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Exporting in AE CS4 with TRANSPARENT background
Hello,
Thank you in advance for reading my post:I’ve been keying footage out in AE using keylight and am now ready to export some of these files. However, when I’ve exported using the “render queue” the footage is coming out with a black background behind the keyed image, rather than a checkered transparency.
Will someone please tell me what settings I need to adjust to export and retain transparency?
Thanks!!!
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2 Replies
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Amy,
You need to export your footage with an Alpha Channel.
This is the information that tells your editing software
whats “not there”Not all codecs can carry an alpha channel.
A lot of image sequences can, as well as the lossless
codec.Click on your output modual under the video output/Channels
if you change this to RGB+Alpha that will enable it
on supported codecs.One of your render Q presets should be “lossless with Alpha”
and is a good one to go with.
-Andy
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Here’s a paragraph from “About alpha channels and mattes” that tells what formats can contain alpha channels:
“Many file formats can include an alpha channel, including Adobe Photoshop, ElectricImage, FLV, F4V, TGA, TIFF, EPS, PDF, and Adobe Illustrator. AVI and QuickTime (saved at a bit depth of Millions Of Colors+), also can contain alpha channels, depending upon the codec (encoder) used to generate the images stored in these containers. For Adobe Illustrator EPS and PDF files, After Effects automatically converts empty areas to an alpha channel.”
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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