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Hi Ben, I do the following all in PI....
1) using PI only create a starless image with StarNet then use pixel maths to get an image of the stars, i.e. stars = original - starless
2) work on the starless image to bring out the background/nebulosity etc.
3) to add stars back into image use pixel maths i.e. new image = processed starless image + stars saved from 1)
Of course you can also reduce the star sizes before adding back to the processed starless image
As Andy commented it is a pain on a Mac but there is a process module for the windooze version of PI
Hope this helps
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