colour.RGB_to_XYZ¶
- colour.RGB_to_XYZ(RGB: ArrayLike, illuminant_RGB: ArrayLike, illuminant_XYZ: ArrayLike, matrix_RGB_to_XYZ: ArrayLike, chromatic_adaptation_transform: Union[Literal['Bianco 2010', 'Bianco PC 2010', 'Bradford', 'CAT02 Brill 2008', 'CAT02', 'CAT16', 'CMCCAT2000', 'CMCCAT97', 'Fairchild', 'Sharp', 'Von Kries', 'XYZ Scaling'], str] = 'CAT02', cctf_decoding: Optional[Callable] = None) numpy.ndarray [source]¶
Convert given RGB colourspace array to CIE XYZ tristimulus values.
- Parameters
RGB (ArrayLike) – RGB colourspace array.
illuminant_RGB (ArrayLike) – CIE xy chromaticity coordinates or CIE xyY colourspace array of the illuminant for the input RGB colourspace array.
illuminant_XYZ (ArrayLike) – CIE xy chromaticity coordinates or CIE xyY colourspace array of the illuminant for the output CIE XYZ tristimulus values.
matrix_RGB_to_XYZ (ArrayLike) – Matrix converting the RGB colourspace array to CIE XYZ tristimulus values, i.e. the Normalised Primary Matrix (NPM).
chromatic_adaptation_transform (Union[Literal['Bianco 2010', 'Bianco PC 2010', 'Bradford', 'CAT02 Brill 2008', 'CAT02', 'CAT16', 'CMCCAT2000', 'CMCCAT97', 'Fairchild', 'Sharp', 'Von Kries', 'XYZ Scaling'], str]) – Chromatic adaptation transform, if None no chromatic adaptation is performed.
cctf_decoding (Optional[Callable]) – Decoding colour component transfer function (Decoding CCTF) or electro-optical transfer function (EOTF).
- Returns
CIE XYZ tristimulus values.
- Return type
Notes
Domain
Scale - Reference
Scale - 1
RGB
[0, 1]
[0, 1]
illuminant_XYZ
[0, 1]
[0, 1]
illuminant_RGB
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
XYZ
[0, 1]
[0, 1]
Examples
>>> RGB = np.array([0.45595571, 0.03039702, 0.04087245]) >>> illuminant_RGB = np.array([0.31270, 0.32900]) >>> illuminant_XYZ = np.array([0.34570, 0.35850]) >>> chromatic_adaptation_transform = 'Bradford' >>> matrix_RGB_to_XYZ = np.array( ... [[0.41240000, 0.35760000, 0.18050000], ... [0.21260000, 0.71520000, 0.07220000], ... [0.01930000, 0.11920000, 0.95050000]] ... ) >>> RGB_to_XYZ(RGB, illuminant_RGB, illuminant_XYZ, matrix_RGB_to_XYZ, ... chromatic_adaptation_transform) array([ 0.2163881..., 0.1257 , 0.0384749...])