1. An image processing device comprising: an image processing unit that produces a plurality of sample images of a certain image in correspondence to values for at least one parameter for processing the certain image; a sheet forming unit that forms a setting sheet used for setting the at least one parameter, the setting sheet including the sample images arranged in a predetermined order, the number of the sample images being smaller than the number of the values for the at least one parameter; and a printing unit that prints the setting sheet formed by the sheet forming unit.