Adobe® Photoshop® professional photo editor you can use tools such as Motion Blur and move layers of the image in opposite directions to create that Ghostly effect. You know if the person that created the apparition had ever seen a real Ghost they might be able to reproduce it. Then again, the real thing is rare, and fakes are easily recognizable.
People have been faking ghosts since the advent of photography. Here Mary Todd Lincoln wife of President Abraham Lincoln after his death had this picture taken by a spiritualist photographer. The charlatans of the pass exist today. Of course this is made easier with modern editing software.
Computer Generated Video Ghosts
Most inexpensive video editing software includes ‘Green Screen Special Effects’ also known as ‘Chroma Key Effects.’ The green screen is used to introduce a recorded image in front of the screen with let's say someone walking around with a sheet over them, by adjusting the chroma key effect you can add and then fade the length of the footage in the segment just enough to give it that ghostly appearance.
Then of course there is Pepper's ghost an illusionary technique discovered by Scientist and Scholar Giambattista Della Porta in his work of 1584, and the effect was first used successfully by John Pepper in the theatre production of Charles Dickens's 'The Haunted Man'. Everyone has seen this effect used in the Haunted House at Disneyland. It is simply a reflection on the glass. The image takes on a transparent appearance. Take a picture of the glass, and you have your ghost.
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