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Posted by Rayne on 10/10/06 06:36
yep thats the kind of thing, but im going one step further...i want to
do 3d rotations...any ideas? As simple as creating a sprite with a
still and rotating it? Or is there some special technigque?
..
PTravel wrote:
> "Rayne" <mineapollo@gmail.com> wrote in message
> news:1160399746.466405.211350@b28g2000cwb.googlegroups.com...
> > Hi guys, ive been struggling trying to understand something here. Has
> > anyone seen (hard to describe) adverts and title sequences made using
> > stills. Pics of people or things that have been cutout and rotated
> > about the z-axis? Channel 4 used to make a whole lot of these adverts
> > at one point using this kind of technique...im trying to work out how
> > to do that kind of thing, either to use after effects or Motion to
> > create movement using stills. Help? I know its a bit tough to
> > describe..ill try and find an example and post back..
> >
>
> I think I know what you mean.
>
> The first step is to separate the subject from the background. This is done
> using a still image editor, like Photoshop. Start with two copies of the
> original still. On one, use "magic lasso," "background remover" or some
> similar tool to isolate the primary subject. Save the still in some format
> that preserves the alpha channel.
>
> On the other copy, use the "Healing brush" or "clone tool" to extrapolate
> the missing background that was behind the primary subject.
>
> Import both stills into a video editor or effects program that can work with
> alpha channel and allows superimposition. Place the still with the primary
> subject over the still with the extrapolated background.
>
> Using movement tools, setup a slow zoom or pan on the still with the
> background. Do the same thing with the primary subject still, but increase
> the speed and "distance" moved (this is an old animation technique
> originated when cartoons were drawn on cels -- there's a name for it, but I
> can't recall at the moment).
>
> The resulting video makes the scene appear as if it was three dimensional,
> with the primary subject positioned in front of the background.
>
> Because the "hole" left in the background still when the primary subject is
> removed must be filled in, there is no way to create the entire effect in a
> video editor or effects program (at least none that I'm aware of). Also, if
> you don't have anything that works with alpha channel, you might consider
> positioning the primary subject on a green or white background and using
> chroma- or luminance-keying in the video editor, respectively.
>
>
> >
> > M
> >
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