Next, a black reference strip is scanned and, an offset value is determined and {TAIL ~ an offset voltage} is added to {HEAD ~ the D.C. restoration level} 
Next , a black reference strip is scanned and , an offset value is determined and { TAIL ~ an offset voltage } is added to { HEAD ~ the D.C. restoration level }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD