QTR-Quadtone RIP

Randy, 
   The short answer to your question, I think, is that you can
increase the maximum ink from primary gray channel (C in this case) by
increasing the overall default ink limit.  There shouldn't be any
think from the K channel unless you have specified it.

I have also made a set of curves for the UT-14 inkset and Gold Fiber
Silk, which are available here in the "Files" section.  The highest
density I obtained was about 2.2, with an ink limit of about 40%, just
as you estimated visually.  This makes me wonder whether your
densitometer might be leading you astray.  I did not use a
densitometer, per se, but used a flat bed scanner that I had
calibrated with a Kodak step tablet.  The calibration tablet only goes
to 2, though, so it could be that the exact values at higher densities
might not be correct.  But, from my experience I would be very
surprised if the density really increases much with inkloads greater
than about 40%.

I would be interested to hear if you have tried my curves for this system.

Hope this helps,
David

--- In QuadtoneRIP@yahoogroups.com, "Randy Rancier"
<randy_rancier2004@...> wrote:
>
> I am currently working on a curve using an Epson 1400 w/ UT14 inks
on Ilford Galerie 
> Gold Fibre Silk, and I am in the process of trying to maximize the
dmax.  The inksets are 
> as follows:
> 

> Here is my dilemma, I selected a ink limit visually at 40% (2.27)
without the aid of the 
> densitometer readings, but the dmax actually occurs at about 70%
(2.39) according to the 
> densitometer readings.  Since this is a glossy paper, the Eboni in
the K position is not 
> used.  So this is all done with the Photo Black inks in the C, M,
LC, and LM positions.  I 
\in the 100% square.
> 
> Therefore, my question is, is there a way to boost the PK in the C
position without using 
> the Eboni in the K position?  I wasn't planning on using the Eboni
with the addition of 
> GLOP as I felt that a dmax close to 2.39 would be pretty good, so
why complicate things; 
> and I have no idea what kind of dmax the Eboni with GLOP would produce.
> 
> What I am going to try next, unless anyone has a better suggestion
is to increase the ink 
> limit on the Cool PK and recalculate the crossover points.  My only
fear of doing this is that 
> the blacks in the deep dark shadows may block up.
> 
> Any suggestions you may have will certainly be appreciated.
> 
> Thanks,
> Randy
>