I'm using P2 on a desktop, and certainly the availability of only eleven P2 curves (six gloss, five matte) is an issue. But I've been able to use my i1, the relinearisation droplet and the technique outline in that blog posted I linked to earlier to create linear curves for most other papers that I want to use.
For matte papers, I have used the HPR P2 .quad as a starting point for EEM, ISCHW and an uncoated paper from a 300 y.o. historic French paper mill.
For glossy papers, I have used HPR Baryta for IGFS and some of the Ilford Gallerie papers. I've also had success with using Canson Fine Art Baryta as a starting point.
In one of two problematic cases, I've printed the 21x4 using each of the candidate P2 curves - either the six glossy or five matte - and use whichever curve is closest to linear as a starting point. But having to do this is rare.
This approach has always worked for me, such that I've never felt the temptation to create my own P2 or K7 curve from scratch or from an existing .qidf.
---In QuadtoneRIP@yahoogroups.com, <artodd138@...> wrote :
Thanks Walker - do you know of any sample QTR ink descriptor files that you could share as a starting point when using P2 inksets?