Apple Keynote '08 - Manual (Page 172)

172 Chapter 9 Viewing, Printing, and Exporting Your Slideshow
4 If you use the Cube or Flip transition, make sure to select “Reduce Flip transitions to
avoid clipping” or “Reduce Cube transitions to avoid clipping.” Otherwise, part of the
transition may not be visible.
Configuring Video Random Access Memory (VRAM)
Make sure your computer has adequate VRAM so that transition animations and
complex object builds play correctly. VRAM is a special area of memory on your
computer’s video card.
Keynote requires a minimum of 8 MB of VRAM to play transitions. For more complex
animations, such as some object builds, a minimum of 32 MB of VRAM is
recommended.
You can find out how much VRAM you have by using Apple System Profiler, located in
Applications/Utilities. Open Apple System Profiler, click PCI/AGP Cards, and click the
disclosure triangle next to your video card. If your computer has fewer than 32 MB of
VRAM and your slideshow plays poorly, there are several things you can try.
Here are ways to compensate for inadequate VRAM:
m Turn on video mirroring (see “Tips for Using an External Display” on page 168). This
setup uses less VRAM and may be required for playback at higher resolutions. (When
you use video mirroring, one of the two displays may show choppiness or “tearing” in
the video playback. See “Setting the Screen Refresh Rate” on page 171 for more
information.)
m Set your displays to lower resolutions in the Displays pane of System Preferences. Lower
screen resolutions use less VRAM.
m Set your displays to use fewer colors in the Displays pane of System Preferences. Using
Thousands instead of Millions uses less VRAM.
Even with 32 MB or more of VRAM, you may still see choppiness at very high screen
resolutions when building large objects with several parts (for example, if you build a
full-screen chart at a screen resolution of 1280 x 1024).
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. For
more information, see Mac Help or the documentation that came with your computer.