Apple Keynote '09 - Manual (Page 207)

Chapter 11 Viewing, Printing, and Exporting Your Slideshow 207
Set the native screen resolution (the size of the image on the screen) in the Displays m
pane of System Preferences. Look for this information in the documentation that came
with the display. For most projectors, the preferred screen resolution is 800 x 600 or
1024 x 768. Most liquid-crystal display (LCD) and Digital Light Processing (DLP) screens
work with a variety of resolutions, but one is the preferred setting.
To change your computer’s screen resolution, choose Apple menu > System
Preferences, click Displays, click Display, and then select the resolution you want from
the Resolutions list.
Set the screen refresh rate (the number of times per second that images are updated
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on your screen) in the Displays pane of System Preferences. If you use an LCD display,
LCD projector, or DLP projector, try to match the refresh rate of your computer or video
card with the optimal refresh rate of the display device. (Usually this is an issue only
if you’re using a VGA-style connection to an LCD or DLP display. CRT devices do not
typically have one optimal refresh rate.)
If the colors on your display seem “washed out” when you connect to a new projector
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or if the text appears jagged, you may need to calibrate your display. Open ColorSync
Utility (in the Utilities folder in the Applications folder on your hard disk) to set up
color calibration.
If you’re set up to use a dual-display configuration and you want to switch the Presenter
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Display to the other screen during your slideshow, press X to toggle the displays.
About Controlling Presentations
If your presentation isn’t self-playing, you can use the keyboard to pause and resume
slideshows and to navigate among slides. And you can set up the presenter’s display to
show the next slide, elapsed time, and more. If your Mac came with an Apple Remote,
you can use it to control a presentation.