There is disclosed an image display displaying a multicolor image by using image data expressing color components of a first color specification system. The image display is provided with a display unit displaying an image by a second color specification system which is different from the first color specification system, and displaying each of colors included in the second color specification system per pixel in correspondence to input device data, a basic color computing unit (46) determining basic data expressing each of the color components in the second color specification system by using the input image data of the first color specification system, a specific color computing unit (48) determining specific data expressing each of color components in a third color specification system by using the input image data of the first color specification system, a combining unit (54, 56, 58) combining each of reference data of the base color computing unit and each of specific data of the specific color computing unit so as to determine combined data of each of the colors, and an output data computing unit (60) determining device data of each of the colors of the display unit on the basis of the combined data.