I'm hoping someone can help me understand how the differences between these controls and why I would choose one over the other. It seems to me that they all affect my photo similarly, and I'm not sure what I'm doing if I use them “on top” of each other. I often find that I will use the new “Auto Enhance” feature, which uses both curves and shadows, then I often make adjustments with levels afterward. Is this affecting the curves histogram? Are there some photo subjects that respond best to one control over another (i.e., landscapes vs portraits?) What has been your experience in using and choosing Curves, Levels, Hightlights/Shadows, Contrast? Perhaps there's a tutorial on this site that I haven't found. Any and all tips appreciated! Thanks.
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