Every portrait retoucher faces the same challenge: how do you smooth skin without making it look like plastic?

The answer is frequency separation — a technique that separates your image into texture and color layers, letting you work on each independently.

The Basic Setup

  1. Duplicate your background layer twice
  2. Name the top layer “Texture” and the bottom “Color”
  3. On the Color layer, apply Gaussian Blur (radius 6-10 pixels depending on resolution)
  4. On the Texture layer, go to Image > Apply Image, select the Color layer, set blending to Subtract, Scale 2, Offset 128
  5. Set the Texture layer blend mode to Linear Light

Working the Color Layer

Select the Color layer and use a soft brush with the Mixer Brush tool (or just a regular brush at low opacity). Sample clean skin areas and paint over discoloration, redness, or uneven tones.

The beauty of this approach is that you’re only affecting color, not texture. Every pore, every hair, every natural skin detail stays intact.

Working the Texture Layer

Switch to the Texture layer for any actual blemishes — pimples, scars, stray hairs. Use the Clone Stamp or Healing Brush here. Since you’re only working with texture data, your corrections will blend seamlessly.

My Personal Settings

For a 45-megapixel image, I typically use:

  • Gaussian Blur radius: 8-12 pixels
  • Brush opacity on color layer: 15-25%
  • Multiple passes rather than one heavy stroke

The key is restraint. Do less than you think you need, then zoom out. If you can tell the image has been retouched, you’ve gone too far.

When NOT to Use Frequency Separation

This technique isn’t magic. For heavy acne or severe skin conditions, you’ll need to do targeted healing first, then use frequency separation for the final smoothing pass. And for beauty/fashion work at very high resolution, most professionals use dodge and burn instead — it gives more precise control.

Start with frequency separation for your everyday portrait work. It’s fast, effective, and once you get the muscle memory, you’ll wonder how you ever retouched without it.