4 test images generated via Gemini API with real content:
- 2x 9:16 (cat, mountain) at 1344x768
- 2x 4:3 (coffee, city) at 864x1184
V3 bypass results with expanded codebook:
| Image | Resolution | PSNR | SSIM | Exact Match |
| city (4:3) | 864x1184 | 45.7 dB | 0.9972 | yes |
| coffee (4:3) | 864x1184 | 50.0 dB | 0.9981 | yes |
| cat (9:16) | 1344x768 | 50.2 dB | 0.9978 | yes |
| mountain (9:16)| 1344x768 | 49.1 dB | 0.9971 | yes |
PSNR/SSIM are excellent. Phase coherence drop is near-zero, suggesting
the API-generated images may have weaker watermark embedding than
web-UI outputs, or the carrier extraction needs further tuning.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Ben Ren