INNER CODE UNIT · Python

l

NVlabs/instant-ngp · scripts/flip/__init__.py:100

        l = 116 * input_color[1:2, :, :] - 16
        a = 500 * (input_color[0:1,:, :] - input_color[1:2, :, :])
        b = 200 * (input_color[1:2, :, :] - input_color[2:3, :, :])

        transformed_color = np.concatenate((l, a, b), 0)

    elif fromSpace2toSpace == "lab2xyz":
        y = (input_color[0:1, :, :] + 16) / 116
        a =  input_color[1:2, :, :] / 500
        b =  input_color[2:3, :, :] / 200

        x = y + a
        z = y - b

        xyz = np.concatenate((x, y, z), 0)
        delta = 6 / 29
        xyz = np.where(xyz > delta,  xyz ** 3, 3 * delta ** 2 * (xyz - 4 / 29))

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