Frequency separation is a powerful way to retouch a portrait inside of Adobe Photoshop. Using frequency separation, we can create smooth beautiful skin by dividing the components of your subject’s face up into two separate layers.
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As you can see in this video tutorial, we are going to separate the underlying colors of your model’s face from their skin’s surface details. Their skin colors are considered “low frequency information” and their skin’s texture–the pores, lines, eyebrows, and other elements that give our face definition–are considered high frequency information.
Once we have these two elements of the face divided up into separate layers inside of Adobe Photoshop, you can work on the skin’s color without affecting skin’s surface details or vice versa. It is much easier to smooth out color variations under someones eyes, for example, when you don’t have to worry about loosing the skin’s surface texture.