Chroma-keying out a specific color is done using the “Ultra Key” function, found under the effects menu under “Video Effects” and “Keying.” The Ultra Key allows users to remove a specific color from a clip. To do so, use the eyedropper tool next to “Key Color” and select a color from the video clip.

For a tutorial on how to use Chroma Key, click the Lynda playlist below.

Lynda Playlist: DLL Adobe Premiere Chroma Key:

https://www.lynda.com/SharedPlaylist/18084542cd3946189de4b37639cef1bb