Patent ID: 7367644

Claim:
A printing apparatus comprising: a print head in which a plurality of nozzles which can print different sizes of dots are arranged; an image data acquiring unit which acquires image data having M-value density information (M≧3) for every pixel; a density unevenness information acquiring unit which acquires information on density unevenness of the nozzles of the print head; an N-valued data generating unit which performs N-valued processing (M>N≧2) on the image data acquired by the image data acquiring unit to generate N-valued data; a print data generating unit which generates print data from the N-valued data generated by the N-valued data generating unit; and a printing unit which performs printing using the print head based on the print data generated by the print data generating unit, wherein the N-valued data generating unit determines generation ratios of the different sizes of dots for every predetermined region of the image data acquired by the image data acquiring unit based on the density unevenness information acquired by the density unevenness information acquiring unit, and performs N-valued processing (M>N≧2) on the image data based on the determined generation ratios.