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QTR-Quadtone RIP

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Message

New User UT2 / QTR setup problems / Red River Polar Matte

2008-09-08 by Jason

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)



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