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ProRes 422 artifact

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Tim Wells
ProRes 422 artifact
on Nov 2, 2011 at 8:41:37 am

Hi
I have footage that has come of an Arri Alexa, in Apple ProRes 422, (which is what Arri recommend). I have imported this footage into AE and begun trying to key out the greenscreen, using Keylight 1.2. I'm getting artifacts within the image that are causing problems. I had a pro take a look and he has said that everything looks right to him that the problem is in the codec itself.
Any idea whats gone wrong?

Thanks
Tim


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Walter Soyka
Re: ProRes 422 artifact
on Nov 2, 2011 at 3:09:39 pm

ProRes is a pretty robust codec, well-suited for keying.

Can you post a screen shot showing your problem?

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Brad Wright
Re: ProRes 422 artifact
on Nov 2, 2011 at 5:22:35 pm

I have seen plenty of artifacts with both ProRes 4:2:2 and 4:4:4:4. I've seen some blocky squares in the keying that don't exist in the actual footage. For the very best results, use an image sequence of 16 bit TIFF files or something uncompressed 4:4:4:4.

Brad Wright is software engineer, so often hard to figure out what he is talking about. He is always happy to explain answers further.


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Walter Soyka
Re: ProRes 422 artifact
on Nov 2, 2011 at 5:30:36 pm

[Brad Wright] "For the very best results, use an image sequence of 16 bit TIFF files or something uncompressed 4:4:4:4."

But this won't be an option now -- it sounds like the footage was recorded to ProRes.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Brad Wright
Re: ProRes 422 artifact
on Nov 2, 2011 at 5:40:39 pm

If he client has the ARRI raw files, you be able to use that.

Brad Wright is software engineer, so often hard to figure out what he is talking about. He is always happy to explain answers further.


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Tim Wells
Re: ProRes 422 artifact
on Nov 6, 2011 at 4:52:42 am

Thanks guys
Sorry I didn't reply sooner, it was indeed the prores 422 files, I'm working with the 4444 now and it's a nice clean image. The after effects I am having to use doesn't work with LUTs either but once I had done some color correction I got a very nice key, now just the fun of cleaning up some green spill:)

Thanks again for your feed back.


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