A characteristic curve interface is provided allowing {HEAD ~ an operator} to place {TAIL ~ the subject image} on the characteristic curve so that the image processing system tracks the location of the subject image on the curve 
to place
A characteristic curve interface is provided allowing { HEAD ~ an operator } to place { TAIL ~ the subject image } on the characteristic curve so that the image processing system tracks the location of the subject image on the curve
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH