It seems that my stepwedges will immediately show a visible, sharp
step between 100 and 99% black as soon as I do any adjustments to
shadow or gamma. 0 shadow and 1 gamma looks okay, but makes the curve
look very dark before linearization, and after linearization the step
shows up anyway.
Anyone else experiencing this? I'm guessing it's because these
adjustments tend to make the black curve point almost directly
downwards before it starts to flatten out. I'm wondering if a more
linear black curve would make a smoother gradient in the deep shadows.