The Feasibility Study On Expressing The Color Of Green Jadeite-Jade By CIECAM02

This paper, by using CIECAM02 color appearance model, is to study the feasibility of forecasting green jade color appearance parameters while transforming observation conditions and the advantages of characterizing the green jade color by CIECAM02.Use Color i5 color measurement instrument measuring green jade XYZ values and CIE1976L^*a^*b^* chromaticity parameters L,a, b. Through the computer C language program the CIECAM02 color model to calculate the green jade color appearance parameters. Results show that the CIECAM02 color appearance model can predict green jade color appearance parameters while changing observing conditions such us environment (Average, Dim, Dark), standard light (D₆₅,D₅₀, A)and the intensity of illumination.The influence of Environmental conditions was greater than the intensity of illumination,especially on Lightness and Colorfulness instead of Hue. CIECAM02 color appearance model can predict complex color appearance phenomena, such as the visual color balance, the Helson-Judd effect, the hunt effect and the Stevens effect.CIECAM02 color appearance model can predict green jade color under different conditions while CIE1976L^*a^*b^* uniform color space only the specific condition. On the same condition,CIECAM02 color appearance model and CIE1976L^*a^*b^* uniform color space are comparative and the valueof Hue and Chroma are higher than theCIE1976L^*a^*b^*.As a result, CIECAM02 color appearance model is more suitable on predicting high chroma green jade color appearance under different environment conditions and different standard light and different illumination levels.