QTR-Quadtone RIP

Roy, I guess the next most obvious question, then, is- how are the ongoing new ink setups for QTR being developed in terms of the toner curves then?
I just assumed the best way was to make a new .raw to use, but it sounds like this may be now an archaic method? Is there a better 2009 method?
Thanks,
T

--- In QuadtoneRIP@yahoogroups.com, Roy Harrington <roy@...> wrote:
>
> Hi Tyler,
> 
> It's been so long since I had to use the .raw files I had to re-check it out.
> The rgb-raw-16.psd file is really for the custom RGB curves in the ICC profiles.
> 
> For the simple curve .raw you ought to use a gray version i.e. just one channel.
> You can convert gray in PS but make sure the CM working spaces are compatible.
> It's imperative that you get the same 256 levels.  Check histogram
> after conversion.
> You are also right about the reversal -- the file should go from white
> to black i.e.
> the way we think of "ink" curves not the RGB concept of light - black to white.
> 
> Roy
> 
> On Thu, May 14, 2009 at 11:43 AM, Tyler Boley <tyler@...> wrote:
> > thanks, this is what I presumed.
> > All I wanted to do was get some nasty spikes out of the toner channels down near 100% in the existing curves I've been trying.
> > They are only a problem with some of the PK setups, giving less than ideal gloss differential performance between 90 and 100%.
> >
> > Regarding creating new raws, should the base file used be rgb-raw-16.psd? It looks to me like the existing raw toner files have been rotated 180% from that.
> > Does it matter?
> > Tyler
> >
> > --- In QuadtoneRIP@yahoogroups.com, Roy Harrington <roy@> wrote:
> >>
> >> The Density values are for partitioning multiple levels of toner i.e. M and LM.
> >> The dark one or a single toner would be 100.
> >>
> >> I would start with the highlight/shadow values the same as the ones in the
> >> gray channel.  This gives close to a constant ratio of toner-to-gray ink.
> >> After that you can fine tune with small variations in highlight/shadow --
> >> larger values give less toner and smaller ones give more toner.  You can
> >> do split tone this way but I tend to leave splits to the print
> >> sliders.  As Howard
> >> mentions you can get fine control with custom .acv /.raw curves.
> >>
> >> Roy
> >>
> >> On Mon, May 11, 2009 at 6:08 PM, Tyler Boley <tyler@> wrote:
> >> > I'm not seeing much info on doing more detailed toner content edits. Obviously the limit for overall amount of a given ink, but it's not clear to me what the density setting would be accomplishing in this context, on a single ink toner color.
> >> > So, I'm assuming the highlight, shadow, and gamma setting offer some possibilites?
> >> > Or further, editing a new raw file to use?
> >> > Thanks,
> >> > Tyler
> >> >
> >> >
> >> >
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