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ben egbert wrote:
Hmm, now I have to ask, why do we say gamma when we mean to adjust curves or levels?
Well, gamma & curves aren't quite the same thing.
I'm guessing that since gamma goes back to exponential profiles being applied to linear input at the "global" level for display/film purposes, the distinction of "gamma" retains global application ... whereas for curves, it is selective application of exponential adjustment. Gamma is applying a "single" uniform curve ... Curves has the capability of applying "multiple" (plural), non-uniform curves ... thus a distinction in nomenclature. Levels ... is likely a pseudo-repackage of Gamma into a 0-255 scale to coincide with typical 8 bit RGB values to make it more "user friendly" to follow.
But, this is all just a guess.
As there are several ways to do things in PS ... some of them show up duplicated in different places / modes / modules. But in building a database/software, you can't always have things named the same even if they do the same thing, depending on how it is structured.
For the sake of normal images, I probably know what I need here. I often bump midtones, I just never think of it as gamma. But I still don't know how to apply an exact 3 gamma boost.