为研究普通彩色喷墨打印机的颜色特性化，分析了打印过程中的两个主要步骤，即墨水分色过程和介质上的呈色过程，并提出较为精确的光谱预测模型。呈色过程采用基于简单点增益的(YNSN)模型和基于复杂点增益的改进型YNSN模型。为解决打印机的墨水分色无法直接控制的问题，构造了色度误差目标函数，利用非线性优化求解图像红绿蓝数值对应的青、品红、黄、黑(CMYK)喷墨量，并建立两者间的多项式回归关系。实验结果表明，进行非线性分色处理的模型能较好地预测打印的光谱和色度，相对于简单分色模型，其色度精度有明显提高。

A novel color characterization method for general colorful inkjet printers is proposed. The method investigates the printer color separation and medium color rendering processes, based on which spectral reflectance can be predicted. The Yule-Nielsen special Neugebauer (YNSN) and enhanced YNSN models, which are based on simple and complicated dot gain respectively, are employed in the printer color separation process. As the color separation cannot be directly controlled, the colorimetric error objective function is designed. The mapping between RGB and CMYK is modeled using polynomial regression, and is resolved by nonlinear optimization. Experiment results show that the proposed method can characterize the color printer accurately. In comparison with existing techniques using simple color separation model, the proposed method produces improved colorimetric accuracy.