Full Description

This CIE Standard replaces ISO/CIE 10527:1991. This Standard contains only minorchanges from the previous Standard, it has now been clarified that the values of thecolour matching functions apply for standard air to make the Standard conform toother CIE photometric and colorimetric data.

Colours with different spectral compositions can look alike. An importantfunction of colorimetry is to determine whether a pair of such metameric colours willlook alike. It has long been the practice in colorimetry to make use of sets of colourmatchingfunctions to calculate tristimulus values for colours: equality of tristimulusvalues for a pair of colours indicates that the colour appearances of the two coloursmatch, when they are viewed in the same conditions by an observer for whom thecolour-matching functions apply. The use of standard sets of colour-matchingfunctions makes the comparison of tristimulus values obtained at different times andlocations possible.

This International Standard specifies colour-matching functions for use incolorimetry. Two sets of colour-matching functions are specified:Colour-matching functions for the CIE 1931 standard colorimetric observerThis set of colour-matching functions is representative of the colour-matchingproperties of observers with normal colour vision for visual field sizes of angularsubtense from about 1 to about 4, for vision at photopic levels of adaptation.Colour-matching functions for the CIE 1964 supplementary standard colorimetricobserver.

This set of colour-matching functions is representative of the colour-matchingproperties of observers with normal colour vision for visual field sizes of angularsubtense greater than about 4, for vision at sufficiently high photopic levelsand with spectral power distributions such that no participation of the rodreceptors of the retina is to be expected. The values in the tables of the colour matching functions and chromaticity coordinates of the CIE 1931 and 1964 standard colorimetric observers are identicalwith those in the previous standard.

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Published: 12/01/2007