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Chroma Key without replacing background
I have FCP and Boris Red. This is what I want to do.
I want to give my instructional technology team green screen files where the background has been keyed out. However, I want to give them the speaker with no replacement to substitute for the green screen. So if I key the green and do not put a background picture or video, I guess I would have what I want. What file format should I export this in to keep the alpha channel intact. The team I am giving this to will be using it in flash or other web design programs. That way they can have more freedom with the video to move and put anything in the background they wish.
If someone could just point me to a tutorial or give me a quick overview of how to do this I would greatly appreciate it. I have done many keys in the past and simply replaced the background with other video or a picture. I have never tried this before. Thanks in advance.
Mike
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4 Replies
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FCP won’t do alphas like you want. You need to pull the Key in After Effects or similar, and then you can render to Animation codec + alpha.
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After you pull the key, leave the sequence UNRENDERED on track 2 with nothing on track 1 (empty) and then Export > Quicktime Conversion. Change the format to ‘Quicktime MOvie’ then hit the options button.
CLick the ‘Settings’ button in the video portion and keep the frame rate @ current change the compression type to Animation and be sure the depth says ‘MIllions of Colors+”. The plus (+) is an alpha channel. Click OK.
Change the audio settings to whatever is best for you (linear PCM, 48k, 24 bit). Click OK.
name the file, set a destination, then click save.
Jeremy
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[CharlieX] “FCP won’t do alphas like you want. You need to pull the Key in After Effects or similar, and then you can render to Animation codec + alpha. “
Sorry CharlieX. You can export alphas from FCP, it just takes a few steps.
Jeremy
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Whatever thing with Alpha Channel that you bring to FC time-line keeps his Alpha, as long as you don’t set a solid background, and you export it with a codec that supports Alpha.
This is my oportunity to say again that Animation is becaming odlfashioned. RGB and 8 bits, when now so many people are working with YCbCr 10b.
Rafael
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