QTR-Quadtone RIP

in my experience of trying to create one myself, an overlapping ink profile
is very very hard, I gave up.

Jon Cone gives us one for the K7 inks and I "tune" that to my printer/paper
set up using QTR ICC, Jon will also create a custom one for your specific
printer /paper. I am amazed by the linearity of Jon's profiles.

Paul Roark's website is the one to look at if you are home brewing.

Good luck.

Mike



2009/8/12 Joost Horsten <j.h.j.h@...>

>
>
> --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com>,
> "robert49brake" <robert49brake@...> wrote:
> > I can see from your readouts that the Piezography profiles/inksets are
> getting something I cannot duplicate with QTR and a custom inkset I'm
> playing with. The inkset is Eboni Matte Black and 6 dilutions of HP Vivera
> Black plus glop. The obvious goal is a dedicated b&w 8 head printer with
> matte and glossy capabilities. (I've been patiently waiting for J. Cone to
> do all the work:) Piezography seems to be going in another direction so I
> decided to play with it myself.
> >
> > The hang up on this and a previous UT-3D inkset with the 1800 has been
> separation in the deepest shadows and artifacts at the transition to the MK
> ink. When looking at Cone's .quad files he obviously has a different method
> of profiling (creating the curve files) for QTR. One obvious aspect is that
> he is able to overlay his individual ink curves in a way that QTR, in it's
> native partitioning, does not. Everything in QTR seems to be contained in
> the .quad file instructions to the printer, but, how you get there seems a
> matter of choice.
>
> I'm currently playing around with a R285, also a 1.5pl printer and I'm
> planning to play with HP Vivera dilutions as well. I've not decided yet to
> go for a 3K multi-purpose tonable matte-gloss setup or for a 5K or 6K setup
> like yourself.
>
> How you profile with QTR? Just straightforward all inks as gray inks?
>
> I was considering (but have not tried yet) an alternative approach:
> - combine K , LLK and LLLLK in a QTR GRAY curve
> - combine LK, LLLK (and LLLLLK if present) in a QTR TONER curve
> You can easily simulate this in QTRGui. Of course, ink limits have to be
> reduced.
>
> In this way you get a much larger overlap between the inks: 3 inks in the
> darkest area, 4 in most of the tonal range and still 2 in the highlights.
> This should give (much?) smoother transitions between the inks. Many
> comments about the Piezograhpic inks are actually about their profiles and
> their large overlap of inks.
>
> As I've still to make the dilutions so I can't try this yet, so I've no
> hands-on experience yet.
>
> Any thoughts or experiences?
>
> Joost
>
> 
>


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