Blur
The Blur component blurs the image provided by the Source input using either the Gaussian or the box blur algorithm. This is a map component, it can be located in the Processing category on the Components Bar. Blur is a bitmap-based component – in order to produce the output image, it renders a bitmap version of the source image. Using bitmap-based components in a filter can increase its rendering time, and, in some cases, degrade the quality of the final image, so Blur should be used only when necessary.
Provides the source image to be blurred. This is a required input – in order to make Blur work, this input must be connected.
Sets the blur radius. Larger values lead to stronger blurring and slower rendering. Radius is measured as a percentage of the global parameter Size. For example, if Size is set to 600 pixels, and Radius is set to 10, the actual blur radius will be 60 pixels.
Defines the blur algorithm. When turned on, a Gaussian blur is performed. Gaussian blur is slower but smoother and produces isotropic results with no directional artifacts (or 'streaks'). When this parameter is turned off, a simple blur (known as 'box blur') is performed. Box blur is faster but is not as smooth as Gaussian – it has directional artifacts.