Levels, one can make darken or lighten shadows, midtones, or highlights of an image. Similar effects can be achieved using
Curves, but I believe
Curves mathematically allows more possibilities than
Levels. However, nonetheless, it works as a mapping between the original set of HSL values onto a new set of HSL values.
I'm wondering after one goes through an combination of these adjustment layers, if there is a way to replicate the overall effect using a
Gradient Map. Or are there things that one can simply not achieve with a
Gradient Map that
Levels layers are capable of?