Inspired by recent posts by James and (Alaska) Dan about sharpening without increasing noise, I tried the following with this image of a cactus that I took in California a few days ago. The steps were:
Tonality adjustments and B&W conversion in LR.
Move to Photoshop. Create a high-pass layer. pick a large radius for some dramatic sharpening of the edges. Apply nose reduction to the high-pass layer. Blend with the hard light mode. Move back to LR. Do a bit of general noise reduction to smooth out grain on the flat surfaces.
C&C welcome, of course--about both the processing and the image.