Re: Lanczos interpolation

Mark Herring <[EMAIL PROTECTED]> writes:

>>You don't do panoramas then?

>Yes, I do.  What's that got to do with interpolation?

Making panorama images line up along the seams absolutely requires some
amount of resampling of the images being matched.  Even if the camera
was absolutely level for both shots, so no rotation is needed, you have
two (or more) images projected onto two separate flat image planes that
are not in the same plane.  To produce a merged output image, you need
to reproject the contents onto either a cylinder or a larger flat plane,
to get rid of keystoning distortion in one or two directions.

And *that* requires resampling the image, which is an interpolation
process.  You can't rotate, or warp, or resize an image without
interpolation (unless you're willing to put up with the horrible-looking
artifacts of nearest-neighbor sampling).

        Dave