I want to invert the brightness in a RAW. I do not want to invert the colors, only the brightness of the colors. Can I do that in darktable 1.4.2, and if yes how?
Edit: By inverting brightness, I mean as described here: http://www.lostinneurons.com/2011/03/inverting-image-brightness.html
I think I understand the idea but don't know if/how I can do this in darktable.