Darkened picture is the most important thing is to render the texture of the character's complexion. There are many methods, the most commonly used is the channel calculation method. Make the high light portion of the color in the channel and apply it to the material.
Original
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Final effect
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1, open the original material, the background layer to copy a layer. Enter the channel panel, select the green channel, press CTRL + a all, and press CTRL + C to copy. Select the blue channel, press CTRL + V paste, point RGB channel, and then back to the layers panel, the effect of the following figure.
< map 1>
2. Copy the current layer, add the layer mask, and rub the background part with a black brush. Then create a new layer below the current layer, fill the black, and the effect is as shown below. You can also pull out the characters individually, and then fill the background black.
< figure 2> Next more highlights categories: