colour.temperature.uv_to_CCT_Krystek1985#

colour.temperature.uv_to_CCT_Krystek1985(uv: ArrayLike, optimisation_kwargs: dict | None = None) → NDArrayFloat[source]#

Return the correlated colour temperature \(T_{cp}\) from given CIE UCS colourspace uv chromaticity coordinates using Krystek (1985) method.

Parameters:

  • uv (ArrayLike) – CIE UCS colourspace uv chromaticity coordinates.

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

Returns:

Correlated colour temperature \(T_{cp}\).

Return type:

numpy.ndarray

Warning

Krystek (1985) does not give an analytical inverse transformation to compute the correlated colour temperature \(T_{cp}\) from given CIE UCS colourspace uv chromaticity coordinates, the current implementation relies on optimisation using scipy.optimize.minimize() definition and thus has reduced precision and poor performance.

Notes

  • Krystek (1985) method computations are valid for correlated colour temperature \(T_{cp}\) normalised to domain [1000, 15000].

References

[Kry85]

Examples

>>> uv_to_CCT_Krystek1985(np.array([0.20047203, 0.31029290]))
... 
6504.3894290...