    def _render_now(self):
        """
        Common method to render the latest image.

        :returns: A tuple of the plain image and the colour map as per
        :py:meth:`.rendered_text`.
        """
Common method to render the latest image.

:returns: A tuple of the plain image and the colour map as per
:py:meth:`.rendered_text`.
asciimatics/renderers/base.py