1) Switching a video with blue or green background to PVW window, and turn on the Chroma Key. Then
enter into the Key menu to configure the value of Chroma Key. Using CUT, AUTO, or T-Bar to switch the
image to overlay in the PGM window.
2) When you press Chroma Key button, indicator turns on and menu enter into the key setting interface
as below image. The KEY background can be switch between Green and Blue. The color gamut of the
Chroma Key can be set from the menu by the knob.