colour.temperature.CCT_to_xy_Hernandez1999

colour.temperature.CCT_to_xy_Hernandez1999(CCT: ArrayLike, optimisation_kwargs: dict | None = None) → NDArrayFloat

Compute the CIE xy chromaticity coordinates from the specified correlated colour temperature \(T_{cp}\) using Hernandez-Andres et al. (1999) method.

Parameters:

• CCT (ArrayLike) – Correlated colour temperature \(T_{cp}\).

• optimisation_kwargs (dict | None) – Parameters for scipy.optimize.minimize() definition.

Returns:

CIE xy chromaticity coordinates.

Return type:

numpy.ndarray

Warning

Hernandez-Andres et al. (1999) method for computing CIE xy chromaticity coordinates from the specified correlated colour temperature is not a bijective function and might produce unexpected results. It is provided for consistency with other correlated colour temperature computation methods but should be avoided for practical applications. The current implementation relies on optimisation using scipy.optimize.minimize() definition and thus has reduced precision and poor performance.

References

[HernandezAndresLR99]

Examples

>>> CCT_to_xy_Hernandez1999(6500.7420431786531)
array([0.3127..., 0.329...])