How to replace color background with Alpha channel?

Explorer ,
May 14, 2018 May 14, 2018

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I've made a circle animation I want to use to illustrate that a button on a smart phone has been pushed.

It's an animation  of concentric circles interacting quickly then fading away, just about 1 second. I created it in Premiere,2018 essential graphics, but it has a black background, while the circle animation is red.  I'd like to export it but I don't want the black background. How can I export it without the black background and with an alpha channel? I turned off the "composite" in the monitor view and chose "Alpha" there but my red circle turned white so that's no good. I'm thinking I may have to make the red circle in illustrator but I don't know that program, so I hope there's some other way.  Thanks for any help!

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LEGEND , May 14, 2018 May 14, 2018
Place the animation on the timeline. Clicking on the wrench at the lower right corner of the Program Monitor, set the monitor to display the transparency grid:If your animation looks correct (the transparency is correct) then export the animation from the timeline in a codec that supports a matte channel, like ProRes 4444, or QuickTime Animation.MtD

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LEGEND ,
May 14, 2018 May 14, 2018

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Place the animation on the timeline. Clicking on the wrench at the lower right corner of the Program Monitor, set the monitor to display the transparency grid:

Screen Shot 2018-05-14 at 7.59.08 AM.png

If your animation looks correct (the transparency is correct) then export the animation from the timeline in a codec that supports a matte channel, like ProRes 4444, or QuickTime Animation.

MtD

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Explorer ,
May 15, 2018 May 15, 2018

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Meg, Thanks for your help. When I did as you directed and set Quicktime/animation codec, I still got a black background in the output.  I went back and tried it again. This time I checked X render at maximum depth (and under that) X 8-bpc + alpha. That time it rendered out my circles with an alpha channel. Yea!

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Participant ,
May 31, 2021 May 31, 2021

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Cleared up my problem.  Thank yu!!!!

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