colour.colorimetry.illuminants Module¶
Illuminants¶
Defines CIE illuminants computation related objects.
See also
Illuminants IPython Notebook colour.colorimetry.dataset.illuminants.d_illuminants_s_spds, colour.colorimetry.spectrum.SpectralPowerDistribution
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colour.colorimetry.illuminants.
D_illuminant_relative_spd
(xy)[source]¶ Returns the relative spectral power distribution of given CIE Standard Illuminant D Series using given xy chromaticity coordinates.
References
[1] Wyszecki, G., & Stiles, W. S. (2000). CIE Method of Calculating D-Illuminants. In Color Science: Concepts and Methods, Quantitative Data and Formulae (pp. 145–146). Wiley. ISBN:978-0471399186 [2] Lindbloom, B. (2007). Spectral Power Distribution of a CIE D-Illuminant. Retrieved April 05, 2014, from http://www.brucelindbloom.com/Eqn_DIlluminant.html Parameters: xy (array_like) – xy chromaticity coordinates. Returns: CIE Standard Illuminant D Series relative spectral power distribution. Return type: SpectralPowerDistribution Examples
>>> import numpy as np >>> xy = np.array([0.34567, 0.35850]) >>> D_illuminant_relative_spd(xy) <colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x...>