These are optional but you may consider using them in your setup. Additionally they can provide dramatic lighting on your subject. They can make the extractions easier and also help reduce green spill. Kickers and hair lights are great for separating the subject from the screen. However, if the brightness of the green screen in the digital image file drop below around 45% as sampled in Photoshop then you should consider lighting the screen itself. There are way too many different situations and variable to give and exact rules to this. In this case, you may need to light the screen itself. However, if the person is too far away from the screen or if the lights are too close to the person then the ratio of light exposing the person to how much light reaches the screen will become to offset. You can often get away without lighting the screen. Two strobes should be considered then minimum. However, this should be good enough to get a good extraction. Since some screen areas are lit by 2 lights and other areas are lit by one light, there will still be some shadowing. The area that is shadowed by one light is illuminated by the other. A simple way to accomplish this is by using 2 flash strobes at an angle to the person (one to the right and one to the left). For shadows, a general rule of thumb is the brightness value, as sample in Photoshop on the digital file, should be greater than 25% brightness. For this case, all areas of the screen should receive light by at least one flash source. Try to avoid dark shadows whenever possible, Sometimes shadowing can't be avoided, For example, when doing a full body shot with the subject standing on the screen, there will be no way to avoid shadows. With that said, you should still sty to get decent lighting on the screen. Because of this, you can get creative with your lighting setup, even if that means the screen is not perfectly even. In general, EZ Green Screen is more forgiving than a lot of other extraction methods. There are MANY ways to set up green screen that will work fine with EZ Green Screen.
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