Settings in Nik Silver Efex Pro for this black and white architectural photography picture of a Chateau in Bordeaux, France
The preset I chose for this pictutre of a French Chateau was the "Full dynamic harsh" preset with the following tweaks.
Dynamic brightness 13%
control point on the gravel structure 70%
Dynamic brightness 30%
Then unusually for me I added Blue toner no 8. I had not really noticed these before!
And finally a vignette using lens fall off 2. Which I changed to 1 as 2 was too much
All done and saved. Time 3 minutes.
Here is the initial edit
And finally here is the RAW file
Yes this was taken using a fisheye lens, the Canon 8-15mm lens on my Canon 6D. At the 15mm end of course!