August 1, 2006

A method of, and apparatus for, dithering an image to be printed. Color component values of odd and even pixels of an image are stored in a dither cell. The dither cell is mapped to a staggered dither cell such that lines of odd pixel component values are staggered relative to lines of even pixel component values. Addressing of the staggered dither cell is determined by an address generator that also addresses a buffer storing an up-interpolated image. Corresponding values in the staggered dither cell and the buffer are compared to determine which nozzles of a printhead are fired.

4

August 1, 2006

10/636,200

August 8, 2003

358/1.9   358/1.18 358/501

G06F   15/00   (20060101)  

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Divisional Application of U.S. Ser. No. 09/575,120, filed on May 23, 2000 now abondoned.

May 25, 1999 [AU] PQ0560

358/1.9   358/1.18  

7259889 - Method and apparatus for dithering - Owned by Silverbrook Research Pty Ltd (Balmain, New South Wales,AU) A method of, and apparatus for, dithering an image to be printed. Color component values of odd and even pixels of an image are stored in a dither cell. The dither cell is mapped to a staggered dither cell such that lines of odd pixel component values are staggered relative to lines of even pixel component values. Addressing of the staggered dither cell is determined by an address generator that also addresses a buffer storing an up-interpolated image. Corresponding values in the staggered dither cell and the buffer are compared to determine which nozzles of a printhead are fired.