Method 4: Add Color by Hand
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Here’s a way to add any color you like to any area of your image. Make a new, blank layer, and set its blend mode to Color. Grab a soft-edged brush, and double-click on the foreground color in the toolbar to choose the tone you want. Paint it in where you want it. If the color is too intense, reduce the opacity of the brush (not the layer) to control the effect. If you find you’ve built up too much color, use the Eraser tool at any opacity to reduce or remove it.