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Difference between real footage and Matte

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mailo homolas
Difference between real footage and Matte
on Apr 17, 2011 at 10:35:01 am

Hi,

Im interested whats the main difference between real footage and matte footage (black and white).(For example ink, splash)

I was trying differences and I couldnt find any. I tried alpha/lumma track matte (with solid layer) and same results for my footages (well almost same, because it gives me different level transparency in result, because footage was green/red, but I can mostly correct this through levels/curves)

Thanks for any response


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Mato Kokotic
Re: Difference between real footage and Matte
on Apr 17, 2011 at 7:36:46 pm

Matte is layer which purpose is revealing underlying layer (be it based on luma or alpha).

Place Matte one layer above the layer you want to reveal and in lower layer TrkMat tab select mode of reveal.

Turn on column Modes if you can't see TrkMat tab.



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Walter Soyka
Re: Difference between real footage and Matte
on Apr 18, 2011 at 1:55:56 pm

A matte is a grayscale image that is used to isolate part of an image for an effect. In general, full white is meant to indicate the parts of the image to use (usually the subject), full black is meant to indicate the parts of the image to ignore (usually the background), and grays are used to indicate some falloff between those extremes.

Mattes are usually derived from real footage. In your ink splatter example, you're right in noting that it doesn't take a lot of work to derive the matte from the footage. Not all mattes are this straightforward, though. Some require chromakeying (or other procedural effects), rotoscoping, or some combination of these techniques to generate. Once an object is separated from its background, though, you can export its alpha as a grayscale luma matte, which would be compatible with just about any compositor on the planet.

Mato has already described how to use a luma matte as a track matte in After Effects.

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
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mailo homolas
Re: Difference between real footage and Matte
on Apr 28, 2011 at 10:26:24 pm

Thank you


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