1. An image forming apparatus for forming an image on a recording medium using a second color separation table which is generated by a color processing apparatus comprising: an obtainer, configured to obtain measurement values regarding a gloss characteristic of a plurality of clear patches formed with a plurality of different amounts of the clear ink overlapping a plurality of color patches formed with color separated values from a first color separation table for the color inks; a selector, configured to select one measurement value from the measurement values of the plurality of clear patches for each color or gray level indicated by patch data of the plurality of color patches based on the obtained gloss characteristic; and a generator, configured to generate, based on the selected measurement value and the first color separation table for the color inks, the second color separation table to be used in a case where the color inks and the clear ink are used, wherein the gloss characteristic includes specular glossiness, image clarity, and specular color, and wherein the generator generates the second color separation table based on priority for each of the specular glossiness, image clarity, and specular color for each color reproductive region and each lightness region.