The image forming apparatus 2, wherein the modification information referring modification unit compares the count value with a threshold value and, if the count value is smaller than the threshold value, modifies the pixel of interest based on {HEAD ~ information} in {TAIL ~ the reference area} 
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The image forming apparatus 2 , wherein the modification information referring modification unit compares the count value with a threshold value and , if the count value is smaller than the threshold value , modifies the pixel of interest based on { HEAD ~ information } in { TAIL ~ the reference area }
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