Specification of colour rendering properties of light sources for colour television

Abstract

There is a need for ranking the colour rendering properties of light sources. These properties can be specified using the test colour method. Considering only ideal systems the ranking of 20 spectrally widely diverse light sources was determined. The ideal systems are not however representative of good practice. The incorporation of a linear matrix makes the practical system less sensitive to differences in chromaticity. Thus, scene illuminants with various colour temperatures may give good colour reproduction. The correlation between the rankings obtained with several practical systems increases as the systems give better colour reproduction of a scene under standard illumination. Therefore the ranking method should use only 'good practice' systems. It was found that a set of 16 test colours may be considered as representative of the total set of 39 test colours.