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The GD library is a library of functions written (I think) in C that allow images to be quickly and easily generated programmatically, that is it allows you to create a blank image and draw into it, alter existing images, resize them etc. It has bindings for a number of languages including php. I've used it in the past for automatic thumbnail image generation in a photo gallery, and also recently for a phpBB MOD that allows users to scribble in a java applet and then have their scribbles (or diagrams/math formulae/handwriting) displayed in their forum posts.
As far as I know it can be added to a php installation by adding it as a compile option or by bolting it on using CGI. I've never installed it myself but most hosts have it running anyway.
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