Hi Roger,
I think it is neatly impossible to stretch an image without some form of star protection, usually a mask, or even a star removal process. Recently I have started to use the Histogram Transformation tool in Pixinsight - stretching only enough to not bloat the stars. I don't stretch until I like how the object of interest looks! I then make a star mask in order to continue the stretch still reserving plenty of room for later tweaks. Bottom line I think one must treat the stars as one photo and the object of interest as another.
Peter
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