Let D represent {HEAD ~ the input density} to {TAIL ~ the characteristic curve LUT}, and E represent the characteristic curve output 
to
Let D represent { HEAD ~ the input density } to { TAIL ~ the characteristic curve LUT } , and E represent the characteristic curve output
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH