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Chroma Key suggestion

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Ernest Rosado
Chroma Key suggestion
on Dec 22, 2012 at 2:42:54 am

First week of the year I'm going to be lighting and shooting a music video for my friend's band. We want to do most of it with chroma key for virtual sets and a few cool vfx that I will do all in AE.

Here's the problem: His hair is a large, bright neon green and blue mohawk.

I'll try to get a picture to post here, but the left half is green and the right half is blue, and I'm not sure how to chroma key this.

Can anyone recommend another color of fabric to use for the screen perhaps? Would purple work?


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Vishesh Arora
Re: Chroma Key suggestion
on Dec 22, 2012 at 5:35:03 am

Ernest

You can use any color for BG but make sure it does not appear on the subject.

For more info, go through this thread:

forums.creativecow.net/thread/2/1006610

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):







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Angelo Lorenzo
Re: Chroma Key suggestion
on Dec 22, 2012 at 6:08:51 am

Have him dye his hair or you should get ready to rotoscope a lot of frames; I suggest stocking up on Red Bull if you choose the latter.

Keying on green is highly preferred for a few reasons: digital sensors are more sensitive to green thanks to the bayer pattern (you end up with better edge detail in the green channel), and it's also one of the colors furthest away from the hue family that makes up all human skintones.

The alternate suggestion would be keying with magenta, but I think you'd be hard pressed to find a backdrop or paint that is pure in hue enough to get the job done.

Rosco florescent pink is the only paint color I think may be near appropriate, but I have a feeling it is not indigo enough to fully protect skintones. Quarts are extremely expensive too.

--------------------
Angelo Lorenzo

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Darby Edelen
Re: Chroma Key suggestion
on Dec 22, 2012 at 8:30:26 am

I like Angelo's suggestion of having your friend dye his hair the best. I'd keep one side of his hair blue and dye the other red. This should make it fairly trivial to change the red hair to look green in AE if your friend really wants the green/blue look. It will be much harder to find a color you can key green & blue hair & mostly red skin against.

Darby Edelen


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Ernest Rosado
Re: Chroma Key suggestion
on Dec 22, 2012 at 9:19:34 am

Thanks for the thoughts guys.

The blue/green combo is kind of his thing, he's been doing it for years, so dying it isn't really an option.

I'll do a few tests with some magenta fabric, and if I can't get that to work I may abandon the chroma key idea and just stick to a traditional shoot.

Thanks again


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Angelo Lorenzo
Re: Chroma Key suggestion
on Dec 22, 2012 at 8:19:17 pm

Ah, that's pretty ingenious, a double key. Didn't cross my mind.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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