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FRV histogram X-axis is in EV (stops), so it is easy to quick estimate image DR (not lowest/highest values, but 'significant pixel count').

For deep inspection with detailed statistics we suggest to use our RawDigger software. It provides detailed histograms, overall statistics (min/max) and can examine not only entire image, but also arbitrary rectangular selection.

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Alex Tutubalin/FastRawViewer team