Apple Final Cut Express HD - Manual (Page 800)

800 Part IX Effects
To change the alpha channel type of a clip using the Item Properties window:
1 Do one of the following:
 Select a clip in the Browser, then choose Edit > Item Properties.
 Control-click a clip in the Browser, then choose Item Properties from the shortcut menu.
 Select your clip, then press Command-9.
The Item Properties window appears.
2 Control-click the Alpha row in the Clip column, then choose the alpha channel type
from the shortcut menu.
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Tip: If necessary, you can also Control-click the Reverse Alpha row in the Clip column
and choose No or Yes from the shortcut menu.
To change the alpha channel type of a clip using the Alpha Type menu:
1 Select a clip in the Timeline or open a clip in the Viewer.
2 Choose Modify > Alpha Type, then choose a new alpha channel type from the submenu.
To change the alpha channel type of a clip in the Browser:
m Control-click the Alpha column in the Browser, then choose a new alpha channel type
from the shortcut menu.
To reverse a clip’s alpha channel, do one of the following:
m Select a clip in the Timeline or open a clip in the Viewer, then choose
Modify > Reverse Alpha.
m In the Browser, Control-click the Reverse Alpha column next to the clip you want to
modify, then choose No or Yes from the shortcut menu.
If the Reverse Alpha menu item is checked, its alpha channel is being reversed. If it’s
unchecked, the alpha channel is left alone.