Resampling

Upsampling

Or supersampling, upscaling. It is important to know which resamplers work best for upsampling and to be able to tell (to some extent) what sort of resizing kernel was used on a source in order to reverse bad upscales.

https://diff.pics/AOJ4sBhbe6SX/1 - 2x magnified luma test image using various kernels (and nnedi3)

  • 3 - B-Spline - Bicubic b=1, c=0
  • 4 - Hermite - Bicubic b=0, c=0
  • 5 - Mitchell-Netravali - Bicubic b=1/3, c=1/3
  • 6 - Catmull-Rom - Bicubic b=0, c=0.5
  • 7 - Sharp Bicubic - Bicubic b=0, c=1

Downsampling

TODO

Inverse scaling

TODO

put something about (1-b)/2 for bicubic and b=0, c=X can be any number of values

Chroma Subsampling

TODO

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