colour.characterisation.colour_correction_matrix_Cheung2004¶
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colour.characterisation.
colour_correction_matrix_Cheung2004
(M_T, M_R, terms=3)[source]¶ Computes a colour correction from given \(M_T\) colour array to \(M_R\) colour array using Cheung et al. (2004) method.
- Parameters
M_T (array_like, (3, n)) – Test array \(M_T\) to fit onto array \(M_R\).
M_R (array_like, (3, n)) – Reference array the array \(M_T\) will be colour fitted against.
terms (int, optional) – Number of terms of the expanded polynomial, must be one of [3, 5, 7, 8, 10, 11, 14, 16, 17, 19, 20, 22].
- Returns
Colour correction matrix.
- Return type
ndarray, (3, n)
References
Examples
>>> prng = np.random.RandomState(2) >>> M_T = prng.random_sample((24, 3)) >>> M_R = M_T + (prng.random_sample((24, 3)) - 0.5) * 0.5 >>> colour_correction_matrix(M_T, M_R) array([[ 1.0526376..., 0.1378078..., -0.2276339...], [ 0.0739584..., 1.0293994..., -0.1060115...], [ 0.0572550..., -0.2052633..., 1.1015194...]])