Originally Posted by
DanK
I want to vouch for Manfred's technique of dodging and burning with curves. I learned it from one of Manfred's posts and now use it for all of my dodging and burning. However, I still use a brush rather than selections.
Re avoiding changes in saturation: I often do that as well. However, it is not necessary to switch to LAB mode to do this. All you need to do is change the blend mode of the curves adjustment layer from normal to luminosity. (Conversely, you can also change it to color to avoid affecting luminosity.) Quite some time ago, I did identical edits of an image using the LAB and luminosity blending and posted the results here. The two were virtually indistinguishable. Using a luminosity blend is easier. It allows you to go back and forth at will, and it allows you to blend regular (RGB) tonality adjustments and luminosity-only tonality adjustments in any mix that you want. I sometimes duplicate an adjustment, set one layer to normal and the other to luminosity, and then use opacity to mix the two in varying amounts until I get what I want.
This applies to any tonality adjustment, not just dodging and burning. In fact, I find that it matters more for contrast adjustments than any other, and I have uses a curve to demonstrate this when I've taught how to use luminosity blending.