QTR-Quadtone RIP

I've had this problem before when trying to use the Create ICC program when trying to 
create a proflle for an older printer that wasn't laying down the inks linearly.  However, 
there was truly a reversal rather than just the small differences that you point out.

My other question is about your method of linearization.  I have never used the Linearize 
Data exe file to linearize as you mention.  I read the densities through Gretag Measure tool  
and simply type in the densities in the Curve Creation tab.  Once you save the curve 
Linearization happens automatically.  I get the impression that you are taking Linearized 
data and throwing it in curve creation tab and then saving this file.  You could be 
linearizing twice.  Correct me if I didn't interpret you correctly.  

--- In QuadtoneRIP@yahoogroups.com, "Louis Dina" <lou@...> wrote:
>
> I think I figured out what I was doing wrong and wanted to share it 
> in case others are experiencing the same thing.  Not sure if it is 
> the best solution, but it seemed to work and give me a better profile.
> 
> I had my default ink limit set fairly high initially, where the curve 
> was getting very flat.  My Eye One showed very slight increases in 
> density at this point, but by eye it looked black a few steps 
> before.  The ink limit I chose loaded up the shadow areas with a lot 
> of ink, and while there was 'a little separation' between tones, it 
> wasn't much.  The 90, 95 and 100% tones were bunched up pretty 
> close.  So, I lowered the ink limit (in this case from 65 to 45, then 
> bumped the black boost up to about 70.  This changed the shape of the 
> black curve substantially and gave me a lot more separation between 
> shadow values (and a better Dmax).  The program accepted these values 
> without any error messages.
> 
> So, even though there was a slight separation between tones, I am 
> guessing the program has some default parameters for accepting or 
> rejecting linearization data, and my points were just too close 
> together to get a passing grade.  Just as well, since I am sure I 
> ended up with a better profile.
> 
> If this seems like a convoluted approach, please feel free to set me 
> straight.  
> 
> Thanks, Lou
> 
> --- In QuadtoneRIP@yahoogroups.com, "Louis Dina" <lou@> wrote:
> >
> > Thanks, Jim, but I don't think that is the problem.  I have other 
> > files that linearized just fine, and they list the L* data in 
> > descending order exactly as presented below.  
> > 
> > I did just upgrade to QTR 2.5.2.1, so maybe this is a bug?  It's 
> > probably something I am doing.  Perhaps the two or three darkest 
> > patches are too close together.  I did notice that the QTR-
> Linearize-
> > Data version is 2.5.2.0.
> > 
> > Lou 
> > 
> > --- In QuadtoneRIP@yahoogroups.com, "Jim Thyer" <jimth@> wrote:
> > >
> > > Hi Diana,
> > > 
> > > Remembering when I did my linearization the numbers were in 
> > ascending order, so try reversing them.
> > > 
> > > Jim Thyer
> > > 
> > >   ----- Original Message ----- 
> > >   From: Louis Dina 
> > >   To: QuadtoneRIP@yahoogroups.com 
> > >   Sent: Saturday, October 13, 2007 3:37 PM
> > >   Subject: [QuadtoneRIP] Invalid Linearize curve message
> > > 
> > > 
> > >   I am using QTR 2.5.2.1 on a Windows XP machine. I keep getting 
> an 
> > >   error message when trying to linearize that reads:
> > > 
> > >   "Invalid linearize curve -- not constantly increaseing. Curve 
> > >   Creation failed."
> > > 
> > >   I export data to a tab delimited text format and drag it onto 
> the 
> > QTR-
> > >   Linearize-Data.exe file and I get a nice smooth ramp without 
> any 
> > >   reversals reversals in the density or luminance data. Then I 
> copy 
> > >   the "linearize" data line in the bottom of the generated text 
> > file 
> > >   and paste it into the Linearization window of the curve 
> creation 
> > >   module. The original data looks fine to me. 
> > > 
> > >   What the heck am I doing wrong? Below is the linearize data for 
> > this 
> > >   file:
> > > 
> > >   QTR-Linearize-Data version 2.5.2.0
> > > 
> > >   LINEARIZE="95.63 93.09 88.98 85.03 81.23 76.85 71.99 68.03 
> 63.64 
> > 58.9 
> > >   53.9 49.73 44.41 39.95 34.64 28.78 22.71 15.46 10.57 6.85 6.39"
> > > 
> > >   Thanks, Lou Dina
> > > 
> > > 
> > > 
> > >    
> > > 
> > > [Non-text portions of this message have been removed]
> > >
> >
>