def on_load_comparison(self, research=False):
        """
        Display the comparison image
        @param research: find a new comparison image even if one already known?
        """

        cutout = self.model.get_current_cutout()
        if research:
            cutout.comparison_image_index = None
        comparison_image = cutout.comparison_image
        if comparison_image is None:
            print "Failed to load comparison image: {}".format(cutout.comparison_image_list[cutout.comparison_image_index])
        else:
            self.view.display(cutout.comparison_image, self.use_pixel_coords)
            self.view.align(self.model.get_current_cutout(),
                            self.model.get_current_reading(),
                            self.model.get_current_source())
            self.model.get_current_workunit().previous_obs()
            self.model.acknowledge_image_displayed()
Display the comparison image
        @param research: find a new comparison image even if one already known?