I don't really get this. All someone would need to do is the .htaccess method if they want to leave a cookie. Hell, the image doesn't even have to be dynamic. I can see why you'd want to get rid of the "bad" ones (such as ones leaving cookies and such) but innocent dynamic images (such as ones with their board's stats, or a countdown like mine) aren't doing any more harm than a normal .gif would. Even if the PHP script logged some data, it would be no more than can be harvested from a normal .gif images and some stats programs.
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