Patent ID: 7936480

Claim:
A method of printing with a printer having a printer controller configured to perform page expansion and printing of image data received from a computer, the method comprising the steps of: receiving the image data from the computer, the data having a bi-level black layer compressed in an EDRL (Edge Delta and Runlength) format and a continuous tone (“contone”) layer, decompressing the respective layers in parallel; halftoning contone layer data to a bi-level data and compositing the bi-level black layer over the bi-level data to form an image; and transmitting the image to the printhead having staggered nozzles designed to match a flow of paper through the printer; and operating the printhead according to one of a low-speed nozzle firing mode and a high-speed firing mode to print the image on the paper, the low-speed firing mode having a firing rate half that of the high-speed firing mode.