Tutorial: Ultimate Greenscreen/Chroma Key How-To
This is a comprehensive tutorial for chroma keying and greenscreen work. I will be adding to it as new tools and techniques are made available.
This set is a four part tutorial that covers shooting for chroma key, keying your footage, converting to transparent flash and installing the player. Any questions? Feel free to ask them in the fourm.
Shooting for Chroma Key
The first thing you need to do is video yourself against a green screen. The screen should be even, smooth and lit to produce rich color. Here are some tips that will help produce excellent results:
- Use a wrinkle-free screen (green is best for video)
- Light screen evenly
- Position talent at least 3 feet from screen
- Use rim light on talent
- minimize spill of green on talent
- less (light) is more
Budget Setup (what you can start with):
The idea here is that the talent lighting will illuminate the background enough to pull a key. I've done it, it works, it's inexpensive. The diffusion is critical to minimize the shadows on the background and soften the light on the talent.
Optimum Setup (what I use):
The rim light should be placed high and angled down on to the talent. This adds a slight rim of light that helps when you go to key and also when compositing.
Key and Fill light are film terms. Key refers to the main light and fill, well that "fills in the other side. Why not have two lights or one and light head on? Well the talent looks best when there is some 'modeling' or 'shape' to the face. Ideally, you want a nice round look and not a flat look that comes with one main light or two lights of equal strength.
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