When you’re driving, your tires, shock absorbers, and suspension remove most of the harsh vibrations from the road, leaving you with a smooth ride. In surface texture analysis, filtering has much the same effect: separating larger “waviness” from finer “roughness.” The Gaussian filter acts like the perfect shock absorber in terms of separating waviness and roughness…but it does have nuances. In this video we show how the Gaussian filter works, and we share some details you need to understand in order to decide when and how to use it.