An image forming apparatus having a printing section loaded with a first toner group, and a second toner group having a higher chroma value than the first toner group; and a control section which is configured to: convert color information of each part of an image based on image data specified by a print job into values in a prescribed color space; make a first judgment of a toner group proper to the image by comparing the values in the prescribed color space with color reproducible range of previously registered each toner group; make a second judgment of the toner group proper to a recording sheet and/or a printing condition which being specified by the print job, by referring to previously stored correlation information; and determine the toner group to be used for printing the image, based on results of the first and second judgments.