Method 1: Colorize with Hue/saturation
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Here’s a way to add a wash of color to an image. First, make a Hue/Saturation Adjustment Layer and set its blend mode to Color. Check the box for Colorize, then use the Hue slider to choose the color you’ll add. To adjust its intensity, move the Saturation slider. Disregard the Lightness slider. Potentially the most intense, this toning solution affects images uniformly.