The Alpha Glow effect adds color around the edges of a masked alpha channel. You can have a single color either fade out or change to a second color as it moves away from the edge.

Glow slider

Controls how far the color extends from the alpha channel edge. Higher settings produce larger glows (and can cause very slow processing before playback or export).

Brightness slider

Controls the initial opacity of the glow.

Start Color

Shows the current glow color. Click the swatch to choose another color.

End Color

Lets you add an optional color at the outer edge of the glow.

Fade Out

Specifies whether the colors fade out or stay solid.