Machizaud Jacques, Hébert Mathieu
Université de Lyon, Université Jean-Monnet de Saint-Etienne; CNRS, UMR 5516, Laboratoire Hubert Curien, F-42000, Saint-Etienne, France.
J Opt Soc Am A Opt Image Sci Vis. 2012 Aug 1;29(8):1537-48. doi: 10.1364/JOSAA.29.001537.
When a transparency printed with a first halftone color is deposited on top of a paper printed with a second halftone color, we obtain a third color that we are able to predict in both reflectance and transmittance modes, thanks to a spectral prediction model. The model accounts for the multiple reflections of light between the printed paper and the printed transparency, which are themselves described by specific reflectance and transmittance models, each one being calibrated using a small number of printed colors. The model can account for light scattering by the inks. The measuring geometry and the orientations of light in the transparency are taken into account on the basis of radiometric rules and geometrical optical laws. Experimental testing carried out from several inkjet-printed CMY halftones shows fairly good agreement between predictions and measurements.
当一张印有一种半色调颜色的透明胶片叠放在一张印有另一种半色调颜色的纸张上时，借助光谱预测模型，我们能够在反射率和透射率模式下预测出第三种颜色。该模型考虑了印纸和印透胶片之间光的多次反射，这些反射本身由特定的反射率和透射率模型描述，每个模型都使用少量印刷颜色进行校准。该模型可以考虑油墨引起的光散射。根据辐射测量规则和几何光学定律，考虑了测量几何形状和透明胶片中光的方向。对几种喷墨打印的CMY半色调进行的实验测试表明，预测结果与测量结果相当吻合。
