Digital BW, The Print

"Joost Horsten" <j.h.j.h@...> wrote:
>
> <pr_roark@> wrote:
> > Lab L    A       B
> > 96.76	1.61	-0.12

> That's a bit odd... my eye-one gives (consistently) Lab a and Lab b values for HPR paper white around Lab A=0.6-0.7 and Lab B=0.1-0.3. The deviation seems larger than the system noise...

I look at the starting points at usually within 1 unit of where they probably ought to be.  In comparing multiple units of PFP, i1, and another X-Rite I have, they all seem to be slightly different. I'm not convinced that at the price point of the PFP spectro more accuracy is possible.  However, the relative increase or decrease from the starting points seem to be more consistent.



> 
> As this is the most cumbersome part to experiment with: what would you choose as dilutions for LK cool and LLK cool? I was thinking of 33% (3:1) and 17% (6:1) but could easily do something different.

I use 30% for each step -- that is, LK = 30% PK + 70% base.  LLK = 30% LK ...

I've used 50% to 20% steps with good results.  So, you have some flexibility.

Paul
www.PaulRoark.com