#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Chromatic Adaptation Transforms
===============================
Defines various chromatic adaptation transforms (CAT):
- :attr:`XYZ_SCALING_CAT`: XYZ Scaling CAT [1]_
- :attr:`VON_KRIES_CAT`: Von Kries CAT [1]_
- :attr:`BRADFORD_CAT`: Bradford CAT [1]_
- :attr:`SHARP_CAT`: Sharp CAT [4]_
- :attr:`FAIRCHILD_CAT`: Fairchild CAT [2]_
- :attr:`CMCCAT97_CAT`: CMCCAT97 CAT [5]_
- :attr:`CMCCAT2000_CAT`: CMCCAT2000 CAT [5]_
- :attr:`CAT02_CAT`: CAT02 CAT [3]_
- :attr:`CAT02_BRILL_CAT`: Brill and Süsstrunk (2008) corrected CAT02
CAT [6]_ [7]_
- :attr:`BS_CAT`: Bianco and Schettini (2010) CAT [4]_
- :attr:`BS_PC_CAT`: Bianco and Schettini PC (2010) CAT [4]_
See Also
--------
`Chromatic Adaptation IPython Notebook
<http://nbviewer.ipython.org/github/colour-science/colour-ipython/blob/master/notebooks/adaptation/vonkries.ipynb>`_ # noqa
References
----------
.. [1] Lindbloom, B. (2009). Chromatic Adaptation. Retrieved February 24,
2014, from http://brucelindbloom.com/Eqn_ChromAdapt.html
.. [2] Fairchild, M. D. (n.d.). Fairchild YSh. Retrieved from
http://rit-mcsl.org/fairchild//files/FairchildYSh.zip
.. [3] Wikipedia. (n.d.). CAT02. Retrieved February 24, 2014,
from http://en.wikipedia.org/wiki/CIECAM02#CAT02
.. [4] Bianco, S., & Schettini, R. (2010). Two New von Kries Based Chromatic
Adaptation Transforms Found by Numerical Optimization. Color Research
& Application, 35(3), 184–192. doi:10.1002/col.20573
.. [5] Westland, S., Ripamonti, C., & Cheung, V. (2012). CMCCAT97. In
Computational Colour Science Using MATLAB (2nd ed., p. 80).
ISBN:978-0-470-66569-5
.. [6] Brill, M. H., & Süsstrunk, S. (2008). Repairing gamut problems in
CIECAM02: A progress report. Color Research & Application, 33(5),
424–426. doi:10.1002/col.20432
.. [7] Li, C., Perales, E., Luo, M. R., & Martínez-verdú, F. (2007). The
Problem with CAT02 and Its Correction, (July), 1–10.
"""
from __future__ import division, unicode_literals
import numpy as np
from colour.utilities import CaseInsensitiveMapping
__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013 - 2014 - Colour Developers'
__license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-science@googlegroups.com'
__status__ = 'Production'
__all__ = ['XYZ_SCALING_CAT',
'VON_KRIES_CAT',
'BRADFORD_CAT',
'SHARP_CAT',
'FAIRCHILD_CAT',
'CMCCAT97_CAT',
'CMCCAT2000_CAT',
'CAT02_CAT',
'CAT02_BRILL_CAT',
'BS_CAT',
'BS_PC_CAT',
'CHROMATIC_ADAPTATION_TRANSFORMS']
XYZ_SCALING_CAT = np.array(np.identity(3)).reshape((3, 3))
"""
XYZ Scaling chromatic adaptation transform. [1]_
XYZ_SCALING_CAT : array_like, (3, 3)
"""
VON_KRIES_CAT = np.array(
[[0.4002400, 0.7076000, -0.0808100],
