def make_cmap(self, background_color='#000000', random_state=None):
        """
        Define a matplotlib colormap consisting of (random) muted
        colors.

        This is very useful for plotting the segmentation image.

        Parameters
        ----------
        background_color : str or `None`, optional
            A hex string in the "#rrggbb" format defining the first
            color in the colormap.  This color will be used as the
            background color (label = 0) when plotting the segmentation
            image.  The default is black ('#000000').

        random_state : int or `~numpy.random.RandomState`, optional
            The pseudo-random number generator state used for random
            sampling.  Separate function calls with the same
            ``random_state`` will generate the same colormap.

        Returns
        -------
        cmap : `matplotlib.colors.ListedColormap`
            The matplotlib colormap.
        """

        from matplotlib import colors

        cmap = make_random_cmap(self.max_label + 1, random_state=random_state)

        if background_color is not None:
            cmap.colors[0] = colors.hex2color(background_color)

        return cmap
Define a matplotlib colormap consisting of (random) muted
        colors.

        This is very useful for plotting the segmentation image.

        Parameters
        ----------
        background_color : str or `None`, optional
            A hex string in the "#rrggbb" format defining the first
            color in the colormap.  This color will be used as the
            background color (label = 0) when plotting the segmentation
            image.  The default is black ('#000000').

        random_state : int or `~numpy.random.RandomState`, optional
            The pseudo-random number generator state used for random
            sampling.  Separate function calls with the same
            ``random_state`` will generate the same colormap.

        Returns
        -------
        cmap : `matplotlib.colors.ListedColormap`
            The matplotlib colormap.