blending images?

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blade007

is it possable to blend an image into another one?
like u gather and save a screen hot of game then average it in with another
would look kinda like this?

graphics 800,600,32,1
setbuffer backbuffer()
car=loadimage("car.bmp")
dude_thats_behind_window_in_car=loadimage("dude.bmp")
while not keydown(1)
    drawimage dude_thats_behind_window_in_car,x,y
        blendimagestobackground(car)
  flip
  cls
wend

function blendimagestobackground(car)
  ;stuff goes in here
end function

any ideas how to do this?