THE FOURTH COLOUR FILTER OF TRISTIMULUS COLORIMETERS

Abstract

We have proved that the application of the tristimulus value Xz seems to be unnecessary. It can be suggested that the measuring of the tristimulus value Xz should be left and the sign X2 should be defined from the measured value Z on the base of the following connection: Z X.",,-- - 5,982 It would be more proper to neglect the use of the tristirnulus value X2 but this would need the total reconstructing of the CIE colour-system.