{HEAD ~ An object} of the present invention is to provide {TAIL ~ an image forming apparatus} that can perform a process of transforming an edge of an image such as trapping with less memory than prior art by using a small reference area and modification information 
{ HEAD ~ An object } of the present invention is to provide { TAIL ~ an image forming apparatus } that can perform a process of transforming an edge of an image such as trapping with less memory than prior art by using a small reference area and modification information
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