Datavideo SE-4000 Instruction Manual page 58

Outlined below are steps to set key tie with the chroma keyer.
1. First, in the Keyer menu, select the keyer and set it to Chroma. We used Key 1 in this
example.
2. Open the Chroma menu and select Key 1. Select a foreground image from the Key Source
list (the foreground image is usually a person or an object against a green backdrop).
58