QTR-Quadtone RIP

Tom,

WOW, thanks indeed for the pointers, I'll get to work straight away 
and try to get excel doing what you say.

I'm not familiar with Roy's utility (being quite new to QTR) is 
there a link available?

regards, Jamie



--- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...> 
wrote:
> Jamie
> 
> I see you have xrite's toolcrib and a densitometer. What I do, is 
print a step wedge (I use the 21 step), and then measure the density 
of each step. Using toolcrib, I pop the density readings into an 
excel spreadsheet that displays the densities as a graph. I can see 
how the density of each step increases over the 0% to 100% black 
range. It should be uniformly increasing over the range (i.e. it 
should not decrease). I usually end up printing the stepwedge 
several times as I adjust the Highlight, Shadow, and Gamma 
parameters to bring the density curve nearer to linear. My 
spreadsheet is set up to store and plot the density values from a 
number of runs as I (hopefully) get closer to my final curve. 
Plotting several stepwedges lets you see the effect of changing the 
parameters.

The spreadsheet also can compute L* values from density so I can use 
Roy's utility to create an ICC profile of the final curve for 
previewing in
Photoshop.

> Tom Moore


 
> > -----Original Message-----
> > From: QuadtoneRIP@yahoogroups.com 
[mailto:QuadtoneRIP@yahoogroups.com] On
> > Behalf Of Jamie
> > Sent: Sunday, August 28, 2005 12:30 PM
> > To: QuadtoneRIP@yahoogroups.com
> > Subject: [QuadtoneRIP] Re: Curve building?
> > 
> > Thank you Tom,
> > 
> > I don't really understand "if you plot your density curve prior 
to linearizing" could you elaborate. I've spent the last couple of 
days and nights absorbing you superb User Guide and feel i'm pretty 
close to getting the output I really want,
> > 
> > regards, Jamie
> > 
> > 
> > --- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...>
> > wrote:
> > > Jamie
> > >
> > > You need to get your curve closer to linear by "hand" before 
you linearize. Roy will know the specific cause of your error 
message, but in general, if you plot your density curve prior to 
linearizing, it should be more or less uniformly increasing over the 
density range. If there are dips or large bumps in the grey or toner 
curves, use the Highlight, Shadow or Gamma values to smooth them 
out. Once the curves are fairly smooth then use the Linearize to 
finish them.
> > 
> > > Tom Moore
> > 
> > 
> > > > -----Original Message-----
> > > > From: QuadtoneRIP@yahoogroups.com
> > [mailto:QuadtoneRIP@yahoogroups.com] On
> > > > Behalf Of Jamie
> > > > Sent: Sunday, August 28, 2005 11:55 AM
> > > > To: QuadtoneRIP@yahoogroups.com
> > > > Subject: [QuadtoneRIP] Curve building?
> > 
> > while trying my hand at a little curve building, and then trying
> > to linearise the curve, I keep getting an error "linearization
> > failed - not constantly....."
> > 
> >  Anybody got any ideas?
> > 
> >  regards, Jamie