Oh hey, if all you're needing is a 100x100 res. animation that's no problem.
You can use orthographic in the camera and specify the width and height with
keywords right 100*x up 100*y then translate the camera accordingly.  The
original image would be placed in as a image_map on a plane with that camera
looking at it.

#declare WhereX=50+(clock*490); // depends on how you are animating
#declare WhereY=50+(clock*330); // starts at lower left border

camera {orthographic
 location -z*100 look_at 0
 right 100*x up 100*y // actual unit area size seen
 translate <WhereX,WhereY,0> // where to look (centered)
}

plane {z,0 pigment {
 image_map {bmp Original.bmp once}
   scale <640,480,1> } // get to unit/pixel res. equivelence
 finish {ambient 1}
}

So, main thing would be to constrain your Where values to stay within the
borders of the original image, and to move the look_at point however you had
planned.
Hopefully I wrote this correctly.

Bob H.

"Kirk Hubbell" <kir### [at] yahoocom> wrote in message
news:3aaabacc@news.povray.org...
> My default method, which I have done on a smaller scale (50 frames), is to
> render the series of images at 640 by 480 and then using PhotoEditor cut
the
> 100 by 100 out manually frame by frame (being careful to pick the same
> pixels) and then turn the new 100 by 100 series into a video. Since this
> particular segment will be 100s of frames I was hoping to find an easier
> way.
>
> Kirk H.
>
> "Bob H." <omn### [at] msncom> wrote in message
> news:3aaab862$1@news.povray.org...
> > "Kirk Hubbell" <kir### [at] yahoocom> wrote in message
> > news:3aaaadbc@news.povray.org...
> > > I am trying to create an animation of say 100 by 100 pixels that I can
> > > overlay on a 640 by 480 picture.
> >
> > You'll need the whole 640x480 area in order to overlay to another
640x480
> > but just move the 100x100 section around within it.
> > Alpha channel or image_map is two possibilities, however like I said you
> > can't render a useable segment of a larger image due to how the image
file
> > is done.
> > You can of course render the section over top of the larger and output
as
> > whole 640x480 image(s), but not what you want to do I guess.
> >
> > Bob H.
> >
> >
> >
>
>

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