Adequate correction processing is performed on image data based on the degree of ink concentration that occurs even. An image processing apparatus having: acquisition unit for acquiring multi-value image data and a first parameter related to the degree of concentration of ink; first generation unit for generating corrected data by correcting the multi-value data that is to be printed for the first pixel based on the multi-value data that is to printed in the first pixel and a first parameter; and second generation unit for generating the first parameter and a second parameter that indicates the degree of ink concentration of the plurality of nozzles when printing a second pixel that is printed by the nozzles next to the first pixel.