Resolution and tonal continuity in bilevel printed picture quality

Abstract

Bilevel printing of continuous tone pictures has the potential to be effectively perfect when the contrast information in a picture matches or exceeds the capacity of the eye to make use of it. Useful pictures may be printed with much lower information content provided that the reduction is compatible with the characteristics of the visual system. A review of these requirements provides a framework for the examination of published bilevel printing schemes. From this conclusions are drawn concerning the best scheme to use under various printing constraints.