Patent ID: 6373594
Filing Date: 2002-04-16
Classification: H04N

Abstract:
A method of halftoning a color image having a matrix of image data elements comprising the steps:providing a first halftone screen having a first screen matrix of threshold values, the first screen matrix having screen locations corresponding to the matrix of image data elements, each screen location having a threshold value selected from a range of threshold values; generating a second halftone screen having a second screen matrix of threshold values each inversely related to the corresponding threshold value of the first screen; and generating a third halftone screen having a third screen matrix of threshold values each functionally related to the corresponding threshold value of the first screen, with the lowest values of the third screen being assigned to locations corresponding to locations of the first screen having intermediate threshold values, and the highest values of the third screen being assigned to locations corresponding to locations of the first screen having lowest and highest threshold values.