Patent ID: 8336982
Filing Date: 2012-12-25
Classification: B41J

Abstract:
1. A method of printing a document using a fluid-ejection printing device, the method comprising: receiving gray scale image data for the document; identifying at least one area fill feature of the image data; determining whether the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect if printed in an N-pass bidirectional print mode, where N is an integer; printing non-fill regions of the image data using the N-pass bidirectional print mode; and automatically switching to an M-pass bidirectional print mode for printing the at least one area fill feature when it is determined that the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect, where M is an integer greater than N.