Documentation
Set Alpha
VFX Loom 1.0 reference for the Set Alpha node.
Color
processing.setAlpha 
Overview
Combines an image's RGB with alpha from another image.
Keeps source RGB and writes straight alpha from the selected coverage source.
- Category
- Color
- Internal ID
processing.setAlpha- Version
- VFX Loom 1.0
Inputs
| Input | Type | Required | Default | Meaning |
|---|---|---|---|---|
| image | Image | Required | — | See the overview for the node's documented behavior. |
| alpha | Image | Optional | — | coverage source; if unconnected, the Image input is used |
Properties
| Property | Type | Default | Animatable | Range / options | Effect |
|---|---|---|---|---|---|
| Mode | Enum | Replace | Not declared | Replace · Multiply | Selects the mode behavior; each option changes the operation described in the overview. |
| Source Channel | Enum | Alpha | Not declared | Alpha · Luminance · Red · Green · Blue | Selects the source channel behavior; each option changes the operation described in the overview. |
Outputs
| Output | Type | Meaning |
|---|---|---|
| out | Image | The production node output described by the overview. |
Usage
In practice
- Use Set Alpha when the graph needs Combines an image's RGB with alpha from another image.
- Keeps source RGB and writes straight alpha from the selected coverage source.
- Use it after a source or scalar field, then send the adjusted image or colour value to a downstream composite or material stage.