Hi @jarvie I actually use a program called Maxim DL to do this processing. But generally you won't get this sort of functionality until you get to Photoshop. You can definitely, do this type of work with Gimp, in fact the latest version 2.10 finally has good support for 16bit images. In Adobe Photoshop (or Gimp) the easiest way to get this result is using the histogram equalisation function.
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Pretty awesome ... I'll have to find some sort of Youtube video of someone doing it live. Mostly i'm just intrigued that you're able to pull that much out of the black area and that you have it pinpointed down to such a range where most of that info is living.
Yes reading the histogram is a good starting point. Many astronomical software packages work differently in that they are designed to image stretch around the histogram peak.