Another great strength of Premiere is its ability to layer (or composite) multiple clips over one another. It can be as simple as placing a logo over a product shot or shooting actors in front of a green screen and then electronically placing them within a scene.
There are four basic composite methods:
Reducing the opacity of an entire clip so a clip (or clips) below it on the timeline show through.
Using "keys" to make portions of a clip transparent so clips below it on the timeline show through.
Blocking or matting parts of one clip to let parts of other clips show through.
Using a clip's alpha channel to create a transparency.
This hour will cover the first two topics, and I'll save the latter two for Hour 15, "Compositing Part 2: Alpha Channels and Mattes."
The highlights of this hour include the following:
Compositing?what it is and how it can spice up your video projects
Shooting video that you can use for compositing
Changing a clip's opacity to let other clips show through
Making colors transparent?using chroma-keying, blue/green screens, and the RGB Difference key
Using Luminance-style keys to create transparencies