Designing Interactive PDF Documents in Adobe InDesign
As we move away from the days when the printed version of a document was always the definitive one, Adobe’s PDF format becomes more and more important. InDesign allows you to create PDF documents; you don’t need a separate copy of Acrobat for this purpose. In addition to creating the PDF, InDesign also allows you to make it interactive, thus enhancing the user experience of anyone who opens it. To ensure that the various interactive features are included in the PDF, you must activate the “Interactive Elements” option in the Export PDF dialog box.
There are five main types of interactivity which InDesign allows you to add to your PDFs: bookmarks, links, buttons, video and transitions. When viewing a PDF file in Acrobat or Acrobat Reader, bookmarks are normally displayed in a panel on the left of your screen; clicking a bookmark takes you to the page to which the bookmark relates. Links and buttons are hotspots which, when clicked, instigate an action of some sort, such as opening a web URL. QuickTime video can now be embedded in a PDF file and transitions are useful when you want to create PDFs that can be viewed in a similar way to PowerPoint presentations.
Bookmarks are normally generated automatically in InDesign and are linked to the table of contents feature. The table of contents definition window includes an option for creating bookmarks. If this is activated, InDesign will automatically create a bookmark corresponding to each item in the table of contents pointing to the appropriate page.
Links can also be automatically generated via the table of contents feature. Each table of contents entry will automatically turn into a clickable link which will take the user to the corresponding page. As well as this, InDesign has a button tool which allows you to create a button on any part of a page. Using the Button Options command, you can then choose what happens when the button is clicked. Thus, for example, you could create a button hotspot over your company logo and specify that, when clicked, it will take the user to your company website.
Video clips are brought into InDesign using the Place command in the File menu. The only video format allowed is QuickTime. Once the video clip has been positioned, you can right-click on it and choose Movie Options. Here, you can specify when the movie will play, whether it is embedded in the PDF file or referenced externally and whether the QuickTime controller bar will be visible.
The Transitions panel is a new feature in InDesign CS4 and allows you to associate transitions with all pages or selected pages within the document. Simply select a series of pages and then choose the desired transition. To apply a transition to all pages, choose the option Apply To All Spreads.
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