Filter Designs for Multiresolution Halftoning

Abstract

Halftoning is used to create the illusion of new colors when only a limited number of colors is available for rendering. Many techniques for color halftoning are based on techniques taken from monochrome halftoning, but modified so that the algorithm is applied to each color component separately. These techniques work well if the palette is separable, but for the case of arbitrary palettes, only error diffusion has been widely used or studied, especially in the context of rendering true-color images on color indexed display systems. We present an alternative algorithm for color halftoning whether the color palette is arbitrary or image dependent. A systematic way of developing suitable filters for this multiresolution halftoning technique is described.