Transfer Modes and Opacity

Starglow offers controls for compositing the glow into the source image using Source Opacity, Starglow Opacity and a Transfer Mode pop-up menu.
Transfer Modes
Starglow output can be composited with the original image using a subset of After Effects' built-in transfer modes. By default, Transfer Mode is set to Screen, which brightens the darker colors in the output while preserving brights. Starglow offers the following modes: None, Normal, Add, Multiply, Overlay, Soft Light, Hard Light, Color Dodge, Color Burn, Darken, Lighten, Difference, Exclusion, Hue, Saturation, Color and Luminosity.
Source Opacity
Source Opacity sets the opacity (the opposite of transparency) of the source. The default value of 100 uses the full brightness of the original source.
Starglow Opacity
Starglow Opacity controls the opacity of the entire glow effect. A setting of zero will result in no glow at all; a setting of 100 will yield the maximum glow effect.
Below are examples of some of the different Transfer Modes.

None | Normal
Add | Mulitply
Screen | Overlay
Soft Light | Hard Light
Color Dodge | Color Burn
Lighten | Darken
Difference | Exclusion
Hue | Saturation
Color | Luminosity