or if you only need to get a few borders done, my lazy approach would be to open in photoshop, select the white negative space & crop it for reuse.. I would rather learn the cool stuff that following these links would lead to... but sad to say, maybe there is some truth to that "old dogs/new tricks" saying... even though it is often penny wise & pound foolish, I've noticed myself being lazy about learning the fast way if the slow way is still faster then learning...