1. An image test apparatus comprising: a color-image-data acquiring unit that acquires color image data being data of an image to be formed with a color material; a master-image-data generating unit that converts the color image data depending on transparent image data being data of an image to be formed with a transparent color material, thereby generating master image data; and an image testing unit that tests, using the master image data, a test image data which is generated by optically reading a print image from a printed matter on which the print image based on the color image data and the transparent image data has been printed, wherein the master-image-data-generating unit includes a first multivalue-data generating unit that converts the color image data to multivalue color image data, a second multivalue-data generating unit that converts the transparent image data to multivalue transparent color image data, a determining unit that determines whether or not clear color is present in the image based upon the multivalue transparent color image data, and a converting unit that converts the multivalue color image data to generate the master image data according to a determination result of the determining unit.