QTR-Quadtone RIP

Louis,

I struggled with the same thing for a couple of years until I finally  
realized the same thing you did. It is better to start with a more  
conservative max density for building curves, and after you have  
everything working right, then you can mess with BOOST K, OVERLAP, etc.

James Haney



On Oct 13, 2007, at 9:58 AM, Louis Dina 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]
> > >
> >
>
>
> 



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