Used, together with keyframes, to set the relative amount of the effect to be displayed over time. The additional options included with the Level slider vary, depending on the effect.

Level

Controls the opacity of the foreground image. A Level of 0 is 0ápercent opacity (the foreground is transparent), a Level of 50 is 50 percent opacity, and a Level of 100 is 100 percent opacity (no transparency).

Swap Sources

This option applies to key effects (such as Chroma Key or Luma Key) and the PIP (Picture-in-Picture) effect only.

Click Swap Sources to swap the image source for the foreground and background layers of the effect.

Reverse Animation

This option is available for all effects.

Click the Reverse Animation button to cause the entire effect to be reversed, including the direction of movement as well as the incoming and outgoing sources.

This maintains the shot continuity while reversing the movement. For example, instead of the outgoing shot peeling off from the top left corner, the incoming shot peels on from the bottom right corner. This option effectively creates a mirror image of the sequence of keyframes for the effect as they appear in the Effect Preview monitor's position bar.

Invert Key

This option applies to key effects only (such as Chroma Key or Luma Key). Select Invert Key to reverse the key.

In the case of a Chroma Key effect, inverting the key displays the key color regions while showing the background image source through the foreground image area.

In the case of a Luma Key effect, inverting the key displays the background image source through the darker areas rather than the lighter areas of the foreground image source.

In the case of a Matte Key effect, inverting the key effectively reverses the black and white areas of the alpha channel so that foreground and background are reversed.

Show Alpha

This option applies to key effects only (such as Chroma Key or Luma Key).

Displays the grayscale alpha channel used to apply the key effect to the foreground and background source. This allows you to examine the problem areas of the key while making adjustments.