Open a picture
In this case we want to change the color of his shirt. So we add a Hue and Saturation Adjustment Layer and we choose the 'red channel'. By dragging the Hue slider to the right of the left we can change the color of his shirt.
Be aware that all the red colors in the pictures are changing, but with a mask and a black brush we can mask part out that we still want to have red. In this case in his face and some spots in the background.
So its fast and easy.
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