# Transform

> Translates, rotates, scales and skews the image around the center point.

| Node | Transform |
|---|---|
| Menu | Transform › Transform |
| **Names in each format** | |
| .oink comp (JSON) | `"type": "OC_N_transform"` |
| .nk script | `Transform`, also imports `TransformMasked` ([how .nk import works](/docs/nuke-users/nk-import)) |
| Python | `nuke.createNode("Transform")` |
| Assistant (MCP) | `create_node(type="Transform")` |
| Tab search | `transform` |

![Transform properties](/shots/nodes/transform@2x.webp)

## Inputs and outputs

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

## Knobs

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

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `channels` | channels | menu | `all` | rgba, rgb, alpha, all, none | `channels` | Layer the op applies to: rgb, rgba, alpha, all, none, <layer> or <layer>.<ch> |
| `translate` | translate | vector ×2 | `0, 0` | -2000 to 2000 | `translate` |  |
| `rotate` | rotate | float | `0` | -180 to 180 | `rotate` | Degrees, counter-clockwise |
| `scale` | scale | wh ×2 | `1, 1` | 0 to 4 | `scale` |  |
| `skew_x` | skew X | float | `0` | -1 to 1 | `skewX` |  |
| `skew_y` | skew Y | float | `0` | -1 to 1 | `skewY` |  |
| `skew_order` | skew order | menu | `XY` | XY, YX | `skew_order` |  |
| `center` | center | vector ×2 | `960, 540` | 0 to 4096 | `center` |  |
| `invert_matrix` | invert | bool | `false` |  | `invert_matrix` | apply the opposite move. |
| `filter` | filter | menu | `CUBIC` | IMPULSE (Impulse), CUBIC (Cubic), KEYS (Keys), SIMON (Simon), RIFMAN (Rifman), MITCHELL (Mitchell), PARZEN (Parzen), NOTCH (Notch), LANCZOS4 (Lanczos4), LANCZOS6 (Lanczos6), SINC4 (Sinc4) | `filter` | how pixels are resampled, from impulse (no smoothing) through cubic (default) to Lanczos and Sinc4 (most sharpening, 4 px wide). |
| `clamp` | clamp | bool | `false` |  | `clamp` |  |
| `black_outside` | black outside | bool | `true` |  | `black_outside` |  |
| `motionblur` | motionblur | float | `0` | 0 to 4 | `motionblur` |  |
| `shutter` | shutter | float | `0.5` | 0 to 2 | `shutter` |  |
| `shutter_offset` | shutter offset | menu | `START` | CENTRED (centred), START (start), END (end), CUSTOM (custom) | `shutteroffset` |  |
| `shutter_custom_offset` | custom offset | float | `0` | -1 to 1 | `shuttercustomoffset` |  |
| `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 |
|---|---|
| `skewX` | `skew_x` |
| `skewY` | `skew_y` |
| `shutteroffset` | `shutter_offset` |
| `shuttercustomoffset` | `shutter_custom_offset` |

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.

- **Merge over** (`examples/merge/merge_over.oink`): A premultiplied CG render (CandleGlass, alpha 0 with non-zero rgb in places) scaled down and merged over a photo with Merge (over): A over B = A + B * (1 - A.alpha).
- **Transform: translate, rotate, scale** (`examples/transform/transform_basics.oink`): Transform works in Nuke pixels (y up, degrees counter-clockwise, around "center"). The Reformat first puts the photo in an HD frame so the rotated corners have room.


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