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Broadcast Pix
V8.5
4.8 Luma key
Similar to Chromakey, Luminance key or Luma key is a method of removing the
dark portions of a video picture and replacing that with another image with a
different image. A common application for Luma key is in worship productions,
where white song words with a black background from a computer signal input (like
PowerPoint), and then using a Luma key the words are cut out of the image and
placed on a different background, such as a clip from the clip store or over a
camera filming the choir.
One Luma key comes standard with the Broadcast Pix switcher, and as an option 8
sources may have a Luma key assigned to it.
When using a Luma key, all controls are accessed through the Source Controls
PixPad. Also, when a Luma key is applied to a source, the Luma key will appear
everywhere that source is applied to, i.e. program, preview, key, aux, etc.
4.8.1 Activating & Adjusting the Luma key
1.
Place the source which is to be Luma keyed 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 sources row. This example will
assume Key 2 is the desired location. You may Luma key any external live
source, or any clip from within either channel of clipstore.
2.
Then bring Key 2 onto preview, by pressing the
[Key 2 Transition]
button.
3.
Select the
[Controls]
button, in the destination row of the control panel,
and then the appropriate
[source]
button of the source you are keying in
the source row, as described in section 4.6.
The PixPad will change and show one of the following:
4.8
External Live Source Clip Source