>> This minor update does two.five things:
>>
>> o Implement Keys' 4th-order cubic kernel --- as 'cubicK4' ---
>> as suggested by Nicholas Boos.
>>
>> o Make 'cubicK4' the default kernel.
>
> Oh, so the default is cubicK4 rather than sinc:6 (which I believe
> was mentioned as the default in 8.0) now?
Yes --- although due to programmer blotz (noticed by Nicholas), 8.0 was
still using 'linear' as the actual default.
> One major use I make of y4mscaler is downscaling HD (1920x1080) for
> 16:9 704x480 DVD. For that which of sinc:6 or cubicK4 is supposed
> to be better? Or is the difference not likely to be noticeable?
Well, to be honest, I have very little idea.
If you have a lot of sharp edges (i.e. stuff that likes to ring), you'll
probably notice a difference.
I just put a bunch of 'worst-case' sample test cases up on the site:
http://www.mir.com/DMG/Software/step-rings-table.html
Alas, there is no perfect filter,
-matt m.
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