Patent ID: 6665094
Filing Date: 2003-12-16
Classification: B41J,G03G,G06F,G06K,H04N

Abstract:
A printer driver for a printer; said printer driver managing a two layer buffer which represents a page to be printed; the first layer of said buffer containing background contone data; the second layer of said buffer containing foreground bi-level data; said printer driver transmitting data from said buffer to said printer; said printer compositing data from said layers of said buffer; said printer driver operating such that when it determines that contone data being composited with said contone layer obscures data in said bi-level layer, said obscured bi-level data is removed from said bi-level layer and is either discarded, or in the case where there is some interaction between the image represented by said obscuring contone data and the image represented by said obscured bi-level data then said obscured bi-level data is composited with said contone layer before said obscuring contone data is composited with said contone layer.