Alright, I've had this problem for a while now.
Every time I want to use levels or brightness & contrast adjustments, the pop up comes up, I adjust the sliders, there is a preview, but it always reverts back to the same when I press OK. It worked once, I don't know I how I did it thou. I've read that it worked for many people with the image at 100% (Ctrl+0 or Cmd+0), but it doesn't work for me. I am editing a black and white scan of a drawing.
Help.
