QTR-Quadtone RIP

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]
>