PDF (adobe.com)

Create a solid color matte

You can create a full‑frame matte of a solid color to use as a clip. Solid background mattes can be used for titles.

  1. Select the Project panel.
  2. Choose File > New > Color Matte.
  3. Select a color from the Adobe Color Picker and click OK.
  4. In the Choose Name dialog box, type a name for the new matte and click OK.

    The matte appears as a still image in the Project panel.

    Brightly colored mattes can serve as temporary backgrounds to help you see transparency more clearly while you adjust a key effect.