Apple Keynote 2 - Manual (Page 51)

Chapter 3 Working With Text, Graphics, and Other Media 51
You can also use alpha-channel graphics to create transparency around an irregularly
shaped image, like a tree, so that the image doesn’t have a rectangular white area
around it.
To place an image behind a photo cutout window in a Keynote theme:
1 Drag your image from the Media Browser or the Finder to a cutout window on the
slide canvas.
2 To resize the image within the cutout, drag one of the selection handles.
3 Drag the image to adjust its position in the window.
Importing Alpha-Channel Graphics Into Keynote
When you bring an alpha-channel image into Keynote, there’s nothing else you have
to do to make the transparency work. Just place it, manipulate it, and move it to the
back or front as you would any other image.
Many PDF, TIFF, and PSD files contain alpha-channel graphics. You can use various
applications to create alpha-channel images, including Adobe Photoshop, Corel Draw,
Adobe Illustrator, and Adobe Acrobat. See the instructions that come with the
application to learn how to create alpha-channel images. To learn how to create your
own frame in Keynote with an imported alpha-channel graphic, see “Layering
Background Objects and Objects on Slides” on page 132.
Your photograph is placed
behind the alpha-channel
graphic and can be seen
through its transparent
region, so it appears that
the photo is in the photo-
corner frame.
This textured foreground
with photo corners and a
white border is an alpha-
channel graphic. The area
between the photo
corners is a transparent
alpha channel.