an ▁is ▁the ▁complement ▁of ▁red , ▁meaning ▁that ▁the ▁cy an ▁serves ▁as ▁a ▁filter ▁that ▁absor bs ▁red . ▁The ▁amount ▁of ▁cy an ▁applied ▁to ▁a ▁white ▁sheet ▁of ▁paper ▁controls ▁how ▁much ▁of ▁the ▁red ▁in ▁white ▁light ▁will ▁be ▁reflected ▁back ▁from ▁the ▁paper . ▁Ide ally , ▁the ▁cy an ▁is ▁completely ▁transparent ▁to ▁green ▁and ▁blue ▁light ▁and ▁has ▁no ▁effect ▁on ▁those ▁parts ▁of ▁the ▁spectrum . ▁Mag enta ▁is ▁the ▁complement ▁of ▁green , ▁and ▁yellow ▁the ▁complement ▁of ▁blue . ▁Com bin ations ▁of ▁different ▁amounts ▁of ▁the ▁three ▁can ▁produce ▁a ▁wide ▁range ▁of ▁colors ▁with ▁good ▁s atur ation . ▁ ▁In ▁in k jet ▁color ▁printing ▁and ▁typical ▁mass ▁production ▁phot ome chan ical ▁printing ▁processes , ▁a ▁black ▁in k ▁K ▁( Key ) ▁component ▁is ▁included , ▁resulting ▁in ▁the ▁C MY K ▁color ▁model . ▁The ▁black ▁in k ▁serves ▁to ▁cover ▁unw anted ▁t ints ▁in ▁dark ▁areas ▁of ▁the ▁printed ▁image , ▁which ▁result ▁from ▁the ▁imper fect ▁trans par ency ▁of ▁commer cially ▁practical ▁C MY ▁in ks ; ▁to ▁improve ▁image ▁sharp ness , ▁which ▁tends ▁to ▁be ▁de grad ed ▁by ▁imper fect ▁registration ▁of ▁the ▁three ▁color ▁elements ; ▁and ▁to ▁reduce ▁or ▁eliminate ▁consumption ▁of ▁the ▁more ▁expensive ▁color ▁in ks ▁where ▁only ▁black ▁or ▁gray ▁is ▁required . ▁ ▁P ure ly ▁phot ographic ▁color ▁processes ▁almost ▁never ▁include ▁a ▁K ▁component , ▁because ▁in ▁all ▁common ▁processes ▁the