THIS ARTICLE WAS UPDATED OCTOBER 2011.
1. Duplicate Your Layer
Duplicate and rename your layer (this is something that you should get in to a habit of doing).
2. Adjustment Layer
Select the adjustment layer icon at the bottom of the Layers Palette and select Hue/Saturation.
When the new window opens, tick the colorize box and pull the Hue slider up or down to change the colour of the hair. You can also adjust the saturation and lightness if you wish but be careful when using the lightness adjustment as your image can end up looking too bright. While you're playing around with the colours, change the layer blend mode to soft light so the colour changes appear more natural.
3. Do Some Painting
Next, select the Paintbrush tool, making sure your foreground colour is set to black. Then, as we created an adjustment layer, you can paint over all of the image apart from the hair to remove the colour that you've just applied, changing your brush size, flow and opacity as needed.
Take your time while doing this, especially when working along the edge where the hair meets other parts of the image to ensure the new colour stays where it's meant to be and is removed from places it shouldn't be applied. Try zooming in and adjusting the size of your brush. The easiest way to zoom in to part of the image is with the magnifying tool. Press Cntrl and + on your PC's keyboard to zoom in and Cntrl and – to zoom back out.
Portrait with the hair colour changed:
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