Use
            the RGB Blur node to apply a Gaussian blur to colour images. You can
               add an RGB Blur node to any part of the pipeline except to the Front
               and Matte pipes of MBlend nodes and the Matte pipes of CBlend nodes. To
            blur a matte, use the Blur filter in the Edge node. Both the RGB
            and Edge node blurs are Gaussian.
         
         NoteUsing this node before
               the MBlend node on the Matte branch is the equivalent of the KeyIn
               Filter in the traditional Keyer.
            
         You can animate a blur
            using the Channel Editor.
         
         To blur a colour image:
         
         
            - Place the RGB Blur node at the appropriate
               point in the pipeline. See 
                        Adding Nodes to the Pipeline.
            
- In Move mode, click the RGB Blur node
               to display the RGB Blur menu.
            
- If you want the image to be equally blurred
               horizontally and vertically, click Proportional to enable a proportional
               blur.
            
- Set the width and height of the blur.
               When Proportional is enabled, enter a value in either field. The
               higher the number, the greater the blur.
               NoteIncreasing the blur
                     increases the processing time.