Datavideo HS-4000 Instruction Manual page 129

3. Select the camera source in "Key Source." In this example, we have selected Input 1,
which corresponds to the SDI Input 1 at the rear of the switcher and therefore the port to
which the camera is connected.
4. Adjust the left, right, top and bottom values of "Mask" to set the chroma key range
according to the green or blue backdrop size.
5. Open the Chroma menu to adjust the corresponding chroma keyer parameters. Again in
this example, we have selected Input 1, which corresponds to the SDI Input 1 at the rear of
the switcher.
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