在喷墨打印机喷出墨滴大小可变时，以Clapper-Yule模型为基础，研究了可变墨滴喷墨打印印刷品的反射率预测模型。首先引入了墨滴大小变化和Clapper-Yule模型的调频加网形式；然后，用墨滴变化引起的墨层厚度变化和调频网点大小的变化扩展Clapper-Yule模型；最后，建立了墨滴大小扩展的Clapper-Yule模型，并通过模拟实验验证了模型的优越性。

Reflectance prediction model for variable dot-size ink jet presswork was studied based on Clapper-Yule model. At first, variable drop size and the FM screening form of Clapper-Yule model were introduced; then, Clapper-Yule model was extended using the change of ink film thickness and FM screening dot, which were caused by drop change; at last, the extended Clapper-Yule model with ink drop size was established. The advantage of the model was validated with simulation.