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>>>>> "Brian" == Brian K Berger <brian_berger@juno.com> writes:

    Brian> On Thu, 7 Nov 1996 08:06:00 -0600 (CST) "Tyler G. Nally"
    Brian> <tgnally@prairienet.org> writes:
    >> On Wed, 6 Nov 1996, Richard Masoner wrote:
    >> 
    >>> > o what happens if the actor is wearing a blue suit?
    >>> Superman wore > blue :-}
    Brian> The Boston Musuem of Science had a display of them doing
    Brian> this very thing and told how if the reporter had blue eyes
    Brian> then it seemed as if his head were hollow. They had special
    Brian> contacts for such cases. Blue stripes in the kids of the
    Brian> audience yielded similiar results with a moving "live map"
    Brian> super imposed not only directly behind them but also on the
    Brian> bands of blue on their shirt. Hollywood also did this in
    Brian> reverse and made a few invisible man movies and the
    Brian> snippets were shown how the man then appeared to disappear
    Brian> by disrobing. I do not know if the exhibits hall still has
    Brian> these exhibits but have noticed lately ( I pass the Musuem
    Brian> every day on the way to work) that there is now a Omnimax
    Brian> film on Special Effects.

    Brian> Brian Berger Manchester, NH Brian_Berger@JUNO.COM

Well, now that I think about it, this is just the color version of the
old black and white special effect created by the "montage amplifier".
This circuit was used exactly as described, only they used black
instead of blue.  The video signal was the run through a detector and
a Schmidt trigger and the output of the Schmidt trigger operated a
video MUX to switch between the actor and the scenery.  I know about
this device which was invented around 1950 by General Electric because
my father helped develop it :->

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