> For the complete documentation index, see [llms.txt](https://docs.mixeffect.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mixeffect.app/automate/osc/messages/upstream-keyers/luma-key-invert.md).

# Luma Key Invert

| Message                          | Description                                              | Arguments |
| -------------------------------- | -------------------------------------------------------- | --------- |
| `/mixeffect/usk/luma/key/invert` | Sets the Invert Key setting for the Luma upstream keyer. | Multiple  |

| Argument   | Type    | Description                                          |
| ---------- | ------- | ---------------------------------------------------- |
| Invert Key | Integer | <p>0 = Off<br>1 = On<br>2 = Toggle</p>               |
| USK        | Integer | One-based index of the Upstream Keyer. Default is 1. |
| M/E        | Integer | One-based index of the Mix Effect Bus. Default is 1. |