Previewing Any Key
In the Transparency Settings dialog box, a sample image helps you analyze the effectiveness of the key. However, previewing the keyed image against the background image isn’t always the best way to evaluate your settings. It can be difficult to discern pixels and identify transparent areas. For this reason, the preview includes several options to make your adjustments easier to perform.
To preview any key type:
1. | In the Transparency Settings dialog box, choose how you want to preview the key by clicking one of the icons below the sample frame:
Black/White  — to fill the transparent areas of a clip with black; click it again ... |
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