code: def gamma(self, gamma=1.0):
          
          if isinstance(gamma, (list, tuple)):
              gamma = self.xrify_tuples(gamma)
          elif gamma == 1.0:
              return
  
          logger.debug("Applying gamma %s", str(gamma))
          attrs = self.data.attrs
          self.data = self.data.clip(min=0)
          self.data **= 1.0 / gamma
          self.data.attrs = attrs
docs: Apply gamma correction to the channels of the image.
  
          If *gamma* is a
          tuple, then it should have as many elements as the channels of the
          image, and the gamma correction is applied elementwise. If *gamma* is a
          number, the same gamma correction is applied on every channel, if there
          are several channels in the image. The behaviour of :func:`gamma` is
          undefined outside the normal [0,1] range of the channels.