Patent ID: 8848251

Claim:
A page-wide-array printer comprising a print unit which comprises an array of print-heads, wherein a printing direction is defined by a relative movement between the print unit and a print medium during a printing process; the page-wide-array printer receives a continuous tone image; the page-wide-array printer divides the continuous tone image into a series of slices along the printing direction, wherein a slice of the series of slices is split along the printing direction into a printing area and at least one predetermined extended area, wherein the extended area is a border region of the slice and overlaps an adjacent slice; the page-wide-array printer generates halftone image data from each of the slices using error diffusion halftoning, wherein the error diffusion halftoning comprises processing, with regard to error diffusion, each slice pixel-by-pixel following a processing pattern mainly oriented along a main processing direction, which is parallel to the printing direction; and the page-wide-array printer prints halftone image data along the printing direction.