QTR-Quadtone RIP

Thanks very much Duane-

I took your advice and remapped the curves.  For the first time I
actually have a 'grey' value, but unfortunately immediately after the
10 patch we're back into the blacks.

I'll keep digging- I had hoped to use some of the BO only curves as
supplied with QTR but none of them help me with the more refined
portions of the greys.  Right now I have white, dark medium grey, and
black within 20% on the 21 step wedge.

Jason

--- In QuadtoneRIP@yahoogroups.com, "dlruckus" <dlruckus@...> wrote:
>
> Hi Jason. Given the info you presented, it looks to me as if you may
> have erred on the 3 lighter inks. Their limits ought to be about 13.3
> on each and they are about 7.5% of the K density where you have only
> 3.xxx for them. I believe the curve creator thinks it is blending much
> lighter inks than they actually are as w3ell as putting down more of
> them(eg:45% limit total).
> Remember that all ink densities are listed in the boxes in relation 
> to the 100% or K ink. You appear to have done that with the C & M but
> not with the Y,LC,LM.
> 
> Hope this is helpful.
> 
> Regards,
> Duane
> 
> 
> 
> 
> --- In QuadtoneRIP@yahoogroups.com, "Jason" <hirsch@> wrote:
> >
> > Good Evening-
> > 
> > I'll preface this with a statement I've always believed: Color
> > Management is (fairly) easy.  Today I'm learning it's not.  I'm a
former
> > Kodak Professional employee who lived and breathed it- and now I'm
> > choking on it :)
> > 
> > That said:
> > My worksheet is at http://www.gotSheep.com/ICC/21target_QuadRip_BW.xls
> > <http://www.gotSheep.com/ICC/21target_QuadRip_BW.xls>   .  For those
> > concerned about XLS files, the graph I created is here:
> > http://www.gotSheep.com/ICC/DensityChart.pdf
> > <http://www.gotSheep.com/ICC/DensityChart.pdf>
> > 
> > I purchased a set of UT2 inks.  After finally getting them loaded into
> > the R280 printer (auto-reset chips aren't working right) I printed off
> > the calibration chart in QTR.  Eyeballing the chart I modified the ink
> > slider to 40%, then printed the chart again.  With that new chart in
> > hand I created a spectrolino calibration target and read the
values in. 
> > Said data is present on sheet one in the XLS file- all spectral data,
> > XYZ, LAB, and Density is present.  Paper white is 0 (1A).
> > 
> > You'll note that the data rounds off on the black at 1.71, and
continues
> > to build on the greys up to the max the printed put down at 40%
> > (1.34/1.07).
> > 
> > That said:  I should have all the data I need to create the printing
> > curve in QTR, but when I do so it's ... well, black cat, coal mine,
> > midnight, 25 speed film.  The 21 step wedge prints 1 step- 0- as
white,
> > and then becomes quite dark (eyeball: 1,0 density) at the 2nd wedge.
> > 
> > My curve I created is here at:
> > http://www.gotSheep.com/ICC/R280_RedRiver_PolarMatte_UT2_BW_mod2.qidf
> >
<http://www.gotSheep.com/ICC/R280_RedRiver_PolarMatte_UT2_BW_mod2.qidf>
> > 
> > In it I go through the calculations to map LK to B for Cyan/Magenta
> > (copy the curve from) (seen here:
> > http://www.gotSheep.com/ICC/CurveCreator.png 
> > <http://www.gotSheep.com/ICC/CurveCreator.png> ), whereas the
resultant
> > curve looks like this:  <http://www.gotSheep.com/ICC/RRcurves.png>
> > http://www.gotSheep.com/ICC/RRcuves.png
> > <http://www.gotSheep.com/ICC/RRcuves.png>
> > 
> > Now, believing myself to be a fairly intelligent individual that
used to
> > *design* color management systems for sites... having read all the
> > available tutorials on the subject... and lastly really wanting to
see a
> > single print look decent, could I trouble one member to point me in a
> > direction that will stop me from pounding my head into the fresh
drywall
> > in the nursery?
> > 
> > Thanks in advance-
> > 
> > Jason
> > 
> > (The image I'm dying to print is here-
> > http://purduephotog.deviantart.com/art/IR-Tahoe-Meadow-92211698
> > <http://purduephotog.deviantart.com/art/IR-Tahoe-Meadow-92211698>
  - a
> > 35 frame IR panorama taken in Reno with a home-made modified 300D
Rebel)
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
>