In applications that require spectral color information, such as fine art printing field, industry has been able to improve reproduction quality substantially in the past decade by increasing the printer gamut space and improving other print quality attributes such as metamerism. As the number of inks used in the printer is increasing and researchers are able to understand the ink and media interaction more in detail, attempting to match a color in spectral space has been possible. Similar trend is happening for electronic displays such that now there are cameras and displays with 4 or 6 color channels or filters available.This paper focuses on the following two fundamental question in spectral color reproduction:1. What is the optimal number of inks, and which types of inks to use?2. How to create the ink combination that replicates a given spectral reflectance as closely as possible?
Behnam Bastani, "Spectral Gamut Characteristics based on Number of Primaries and their Characteristics" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP25), 2009, pp 373 - 377, https://doi.org/10.2352/ISSN.2169-4451.2009.25.1.art00103_1