背衬对计算机配色精度的影响

在具有一定不透明度的纸张上建立配色数据库及预测配方时，选取不同的背衬会得到不同颜色 测量结果，影响配色模型的参数，进而得到不同的配色精度。因此，为保证配色的准确性，需规范测色 背衬的选取。在计算机配色过程中，使用符合ISO 13655—2017规定的常用标准黑背衬和标准白背衬进行 对比研究，分析在黑、白不同背衬下，几种常见印刷介质上的配色精度。研究结果表明，在3种介质上配 方与目标色的平均色差，垫黑时为2.575，垫白时为3.553，因此计算机配色在标准黑背衬条件下展现出 更加优越的配色精度，建议在配色过程中选用黑色背衬。

Effect of Backing on Spot-Color Ink Matching Accuracy

When color matching database was established and formulation was predicted on the paper with certain opacity, different measurement results were obtained by selecting different color backing, which affected the parameters of color matching model and color matching accuracy. Therefore, in order to ensure the accuracy of color matching, it was necessary to standardize the selection of backing. The color matching accuracy on some common substrates such as white card paper, coated card paper and parchment paper was analyzed on ISO 13655 standard black backing and standard white backing. The results showed that the color matching results on standard black backing were more accurate on substrates, among which the average color difference between the formulation and the target color was 2.575 on black backing, and 3.553 on white backing. It was recommended to match the color on the black backing.