Retouching – Frequency Separation
Frequency separation is a technique used in retouching photographs that allows you to work on the color separate from the texture detail. What this means is that you can adjust the blotchiness or overall tonality of a patch of skin, for example, without losing the texture of that skin.
Essentially we create a High layer that has the detail elements, and a Low layer that handles the color. We can then bring in tools like the clone stamp, the Spot Healing Brush, and the Brush tool to affect each aspect of the image separately.
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