Green screen problem?

Question

Green screen problem

I was watching a low budget TV station. I think they did not implement the green screen set up well. I see green shadow over the lady news anchor hair and when they have some kind of talk show you can see green color on the lower part of the screen. Also you can see a green reflection on the anchor desk.

Pease give me some idea and will tell them

Answer 1

2 basic things about green screen:

One is your software keyer, many claim that they can chroma key, but not all of them can. For TV, a basic switcher should be able to chroma key well, but I don't know what they have.

Second, which sounds like the problem, is the set up.

- Move the screen as far back as you can. If it's close to the subject, green spill will get on everything.

-Light the green screen evenly. It doesn't have to be so intense that green light is bouncing onto everything - just an even color.

- Make sure your lighting color is correct. To make keying easier, make sure the light hitting your subject is the opposite of the green screen - ie., if you're using a green screen, make sure your lighting has a hint of magenta. If it's a blue screen, use yellow. That will make it easier for your keyer to separate the screen.

Hope it helps, good luck.

Answer 2

there are several issues that might be in play.

in order to work, the screen has to be evenly illuminated, which is not a simple task. the light needs to be above and just in front of the screen so that it hits with a steep angle. If it comes from further out, say by using the same lighting bar as being used for the talent, then it will reflect green light back. this is the cause of the "green desktop". second, as you move down the screen, its lighting tends to drop off because it is at further distance from the light fixture. this is corrected by using a special light fixture that put more intensity towards the floor and gradually less as you come up the wall. this will cure the problem of the green cast breaking through at the bottom of the screen. The "green gills" on the talent's hair has several causes but what i suspect is either poor color timing in the camera, the camera being connected with "composite" video to the switcher instead of components, a mismatch in the switcher delay timing or just low resolution in the keying switch.

Answer 3

I even have an identical issue with between the movies I created a organic green history. i assume the trick is to no longer make the history organic - A common gradiant of green looks to repair this ( make the golf green inperfect)

Answer 4

complicated issue. query over the search engines. this might help!