shooting a chroma key suit under difficult conditions
Posted 06 January 2011 - 07:43 AM
I'm in pre-production on a project which makes heavy use of chroma key suits. The tough thing is that I'm shooting it outdoors in bright sunlight. After initial tests with industry standard lime green suits I discovered that they reflect too much light and the result is washed out and basically unkeyable (luma keying is messy too). Is anyone aware of chroma key suits in alternative, duller fabrics that do not reflect as much light?
Official chroma key suits seem to come only in shiny green, lime or blue so I had to think laterally. This COULD be an option:
And yes, I am aware that it was built for something other than chroma keying!
Think it'll float? I'm opting for magenta because it clashes least with my background.
Anyway, if anyone has ever used a chroma key suit under bright sun, I'd love to hear from you!
Posted 06 January 2011 - 06:22 PM
Posted 07 January 2011 - 02:30 AM
Posted 07 January 2011 - 03:34 AM
Posted 08 January 2011 - 03:52 AM
I'm still not sure whether to go with red or magenta suits (which will give me a lower IRE reading at the same exposure?)
I'm sure you envisage problems so i'd love to hear about them!
Posted 08 January 2011 - 03:28 PM
When you shoot your defocused clean plate, you should probably move the camera back or use a wider lens, so that you get enough of the scene to cover the full range of camera movement. Depending on how the camera moves, you may possibly need multiple clean plates that you stitch together.
The other option is to actually paint the performer out in each shot, which would give you an image that already moves properly and matches, that you could then defocus yourself.
As for the suits, you can certainly try to find a suit that exposes better, but rotoscoping is pretty much inevitable. You're never going to get a perfect key off of something that has contours and uneven lighting and moves around a lot. Even if you can get a pretty good key, you're going to have to clean it up with roto.
Posted 09 January 2011 - 07:05 AM
Anyway, thanks for talking me through this one. All the best with your projects.