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Instead of Animation
Because online slideshows use JPEG image files, animations aren’t possible. In particular, PowerPoint build effects can’t be used. These are used where one line of text appears each time the presenter clicks the slide advance button. They are very useful because audiences tend to read everything on a slide before they listen to the speaker, so by controlling what’s on the screen, a canny slideshow presenter can ensure the audience is focused on them, not the slides.
You can get around such problems by splitting one slide into several, each slide containing one extra line of text. As the viewer advances through an online slideshow built this way, each line of text will appear just as if a PowerPoint build effect was being used. It’s quickest to create the slide with all the bullet points first, duplicate it a few times, and then remove one or more lines of text from the duplicates (see Figure 6). Then rearrange the slides, so the slide with one line of text comes first, the slide with two lines of text next, and so on. The good thing about this approach is that while the grey-shaded lines of text aren’t obtrusive, they’re still available to the viewer should he or she need reminding.
Incidentally, the same trick can be used in many other situations—for example, where bar charts need to be revealed one bar at a time.
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Figure 6 Build-effects can be mimicked by using a series of slides, each with one additional line of text.