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000806_owner-lightwave-l _Thu Apr 27 15:34:07 1995.msg
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From: alan.chan@oubbs.telecom.uoknor.edu
Message-ID: <9504262238.0VSRK02@oubbs.telecom.uoknor.edu>
Date: Wed, 26 Apr 95 22:38:08
Subject: RE: YET ANOTHER SUGGESTION N
To: lightwave-l@netcom.com
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> Yes. Even without interactive contrast--or maybe we should call it
> edge
> detection--there has to be some user feedback just to calibrate for
> the
> matte color, I would think. I haven't seen Ultimatte, so I don't
> know
> how much the user typically does, but Mark Thompson is encouraging
> me to
> put my money where my mouth is (in a nice way, of course), so I'm
> playing
> around with a blue screen image to see what I can do. So far, it
> looks
> like HSV gets you most of the way there, but for best quality you
> need
> user tweaking, or a smarter algorithm, or (probably) both.
The Ultimate guy at NAB showed me actual alpha, where the "edge", especially in
parts like human hair, wasn't just a straight key or video, but a transparency
range. And then he adjusted a knob which literally adjusted the contrast of the
image, either making a sharper distinction or a really really bad key.....
AC