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Posted by Richard Crowley on 01/12/06 14:20
"Wondering_1" wrote ...
> Can anyone tell me which software does the following:
>
> 1. Still image, appearing in 3-D, as the foreground moves
> at a different speed than the background when panning, of
> the foreground zooms in as the background remains still.
> Somehow, the foreground has been lifted from the image,
> slightly magnified to cover the original, then animated...
> I think it's soo cool, but haven't been able to find out how.
I've seen it done two ways...
a) Zoom the camera lens while moving the camera so that
the background remains "constant" while the foreground
object grows larger. This is tricky to get just right and
there is a name for it which excapes me. ("regrograde zoom"
or something?)
b) I've seen some archival photos (old black & white stills
from some news archive) where they used Photoshop, etc.
to cut out the foreground image, and impose it onto a
separate background. By moving the foreground and back-
ground at different rates, you get a 3D effect. The tricky
part of this is to get a continuous background image
because of course it is missing in the original where the
foreground object occludes it. Sometimes it may be
"recreated" by an artist, or maybe they select a similar
whole image and substitute it for the original background(?)
> 2. Video images where everything is black and white
> except some roses that are red...how is the color turned
> off selectively?
The trick here is the either incredibly tedious handtracing
of each frame (to separate the color part from the mono-
chrome part), or some very specialized (and expensive)
software which automatically tracks the selected objects.
What you need is called a "traveling matte" which is
used to mask the color or monochrome part of the picture.
It is a simple "silhouette" of the color object, but a different
one *for each frame of video/film*.
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