Quote:
Originally Posted by waldnebel
I came across something strange while letting madVR upscale a cute little 240p movie to 4k resolution. Please have a look at the following output:
luma -> NGU Sharp (very high) 4x -> Jinc AR
As I understand it the NGU sharp algorithm is applied 4 times and on the third round my little 240p movie should have a height above 2160 pixels. At this point downscaling is quite an interesting part. Why in the name of this planet is Jinc afterwards applied and no downscaling? I think I'm a little bit too stupid to get it.
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Here direct quadrupling: 240p x 4 = 960p. Jinc used for additional upscaling to target resolution.
Im not sure about ngu upscaling abilities after quadrupling step. Anyway quality is bad, because source resolution low and scaling factor big.