How to round the corners of image via Image manipulation code

[eluser]eshban[/eluser]
Hi,

I am using Codeigniter Image Manipulation Class. I need to ask that whether codeigniter supports, to round the corners of images while cropping it.

I need exactly this format of image
http://www.roundpic.com/img/what.gif

Please guide me that how to implement this with codeigniter

Regards,
Eshban