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Green screen quality with cheap mini DV

Posted: Mon, 9th Apr 2007, 4:13pm

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Force: 400 | Joined: 13th Feb 2007 | Posts: 6

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I've tried reading as much as possible on this site and I can't find anything about my question, so sorry if there is already a post about it.

Basically I'm using CLpro to green screen. I'm following all the green screen tutorials and it all seems to be fine, but then when I render, it always looks a bit crappy. The edges of the filmed object always kind of wabbles and looks messy. It's never a really nice, clean key.

My thoughts are that because I'm only using a very cheap (£180)mini DV recorder (JVC GR-D370ek - rubbish college cam) the quality of the video is too pixelated, not allowing for a clean key because the picture simply isn't crisp enough.
Anyone know if I'm talking any sense or am I talking rubbish and in fact simply can't key?

Replies would be greatly appreciated.


Kontrast Productions
Posted: Mon, 9th Apr 2007, 7:03pm

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Well, I forget the translation of currency to U.S. dollars, but I'm pretty sure that's a low end camera. So yes, that definetly affects your key. Try adding a "Gaussian Blur" effect to the key grade, sometimes that softens the edges a bit. But I'm pretty sure that if you want to start getting into computer generated effects and such, your going to want a better camera.
Posted: Tue, 10th Apr 2007, 9:12am

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Force: 400 | Joined: 13th Feb 2007 | Posts: 6

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Yeah, it's a ridiculously cheap camera. My camera broke so I've had to be borrowing a camera from college. As soon as I get money I should be buying an XL2 though.

Thanks for the response though, nice to know that it is majorly down to the crappy equipment and not me smile

Posted: Wed, 11th Apr 2007, 12:19am

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Another area that can make a large difference in keying quality with cheap cameras is to get as much distance as possible between your actors an the greenscreen. If they are too close, you end up with excessing spill on the edges of your actors, and a decent key becomes extremely difficult. If you can get 6 or 8 feet of clearance between your actors and screen, it helps the keying immensely. The downside is the farther away you get, the bigger screen you need.
Posted: Wed, 11th Apr 2007, 9:15pm

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DavidLittlefield wrote:

Well, I forget the translation of currency to U.S. dollars
One £ = $2 Cnd
$1 Cnd = 85¢ American

Therefore, 1£ = $1.70 American. More or less, anyways.

kontrast wrote:

really nice, clean key
That's because miniDV uses 4:1:1 colour sampling. Hendo explained colour sampling here.