1. An ink-jet printing apparatus for printing a visible image on a print medium by discharging ink from a plurality of ink ejection print elements, comprising: means for storing a first table indicating a correspondence between a plurality of inks and gray scale values of print pixels; means for storing a second table indicating combinations of density distribution patterns of print pixels and the ink ejection print elements in correspondence with the gray scale values; designation means for designating a region consisting of a predetermined number of neighboring pixels from pixels that forms an input image; selection means for selecting the pixel density distribution pattern for the designated region; and control means for controlling ink ejection/non-ejection of ink from the plurality of ink ejection print elements by looking up the first and second tables in accordance with the pixel density distribution pattern and a gray scale value thereof.