US 6,982,799 B2
Creating composite page images from compressed data
Paul Lapstun, Balmain (Australia)
Assigned to Silverbrook Research PTY LTD, Balmain (Australia)
Filed on Apr. 24, 2003, as Appl. No. 10/421,824.
Application 10/421824 is a continuation of application No. 09/505008, filed on Feb. 15, 2000, granted, now 6,559,969.
Claims priority of application No. PP9960 (AU), filed on Apr. 23, 1999.
Prior Publication US 2003/0193676 A1, Oct. 16, 2003
Int. Cl. G06F 13/00 (2006.01); G06F 15/00 (2006.01)
U.S. Cl. 358—1.13 16 Claims
OG exemplary drawing
 
1. A printer for printing of a page, the printer including
at least one inkjet printhead,
a printhead controller;
an interface for receiving data relating to the page to be printed, the data including a page description comprising a bi-level black layer and a contone color layer;
at least one raster image processor adapted to raster the received data and compress the rastered data;
the printhead controller including:
a decoding unit that extracts from the compressed rastered data first data relating to the bi-level black layer and second data relating to the contone color layer;
memory that temporarily stores the first and second data;
a ditherer/compositor unit operable to:
produce a dithered bi-level color layer based on the second data,
produce a bi-level black layer based on the first data and
composite the bi-level black layer on the color layer after dithering thereof to produce a page image;
wherein the printhead controller controls the printhead to print the dithered/composited page image.