 Digital halftoning uses a raster image or bitmap within which each monochrome picture element or pixel may be on or off, ink or no ink.Consequently, to emulate the photographic halftone cell, the digital halftone cell must contain groups of monochrome pixels within the same-sized cell area.The fixed location and size of these monochrome pixels compromises the high-frequency/low-frequency dichotomy of the photographic halftone method.