Quality evaluation of tourmaline red based on uniform color space

摘要

AbstractBased on the uniform color space$$hbox {CIE},1976hbox {L}^{{*}}hbox {a}^{{*}}hbox {b}^{{*}},$$CIE1976L?a?b?,the red colors of 310 tourmalines were conducted with the research of color colorimetry. In terms of the quantitative analysis of color indexes such as lightness, chroma and color hue, we put forward the eight-class five-level systems for quality evaluation of tourmaline red by K-Means cluster analysis. The systems were sorted from superior to inferior: Fancy Vivid, Fancy Intense, Fancy Deep, Fancy and Fancy Dark. Through Fisher discriminant, the accuracy was proved to be up to 98.7%. Furthermore, we analyzed the effects of different standard light sources (D$$_{65},$$65,A and CWF) on tourmaline red in detail. It was pointed out that D