def METHOD_NAME():
    color = np.c_[255, 65, 0]
    delta = np.c_[0, 65, 0]
    res = colormap._rgb_lab_delta(color, color)
    npt.assert_equal(res, 0)
    res = colormap._rgb_lab_delta(color, delta)
    npt.assert_equal(np.round(res), [114])