Green Screen Tutorial
"Chroma Keying Tutorial" by Rob Nixon,
Media Junction's Head of Post Production.
Chroma keying is the process of replacing one part of a video signal (normally the Green studio background) with another to produce a composite image. This gives the illusion of the filmed person being somewhere else. It has become a common effect in Television Broadcasting, traditionally used for News Interviews and the Weather report, it is now seen extensively in Feature Films, Music Promos, Video for Web and Commercials. If you need your subject to look like they are sitting in a New York Hotel when they are being filmed in London or you need to drop a presenter over a website then a Green Screen shoot is the answer. It’s how Superman flew through the air and James Bond can stand inside an exploding building (and live to tell the tale!)
Chromakeying techniques can be used on location filming but it is predominantly used in studios where a greater control of lighting can be obtained and a higher quality ‘green’ background is available. To produce filmed content capable of being ‘keyed out’ ( this is the process of separating the filmed subject from the green – similar to a mask or alpha channel ) it is essential that care is taken with lighting and you produce an even, shadow free background with a good level of saturation and correct hue. Badly shot and lit material will prove difficult to edit and time consuming to repair.
For further information, please visit our dedicated website for editing and post-production at: http://www.EditandPostSoho.com/
Please visit our dedicated Green Screen Soho website at:
www.GreenScreenSoho.com