ArcSoft SHOWBIZ 2 - Manual (Page 42)

Chapter 4: Create
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4.2 Themes
The Themes tab is where you add background images to your
projects. Themes are albums of categorized images that can be
used as menu backgrounds for your DVD.
From the pull-down, select the category you want. You can then
choose the exact menu background. Double-click it to add it as
the background for the current menu. You can have a different
background for each submenu or menu page.
To create your own album of themes, select "< New Theme >"
from the pull-down.
To add a theme to an album, click the New Background button in
the preview area. Once you've selected the image, click the Save
As Theme button to save the theme in the album of your choice.
To delete a custom theme, right-click it and select "Delete."