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Pete,
Start by creating a preview that encloses the star/halo. It's easiest to make sure the preview is centred on the star - there's a little cross displayed at the centre of the preview as you drag it out.
Invoke the StarHaloReducer script. If you move the RGB/K slider way to the right and wait a little while you should see a noticeable effect on the preview displayed by the script. There is a status display to the left of the Cancel and OK buttons which will tell you when the script is computing and when it is finished.
Now try increasing the Star halo radius and Halo reduction radius and wait until you see the effect on the preview.
That should be enough for you to get a feel for how it works. Tweak settings until you're happy. Press the OK button and you'll get a new image with the halo reduction applied to it.
Cheers,
Rick.
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