When used correctly, frequency separation can be a very powerful and efficient tool for editing your portraits. This great video tutorial will show you a straightforward method to use frequency separation in your portrait retouching.
Coming to you from Miguel Quiles, this helpful tutorial will show you how to use frequency separation in Photoshop to edit portraits. The beauty of frequency separation is that it takes advantage of the Fourier Transform to separate the texture data from the color and luminance data of an image. This allows you to work on things like evening skin tone independently of fixing blemishes. It's quite versatile; for example, I often use it to even out wrinkles in the subject's clothing. That being said, frequency separation has a bit of a controversial reputation, as it tends to get overused and misused a bit, often leading to very plastic and overly edited portraits. It's particularly important with such efficient and powerful methods to use them in moderation. In particular, be sure to step away from the photo when you're finished editing and come back to it with a fresh pair of eyes after a few minutes. Check out the video above for the full rundown.