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Broadcast Pix
V3.0
4.7 Chromakey
Chromakey is a method of removing a solid background color and replacing it with
a different image. The most common application for Chromakey (also called green/
blue screen) is in news/weather production, where a person in front of a blue wall
or a green wall is taped with video camera, and then using a Chromakey the
person is cut out of the image and placed on a different background, such as a
weather map. One Chromakey comes standard with the Broadcast Pix switcher,
and as an option multiple sources may have a Chromakey assigned to it, ideal for
creating virtual sets. When using a Chromakey, all controls are accessed through
the Source Controls PixPad. Also, when a Chromakey is applied to a source, the
chromakey will appear everywhere that source is applied to, i.e. program, preview,
key, aux, etc. If PowerAux is enabled, Key 6 may not have a Chromakey applied to
them.
The most important element to a successful Chromakey is even lighting. Not only
do you need to light your subject with standard 3-point lighting (Key, Fill & Back
light) it is also important to evenly light your Chromakey wall (the background of the
subject). Once that is accomplished you are now ready to use the Chromakey
feature.
4.7.1 Activating the Chromakey
1.
Place the source which is shooting the subject to be Chromakeyed in a Keyer by
pressing the
[Key Select]
button of that key in the destination row and then the
[Source]
button for the desired camera in the sources row. This example will
assume Key 2 is the desired location. You may Chromakey any external live
source or any clip from within the clipstore on any key.
2.
Then bring Key 2 onto preview, by pressing the
[Key 2 Transition]
button.
3.
Select the
[Source]
PixButton you are keying, in either Display Row of the control
panel, as described in the previous section.
The PixPad will change and show one of the following:
4.7
External Live Source Clip Source Luma/Chroma Controls