Patent ID: 7173719

Claim:
A printer controller comprising: at least one input port for receiving print data in a page descriptive language format; a digital signal processor connected to said at least one input port; a print engine controller bidirectionally coupled to said digital signal processor, said print engine controller supplying print control signals to a print engine under control of said digital signal processor and receiving printer sensor signals from the print engine for supply to said digital signal processor; said printer sensor signals includes at least one optical density sensor of a printed page; and wherein said digital signal processor is programmed to: convert said print data from said page descriptive language format into print data for supply to the print engine via said print controller, said conversion including screening, provide real time feedback control of a print process of the print engine via control of said print control signals in response to said printer sensor signals, and respond to said at least one optical density sensor to adjust screening in said conversion of said print data from said page descriptive language format into print data for supply to the print engine to maintain uniform optical density in the printed page.