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000795_owner-lightwave-l _Thu Apr 27 06:31:00 1995.msg
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Date: Wed, 26 Apr 1995 15:58:29 -0700 (MST)
From: Ernie Wright <ernie@gaspra.pd.com>
To: lightwave-l@netcom.com
Subject: RE: YET ANOTHER SUGGESTION N
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J. Eric Chard, quoting me, wrote:
>> I suspect this isn't discussed in the context of digital graphics
^^^^^^^^^^^^^^^^^^^^^^^^^^
>> much because it's only a problem when live video is involved, and the
>> analog approach for video has been working fine for three decades.
>
> Who are you, and what have you done with Ernie!???
>
> Chroma keying is extremely powerful and useful in creating digital
> traveling mattes in compositing operations. This includes
> keying digitized image streams.
I was thinking of the CG literature, where treatment of alpha channels
and matte techniques tends to wander off into the arcana of Boolean
algebra rather than attack the messy qualitative details of compositing.
You're right: it's important, powerful and used all the time, but the
literature doesn't really reflect this, and I think that's because it's
a subject that crosses disciplines, and because, as Mark suggested,
some of the methods being used now are proprietary.
But it's NOT because there's any unknowable black magic going on.
> Ernie Wright, reeling from illicit drug usage ...
Ha. There's probably a DIS guy at NSA sticking this in my file right
now...
- Ernie