07 Contrast Brush
I think some parts of the image need more contrast, too, so I’m swapping to the Contrast Brush (directly below the Brightness Brush), making sure the Mode is set to More Contrast. The effect can be relatively subtle, so I’ve pushed the Amount slider on the options bar up to a value of 75.
08 Increasing the contrast
Now I just paint over the areas which I think need a little more contrast – again, I’m not using the Perfect Brush option because I want to blend in the effect subtly.
09 The finished image
I’m really pleased with this, but I do have a confession to make. I launched Perfect B&W from within Aperture, and then applied a levels adjustment in Aperture afterwards to brighten up the finished image. I could probably have done this in Perfect B&W, but didn’t notice it needed it at the time.