I knew it had to be some type of HDR application. I have experimented with it a little and have mixed feelings about the results. Your photograph has a completely unique tone to it, almost like some kind of graphic print. I think it turned out pretty cool. How many photos did you combine? Certainly not 30!
Yep, 30! I needed to get the print in the stained glass and it wasn't turning out the way I needed it to, so the more super dark exposures I added into the HDR merge the better it turned out. It was my first time playing with HDR in black and white actually, and I just kept playing with things until I got what I liked