HSL Select (free)

Simple and very useful node which for some reason doesn't exist in SD by default.
Get for free https://cg-ammo.gumroad.com/l/HSL_Select (Change $1 to $0 to get for free)
or make it by yourself by tutorial on screenshots.
Creates a grayscale gradation mask of each value (Hue/Saturation/Luminance) - allows you to make correct clamping (default one sucks and is shifting colors) or change specific values on your textures.