Mark, this makes a lot more sense. The same thing might be able to be accomplished with a simple line graph using density vs time. I have a similar function in my family of curves plotting program. The purpose isn't for display or communication so you will have to bear with me. The density projection function will take a starting density at a specified development time and using a density time curve derived from the family of curves it will determine the development time necessary to achieve a target density. What you could do is take two or three density time curves overlaying Zone System print references.
Originally Posted by markbarendt
ScreenHunter_42 Apr. 20 06.15.jpg
Okay, I just realized that while it would be a cleaner graph, it would probably need a program to do. Your way would be easier to create by hand.