通过翡翠绿色的色差计算,分析明度差DL、彩度差DC、色调差DH对综合色差DE的贡献.采用CIE L*a*b*均匀色空间中CIE LAB色差公式的计算结果显示,肉眼下66粒质地细腻、绿色均匀的优质翡翠戒面的明度值L*∈(38.50,61.80),属中等偏低的明亮程度;彩度范围C*∈(11.49,44.99),也属中等偏低;色调范围h0∈(134.32,152.96),属略带黄色调的鲜艳绿色.翡翠绿色的平均色差DELAB-AVE=6.10达肉眼可识别级别,平均饱和度差-0.22与平均色调角差0.06均很低,对总色差贡献不大,而明度差DL则表现出了与总色差很高的一致性.得出结论,对中低明度的翡翠绿色色差的最直接贡献者为其明度差,依此建议采用首先以彩度和色调的二元体系作为翡翠绿色定量分级体系,进而依据三维均匀色空间模型CIE L*a*b*,构建以色差为基本单位,明度为Z轴、彩度为X轴和色调为Y轴的三元质量分级体系.
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