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Dermabrasion is a very important part of portrait repair. It can eliminate spots and acne marks on the skin and make the skin whiter, smoother and more delicate. There are also many methods of skinning, such as blur, channel skinning, high and low frequency, neutral gray, hyperbolic, plug-in skinning and so on.

Today, let's talk about channel peeling.

Before the tutorial begins,

Let's first understand the principle of channel skinning.

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Why is human skin not smooth?

This is a picture of a portrait waiting to be skinned. You can see that there are many spots, which are not smooth enough. What on earth are these spots? When you enlarge the picture, you can see that the spots appear as darker patches of color in the photo, while the smooth areas around them are brighter. Therefore, to make the skin smooth, it is necessary to make the colors brighter.

How to make the color block bright

The easiest way to brighten a dark area is to brighten it with a curve. To brighten the dark area, the bright area should not be affected, so the dark area should be selected. The constituency should be selected accurately, and the boundary transition should be natural. Transitional natural selections can be created with channels. To accurately select spots, it is necessary to change the spots and bright areas into grayscale channels with different brightness. "calculate" or "apply Image" is suitable for this step.

Ps channel peeling steps

01, spot pimples-smooth skin separation ① use the repair brush tool to remove large spots, this step will not be repeated. Then, open the channel panel and find a channel with high contrast, where I choose the blue channel, copy the blue channel, and get a copy of the channel.

② processing copy, select high contrast retention filter, the value is about 10.0.

③ chooses to apply the image, and the blending mode is changed to overlay. (the target is the currently selected channel. The source is the channel to be mixed with the target, which is also the blue copy. This step is equivalent to having 2 blue copies, one up and down blending mode is superimposed, and the final effect replaces the existing blue copy)

④, repeat step 3.

⑤ chooses to apply the image, the rest remains the same, the blending mode is changed to linear dodge (add), and the opacity is about 65%.

In this way, ⑥ separates spots from smooth skin. In the blue copy, black is the spot and white is the smooth skin.

02. Highlight the spot area ① invert the blue copy, load it into the selection, and select all the spots.

② click on the RGB channel, go back to the layers panel, create a curve adjustment layer, and pull the curve up a little bit, about half a grid. Operate according to the actual situation. This is a magical scene, the color spot is gone, the whole skin becomes very smooth.

③ but the facial features are also very blurred, don't worry, go to the curve mask, use the black softening pen, wipe back the eyes, eyebrows, nostrils, lips, ears, hair.

④ skinning to the last step is completed, followed by some retouching, sharpening, not much detail here. The great task has been completed.

Conclusion: there are many methods of channel skinning, the basic principle is the same, the difference is the method of separating color spots, some are through the calculation of images, some need to use a lot of filters, as long as you understand its truth. When separating spots, filters and blending modes are used to enhance the contrast.

This article is from the official account of Wechat: photography Research Society (ID:shoujiPhotography), by Zhang Xiaozhang.

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