Feather/Glow

I was wondering if anyone would have any ideas for feathering/glowing a white line, something like a lightsabre effect - but without the colour.
I've searched the forums and psc but cannot really find anything. The blurring techniques I have used so far do not work :)

Many thanks

You want to do this in code?

I have found some image processing in VB6 over here at vbAccelerator
http://www.vbaccelerator.com/home/VB/Code/vbMedia/Image_Processing/Image_Processing_Using_DIB_Sections/article.asp

Take a look at the related articles to get an idea of how this kind of image processing is done.