1 Reply Latest reply: Sep 15, 2010 5:49 PM by Andy Bay RSS

    How to export a video with an alpha channel that can be switched off

    Andy Bay Community Member
    Andy Bay Sep 15, 2010 5:18 PM

      Hi!

       

      I'm stuck with something that I think might have a simple solution:

       

      I need my video to have an alpha channel while still keeping all the RGB information in place too. This is for Syntheyes, which can take the alpha channel for a video and use it as a garbage matte while tracking.

       

      The problem is that if I draw a mask around my video and then export as a PNG (with alpha), the RGB information seems to be gone even when I choose to ignore the alpha channel. I know how to edit the alpha channel in Photoshop while still keeping the RGB elements untouched, but how should I do that in AE?

       

      Any help will be appreciated!

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        • 1. Re: How to export a video with an alpha channel that can be switched off
          Andy Bay Community Member
          Andy Bay Sep 15, 2010 5:49 PM (in response to Andy Bay)

          Okay I will answer my own question:

           

          This worked as soon as I did a proper export as a PNG image sequence. I did my tests with only single frames by using the "save frame as file" -function, which did not work properly (the rbg information was gone).

           

          So the simple solution to this question was:

           

          Draw a mask on the video layer and export with alpha. The RGB will be there, even though the mask hides it in AE.