Digital BW, The Print

>Hello all,

         We all know the general rules of thumb about minimum recommended 
resolution for printing to X size (whether that rule of thumb says 200, 
250, 300 dpi is irrelevant).  However, once you start getting into, say, 
36" wide prints and larger, it seems those numbers go out the window.  It's 
almost impossible to get, say, 250dpi across that large of a print.  But 
the assumption is that viewers wouldn't stand nearly as close to the print, 
so the sharpness still holds up.
         So...what exactly are the suggested minimums for such large 
prints?  At 36" wide, let's say, would 100dpi be enough?  75?  More?  Less?

         We're thinking of putting in an Epson 9600 here at the school I 
work for, and I'm trying to figure out a starting point for the various 
print tests I'll be doing.
thanks,
allan


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Technology Projects Manager
Academic Computing & The Office of Accessible Education
Stanford University
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f - 650-725-4685