What is a good downscale algorithm to choose?

[Danne S]

Hi all,
What's a good downscale algorithm to choose when quality is in mind?
I have heard that CR is the way to go but shouldn't Lancos 3 be even better than CR?

Skickat från min GT-N7000 via Tapatalk

[huhn]

the best in scaling is that that looks best to you nothing else.
based on ssim, psnr or things like that it should be spline

[raffriff42]

If we are talking 50% reduction or smaller and very sharp sources, bilinear will be smoother, and to me, better.

For preserving specular highlights, gamma aware resizing (http://forum.doom9.org/showthread.php?t=160038) looks interesting.

[Asmodian]

I strongly prefer gamma aware resizing when downscaling. I use dither tools in Avisynth.

I like CR AR+LL in madVR but that does seem to exaggerate artifacts caused by using NNEDI3 doubling for luma and something else for chroma (Jinc 3 in my case). I would use 3 tap spline if I wasn't using AR+LL but I always use LL.

[LigH]

Kernel visualization of interpolations available in ResampleHQ (http://svn.int64.org/viewvc/int64/resamplehq/doc/kernels.html)

What is CR ... Catmull-Rom?

[huhn]

the question was first asked in MadVR thread and now moved here.
so this is not about resizer in general is more about resizer in MadVR.

and yeah we like to use CR LL AR for catmull-rom linear light anti ringing.
and most user recommend it as the "best" for downscaling.