> 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/chroma-narrow.md).

# Chroma Narrow

| Message                    | Description                                          | Arguments |
| -------------------------- | ---------------------------------------------------- | --------- |
| `/mixeffect/chroma/narrow` | Sets the narrow parameter for the legacy Chroma USK. | Integer   |

| Argument | Type    | Description                            |
| -------- | ------- | -------------------------------------- |
| Choice   | Integer | <p>0 = Off<br>1 = On<br>2 = Toggle</p> |