This standard specifies about the specification of colours according to XYZ colorimetric system(1) (indicated as XYZ colorimetric system from now on) based on between 2 degree and X10Y10Z10 colorimetric system(2) (indicated as X10Y10Z10 colorimetric system from now on) based on 10 degree of a visual field.
Footnoted) Colorimetric system that Commission Internationale de I'Eclairage (CIE stands for the Commission Internationale de I'Eclairage) encourages in 1931. (2) Colorimetric system that CIE encourages in 1964.
Remarks 1. When the angle that XYZ colorimetric system and X10Y10Z10 colorimetric system spread to observer's eyes is each 1 ~4 ° and exceed 4 °, good correlation can be obtained about luminous colour matching in visual field. 2. Specification of colours specified in this standard is consistent with specification of colours decided in Publication CIE 15.2 (1986) COLORIMETRY, SECOND EDITION (so called as CIE 15.2 from now on) that CIE encourages in 1986.