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Posted by Richard Crowley on 07/05/06 14:06
"Mark in Philly" wrote ...
> When I watch a fireworks display on TV, I notice many productions
> include multiple angle shots superimposed to make it appear as there
> are more fireworks than actually are actually occurring at the time.
> Sometimes the second camera is delayed a little so as to mask the
> symmetry.
With modern DVE (digital video effects) switchers,
it is a matter of pushing a few buttons to delay the video
from any source.
> Surprisingly, most other viewers are incredulous when I
> point this out, even when I show that the symmetry proves it can't
> possibly be a single shot.
People are way too mesmerized by what they see on the
television screen. It is almost frightening at times.
> Can anyone provide information verifying they do this, and how it's
> done?
It is a very simple cross-dissolve where the video
from both cameras is combined together. Same effect
when you are watching a concert where you see a long
shot of the singer in half of the frame, and a close-up of
their face in the other half. Nothing magic. It is a very
common effect.
> I've seen some where the camera(s) is/are panning,
> which makes this process complicated unless the
> cameras are synchronized.
Unlikely that they are "synchronized". If you have
good camera operators, they have a "feel" for the
kinds of shots the director wants. And most pro
video production equipment is equipped so that
the camera operators can view the (combined)
program video in their viewfinders rather than the
video from their camera. By viewing the same
combined program video as you are seeing at
home, they can frame harmonious images from
their camera to blend into the whole effect.
> Sometimes there is a single
> background. If it's a multi-shot, then how is the
> background 'subtracted' from the picture?
Doesn't have to be "subtracted" Since most fireworks
shows are done at night (for the most obvious of reasons)
the background is a "jet black" sky (or "blanking" in
video terms). The video from the two (or more) cameras
is merely added together by a trivial process.
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