The Relationship between the Densities and Dot Sizes of Multi-colour Halftone Images

Abstract

AbstractThe relationship between ink density, dot size and integrated density of monochrome halftone areas is briefly reviewed and their colour is compared with that of continuous tone areas From the monochrome relationship and from those established by Neugebauer an expression for the densities to red, green and blue light of multi-colour halftone areas is derived, and the principles oftheadditivity of halftone densities, and of the equivalence of continuous tone and halftone densities are deduced. On the basis of the former principle it is shown that with equal dot sizes of the image components a neutral scale can only be obtained if restrictions are placed on the concentration and colour of the inks. Finally, examples of the failure in practice of the additivity principle are discussed.