Abstract: Method and apparatus for performing halftoning of an image, using two 2-dimensional look up tables (LUTS). The first LUT receives coordinates of an image value and outputs a screen reference value which then serves, together with the image value as address for the second LUT. The output of the second LUT is the halftone value.

Abstract: A method and apparatus for generating a screened reproduction of an image in which a representation of an original is provided containing information representing the input density values of the original and a plurality of spatial functions and a function of the input density values of the original are utilized to compose reference screen dots. Printing dots are then composed using the reference screen dots and the input density values of the original.

Abstract: A technique for generating a screened reproduction of an image comprising the steps of providing a representation of an original having input density values representing the grey levels of various locations of the original for a given color separation, defining a desired screen dot arrangement for the image, and writing screen dots in a line by line fashion, wherein each screen dot is made up of a plurality of segments whose length and location determines the dot configuration and whose length and location is determined by a digital operation including interpolation employing screen threshold values at at least two spaced locations and by employing the input density information relating to the original.

Abstract: A method for generating a screened reproduction of an image including the steps of providing a representation of an original having input density values representing the grey levels of various locations of the original for a given color separation, defining a desired irregular screen function for the image and writing screen segments in a line by line fashion, wherein each screen segment is a line whose length and location is determined by employing the input density values of the original and the desired irregular screen function.

Abstract: A technique for generating a screened reproduction of an image comprising the steps of providing a representation of an original having input density values representing the grey levels of various locations of the original for a given color separation, defining a desired screen dot arrangement for the image, writing screen dots in a line by line fashion, wherein each screen dot is made up of a plurality of lines whose length and location determines the dot configuration and whose length and location is determined by an analog operation employing the input density values of the original and the desired screen dot arrangement. Apparatus employing the method is also provided.