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