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)

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... found that using a negative n in almost all considered cases resulted in a better fit.