title: image crop with php
body: <p>I want to crop <code>30px</code> from an image only from the bottom of it. I did some search and find some  stuff, but when I tried it and save the image, the image got saved all black and I am not sure even if the image got cropped. I don't want to go back to the code that I have right now. So what is the fastest and easiest way to crop an image ?</p>