Documentation
Alpha Blur
VFX Loom 1.0 reference for the Alpha Blur node.
Filters
processing.alphaBlur 
Overview
Blurs alpha coverage while preserving the source RGB exactly.
Coverage-only processor; source RGB is kept exactly, including transparent HDR RGB. Radius zero, no mask, and matching dimensions is identity.
- Category
- Filters
- Internal ID
processing.alphaBlur- Version
- VFX Loom 1.0
Inputs
| Input | Type | Required | Default | Meaning |
|---|---|---|---|---|
| in | Image | Required | — | See the overview for the node's documented behavior. |
| mask | Image | Optional | — | when connected, Source Channel selects the mask coverage; otherwise source alpha is used |
Properties
| Property | Type | Default | Animatable | Range / options | Effect |
|---|---|---|---|---|---|
| Radius | Scalar | .02 | Yes | — | Animatable control; changing it over time varies the node response. |
| Edges | Enum | Black | Not declared | Fade out · Extend · Tile · Mirror | Selects the edges 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 Alpha Blur when the graph needs Blurs alpha coverage while preserving the source RGB exactly.
- Coverage-only processor; source RGB is kept exactly, including transparent HDR RGB. Radius zero, no mask, and matching dimensions is identity.
- Place it after the image or mask it should process, and check its alpha and edge behavior before using the result in a tiled graph.
Notes / limitations
- No step is declared for Radius.