Jesper de Jong wrote:

>Is Gaussian blur not a standard algorithm that has a well-defined meaning
>for the radius? See for example http://en.wikipedia.org/wiki/Gaussian_blur

The answer is no, there is not a single well-defined meaning.  From
a mathematician's point of view, the equation contains an "r" parameter
which it is natural to call the radius, but if you use that value, it
will look to a user like the blur extends considerably farther outward.
GIMP instead tries to use a scale such that the blur appears to a user 
to extend for approximately the specified distance.  This is a matter of
judgement, but the usage is consistent and seems to come close to matching
people's intuition, as far as I can tell.

  -- Bill
 

 
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