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Amiga Plus 1995 #5 & #6
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000663_owner-lightwave-l _Mon Apr 24 01:17:17 1995.msg
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Date: Mon, 24 Apr 95 01:42:45 EST
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In-Reply-To: <9504200814.0BKOM00@oubbs.telecom.uoknor.edu>
(from alan.chan@oubbs.telecom.uoknor.edu)
(at Thu, 20 Apr 95 08:14:20)
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From: mark@fusion.MV.COM (Mark Thompson)
To: lightwave-l@netcom.com
Subject: RE: YET ANOTHER SUGGESTION N
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alan.chan@oubbs.telecom.uoknor.edu asks:
> Is the algorithm patented? How does Ultimatte work?
I believe it is patented but I'm not certain. I have on several occasions
asked around for ANY info or papers on the topic of automatic mask
extraction (such as chroma keying) but have come up with nothing. Doing
it well seems to be a well guarded trade secret.
> Would it be possible to
> look at the blue values from the RGB files and turn it into an 8-bit
> transparency?
Its actually a much more complex problem than it seems and this simple
approach will not do it effectively. Consider that your blue background
is neither a pure full intensity blue, nor is it perfectly uniform. Yet
you want it to matte out completely while still preserving things like
shadows, smoke, fine detail, or translucent surfaces. Pretty tricky stuff.
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*
* Mark Thompson (603) 424-1829 *
* Fusion Films Inc. mark@fusion.mv.com *
* Radiant Image Productions *
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~