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Chroma Keying
N.B. In order to use the Chroma Key function the SE-900 must be fitted with a Chroma Key board.
See I/O Card Options on Page 13 for more details.
Overview
Chroma Keying is punching out a coloured background and replacing it with an alternative. It is often referred
to as Green Screen, or Blue Screen, as these are the two colours most often associated with the effect.
You will frequently see the effect in use for weather forecasts, or virtual newsrooms.
This is a basic example:
Studio Shot on Green Background
Video Track for Background
Combined Shots = Chroma Key
The SE-900 can be used to Chroma Key in two different ways, Standard Chroma Keying or Chroma Key
Sync.
Standard chroma keying allows up to four channels to be set up for chroma keying while the rest of the
channels can be used conventionally. The chroma key source can be keyed over any of the other sources.
Chroma key sync mode allows pairings to be set and stored. Up to four pairs can be set, in the example
below CAM 1 is paired with CAM 5, CAM 2 with CAM 6, CAM 3 with CAM 7 and CAM 4 with CAM 8. Once
these pairs are set, they are switched as a pair, so the foreground and background images are both switched
simultaneously. This is ideal for virtual studio work.
With Standard Chroma Keying up to four channels
can be set for chroma keying, the SE-900 performs
as normal.
With Chroma Key Sync foreground and background
pairs are set up and they switch together.
Chroma Key Sync is ideal for virtual studio set ups. Four camera angles with matching backgrounds.
