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V1.1
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, etc. Only external live
sources and clips may have chromakey applies 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 Key by
pressing the
[Key Select]
button of that key in the destination row and then the
[source]
button for the desired camera in the source row. This example will
assume Key 2 is the desired location. You may Chromakey any external live
source, or any clip from within the clip store.
2.
Then bring Key 2 onto preview, by pressing the
[Key 2 Transition]
button.
3.
Select the
[Controls]
button, in the Device Select of the control panel, and
then the appropriate
[source]
button of the source you are keying in the
source row, 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