More details on terms, standards, and color spaces discussed in this booklet. 2 Standard Observer and 10 Supplementary Standard Observer / Color-Matching Functions XYZ Tristimulus Value (CIE 1931) / Tristimulus Value (CIE 1964) xyz Chromaticity Coodinates / xy and Chromaticity Diagram L*a*b* Color Space / Uniform Color Space L*C*h Color Space Hunter Lab Color Space / Munsell Color Space L*u*v* Color Space CIE 1976 UCS Diagram / ∆E*94 Color difference formula (CIE 1994) CIE 2000 Color Difference Formula Difference Between Object Color and Source Color ··· I Difference Between Object Color and Source Color ··· II Illuminance and Luminance