QTR-Quadtone RIP

Sorry, I should have specified this in my workflow. Yes, I first
generate the curve with the array empty. For each iteration, I clear
out the array, regenerate the curve, then populate the array and regen
the curve again. 
--- In QuadtoneRIP@yahoogroups.com, "Jeff Randall" <jrandall@...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "Philip Schwartz" <pschwart@> 
> wrote:
> >
> > My workflow:
> > - create ink profile in QTR
> > - select curve and print 21 step tablet
> > - measure steps after dry-down using X-Rite 810
> > - enter measured values into QTR linearization array and 
> regenerate curve
> > 
> > Problem:
> > Steps never achieve the ideal density for the measured dMax.
> > When I linearize using Photoshop transfer curves, I can get within
> > .01 for all steps, but I am often off by at least .05 - .10 in
> > multiple steps when I linearize using QTR. Multiple iterations 
> through
> > the process don't improve matters; things often get worse. 
> > 
> > Can anyone shed some light on this? I assume I should be entering
> > *measured* values into the linearization array, and not *derired*
> > values. Too bad QTR doesn't present the interpolated curve and let
> > users edit it directly ...
> 
> .
> .
> When you create the initial non-linear ink profile, the linerization 
> array should be empty.
> 
> When you do "multiple iterations through the process" do you clear 
> the linerization array each time?
>