colour.hdr_CIELab_to_XYZ¶
- colour.hdr_CIELab_to_XYZ(Lab_hdr: ArrayLike, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65'], Y_s: FloatingOrArrayLike = 0.2, Y_abs: FloatingOrArrayLike = 100, method: Union[Literal['Fairchild 2011', 'Fairchild 2010'], str] = 'Fairchild 2011') numpy.ndarray [source]¶
Convert from hdr-CIELAB colourspace to CIE XYZ tristimulus values.
- Parameters
Lab_hdr (ArrayLike) – hdr-CIELAB colourspace array.
illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.
Y_s (FloatingOrArrayLike) – Relative luminance \(Y_s\) of the surround.
Y_abs (FloatingOrArrayLike) – Absolute luminance \(Y_{abs}\) of the scene diffuse white in \(cd/m^2\).
method (Union[Literal['Fairchild 2011', 'Fairchild 2010'], str]) – Computation method.
- Returns
CIE XYZ tristimulus values.
- Return type
Notes
Domain
Scale - Reference
Scale - 1
Lab_hdr
L_hdr
: [0, 100]a_hdr
: [-100, 100]b_hdr
: [-100, 100]L_hdr
: [0, 1]a_hdr
: [-1, 1]b_hdr
: [-1, 1]illuminant
[0, 1]
[0, 1]
Y_s
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
XYZ
[0, 1]
[0, 1]
References
Examples
>>> Lab_hdr = np.array([51.87002062, 60.4763385, 32.14551912]) >>> hdr_CIELab_to_XYZ(Lab_hdr) array([ 0.2065400..., 0.1219722..., 0.0513695...]) >>> Lab_hdr = np.array([31.99621114, 128.00763036, 48.76952309]) >>> hdr_CIELab_to_XYZ(Lab_hdr, method='Fairchild 2010') ... array([ 0.2065400..., 0.1219722..., 0.0513695...])