Gradient-Field Image Authenticity Check

Client-side luminance → gradients → covariance → score. No uploads to a server.

Input (fit to 512×512)

Processed (gradient magnitude)

Choose an image to begin.

Score:

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Heuristic result:

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How the analysis works

We analyze luminance gradients at multiple crops and scales. We ignore low-gradient “flat” pixels by keeping only pixels above a gradient magnitude percentile, then compute gradient covariance and a PCA-style anisotropy score.