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Harden scale-registered SynthID detection

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Victor Kuznetsov
2026-08-11 21:50:31 -07:00
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@@ -64,13 +64,19 @@ TrustMark. Metadata inspection still runs.
```bash
remove-ai-watermarks detect-synthid image.png
remove-ai-watermarks detect-synthid image.png --json
remove-ai-watermarks detect-synthid resized.png --register-scale
```
The command returns one of `detected`, `not_detected`, or `unsupported`. The
runtime detector covers one frozen periodic carrier family in the
[calibrated image-size range](synthid.md#32-how-our-tool-detects-the-supported-carrier)
and needs the `pixels` extra. It never resizes the input and does not register
a carrier whose sampling period changed through arbitrary spatial resampling.
and needs the `pixels` extra. The default never resizes the input and does not
register a carrier whose sampling period changed through spatial resampling.
`--register-scale` enables a substantially slower bounded search over measured
carrier periods for images from 250,000 through 10,000,000 decoded pixels, with
both sides at least 64 pixels. It is opt-in and is not used by `identify`.
The measured positive scale range is approximately 0.65 through 1.5; 0.5x
resizes are not reliably detected.
It is positive-only: `not_detected` means the score stayed below this detector's
threshold, while `unsupported` means the image geometry is outside its scope.
Neither result proves that another SynthID epoch or payload is absent.