Re: Lanczos interpolation

In rec.photo.digital Guido Vollbeding <[EMAIL PROTECTED]> wrote:

> If you have JPEG (DCT) data, you can directly use the IDCT for
> efficient interpolation:

Ah, that's very cool.  But JPEG tiles don't overlap, do they?  So when
using this trick for enlarging wouldn't you end up with
discontinuities at the edges of the tiles?

Andrew.