I have a moving, animated black and white alpha layer of a small plane (the plane is white, the background is black), and I'd like to replace it with footage (an image) so that the footage is moving like the white plane did.
Create a new comp and drag both the alpha matte and the footage into the comp. Place the alpha layer on the top of the layer stack. Change the footage layer's track matte(if the track mattes pulldown isn't visible, press F4) to alpha matte and it will show in the white area's of the alpha layer.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.