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White outlines when rendering FLV +Alpha from AE
I am working in CS4 I am exporting my video as a FLV RGB+ALPHA the first few came out fine I’m having issues with a few other files…
When I do a ram preview everything looks fine when i render them out I am getting this weird white outline around the subject( it is keyed footage)
Another file I’m rendering out is giving me a different issue. This video the opacity is going from 0% to 100% in the first few seconds for a fade in and while its fading in it give me a while silhouette before it gets to 100% opacity..
I have no idea what is going on!! Please help!
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2 Replies
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the background color in the comp (composition>background color) is probably set to white and the color render with alpha is probably set to premultiplied, which means the keyed layer is rendered over that background color, effectively blending them together.
what you’ll want to do is set the render to render with alpha, but set the color to ‘straight (unmatted)’.
here’s a good tutorial that explains this render setting:
https://library.creativecow.net/articles/rabinowitz_aharon/straight_vs_premult.php
and here’s a good description from the manual:
https://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f7ea.html
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
https://blogs.adobe.com/toddkopriva/2009/06/flash-flv-alpha-channels-strai.html
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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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