Thanks, will probably start off with HC110
You've got HC-110 curves, as I recall... they DO have a bit of an up-sweep.
I believe this up-swept curve would be beneficial to portraiture, where the customer's facial tones need the best separation...
But it would drive Ansel Adams nuts trying to hold highlights in check - thus leading him to conclude the diffusion enlarger is the only way to go...
Yes, I think it would give you more details and information in the area where the viewer is looking. My curves in D-76 tend to be relatively straight-line until above 1.2 density, so the effect is "above Zone VII" for me. In my case, I tend to have my high-density step wedge values towards the outside of the film, where agitation effects provide more development action. So I ignore it.
Quickly getting out of my league because I am a nature/landscape photographer - and the portraits I do are typically candid/available light.
In another thread, an upswept curve is viewed as a defect.
Thank you, Bill. It is very helpful for me to learn how different aspects of a curve's shape are used by photographers in their practice. As you know, I am a newcomer to graphing characteristic curves, and I am still surprised by the relative meaning of their nuances in the pictorial domain.