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        Calculate statistics for the given image. If a mask is included,
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        :param image: A PIL image, or a precalculated histogram.

            .. note::

                For a PIL image, calculations rely on the
                :py:meth:`~PIL.Image.Image.histogram` method. The pixel counts are
                grouped into 256 bins, even if the image has more than 8 bits per
                channel. So ``I`` and ``F`` mode images have a maximum ``mean``,
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