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.

## Reproducing the removal

```bash
# C2PA strip only
remove-ai-watermarks metadata amur-leopard.png --remove -o amur-leopard.clean.png

# Full pipeline (visible + diffusion regeneration + metadata)
remove-ai-watermarks all amur-leopard.png -o amur-leopard.all.png --device mps
```

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.
