Cutting out current sky and adding a diff. one.
I was reading in the Director's book and watched the special features on the "Twilight" movie that just came out on DVD.
There was one particular effect that I wasfascinatedwith. In the Baseball scene near the end, they cut out the clouds that were there and added dark menacing storm clouds with lightning.
On a program like FCP/Avid/Sony, how would something like this be done? On the smaller home scale?