MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH Manual page 507

Using the blur filter
The BlurFilter class lets you apply a blur visual effect to a variety of objects in Flash. A blur
effect softens the details of an image. You can produce blurs that range from creating a softly
unfocused look to a Gaussian blur, a hazy appearance like viewing an image through semi-
opaque glass. The blur filter is based on a box-pass blur filter. The parameter
quality
defines how many times the blur should be repeated (three passes approximates a Gaussian
blur filter).
The blur filter scales only when you zoom into the Stage.
For more information on this filter, see BlurFilter (flash.filters.BlurFilter) in the
ActionScript 2.0 Language Reference.
The following procedure blurs a dynamically loaded image based on the mouse pointer's
current position on the Stage. The further the pointer is from the center of the Stage, the
more the image is blurred.
Working with filters using ActionScript 507