Rendering Movie with Alpha

Rain Mooder wrote on 6/5/2003, 9:07 PM

So I have a movie that should have some transparency because
I can see the bottom layer through all of my tracks. I mute the
bottom layer and then render to HuffyUV with the alpha switch
turned on. I import the resulting video into another project and when I
fiddle with the alpha switch in properties I can't get the transparency back.

I think this is because Vegas defaults to flat black with zero transparency as
an invisible lowest track. How do I get this thing rendered minus the over-all black.

Comments

philfort wrote on 6/5/2003, 11:24 PM

Did you check the "Render alpha channel" box in the Video tab when rendering the first one?
I don't know what HuffyUV is, but as far as I know, the only way to get alpha is to render as an uncompressed AVI.

sdmoore wrote on 6/6/2003, 8:10 AM

> the only way to get alpha is to render as an uncompressed AVI

I believe Quicktime .mov files can have alpha too ( can't remember which codec I used though )

philfort wrote on 6/6/2003, 10:37 AM

Just now I looked through the quicktime stuff, and found an "Animation" setting that had a choice for 32bpp.... That seemed to render the alpha properly (still had to set the channel in the properties dialog when brining it back in to vegas though).

sdmoore wrote on 6/6/2003, 1:39 PM

Ah yes, that was it! 8o)