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Chroma keying to transparency for an alpha channel?
Chroma keying to transparency for an alpha channel?
Is there a way to chroma key to alpha? I have a clip I rendered out in Vegas that I want to take over to AE for some 3D enhancements. Some of the FX I have put on in Vegas can only be done in Vegas, so that is why I am not compositing and chroma-keying everything in AE. I need to chromakey this actor with the green background turning to an alpha channel…any ideas?
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4 Replies
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Not sure that this totally addresses your question,
however it is important to render out of vegas as an
uncompressed .avi file since it is the only render format
in Vegas that retains your alpha info. Select uncompressed template, then custom, select video tab and be sure that alpha channel has a check on it.Perhaps you could give us a bit more info on what you are trying to do in Vegas and doing in AE. I’m a bit confused by your question.
Regards, Rick.
Rick Mac
Director of Audio Production
TCT Network – Directv 377 -
Ok, tried and it didn’t work. There is no transparency or alpha channel. I went into the VIDEO tab, and alpha channel is selected. Do I need to make them image sequences? The avi uncompressed did not work for me…
Within Vegas, it works fine. If I have a layer below it, the layer shows through the chroma-key, but when I render out the layer by itself (with nothing underneath, uncompressed) it is just black in the background. I brought the uncompressed avi back into vegas and when I put something below it, it does not show through…weird.The reason I am keeping it in Vegas is because I am using the Median FX filter and they don’t have that in AE that I remember.
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Nevermind, found it. I had to change the properties panel of the media to Straight Alpha channel.
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Glad to here you’ve got it working.
Regards, Rick.
Rick Mac
Director of Audio Production
TCT Network – Directv 377
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