Fade in- out in only one frame.for cut scenes

Hi

i make a platformer engine with multiscenes (Not scrolling) in one big resolution frame .like:

set scrollX to Player .x /160*160+80

Its work fine.but:

I have a little question:how do i make fade in-out between cut scenes in same frame?
I tried a object for collision in end edges coordinate for fade in-out.but its doesnt work perfect.is any suggestion?