Digital BW, The Print

David-

It gets more complex than that.  The glass adds others factors too. I 
won't get into that physics.

If I know where the print will go, I'll print for that lighting. 
However, I don't think any place outside of a gallery or museum has a 
constant light source (deg-K, etc.).  One of my viewing sources is an 
overhead light with tungsten, A Reveal bulb and a warm flourescent on at 
the same time.

The highlight/shadow behind glass is something else you would print 
for--if you know.  But what glass?  The matte print will still diffract 
and refract before bouncing the light back out.  That may cause some of 
the appearance of better "blacks."

Behind glass or not; multiple lighting or not -- I still prefer the 
"richness" of a matte print over the "brilliance" of gloss.

But, that's a battle that will never end.  One thing I would LOVE to see 
is an original Ansel Adams, Minor White, etc. print both out of glass 
and behind it at the same time.

Seth