Patent ID: 7438374

Claim:
A printing apparatus which prints a dot image on a printing medium by scanning a printhead configured to print a first dot and a second dot smaller than the first dot, the apparatus comprising: an obtaining unit configured to obtain, for each of areas formed by dividing an area on the printing medium into a plurality of portions, tone value information of first dot multilevel image data corresponding to a plurality of pixels constituting the area and tone value information of second dot multilevel image data corresponding to the plurality of pixels constituting the area; and a correcting unit configured to correct the first dot multilevel image data on the basis of the obtained tone value information of the first dot multilevel image data and to correct the second dot multilevel image data on the basis of the obtained tone value information of the second dot multilevel image data, wherein the correcting unit exclusively determines correction target pixel positions of the first dot multilevel image data and correction target pixel positions of the second dot multilevel image data.