12 November 2010 Optical influence of different standard illuminants on green nephrite's color From Manasi
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To evaluate the optical influence of illuminant on green color with low chroma (C*≈1~12) of nephrite from Manasi, three different standard illuminant-daylight D65, incandescent light A and fluorescent light F2 (CWF) were applied during the experiment. Two-way ANOVA was used to analyze the illuminants tested considering the coordinates of lightness L* and chromaticity a*, b*. The results indicate significant differences for L*, a* and b* (p<0.05). Only L* between D65 and F2 didn't vary significantly (p=0.691) with the multiple comparisons (LSD- test). The green color with higher C*and L* were found to be easily influenced by illuminant, and the color-difference was larger and the color appearance varied more obviously while the illuminant as changed. The changes in color parameters and visual effects showed that the D65 light illuminant is more suitable for the evaluation of green nephrite's color grading while light source A can be used during trading.
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Hong-mei Du, Hong-mei Du, Ying Guo, Ying Guo, } "Optical influence of different standard illuminants on green nephrite's color From Manasi", Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 784411 (12 November 2010); doi: 10.1117/12.870663; https://doi.org/10.1117/12.870663


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