I dug out some older M33 data to play with on a rainy evening. I let the ha lights I also have shot alone and only used the L, R, G and B frames. Together they sum up to only about 2 hours of light but the data were fine. Used APP for the preprocessing and calibrating, PS for most of the rest and finally LR for some tweaks. In between I had a starless layer coming from starnet++ to have something to max-stretch for the faint outskirts of the galaxy. I had intended to keep the colors and overall impression temperate.
Camera was an ASI1600mmp attached to the TS Photoline 130/910 mm scope.
79 x 60s L
14 x 60s R
14 x 60s G
12 x 60s B
On Astrobin in full resolution: