1. An image processing device that transmits print image data to an image forming portion to form a target image on at least one recording medium, comprising: a processor; and a non-transitory, computer-readable medium storing computer-readable instructions that, when executed by the processor, cause the image processing device to perform steps, comprising: receiving image data for forming the target image on the at least one recording medium; generating display image data from the image data at a display scale for displaying the target image including an element of the target image on a display portion prior to formation of the target image on the at least one recording medium; generating print image data from the image data at a print scale for forming the target image on the at least one recording medium, such that the element of the target image to be formed on the at least one recording medium has substantially the same size as the element of the target image displayed on the display portion; transmitting the display image data to the display portion; specifying a size of the at least one recording medium on which the target image is to be formed by the image forming portion; determining whether the target image to be printed on the at least one recording medium is compatible with the specified size of the at least one recording medium; and issuing a notification when the target image to be printed on the at least one recording medium is greater in size than the specified size of the at least one recording medium.