['COLORMAP_AUTUMN', 'COLORMAP_BONE', 'COLORMAP_COOL', 'COLORMAP_HOT',
    'COLORMAP_HSV', 'COLORMAP_JET', 'COLORMAP_OCEAN', 'COLORMAP_PINK',
    'COLORMAP_RAINBOW', 'COLORMAP_SPRING', 'COLORMAP_SUMMER', 'COLORMAP_WINTER'
    ]
How to get the red channel color space of an image?