Blur

This is a Gaussian type blur. Other blur plugins – Linear, Motion, Radial, and Zoom –are described later. This plugin is keyframable. Blur is used to blur a video track via the following parameters:

Horizontal and vertical
values are used to tell which one of the fields blurring affects; can be both.
Radius
use this dial to define the amount of blur to apply.
Alpha determines radius
use alpha to define the amount of blur to apply. (radius=gray value of alpha)
Blur alpha, red, green, blue
specifies which color channels is to be blurred.

The CINELERRA-GG Community, 2021
https://www.cinelerra-gg.org