#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
DCI-P3 Colourspace
==================
Defines the *DCI-P3* colourspace opto-electrical transfer function
(OETF / OECF) and electro-optical transfer function (EOTF / EOCF):
- :func:`oetf_DCIP3`
- :func:`eotf_DCIP3`
See Also
--------
`RGB Colourspaces Jupyter Notebook
<http://nbviewer.jupyter.org/github/colour-science/colour-notebooks/\
blob/master/notebooks/models/rgb.ipynb>`_
References
----------
.. [1] Digital Cinema Initiatives. (2007). Digital Cinema System
Specification - Version 1.1. Retrieved from
http://www.dcimovies.com/archives/spec_v1_1/\
DCI_DCinema_System_Spec_v1_1.pdf
"""
from __future__ import division, unicode_literals
import numpy as np
__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013-2017 - Colour Developers'
__license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-science@googlegroups.com'
__status__ = 'Production'
__all__ = ['oetf_DCIP3',
'eotf_DCIP3']
[docs]def oetf_DCIP3(XYZ):
"""
Defines the *DCI-P3* colourspace opto-electronic transfer function
(OETF / OECF).
Parameters
----------
XYZ : numeric or array_like
*CIE XYZ* tristimulus values.
Returns
-------
numeric or ndarray
Non-linear *CIE XYZ'* tristimulus values.
Examples
--------
>>> oetf_DCIP3(0.18) # doctest: +ELLIPSIS
461.9922059...
"""
XYZ = np.asarray(XYZ)
return 4095 * (XYZ / 52.37) ** (1 / 2.6)
[docs]def eotf_DCIP3(XYZ_p):
"""
Defines the *DCI-P3* colourspace electro-optical transfer function
(EOTF / EOCF).
Parameters
----------
XYZ_p : numeric or array_like
Non-linear *CIE XYZ'* tristimulus values.
Returns
-------
numeric or ndarray
*CIE XYZ* tristimulus values.
Examples
--------
>>> eotf_DCIP3(461.99220597484737) # doctest: +ELLIPSIS
0.18...
"""
XYZ_p = np.asarray(XYZ_p)
return 52.37 * (XYZ_p / 4095) ** 2.6