A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 4: Plug-in 20 - Image Watermark

In a similar way to creating GIF images of text, you can also overlay text on an existing image to create watermarks. With the amount of copying and pasting of images across the web, when you have one you would like to protect, sometimes watermarking is the best way, and this plug-in provides a variety of options.

The Figure shows a photograph with the word Watermark overlaid in white at a transparency setting of 10%.