#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Ekta Space PS 5 Colourspace
===========================
Defines the *Ekta Space PS 5* colourspace:
- :attr:`EKTA_SPACE_PS_5_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] Holmes, J. (n.d.). Ekta Space PS 5. Retrieved from
http://www.josephholmes.com/Ekta_Space.zip
"""
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__ = ['EKTA_SPACE_PS_5_PRIMARIES',
'EKTA_SPACE_PS_5_V_ILLUMINANT',
'EKTA_SPACE_PS_5_WHITEPOINT',
'EKTA_SPACE_PS_5_TO_XYZ_MATRIX',
'XYZ_TO_EKTA_SPACE_PS_5_MATRIX',
'EKTA_SPACE_PS_5_TRANSFER_FUNCTION',
'EKTA_SPACE_PS_5_INVERSE_TRANSFER_FUNCTION',
'EKTA_SPACE_PS_5_COLOURSPACE']
EKTA_SPACE_PS_5_PRIMARIES = np.array(
[[0.6947368421052631, 0.30526315789473685],
[0.26000000000000001, 0.69999999999999996],
[0.10972850678733032, 0.0045248868778280547]])
"""
*Ekta Space PS 5* colourspace primaries.
EKTA_SPACE_PS_5_PRIMARIES : ndarray, (3, 2)
"""
EKTA_SPACE_PS_5_V_ILLUMINANT = 'D50'
"""
*Ekta Space PS 5* colourspace whitepoint name as illuminant.
EKTA_SPACE_PS_5_V_ILLUMINANT : unicode
"""
EKTA_SPACE_PS_5_WHITEPOINT = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get(EKTA_SPACE_PS_5_V_ILLUMINANT)
"""
*Ekta Space PS 5* colourspace whitepoint.
EKTA_SPACE_PS_5_WHITEPOINT : tuple
"""
EKTA_SPACE_PS_5_TO_XYZ_MATRIX = normalised_primary_matrix(
EKTA_SPACE_PS_5_PRIMARIES, EKTA_SPACE_PS_5_WHITEPOINT)
"""
*Ekta Space PS 5* colourspace to *CIE XYZ* colourspace matrix.
EKTA_SPACE_PS_5_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_EKTA_SPACE_PS_5_MATRIX = np.linalg.inv(EKTA_SPACE_PS_5_TO_XYZ_MATRIX)
"""
*CIE XYZ* colourspace to *Ekta Space PS 5* colourspace matrix.
XYZ_TO_EKTA_SPACE_PS_5_MATRIX : array_like, (3, 3)
"""
def _ekta_space_ps_5_transfer_function(value):
"""
Defines the *Ekta Space PS 5* colourspace transfer function.
Parameters
----------
value : numeric
Value.
Returns
-------
numeric
Companded value.
"""
return value ** (1 / 2.2)
def _ekta_space_ps_5_inverse_transfer_function(value):
"""
Defines the *Ekta Space PS 5* colourspace inverse transfer
function.
Parameters
----------
value : numeric
Value.
Returns
-------
numeric
Companded value.
"""
return value ** 2.2
EKTA_SPACE_PS_5_TRANSFER_FUNCTION = _ekta_space_ps_5_transfer_function
"""
Transfer function from linear to *Ekta Space PS 5* colourspace.
EKTA_SPACE_PS_5_TRANSFER_FUNCTION : object
"""
EKTA_SPACE_PS_5_INVERSE_TRANSFER_FUNCTION = (
_ekta_space_ps_5_inverse_transfer_function)
"""
Inverse transfer function from *Ekta Space PS 5* colourspace to linear.
EKTA_SPACE_PS_5_INVERSE_TRANSFER_FUNCTION : object
"""
EKTA_SPACE_PS_5_COLOURSPACE = RGB_Colourspace(
'Ekta Space PS 5',
EKTA_SPACE_PS_5_PRIMARIES,
EKTA_SPACE_PS_5_WHITEPOINT,
EKTA_SPACE_PS_5_V_ILLUMINANT,
EKTA_SPACE_PS_5_TO_XYZ_MATRIX,
XYZ_TO_EKTA_SPACE_PS_5_MATRIX,
EKTA_SPACE_PS_5_TRANSFER_FUNCTION,
EKTA_SPACE_PS_5_INVERSE_TRANSFER_FUNCTION)
"""
*Ekta Space PS 5* colourspace.
EKTA_SPACE_PS_5_COLOURSPACE : RGB_Colourspace
"""
Colour 0.3