Patent ID: 6062137
Filing Date: 2000-05-16
Classification: H04N

Abstract:
A method for use in printing; said method comprising the steps of:printing a primary color test tile using at least one print cartridge installed in a printer;measuring the primary color test tile printed by the installed at least one print cartridge by using an optical sensor located on the printer to obtain a primary color test tile measured value;first calculating a scaling factor by dividing the primary color test tile measured value by a measured value of a standard primary color test tile previously printed by a standard print cartridge and measured by the optical sensor, the measured value of a standard primary color test tile having been stored in the printer;second applying the calculated scaling factor in calculating spectral data and colors for primary ink combinations by applying spectral modeling; andusing the calculated spectral data and colors of the primary ink combinations to perform halftoning in device-independent color space; and wherein:the printing step comprises applying primary color onto a printing medium;the measuring step comprises measuring the applied primary color as it appears on said printing medium, and also measuring appearance of said printing medium alone; andthe applying step comprises the substeps of:isolating color effects of the applied primary color alone from the measured applied primary color as it appears on said printing medium,predicting color effects due to the applied primary color alone when mixed with color effects of other applied primary colors alone, andmodifying the predicted color effects of mixed applied primary colors alone by reintroducing influence of a printing medium on said predicted color effects.