This Photoshop guide explains frequency separation, a non-destructive method for separating texture from color and tone. It covers Gaussian Blur, Apply Image, Linear Light, layer tools, blur-radius choices, and practical retouching for skin, portraits, products and jewelry. The guide explains how to diagnose halos, smudging and tone issues. See the article for details. https://clippingexpertasia.com/blog/frequency-separation-retouching/