A tea leaf color measurement system was established by using the scanner, color picker tool ColorPix and RGB color rules. The value of color difference was converted into CIELab color system parameters by the online tool ColorHexa and then the leaf colors of Typical Green, Yellow and Purple tea Germplasms were comparative analyzed through circular direction and radial direction methods. The results showed that the single leaf multi - point repeat value in radial measurement and the mid-ring position value in circular method had similar leaf color characterization. The 120 tea germplasms were randomly selected and measured for the brightness L* and chromatic components a* and b*. The values of lightness L* and color difference a* and b* between the two methods were significantly and positively correlated. However, when the facilitation and the efficiency of analysis were taken into consideration, it is better to use the color value in the mid-ring position by circular direction method. When the leaf color values of 120 germplasms were measured in the mid-ring position to draw the three-dimensional scatter plots, the mauve color group was effectively separated from the purple germplasms, which further proved the efficiency of the method to accurately identify specific leaf color germplasm.%采用扫描仪、测色器ColorPix和RGB颜色系统建立测色装置,并利用在线工具ColorHexa将色差指标值转换成CIELab颜色体系参数,对绿、黄、紫色系典型茶树种质进行环向和径向测色法比较分析.结果表明,径向测定法采用单叶多点重复取值与环向测定法中环位取值具有相近叶色表征作用.通过对120个不同叶色种质的径向多点位重复测定和环向中环位测定,2种方法的明度L*、色差指标值a*和b*显著正相关.但是,考虑到使用的简便性与分析效率,提出用环向中环位测定值定义叶色更为合适.对上述120个供试茶树种质的环向中环位叶色测定值构成的三维散点图进行分析,发现能够将紫红色种质与紫色系种质有效分离,更进一步证明该技术在特异叶色种质精准鉴别中具有实用价值.
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