This technique (that I learned from Kevin Ames) gives you maximum control and flexibility while changing or adjusting hair color, and because of the use of Layer Masks and an Adjustment layer, you’re not “bruising the pixels.” Instead, you’re following the enlightened path of “non-destructive retouching.”
Open the photo you want to retouch. Choose Color Balance from the Adjustment Layer pop-up menu at the bottom of the Layers palette. When the dialog appears, move the sliders toward the color you’d like as the hair color. You can adjust the shadows, midtones, and highlights by selecting each in the Tone Balance section of the Color Balance dialog and then moving the color sliders.
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