QTR-Quadtone RIP

Hello

(this is my first post to this group, so I apologize in advance if this is
a FAQ)

I am trying to profile my Epson R265 (R260 in the US) using a 21 grey wedge
and a SpyderPrint 3 spectrometer. I have installed the Ultratone 3D inks
(using the matte black ink). So far I have created profiles for a few matte
papers (Hahenmühle Photo Rag, Ilford Heavyweight Matt Paper and Ilford
Galerie Smooth Fine Art Paper) with some success.

I now would like to profile the the Ilford Galerie Gold Silk (a baryta
paper, which I rather like), but when doing so I get LAB values which are
inverted at the black end (See results as the bottom). When I inspect the
black end of the wedge, I have the impression, that the spectrometer is
right and that  the last two patches are not as black as the 85%  patch. I
am printing this using a "Epson  Semiglossy Paper" setting in the printer
(Using a Glossy paper setting did not change anything).

So what are my options? Should I switch to the photo black ink for this
paper? (If yes, is it sufficient to run a cleaning cycle with the exchanged
ink cartdridge to get a clean setup?) - This would have the disadvantage
that the autoreset in the chips would kick in every time I want to switch
papers, which I would like to avoid.

Assuming, that the printer driver is saturating the paper on the black end,
it probably would make sense to limit the ink applied, but I could not see
a way to limit the amount of ink used (unless I turn on colour management,
which defeats the purpose of profiling).

For the moment I would like to stick to using ICC profiles (a workflow I
understand reasonably well) and not go the full route to QTR. Is this
possible?

Are there any other options?

Thanks in advance,

Andrew


BEGIN_DATA_FORMAT
SampleID GRAY LAB_L LAB_A LAB_B
END_DATA_FORMAT
NUMBER_OF_SETS 21
BEGIN_DATA
1 0 97.79 1.48 -0.92
2 5 93.62 0.94 -0.53
3 10 89.39 1.21 0.01
4 15 84.60 1.52 0.52
5 20 80.82 1.21 1.17
6 25 77.07 1.45 1.75
7 30 72.85 1.51 2.10
8 35 68.91 1.73 1.84
9 40 65.10 1.34 2.37
10 45 61.74 1.72 1.79
11 50 57.21 0.76 2.41
12 55 52.99 0.76 2.05
13 60 48.98 1.22 1.23
14 65 45.04 0.87 1.74
15 70 40.39 0.21 1.89
16 75 34.18 1.37 0.23
17 80 25.78 0.18 2.60
18 85 12.72 -0.05 2.61
19 90 4.65 -2.38 4.97
20 95 8.82 -0.72 2.17
21 100 16.48 -2.47 1.10
END_DATA


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