Scale down filters

[Micio2]

Hi all, my 1st post here, hope not faq

I'm just used to do always BilinearResize when scaling down, because I feel that is the option who gives me the better result, confronted to bicubic or lanczos, when image has to be smaller than the original.

I'd like just to know if someone got better results with other filters, and in which contest they performed well.

I mean, if frames with lots of sharp lines will be scaled better with 'X' filter, or 'Y' filter is great with 'cloudy' frames, I may want to use them when scaling that kind of frames, and bilinear the others.
That surely ends up with hellscripting, but I'd like hurting myself, can't be helped.
Thank you

[Zarxrax]

Generally the resizer you use doesn't make a huge difference, in fact I would say it's probably not even noticeable to 99% of people. Bilinear is generally one of the blurriest of all the resizers, and most people generally go with a sharper one because "sharp" tends to look nicer. Spline36 or Lanczos are the ones I usually use, whether its for going up or going down.

[mirkosp]

Generally the resizer you use doesn't make a huge difference, in fact I would say it's probably not even noticeable to 99% of people.

Go Alan, use PointResize!

[EvaFan]

I use bilinear for everything but in general you would use a smoothing resizer if your going to downscale.

[Mister Hatt]

Bilinear blurs things more than necessary. Lanczos has terrible artifacting. The only resizers that should ever be used are spline36 and bicubic, and if you know the math behind it and have a good reason, sincresize. Bicubic is generally used when your source is bad and could do with a good blurring and then some sharpening afterwards. Spline36 is the all purpose resizer. Spline16/64 are broken and should not be used. Spline filters are effectively lanczos with higher taps, and therefor more sharpness, without the artifacts and ringing. For upscaling, planar interpolation is the best method but should only be used if your source is already RGB, and it's slow.