Epson Stylus Color 670 Manual page 52

To add a watermark, click the Add/Del button. The following
dialog box appears.
Creating an image-based watermark:
1. Select BMP.
2. Click the Browse button to specify the bitmap file you want
to use, then click OK.
3. Type a name for your watermark in the Name box, then click
Save.
4. Click OK to return to the Layout menu.
Creating a text-based watermark:
1. Select Text.
2. Type your text in the Text box. The text that you enter will
also be assigned to the watermark as a watermark name.
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Using the Printer Software for Windows