Epson Stylus PHOTO 950 User Manual page 232

2. To use an image file as a watermark, click the Add PICT
button. Specify the desired image file, then click Open.
To create a text-based watermark, click the Add Text button.
Type the text in the Text box, select a font and a text style, then
click OK.
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Using the Printer Software for Macintosh