透射法在山东蓝宝石颜色量化中的应用（下）

山东蓝宝石在反射光下近黑色,无法适应国际上较通用的有色宝石品质分级体系。文章根据该产地蓝宝石的颜色特征,通过对比实验探讨最佳颜色测试方法,为山东蓝宝石颜色分级体系的建立提供理论支持。研究表明：透射法测试能更好地表征与区分蓝宝石的颜色。本实验根据色度学原理,以CIE1976Lab均匀色空间为载体,对透射条件下山东蓝宝石的颜色参数（明度、色调、饱和度）进行量化分析,为山东蓝宝石颜色分级体系的建立提供参考。

Application of transmission method in color quantization of sapphire from Shandong

The sapphire from Shandong is near black under the reflected light,which lead it unable to adopting general international quality grading systems of colored gemstones.Based on the color characteristics of the local sapphire,this article discussed the best test method of color to provide a theoretical support for establishing the color grading system of Shandong sapphire by contrast experiments.The experiment showed that the transmitted light method is a better choice to characterize and distinguish the color of sapphire.Based on principles of colorimetry,the research quantified three color parameters（brightness,hue and saturation） to analyze the color of sapphire from Shandong under the transmitted light and CIE1976Lab uniform color space,which provide a reference to establish a system about Shandong sapphire color grading.