thats what i have been having trouble with, trying to get the ghost to appear correctly, i'm trying to get it to work with a cloud layer, through camera projection, with a separate camera to project it, and its just not appearing.
when i render it looks like i have a thick fog.
i also overlooked a problem with using ghost photographs for a masks, they don't make very good images that can be used for masking, with as most of them have a non-black background.