"Foomatic generates filters as PostScript Printer
Descriptions (PPDs) that inform the Common UNIX Printing System
(CUPS) about specific printer capabilities. Foomatic 4.0 supports
the new CUPS enhancements. Certainly the newest aspect of Foomatic
is that it sends PDFs instead of PostScript data to printers.
Benefits include the Portable Document Format's better color
management and depth support (more than 8 bits-per-channel). PDFs
also provide better transparency, are multiplatform and involve
smaller files."