colour.difference.delta_E_ITP#

colour.difference.delta_E_ITP(ICtCp_1: ArrayLike, ICtCp_2: ArrayLike) → NDArrayFloat[source]#

Return the difference \(\Delta E_{ITP}\) between two given \(IC_TC_P\) colour encoding arrays using Recommendation ITU-R BT.2124.

Parameters:

  • ICtCp_1 (ArrayLike) – \(IC_TC_P\) colour encoding array 1.

  • ICtCp_2 (ArrayLike) – \(IC_TC_P\) colour encoding array 2.

Returns:

Colour difference \(\Delta E_{ITP}\).

Return type:

numpy.ndarray

Notes

  • A value of 1 is equivalent to a just noticeable difference when viewed in the most critical adaptation state.

References

[InternationalTUnion19]

Examples

>>> ICtCp_1 = np.array([0.4885468072, -0.04739350675, 0.07475401302])
>>> ICtCp_2 = np.array([0.4899203231, -0.04567508203, 0.07361341775])
>>> delta_E_ITP(ICtCp_1, ICtCp_2)  
1.42657228...