#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
DCI-P3 & DCI-P3+ Colourspaces
=============================
Defines the *DCI-P3* and *DCI-P3+* colourspaces:
- :attr:`DCI_P3_COLOURSPACE`.
- :attr:`DCI_P3_p_COLOURSPACE`.
See Also
--------
`RGB Colourspaces IPython Notebook
<http://nbviewer.ipython.org/github/colour-science/colour-ipython/blob/master/notebooks/models/rgb.ipynb>`_ # noqa
References
----------
.. [1] Hewlett-Packard Development Company. (2009). Understanding the HP
DreamColor LP2480zx DCI-P3 Emulation Color Space. Retrieved from
http://www.hp.com/united-states/campaigns/workstations/pdfs/lp2480zx-dci--p3-emulation.pdf # noqa
.. [2] 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 # noqa
.. [3] Canon. (2014). EOS C500 Firmware Update. Retrieved January 14, 2015,
from http://www.usa.canon.com/cusa/professional/standard_display/cinema-firmware-c500 # noqa
"""
from __future__ import division, unicode_literals
import numpy as np
from colour.colorimetry import ILLUMINANTS
from colour.models import RGB_Colourspace, normalised_primary_matrix
__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013 - 2015 - Colour Developers'
__license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-science@googlegroups.com'
__status__ = 'Production'
__all__ = ['DCI_P3_PRIMARIES',
'DCI_P3_P_PRIMARIES',
'DCI_P3_ILLUMINANT',
'DCI_P3_WHITEPOINT',
'DCI_P3_TO_XYZ_MATRIX',
'XYZ_TO_DCI_P3_MATRIX',
'DCI_P3_P_TO_XYZ_MATRIX',
'XYZ_TO_DCI_P3_P_MATRIX',
'DCI_P3_TRANSFER_FUNCTION',
'DCI_P3_INVERSE_TRANSFER_FUNCTION',
'DCI_P3_COLOURSPACE',
'DCI_P3_P_COLOURSPACE']
DCI_P3_PRIMARIES = np.array(
[[0.680, 0.320],
[0.265, 0.690],
[0.150, 0.060]])
"""
*DCI-P3* colourspace primaries.
DCI_P3_PRIMARIES : ndarray, (3, 2)
"""
DCI_P3_P_PRIMARIES = np.array(
[[0.7400, 0.2700],
[0.2200, 0.7800],
[0.0900, -0.0900]])
"""
*DCI-P3+* colourspace primaries.
DCI_P3_P_PRIMARIES : ndarray, (3, 2)
"""
DCI_P3_ILLUMINANT = 'DCI-P3'
"""
*DCI-P3* colourspace whitepoint name as illuminant.
DCI_P3_ILLUMINANT : unicode
Warning
-------
DCI-P3 illuminant has no associated spectral power distribution. DCI has no
official reference spectral measurement for this whitepoint. The closest
matching spectral power distribution is Kinoton 75P projector.
"""
DCI_P3_WHITEPOINT = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get(DCI_P3_ILLUMINANT)
"""
*DCI-P3* colourspace whitepoint.
DCI_P3_WHITEPOINT : tuple
"""
DCI_P3_TO_XYZ_MATRIX = normalised_primary_matrix(
DCI_P3_PRIMARIES,
DCI_P3_WHITEPOINT)
"""
*DCI-P3* colourspace to *CIE XYZ* tristimulus values matrix.
DCI_P3_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_DCI_P3_MATRIX = np.linalg.inv(DCI_P3_TO_XYZ_MATRIX)
"""
*CIE XYZ* tristimulus values to *DCI-P3* colourspace matrix.
XYZ_TO_DCI_P3_MATRIX : array_like, (3, 3)
"""
DCI_P3_P_TO_XYZ_MATRIX = normalised_primary_matrix(
DCI_P3_P_PRIMARIES,
DCI_P3_WHITEPOINT)
"""
*DCI-P3+* colourspace to *CIE XYZ* tristimulus values matrix.
DCI_P3_P_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_DCI_P3_P_MATRIX = np.linalg.inv(DCI_P3_P_TO_XYZ_MATRIX)
"""
*CIE XYZ* tristimulus values to *DCI-P3+* colourspace matrix.
XYZ_TO_DCI_P3_P_MATRIX : array_like, (3, 3)
"""
def _dci_p3_transfer_function(value):
"""
Defines the *DCI-P3* colourspace transfer function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
value = np.asarray(value)
return 4095 * (value / 52.37) ** (1 / 2.6)
def _dci_p3_inverse_transfer_function(value):
"""
Defines the *DCI-P3* colourspace inverse transfer function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
value = np.asarray(value)
return 52.37 * (value / 4095) ** 2.6
DCI_P3_TRANSFER_FUNCTION = _dci_p3_transfer_function
"""
Transfer function from linear to *DCI-P3* colourspace.
DCI_P3_TRANSFER_FUNCTION : object
"""
DCI_P3_INVERSE_TRANSFER_FUNCTION = _dci_p3_inverse_transfer_function
"""
Inverse transfer function from *DCI-P3* colourspace to linear.
DCI_P3_INVERSE_TRANSFER_FUNCTION : object
"""
DCI_P3_COLOURSPACE = RGB_Colourspace(
'DCI-P3',
DCI_P3_PRIMARIES,
DCI_P3_WHITEPOINT,
DCI_P3_ILLUMINANT,
DCI_P3_TO_XYZ_MATRIX,
XYZ_TO_DCI_P3_MATRIX,
DCI_P3_TRANSFER_FUNCTION,
DCI_P3_INVERSE_TRANSFER_FUNCTION)
"""
*DCI-P3* colourspace.
DCI_P3_COLOURSPACE : RGB_Colourspace
"""
DCI_P3_P_COLOURSPACE = RGB_Colourspace(
'DCI-P3+',
DCI_P3_P_PRIMARIES,
DCI_P3_WHITEPOINT,
DCI_P3_ILLUMINANT,
DCI_P3_P_TO_XYZ_MATRIX,
XYZ_TO_DCI_P3_P_MATRIX,
DCI_P3_TRANSFER_FUNCTION,
DCI_P3_INVERSE_TRANSFER_FUNCTION)
"""
*DCI-P3+* colourspace.
DCI_P3_P_COLOURSPACE : RGB_Colourspace
"""
Colour 0.3