rotating PNG image leaves white border

[Raymon]

ImageMagick 6.8.1-0
CentOS 5.8
Perl

Hi, I have an image that I want to rotate 360 degrees saving an image each 5 degrees. I use the following command:

convert image.png -rotate $i -transparent none -background none image$1.png

This does remove the background (or white square) when rotating but it still leaves me with a thin white border. Any idea how I can get rid of this?

Many thanks.

[fmw42]

please post a link to your input and output example so we can see. or try adding -virtual-pixel none