> 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-advanced.md).

# Chroma Advanced

Sets the Chroma Advanced upstream keyer. This is available on certain ATEM switchers such as the ATEM Mini line, ATEM Television Studio Pro 4K, and the ATEM Constellation 8K.

| Message                          | Description                                                                                                                                                                    | Arguments |
| -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------- |
| `/mixeffect/usk/chroma-advanced` | Sets the Chroma Advanced upstream keyer. This is available on certain ATEM switchers such as the ATEM Mini line, ATEM Television Studio Pro 4K, and the ATEM Constellation 8K. | Multiple  |

| Argument          | Type    | Description                                          |
| ----------------- | ------- | ---------------------------------------------------- |
| Foreground Level  | Float   | Float from 0 to 100.0.                               |
| Background Level  | Float   | Float from 0 to 100.0.                               |
| Key Edge          | Float   | Float from 0 to 100.0.                               |
| Spill Suppression | Float   | Float from 0 to 100.0.                               |
| Flare Suppression | Float   | Float from 0 to 100.0.                               |
| Brightness        | Float   | Float from -100.0 to 100.0.                          |
| Contrast          | Float   | Float from -100.0 to 100.0.                          |
| Saturation        | Float   | Float from 0 to 100.0.                               |
| Red               | Float   | Float from -100.0 to 100.0.                          |
| Green             | Float   | Float from -100.0 to 100.0.                          |
| Blue              | Float   | Float from -100.0 to 100.0.                          |
| 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. |