Gaussian Blur
Creates a soft blur effect. The Gaussian blur is the softest blur effect you can apply and is a frequently used blur effect. By default, this filter affects the image uniformly, although you can control the amount of horizontal and vertical blur independently.
Gaussian Blur is relevant for most motion graphics tasks. You can animate it to create focus-control effects. However, to more accurately simulate camera focus, use the Defocus filter.
Adjust this filter using the parameter controls in the Filters Inspector:
Amount: Sets the radius of the blur.
Horizontal: Sets the percentage of the Amount parameter applied in the horizontal direction.
Vertical: Sets the percentage of the Amount parameter applied in the vertical direction.
Crop: Sets whether the filtered image is sharply cropped at its original boundaries. When this checkbox is deselected, the filter affects the edges of the image.
Mix: Sets the percentage of the original image to be blended with the blurred image.