Thread: Chroma keyers
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Old 07-07-2015, 01:38 AM   #2
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Join Date: May 2007
Location: Four Marks, Alton, UK
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I can give you some general rules.

Good green screen keys are about lighting and presenter position relative to the screen.

The presenter should be at least 2 feet or just under a metre away from the green screen to avoid green "splash back" from the screen or to avoid shadows, and preferably with a fill light on a dimmer from above the screen to light the back of her head. (it gives a warm glow 3D effect in a 2D plane).

Think about it this way. Use one set of lights to evenly light the screen and another set of lights to light the presenter as if the green screen wasn't there.

Edges are generally governed by the quality of the video camera 4:2:0 will not give as cleaner edge as a camcorder that records in 4:2:2 as the colour resolution is much better in 4:2:2.

Fuzzy or "wild hair" can be more of a problem especially with the presenter too close to the green screen and Robus Key is better than the Edius one at softening the edges, which can help in difficult situations.

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