The Glow filter creates glows around selected areas of the image.

Light.

To select a preset, choose one from the Presets tab.

Determines the blend mode to be used to create the glow effect.

The glow is added to your image.

The glow is combined with the image using a Screen blend mode. This looks kind of like the Add blend mode, but highlights are retained.

Sets the intensity of the glow.

Sets the softness of the glow.

The Color parameter sets the color of the glow through the use of a standard color picker. The default color is white.

Go to the Color Correct node to see how the Color Correct controls work.

A matte is used to create the glow effect. Go to the Matte section of Common Node Controls to see how the Matte controls work.