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Here are some common questions that are asked about
virtual sets and virtual set production:
Q) What is a virtual set?
A) A virtual set is any replacement for a real physical set, generally
computer generated in nature, which uses the process of chromakeying
(removing a chrominant color) to place a synthetic background behind
the keyed talent.
Q) Can I key on DV?
A) This really has two answers 1) No, DV is an awful format to key
on since it is 4:1:1, that means it throws away half the color information
making keys blocky and unrealistic. 2) Yes, it is possible to key
on DV, but the only way you will get a decent key is by using Ultimatte's
AdvantEdge.
Q) What is the best video format to key on?
A) From least to best: Composite and DV are the worst to key on
because they introduce artifacts into the key. Svideo is lowest
good quality key, a decent key can be gotten from an svideo signal
because it separates the luminance and chrominance into two channels.
Between SDI and Component opinion has it that Component gives a
better chromakey than SDI, the reasoning behind this goes something
like the difference between a record and a CD, the digital version
only has so many bits of definition, whereas the analog version
has infinite definition. That said you would be hard pressed to
tell the difference visually between a Component and an SDI key
and with SDI's ability to route through multiple peices of equipment
with no loss SDI is fast becoming the choice to key on.
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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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