https://www.sharkpixel.com/frequency-separation

Master the advanced Photoshop frequency separation technique to elevate your photos. Frequency separation is the most important Photoshop technique to learn as it is instrumental in understanding color, texture and how the two interact in your photographs. I’m going to shed light on the concept behind frequency separation, why we use it, how we use it, and its infinite applications from smoothing skin realistically to effortlessly removing clothing wrinkles on garments.