[Gimp-user] selection by value threshold

Gimp 2.9 loads by 16-bit astrophotography files either TIF or FITS just

I've never had to to this with gimp yet, but I need to make a selection by
value threshold (I want to "cut out" stars that are hitting saturation in
my image with values of 64k)...I can't quite seem to figure out how to do
it.  Does anyone have any advice?

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