how to create a frayed border of an bitmap?

[Holger]

Hello,
I would like to get a special border effect on my image. It should get a kind of frayed border.
With one of my filters, I can get such effect, but only with included white background. But I need it without background, just like if cropped.
Is there any way to get that effect?
(I use version Designer 7, but try out ver. 9 now)

Thanks for helping me!

Holger