Øyvind Kolås wrote:

The problem with using bilinear/bicubic/lanczos for decimation is
(apart from being
wrong in the first place) is that you end up throwing away pixels. For
bicubic a destination pixels uses information from a 4x4 source window
in the original image.
This is wrong. If you for instance scale to 10% of the original image
size. You need to include data from at least a 10x10px window.

Thank you.

So I repeat, why is the Lanczos Sinc filter (or bilinear or cubic for that matter) being used at all when reducing images?

All the best,
Alastair M. Robinson

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