The algorithm combines radial-spectrum cliffs with Gallagher-style difference periodicity. Generative upscalers can invent high frequency, so confidence drops instead of faking certainty.
Product
Resolution integrity checker (fake 4K / fake 2K)
Native spectra usually extend toward Nyquist. Interpolated upscales often cliff near 0.5÷scale. This module is independent of C2PA: a file can be signed and still upscaled.
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