BackgroundThe old days of elaborate and expensive Green (or Blue) screening are gone. Today computers are fast, software is powerful, making the results better than ever! If you never green screened before you're in for a treat, it's addictive and you might just get hooked! So many ads from magazine covers to billboards use this technique and you don't even know it. You see it in the movies all the time. Now you can add that flare to your photos too.
The ScreenThe screen itself could be a painted board, a bed sheet, a commercial muslin, or a piece of cardboard from an office supply store. The material itself is not as important as the uniform color and reflectivity. You do not want a shiny screen as this spills green (or blue) light on the subject. Size is not important as long as it's wide and tall enough for the subject. Green is furthest from skin tone, so it's popular, because blond hair has some green content so blue can be used for those subjects if desired. The subject may be a person or a product. Almost any color screen can be used except white and black, and colors in the foreground subject. A test image of only a picture of the screen can be loaded into Professor Green Screen to test the solid color range, a value below 25 is great. The lower the value the better the setup.
Screen Lights and ColorTry to use soft, diffused lighting and not hard lighting. You want to avoid shadows at all cost. Hard lighting casts shadows, soft light is when the source is hard to detect and the whole area just appears to be lit from every direction. Lighting the green screen uniformly is more important than its actual color. The color could be bluish, greenish, or have a tint of yellow. That doesn't matter very much. What is more important is that the background is as close to one color as possible, and that one color does not appear on your foreground subject. With bad lighting you will experience a rainbow of colors, making it harder to get a good KEY. The wider the range the software has to accept the KEY color the narrower the subject colors can be. This limits your choices of colors in the subject. You want to light the green screen first,and not too bright, otherwise you will reflect the green light from the screen. You will want to be aware of the subjects shadows if they are cast on the screen. Ideally you will want the subject to be away from the screen to avoid green spill on them. This also helps with depth of field focus.
Subject LightingYou will want to light your subject slightly brighter than the screen, the lighter subject helps remove any slight green spill you cannot avoid. Ideally you should light your subject with the background image in mind. If the background has shadows at a certain angle, you will want to light the subject more from that same angle to 'sell' the believability of the final shot.
Screen DistanceThe three main benefits of having the subject away from the screen are:
- Minimize green spill on the subject.
- Remove shadows so the color is more uniform.
- Use the focus and (depth of field) DOF to slightly blur the screen.
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