is there a way to adjust the size of a green screen image? What I would like to do is have the same ability as with doing a picture in picture, where you can adjust the size of the picture within the picture, only with a green screen image. For example, you have a green screen video clip of a butterfly that you want to place in a clip of your backyard. When you do this, the butterfly looks like a 747. Can the butterfly clip be made smaller. I am only using iMovie but have not seen this feature mentioned in descriptions of FCP of AE, etc.