On Fri, 21 Jan 2011 11:02:25 -0500, news wrote:

On Fri, 21 Jan 2011 08:26:08 -0500, mm wrote:


OT? How did they do the double image on the Patti Duke show?

Does anyone know how they showed two of her at the same time? I'm
watching reruns now on an 19" tv now, from one foot away, and I can't
see line or anything. Sometimes they just show the back of the head of
a double for the second one, but other times they show both of them.
Nothing shows and and I don't think they had green-screen electronic
technology then. Was there a physical or photographic method of
separating one moving image from its background and superimposing it on
another?

There was "brightness key" technology in the days of black & white TV
the precursor of color-key (commonly called blue screen, although green
screen is also used). It was used for commercials on the Dinah Shore
Show (among other things). It did require care in lighting the scene
which was to have an insert. One of the comments about the technology
was "Dinah Shore could have wound up with a Chevy in her mouth".

John
Now realizing how many years I have spent in media technology...

Chroma key was what it was known as when color tv debuted.



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