colour.characterisation.normalise_illuminant¶

colour.characterisation.normalise_illuminant(illuminant: colour.colorimetry.spectrum.SpectralDistribution, sensitivities: colour.characterisation.cameras.RGB_CameraSensitivities) → colour.colorimetry.spectrum.SpectralDistribution[source]¶

Normalise given illuminant with given camera RGB spectral sensitivities.

The multiplicative inverse scaling factor \(k\) is computed by multiplying the illuminant by the sensitivies channel with the maximum value.

Parameters

illuminant (colour.colorimetry.spectrum.SpectralDistribution) – Illuminant spectral distribution.
sensitivities (colour.characterisation.cameras.RGB_CameraSensitivities) – Camera RGB spectral sensitivities.

Returns

Normalised illuminant.

Return type

colour.SpectralDistribution

Examples

>>> path = os.path.join(
...     RESOURCES_DIRECTORY_RAWTOACES,
...     'CANON_EOS_5DMark_II_RGB_Sensitivities.csv')
>>> sensitivities = sds_and_msds_to_msds(
...     read_sds_from_csv_file(path).values())
>>> illuminant = SDS_ILLUMINANTS['D55']
>>> np.sum(illuminant.values)  
7276.1490000...
>>> np.sum(normalise_illuminant(illuminant, sensitivities).values)
... 
3.4390373...

colour.characterisation.white_balance_multipliers

colour.characterisation.training_data_sds_to_RGB