Digital BW, The Print

Some time ago I have been complaining about "ugly vertical stripes" 
with a StudioPrint demo version and an Epson 7600. Meanwhile I could 
isolate the problem: it seems that it only occurs in one of 
the "variable" dot modes of StudioPrint. 

To be sure that it is not my new 7600 printer: could someone please 
print a cmyk wedge (each channel continually varies from 0% to 100%) 
without any profile attached and see if the tonal variations are 
really smooth and monotonously increasing ? Print environment 
settings: dot size = "variable1" or "variable2"; resolution =1440x720 
dpi, dithering = "stochastic" or "error diffusion" or "smart 
diffusion".

It would be great if you could help me with doing this test (I can 
send you the cmyk wedge test file, please contact me off-line).

Many thanks in advance,
Peter

peter baumbach - fine art photography
http://www.pb-photo.com