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As
our name says, this site is all about Chroma Key; "The process
of overlaying one video signal over another, the areas of overlay
being defined by a specific range of colour, or chrominance, on the
background signal" (Quantel
Digital Factbook).
We've collected some information on Chroma Key Virtual Sets below,
a staple to an chromakeyer's arsenal. If there is any additional information
missing from these pages that you think is relevant, please feel free
to send an email to info@chromakey.tv.
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A more basic answer than the Digital Factbook gives
is having talent stand in front of a blue or green screen and then
use a device (hardware or software) to remove that color and replace
it with another image or video source. This gives the illusion of
the person being somewhere else, and it's a more common technique
than you might realize. Not only is the weather man being keyed in
front of a green screen, but more and more often field correspondents
and even newscasters are Chroma Keyed.
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A Virtual Set uses green screen keying to create a
set or stage that isn't real, and in some cases could not be. Virtual
Sets are ideal for situations where a real set is too expensive because
of either space, location, or materials cost. Building a football
stadium would be very expensive. Building a football stadium made
of gold on the moon would be impossible, but not with a virtual set.
A small stage covered with green screen and adequate lighting is all
that's needed to put your talent anywhere your imagination wants to
put them. |
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A Virtual Set can be done either live or in post production,
each has advantages and disadvantages. In a live production with something
like an Ultimatte Chroma Keyer
or the keyer in a switcher the two main advantages are that your talent
can see where they are going and you can light your talent for the
set they are in. So your talent doesn't walk through a pillar or desk
and lighting can be fine tuned to match the image they are being Chroma
Keyed over.
In post the main advantage is control over your Virtual Set. You can
use a wider array of tools available in the various compositing and
nonlinear editors to Chroma Key, color correct, and even pan and zoom
on the composited Virtual Set.
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