Patent ID: 6934054
Filing Date: 2005-08-23
Classification: B41J,H04N

Abstract:
1. A method of converting a full color image to a two color image for a thermal printer, wherein said two colors are a primary color and a secondary color, comprising: providing a color image on a host computer as display pixels, wherein said color image includes a combination of none, one, two, or all three of a first color, a second color, and a third color; converting each pixel to a corresponding printer command; determining a primary color value and a secondary color value for each of said printer commands based on an intensity of said first color, said second color and said third color present in said pixel; comparing each of said primary and secondary color values for each printer command to a given threshold and designating a color value as ON if it exceeds a given threshold, and designating a color value as OFF if it is below or equal to said given threshold; performing a logical OR operation on said primary and secondary color values to produce a secondary value; loading said secondary value into a secondary print buffer; printing nothing if said secondary value is OFF and printing said secondary color if said secondary value is ON; loading said primary color value into a primary print buffer; and printing said primary color if said primary color value is ON.