Do resizers prefer fractions?

[mitsubishi]

I was just wondering if you get better results by resizing to fractions rather than arbitary values. I tend to just use Lanczos and fall back to bicubic if it's making the output too big, but I've been trying to keep an eye on these discussions about spline.

Right my thought was, if going from 1080 (anamorphic) to 720 and there are is a say 2 pixel black border around the edge it might be better to just leave it. Since 1280/720 is 1.5 and 1440/1280 is 1 1/8.

Is this wrong and I should just crop the pixels?

[foxyshadis]

1/x fractions are the only way to make point resize look good. It might have some kind of effect on bilinear, it's something I've never really thought about. But all the other resize algorithms juggle the numbers in ways that work the same way no matter what ratio you resample to.

[mitsubishi]

Ah so it doesn't follow that it's better for the pixels to fall into groups. (ie 1080 to 720 gives turns every 9 horizontal pixels into 8 and every 3 vertical pixels to 2)

Well I'll go back to cropping again then, cheers.