1. A method of setting a tone in order to print a monochrome image, comprising the steps of: (a) providing a plurality of candidate one-dimensional lookup tables each having different color reproduction characteristics, each one-dimensional lookup table being configured to output ejection amounts of a plurality of types of ink in response to input of lightness level values of an image; (b) generating a plurality of monochrome sample images from a given gray multilevel image data using the plurality of candidate one-dimensional lookup tables, and reproducing a catalog image wherein the plurality of monochrome sample images are arranged; and (c) obtaining a printing-use one-dimensional lookup table for use in printing the monochrome image, based on at least one monochrome sample image selected from the a catalog image and the candidate one-dimensional lookup table associated with the selected monochrome sample image.