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Render black as alpha

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stig olsen
Render black as alpha
on Apr 28, 2014 at 9:37:57 am

Hi,

I just got an animation without an alpha channel. The area that is supposed to hold the alpha is black. Can I render this black as an alpha channel?
I know I can screen the footage onto the background but I need to make this clip with an alpha channel.

Stig


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Walter Soyka
Re: Render black as alpha
on Apr 28, 2014 at 2:12:43 pm

http://www.redgiant.com/products/all/knoll-unmult-free/

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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stig olsen
Re: Render black as alpha
on Apr 28, 2014 at 3:12:17 pm

Hi,

Umult makes the rest of the graphic about 5-10% transparent.

Stig


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Walter Soyka
Re: Render black as alpha
on Apr 28, 2014 at 3:33:06 pm

You can use the Levels effect after Unmult to tweak the alpha levels. You may need to combine this with some color correction if it pushes your colors too far out.

Alternately, you can use Extract to pull a luma matte, but you may need to work on the edges a bit.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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stig olsen
Re: Render black as alpha
on Apr 29, 2014 at 8:06:20 am

Thank you!!


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