def ToPdfRGB(R, G, B):
    """
    Tuple ToPdfRGB(Tuple RGB)

    Convert the standard RGB (0 ~ 255)
    to pdf normalized RGB (0 ~ 1)

    The RGB is 3 elements Tuple, i.e, (R, G, B).
    Returns pdfRGB in tupl, , i.e, (pdfR, pdfG, pdfB)
    """
    return 1.0 * R / 255, 1.0 * G / 255, 1.0 * B / 255
