It’s not uncommon for VapourSynth users and developers to require multiple scaling or format conversion libraries in order to have access to every common convolution or formats. kernels help solve this age-old problem by uniting multiple of these libraries under a single interface. This allows for developers to support many libraries at once without having to worry about implementing all of them themselves; vs-kernels handles that for you.
Kernels are fairly extensive. For example, say you want to downscale a video clip to 1280x720 using bicubic. You can call it directly like so:
kernels.Bicubic().scale(clip, width=1280, height=720)
But what if you want to use specific parameters? Say you want to use b=0, c=1, commonly known as Sharp Bicubic. Changing the Bicubic settings can easily be done through the Kernel object’s parameters.
kernels.Bicubic(b=0, c=1).scale(clip, width=1280, height=720)
Or you can use the preset,
to quickly call the exact common variant of Bicubic you want.
kernels.BicubicSharp().scale(clip, width=1280, height=720)
This allows for easy customizability, and every kernel can be given unique parameters if required.
kernels.Bicubic(b=0.2, c=0.4) kernels.Lanczos(taps=3) kernels.Impulse(impulse, oversample=8, taps=1)
Using this interface allows for consistency, which makes supporting a wide array of kernels in your own function very simple.