利用由辨色阈值实验得到的CIELAB颜色空间中等明度a*-b*平面上的视觉数据,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,并采用性能因子PF/3来表示各色差公式的优劣。对于原始形式(kC=kH=1)的色差公式,CIEDE2000的色差预测性能最好,其次为CIE94和CMC,CIELAB最差。采用对kC和kH进行优化后的色差公式,CIEDE2000的色差预测性能依然最佳,其余三个色差公式的预测性能基本相同;除了CIELAB明显改善外,其他公式的色差预测性能只比原始形式略有提高。色差公式CIEDE2000在黄色和蓝色区域的色差预测性能表现优异,但在灰色、红色和绿色区域的预测性能仍有待进一步改进。

The visual data obtained from the color discrimination threshold experiment carried out in the iso-lightness a*-b* plane of CIELAB color space were used to test the four classical color-difference formulae, CIELAB, CMC, CIE94 and CIEDE2000, in terms of performance factor PF/3. For the original forms (kC=kH=1), CIEDE2000 outperformed others, followed by CIE94 and CMC, with CIELAB the worst.For the color-difference formulae with kC and kH optimized, CIEDE2000 still performed the best, while the color-difference prediction performances of other three formulae were almost the same; except for CIELAB improved obviously, others were enhanced a little in comparison with their individual original forms. The CIEDE2000 formula performed excellently in the yellow and blue color regions, but its color-difference prediction performances in the gray, red and green regions remained to be further improved.