Frequency Separation Skin Retouching
Frequency separation is the technique that separates a portrait into two layers: one carrying tone and color, one carrying texture and detail. Once split, you can smooth uneven skin tones on the bottom layer without erasing pores, hair, or fine detail on the top layer. The result is skin that looks retouched instead of plastic.
This tutorial sets up frequency separation manually so you understand what each step is doing. Once you get it, save the steps as a Photoshop action and you will never set it up by hand again.
Setting up the layers
Step 1: Duplicate the base layer twice
Press Ctrl/Cmd + J twice to duplicate your base layer. Rename the bottom copy Low Frequency and the top copy High Frequency. Hide the High Frequency layer for now.
Step 2: Blur the Low Frequency layer
Select Low Frequency. Go to Filter > Blur > Gaussian Blur. Set the radius to a value where the skin tones blur out but the major facial features (eyes, mouth) are still recognizable. For a typical portrait shot at 4000 pixels wide, this is around 8-12 pixels. Click OK.
Don't have Photoshop yet? Try free for 7 days
Frequency separation needs Photoshop's full layer model and Apply Image command. Photopea handles it, but Photoshop is the industry-standard.
Coming soonStep 3: Show High Frequency and run Apply Image
Show the High Frequency layer and select it. Go to Image > Apply Image. In the dialog: Layer = Low Frequency, Blending = Subtract, Scale = 2, Offset = 128. Click OK.
The High Frequency layer now looks gray with faint outlines of pores and texture. That gray sheet IS the high-frequency detail of the photo, isolated.
Step 4: Set High Frequency blend mode to Linear Light
With High Frequency selected, change the blend mode at the top of the Layers panel from Normal to Linear Light. The image snaps back to its original appearance. The texture from High is now sitting on top of the smooth tones from Low.
Retouching the layers
Step 5: Smooth uneven tones on the Low Frequency layer
Select the Low Frequency layer. Grab the Mixer Brush (B, then cycle to Mixer Brush). Set Wet to about 30%, Load to 30%, Mix to 30%. Paint over uneven skin areas. The Mixer Brush samples nearby tones and blends them together. Because you are working on Low Frequency, only the underlying color smooths; pores stay sharp because they live on the High Frequency layer above.
Step 6: Spot-clean the High Frequency layer
Switch to High Frequency. Use the Healing Brush (J) on individual blemishes, stray hairs, and skin imperfections. Sample a clean area of similar texture and click on the blemish. Because the layer is texture-only, your healing fixes only that detail and does not muddy the skin tone underneath.
Pro tip: save this as an action
Once you have set up frequency separation by hand twice, record the exact steps as a Photoshop action (Window > Actions, click the New Action button, repeat the setup, click Stop). Future portraits get frequency separation in one button press.
What frequency separation is not
Frequency separation is for fine retouching. Do not use it to fundamentally reshape a face or change someone's appearance. Used correctly, viewers cannot tell a photo was retouched. Used heavily, it produces the over-smoothed plastic look that ruined a decade of magazine covers.
The advanced retouching course we recommend
Skillshare and Domestika both have courses dedicated to professional skin retouching, dodge-and-burn, and color grading workflows.
Coming soonRelated tutorials
Get the Photoshop shortcuts cheat sheet
Every shortcut you'll actually use, on a single printable page.