Are you using PHP (or libGD) to generate PNG images?  Are you having problems getting your text anti-aliased, and also having your “transparent” colour recognised as transparent?  Well, I had that problem too.  libGD, the component which PHP uses to handle image operations, gives you a choice: you can have anti-aliased text, or a designated colour as transparent… but not both.  Here’s why, and what you can do about it.

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