IMAGE FORMING APPARATUS AND METHOD FOR DISCRIMINATING WHETHER A DOCUMENT IS IN FULL COLOR OR MONOCHROMATIC COLOR

An image forming apparatus for judging, on the basis of image information, whether an image to be printed is a monochromatic image or a full color image, deciding, at the beginning of a job, a separation mode for the monochromatic image and a contact mode for the full color image, deciding, after a predetermined condition is satisfied on the basis of previous result information of the concerned job, the contact mode for both monochromatic images and full color images, and printing the images in the decided mode.