'Make a reversed instance of the Colormap.
.. note :: Function not implemented for base class.
Parameters
name : str, optional
The name for the reversed colormap. If it\'s None the
name will be the name of the parent colormap + "_r".
Notes
See :meth:`LinearSegmentedColormap.reversed` and
:meth:`ListedColormap.reversed`'

def reversed(self, name=None):

    raise NotImplementedError()
