That's one purpose for a mask. The example from Theory of the Photographic Process was to show the effects of a mask on local detail in the print compared to a print from the negative alone. What adds to the apparent complexity is that it illustrates this with two different paper grades.
Originally Posted by markbarendt
I actually have a function in my family of curves program that's similar to your idea. It defines a specified density range in the curve family. I haven't used it in so long, I forgot it as there. The bottom reference is fixed at 0.10 over Fb+f but it wouldn't take too much effort to make it adjustable. The curves are plotted minus the film base.
Family of Curves Density range.jpg
Last edited by Stephen Benskin; 04-20-2013 at 08:31 PM. Click to view previous post history.