How to export a transparent background as a PNG sequence

I am currently working on a project of special effects editing and I want to remove the black background behind it. I used the screen blending mode to remove the black background and then exported as a PNG sequence (I need in this format), taking care to tick the box of alpha layers before you export. However, when I look at the rendered result, the images still have a black background. Can't export as a PNG with transparency? If there is a box for allowing alpha channels then shouldn't I power? I'm doing something wrong?

Hello

To my knowledge, you can't knock out black with a screen blend mode unless you are compositing it on another element. If you need information on what is generally referred to as "Unmult,' (black unmultiplying to be used for a visual effect) you can read this excellent article from Rich Young on PVC: 'Unmult" with and without plug-ins special by Rich Young - ProVideo Coalition

In the future, I recommend that you check to see if you create an alpha channel. Check it out by switching on the transparency grid in the program monitor. You can also put the Composite Alpha to check the alpha before export. See screenshots.

Thank you

Kevin

Tags: Premiere

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