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PLEASE H E L P!! Keying/Masking/Overlay??

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Jeremy ColePLEASE H E L P!! Keying/Masking/Overlay??
by on Dec 31, 2010 at 3:11:25 pm

Hey, I've been editing a broadcast job which was shot on 7D and all looks very nice and sweet.

There's just one bit I've been struggling with:

I've been given a shot with a band walking across a billboard (all live action - 3 band members - static - on tripod), and on this billboard, the director wants a music video to be projected on the billboard as they walk in front of it (all-together about 7 secs).


Obviously this would be a piece of piss if shot on green screen, and I've attempted creating a mask and key-framing the mask around the guys walking by frame-by-frame. Which looks... okay, but really not great.

I do have a 'blank-slate' of the image - including the bill but no band. Is there a simple way of inserting the blank slate over the moving image, and telling AE to ignore everything that looks like the blank slate on the moving image???? <---This probably makes no sense, but it's the same thing that can be done on Mac's Photobooth when imposing an image of yourself over the ocean or space or whatever.

I'm tired, but any help would be massively appreciated...

Nice one.

Jeremy Cole
http://www.vimeo.com/channels/jeremycole


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Walter SoykaRe: PLEASE H E L P!! Keying/Masking/Overlay??
by on Dec 31, 2010 at 4:24:16 pm

[Jeremy Cole] "Is there a simple way of inserting the blank slate over the moving image, and telling AE to ignore everything that looks like the blank slate on the moving image?"

You could try the Difference matte effect [link].

If you can't get satisfactory results with that, and if you have AE CS5, you could use the new Rotobrush tool [link] instead of manually masking. Read all the docs that I linked to first -- there are some great tips in there for how to get the most out of rotobrush, and it's not necessarily all intuitive.

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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Joey ForemanRe: PLEASE H E L P!! Keying/Masking/Overlay??
by on Dec 31, 2010 at 4:30:26 pm

If you're using AE CS5, you can try the Roto Brush tool. What color is the billboard? If it has large areas of white, or is lighter or darker overall than the actors, you may be able to pull a serviceable Luma Key for a good portion of it. Otherwise you've got the right idea in rotoscoping the actors.

Joey Foreman
Editor/Compositor/VFX Artist


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Tudor "Ted" JelescuRe: PLEASE H E L P!! Keying/Masking/Overlay??
by on Dec 31, 2010 at 7:20:26 pm

Unfortunately it looks like you have to bite the bullet and do the rotoscoping. Roto brush may work, but I have the feeling that in the shot you described it will not.
To create a clean plate (to pull a difference key) choose several stills from the clip where different parts of the billboard are revealed and use PSD to create one. This may be your best option.

Tudor "Ted" Jelescu
Senior Compositor/VFX Artist


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Michael SzalapskiRe: PLEASE H E L P!! Keying/Masking/Overlay??
by on Jan 3, 2011 at 3:31:28 pm

If the Rotobrush tool doesn't work for you. Here are a bunch of resources [link] for how to do rotoscoping more quickly and more easily.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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