To export a green screen video with an alpha channel in After Effects, follow the steps below:
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First, open the After Effects project containing the green screen footage that you want to export.
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Select the green screen footage layer in the timeline.
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Go to the “Composition” menu and choose “Add to Render Queue” or press “Ctrl+M” on your keyboard.
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In the Render Queue window, select the output module for your export. You can choose formats such as QuickTime or AVI.
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Click on the “Format Options” button to open the codec settings. In the codec settings, select “RGB + Alpha” as the channels option.
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Once you have set the output module and codec settings, choose the destination folder where you want to save the exported file.
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Finally, click the “Render” button to start exporting your green screen video with an alpha channel.
It is important to note that when exporting with an alpha channel, the resulting file size may be larger than usual. Additionally, make sure that your green screen footage has been properly keyed out before exporting to ensure the alpha channel works correctly.
As a source, Adobe’s official documentation for exporting in After Effects provides more detailed information on the export process and settings.
