Adding a background matte
You can create a full-frame matte of a solid color that you can use like a clip. You can use mattes, for example, as a solid background for titles. Brightly colored mattes can serve as temporary backgrounds while you use a key to help you see transparency more clearly.
To create a background matte: - Activate the Project window.
- Choose File > New > Color Matte.
- Select a color from the Color Picker window and click OK.
- Type a name for the matte, as you want it to appear in the Project window. Then click OK.
Create a backdrop from an existing frame by exporting a frame as a still image. See Exporting a still image.
To use a temporary matte for keying: - Create a background matte as described above. Typically, a bright green or yellow works best.
- Place the matte in a track beneath the clip you are keying, in either a superimpose track or the Video 1 track.
- Make the matte the same length as the clip you are keying so that you can preview transparency across the entire clip.
- Create transparency in the clip as described in Using keys to superimpose and create composites. The brightly colored matte shows through in the areas that are transparent.
- When you are satisfied with your keying, delete the colored matte from the Timeline window.
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