Patent ID: 7095530
Filing Date: 2006-08-22
Classification: G06K,H04N

Abstract:
1. A method of rendering a color image with a plurality of separations on an output device, with a halftone process using a single screen for said plurality of separations, wherein the screen is comprised of a plurality of pixel locations with associated threshold values and the image is comprised of a plurality of separation values, the method comprising steps of: rendering a first one of the plurality of separations in accordance with the screen, wherein the plurality of pixel locations are turned on or off at a given pixel location based on a comparison of the image separation value at that pixel with the screen threshold value, rendering a next one of the color separations in accordance with the rendering of the first separation and the screen, wherein for constant image separation values, pixel locations are turned on for the separation at pixel locations disposed in a highest available luminance region having a lowest available threshold value; and when the rendering of the first and next ones of the color separations comes within a preselected number of threshold values of filling the pixels of a luminance region, continuing rendering includes overlapping the luminance region with a next luminance region whereby color inaccuracy due to separation misalignment is diminished for improved color registration latitude.