1. An ink-jet recording device for printing images based on image data using a recording head, said ink-jet recording device comprising: a determining unit configured to determine object attributes of said image data; a storing unit configured to store a plurality of conversion tables for conversion from a RGB color expression to a YMCK color expression; a color conversion unit configured to convert color using a predetermined conversion table of said plurality of conversion tables, according to the object attributes determined by said determining unit; a generating unit configured to generate non-proximity pixel data using proximity pixel data and original data; and a reduction unit configured to reduce black image data of a non-edge portion of an area formed by using black ink, wherein the non-edge portion is specified by the non-proximity pixel data, wherein said color conversion unit is configured to differentiate between a conversion table for use in color conversion of a picture image, and a conversion table for use in color conversion of a character image, wherein in the case of said image data object attribute being a picture image, said color conversion unit is configured to use a conversion table wherein the black region of the picture image converted to YMCK color expression is smaller than the black region of the picture image of RGB color expression before conversion, and wherein said reduction unit performs the same reduction process, regardless of the object attributes.