# Glow2

> Makes bright areas glow — the parts above tolerance are blurred (size, filter, quality as Blur), tinted, saturated, scaled by brightness and added to the image.

Makes bright areas glow — the parts above tolerance are blurred (size, filter, quality as Blur), tinted, saturated, scaled by brightness and added to the image. effect only gives the glow alone. Width channel lets another channel scale the glow size per pixel; crop to format works as in Blur.

| Node | Glow2 |
|---|---|
| Menu | Filter › Glow |
| **Names in each format** | |
| .oink comp (JSON) | `"type": "OC_N_glow"` |
| .nk script | `Glow2`, also imports `Glow` ([how .nk import works](/docs/nuke-users/nk-import)) |
| Python | `nuke.createNode("Glow2")` |
| Assistant (MCP) | `create_node(type="Glow2")` |
| Tab search | `glow2`, or its initials `g2` |

![Glow2 properties](/shots/nodes/glow@2x.webp)

## Inputs and outputs

| Port | Name | Type |
|---|---|---|
| input 0 | Image | image |
| input 1 | mask | image |
| output 0 | Image | image |

## Knobs

Panel tab **Glow**, in panel order.

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `channels` | channels | menu | `rgb` | rgba, rgb, alpha, all, none |  | Layer the op applies to: rgb, rgba, alpha, all, none, <layer> or <layer>.<ch> |
| `tint` | tint | colour ×3 | `1, 1, 1` | 0 to 4 | `tint` |  |
| `tolerance` | tolerance | float | `0` | 0 to 1 | `tolerance` |  |
| `brightness` | brightness | float | `1` | 0 to 5 | `brightness` |  |
| `saturation` | saturation | float | `1` | 0 to 4 | `saturation` |  |
| `width_channel` | width channel | text | `none` |  | `W` | Nuke W: a per-pixel glow size (stored only) |
| `nonlinear` | non linear | bool | `false` |  | `nonlinear` | Nuke non linear (with the width channel; stored only) |
| `effect_only` | effect only | bool | `false` |  | `effect_only` |  |
| `size` | size | wh ×2 | `15, 15` | 0 to 500 | `size` |  |
| `filter` | filter | menu | `GAUSSIAN` | BOX (box), TRIANGLE (triangle), QUADRATIC (quadratic), GAUSSIAN (gaussian) | `filter` |  |
| `quality` | quality | float | `15` | 0 to 100 (integer) | `quality` |  |
| `crop` | crop to format | bool | `true` |  | `crop` |  |
| `mask_channel` | mask | menu | `none` | none, rgba.alpha, rgba.red, rgba.green, rgba.blue |  | Mask channel, e.g. rgba.alpha (none = no mask) |
| `inject` | inject | bool | `false` |  |  | Copy the mask into mask.a for nodes downstream |
| `invert_mask` | invert | bool | `false` |  | `invert_mask` |  |
| `fringe` | fringe | bool | `false` |  |  | Only apply the effect at the edges of the mask |
| `mix` | mix | float | `1` | 0 to 1 | `mix` |  |

### Other knobs (Python, .nk and the assistant; not on the panel)

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `gl_color` | Viewer Controls Color | float ×3 | `0, 0, 0` | 0 to 1 |  |  |
| `postage_stamp_frame` | Static Frame | int | `1` | -2147483648 to 2147483647 |  |  |
| `lifetimeStart` | Lifetime Start | int | `0` | -2147483648 to 2147483647 |  |  |
| `lifetimeEnd` | Lifetime End | int | `100` | -2147483648 to 2147483647 |  |  |
| `useLifetime` | Use Lifetime | boolean | `false` |  |  |  |
| `cached` | Cached | boolean | `false` |  |  |  |
| `bookmark` | Bookmark | boolean | `false` |  |  |  |
| `dope_sheet` | Dope Sheet | boolean | `false` |  |  |  |
| `clone_group` | Clone Group | string |  |  |  |  |
| `link_source` | Link Source | string |  |  |  |  |
| `link_overrides` | Link Overrides | string |  |  |  |  |
| `split_views` | Split Views | string |  |  |  |  |
| `unpremult` | (Un)premult by | enum | `none` | none, rgba.alpha |  |  |
| `invert_unpremult` | invert | boolean | `false` |  |  | (Un)premultiply by 1 - alpha |

## Knob names in .nk scripts

| .nk knob | Knob here |
|---|---|
| `W` | `width_channel` |

Other .nk knobs use the same name here. See [.nk import](/docs/nuke-users/nk-import).

## Examples

Open these from **Help › Examples…**, or from the **?** menu in this node's Properties panel.

- **Glow** (`examples/filter/glow.oink`): Glow adds a blurred copy of the bright parts back on top. Tolerance sets how bright a pixel must be to glow.


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Sources: opencomp_core/nodes/filter/glow.py, opencomp_electron/src/components/properties/knobSchema.ts, opencomp_core/nodes/help/glow.md, opencomp_core/nk/mapping.py