Hi John,
The ink positions in the K7 Carbon column of your handwritten chart are correct. Don’t let the Ink #s on the QTR Calibration target confuse you – they do not refer to Piezo ink shades. (I think they are used in QTR generated profiles which we do not use with Piezography.) Use the color channel labels to correlate with Piezo ink shades.
I don’t do carbon transfer myself, but I have been working with a friend who is learning it. He is using my old 1430 with K6 Carbon inks, and I am making profiles for him since that part is beyond his computer skills. It has been quite a challenge. We have been through 7 iterations so far and are finally getting close to something useful. This is partly due to the fact that he is new to the process, though he is a very skilled darkroom printer in several other processes, and partly due to my surprise at how short-scale the process is and having to do quite a bit of manual work to the individual channel curves. He told me just yesterday that v7 of the curve is looking very close and even better since he cut down on the dichromate a bit. I should be receiving the test samples for reading and further adjustment next week sometime.
One thing I can tell you now is that ink levels for the darkest inks had to be cut way down. Curve view of the last iteration looks like this:
This is a 1430-K6 curve, not 3880-K7, so it’s not a direct translation. But 3880 PiezoDN curves do not use shade 7, so they are 6 channel curves in practice. The only channel/ink position difference is that shade 6 is in the Y position on the 1430 (which has no LK or LLK) while it is in the LK position on the 3880. Ink droplet size is different as well, but I’ll share the curve with you if you want to give it a try. I would need to alter it for compatibility with 8-channels. Let me know.
Cheers,
Keith
PS – Atigun Pass, north side I think. I was there in '98. https://jkschreiber.wordpress.com/portfolios/wider-view-segmented/#jp-carousel-674
PPS – I remember a John Penner from college at the University of Arizona in the early '80s.