colour.temperature.uv_to_CCT_Krystek1985¶

colour.temperature.uv_to_CCT_Krystek1985(uv, optimisation_kwargs=None)[source]¶

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

Parameters

uv (array_like) – CIE UCS colourspace uv chromaticity coordinates.
optimisation_kwargs (dict_like, optional) – Parameters for scipy.optimize.minimize() definition.

Returns

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

Return type

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 optimization 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...