Ah, yes, there can be weird circumstances where negative values can be achieved, especially with Average, but also with very unfortunate levels. Eventually I will deal with this altogether AGAIN, because I have fixed this from happening in a number of places. Apparently not all of them, yet. Puzzles me sometimes.
...but I shall conquer the matter!
Thanks, Zero!
Capp, yeah, in theory it could be kept open, which is something photoshop can only dream of and twice the reason for me to enable it, hahaha, but I can't make a real time histogram, because that would just end up being too slow.
For now I would frolic in the fact that you can real time select tint/replace from where ever you like, while the GUI is open. Additionally one should keep in mind that it is not a retouch program, which puts a little less weight on this side of things, but I know how vital it can be- or rather how beautiful- to have it! That's why it's there now!
Thanks for the feedback, though! I'll ponder over it for sure!