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