colour.colour_rendering_index

colour.colour_rendering_index(spd_test, additional_data=False)

Returns the Colour Rendering Index (CRI) \(Q_a\) of given spectral power distribution.

Parameters:

• spd_test (SpectralPowerDistribution) – Test spectral power distribution.
• additional_data (bool, optional) – Output additional data.

Returns:

Colour Rendering Index (CRI).

Return type:

numeric or CRI_Specification

References

• [OD08]

Examples

>>> from colour import ILLUMINANTS_RELATIVE_SPDS
>>> spd = ILLUMINANTS_RELATIVE_SPDS['F2']
>>> colour_rendering_index(spd)  
64.1515202...