摘要
从色度学角度出发,基于CIE 1976 L^*a^*b^*均匀色空间,在D65光源、CWF光源和A光源照射下对红-黄色翡翠样本的L^*、a^*、b^*值进行测量,计算出彩度值C^*.并结合统计分析证明A光源为红-黄色翡翠的最佳照明光源,D65标准照明光源可作为红-黄色翡翠的最佳评价光源.选取与标准光源箱表面灰度相同的孟塞尔中性背景N7色卡为最佳显色背景.实验结果表明,在D65光源与N7色卡背景下,通过K-means聚类分析,最终可将翡翠红-黄色分为七级.
Based on CIE 1976 L^*a^*b^*uniform color space,this program measured the L^*,a^*,b^*values of red-yellow jadeite-jade samples under the standard light sources D65,CWF,and A.And further,we calculated out the chroma value C^*.Combining the data with statistical analysis,we proved that for red-yellow jadeite-jade,A standard light source is the best lighting source,while D65 standard light source can be used as the best evaluation light source.We chose the N7 color card as the best color background,which owns the same gray level as the surface of the Standard illumination box.The results show that,under D65 standard light source,red-yellow jadeite-jade on N7 color card can be divided into seven grades through K-means clustering analysis.
作者
商嫣然
郭颖
刘航瑜
赵哲毅
周朵特
SHANG Yanran;GUO Ying;LIU Hangyu;ZHAO Zheyi;ZHOU Duote(College of Gemmology,China University of Geosciences,Beijing 100083,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2020年第4期539-544,共6页
Journal of Fuzhou University(Natural Science Edition)
基金
北京新金山基金资助项目(3-4-2019-045)。
关键词
红-黄色翡翠
光源选择
显色背景
颜色分级
red-yellow jadeite-jade
light source choice
color background
color grading
