Vegas MSP - How to use alpha channel from Elab xportd footag
Posted: Mon, 14th Apr 2008, 10:44am
Post 1 of 7
I have Vegas Movie Studio Platinum ver 7.
I have made a fire in Effects Lab Pro and exported it (have tried all the options I could to export it but still have the below problem e.g. multilayer, retain alpha channel etc.).
I now add the video file (I made in Elab) to a track above my video footage, how do I make the black bakground from my Elab footage transparent? If I right click and look at the properties of the Elab footage, I don't know what to select as the alpha channel (and think I have tried selecting all the different type to no avail e.g. premultipled with black colour as the alpha).
The track with the Elab footage on is set to alpha and not multiply, but the black background just doesn't disappear.
If I add the "chroma keyer" video filter to the track with Elab footage and select the black, then it makes the black transparent but the fire looks terrible and blocky.
Am I missing something? Why can't I make Vegas pick up the alpha channel and make it transparent?
Posted: Mon, 14th Apr 2008, 2:25pm
Post 2 of 7
Its probably just a matter of rendering from EffectsLab to a format that supports alpha channels. You're either going to need to render to an image sequence that can support them, or render to the Quicktime Animation codec, and set the color depth to "millions+". What render settings are you using?
Posted: Mon, 14th Apr 2008, 5:53pm
Post 3 of 7
I first rendered with render settings = direct show AVI, when I went to render - DV video encoder, but that came out NTSC (I'm rendering for HDV).
Then I tried render settings = Quicktime, render but that came up with some error (maybe I need to re-install QT) and closed ELAB.
Then Final I ran render settings = direct show AVI, when I went to render - uncompressed DV (which came out 1440x1080 1.333 PAR).
Posted: Mon, 14th Apr 2008, 11:45pm
Post 4 of 7
Yeah, you'll need to render to quicktime or an image sequence to retain alpha channels.
Posted: Tue, 15th Apr 2008, 9:40am
Post 5 of 7
OK, excellent, thanks for the help.
So AVI doesn't keep the alpha channel then, got it!
Posted: Mon, 3rd Aug 2009, 1:27am
Post 6 of 7
I'm having the same problem, and none of these fixes are working. I'm rendering retaining alpha channel, Quicktime, millions+, then importing into Vegas 7. None of the manual alpha channel options in Vegas are allowing the alpha channel to allow the black background to become transparent. What else am I missing?
Posted: Mon, 3rd Aug 2009, 4:22am
Post 7 of 7
Here's the process:
In the 'Render Settings dialog, select "Single File", "Quicktime (.mov)" and make sure the "Retain alpha channel" box is ticked.
Name your movie, and hit Save.
In the Compression Settings window, select "Animation" as the compression type, make sure the Color depth is set to "Millions+" and hit OK.
The alpha channel will be embedded in the file. After you import the rendered file into Vegas, if the alpha channel isn't working, then it is something that needs adjusted in Vegas, so that it treats the alpha the way you want. I can't tell you what to change or where to look for the controls, as I've never used Vegas. But I can tell you that the process I gave will work for embedding an alpha channel in the footage.