Wondering if someone is able to guide me with where I’m going wrong in linearizing my new piezography system for digital negatives.
Preamble: I created a Quadtone .txt profile based on readings I got a densitometer (in which i calculated the insertion point of each ink and the overall Dmax for my process). I’ve attached the 51-step chart on Pictorico I printed with these calculations, as well as my printed results. So far so good! But my results could be improved with a linearization.
I’ve tried reading my printed cyanotype 51-step chart using the i1 spectrophotometer and Colorport. I used the Piezography 51-step chart as my target, and read my printed target it backwards (since I have sort of foolishly been printing my charts as positives rather than negatives).
After exporting the data, I put it into the Piezography Error corrector (see attached image for my data), corrected for any L*falses, and then exported the CGATS information. I then copied this file into the same folder as the .quad curve I used to print out my first chart. I processed the .txt file and the .quad curve through the Drop-Quad-Profile droplet. I then printed out my new “linearized” 51-step chart, but it looks bizarre to me. As you can see, the final linearized chart seems to jump weirdly in the J and K columns.
Any tips on where I’m going wrong? Do the values I’m getting from reading my printed chart seem normal?