Alpha Compositor

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Rendering menu > Video Post > Video Post window > Make sure the two child events are in the order you want the Image Layer event to use them. > Select the two events. > Video Post toolbar > Add Image Layer Event > Choose Alpha Compositor from the Layer Plug-in list.

Rendering menu > Video Post > Video Post window > Select an Alpha Compositor > Video Post toolbar > Edit Current Event

The Alpha compositor composites the two images using the alpha channel of the foreground image. The background image appears in areas where the foreground image's alpha channel is transparent.

Procedure

To use the Alpha Compositor filters:

Add two Scene or Image Input events to the queue.
Select both events and assign an Image Layer event consisting of the Alpha Composite Filter.
Select the Image Layer event and click Edit Current Event.