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Render with a transparent background?

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Luke McFaddenRender with a transparent background?
by on Oct 28, 2010 at 9:58:45 pm

This seems easy, but I can't figure it out? I've got a simple animated element (basically some lines) that I want to render with a transparent background for a friend to use in another project. But every time I render it, it comes up with the composition's background color. How can I disable the background color or change it to alpha?


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Andy GeorgeRe: Render with a transparent background?
by on Oct 28, 2010 at 10:06:42 pm

You just need to choose a codec that supports Alpha Channels. Animation, PNG, and most image sequences (tiff, psd) would work. If the codec has an option to set to millions of colors+ then you know it supports an alpha. The + is the Alpha.

-Andy George
Senior Editor
http://www.chiselindustries.com


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Luke McFaddenRe: Render with a transparent background?
by on Oct 28, 2010 at 10:32:53 pm

So if I use Quicktime w/ Animation and have RGB + Alpha and Millions+ set, and even with these settings, my background is still the color set in my comp settings?

Also, how do I end up with a file that isn't HUGE. I'm doing 720p@30, and with a minute long video, I've got a HUGE file. For a 60 second comp, I've got a 500mb file!


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Andy GeorgeRe: Render with a transparent background?
by on Oct 28, 2010 at 10:41:14 pm

That's the correct settings, but it will only create an Alpha Channel where there is no information. So if you have a background layer on you need to disable that first.


AE's defualt is to show an Alpha as black. Click the little checkerboard looking box underneath your comp preview to show a checkerboard where your alpha is going to exist.
This makes it easier to verify where you alpha lives but has no effect on the render one way or the other.

The Animation codec creates huge files. 500MB for 60 seconds sounds pretty reasonable.

-Andy George
Senior Editor
http://www.chiselindustries.com


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Luke McFaddenRe: Render with a transparent background?
by on Oct 28, 2010 at 10:48:46 pm

Are there other options that I can use to get a smaller file and still maintain the transparency? The person will be importing the file into After Effects.

L


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Richard van den BoogaardRe: Render with a transparent background?
by on Oct 28, 2010 at 10:48:52 pm

Transparency means you choose no color for your comp. Just leave at black and use solids instead if you need colors. But if you want to superimpose your composition inside your NLE, you need to have the background black...

500MB for a 60 second clip is not unreasonable for a file that contains 3 color channels + 1 alpha channel. Since it's uncompressed it will render/playback very fast.

Richard van den Boogaard
Freelance cameraman • Glidecam Operator • Editor • YouTube expert


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Luke McFaddenRe: Render with a transparent background?
by on Oct 28, 2010 at 10:53:09 pm

When I use these settings now, It is just giving my a black background rather than a transparent one.


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Andy GeorgeRe: Render with a transparent background?
by on Oct 28, 2010 at 11:01:14 pm

When you click on the toggle transparency grid button can you see the transparency grid?
If not then your not going to get an Alpha chanel because there is no absence of information there.

Have you thought about just sending them the AEP if they are going to take it into After Effects anyhow? If your not using any footage that file would be much smaller. If you are using footage you can use the File>collect files command to put it all in one folder for you.

You might get slightly smaller results from the PNG codec. It would be minimal if it was. From what I understand of your project Animation is probably the best choice for it though.

-Andy George
Senior Editor
http://www.chiselindustries.com


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Richard van den BoogaardRe: Render with a transparent background?
by on Oct 28, 2010 at 11:08:13 pm

Also, if you ZIP/RAR/SIT your uncompressed file before sending it off, you may get quite impressive results.

Richard van den Boogaard
Freelance cameraman • Glidecam Operator • Editor • YouTube expert


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Todd KoprivaRe: Render with a transparent background?
by on Oct 28, 2010 at 11:23:31 pm

> Also, how do I end up with a file that isn't HUGE.


"FAQ: Why is my output file huge...?"

---------------------------------------------------------------------------------------------------------
Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
Premiere Pro Help & Support
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Roland R. KahlenbergRe: Render with a transparent background?
by on Oct 29, 2010 at 11:31:36 am

DUDE! There is no such thing as "transparent color". All applications will resolve to rendering an RGB color in transparent areas. What this RGB color is, is usually taken from a background color defined by the application.

Further, an Alpha Channel defines the areas of transparency and opacity of the cumulative RGB channels. The RGB channels do not provide any information pertaining to transparency.

Therefore, it doesn't matter what color the transparent areas are in the RGB channels as these will be deemed as transparent once the Alpha Channel information is invoked.

HTH
RoRK

AE Training in South East Asia. AE templates for sale and rental. Click here for more


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