1st: just coloring in wood, extremely blurred. 2nd: obviously fake. 3rd: layered in photoshop. 4th: has enough color in the silhouette to just be a regular human. 5th: looks almost like a painting. 6th: You see the whitish patches on the other tree trunks? That looks like two trunks close together.
Either fake a shadow or accidental double exposure if you can still do that on cameras. All the same they are quite good. Don;t know about the last one. dnguyen can you repost the link for it I'm intrigued as to what it is.
Notice that there are a lot of random white spots though. And if you look closely, you can barely see roots. Also, it could be glare, or a piece of trash or something. I just doubt it's a ghost because we can't exactly identify what it is.
I believe in ghosts. The second one was made in photo shop. I know how to do that. The 4th one was a painting. And what were your sources? Any body could just mess around with a picture until it looks right. I will post a picture that I messed around with eventually. As soon as I can get on my lap top.
It looks pretty fake, because ghosts in photos are typically characterized as having a face of some sot, and those are just like white lumps. The photography is pretty good though.
I hate to spoil the fun, but those are all fake, the pictures are all clearly photoshopped or blurred and the images are either to real to be real, or aren't real enough to be real!