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