[-0.2263000, 1.1653200, 0.0457000],
[0.0000000, 0.0000000, 0.9182200]])
"""
Von Kries chromatic adaptation transform. [1]_
VON_KRIES_CAT : array_like, (3, 3)
"""
BRADFORD_CAT = np.array(
[[0.8951000, 0.2664000, -0.1614000],
[-0.7502000, 1.7135000, 0.0367000],
[0.0389000, -0.0685000, 1.0296000]])
"""
Bradford chromatic adaptation transform. [1]_
BRADFORD_CAT : array_like, (3, 3)
"""
SHARP_CAT = np.array(
[[1.2694, -0.0988, -0.1706],
[-0.8364, 1.8006, 0.0357],
[0.0297, -0.0315, 1.0018]])
"""
Sharp chromatic adaptation transform. [4]_
SHARP_CAT : array_like, (3, 3)
"""
FAIRCHILD_CAT = np.array(
[[0.8562, 0.3372, -0.1934],
[-0.8360, 1.8327, 0.0033],
[0.0357, -0.0469, 1.0112]])
"""
Fairchild chromatic adaptation transform. [2]_
FAIRCHILD_CAT : array_like, (3, 3)
"""
CMCCAT97_CAT = np.array(
[[0.8951, -0.7502, 0.0389],
[0.2664, 1.7135, 0.0685],
[-0.1614, 0.0367, 1.0296]])
"""
CMCCAT97 chromatic adaptation transform. [5]_
CMCCAT97_CAT : array_like, (3, 3)
"""
CMCCAT2000_CAT = np.array(
[[0.7982, 0.3389, -0.1371],
[-0.5918, 1.5512, 0.0406],
[0.0008, 0.0239, 0.9753]])
"""
CMCCAT2000 chromatic adaptation transform. [5]_
CMCCAT2000_CAT : array_like, (3, 3)
"""
CAT02_CAT = np.array(
[[0.7328, 0.4296, -0.1624],
[-0.7036, 1.6975, 0.0061],
[0.0030, 0.0136, 0.9834]])
"""
CAT02 chromatic adaptation transform. [3]_
CAT02_CAT : array_like, (3, 3)
"""
CAT02_BRILL_CAT = np.array(
[[0.7328, 0.4296, -0.1624],
[-0.7036, 1.6975, 0.0061],
[0.0000, 0.0000, 1.0000]])
"""
Brill and Süsstrunk (2008) corrected CAT02 chromatic adaptation
transform. [6]_ [7]
CAT02_BRILL_CAT : array_like, (3, 3)
"""
BS_CAT = np.array(
[[0.8752, 0.2787, -0.1539],
[-0.8904, 1.8709, 0.0195],
[-0.0061, 0.0162, 0.9899]])
"""
Bianco and Schettini (2010) chromatic adaptation transform. [4]_
BS_CAT : array_like, (3, 3)
"""
BS_PC_CAT = np.array(
[[0.6489, 0.3915, -0.0404],
[-0.3775, 1.3055, 0.0720],
[-0.0271, 0.0888, 0.9383]])
"""
Bianco and Schettini PC (2010) chromatic adaptation transform. [4]_
BS_PC_CAT : array_like, (3, 3)
Notes
-----
- This chromatic adaptation transform has no negative lobes.
"""
CHROMATIC_ADAPTATION_TRANSFORMS = CaseInsensitiveMapping(
{'XYZ Scaling': XYZ_SCALING_CAT,
'Von Kries': VON_KRIES_CAT,
'Bradford': BRADFORD_CAT,
'Sharp': SHARP_CAT,
'Fairchild': FAIRCHILD_CAT,
'CMCCAT97': CMCCAT97_CAT,
'CMCCAT2000': CMCCAT2000_CAT,
'CAT02': CAT02_CAT,
'CAT02_BRILL_CAT': CAT02_BRILL_CAT,
'Bianco': BS_CAT,
'Bianco PC': BS_PC_CAT})
"""
Supported chromatic adaptation transforms.
CHROMATIC_ADAPTATION_TRANSFORMS : CaseInsensitiveMapping
{'XYZ Scaling', 'Von Kries', 'Bradford', 'Sharp', 'CMCCAT97', 'CMCCAT2000',
'Fairchild, 'CAT02', 'CAT02_BRILL_CAT', 'Bianco', 'Bianco PC'}
"""
Colour 0.3