I have to say that I am not convinced this is a solution.
Unless I have misunderstood, you seem to be simply trying to cover up the noise (“chatter”) by crushing the key and then applying prodigious amounts of blur.
Have you had good results with this method? Does the resulting key look completely clean?
I would have thought all you are doing is spreading the noise out over a larger area and not removing it.
It’s not really possible to remove temporal noise (which is what you are calling “chatter”) by means of a spatial blurring method. Temporal noise needs to be addressed with temporal noise reduction – probably the best reason to splash out on the Studio version of Resolve.
In addition, I tend to think that very blurred keys look pretty unconvincing as a general rule, not to mention that crushing the key results in removing the detail of the grey values which you would normally want to strive to keep.
But as I say, I may have misunderstood you. I’d be interested to hear more.
Simon Ubsdell
tokyo productions
hawaiki