code: def _process_channels(self,p,**params_to_override):
          
          orig_image = self._image
  
          for i in range(len(self._channel_data)):
              self._image = self._original_channel_data[i]
              self._channel_data[i] = self._reduced_call(**params_to_override)
          self._image = orig_image
          return self._channel_data
docs: Add the channel information to the channel_data attribute.