Digital BW, The Print

I've found that the original C-6 formula has a problem with the gray 
substitution in the 2400, and presumeably other K3 printers.  To avoid 
posterization with the Epson driver in the deep shadows, a modified 
formula is needed.  C = 30% Eboni and LK = 18% Eboni does the trick.  
The other positions are unchanged.  

By the way, one obviously cannot have 2 inks of the same density in QTR 
as "gray" inks and expect the semi-automatic paritioning algorithm to 
deal with it.  I've found, however, with printers that have large 
numbers of inks that one is better off with multiple partitioning 
sequences.  That is, rather than have 8 gray inks, set up 2 separate 
profiles of different combinations of them (or, I suppose, having some 
called a "Toner" would work).  In an initial test on my 2200, I made 2 
profiles with 4 inks each (including the black in both).  I then 
printed with both profiles at 50%, and it resulted in a smoother print 
than a single 7-gray-ink profile.

Paul
www.PaulRoark.com