I need some help with shooting green screen on the 7d

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dajavudesigns

Well-known member
I knew shallow dof wasnt gonna be easy to mess with, I just had a client insist on having a ton of people on a very small green screen all moving around one in front of the other and didn't have enough light to not shoot shallow.

Lesson learned, next time I just say no.

The screen was evenly/well lit at 1.8 or 2.0 or so. I shot flat. Should I increase the brightness and contrast next time to really get a limey green? It looks dull when shooting flat.

Would anything in camera help make the keying easier? Other than taking in more light?
 
Making sure the green screen is held tight with clamps etc..
Having a hair light to get ride of green spill on the shoulders and hair, but also to separate them from the green backdrop.
For a less shallow depth use a wide lens and a high f/stop like F/8.
You dont have to shoot flat maybe add some contrast but nothing to drastic maybe like a half or full stop between highlights and shadows
 
a wide lens will affect perspective much more than depth of field; you may want that, or may not

I think your biggest problem will be keying stuff with blurred contours because it fell out of the DoF; you could have tried to minimize your subject's front-to-back distance, or shot at higher f/
 
Wow 1.8 or 2.0 on green screen. Big no no. Looks like it's going to be roto time.

Agreed about he wide lens. More of a perspective thing. Either lens use a high stop.
 
I shoot on my t2i on green screen. f/4 and above works. f/5.6 to f/8 i find to be ideal on my lenses. Usually i shoot on a 28mm or a 60mm at around there and it works pretty well.
While the image is nicer it doesn't key out as well as my hv30s though.
 
The Roto Brush does work really well if you have cs5. I'm loving it. Here's some footage I did real quick with it. It was a moving skateboard image. Lots of moving parts so I was a little nervous. But the rotobrush is awesome. You just step it forward and it predicts pretty good where the tool should go next?

http://www.vimeo.com/18378257

No green screen or anything. There was trees and all sorts of stuff in the background. I couldn't believe how well it worked with just a little tweaking.
 
Yeah. It's not the best but it took 15 minutes. Pretty awesome software. Next time I'll use a bigger image with the footage shot on the same camera.
 
The rotobrush is hit or miss for me. I think it should be used mostly as an aid more than anything. You still need to do a lot of cleanup and manual roto work to get things looking good.
 
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