app.project.item(index).layer(index).trackMatteType
Description
If this layer has a track matte, specifies the way the track matte is applied.
Type
A TrackMatteType enumerated value; read/write. One of:
TrackMatteType.ALPHA
TrackMatteType.ALPHA_INVERTED
TrackMatteType.LUMA
TrackMatteType.LUMA_INVERTED
TrackMatteType.NO_TRACK_MAT TE