#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Adobe RGB 1998 Colourspace
==========================
Defines the *Adobe RGB 1998* colourspace:
- :attr:`ADOBE_RGB_1998_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] Adobe Systems. (2005). Adobe RGB (1998) Color Image Encoding.
Retrieved from http://www.adobe.com/digitalimag/pdfs/AdobeRGB1998.pdf
"""
from __future__ import division, unicode_literals
import numpy as np
from colour.colorimetry import ILLUMINANTS
from colour.models import RGB_Colourspace
__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__ = ['ADOBE_RGB_1998_PRIMARIES',
'ADOBE_RGB_1998_ILLUMINANT',
'ADOBE_RGB_1998_WHITEPOINT',
'ADOBE_RGB_1998_TO_XYZ_MATRIX',
'XYZ_TO_ADOBE_RGB_1998_MATRIX',
'ADOBE_RGB_1998_TRANSFER_FUNCTION',
'ADOBE_RGB_1998_INVERSE_TRANSFER_FUNCTION',
'ADOBE_RGB_1998_COLOURSPACE']
ADOBE_RGB_1998_PRIMARIES = np.array(
[[0.6400, 0.3300],
[0.2100, 0.7100],
[0.1500, 0.0600]])
"""
*Adobe RGB 1998* colourspace primaries.
ADOBE_RGB_1998_PRIMARIES : ndarray, (3, 2)
"""
ADOBE_RGB_1998_ILLUMINANT = 'D65'
"""
*Adobe RGB 1998* colourspace whitepoint name as illuminant.
ADOBE_RGB_1998_ILLUMINANT : unicode
"""
ADOBE_RGB_1998_WHITEPOINT = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get(ADOBE_RGB_1998_ILLUMINANT)
"""
*Adobe RGB 1998* colourspace whitepoint.
ADOBE_RGB_1998_WHITEPOINT : tuple
"""
ADOBE_RGB_1998_TO_XYZ_MATRIX = np.array(
[[0.57666809, 0.18556195, 0.1881985],
[0.29734449, 0.62737611, 0.0752794],
[0.02703132, 0.07069027, 0.99117879]])
"""
*Adobe RGB 1998* colourspace to *CIE XYZ* tristimulus values matrix.
ADOBE_RGB_1998_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_ADOBE_RGB_1998_MATRIX = np.linalg.inv(ADOBE_RGB_1998_TO_XYZ_MATRIX)
"""
*CIE XYZ* tristimulus values to *Adobe RGB 1998* colourspace matrix.
XYZ_TO_ADOBE_RGB_1998_MATRIX : array_like, (3, 3)
"""
def _adobe_rgb_1998_transfer_function(value):
"""
Defines the *Adobe RGB 1998* colourspace transfer function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
value = np.asarray(value)
return value ** (1 / (563 / 256))
def _adobe_rgb_1998_inverse_transfer_function(value):
"""
Defines the *Adobe RGB 1998* colourspace inverse transfer function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
value = np.asarray(value)
return value ** (563 / 256)
ADOBE_RGB_1998_TRANSFER_FUNCTION = _adobe_rgb_1998_transfer_function
"""
Transfer function from linear to *Adobe RGB 1998* colourspace.
ADOBE_RGB_1998_TRANSFER_FUNCTION : object
"""
ADOBE_RGB_1998_INVERSE_TRANSFER_FUNCTION = (
_adobe_rgb_1998_inverse_transfer_function)
"""
Inverse transfer function from *Adobe RGB 1998* colourspace to linear.
ADOBE_RGB_1998_INVERSE_TRANSFER_FUNCTION : object
"""
ADOBE_RGB_1998_COLOURSPACE = RGB_Colourspace(
'Adobe RGB 1998',
ADOBE_RGB_1998_PRIMARIES,
ADOBE_RGB_1998_WHITEPOINT,
ADOBE_RGB_1998_ILLUMINANT,
ADOBE_RGB_1998_TO_XYZ_MATRIX,
XYZ_TO_ADOBE_RGB_1998_MATRIX,
ADOBE_RGB_1998_TRANSFER_FUNCTION,
ADOBE_RGB_1998_INVERSE_TRANSFER_FUNCTION)
"""
*Adobe RGB 1998* colourspace.
ADOBE_RGB_1998_COLOURSPACE : RGB_Colourspace
"""
Colour 0.3