code: def limits(self, clip_negative=True):
          
          min, max = dtype_range[self.as_numpy_dtype]  # pylint: disable=redefined-builtin
          if clip_negative:
              min = 0  # pylint: disable=redefined-builtin
          return min, max
docs: 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.