Digital BW, The Print

Lou,
Thanks for the reply.  I believe before using printfix pro or
spectrophotomer to create icc for color managed workflow, curves were
used to smooth out transition of ink in a step wedge.  If you look at
some of the curves that were (are) available for MIS inks, the RGB
channel is a straight diagonal line, while the red, green blue
channels have odd shaped curves.  These curve channels control which
positions in the printer (K,C,LC,M,LM,Y,etc) lay down ink at which
point in the step wedge (or any picture for that matter) when applied.

I'm using the UT-3D inkset in my R220 to try and learn.  For starters,
I tried using printfix pro (spyderprint) to print out targets, read
and create profile.  The test print showed some abrupt changes.  When
I used the curves from Paul Roark, and embedded into profile using QTR
create tool, the transitions were much smoother.  So, I'm interested
in learning how to make/tweak these curves on my own for the various
papers I use.

Thanks for the link though.  I still intend to check it out further.