Modern printers allow printing on different paper types with many different coloured inks. Therefore, predicting the reflectances of paper printed with solid inks and ink superpositions (Neugebauer primaries) is of high importance. Given the separately measured transmittance of an ink and the reflectance of a white diffusing background, we try to predict the reflectance of the inked white diffusing background by relying on a modified Saunderson formula accounting for the differences in the measurement geometries when performing transmittance and reflectance measurements. Accurate reflectance predictions are obtained for the cyan and magenta ink patches as well as for their ink superpositions. Less accurate predictions are obtained for the yellow ink patches or for ink superpositions incorporating the yellow ink. We suspect that the yellow ink layer is at the origin of optical phenomena which behave differently in reflectance and transmittance modes, and therefore allow less accurate predictions.
Razieh Jafari, Roger D. Hersch, "Predicting reflectances of Neugebauer primaries by relying on separately measured ink transmittances" in Proc. IS&T CGIV 2012 6th European Conf. on Colour in Graphics, Imaging, and Vision, 2012, pp 75 - 80, https://doi.org/10.2352/CGIV.2012.6.1.art00014