colour.colorimetry.photometry Module¶
Photometry¶
Defines photometric quantities computation related objects.
See also
References
[1] | Wikipedia. (n.d.). Luminosity function. Retrieved October 20, 2014, from https://en.wikipedia.org/wiki/Luminosity_function#Details |
[2] | Ohno, Y., & Davis, W. (2008). NIST CQS simulation 7.4. Retrieved from http://cie2.nist.gov/TC1-69/NIST CQS simulation 7.4.xls |
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colour.colorimetry.photometry.
luminous_flux
(spd, lef=<colour.colorimetry.spectrum.SpectralPowerDistribution object>, K_m=683)[source]¶ Returns the luminous flux for given spectral power distribution using the given luminous efficiency function.
Parameters: - spd (SpectralPowerDistribution) – test spectral power distribution
- lef (SpectralPowerDistribution, optional) – \(V(\lambda)\) luminous efficiency function.
- K_m (numeric, optional) – \(lm\cdot W^{-1}\) maximum photopic luminous efficiency
Returns: Luminous flux
Return type: numeric
Examples
>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS >>> spd = LIGHT_SOURCES_RELATIVE_SPDS.get('Neodimium Incandescent') >>> luminous_flux(spd) 23807.6555273...
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colour.colorimetry.photometry.
luminous_efficacy
(spd, lef=<colour.colorimetry.spectrum.SpectralPowerDistribution object>)[source]¶ Returns the luminous efficacy for given spectral power distribution using the given luminous efficiency function.
Parameters: - spd (SpectralPowerDistribution) – test spectral power distribution
- lef (SpectralPowerDistribution, optional) – \(V(\lambda)\) luminous efficiency function.
Returns: Luminous efficacy
Return type: numeric
Examples
>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS >>> spd = LIGHT_SOURCES_RELATIVE_SPDS.get('Neodimium Incandescent') >>> luminous_efficacy(spd) 0.1994393...