he he... he he... ;-)
I'm using imagemagik instead gd, so I'm not sure, but I guess you have to check your codes since it should auto detected and applied. Better go w/ imagemagik for more powerful tasks, and you have to install on your own, but don't be so care since it's very simple, easy and the it takes 5 min or less for the whole installation and setup.
Have fun,
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www.jlbn.net]