Digital BW, The Print

Lou,

I think your analysis is right. I have experienced a similar 
situation earlier. QTR gives this message also of L-values are too 
close to one another, of in in other words: if the L-curve is too 
flat, even if there are strictly no reversals in the curve.

Joost

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Louis Dina" 
<lou@...> wrote:
>
> I "think" I figured out the problem, but I'd love some confirmation 
> from more experienced QTR curve builders.
> 
> I believe I had the ink limit set too high, which bunched the deep 
> shadow values a little to close together.  There was 'some' 
> difference between shadow values, and they always did increase (no 
> reversals), but it appears that wasn't enough.  I am guessing the 
> curve creation module looks for a minimum difference between 
patches 
> before it will accept the linearization data.  
> 
> I lowered the ink limit, bumped up the black boost, and this gave 
me 
> the same Dmax but much more spacing between shadow values.  When I 
> did that, it seemed to work.
> 
> Does this sound about right?
> 
> Thanks, Lou
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Louis Dina" 
> <lou@> wrote:
> >
> > Sorry....I posted this on the QTR forum, but it is a little slow 
> over 
> > there.  Please excuse the 'cross post'.
> > 
> > *************************************
> > 
> > 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 increasing. 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 in the L* 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 data 
pastes 
> > fine looks fine to me.  It is listed L* units in descending order 
> as 
> > in other profiles I have built successfully.  
> > 
> > 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
> >
>