Color Gamut Improvement when Using FM-Screening

Colours printed with non-periodic (FM) screening produce a higher colour gamut as compared to dot centered printing with periodic screening. It was proved by colour measurement that FM-prints, particularly in the midtone range, exhibit a higher lightness at the same chroma. The reason for this effect is now assumed to be a more homogeneous distribution of ink on paper. Still images taken of the nip of an inked running roller system using ultra-high speed flash video recordings led to the conclusion that ink distribution is influenced by splitting in the roller nip and the formation of small accumulations of ink.