An object of the present invention is to reduce {HEAD ~ the brightness} of {TAIL ~ the background} to improve the contrast 
of
An object of the present invention is to reduce { HEAD ~ the brightness } of { TAIL ~ the background } to improve the contrast
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH