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CHP. 13 USING ADVANCED VIDEO FEATURES
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8.
Click the Compositing Mode button ( ) on the title track and choose Source Alpha if your image has an
alpha channel associated with it. If it does not, you may need to add a chroma key filter to the image and
key out the background. For more information, see Chroma keying on page 264.
Note:
The alpha channel is saved as a selection area in some
programs. If you cannot save the alpha channel, use a black
background and a mask will be created from the background.
The alpha channel of TGA images may not be detected
automatically. For more information, see Modifying media
file properties on page 239.
Fading titles
Another common technique is to fade a still title in and out. You can create this effect by using an opacity
envelope on a title event. For more information, see Using opacity envelopes on page 177.
You can also create multiple title images and then use crossfades or custom transitions between them. For
more information, see Using transition effects on page 268.
Adding closed captioning to Windows Media Video (WMV) files
Closed captioning makes your final video accessible to a wider audience. You can use text commands to add
captions line-by-line to a Windows Media
® Video (WMV) file, or for longer projects, you can add
captioning from a script.