Keynote - Reducing the Size of Media Files

background image

Reducing the Size of Media Files

Including large sound and movie files to your Keynote document can make the entire
document file size very large. If you’re using only a portion of the sound or movie file
in your slideshow, you can remove the unused portions of the audio or video file to
make the Keynote document file smaller. You can choose either to reduce the size of
individual media files or to reduce the size of all the media files in the document that
are not being used in full (including masked or resized image files).

Before you reduce the movie or audio files, you must save them as part of your
document. For details about how to do this, see “Saving a Presentation” on page 31.

To reduce the file size of your document, do either of the following:


To reduce the size of an individual file in your document, select a sound or movie file for
which you have set the Start and Stop sliders to exclude some part of the file, or an
image file that you have masked or resized to a smaller size, and then choose Format >
Image > Reduce Media File Size.


To reduce the size of all the media files in your document, make sure no sound, movie, or
image file is selected, and then choose File > Reduce File Size.

After reducing the size of your sound or video file, you won’t be able to restore the
file to its original length or listen to or view the parts that you have excluded. If you’ve
reduced the size of a masked or resized image file, you won’t be able to restore the
image to a larger size without losing some image quality.

If you change your mind and later want to restore the entire file, you must add the file
to your slide again.

Some types of movie files may not be reducible in this way.

background image


Slide transitions and object builds can create visual interest

for your slideshow and add emphasis to your points. Keynote

provides a variety of sharp and novel transition and build

effects to help you create a dynamic presentation.

After you’ve created and organized your slides, you can add animated effects that play
between slides and move objects on slides. There are three basic types of animation
you can use in your slideshow:


Transitions provide visual effects when you move from one slide to the next.


Object builds (or build effects) move objects on and off slides (the objects appear
and disappear).


Object actions animate objects within a slide by causing them to move, rotate,
change size, or change opacity.