Comments

Liam_Vegas wrote on 1/23/2005, 8:49 PM
Yes... you have to render it as uncompressed AVI (not to DV AVI). That will maintain the alpha channel.
randyvild wrote on 1/23/2005, 9:59 PM
I tried what you said but still get a black background. Look at my example it is my flash of CD/DVD DUPLICATION here at this link:

Vild Productions

I made this in Vegas then used Wildform flex for flash transfer.
Spot|DSE wrote on 1/23/2005, 10:13 PM
Randy, when you render something in Vegas that's keyed out, you'll need to render a 32 bit avi, which means it's uncompressed. When you reinsert it to the Vegas timeline, you may need to right click and choose properties, then choose the Alpa channel/matted. Then the black you're seeing will go away.
I've not looked at your vid, I'm on dialup, but this is a fairly straightforward process. I'd recommend just rendering a short piece to a new track, putting something underneath it so you can see it matte, and then you'll be up and running.
rmack350 wrote on 1/23/2005, 10:19 PM
To add to this, you have to specifically choose to save as 32bit uncompressed avi. 24bit doesn't include the alpha channel.

Rob Mack
nickle wrote on 1/23/2005, 10:20 PM
Also,

When you render to Video for Windows, default template (uncompressed)

click the "Custom" button, then the "Video" tab and make sure "Render alpha channel" is checked off.
randyvild wrote on 1/23/2005, 11:20 PM
I understand how to have blackbackground in vegas to be alpha. I have no problem creating different backgrounds on different tracks. My problem is if I render lets say an object thats moving with no background in vegas then insert it in another program I then will see a black background. BUT if I take a snapshot of an image and make a .PNG I then do not see the black background...I want to achieve this for video AFTER I render I do not want to bring this back into Vegas.

-Maybe when I do uncompressed AVI it's transparent but then this flash convertor im using might not support it...hmmm

Thanks,
Randy
nickle wrote on 1/23/2005, 11:51 PM
I just now put a clip on the timeline, used a bezier mask to cutout a part and rendered it as I mentioned above.

Then brought it back to the timeline, told Vegas the media had a straight unmatted alpha channel and it works fine.

If you used a mask or chromakey or imported something that does in fact have an alpha channel then you can render it the same way.

If the program you open it in doesn't recognize it, them maybe you have to tell it that there is an alpha channel in some way.
Grazie wrote on 1/24/2005, 12:04 AM
" BUT if I take a snapshot of an image and make a .PNG I then do not see the black background... Well, randy there you have said it. The "other" programme IS making a trannie background for you. When I save a PNG in PsP it asks me if I want to save the PNG with the trannie bacground - I can then choose! So that's how your other programme knows what to do. With Vegas, you have to "force" the issue. You have to select the options for creating a tranni background.

I've just done a whole load of flashing numbers with exactly this approach and it works very well.

We'll get there!

Grazie