Frequency Separation
An advanced retouching technique that separates texture detail from color and tone, allowing independent editing of each layer.
Frequency separation splits an image into two layers: a high-frequency layer containing fine detail like skin texture, pores, and hair, and a low-frequency layer containing broad color and tonal gradients. Retouchers can smooth skin color unevenness on the low-frequency layer without destroying natural skin texture, and they can fix texture blemishes on the high-frequency layer without affecting color. This produces natural-looking skin retouching that avoids the plastic appearance caused by global blur. Professional beauty retouchers use frequency separation extensively for editorial and advertising work. The technique requires careful execution — over-smoothing the low-frequency layer creates an uncanny valley effect where skin looks too perfect.
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