Epson AcuLaser C3800N Series User Manual page 122

EPSON AcuLaser C3800 User's Guide
To make a bitmap watermark
Before making a custom watermark, you should prepare a bitmap (PICT) file.
For Mac OS X users
1. Open the Print dialog box.
2. Select Printer Settings from the drop-down list, and select the Basic Settings tab.
3. Click Stamp Function.
4. Select the Watermark check box, then click Watermark Settings.
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Using the Printer Software with Macintosh