Digital BW, The Print

Lou

First of all thanks for such an informative reply. The design of the 
Black and Light Black curves was pretty easy because as you pointed 
out I based them on the UC ink curves for the paper that I was 
profiling. I used the EyeOne to measure the L values and adjusted the 
shape and ink limits to get a nice smooth curve. That was the easy 
bit. The harder bit was tonning. Understanding the relationship 
between a and b values, and the fact that there were no suitable 
curves to use. The Fotonic inks are cooler than the Epson inks. 
Initially I tried to get both a/b values zero, but after a check 
print decided that the result was too warm, yellow for my taste. I 
guess this is because of the base colour of the paper. Ilford Smooth 
Pearl gives me values of 96, -0.15 and -5.36. So I cooled things down 
a bit with b values averaging -6. I have no postive to negative 
shifts in values. The values do increase slightly. The bigest 
increase is from steps 24 to 26. The b values are pretty constant 
ranging from step 5 -6.02 to step 23 - 6.86. The a values are not as 
good they range from 0.15 to 2.97.

Do these values look sensible to you. Would you tweak the a values ?

The print looks darn good. The best I have achieved yet. I really do 
like OPM/IJC. The more I work with the program and try to understand 
it the more I like it.

Once again Lou many thanks.

Peter.