QTR-Quadtone RIP

Tyler, interesting idea. I will keep a more open mind as to how to leverage
the blending.

Txs,

Mike

On 6 March 2010 18:20, tboleyyh <tyler@tylerboley.com> wrote:

>
>
> one more possibility Mike- have you thought of using the curve blending to
> help with this? I don't know your inkset, but if you don't need the blending
> in QTR for hue adjustment, you can use it to blend curves made with other
> parameter differences. For example, one curve might be made with huge
> overlaps, one medium, another none. Blend them so the highlights are 100%
> huge overlaps, mids medium, shadows none... or some such variation..
> Just a thought, the main idea being that the blend options in the driver
> can be used in other creative ways than the hue variations for which they
> were intended...
> You could even blend a tritone with a hextone.. for more complex dotwork,
> etc.. you get the idea..
>
> Tyler
>
> --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com>,
> Michael King <drmrking@...> wrote:
> >
> > Tyler,
> >
> > > Mike, you are up to some very cool things, really impressive. Very
> > > interested in hearing about the ink.
> > >
> > I like it more than I expected. Paul Roark has done all the hard work, I
> am
> > just standing on his shoulders. Works great in R1900. I am using18% Eboni
> as
> > toner in 3/4 tones.
> >
> > > I think I know what you mean regarding my question... I'd import a
> > > different toner curve based on tests, which requires another start
> > > linearization, and then the proportion of toner to grays in various
> tonal
> > > areas has changed from that which I had used to base the curve edit
> upon...
> > > round and round. That's ok, I accept that for this particular project,
> if
> > > I'm getting the picture.
> > >
> > Yes that's exactly the issue, round and round we go and there is no way
> to
> > predict the outcome, though you can guesstimate better after the first
> > linearization.
> >
> > > Let us know how your work goes, really intriguing. Can you overlap
> > > progressively less moving down to the low end? So you have K only at
> 100%?
> > > Everything get's a bit jammed up down there and it's hard to control...
> > >
> > I am not sure, I think not for maximum smoothness. So I may just generate
> > two curve sets one for maximum smoothness based on Cone style overlapping
> > ink curves and one for maximum dmax based on QTR curves.
> >
> > Mike
> >
> > >
> > > Tyler
> > >
> > >
> > > --- In QuadtoneRIP@yahoogroups.com <QuadtoneRIP%40yahoogroups.com><QuadtoneRIP%
> 40yahoogroups.com>,
>
> > > Michael King <drmrking@> wrote:
> > > >
> > > > Hi Tyler,
> > > >
> > > > I think the answer to your question is yes, but ...
> > > >
> > > > Having experimented over the last few months with HP-C6 aiming for
> > > neutral
> > > > and needing to warm it up in the 3/4 tones to achieve that, I got
> very
> > > > frustrated with the inflexibility of QTR to re-linearise after
> editing a
> > > > toning curve.
> > > >
> > > > The problem is that you can add a toner as you describe below, but
> when
> > > you
> > > > linearise the tone curve will change and you can't edit it further,
> you
> > > can
> > > > only start again with a new tone curve. There is no way, I can see,
> to do
> > > > sequential linearizations in QTR and that's a real pain.
> > > >
> > > > My solution was to write my own linearization program that takes a
> set of
> > > > QTR curves (actual ink values in Quad file) and linerarizes them.
> This
> > > let's
> > > > me edit a toner curve ink values (often manually in Excel) and
> > > relinearize
> > > > them again. It even allows me to look at the predicted re-linearized
> ab
> > > > curves before I print them and decide if I need to tweak them
> further.
> > > >
> > > > Through testing this HP-C6 approach I also discovered that the QTR
> curve
> > > > model that doesn't use many overlapping inks, is suspectable to
> > > > posterization. I had a print that posterized and someone suggested is
> was
> > > > possibly a problem with QTR curve model.
> > > > So I created another curve model that was more like Cone's model
> where
> > > the
> > > > inks overlap much more and indeed the posterization problem was
> solved.
> > > BUT
> > > > the cost of this overlapping ink approach is reduced dmax. On Canon
> Rag
> > > 310
> > > > the dmax drops from L=15.3 to L=16 due to the other inks polluting
> the
> > > > darkest ink. So you've got to choose between the limitations of the
> two
> > > > approaches.
> > > >
> > > > Learn't a lot about QTR in the last few months.
> > > >
> > > > Mike
> > > >
> > > >
> > > >
> > > >
> > > > On 5 March 2010 23:06, tboleyyh <tyler@> wrote:
> > > >
> > > > >
> > > > >
> > > > > after going through all the references I can find, it looks to me
> like
> > > the
> > > > > Photoshop curve import function in the Windows version with curve
> > > creation
> > > > > is the most straightforward, current, and viable approach to making
> > > unique
> > > > > toner setups..
> > > > > Would you QTR experts here agree?
> > > > > Thanks,
> > > > > Tyler
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  
>


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