  (please follow the link above) and one is for the "filter list". The filter list controls how the
        individual objects in a PDF file are encoded. By default, all objects get "flate" encoded (i.e. simply 
        compressed with the same algorithm that is also used in ZIP files). Most users don't need to change that
        setting. For debugging purposes, it may be desired not to compress the internal objects at all so the
        generated PDF commands can be read. In that case, you can simply use 