# AddMix

> A * lutA(a) + B * lutB(a).

| Node | AddMix |
|---|---|
| Menu | Merge › AddMix |
| **Names in each format** | |
| .oink comp (JSON) | `"type": "OC_N_addmix"` |
| .nk script | `AddMix` ([how .nk import works](/docs/nuke-users/nk-import)) |
| Python | `nuke.createNode("AddMix")` |
| Assistant (MCP) | `create_node(type="AddMix")` |
| Tab search | `addmix`, or its initials `am` |

![AddMix properties](/shots/nodes/addmix@2x.webp)

## Inputs and outputs

| Port | Name | Type |
|---|---|---|
| input 0 | A | image |
| input 1 | B | image |
| input 2 | mask | image |
| output 0 | Image | image |

## Knobs

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

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `a_channels` | A | text | `rgba` |  | `A` | Layer taken from A |
| `b_channels` | B | text | `rgba` |  | `B` | Layer taken from B |
| `output` | output | text | `rgba` |  | `output` | Layer written: rgba, rgb, alpha or any layer name |
| `premultiplied` | premultiplied | bool | `false` |  | `premultiplied` |  |
| `nonlinear` | nonlinear | bool | `false` |  | `nonlinear` |  |
| `lut` | lut | text | `{A {curve 0 1} B {curve 1 0}}` |  |  |  |
| `mask_channel` | mask | menu | `none` | none, rgba.alpha, rgba.red, rgba.green, rgba.blue |  |  |
| `invert_mask` | invert | bool | `false` |  | `invert_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 |  |  |  |  |

## Knob names in .nk scripts

| .nk knob | Knob here |
|---|---|
| `A` | `a_channels` |
| `B` | `b_channels` |

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


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Sources: opencomp_core/nodes/merge/addmix.py, opencomp_electron/src/components/properties/knobSchema.ts, opencomp_core/nk/mapping.py