Hey Marco, could you tell whether and why using bicubic for enlarging and bilinear for reducing is better than using bicubic for both? I was under the impression that bicubic was the highest quality algorithm for all resizing operations.
No, I couldn't. I cannot find any reason based on a clear mathematical proof.
However I'm quite sure that bicubic is not a panacea for all resizing operations. In
is given an example of better results with "Nearest Neighbour" instead of bicubic (because of the image nature).
is described this bilinear/bicubic option of PSP.
The question is tricky. And I'm very interested in a clear answer. My opinion is that (sometimes) bicubic for reducing smooths the image too much.
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