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How to key out the white bg in this footage?

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Jon Hutton
How to key out the white bg in this footage?
on Jun 19, 2012 at 7:20:29 pm

I've got a bunch of footage of dogs shot on this white screen, unfortunately most of the dogs are white themselves, any ideas on going about pulling a key from this?

i.imgur.com/IIeJx.png


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Angelo Lorenzo
Re: How to key out the white bg in this footage?
on Jun 19, 2012 at 7:36:31 pm

Is the camera static and do you have any clean frames of the background? You might be able to pull a difference matte and use that for the brunt attack, but it will take rotoscoping... a lot of rotoscoping.

Keyers like Keylight don't do well with luma keys, they're designed to work from the differences in saturation in each color channel. Primatte is similar, but it uses a weighted color matrix.

Angelo Lorenzo
Fallen Empire - Digital Production Services


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Darby Edelen
Re: How to key out the white bg in this footage?
on Jun 19, 2012 at 10:50:06 pm

The fact that they draped white over the green seems to indicate to me that the end result is expected on a white background. If that's the case then the question becomes: why do you need to key at all?

If they want the dogs on any background but white then I'm afraid that you're in for a lot of roto work.

Darby Edelen


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Jon Hutton
Re: How to key out the white bg in this footage?
on Jun 19, 2012 at 11:22:17 pm

Yes I thought there must have been a reason as well, especially since I have done another 5 episodes of these music videos for them that were all on the green screen, so I e-mailed asking, is there some special reason for this? No is the answer, and no one could give me a reason why they did it. Looks like I'll be working for pennies on the dollar for this one.


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Greg Neumayer
Re: How to key out the white bg in this footage?
on Jun 20, 2012 at 1:25:58 am

I'd try a luma matte or a difference matte first, but either way I'd be making a pot of coffee to go with my evening. I feel your pain. It doesn't matter how many people suggest better pre-production--we're usually lucky if we know the thought process before it gets to post. :)

Antifreeze Design
http://www.antifreezedesign.com


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Roland R. Kahlenberg
Re: How to key out the white bg in this footage?
on Jun 20, 2012 at 1:33:21 am

Rotobrush will be the most productive tool to use. Hopefully the shots aren't too long and you don't have multiple dogs on screen that cross over each other during the shoot.

HTH
RoRK

Intensive AE & Mocha Training in Singapore and Malaysia
Adobe ACE/ACI (version 7) & Imagineer Systems Inc Approved Mocha Trainer


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Kevin Reiner
Re: How to key out the white bg in this footage?
on Jun 20, 2012 at 1:45:53 pm

If they had done it correctly in the past and the results you provided were good, then why did they make this huge change? I would tell them that it is going to take 3-4 times longer because they chose to do it over white. Then negotiate with them from there. If this is a repeating job, you have to play your cards right to ensure future work, but you definitely want to impress upon them that this was a huge mistake. Often the only way to do that is by asking for more money.

I bet you wish you could reach through the screen and rip that white sheet off the wall. Unfortunately there still is no plugin for that.

Good luck. Find some good roto music. Jimi Hendrix always works well for me.

Reiner

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