What is the luma key  and how is it used in PE4?

How do I used this effect?
Thank you

Are you talking about the setting on the track matte?
The alpha setting bases transparency on the whiteness of the selected layer.
The luma setting bases transparency on the red, green and blue brightness of the selected layer.
It's easier to demonstrate that explain. I suggest you experiment, using multi-colored clip to create your track matte.

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