Epson Stylus Pro 7800 User Manual page 172

Use these settings to experiment with new printing ideas or to
fine-tune a range of printer settings to meet your individual
needs. Once you are satisfied with your new settings, you can add
them to the Custom Setting list in the Print dialog.
Color Controls
Select this setting to use the color matching and adjustment
methods provided with the printer. Click the triangle next to the
Advanced Settings to see details.
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Printing with Mac OS X