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Nikon d3100 or d7000 and chromakey

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Alex BadilaNikon d3100 or d7000 and chromakey
by on Mar 21, 2011 at 7:15:20 pm

Hi Can I use Nikon d3100 or d7000 to chromakey?
Nikon using File Format .MOV, and Video compression H.264/MPEG-4 Advanced Video Coding, can edit chromakey ?
H264 Codec compression is no good to chromakey any format(mp4, mov)?
A DSLR camera has iso. Iso help when the light is low, no? So iso is no good to film chromakey?
Which DSLR who record full hd is good for chromakey?
There is specification for nikon d31000 and d7000.
http://imaging.nikon.com/products/imaging/lineup/digitalcamera/slr/d3100/sp...
http://imaging.nikon.com/products/imaging/lineup/digitalcamera/slr/d7000/sp...


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Brian CharlesRe: Nikon d3100 or d7000 and chromakey
by on Mar 21, 2011 at 8:18:36 pm

A chroma key relies on good color sampling for a discussion of sampling types (4:1:1, 4:2:2, 4:2:0, 4:4:4 etc) see:

http://en.wikipedia.org/wiki/Chroma_subsampling

It may be possible to pull a good key from those cameras, but the specifications don't indicate the video color sampling capabilities of either camera.

Any compressed video format or one with a long GOP would need to be transcoded before pulling a key in After Effects.

I've had some success with chroma keys using AVCHD footage from a Panasonic GH1 but I paid careful attention to lighting and did several tests before proceeding.



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Tudor "Ted" JelescuMy humble opinion
by on Mar 21, 2011 at 8:20:10 pm

If you want to shoot chroma you need the best possible method of capturing the image. Although in the end, for a student project, you can theoretically shoot chroma with an iPhone4, that would not provide you with the best results. Even if the footage shot with a DSLR looks good, it is compressed, that means it looses color information that is precious for a good key. So for best results in post get the best camera that you can- RED One or Alexa would be at the top of my list, followed by a full HD camera that captures using as little compression as possible. If you can use a good HD camera and capture to hard disk with no compression at all that's even better.
So my answer is no, I would not recommend a DSLR for shooting chroma for a professional project.

Tudor "Ted" Jelescu
Senior VFX Artist


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Brian CharlesRe: My humble opinion
by on Mar 21, 2011 at 9:03:00 pm

I've used an HVX200 many times with excellent results. It captures in 4:2:2, enough for chroma keying.

Many of the jobs I do are on tight budgets and can't afford RED or ARRI gear.



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Tudor "Ted" JelescuRe: My humble opinion
by on Mar 21, 2011 at 9:17:50 pm

I did quite a few low budget jobs where I had to use a HD camera - see the clip below- it works to a certain extent, with careful planning (like Brian said). However I stand by my previous post- DSLRs are not quite the best option when it comes to chroma.







I think it was a SONY HDW 650

Tudor "Ted" Jelescu
Senior VFX Artist


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Alex BadilaRe: My humble opinion
by on Mar 23, 2011 at 10:14:04 pm

Hi. A DSLR that records in AVCHD, it's good for Chrome?
AVCHD is compressed codec? I saw Lumix gh2.
http://www.engadget.com/2010/09/21/panasonic-lumix-gh2-officially-debuts-16...
About Firestore FS100 records in avi 1, avi 2, quicktime ? these codecs are compressed?


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