目的 研究一种基于纸基光散射理论的网目调光学网点扩大算法。方法 应用点扩散函数和概率方法， 分析网目调印刷品中光的散射和渗透效应， 推导出印刷品上空白部分、 网点部分反射率和网目调印刷品反射率的精确表达式， 在此基础上， 分析了网点光学扩大与印刷品网点面积率、 墨层光谱透射率以及纸基光谱反射率的依赖关系， 建立了一种新的光学网点扩大算法模型。将经典的光谱Murray-Davis模型与该算法修正后的光谱Murray-Davis模型分别预测的光谱反射率， 与印刷品实际测量的光谱反射率作对比验证实验。 结果 提出算法修正后的光谱Murray-Davis模型与实测光谱反射率更加接近， 色差ΔE2000最高为1.53、 最低为0.89， 而人眼对ΔE2000＜2的颜色在视觉上近似相等。结论 采用提出的模型修正经典的Murray-Davis公式， 进而预测光谱反射率， 达到了很好的效果， 具有更高的精度。

To study a new algorithm for halftone optical dot gain based on the paper-based light scattering theory. Applying point spread function and probability methods, the light scattering and osmotic effect of halftone print were analyzed, and the exact expressions of the reflectivity of the blank part, the dot part and the halftone print were deduces. Furthermore, the dependence of the optical dot gain on the dot area coverage of the print, the ink layer spectral transmittance, and the paper-based spectral reflectivity was analyzed, and a new halftone optical dot gain algorithm model was established. Comparative verification experiments were conducted for the predicted spectral reflectivity and the measured spectral reflectivity of the print using the classical spectral Murray-Davis model and the Murray-Davis model amended using this algorithm. The Murray-Davis model amended using this algorithm gave a closer value with the measured spectral reflectivity, with a maximum chromatic aberration of max Δ E2000=1.53 and a minimum chromatic aberration of minΔE2000=0.89. For colors with ΔE2000＜2, the human eyes showed visual approximate equality. Using the classical Murray-Davis amended by the proposed model, better prediction results of spectral reflectivity were obtained, with higher accuracy.