2018-12-09 by per@...
Hi Terry. I have recently gone through the process to create a silver digital negative profile for a stock p800 from start to end (in fact. my first print using this flow was last night). I would suggest you look at Keith Schreibers page at https://jkschreiber.wordpress.com/platinumpalladium-notes/digital-negatives-with-quadtonerip/ and pay attention to the back and forth between me and Keith in the comments. Armed with a densiometer, it was really not too hard to make a workable p800 digital negative profile. Is it the best possible one? I don't know yet. But my first print using this profile looks good on fiber paper. My next step will be to print a high quality inkjet print of the same picture and compare to see if there is a difference in tonal gradation and smoothness between the two versions. The sharpness is defintely good enough. Would piezography be better? Probably. But I am starting where I am at.
You may also want to know that Walker Blackwell sells a system at bwmastery that aims helps you through the process (https://www.bwmastery.com/quadtoneprofiler-digital-negatives/). I have not tried it, as I wanted to figure things out myself first. It may offer better controls for linearization than just doing a greycurve and then linearizing. If you try it, let me know what you think.