Patent ID: 8885185

Claim:
An image forming system comprising: a controller, provided with a list creation means to create a display list by analyzing PDL data, a decompression means to decompress compressed image data, a first drawing means to execute drawing processing based on the image data, and a print data creation means to create the print data based on the image data, for sending the print data to a printer; and a rasterization accelerator, provided with a second drawing means to execute drawing processing based on the display list, and a first compression means to compress the image data drawn by the second drawing means, for sending the image data to the controller, wherein the rasterization accelerator comprises a determination means for determining, based on information of the display list created by the list creation means, whether to execute or not the compression of the image data by the first compression means, and a compression method in case of executing the compression by the first compression means, wherein compression processing of the image data by the first compression means includes lossless compression processing, lossy compression processing, and binarization processing, wherein the information of the display list comprises information of whether to execute or not the drawing processing by the first drawing means after executing the drawing processing by the second drawing means, and wherein, in case of receiving the information from the display list that the drawing processing is not to be executed by the first drawing means, the determination means determines to use the lossy compression processing in the image data compression by the first compression means.