Thanks for that suggestion. I should have explained though that I'm not trying to animate or add sparkles the image. I'm using the older version of the radial filter to make individual star images smoother and more circular (rather than current egg-shaped). Applying the filter to a small circular selection around a single star works well, but it's not practical to repeat the process very many times to apply it to every star. Although Noel's filter doesn't do quite what I want, it does address the problem of applying the filter across multiple centres .... so there is hope!
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