Return intensity limits, i.e. (min, max) tuple, of the dtype.
        Args:
          clip_negative : bool, optional
              If True, clip the negative range (i.e. return 0 for min intensity)
              even if the image dtype allows negative values.
        Returns
          min, max : tuple
            Lower and upper intensity limits.

def limits(self, clip_negative=True):
        """Return intensity limits, i.e. (min, max) tuple, of the dtype.
        Args:
          clip_negative : bool, optional
              If True, clip the negative range (i.e. return 0 for min intensity)
              even if the image dtype allows negative values.
        Returns
          min, max : tuple
            Lower and upper intensity limits.
        """
        min, max = dtype_range[self.as_numpy_dtype]  # pylint: disable=redefined-builtin
        if clip_negative:
            min = 0  # pylint: disable=redefined-builtin
        return min, max