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Measuring colour rendering - a new approach II

Pointer, M R (2004) Measuring colour rendering - a new approach II. NPL Report. DQL-OR 007

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Abstract

Following a summary of the status of the current CIE Colour-Rendering Index, this report presents a method of measuring a coloured sample giving numbers which correlate highly with the appearance of that sample when it is viewed under a defined illuminant. It is shown how these numbers, relating to the hue, lightness, and chroma of the sample, can be combined to provide a measure of the differences between a set of coloured samples viewed first under a reference lamp and then under a test lamp. Four hue/lightness/chroma indices are calculated for each of the four unique hues, red, yellow, green, and blue. These indices are combined to give mean hue, lightness and chroma indices, and an overall index. This final index may be considered analogous to the present CIE colour-rendering index. The procedure was first published in 1986 and the opportunity has been taken to revise the philosophy behind the method and to implement the use of the latest CIE recommendation on colour appearance models.

Item Type: Report/Guide (NPL Report)
NPL Report No.: DQL-OR 007
Keywords: colour appearance
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Materials and Appearance
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/3090

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