When
you print to a PostScript or PDF file, Illustrator automatically
selects the PostScript level of your output device. If you want
to change the Postscript level or data format for PostScript files,
do the following:
Choose File > Print.
For Printer, select Adobe PostScript® File
or Adobe PDF.
Select Graphics on the left side of the Print dialog
box.
For PostScript, select the level of compatibility with
the interpreters in PostScript output devices.
Level 2 improves the printing speed and output quality
of graphics printed on a PostScript Level 2 or greater output device.
Level 3 provides the best speed and output quality on a PostScript
3 device.
(Optional) If you chose Adobe PostScript® File
as the printer, select a Data Format option to specify how Illustrator
sends the image data from your computer to a printer.
Binary exports the image data as binary code, which is
more compact than ASCII but may not be compatible with all systems.
ASCII exports the image data as ASCII text, which is compatible
with older networks and parallel printers and is usually the best
choice for graphics used on multiple platforms. It is also usually the
best choice for documents used only on Mac OS systems.