Apple DVD Studio Pro 4 - Manual (Page 119)

The asset matte movie needs to be monochrome, with white identifying the asset movie
video to use, and black identifying the places where the start or end frame video appears.
You can also use levels in between white and black to set a transparency and add soft
edges.
Background Matte Movie
The background matte movie can be used in one of two different ways:
• It can be used in conjunction with the asset movie to control which areas of the screen
should show the start frame video and which should show the end frame video.
• It can be used as the only movie in the transition assets folder to provide a wipe
transition. As when used with the asset movie, the background matte movie controls
which areas of the screen should show the start frame video and which should show
the end frame video.
The background matte movie must have the same name as the transition asset folder,
followed by “-backgroundMatte” and can have an extension. For example, if the transition
asset folder’s name is Spinning DVD, the background matte movie could be named
Spinning DVD-backgroundMatte.mov.
The white areas define
where the start frame
background video
appears.
The black areas define
where the end frame
background video
appears.
The background matte movie needs to be monochrome, with white identifying where
the start frame video appears, and black identifying where the end frame video appears.
As a general rule, the background matte movie should start with a full white screen and
end with a full black screen. You can also use levels in between white and black to set a
transparency and add soft edges.
About Alpha Transition Durations
The asset movie (if present) or the background matte movie (if the asset movie is not
present) determine the default duration of the Alpha Transition. When configuring the
transition in DVD Studio Pro, you are able to set the duration from one half the default
(but not less than one second) to twice the default duration.
119 Chapter 8 Preparing Alpha Transitions