![]() ![]() However, the most useful feature is that OCGs can be turned on and off with a script, as shown in the Creating and Using Layers (OCGs) with Acrobat JavaScript article. OCGs allow page content to be turned on and off based on parameters such as the zoom level. When Acrobat creates a watermark, it places the watermark content into an OCG (optional content group), more commonly referred to as a PDF layer. This rich feature set means that the Acrobat watermarking tool can be used to add logos, overlays, backgrounds, headers, footers, special marks or any other kind of (post-creation) content to a PDF.įigure 1 – The watermarking tool provides a wealth of optionsīut there’s more. The Acrobat watermarking tool (Figure 1) allows the user to select the location, page range, opacity, scaling and many other parameters. Nearly any type of static content (text, image files and pages from another PDF) can be applied to a PDF as a watermark. The PDF watermark can be used to create the exact effect produced by the old-style watermarking, but it also has many other uses. For a PDF, the term watermark means over- or under- laying text and/or images onto a page. ![]() Since water has a very different effect on electronic equipment, a watermark on a PDF is quite different. A watermark on an old-style DTF (dead-tree-format) was literally just that, a shadowy mark on the page created by applying water to the document. ![]()
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