colour.DIN99_to_XYZ#
- colour.DIN99_to_XYZ(Lab_99: ArrayLike, 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') NDArrayFloat [source]#
Convert from DIN99 colourspace or one of the DIN99b, DIN99c, DIN99d refined formulas according to Cui et al. (2002) to CIE XYZ tristimulus values.
- Parameters:
Lab_99 (ArrayLike) – DIN99 colourspace array.
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 to choose between the [ASTMInternational07] formula and the refined formulas according to Cui et al. (2002).
- Returns:
CIE XYZ tristimulus values.
- Return type:
Notes
Domain
Scale - Reference
Scale - 1
Lab_99
L_99
: [0, 100]a_99
: [-100, 100]b_99
: [-100, 100]L_99
: [0, 1]a_99
: [-1, 1]b_99
: [-1, 1]illuminant
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
XYZ
[0, 1]
[0, 1]
References
Examples
>>> import numpy as np >>> Lab_99 = np.array([53.22821989, 28.41634656, 3.89839552]) >>> DIN99_to_XYZ(Lab_99) array([ 0.2065400..., 0.1219722..., 0.0513695...])