为更好地研究光学变色油墨的显色性能，加大其在半色调印刷品防伪领域的应用，在分析光学变色油墨变色原理的基础上，着重分析了光变油墨中的薄膜理论，由此建立了一个统一的光学油墨半色调印刷品的光谱反射率预测模型。模型能够很好地预测防伪印刷品和油墨的颜色变化，从而为光变油墨的光谱分析提供了很好的理论依据，能更好地控制防伪油墨的颜色变化。

Color change theory of OVI was analyzed with emphases on the film theory of OVI. A general spectral reflectance prediction model for halftones prints of OVI was established based on the analysis. The model can better predict the color of anti-forgery printed matter and ink, so as to provide a theoretical criterion for spectral analysis of OVI and to better control the color change of anti-forgery ink.