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This paper presents a new colour graphic informing on the colour rendition properties of light sources and glazing, in context. Instead of making predictions based on a predefined set of colour samples, the colour content of complex scenes is analysed. The main calculation steps of the proposed colour graphic are described with particular emphasis on the division of the colour space, based on colour naming, and on the processing of scenes’ achromatic content. Then, the paper illustrates the interest of the proposed method for assessing colour rendition of LED sources in comparison to the IES TM30-18 colour vector graphic for two complex scenes. The results show that even if for most sources the colour shift tendency predicted by both method is similar; some differences support the interest to use real scene colour content to characterize accurately colour rendering.

A COLOUR GRAPHIC FOR REAL COMPLEX SCENES: APPLICATION TO LED ILLUMINANTS