Avisynth upscaler sharper than Sinc 4: yes, there's it!

[luquinhas0021]

As I'm passioned for testing upscaling algorithms, I went play around with Bicubic parameters. Well, Bicubic b=0, c=1 aren't sharp like Sinc 4 (It's sharp equal Photoshop CC 2015 Bicubic Sharper). So, I've decided put b like -x, because negative values for "b" does the same of positive ones for "c". So, 'cause precise Bicubic has the form b + 2c, as c = 1, b = -1. This yields incredible sharp results, but has aliasing in some areas (I imagine Bicubic ever generates aliasing, but bigger is b, or smaller is c, more hidden it is). I suggest you try my Bicubic parameters and talk me what you think. Try b = -0.5 c = 0.75 and b = -0.6 and c = 0.8, and let's see if some of this two last configurations I wrote are sharp like b = -1 c = 1, but generates less or no aliasing.

[pandy]

As I'm passioned for testing upscaling algorithms

Sharpest known upscaler and mathematically perfect (lossless), no ringing is: rectangular window i.e. Nearest-neighbor (preferably even size).

[colours]

Dang, how the heck are you still at this?

Yes, of course it's sharper. It's also excessively sharp compared to the original. If all you want is a sharp output, you can use whatever scaling algorithm you want after sharpening the input however much you want.

(Edit: oops, didn't notice the date. I haven't been around in a while.)