Process by which continuous tone is simulated by a pattern of dots of varying size.

This is a colour system that uses a set of six inks, made up of a modified four-colour set plus orange and green. The objective of hexachrome is to improve the printed colour gamut. Using hexachrome allows about ninety per cent of Pantone's special colours.

A spot on a printed sheet caused by dust, lint or ink imperfections. It is particularly noticeable on solids or halftones.