How to Chroma-Key - Keying lighting and techniques

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How to Chroma-Key - Keying lighting and techniques

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digiphoto

Newbie

22. September 2004 @ 19:34

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1. What color Chroma key should I use - Blue or Green?
Choose a color that is NOT prominent in your subject. For example, if the subject has green clothing on, choose the Blue Chroma key Screen / Backdrop. If the subject has blue clothing, you would then choose the Green Chroma key Screen / Background. Many photographers have both a Blue and Green Chroma key backdrop for this reason.
2. How should I light the Chroma key Screen or Background?
Remeber two things .. (1) Keep the lighting flat on the subject - using two lights at 45 degree angles, (2) make sure there's enough seperation or space between the subject and the blue or green screen/background. One of the biggest mistakes is to allow the light spill over. Another advantage of space between the background and the subject is the color of the background won't bleed or spill over onto the subject (you don't want blue or green halos around your subject).
3. What is better - Fabric Chroma key or Paper or Paint?
They each have their strong points - you'll have to decide what's best for you.
The Fabric is (1) easier to transport and store, (2) easier to shoot and is (3) washable.

Paper is cheaper initially but will have to be replaced more often as it gets damaged (so it can actually end up costing more). Paper is also large and bulky to transport. It's best in a studio and not really good for location work.

Paint is great if you have a studio with a cove. You can paint the cove and have a chroma key the size of the cove. Not all of us have this luxury but it is an option.

To find out more about Chroma Key Techniques - visit http://www.chroma-key.com/chroma-key_faq.html or http://www.chroma-key.com/

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