My observatory site is only 16km from Melbourne. Light pollution and gradients are a constant problem.
I have been learning how to use PixInsight concentrating on DBE or Dynamic Background Extraction.
The small images below are the before and after using DBE. You can see how bad the light pollution and gradients are in my sky.
Here is a large version of Rho O after using DBE. 14MB
http://d1355990.i49.quadrahosting.co...12/RHO_DBE.jpg
The image needs more data but the improvement is spectacular even for a beginner at using PI!
Bert