2D Compositing on the Timeline

Use the Comp Timeline FX to control the composition of a segment with the input on the track beneath it. By default, the currently selected segment is used as the foreground of the composition, and the layer underneath is used as the background; however these inputs can be swapped. The type of composition is determined by the blending mode and the level of transparency of the foreground input.

By default, the Comp Timeline FX button is unmuted: compositing is active and, by default, the foreground and background mattes are on. When muted, only the RGB clip is displayed.

You can use Comp Timeline FX to control the composition and display of the output matte used in the segment's Timeline FX pipeline. In the editor, you can view the composited matte, and edit how it is blended and premultiplied.

Tip: You can set the default premultiplication setting for the segment, background, and output of timeline Comp effects in the Timeline FX / BFX section of the Preference menu.