1. A printing method, comprising the step of: printing an image of a plurality of pixels by discharging a plurality of size-varying ink droplets each representing a tone of the corresponding pixe; and correcting any of the tones in accordance with a tone curve that serves as a criterion for a tone correction and defines a tone relationship in terms of before and after the tone correction; wherein in the printing step, the image is printed with the tone corrected in the correcting step using any of the droplets of a size corresponding to the corrected tone.