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US07936478B2 Method of printing a compressed image having a bi-level black layer and a contone layer 失效
打印具有双层黑色层和连续色调层的压缩图像的方法

Method of printing a compressed image having a bi-level black layer and a contone layer
Abstract:
Provided is a method of printing a compressed image. The method includes the steps of receiving, with a printer controller, the image, having a bi-level black data layer compressed in an Edge Delta and Runlength (EDRL) compression format and a continuous tone (contone) CMYK data layer, from a computer. The method includes the steps of expanding the image by simultaneously decompressing the two data layers in parallel, and halftoning the contone CMYK data layer into bi-level CMYK data layer. Also included are the steps of compositing the bi-level black data layer over the bi-level CMYK data layer to form a composited bi-level CMYK image, transmitting the composited bi-level CMYK image to a memory buffer of pagewidth printer for printing.
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