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  #1  
Old November 13th, 2008, 02:24 AM
Tim Armes Tim Armes is offline
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Default Compositing techniques

Hi all,

I'm interested in trying to do a few composite image photographs, and I'm looking for some advice from anyone with experience in this area.

In particular, when shooting a model against a backdrop, what colour should that backdrop be? Traditionally the green/blue screen seems to be the best route since it's easy to select the colour for removal and it isn't found in most skin tones. However I can't imagine being able to remove all the green/blue without leaving a fring of colopur around the person, especially in the hair.

Is there a reliable technique here that gives perfect results?

It seems to me that my best bet is to use a white backdrop to avoid the colour fringing problem, and I notice that there are photographers who do exactly this:

http://www.thefstopmag.com/?p=325

Any help you can offer or sites that you can point me to would be greatly appreciated.

Tim
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Old November 13th, 2008, 03:54 AM
Michael Fontana Michael Fontana is offline
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Hi Tim

I haven't done that stuff, but remind some photographer using bluebox, with even a special PS-plugin for it; that was a while ago, I don't know if that plugin still exists.
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Old November 13th, 2008, 11:40 AM
Tim Armes Tim Armes is offline
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Thanks, I'll look into that.
Tim
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  #4  
Old November 13th, 2008, 12:12 PM
Bart_van_der_Wolf Bart_van_der_Wolf is offline
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Quote:
Originally Posted by Tim Armes View Post
In particular, when shooting a model against a backdrop, what colour should that backdrop be? Traditionally the green/blue screen seems to be the best route since it's easy to select the colour for removal and it isn't found in most skin tones. However I can't imagine being able to remove all the green/blue without leaving a fring of colopur around the person, especially in the hair.
Hi Tim,

You'll need some neutral backlighting to avoid the direct reflection of the background color.

Bart
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  #5  
Old November 13th, 2008, 02:06 PM
Asher Kelman Asher Kelman is offline
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Tim,

If you use a blue or green background, make sure that is evenly lit and that the model/object is separated from the background to limit light spill. A light from behind your subject can backlight the edges and overcome spill.

Then removing the background is so much easier in photoshop. Just pick a color that is not important for your model.

A tiny edge blur at the very end may help get enough semi transparent pixels needed for dropping into the new background and making then seem as if they belong.

Asher
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Old November 13th, 2008, 05:21 PM
Luiz Vasconcellos Luiz Vasconcellos is offline
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I do lots of extractions, some links to help:
http://forums.dpreview.com/forums/re...ssage=29955331
http://forums.dpreview.com/forums/re...ssage=29955991
http://forums.dpreview.com/forums/re...ssage=29988872

The tips for chroma keying, see the 'How to set up your chromakey studio '
http://www.digitalanarchy.com/primatte/tips.html
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Old November 13th, 2008, 06:20 PM
Asher Kelman Asher Kelman is offline
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Luiz,

You have made an excellent contribution.

Asher
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  #8  
Old November 14th, 2008, 03:32 PM
Tim Armes Tim Armes is offline
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Thanks Luiz, that's great stuff.

Tim
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