Applying the Yule-Nielsen equation with negative n

Achim Lewandowski, Marcus Ludl, Gerald Byrne, Georg Dorffner
2006 Optical Society of America. Journal A: Optics, Image Science, and Vision  
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 50 years now, but apparently the tuning parameter n has only been taken to be larger or equal than 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 TM and Kerajet TM printing techniques)
more » ... found that using a negative n in almost all considered cases resulted in a better fit.
doi:10.1364/josaa.23.001827 pmid:16835638 fatcat:exd7vgky7fac7oxsmgslthfmye