I started using the PiezoDN system with the old ink setup (5 inks including the special shades 2.5 and 4.5), on a 3880. I use the negatives to make Pd prints.
As a kick off to start the linearization process I used a specific curve made for the older ink setup: PiezoDN-X8-meth3-1_7v2. The 129 step tablet print with this curve is shown in photo 1. With a Spyder spectrophotomer I measured the Lab-values. These values looked quite normal, going from appr. 96 to appr. 21, in descending order.
With these values I linearized a new .quad curve: WD-Pd-20161227. I printed a 129 stepwedge negative with this curve and made the Pd-print. The print (photo 2) doesn’t look good and the Lab-values are definitely wrong. I sorted the L-values in columns corresponding with the rows of the print; in photo 3 the first 4 rows/columns are shown. The first row/column (I call them row from here) is OK, but from the second row something very strange is happening. There is a huge drop from the last value of the first row and the first value of the second row, and from the second to the third row, etc. Within a row there is hardly separation. This continues until the final row of the Pd-print.
I made a print of the two .quad curves (photo 4) and I checked the inks positions (they are as they should be):
- shade 2 on C
- shade 2.5 on VM
- shade 3 on LC
- shade 4.5 on LK
- shade VLM
I cannot explain or understand what is happening and I’m very lost now. Please help someone!