In this case, a density of information in a record on the file medium undergone the data compression is different from a density of {HEAD ~ information} in {TAIL ~ the original image} 
in
In this case , a density of information in a record on the file medium undergone the data compression is different from a density of { HEAD ~ information } in { TAIL ~ the original image }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL