I processed the stars and the nebulosity separately in PixInsight and Photoshop, mostly just bring up the light on the nebulosity without blowing out the stars with excess light.

This is M45, the Pleiades. About 7 1/2 hours of total exposure time in 300-second images. I took about 90 images and stacked them. Some are from last night, some from the night before, and some were a couple of weeks old.