colour.XYZ_to_hdr_IPT¶
-
colour.
XYZ_to_hdr_IPT
(XYZ, Y_s=0.2, Y_abs=100, method='Fairchild 2011')[source]¶ Converts from CIE XYZ tristimulus values to hdr-IPT colourspace.
Parameters: - XYZ (array_like) – CIE XYZ tristimulus values.
- Y_s (numeric or array_like) – Relative luminance \(Y_s\) of the surround.
- Y_abs (numeric or array_like) – Absolute luminance \(Y_{abs}\) of the scene diffuse white in \(cd/m^2\).
- method (unicode, optional) – {‘Fairchild 2011’, ‘Fairchild 2010’}, Computation method.
Returns: hdr-IPT colourspace array.
Return type: ndarray
Notes
Domain Scale - Reference Scale - 1 XYZ
[0, 1] [0, 1] Y_s
[0, 1] [0, 1] Range Scale - Reference Scale - 1 IPT_hdr
I_hdr
: [0, 100]P_hdr
: [-100, 100]T_hdr
: [-100, 100]I_hdr
: [0, 1]P_hdr
: [-1, 1]T_hdr
: [-1, 1]- Input CIE XYZ tristimulus values needs to be adapted for CIE Standard Illuminant D Series D65.
References
Examples
>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952]) >>> XYZ_to_hdr_IPT(XYZ) # doctest: +ELLIPSIS array([ 48.3937634..., 42.4499020..., 22.0195403...]) >>> XYZ_to_hdr_IPT(XYZ, method='Fairchild 2010') # doctest: +ELLIPSIS array([ 30.0287314..., 83.9384506..., 34.9028738...])