### Frequency separation retouching in Photoshop

Duplicate the layer twice. Perform these in each layer:

#### Lower layer

- Apply Gaussian Blur

#### Upper layer

- Set layer mask to Linear light
- Image → Apply Image
  - Layer: (select the lower layer)
  - Blending mode: `Subtract`
  - Scale: `2`
  - Offset: `128`

### Reference

- https://phlearn.com/amazing-power-frequency-separation-retouching-photoshop

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