colour.colour_rendering_index

colour.colour_rendering_index(sd_test: colour.colorimetry.spectrum.SpectralDistribution, additional_data: bool = False) → float | colour.quality.cri.ColourRendering_Specification_CRI

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

Parameters

• sd_test (colour.colorimetry.spectrum.SpectralDistribution) – Test spectral distribution.

• additional_data (bool) – Whether to output additional data.

Returns

Colour Rendering Index (CRI).

Return type

float or colour.quality.ColourRendering_Specification_CRI

References

[OD08]

Examples

>>> from colour import SDS_ILLUMINANTS
>>> sd = SDS_ILLUMINANTS["FL2"]
>>> colour_rendering_index(sd)  
64.2337241...