QTR-Quadtone RIP

Thanks David for your reply; sorry I haven't replied before now, but I've been busy learning 
and figuring out QRT and some of it's idiosyncrasies.

I did learn that you can boost other inks other than the one in the K ink slot of the printer, 
according to Roy.  I say this because I haven't tried it yet, because I didn't end up needing 
to.  I will post Roy's description on how to do this below.

But before I do I wanted to answer your question, yes I did download your profiles and 
tried them out.  I wanted to see what I could do and perhaps get a more customized 
profile for my total system and individual printer.  Please see my next post that I will 
labeled "Observations of interest to QTR users" for some of the details that I believe may 
be of interest to others as well, and the reason for a separate post.  But in a short I was 
able to get up to or close to a dmax of 2.30 with the UT14 inks and IGGFS paper.  What 
was really strange was how this was accomplished, so see my next post.  I will upload my 
profile in the near future and inform you directly when I do so; that way you can do a 
comparison if you like.

Here was Roy's reply directly to me concerning Boost:

"As far as BOOST_K is concerned it will work on the ink that is in GRAY_INK_1 i.e. the one 
with VAL=100.  So if that's where C is that's what will be boosted.  If you want no eboni (K) 
make sure K isn't in the profile somewhere and LIMIT_K=0"

Randy


--- In QuadtoneRIP@yahoogroups.com, "dpgoldenberg33" <dpgoldenberg33@...> wrote:
>
> 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
> >
>