def check_grayscale(image):
    """
    Checks if the input image is grayscale OUTSIDE Processing class.

    Args:
        image: Array representation of image to check if Grayscale
    Returns:
        GRAY: If the image is grayscale
        COLOR: if the image is color
    """
    # Image array length should not be 3 (color).
    a = image[:, :, 0] == image[:, :, 1]
    b = image[:, :, 1] == image[:, :, 2]
    c = a == b
    if c.all():
        return 'GRAY'
    else:
        return 'COLOR'