I have found and read a lot of tutorials that speak individually about curves, levels and contrast in post-processing but no luck so far about finding something that compares them.
It is my understanding that curves is the most flexible tool, while levels is more simplified and the contrast slider is even more simplified. Is this the case?
To put it another way. Am I correct to assume that I can do with curves anything that is possible with levels (and more)? Do I need to bother with the contrast slider at all if I am accustomed to working with curves?
Answer
Yes, your assumption is correct. A levels control is basically the equivalent of a curves control that can only be adjusted at the end points and one point in the middle, while a contrast slider is (usually) the equivalent of moving both ends at the same time (although some may be more sophisticated). The curves tool gives the most flexibility, but also allows you to create very unnatural-looking results.
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