QTR-Quadtone RIP

Hi All,

I am currently attempting for the first time to build some curves in 
QTR for some new papers I am trying. I am using a ColorVision 
measuring device. I am using Epson Ultrachrome inks. I am working 
through Tom Moore's very comprehensive instructions.

I have some questions about the Characterizing the Ink Paper 
Combination process:
1. I assume we are only concerned about the black strip on the 
printout to assess ink limit. Is that correct?

2. My black strip looks very blocked up at the darker end. This is 
confirmed by measurements as follows:
55%	1.87
60%	2.00
65%	2.05
70%	2.07
75%	2.13
80%	2.16
85%	2.20
90%	2.22
95%	2.23
100%	2.23
Based on this data, I am tempted to use a limit of 75%. Is this a 
prudent interpretation or would 85% be better?
 
3. I tried 70% just to experiment and the darkest swatch measures 
2.1 - does mean that if I use a 70% ink limit that my dmax becomes 
2.1 on that particular paper?

4. Assuming the answer to (3) above is yes, is the whole 
characterization process about optimising the compromise between dmax 
and blocked up shadows?

Any and all responses very much appreciated.

Thanks and regards

Alistair Owens
owens@...