Originally Posted by photomc
I understand what you are asking now. If you have a scene such as a church scene, for instance. In this scene let's assume that you want to show no detail in minute areas like a door knob...then don't worry about where they will fall on exposure. But in this same scene you want to show detail in the stained glass windows, for instance, and you want these to render a Zone IV print value. Then expose your film at that exposure.
Taking this a step further that when you check the white siding of the church, with your spot meter, you find that it indicates a Zone X exposure. You know the white siding will not, under normal development, render with any detail at that value. So the answer is process for N-2 development so that the siding values come down to a Zone VIII tonal value. In other words decrease development to bring high contrast down. Increase development to bring flat contrast up.
Ilford FP4 is a good film. It is adaptable to modifications of contrast through altered development.