Is it me, or is the Point command up the creek again?
Take a look at this example.
sync on : sync rate 60
ink rgb(255,0,0),0 : text 1,1,"Testing Red"
ink rgb(0,255,0),0 : text 1,17,"Testing Green"
ink rgb(0,0,255),0 : text 1,33,"Testing Blue"
ink rgb(255,255,255),0 : text 1,49,"Testing White"
for y = 1 to 70
for x = 1 to 110
rem --- read color from top left corner of screen
col = point(x,y)
rem --- copy the color below
dot x,y + 100, col
next x
next y
sync
wait key : end
It looks like its only reading the blue componant.