Apple Keynote Guide de l'utilisateur télécharger pdf (Page 78)

To learn more about reducing the size of movie les, see “Reducing the Size of Media

Files” on page 111 .

Note: After you’ve reduced the size of masked or shrunk image les, you won’t be able

to restore them to their original size. If you later want to restore their original size, you

must add the original image les to the document again.

Images used in image lls or with action builds cannot be reduced in this way. Some

types of image les also may not be reducible.

Removing the Background or Unwanted Elements from an Image

The Instant Alpha tool enables you to make parts of an image transparent in order to

remove the image background.

You’ll get the best results removing solid colors with clear boundaries around them. To

remove areas that are less distinct, select a smaller area and repeat the process.

To remove unwanted elements:

1 Select the image.

2 Click Alpha in the toolbar (or choose Format > Instant Alpha).

3 Click the color you want to make transparent, and then drag slowly over it.

Dragging selects the contiguous

area that uses colors similar to

the color you click.

As you drag, the selection grows to include the contiguous area that uses similar

colors. You can control how much of the image is selected by dragging less or more.

If you hold down the Option key while you drag, all instances of the color that you’re

dragging over will be removed from the image.

78 Chapter 5 Working with Images, Shapes, and Other Objects

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Apple Keynote Guide de l'utilisateur Page 78