> 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

Sets the narrow parameter for the legacy Chroma USK. This is available on certain ATEM switchers such as the ATEM Television Studio HD, ATEM Television Studio Pro, ATEM Production Studio 4K, ATEM 1 M/

| 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> |