An image processing method for processing a display image includes using an image forming apparatus which includes a position detector detecting a position of contact with a display screen and forms an image on a recording medium based on a display image displayed on the display screen. The display image includes an object image indicative of an object for an image formation and a medium image indicative of the recording medium, and the image processing method includes modifying magnification of the object image with respect to the medium image, without modifying the medium image, based on contact positions of two points detected by the position detector.