test_colorconv.py 文件源码

def test_rgb2luv_brucelindbloom(self):
        """
        Test the RGB->Lab conversion by comparing to the calculator on the
        authoritative Bruce Lindbloom
        [website](http://brucelindbloom.com/index.html?ColorCalculator.html).
        """
        # Obtained with D65 white point, sRGB model and gamma
        gt_for_colbars = np.array([
            [100, 0, 0],
            [97.1393, 7.7056, 106.7866],
            [91.1132, -70.4773, -15.2042],
            [87.7347, -83.0776, 107.3985],
            [60.3242, 84.0714, -108.6834],
            [53.2408, 175.0151, 37.7564],
            [32.2970, -9.4054, -130.3423],
            [0, 0, 0]]).T
        gt_array = np.swapaxes(gt_for_colbars.reshape(3, 4, 2), 0, 2)
        assert_array_almost_equal(rgb2luv(self.colbars_array),
                                  gt_array, decimal=2)