Object masks in Photoshop ???

[kirkster501]

Hi all,

If I have a complex nebula structure, how do I create a Black and white mask out of it please to use to mask areas for further processing?  In PixInsight you'd extract luminance and do an histogram transformation of it, job done.  How to do the same in Photoshop please?

Thanks, Steve

EDIT:  I worked it out.  Thanks for looking anyway.

Edited January 22, 2020 by kirkster501

[Laurin Dave]

I've also used the Range mask in PI at various settings and then blended them together / erased bits I don't want (bloated stars for instance) in PS to form a bespoke mask …  also Starnet produces excellent star masks which again are easy to add to it in PS