Grass Valley EDIUS v.5.1 User Manual
Page 561
EDIUS — User Reference Guide
561
Creating Video Composites
The clip from which the desired portions are extracted is called the “Fill.”
The transparency mask that extracts images from the fill is called the “Key”
as illustrated in
.
Figure 659. Alpha Channel Key and Fill
The Alpha Channel functions are not supported when the following
parameters are different for the Key and Fill images:
•
Image size
•
Frame rate
•
Aspect ratio
•
Field order (Top or Bottom Field First and Progressive are supported -
No combination of Top Field First and Bottom Field First is supported)
•
One or both clips has no defined duration.
Note
The aspect ratio and field order of a clip is visible in the Information Palette.
To create an Alpha Channel composite clip, follow these steps:
1.
Save the clips that will be the Fill and Key clips in the Asset Bin as
shown in
Figure 660. Fill and Key Clips in the Asset Bin
2.
Select the two clips to use as the Fill and Key
3.
Right click on the clips and select Convert>Alpha matte from the menu.
See
.