Bidirectional multi-pass inkjet printer suppressing density unevenness based on image information and scan line position of each dot

An image forming apparatus for forming an image by causing a printhead having a plurality of ink discharge portions to execute relative forward and backward scanning movements to the same area on a print medium a plurality of times based upon entered image information, said apparatus comprising:

• a color converting unit configured to subject the entered image information to a color conversion in accordance with ink color and generate a print image;
• a print data generating unit configured to generate print data of each scan corresponding to multiple scans of the print image generated by said color converting unit;
• and
• a control unit configured to control at least one of said color converting unit and said print data generating unit based upon a position on a scanning line of each dot to be printed;
• wherein said control unit controls at least one of said color converting unit and said print data generating unit based upon scanning direction of the forward and backward relative scanning movement.