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I see this thread posted on /a/ from time to time re: Jinc. I'm going to post copypasta from an email from Madshi on this:
>It may be true for odd aspect ratios, but if it's clipped than only the most borderline pixels (those with the smallest weight to the final pixel result) should be clipped, not the more important ones. Those clipped pixels will be very very far from the pixel center and have weights near zero, anyway, so although it's not nice (and probably I should fix it), the effect on the final image quality should be next to invisible with real life content. And for exact 2.0x or 4.0x upscaling ratios there should be no clipping at all, I believe. Because of these reasons, although it's on my to do list to look at, it doesn't have a very high priority at the moment.
>The "oversharpening" is actually a (de-)"blur" factor recommended to me personally by the "inventor" of Jinc (Nicolas Robidoux).
>BTW, have you tried super-xbr with the latest madVR build? It looks better to me than Jinc, and is slightly faster at the same time. Can only do exact 2.0x upscales, though, while Jinc can scale with any factor.