code: def add_image_info_cb(self, viewer, channel, image_info):
          
          chname = channel.name
          name = image_info.name
          self.logger.debug("name=%s" % (name))
  
          # Updates of any extant information
          try:
              image = channel.get_loaded_image(name)
          except KeyError:
              # images that are not yet loaded will show "N/A" for keywords
              image = None
  
          self.add_image_cb(viewer, chname, image, image_info)
docs: Almost the same as add_image_cb(), except that the image
          may not be loaded in memory.