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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).
Ultimatte's AdvantEdge
is one of the premier chromakeying plug ins, more information is collected
below. You can also buy AdvantEdge
online. 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 Green or Blue 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 Blue Screen, but more and more often field correspondents
and even newscasters are Blue Screened.
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A Virtual Set uses Blue 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 Blue 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 Blue Screener
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 Blue
Screened 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 Blue Screen, color correct, and even pan and
zoom on the composited Virtual Set.
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