Quote Originally Posted by afrank View Post
Indeed that is the PDF where I got the ref CMY values. I guess I will just scale my values from the maximum 100~grade 4. Any idea on what scale to use? Log, linear? other?
They are all log scales.

15 = 1/2 stop, 30 = 1 stop.

Only reason they give different numbers for enlargers with different ranges is that you have to make different compromises depending on the range you have (or you have more options when your colorhead has a longer range).

There might be more to it... They may also have done tests with specific enlargers to find optimum values per enlarger.

But they are all log scales.