An inkjet image forming apparatus and a method of performing a high resolution printing using multiple passes. In the inkjet image forming apparatus and a method of performing a high resolution printing, it is possible to obtain a resolution that is higher than an actual resolution of a print head by performing a printing operation several times on a printing medium in a multi-pass type printing method while moving the print head along a length direction thereof. As a result, printing quality can be improved by minimizing visibility of missing dots that occur due to failed nozzles.
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