Sure, unless of course, the image happens to be a .gif image, in which case you'll need to patch the stock GD to add that capability back in.

Note: This path is NOT recommended due to the restrictive licensing and moral issues associated with using .gif images, and circumventing that license by patching GD to restore the capability that was removed due to it.

In short, use the ImageMagick Perl API to do the conversions and resizing you need.