Hello! Today i\'ll show you how to change hair color on a photograph. I should warn you though, this technique is not suited for blurred pictures or entirly black hair. You have to see the hair actually. It sounds weird, but go ahead and try it. You\'ll see what i ment.

Open your image. This is picture I googled

Create a new layer at top of your image layer using CTRL + SHIFT + N. Now use Brush tool (hotkey B)

Then use this tool to draw over hair on the picture. Make sure you are drawing on your new layer, not on the layer with your image and make sure that your foreground color is black (if you are not sure, just hit D key). I came up with something like this.

And now for the final step. Change blending mode of your second layer (the one you were drawing on) from Normal(as seen on picture) to Soft Light, or overlay, depending on your expectations.

As a result, i got this:

You should feel free to experiment, with different colors of brush tool and blending modes. The result might surprise you in a good way.