This should do the trick.
http://codex.wordpress.org/Function_Reference/add_image_size
just create your own image size you want to best fit your website.
you could then use this plugin to regenerate all your thumbnails.
This should do the trick.
http://codex.wordpress.org/Function_Reference/add_image_size
just create your own image size you want to best fit your website.
you could then use this plugin to regenerate all your thumbnails.