Previous work has shown that tone reproduction characteristics of halftone images can be modeled with knowledge of the probability function P_(00), for light to reflect from the paper between the halftone dots after having entered the paper between the halftone dots. In the current report, experimental measurements of the micro-reflectance, R_p, of the paper between the dots is measured as a function of dot area fraction, F, and used with the model to calculate experimental values for P_(00) versus F. It is then shown that the model can be modified to account for inks that have significant scattering. The model is shown to fit data on halftones printed with electrophotography toner which is highly opaque. In addition, the model is further modified to account for the effects of the non-sharpness of the edges of halftone dots. Using both of these effects the model is shown to fit well with measured data from a variety of AM and FM halftones printed at different resolutions with different colorants. In addition, the model is shown to fit experimental data on the tone reproduction characteristics of a continuous tone, electrophotographic, office copy machine.
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机译：先前的研究表明，半色调图像的色调再现特征可以用概率函数 P_（00） 的知识来建模，即光在进入半色调点之间的纸张后从纸张反射。在本报告中，纸张在点之间的微反射率 R_p 的实验测量值是点面积分数 F 的函数，并与模型一起用于计算 P_（00） 与 F 的实验值。然后表明可以修改模型以考虑具有显着散射的油墨。该模型显示，该模型拟合使用高度不透明的电子照相碳粉印刷的半色调上的数据。此外，还对模型进行了进一步修改，以考虑半色调点边缘不清晰的影响。使用这两种效果，该模型与使用不同着色剂以不同分辨率打印的各种AM和FM半色调的测量数据非常吻合。此外，该模型还显示与连续音调、电子照相、办公室复印机的音调再现特性的实验数据拟合。
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