▁it ▁has ▁been ▁advert ised ▁as ▁a ▁ 1 0 . 2 ▁MP ▁camera ▁by ▁taking ▁into ▁account ▁that ▁each ▁photos ite ▁contains ▁stack ed ▁red , ▁green , ▁and ▁blue ▁color - sens ing ▁phot odi odes , ▁or ▁pixel ▁sens ors ▁( 2 2 6 8 ▁× ▁ 1 5 1 2 ▁× ▁ 3 ). ▁By ▁comparison , ▁the ▁dimensions ▁of ▁the ▁photos ite ▁array ▁in ▁the ▁ 1 0 . 2 ▁MP ▁Bayer ▁sensor ▁in ▁the ▁N ikon ▁D 2 0 0 ▁camera ▁are ▁ 3 8 7 2 ▁× ▁ 2 5 9 2 , ▁but ▁there ▁is ▁only ▁one ▁phot odi ode , ▁or ▁one - p ixel ▁sensor , ▁at ▁each ▁site . ▁The ▁cam eras ▁have ▁equal ▁numbers ▁of ▁phot odi odes ▁and ▁produce ▁similar ▁raw ▁data ▁file ▁sizes , ▁but ▁the ▁Bayer ▁filter ▁camera ▁produces ▁a ▁larger ▁native ▁file ▁size ▁via ▁dem osa icing . ▁ ▁However , ▁the ▁actual ▁resolution ▁produced ▁by ▁the ▁Bayer ▁sensor ▁is ▁more ▁complicated ▁than ▁the ▁count ▁of ▁its ▁photos ites , ▁or ▁its ▁native ▁file ▁size ▁might ▁suggest . ▁The ▁reason ▁has ▁to ▁do ▁with ▁both ▁the ▁dem osa icing ▁and ▁the ▁separate ▁anti - ali asing ▁filter ▁commonly ▁used ▁to ▁reduce ▁the ▁occurrence ▁or ▁sever ity ▁of ▁color ▁mo ir é ▁patterns ▁that ▁the ▁m osa ic ▁characteristic ▁of ▁the ▁Bayer ▁sensor ▁produces . ▁The ▁effect ▁of ▁this ▁filter ▁is ▁to ▁bl ur ▁the ▁image ▁output ▁of ▁the ▁sensor , ▁thus ▁producing ▁a ▁lower ▁resolution ▁than ▁the