def _match_cmap(self, fitsimage, colorbar):
        """
        Help method to change the ColorBar to match the cut levels or
        colormap used in a ginga ImageView.
        """
        rgbmap = fitsimage.get_rgbmap()
        loval, hival = fitsimage.get_cut_levels()
        colorbar.set_range(loval, hival)
        # If we are sharing a ColorBar for all channels, then store
        # to change the ColorBar's rgbmap to match our
        colorbar.set_rgbmap(rgbmap)
Help method to change the ColorBar to match the cut levels or
        colormap used in a ginga ImageView.