Quote:
They are just RENAMED to GIFs or are they converted to GIFs?
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There is no "conversion" from one type to another. The data is stored as binary, and when "displayed" using avatar.php, it adds
Code:
header("Content-type: image/gif");
so your browser will believe it's a gif file. The contents of your jpg are unchanged, just sent to the browser as image/gif so it can be displayed.