def color_hls ( c ) :
    """ Get HLS fot the color
    >>> color = ...
    >>> h, l, s = color.hls() 
    - see ROOT.TColor.GetHue
    - see ROOT.TColor.GetLight
    - see ROOT.TColor.GetSaturation
    """
    return c.GetHue() , c.GetLight() , c.GetSaturation()