I set white balance and everything like that in camera from some test frames, so I don't really do all that much PP on images they normally go straight from the camera to the stacking software, then once out of the stacking software, I'll then treat the stacked image like any other photo and apply any sharpening and clone out things like planes and other objects I hope that helps
Matt
MWHCVT
Yeah cheers ive now got everything i need to go out and shoot star trails just need a clear night
Living close to gatwick i think im pretty certain to have a few stray planes in my shoot