'Set the line color and ticks for the axes
Parameters
line_color : any matplotlib color
marker_edge_color : any matplotlib color'

def _config_axes(self, line_color=u'w', marker_edge_color=u'w'):

    for ax1 in [self.RGB, self.R, self.G, self.B]:
        ax1.axis[:].line.set_color(line_color)
        ax1.axis[:].major_ticks.set_markeredgecolor(marker_edge_color)
