I wasn't totally satisfied with the results I was getting.
invks allows reversing the kernel to get back the original picture? Great!
I might have to experiment with the various kernels and compare the image quality after converting back and forth.
Dither_resize16nr(Width(),Height()/2,csp="YV24", kernel="spline36")
[process in YV24]
Dither_resize16nr(Width(),Height()/2,csp="YV12", kernel="spline36", invks=true)
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