Underneath its simple front interface is a powerhouse of tools.
And in astrophotography, that tends to be a good thing!
Whatever detail lies outside the RoI, is simply forced to conform to the stretch that was designed for the RoI.
The two aspects - color and luminance - of your image are neatly separated thanks to StarTools' signal evolution Tracking engine.
You can convert everything you see to a format you find convenient. Give it a try!