colour.colorimetry.dataset.lefs Module¶

Luminous Efficiency Functions Spectral Power Distributions¶

Defines various luminous efficiency functions involved in spectral computations.

The luminous efficiency data is in the form of a dict of colour.colorimetry.spectrum.SpectralPowerDistribution classes as follows:

{'name': SpectralPowerDistribution, ..., 'name': SpectralPowerDistribution}

The following luminous efficiency functions are available:

CIE 1924 Photopic Standard Observer [1]
Judd Modified CIE 1951 Photopic Standard Observer [1]
Judd-Vos Modified CIE 1978 Photopic Standard Observer [1]
CIE 1964 Photopic 10 Degree Standard Observer [2]
CIE 2008 2 Degree Physiologically Relevant LEF [3]
CIE 2008 10 Degree Physiologically Relevant LEF [3]
CIE 1951 Scotopic Standard Observer [1]

Notes

The luminous efficiency functions are provided at 1 nm steps.
The mesopic luminous efficiency function is calculated using the CIE 1924 Photopic Standard Observer and CIE 1951 Scotopic Standard Observer luminous efficiency functions with the colour.colorimetry.lefs.mesopic_luminous_efficiency_function() definition and the data from colour.colorimetry.dataset.lefs.MESOPIC_X_DATA attribute that defines weighting factors dependent on the photopic luminance \(L_p\). [3]

References

[1]	(1, 2, 3, 4) CVRL. (n.d.). Luminous efficiency. Retrieved April 19, 2014, from http://www.cvrl.org/lumindex.htm

[2]	CVRL. (n.d.). Older CIE Standards. Retrieved February 24, 2014, from http://cvrl.ioo.ucl.ac.uk/cie.htm

[3]	(1, 2, 3) Wikipedia. (n.d.). Mesopic weighting function. Retrieved June 20, 2014, from http://en.wikipedia.org/wiki/Mesopic_vision#Mesopic_weighting_function

colour.colorimetry.dataset.lefs.PHOTOPIC_LEFS = CaseInsensitiveMapping({u'CIE 1924 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeddd0>, u'CIE 1964 Photopic 10 Degree Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede90>, u'Judd-Vos Modified CIE 1978 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede50>, u'cie_10_1964': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede90>, u'Judd Modified CIE 1951 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede10>, u'CIE 2008 10 Degree Physiologically Relevant LEF': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf10>, u'CIE 2008 2 Degree Physiologically Relevant LEF': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeded0>, u'cie_2_1924': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeddd0>})¶

Photopic luminous efficiency functions.

PHOTOPIC_LEFS : CaseInsensitiveMapping: {‘CIE 1924 Photopic Standard Observer’, ‘Judd Modified CIE 1951 Photopic Standard Observer’, ‘Judd-Vos Modified CIE 1978 Photopic Standard Observer’, ‘CIE 1964 Photopic 10 Degree Standard Observer’, ‘CIE 2008 2 Degree Physiologically Relevant LEF’, ‘CIE 2008 10 Degree Physiologically Relevant LEF’}

Aliases:

‘cie_2_1924’: ‘CIE 1931 2 Degree Standard Observer’
‘cie_10_1964’: ‘CIE 1964 Photopic 10 Degree Standard Observer’

colour.colorimetry.dataset.lefs.SCOTOPIC_LEFS = CaseInsensitiveMapping({u'cie_1951': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf90>, u'CIE 1951 Scotopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf90>})¶

Scotopic luminous efficiency functions.

SCOTOPIC_LEFS : CaseInsensitiveMapping: {‘CIE 1951 Scotopic Standard Observer’,}

Aliases:

‘cie_1951’: ‘CIE 1951 Scotopic Standard Observer’

colour.colorimetry.dataset.lefs.LEFS = CaseInsensitiveMapping({u'CIE 1924 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeddd0>, u'CIE 1964 Photopic 10 Degree Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede90>, u'cie_1951': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf90>, u'Judd-Vos Modified CIE 1978 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede50>, u'cie_10_1964': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede90>, u'Judd Modified CIE 1951 Photopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aede10>, u'CIE 1951 Scotopic Standard Observer': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf90>, u'CIE 2008 10 Degree Physiologically Relevant LEF': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aedf10>, u'CIE 2008 2 Degree Physiologically Relevant LEF': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeded0>, u'cie_2_1924': <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x2b3679aeddd0>})¶

Aggregated luminous efficiency functions.

LEFS : CaseInsensitiveMapping: {‘CIE 1924 Photopic Standard Observer’, ‘Judd Modified CIE 1951 Photopic Standard Observer’, ‘Judd-Vos Modified CIE 1978 Photopic Standard Observer’, ‘CIE 1964 Photopic 10 Degree Standard Observer’, ‘CIE 2008 2 Degree Physiologically Relevant LEF’, ‘CIE 2008 10 Degree Physiologically Relevant LEF’, ‘CIE 1951 Scotopic Standard Observer’}

colour.colorimetry.dataset.lefs.MESOPIC_X_DATA = {1.0: CaseInsensitiveMapping({u'Red Heavy': CaseInsensitiveMapping({u'LRC': 1.0, u'MOVE': 0.68}), u'Blue Heavy': CaseInsensitiveMapping({u'LRC': 1.0, u'MOVE': 0.7})}), 10: CaseInsensitiveMapping({u'Red Heavy': CaseInsensitiveMapping({u'LRC': 1.0, u'MOVE': 0.98}), u'Blue Heavy': CaseInsensitiveMapping({u'LRC': 1.0, u'MOVE': 0.98})}), 0.1: CaseInsensitiveMapping({u'Red Heavy': CaseInsensitiveMapping({u'LRC': 0.11, u'MOVE': 0.34}), u'Blue Heavy': CaseInsensitiveMapping({u'LRC': 0.28, u'MOVE': 0.42})}), 0.01: CaseInsensitiveMapping({u'Red Heavy': CaseInsensitiveMapping({u'LRC': 0.01, u'MOVE': 0.0}), u'Blue Heavy': CaseInsensitiveMapping({u'LRC': 0.04, u'MOVE': 0.13})})}¶

Weighting factors for the mesopic luminous efficiency function calculation.

MESOPIC_X_DATA : CaseInsensitiveMapping