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Alpha Channel Detection
Hello All. I am running FCP 5 and attempting to stack a movive file with an alpha channel on it that I rendered out of After Effects on top ov another video track in the timelinr. Problem is that, for some reason, FCP is not displaying the alpha channel info. I’ve done this several time in the past with no issues. I looked at the file’s properties and FCP shows that it contains an alpha, but will not display the underlying video track.
Any ideas. Deadline of 3pm!
Thanks for any help.
Colin Williams
Pensive CrowG5 dual 2.5, FCP 5, OSX 10.3.9, Blackmagic Decklink SP
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4 Replies
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Taken care of. Thanks.
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Colin,
It would help many people here if you would share how.
Have a wonderful day.
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You’re right. Sorry about that. Apologies.
When I was working in After Effects (6.5), the artwork had a black background that I missed. (Yes, I know, elementary mistake. I was in a rush.) The reason I missed it was because I set the background color in AE to black while working and realised I needed to remove the black layer and re-render the QT file.
After doing so, I re-imported into FCP and everything worked fine.
A quick note: In the AE render settings, I set the Alpha Channel to premultiplied. After placing the Quicktime file in the FCP timeline the channel looked a bit jagged. So I set the Alpha Type in the ‘Modify’ menu to ‘Black’ and the result yielded cleaner edges on the alpha channel. Not sure why, but it worked.
Thanks for the suggestion on reporting my findings.
Hope this can be of help to someone.
Cheers,
Colin Williams
Pensive Crow(2) G5 dual 2.5, 1.5G RAM, FCP 5, (2) Decklink SP, Sorenson Squeeze 4.1, (2) Beta SP UVW 1800, DVCAM DSR 25, PCM-R300, BVM-1910 HR, After Effects 6.5, Studio 8, etc.
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Colin,
Yes, very good, thanks. I usually set my alphas in AE to straight. they look horrible in Quicktime by the key is beausiful.
Have a wonderful day.
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