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000407_owner-lightwave-l _Mon Apr 17 23:03:57 1995.msg
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From: <ALANL%wpmail@sppd.stpaul.gov> (Alan J. Lloyd )
To: <LIGHTWAVE-L@netcom.com>
Subject: Yet another suggestion needed... (SMTP
Date: Mon Apr 17 12:10:02 1995
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Adrian Onsen wrote:
> ...the BLUE-screen effect...(snip)...shoot one object
> against a blue screen and paste that object onto another
> piece of video...
The easy way is with a chromakeyer/Ultimatte. If you don't have
one, you're going to have to do your own matting. It involves
clipping out the blue BG (HINT: Be sure you're not putting any
blue in the "foreground" object or it too will clip out) leaving
your foreground abject isolated in space.
Any way you do this w/o a keyer, it's going to be a lot of work.
You may (may!) be able to save it out as an image sequence and do
"transparency" compositing, but if so, you're better off shooting
against a piece of black velour and being very careful with
lighting, especially use a good backlight for definition.
If you're doing blue-screen, try putting a piece of 1/4 CTO on
the backlight, blue bounce can "dirty-up" your edges otherwise.
It really cleans up the blue-screen process and doesn't really
change the look of your scene. (1/4 CTO is a _mild_ orange
color-correction, and re-colors blue "bounce" from a backdrop so
it doesn't affect the compositing process.)
-----------------------------------------------------------------------------
Alan Lloyd
alan.lloyd@stpaul.gov
>> All standard disclaimers apply. Non-standard disclaimers
available on request.
-----------------------------------------------------------------------------