QTR-Quadtone RIP

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]
> >
>