When you key an image or an image sequence, you can use a keyer or a collection of keying tools to generate a matte or remove color spill from a shot. You may also need to generate more than one key to achieve the desired result.

To access the Keying tools:

1. Press the tilde key (~) or middle-click to display the Gate UI.
2. Swipe through the east gate to display the Tools & Views tab.

   

3. Expand the Keying tool folder to access the Keying tools.

   The Keying tools include Color Curves, Diamond Keyer, the Difference tool, and Luma Keyer.

To add a keying tool to the process tree:

1. From the Tools & Views tab, drag a keying tool to the process tree in Schematic.
2. When the connection is highlighted, release the mouse.

   The keyer tool is added to the process tree.