On Wed, 9 Sep 1998 03:55:10 GMT, phr@netcom.com (Paul Rubin) wrote:

>It seems to me that knowing the focal length of a fisheye lens,
>a little bit of image mapping should be able to straighten a
>region of a fisheye picture so that the lines and angles are
>normal again. Of course the resolution would be worse around
>the edges, since the pixels would have to be stretched there.
>The fisheye attachment for the Coolpix 900 then becomes a cheap
>way to get a rectilinear ultrawide, instead of a very specialized
>or novelty gadget. The same could be done with scanned negatives
>from film cameras with fisheye lenses, of course.
>
>Does anyone know if there are already Photoshop or GIMP macros
>that do this?

See following posts for more on that - but as to "so that
the lines and angles are normal again", you may want to
peruse my article, "On Seeing and Perspective" (on my web
page, under "I babble") before deciding that a fisheye
view is "not normal"... (it actually is the way we see...;-).