How to pad an image with some white pixels?

[Peng Yu]

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!

[Fred Weinhaus]

convert image -bordercolor white -border 10 resultimage

or

convert image -background white -gravity center -extent WxH resultimage


see
http://www.imagemagick.org/Usage/crop/#border
http://www.imagemagick.org/Usage/crop/#extent

Post by Peng Yu
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!