Hébert Mathieu, Hersch Roger D
Université de Lyon, Université Jean Monnet de Saint-Etienne, CNRS UMR5516 Laboratoire Hubert Curien, Saint-Etienne, France. mathieu.hebert@univ‐st‐etienne.fr
Appl Opt. 2011 Feb 1;50(4):519-25. doi: 10.1364/AO.50.000519.
The transmittance spectrum of halftone prints on paper is predicted thanks to a model inspired by the Yule-Nielsen modified spectral Neugebauer model used for reflectance predictions. This model is well adapted for strongly scattering printing supports and applicable to recto-verso prints. Model parameters are obtained by a few transmittance measurements of calibration patches printed on one side of the paper. The model was verified with recto-verso specimens printed by inkjet with classical and custom inks, at different halftone frequencies and on various types of paper. Predictions are as accurate as those obtained with a previously developed reflectance and transmittance prediction model relying on the multiple reflections of light between the paper and the print-air interfaces. Optimal n values are smaller in transmission mode compared with the reflection model. This indicates a smaller amount of lateral light propagation in the transmission mode.
得益于一个受用于反射率预测的尤尔 - 尼尔森修正光谱纽格鲍尔模型启发的模型，纸张上半色调印刷品的透射光谱得以预测。该模型非常适用于强散射印刷载体，并且适用于正反印刷。通过对印在纸张一侧的校准色块进行几次透射率测量来获得模型参数。该模型用喷墨打印机使用传统油墨和定制油墨在不同半色调频率下以及在各种类型的纸张上打印的正反样本进行了验证。预测结果与之前开发的依赖于纸张与印刷品 - 空气界面之间光的多次反射的反射率和透射率预测模型所获得的结果一样准确。与反射模型相比，透射模式下的最佳n值更小。这表明在透射模式下横向光传播量较少。
