The implemented algorithm is a simple box blur separated into
horizontal and vertical passes. The package also allows for
scaling of the image prior to blurring, in order to use bilinear
filtering during scaling to accentuate the blur effect. The following
image shows a blur of size 1.0
but with the image scaled to 0.5
times its original size, the blur applied, and then the
image scaled back up to the original size again with bilinear
filtering: