QTR-Quadtone RIP

I'll take a swing, but Roy and others may want to chime in if I'm 
off base.

First, adjusting the output midtone gamma and shadows ink limits (as 
you have done) is probably the best way to lighten or darken an 
existing linearized profile. 

Assumming you relinearized your profile after adjusting the 
graytones gamma or highlights/shadows values, QTR theoretically 
should internally create and apply an adjustment curve that 
straightens out the measured curve (based on the linearization 
density or L data you input) shown in the Curve Creator|Create 
Curve|Linearization plot between your measured dMax and dMin. 
Therefore you shouldn't see much if any variation.  In my 
experience, tweaking with the graytone values only helps the 
linearization process along. 

--- In QuadtoneRIP@yahoogroups.com, "stasunas" <Astasunas@...> wrote:
>
> I am trying to match the output of two printers, an Epson 2200 
with UT7 
> inks and an Epson 7600 with UC inks. Because of the diffferent 
inks 
> matching exactly may not be achievable, but ball park is desired. 
I 
> have printed out 21 steps for each and measured them with my 
PrintFIX 
> Pro spectro and for the 2200 is lighter through most of the range. 
I 
> then tried adjusting the Gamma (1.1, 1.25, 1.5) and Gray curve 
shadows 
> and highlights(from 6 to 10) for the 7600 curve in Curve Creation, 
but 
> the output by eye did not change enough to measure. But when I 
changed 
> the Shadow and Midtone values (-20, -6), the steps lightened and 
> approached the densities of the 2200.
> My question is, why am I not getting changes by adjusting the 
Gamma or 
> the Shadows & Highlight in the Curve Creation? Are my adjustments 
too 
> small, or is something else going on?
>