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Old 14th April 2012, 02:33   #2  |  Link
Asmodian
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Join Date: Feb 2002
Location: San Jose, California
Posts: 4,406
Just a friendly note:
Don't ask what is best (check out the fourm rules)

To use nnedi3 to upscale you use nnedi3_rpow2().

The first example from the help file for nnedi3:

Quote:
enlarge image by 4x, don't correct for center shift.

nnedi3_rpow2(rfactor=4)
I prefer a less ringing resize compaired to lanczos4, lanczos4 also requires more bits to encode. I like spline36 for most of my down scale resizes. Doing a large upscale I would use nnedi3 followed by spline36 to downscale again to the desired resolution, if I had the time.

I like this set of kernel visualizations from PhrostByte's ResampleHQ's documentation to understand the tradeoffs between resizers.
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