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gaussian blurring for images

first of all, thanks to all those who have been responding to my questions
with solutions that WORK!  

now i'm looking for an image processing routine so i don't have to write
it myself.  i want to apply a 3-d gaussian blurring filter to a 3-d image,
so that i can decimate the image without introducing aliasing. 

does anybody out there have such a beast?  

david mattes