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green screen

Posted: Wed, 20th May 2009, 5:13pm

Post 1 of 4

FXhomer88252

Force: 1200 | Joined: 16th May 2009 | Posts: 2

PhotoKey 5 Pro User

Gold Member

I took a picture of miniature table top carnival with a green screen as the background so I could import a background of my choice. When placing the new background behind the foreground almost everything looked great! But,every object in the fore ground that was green became the background. How do I fix the green objects to stay as it was just green.(no see-through) ? Can I go to another program to fix this?
Posted: Wed, 20th May 2009, 10:30pm

Post 2 of 4

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

First rule of greenscreen: you can't film green things against a greenscreen. When the green gets removed, all of the green gets removed. the computer doesn't have any way of knowing which green you want to keep and which you don't; it takes all the green. Green elements can be filmed against a bluescreen for keying purposes.

A carnival is going to prove tricky anyway, I'm thinking, as there are so many colors there that some green probably can't be avoided. You may be able to use masks to retain those areas; try to keep the mask right on the edge of the green area for best results. Otherwise, perhaps you could use Photoshop or some other app to selectively change the colors of those green bits you want to keep to another shade, so they can be retained in Photokey.
Posted: Thu, 21st May 2009, 6:52pm

Post 3 of 4

EBC films

Force: 0 | Joined: 8th Apr 2009 | Posts: 19

Member

In after effects they have a simple choker to shrink or enlarge the sides of the image where you have keyed
Posted: Thu, 21st May 2009, 8:49pm

Post 4 of 4

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

True, but even that won't help you select a green item in the midst of your subject and isolate it from the effects of your key.