How is this video effect done?

[Qacer]

I found this video on Google: Invisible

How is this effect done?

My first thought was that he eliminated some of the colors using his video editing tool, but if he does that, then the background should be wiped out as well.

 

[SlitheryDee]

Probably took a separate video of the background with nothing there and somehow and somehow combined it with the video of him and the cloak. I don't know how he made it only show through on the cloak, but I'll bet it's less difficult that it would seem with the right tools.

 

[pulse8]

The sheet is green so they probably just key that color. The background when they key out the sheet is just a plate that was shot with no one in it.

 

[Qacer]

I thought about the background, too. But you can clearly see shadows.

 

[LS20]

2 separate layers
use transparency on the top layer (with the cloak)

 

[pulse8]

Originally posted by: LS20
2 separate layers
use transparency on the top layer (with the cloak)

Except that only the cloak disappears. The person does not until they are wrapped in the cloak.

 

[SlitheryDee]

Originally posted by: Qacer
I thought about the background, too. But you can clearly see shadows.

What you mean on the background? Of course you can see the shadows. The majority of what you see is from a clip of him holding an ordinary sheet which casts a shadow on the background. The only place that the empty background shows through is on the sheet itself.

I'd think that what you're describing is actually a flaw in his method since a real invisible cloak wouldn't cast such a pronounced shadow.

 

[AccruedExpenditure]

It's easy... Two layers, chroma key the green sheet on the top layer, increase transparancy.

 

[destrekor]

Originally posted by: AccruedExpenditure
It's easy... Two layers, chroma key the green sheet on the top layer, increase transparancy.

and the two layers are two distinct videos, yes? So that the bottom layer video is only able to be seen when the green sheet is on the screen, and that sheet itself is pegged to be transparent to the layer underneath?
Sounds relatively simply actually.

 

[Qacer]

That makes sense now. Not that bad.

 

[AccruedExpenditure]

Originally posted by: destrekor
<div class="FTQUOTE"><begin quote>Originally posted by: AccruedExpenditure
It's easy... Two layers, chroma key the green sheet on the top layer, increase transparancy.</end quote></div>

and the two layers are two distinct videos, yes? So that the bottom layer video is only able to be seen when the green sheet is on the screen, and that sheet itself is pegged to be transparent to the layer underneath?
Sounds relatively simply actually.

Yes, exactly.