QTR-Quadtone RIP

Hi Paul.

You lost me with this statement:

"I set this with a single 21-step curve printed with a straight line 
curve profile.  I make the curve by entering the coordinates (0, 0) 
and (100, 100) in QTR's "Point List."  (Tools>Curve 
Creation>Curve>Point List tab)  In short, on 21-step print takes care 
of dmax and all ink limit (and black > boost) issues in making the 
profile."

I understand the concept of setting the default ink limit just before 
it reaches the unreliable flat zone, but my copy of QTR doesn't seem 
to have the features you refer to (at least I can't find it).  I am 
using v2.5.2.0 on a Windows XP machine.

When I go to Tools>Curve Creation, I see no "Curve" or "Point List" 
tabs to select.  I'd love to understand exactly what you are doing 
and recommending, but I am confused at this point.

Thanks, Lou


--- In QuadtoneRIP@yahoogroups.com, "Paul Roark" <paul.roark@...> 
wrote:
>
> I think my experiences are consistent with the views of this thread.
> 
> 
> >> I had my default ink limit set fairly high initially, 
> >> where the curve was getting very flat. 
> >>... The 90, 95 and 100% tones were bunched up pretty close. 
> 
> Some set their dmax not to the point of absolute darkest, but to 
that point
> where the curve becomes so flat the noise and variables might cause 
future
> posterization.   
> 
> Usually the higher the load of an ink (more pigment particles 
relative to
> base), the sooner it will reach the point where the curve's slope 
is too low
> to be useful or reliable.
> 
> The MK is the highest load ink.  So, I use it for the default ink 
load.
> Usually you can then simply ignore the black boost and other ink 
limits.  I
> set this with a single 21-step curve printed with a straight line 
curve
> profile.  I make the curve by entering the coordinates (0, 0) and 
(100, 100)
> in QTR's "Point List."  (Tools>Curve Creation>Curve>Point List 
tab)  In
> short, on 21-step print takes care of dmax and all ink limit (and 
black
> boost) issues in making the profile.
> 
> >... 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.
> 
> Among other things, I prefer to have a reasonable good curve going 
into the
> linearization.   With respect to the adjustments in the tabs 
between the Ink
> Setup and Linearization tabs, I leave adjustments in their default
> positions.  As one expert once commented about Gimp print in another
> context, it has lots of controls, but most of them are not worth 
bothering
> with.
> 
> Paul
> www.PaulRoark.com
>