Patent ID: 8760740

Claim:
An image forming apparatus comprising: a rasterization unit configured to rasterize job data into bit map data; a color conversion unit configured to perform color conversion processing on the bit map data by using a color conversion table for color when the bit map data rasterized by the rasterization unit is subjected to color conversion in a color mode, and to perform color conversion processing on the bit map data by using a color conversion table for monochrome when the bit map data rasterized by the rasterization unit is subjected to color conversion in a monochrome mode; a pre-color conversion unit configured to perform color conversion processing on the job data by using a pre-color conversion table before the bit map data is subjected to the color conversion processing by the color conversion unit when the job data is rasterized into the bit map data by the rasterization unit; and a performing unit configured to, when color data and monochrome data are mixed in a piece of the job data to be rasterized by the rasterization unit, perform color conversion using the pre-color conversion table on the color and monochrome mixed job data by the pre-color conversion unit so that the color conversion unit performs color conversion processing on color and monochrome mixed bit map data by using the color conversion table for color.