There is a Russell Croman web-page for GradientXterminator and NoiseXterminator, etc and on it there is professional-grade astrophotography examples
one link for: galaxies and one for nebulae...
This is a link for the Andromeda Collaboration (it used a ground-based 8.2 meter scope, a 4 meter scope for H-alpha data and data from the Hubble HST
apparently there is a way a person can 'mask' to prevent the blowing-out of the core's 'swirl' of detail...that is self-evident in this photo (you can zoom-in a lot) and even
see the PGC 90494 too. Looking clearly defined and 'razor-thin'
There is other good-deep-sky on that web-page too. So please check it all out!