Styles can automate the formatting of individual objects, but you can also apply overall themes to the entire presentation to change all of the formatting at once. A theme is a set of formatting specifications that are applied to objects and text consistently throughout the presentation (except in cases where an object has manual formatting applied that overrides the theme).

There are three elements to a theme: the colors, the fonts, and the effects. Colors are applied via a set of placeholders, as they were in PowerPoint 2003, but now you can apply tints or shades of a color much more easily.

Whenever you open a list or menu that contains a color picker, you select from a palette like the one in Figure 20-4. The top row contains swatches for the colors in the current theme, and beneath them are various tints (lighter versions) and shades (darker versions) of the colors. By applying theme colors instead of fixed colors, you enable objects to change color automatically when you switch to a different theme.

FIGURE 20-3
WordArt can now be applied to regular text, including slide titles.

FIGURE 20-4
Choose colors for text and graphic objects from a color picker that focuses on theme-based color choices.

Font themes apply one font for headings and another for body text. In PowerPoint 2007 it is usually best not to apply a specific font to any text, but instead to apply either (Body) or (Heading) to it. Then you can let the font theme dictate the font choices, so that they will update automatically when you chose a different theme.

On the Font drop-down list, the top choices are now (Body) and (Heading). The font listed next to them is the font that happens to be applied with the current theme.

Effect themes apply shadows and 3-D effects to graphic objects. PowerPoint 2007’s new gallery of effects are impressive, and can make plain lines and shapes appear to pop off the screen with textures that simulate glass, metal, or other surfaces.

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