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 Simple Additive Compositor from the Layer Plug-in list.
The Simple Additive compositor composites the two images using the second image's intensity (HSV value) to determine transparency. Areas of full intensity (255) are opaque; areas of zero intensity are transparent; and areas with intermediate transparency are translucent.