title: Applying the Yule-Nielsen equation with negative n.
abstract: The theory of halftone printing has attracted the attention of both industry and scientists for decades. The Yule-Nielsen equation has been used for color prediction for more than fifty years now, but apparently the tuning parameter n has been taken to be only larger than or equal to one. Our paper shows that the extension to the whole real axis is well defined in a mathematical sense. We fitted models to data from the ceramics tile printing sector (Rotocolor and Kerajet printing techniques) and found that using a negative n in almost all considered cases resulted in a better fit.
authors.affiliation: Austrian Research Institute for Artificial Inteligence, Vienna, Austria. achim.lewandowski@meuniwien.ac.at
authors.forename: Achim
authors.initials: A
authors.lastname: Lewandowski
authors.forename: Marcus
authors.initials: M
authors.lastname: Ludl
authors.forename: Gerald
authors.initials: G
authors.lastname: Byrne
authors.forename: Georg
authors.initials: G
authors.lastname: Dorffner