def IPT_to_XYZ(cobj, *args, **kwargs):
    """
    Converts IPT to XYZ.
    """
    ipt_values = numpy.array(cobj.get_value_tuple())
    lms_values = numpy.dot(
        numpy.linalg.inv(IPTColor.conversion_matrices['lms_to_ipt']),
        ipt_values)

    lms_prime = numpy.sign(lms_values) * numpy.abs(lms_values) ** (1 / 0.43)

    xyz_values = numpy.dot(
        numpy.linalg.inv(IPTColor.conversion_matrices['xyz_to_lms']),
        lms_prime)
    return XYZColor(*xyz_values, observer='2', illuminant='d65')
Converts IPT to XYZ.