app.project.item(index).mainSource.alphaMode
app.project.item(index).proxySource.alphaMode
Description
The alphaMode attribute of footageSource defines how the alpha information in the footage is to be interpreted.
If hasAlpha is false, this attribute has no relevant meaning.
Type
An AlphaMode enumerated value; (read/write). One of:
AlphaMode.IGNORE
AlphaMode.STRAIGHT
AlphaMode.PREMULTIPLIED