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Meta
Green Diffused
25th February 2010

Chroma key is one of the most popular digital video editing effects.
Using chroma key, you can make virtually ANYTHING happen in your digital video.
Want your video to take place on the other side of the universe? Chroma key is the video editing technique that can take you there in seconds, for nothing.
Chroma key is commonly called green screen. Most people are familiar with the term green screen. That’s where your on-camera talent stands in front of a bright lime green background. Then, through editing, all the lime green is removed from the shot and another image is inserted in its place.
Green screen is the common term, but technically, chroma key is more accurate. Chroma key can use any color, not just green. All it takes is the right equipment to handle the different colors. That flexibility can make life much easier.
Lime green and bright turquoise blue are most often used for chroma key effect because they are opposite on the color spectrum from facial tones. Because it is opposite, the digital removal of one color won’t affect the other. This would be why you never see a weather guesser wearing a lime green dress.
WHAT ABOUT LIGHTING?
In order to make your final chroma key effect look right, you have to shoot it with VERY BRIGHT, DIFFUSED LIGHT. You do not want shadows when shooting something for chroma key. Shadows in the back ground alter the color of your background by making it darker or lighter in spots. To do an effective chroma key, you have to have a VERY CONSISTENT COLOR for your background. Remember, this is the color that will be digitally removed. Any slight variations in the color will affect how well you can remove it and replace it with another image.
During editing, apply the green screen filter to your shot of your on-camera person. The filter is not needed on the image that you will key in.
Then, play with details of the filter, including the tolerance level, the edge thickness and the edge softness. By adjusting these levels individually you will get the chroma key effect to look as good as possible.
Large objects chroma key more easily than tiny ones. Tiny, thin objects are likely to disappear with chroma key. Sometimes you can you this to your advantage and leave a slight edge around thin objects. This can look very nice and if you soften the edge, it will look like a faint glow.
HOW FAR AWAY SHOULD THE ON-CAMERA TALENT BE FROM YOUR GREEN BACKGROUND?
The distance between your on-camera person and the background is not that critical. The important thing is that you do not have shadows on your background. So if your on-camera talent is so close to the background that he is casting a shadow, then add some more distance to eliminate that shadow. But if your light is diffused enough to be shadowless, then you can have your talent very close and it will key just fine.
There you have it, the basics of green screen for video production, which is also called chroma key.
Lorraine Grula has been a well-respected award winning video professional for over twenty-five years. (Yeah, that makes her kind of old.) Lorraine has done virtually every kind of video production imaginable and now shares her expertise on the web. Her blog, http://www.VideoProductionTips.com is full of free information and video tutorials.
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