ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

White outlines when rendering FLV +Alpha from AE

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
christina ruleWhite outlines when rendering FLV +Alpha from AE
by on Apr 27, 2010 at 3:06:29 pm

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!






http://www.christinarule.com


Return to posts index

Dave LaRondeRe: White outlines when rendering FLV +Alpha from AE
by on Apr 27, 2010 at 3:16:25 pm

This should be really easy. You've got the wrong type of Alpha Channel. Now, I never mess with FLV's, but somewhere in the settings you will find a choice between Straight and Premultiplied. You used Premultiplied on the bad example above, and you need to set AE to make a Straight alpha channel.

That should fix the problem.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


Return to posts index

Todd KoprivaRe: White outlines when rendering FLV +Alpha from AE
by on Apr 27, 2010 at 3:19:23 pm

http://blogs.adobe.com/toddkopriva/2009/06/flash-flv-alpha-channels-strai.h...

---------------------------------------------------------------------------------------------------------
Todd Kopriva, Adobe Systems Incorporated
putting the 'T' back in 'RTFM' : After Effects Help on the Web
---------------------------------------------------------------------------------------------------------
If a page of After Effects Help answers your question, please consider rating it. If you have a tip, technique, or link to share---or if there is something that you'd like to see added or improved---please leave a comment.


Return to posts index


Kevin CampRe: White outlines when rendering FLV +Alpha from AE
by on Apr 27, 2010 at 3:18:59 pm

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:

http://library.creativecow.net/articles/rabinowitz_aharon/straight_vs_premu...

and here's a good description from the manual:

http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906...

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]