Digital BW, The Print

> Be carefull with the Smarter Sharpen X V2.0 plugin : I have asked 
> them if it works with grayscale files : the answer is NO (you must 
> convert your file in RGB).

True. I find that annoying sometimes. However, I usually end up with
my files in RGB anyway, so personally it's not a big deal. If you want
to stay in grayscale you should avoid this plugin.

You can also try this one:
http://www.powerretouche.com/SharpnessUserguide.htm

It should do 16bit grayscale. I haven't used it personally so I don't
know if it's any good.