Epson AcuLaser C1900 Reference Manual page 114

Follow these steps to customize your print settings.
1. Click the Advanced radio button on the Basic Settings dialog
box, then click More Settings. The following dialog box
appears.
2. Choose Color or Black as the Color setting.
3. Choose desired printing resolution from Fast (300 dpi) or Fine
(600 dpi), then make other settings. For details on each setting,
see the
4. Click OK to apply your settings and return to the Basic
Settings tab. Click Cancel to return to the Basic Settings dialog
box without applying your settings.
Saving your settings
To save your custom settings, select the Advanced radio button
and click Save Settings on the Basic Settings dialog box. The
Custom Settings dialog box appears.
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Using the Printer Software with Macintosh
button.