colour.XYZ_to_DIN99#

colour.XYZ_to_DIN99(XYZ: Domain1, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65'], k_E: float = 1, k_CH: float = 1, method: Literal['ASTMD2244-07', 'DIN99', 'DIN99b', 'DIN99c', 'DIN99d'] | str = 'DIN99') → Range100[source]#

Convert from CIE XYZ tristimulus values to DIN99 colourspace or one of the DIN99b, DIN99c, DIN99d refined formulas according to Cui et al. (2002).

Parameters:

  • XYZ (Domain1) – CIE XYZ tristimulus values.

  • illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.

  • k_E (float) – Parametric factor \(K_E\) used to compensate for texture and other specimen presentation effects.

  • k_CH (float) – Parametric factor \(K_{CH}\) used to compensate for texture and other specimen presentation effects.

  • method (Literal['ASTMD2244-07', 'DIN99', 'DIN99b', 'DIN99c', 'DIN99d'] | str) – Computation method.

Returns:

DIN99 colourspace array.

Return type:

numpy.ndarray

Notes

Domain

Scale - Reference

Scale - 1

XYZ

1

1

illuminant

1

1

Range

Scale - Reference

Scale - 1

Lab_99

100

1

References

[ASTMInternational07]

Examples

>>> import numpy as np
>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_DIN99(XYZ)
array([53.2282198..., 28.4163465...,  3.8983955...])
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