The process for forming an image having a desired function preflight color appearance is improved, and the resultant data to a printer via a printer interface is improved.
CPU performs color space compression of the input image, and performs masking processing associated with image formation. After a plurality of images of different color space compression processing to a monitor via a video interface. The monitor displays a plurality of images on one screen. The user selects a plurality of images from the display of the monitor image having a desired color appearance. The CPU converts the color reproduction range of the input image is a color reproduction range of the selected image, and the resultant data to a printer via a printer interface. Because the process for forming an image having a desired function preflight color appearance is improved.