# Set Luma Keyer

### **Parameters**

* **Index**: The 1-based USK index for the keyer.
* **Mix Effect Block Index**: The Mix Effect Block to change. Default is M/E 1.
* **Fill Source**
* **Key Source**
* **Set Mask**
  * **Enable Mask**
  * **Mask Top**
  * **Mask Bottom**
  * **Mask Left**
  * **Mask Right**
* **Set Pre-Multiplied**
  * **Enable Pre-Multiplied**
  * **Clip**
  * **Gain**
  * **Invert Key**

### Returns

Nothing.