利用由对印刷样品恰可察觉小色差的辨色阈值实验得到的CIELAB 颜色空间中的视觉数据,对四个典型色差公式CIELAB、CMC、CIE94 和CIEDE2000 在辨色阈值水平上的色差预测性能进行测试和评价。不同色差公式计算的印刷样品不同颜色区域的恰可辨别小色差阈值不同, 色差公式CIELAB除在灰色区域色差阈值低于其余典型色差公式外, 在其他颜色区域均高于典型色差公式。对于原始形式(kL=kC=kH=1)的色差公式,CIEDE2000与人眼的视觉匹配程度最好; 采用对kC∶kH 进行优化后的CIEDE2000色差公式,色差预测性能在颜色空间均有不同程度的改善, 其中对灰色和高彩橙颜色区域的性能改善最大。

The visual data, obtained from the just-noticeable color difference discrimination threshold experiment carried out in CIELAB color space, were used to test the four classical color-difference formulae, CIELAB, CMC,CIE94 and CIEDE2000. The just-noticeable color difference discrimination thresholds of the printed samples’ different color regions calculated by different formulae are different. Except for the grey color region,the CIELAB color-difference is higher than others. For the original forms (kL=kC=kH=1), CIEDE2000 ouerforms others with the best matching with visual evaluation. For the color-difference formulae with optimized kC and kH, the optimized form of CIEDE2000 performs the best especially in the color region of grey and high chroma orange.