Digital BW, The Print

>
> - do folks use prophotoRGB colorspace in general?
> - If so, how do you think about/manage output to lower res devices?
> - If it creates more headaches than not, is it even worth considering
> for bw desktop output?
My understanding is that there's a trade-off with larger color spaces: 
namely, the large the space, the more colors it can represent; but the 
larger the steps are between colors when the space is represented by a 
limited number of samples (bit depth). So, if you use a space which is 
considerable larger than your output device, you won't see a benefit 
from the parts of the color space that the output device can't produce, 
and you might lose subtle transitions of colors due to the large spaces 
between colors in the file in the larger space.  The benefits of a 
larger space are that as output devices get better, they'll be able to 
produce a larger gamut of color.  Whether there's any gain or trade off 
in practice will depend on a lot of things. It should be too hard to 
test this with your system.  If you're working with raw files from a 
digital camera, convert the raw file to two different files, each with a 
different color space. Then do your photoshop stuff on both of them. 
Print with preview using a color profile for your output device, and see 
what, if any, differences there are.