def _RGB2sRGB(RGB):
    """
    Convert the 24-bits Adobe RGB color to the standard RGB color defined
    in Web Content Accessibility Guidelines (WCAG) 2.0
    see https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef for more references

    :param RGB: The input RGB color or colors shape== ... x 3 (R, G, and B channels)
    :type RGB: numpy.ndarray
    :return: converted sRGB colors
    :rtype: numpy.ndarray
    """
    sRGB = RGB / 255
    return sRGB