A method for halftoning image information which comprises the step of comparing such information against at least one array, wherein said at least one array is comprised of multibit threshold values, and said at least one array, when thresholded, produces a dot pattern according to a substantially blue noise power spectrum and wherein said step of comparing is used to produce a halftoned image. view more

A method for the halftoning of an image which comprises the step of comparing information derived from said image against at least one array, wherein said at least one array, when thresholded, produces a pattern that exhibits a power spectrum substantially characteristic of a blue noise power spectrum and wherein said step of comparing is used to produce a halftoned image. view more

An apparatus for halftoning image information, comprising a comparator for comparing such information against at least one array, wherein said at least one array is comprised of multibit threshold values, and said at least one array, when thresholded, produces a dot pattern according to a substantially blue noise power spectrum and wherein an output of said comparator is used to produce a halftoned image. view more

An apparatus for halftoning a color image, comprising a comparator for comparing information derived from at least one component color of such image against at least one array, wherein said at least one array, when thresholded, exhibits a power spectrum substantially characteristic of a blue noise power spectrum and wherein an output of said comparator is used to produce a halftoned image. view more

A method for the halftoning of color images which comprises the step of utilizing, in turn, a pixel-by-pixel comparison of each of a plurality of color planes of said color image against a mask in which the mask comprises a non-determinate, non-white noise single valued function which is designed to provide visually pleasing dot profiles when thresholded and wherein said step of utilizing said pixel-by-pixel comparison is used to produce a halftoned image. view more

A method for the halftoning of color images which comprises the step of utilizing, in turn, a pixel-by-pixel comparison of each of a plurality of color planes of said color image against a respective one of a plurality of masks in which each respective mask comprises a non-deterministic, non-white noise single valued function which is designed to provide visually pleasing dot profiles when thresholded and wherein said step of utilizing said pixel-by-pixel comparison is used to produce a halftoned image. view more

A machine comprising a computer readable storage device which stores a dither matrix for use in halftoning image information and a comparator responsive to said computer readable storage device, said dither matrix comprising at least one array, said at least one array, when thresholded at a number of levels produces a number of dot profiles, a plurality of said number of dot profiles each having a power spectrum substantially characteristic of a blue noise power spectrum for the level at which such dot profile is produced. view more

The machine of claim 1, wherein substantially all of said number of dot profiles have a power spectrum substantially characteristic of a blue noise power spectrum for the level at which such dot profile is produced.

The computer readable memory device of claim 57, wherein said halftoning mask is designed to produce substantially all visually pleasing dot profiles when thresholded at a number of levels.

A method for the halftoning of color images, comprising the steps of utilizing, in turn, a pixel-by-pixel comparison of each of a plurality of color planes of said color image against a blue noise mask in which the blue noise mask is comprised of a random non-deterministic, non-white noise single valued function which is designed to provide visually pleasing dot profiles when thresholded at any level of said color images, wherein a plurality of blue noise masks are separately utilized to perform said pixel-by-pixel comparison and in which at least one of said blue noise masks is independent and uncorrelated with the other blue noise masks. view more

A method for the halftoning of gray scale images by utilizing a pixel-by-pixel comparison of the image against a blue noise mask in which the blue noise mask is comprised of a random non-deterministic, non-white noise single valued function which is designed to produce visually pleasing dot profiles when thresholded at any level of said gray scale images. view more

The method of claim 1, wherein said blue noise mask is used to halftone a color image.

The method of claim 10, wherein said optical blue noise mask and said image are separately photographed onto said high contrast film such that a repeated exposure of said film occurs.