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Re: Is RED blue or green

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Re: Is RED blue or green
by Russell Lasson on May 5, 2008 at 12:49:52 am

I was involved in a green screen test that worked awesome. We shot a guy with long, fuzzy, blonde hair on a green screen. We exported a still as a 4K dpx file through RedAlert. In Shake, after just one click to select the key color, we had an awesome key that really didn't get any better the more we played with it.

Typically, blonde people on a green screen is discouraged, but in this case, we had a great success.

I think that the big difference maker was the fact that we were dealing with 4:4:4 images at 4k. We compared the results we could get after converting the file to ProRes and it was very obvious that the ProRes 4:2:2 compression was much more difficult to key. It still worked, but you had to work with it to get good results.

So I would say that green was good. Anyone tried keying off of blue?

The the current build, there has been quite a bit of noise in the blue channel when compared with the other channels in some circumstances. So that would leave me to believe that green would key better than blue. We'll have to see if there are changes in build 16 once it's released.

-Russ

Russell Lasson
Kaleidoscope Pictures
Provo, UT


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