Patent ID: 7513589
Filing Date: 2009-04-07
Classification: H04N

Abstract:
1. A multi-pass printing system for printing an image, comprising a plurality of continuous-tone values, based on halftone matrices having threshold values, the printed image being composed of sub-images, each of which comprising dots printed in a respective pass, the sub-images presenting independent dot patterns at corresponding places, the printing system being arranged to obtain the sub-images by splitting the continuous-tone values into at least two pass values, an individual pass value indicating an intensity to be printed in a respective pass, using in one pass a first halftone matrix for printing the respective pass values, and using in another pass one or more second halftone matrices, obtained by positionally shifting the threshold values of the first halftone matrix, for printing all pass values of the other pass, or at least those pass values above a highlight threshold.