Digital BW, The Print

I'm sorry I got on to this thread late because I have run into the 
described problem myself.

I run a digital imaging studio and print for a lot of different 
photographers so I see more varied
files than most.

I have tested several of the popular inks and workflows, currently using 
the MIS FS and the cone driver.

The "posterizing" and sometimes "edge breaks" are most evident in 
portraits and nudes but do
occur in other types of images.

My experience leads me to believe one of the basic problems with gray 
ink printing is that at the
precise tonallity where the different gray inks "cross over"undesireable 
things can happen.

The choice of papers does affect how this effect occurs, because of how 
each paper responds to different coverage.

I have had some sucess curing this problem by mismatching profiles and 
their papers.

Otherwise I alter the local contrast of the file where the tonal problem 
is manifested.

If one has not seen this ocuring, they are either extremely lucky or 
they are simply not viewing
their prints objectively enough.

Broken up histograms have almost no bearing on this "posterization" that 
I'm specifically referencing.

J.Z.