QTR-Quadtone RIP

Not of lot of response ... 

Given that the 95% black value was much closer to 100 than to 90, I
decided that my problem was I had set the default and thus the black
ink limit too high.  So I set it to 50% and redid the ink separation
and linearisation.  The curve looks a lot better:

     http://www.ferdinand-paris.com/2400_less_bumpy_curve.gif

I can linearise and profile this fairly successfully.

In working with gloss I am discovering two things:

1.  The density of the 100% black patch on the ink separation print
with 50% (or whatever) ink calibration set is not as black as the 100%
patch on the 21x4 random test chart printed with a 50% ink limit.  The
test chart prints significantly darker, which I think was the source
of my problem.  Why is this?  It means that you really can't rely on
the ink separation prints to set the ink limit precisely.

2.  There's a lot of drying time needed.  The density measurements are
significantly higher on the separation print and the test charts (i.e.
more density) with an *extra* day's drying.  Patience is needed to
create these curves.

F_P