How to pad an image with some white pixels?

Peng Yu <[email protected]> Sat, 19 Nov 2011 22:30:26 -0600

Newsgroups	gmane.comp.video.image-magick.user
Message-ID	<CABrM6wmQbG+XzfAoKaL=X4h4UMP4oRs_-nQNoJPHKtY6zEHQ5w@mail.gmail.com>

Hi,

I see -crop that can cut an image. I'm wondering how to expand an
image by padding with some background color (e.g. white) pixels. Could
anybody let me know? Thanks!

-- 
Regards,
Peng