Values
Additive
Additive glow blending mode. Mostly used for particles, glows (bloom), lens flare, bright sources.
Screen
Screen glow blending mode. Increases brightness, used frequently with bloom.
Softlight
Soft light glow blending mode. Modifies contrast, exposes shadows and highlights (vivid bloom).
Replace
Replace glow blending mode. Replaces all pixels' color by the glow value. This can be used to simulate a full-screen blur effect by tweaking the glow parameters to match the original image's brightness.