I made a video about astrophotography processing. I also modified a couple of Roger Clark's scripts to work better on windows. I might re-write them in python at some point in the future, not sure.
Here's the video: https://youtu.be/zWZoTfAymVE
rnc-color-stretch (download the GUI version): http://www.clarkvision.com/articles/astrophotography.software/rnc-color-stretch/