OBS Studio Blending Modes Explained

In OBS Studio, blending modes are powerful rendering settings that dictate how a source merges visually with the sources layered directly beneath it in your scene. This article explains the mechanics of these blending modes, details how they alter the appearance of layered sources, and provides a quick guide on how to apply them to elevate your live stream or video production value.

What Are Blending Modes?

By default, when you stack sources in your OBS Studio Sources list, the source at the top of the list completely covers any sources below it (unless the top source has transparency). Blending modes change this behavior. They use mathematical formulas to mix the pixel color and brightness values of the top source (the blend layer) with the sources underneath it (the base layer). This allows you to create complex visual effects, seamless overlays, and artistic textures directly inside your broadcasting software.

How Blending Modes Affect Layered Sources

OBS Studio offers several blending modes, each producing a distinct visual interaction between your layered sources:

• Normal: This is the default setting. The top source is fully opaque and covers the bottom source, showing no interaction between pixels other than standard alpha-channel transparency.
• Addition: This mode adds the color values of the top source to the bottom source, resulting in a much brighter image. It is ideal for light leaks, fire, explosions, or magic effects, as black areas in the top source become completely invisible.
• Subtract: This mode subtracts the color values of the top source from the bottom source, darkening the image. It is useful for creating dramatic shadow effects or high-contrast, moody visuals.
• Screen: Similar to Addition but softer, Screen multiplies the inverse of the color values. It brightens the underlying scene while preserving details, making it perfect for blending semi-transparent overlays, dust particles, or fog.
• Multiply: This mode multiplies the color values of both layers, always producing a darker result. White areas of the top source become transparent, making Multiply excellent for applying grimy textures, vignettes, or dark borders to your feed.
• Lighten and Darken: Lighten compares the pixels of both layers and keeps only the lighter pixels, while Darken does the opposite, keeping only the darker pixels.

How to Apply Blending Modes in OBS Studio

Applying a blend mode to a source in OBS Studio is a straightforward process:

1. Open OBS Studio and select the scene containing your layered sources.
2. In the Sources dock, right-click the source you want to blend (the top layer).
3. Hover your cursor over Blending Mode in the context menu.
4. Select your desired mode (e.g., Screen, Multiply, or Addition) from the drop-down list.

The visual change will apply instantly in your viewport, allowing you to experiment with different options until you achieve the desired aesthetic.