In this video, we learn how to use PhotoShop to change hair color.. First, select the mask tool inside PhotoShop. Now, zoom in on your picture and brush the hair that you want to change the color of. Zooming in and using smaller or bigger brushes will help you be more precise. After this, zoom out and press on the mask tool to create your selection. Then, select the marquee tool and right click and choose "inverse selects". Now, click on "image", "regulations", then "tonality/saturation". Now you can change the color of the hair to any color that you choose using the color bar on the screen. Once finished, save your picture and you will have a new hair color in no time!