Writepixel command

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jfk EO-11110

Maybe the "index" dimanesion isn't required. Probably he meant something like this:

sw=graphicswidth()
sh=graphicsheight()
setbuffer backbuffer()

dim arr(sw-1,sh-1)
lockbuffer()
for j=0 to sh-1
for i=0 to sw-1
argb=readpixelfast(i,j)  ;read pixel
arr(i,j)=argb    ; store in array
argb2= (argb and FEFEFE) shr 1  ;  some fx: darken
writepixelfast i,j,argb2
; or, of course:
writepixelfast i,j,arr(i,j)  ; accessing array by pixel coords
next
next
unlockbuffer()

(just typed)