Image Compression?

[leefish]

Sorry to bring this thread back from the dead - but I also have a question about images compression. I was reading that it is preferred to use progressive.jpgs over baseline and that the  http://www.php.net/manual/en/function.im...http://www.php.net/manual/en/function.imageint  is required. Is this included in the XThreads Image Filtering Chains? I could find no reference to it in the Documentation.