Patent ID: 7068958

Claim:
An image forming apparatus comprising: at least one color cartridge that supplies at least one color toner; a monochrome cartridge that supplies monochrome toner; an image formation unit configured to form an image on an image-transferring member using at least one of the at least one color toner and the monochrome toner; and a processor electrically coupled to the image formation unit, the processor configured to: determine whether the at least one color cartridge contains insufficient color toner for printing an image according to a first image job; and control the image formation unit to print a second image job before the first image job requiring the at least one color cartridge if the at least one color cartridge contains insufficient color toner for printing the image of the first image job, wherein the second image job is a monochrome image job and the first image job is a color image job; wherein, when the processor determines that the at least one color cartridge contains insufficient color toner for printing an image according to the first image job, the processor controls, without any user input, the image formation unit to print the second image job and a third image job that is a monochrome image job before the first image job.