| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that the quality of a printed image is deteriorated because dispersibility of dots between passes is not secured in an image forming apparatus that performs multipass printing using a mask pattern. Ž<P>SOLUTION: Print data to be printed in the respective passes are calculated by an error diffusion method. Constraint is specified to the error diffusion method to be performed in the respective passes so as not to perform print for already printed pixels. A print duty is set so that dots printed in the respective passes may be at the same level. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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