锰铝榴石的颜色三要素特征

The Characteristics of Three Elements of Spessartine Color

为促进锰铝榴石分级标准的建立和完善,本文从市场中选取38颗颜色由深橙红向浅橙色过渡的锰铝榴石样品,通过紫外—可见光分光光度计测试分析其光谱特征,利用X-Rite SP62积分球式分光光度计测量样品的颜色数据,并基于CIE 1976 L^*a^*b^*均匀色空间对样品颜色进行定量表征,分析其颜色特征,为锰铝榴石的颜色质量评价提供一定的理论依据。通过统计学分析,得出样品C^*值与b^*的相关系数r为0.927,说明锰铝榴石的彩度随黄色饱和度的增大而增大;样品h°值与b^*值的相关系数r为0.896,说明锰铝榴石的色调角随黄色饱和度的增大而增大;样品L^*值与h°值的相关系数r为0.949,说明锰铝榴石的明度随色调角的增大而增大。

In order to promote the establishment and improvement of the classification standard of spessartine,this paper selected 38 samples of spessartine from market,whose colors vary from deep orange red to light orange.The experiment used ultraviolet-visible spectroscopy testing to analyze the optical spectra,and used X-Rite SP62 spectrophotometer to measure the color of the samples.Quantitative characterization of the color of the samples based on the CIE 1976 L^*a^*b^* uniform color space are used to analyze its color characteristics,so as to provide a certain theoretical basis for the color quality evaluation of spessartine.According to statistical analysis,the Pearson correlation coefficient(r)between C^* value and b^* value of samples is 0.927,indicating that the chroma of spessartine increases as its yellow saturation increases.The r value between h° value and b^* value of samples is 0.896,indicating that the hue angle of spessartine increases as its yellow saturation increases.The r value between L^* value and h° value of samples is 0.949,indicating that the lightness of spessartine increases as its hue angle increases.