Apple ColorLaserWriter 12/600PS - Manual (Page 207)

PostScript
Click the PostScript tab to display the PostScript tab dialog box, which
controls color printing, the communication protocol, and PostScript Level 2
features.
The PostScript tab dialog box lets you set the following options:
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Use PostScript Level 2 features Tells the driver to use PostScript Level 2
features when printing documents. Use the Level 2 features to speed
printing.
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Send Data in Binary Tells the driver to send data to the printer in a binary
format. Sending data in binary format may improve the printer’s
performance when printing images or documents containing many
downloadable fonts. The Color LaserWriter 12/600 PS printer can always
receive data in either ASCII or binary format.
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Send Full Color Data Tells the driver to print colors on a color printer. Usually
it is best to select this option even when printing to a non-color printer.
Colors print in finer shades of gray.
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Match Colors Across Printers Tells the driver to save color-matching
information with the data for use later when the document is saved to a file
for printing on a different PostScript Level 2 printer.
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