Patent ID: 6722751
Filing Date: 2004-04-20
Classification: B41J

Abstract:
A method of correcting for malfunctioning ink ejection elements in a printing system using a single pass over a recording medium, comprising:obtaining a standard printmask; identifying ink ejection elements which are malfunctioning; ascertaining an original color measurement value for each pixel which will be printed with the malfunctioning ink ejection elements; determining a replacement color measurement value closest in value to the original color measurement value which does not use the malfunctioning ink ejection elements for each pixel which will be printed with the malfunctioning ink ejection elements; and modifying the standard printmask by adjusting the number and color of ink drops deposited based on the replacement color measurement value for each pixel which will be printed with the malfunctioning ink ejection elements to create a modified printmask.