Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 112)

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9. After the luma key settings are properly configured, press the Key 1 PGM or Key 1 PVW
button to place the text image on the Program screen or the Preview screen respectively.
7.3 Insertion of People onto Backgrounds (Chroma Key)
The Chroma Key feature of the SE-4000 is easy
to use. Typical Blue and Green screen studios
can be quickly incorporated into an SE-4000
production.
The following is a quick overview of Chroma
Key basics.
The camera, backdrop and lighting all play an
important role in producing the optimal Chroma Key result. Although the SE-4000 is equipped
with excellent keying controls, it is best to start with a good keyable image.
A good foreground image helps produce a good key
Luma
Keying