If the “white” area isn’t transparent in the image, you can use the ChromaKey tool to change the white to transparent. If it’s an easy shape to follow (i.e. rectangular), you might find it easier to use the Bezier Masking tool in Pan/Crop.
Personally, I’d make sure the background is transparent in the original image. Save it as a PNG or PSD (which preserve transparency), and then load it on the timeline. If the background then isn’t transparent, right-click it, go into properties, and change the alpha channel mode.
Edward Troxel
