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#1 dgdoinggood

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Posted 16 December 2005 - 03:14 AM

How do greenscreens work and can they be done on the cheap? I need a shot of the characters in a hot air balloon.
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#2 David Mullen ASC

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Posted 16 December 2005 - 03:42 AM

Depends on how wide the shot is. Are the subjects framed head-to-toe (if you could see through the basket)? Waist-up? Chest-up?

Sounds like you need to establish them in the basket, so at least mid-basket up. This might require something as big as a 20'x20' greenscreen, which means renting the 20'x20' greenscreen, a 20'x20' frame, large combo stands with frame holders, rope, lots of sandbags, and a crew that knows how to set it all up. You could shoot outside in sunlight though. You may getaway with a 12'x12' greenscreen if it's more like a waist-up shot.

Outdoors, large frames of cloth like this act like sails, so you need to set it up in fairly windless conditions with a crew that knows about safety rigging.

If you have to shoot it indoors, you also have lighting issues.

Look up "chroma key" online by doing a Google search to understand the principles. Or read this:

http://en.wikipedia....wiki/Chroma_key

Edited by David Mullen, 16 December 2005 - 03:43 AM.

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#3 dgdoinggood

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Posted 16 December 2005 - 11:16 AM

Kind of ironic that you answerd David as I just read The Delcaration of Independant Filmmaking. Thanks for the info.
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