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I have a greenscreen question

Posted: Mon, 3rd Oct 2005, 3:00pm

Post 1 of 7

wildstorm

Force: 0 | Joined: 3rd Oct 2005 | Posts: 4

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Hello, I'm new to the baords so I'm still finding my way around. I am in the process of setting up a greenscreen in my garage. I have a 10ft wide by 8 ft tall wall dedicated for this. Now reading through some of these articles on the forums, I have the option of either using a cloth or painting the wall green. The wall itself is OSB board. (I think thats what you call it) You know the stuff they use when constructing a house. Would it be ok to paint on that? I tried some cans of spray paint earlier. I sprayed 3 coats of primer and after that I applied green paint over the primered area but it seems the paint soaks into the wood. Maybe its because I'm using spray paint instead of getting a gallon of paint and brushing or rolling it on. Anyone got any suggestions? Thank you in advance.
Posted: Mon, 3rd Oct 2005, 3:12pm

Post 2 of 7

ashman

Force: 4913 | Joined: 10th Sep 2005 | Posts: 904

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i had a nightmare with trying 7/8 different products, im now importing my green screen from the usa on ebay. its 10ft x 20ft and perfect for what i need and is costing me $77. thats with a stand. If you have the money then why not, also if you are intrested going that way put chromakey in the ebay search not greenscreen for better results. there is a guide in here some where on D.I.Y greenscreens although im not sure where.
Posted: Mon, 3rd Oct 2005, 3:31pm

Post 3 of 7

wildstorm

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I might go that route. I'm browsing through ebay and the prices for greenscreen fabric is pretty good. One other question that I forgot to ask in my first post, I have a JVC vhs-c video camera. Is that ok to use that for shooting greenscreen shots? I'm finding that the majority of the people here use digital camera's.
Posted: Mon, 3rd Oct 2005, 4:17pm

Post 4 of 7

ashman

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ah, im not sure about analouge eqiupment so i can't help. All i know is that it is definatly worth investing in a digital camera if you can. But i do remember seeing a converter to convert the anolouge into a digital format to play around with it on the pc. once it's in the pc you should be fine to edit and key (greenscreen) what you need. Don't take it as gospel check on the web for a more definate answer.
Posted: Tue, 4th Oct 2005, 8:21am

Post 5 of 7

jotoki

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not sure what this osd board is but any porous material like wood needs treating and sealing before you paint it. Otherwise as you found out the paint soaks in. Probably using brushes rather than spray paint should also help. You need to get more paint on there at a time. Try finding some wood sealer though. That should do the trick.
Posted: Tue, 4th Oct 2005, 12:38pm

Post 6 of 7

wildstorm

Force: 0 | Joined: 3rd Oct 2005 | Posts: 4

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Right now, I have a green cloth on the wall. I'm currently doing some experiments in getting the greenscreen lit evenly. I have one shop light that is hanging above the green cloth and its postioned about 4 ft in front of it. Its lighting the cloth evenly but I'm not getting good keying from it. Here is a picture of the my greenscreen set up: http://wsfilms.net/green.jpg

There's a little wrinkling but its not bad at all. I think part of my problem was that I was standing to close infront of the screen. It didn't cast a shadow or anything but I was under the light also, so when I started keying out the green, part of my skin would get keyed out also. I'm using an analog camcorder. A JVC vhs-c video camera so I was thinking that could be part of the problem also as I'm finding out that the majority of the users are using digital cams.
Posted: Tue, 4th Oct 2005, 1:05pm

Post 7 of 7

jotoki

Force: 1855 | Joined: 28th Dec 2001 | Posts: 630

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well that pic looks ok in itself (apart from it seems to have a slight orange tint but that might be just the camera or my monitor).

Sounds to me like whats happened is a spill of green onto your skin from being so close to the screen. Thats when the colour of the screen ends up being reflected in the object that is the subject of the key. In this case your skin. There is a spill supression adjustment in chromy that should help somewhat but as i'm not a chromy expect i cant tell you exactly how to use it. Go check the tutorials, theres one in there for keying with a bad greenscreen shot. Your screen looks ok but this tute still should help you to understand how to improve your key.