Xref: utzoo comp.sys.amiga:37413 comp.sys.amiga.tech:6324
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!jgary
From: jgary@ms.uky.edu (James E. Gary)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: Chroma-key (was: Chaining Genlocks)
Message-ID: <12276@s.ms.uky.edu>
Date: 26 Jul 89 03:39:07 GMT
References: <367@cbnewsd.ATT.COM> <7245@cbmvax.UUCP> <15742@pasteur.Berkeley.EDU> <20715@cup.portal.com> <11832@orstcs.CS.ORST.EDU>
Reply-To: jgary@ms.uky.edu (James E. Gary)
Organization: U of Kentucky, Mathematical Sciences
Lines: 27

In article <11832@orstcs.CS.ORST.EDU> bob@jacobs.CS.ORST.EDU.UUCP (robert s. richardson) writes:
>But have no fear!  The A-Squared folks have SOFTWARE that in conjunction
>with their LIVE! board will do rudimentary chroma-key, and I beleive

More info please. I have a LIVE!, but have heard nothing about this.
I saw a demo of a program called something like "Mandela" about a year
ago that had computer graphics interacting with LIVE! images. Is what
you are talking about related to this? Let me see...if I stand against
a high contrast background and digitize in black and white, then I can
have the outline of my body be in the background color and everything
else in another color. I can then super-impose my solid background color
shape on top of a computer generated picture, turn on the genlock and 
have me in live video show through. Yeah, that might work. The problem
I have is that my genlock (from Commodore, you know, the cheap one) shifts
the screen image a few pixels so I won't be lined up well with the 'hole'
in the picture. Do all genlocks have this effect, or is it just the 
Commodore model? Hmm. Now all I have to figure out is how to clip my
shape out of the digitized screen and overlay it on the background graphics.
That should be a simple blit operation, shouldn't it? This sounds like
fun! Time to dig into live.library! Hints and suggestions welcome. Also
any pointers as to where the "mandela" software may be obtained.

-- 
+-----------------------------------------------------------+
| James Gary   jgary@ms.uky.edu | Yeah, I have a light,     |
|    University of Kentucky     |  my face and your butt!   |
+-----------------------------------------------------------+