Patent ID: 8789907
Filing Date: 2014-07-29
Classification: B41J

Abstract:
1. A method of processing printhead control data in a printer comprising an inkjet printhead, the printhead comprising N nozzles through which printing fluid is ejectable during a pass of the printhead across a print zone, the method comprising: obtaining printhead control data describing pixel locations to be printed on a media, the printhead control data derived from an image to be printed; allocating, for a swath of the image, each of those pixel locations to be printed to a printhead nozzle and to a print pass of a set of P print passes in accordance with a print mask, wherein the print mask defines: a first section associated with a first group of nozzles at the leading edge of the printhead having a first average print density; a fifth section associated with a fifth group of nozzles at the trailing edge of the printhead having a fifth average print density; a second section associated with a second group of nozzles immediately adjacent the first group of nozzles and having a second average print density; a fourth section associated with a fourth group of nozzles immediately adjacent the fifth group of nozzles and having a fourth average print density; a third section associated with a third group of nozzles intermediate the second and fourth groups of nozzles and having a third average print density.