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If youve been to a movie in the past few years, youve seen examples of blue screen photography, even if you were unaware of it at the time. Blue or green screen photography is just one of the techniques used to show Transformers stomping LAs skyline into the dust – but there are other examples. Each nights weather forecast includes a meteorologist standing in front of a blue background while an animated map of the country is seamlessly composited behind them.
There are a few basic rules about shooting blue screen portraits, but you can feel free to break or ignore most of them if you like because nobody ever said a digital image had to look realistic. The first thing that you will need is a blue or green screen background. This can be blue or green seamless paper or you can use a background specially designed for blue screen photography. These are available from all of the usual background suppliers.
Lighting equipment for blue screen photography is less important than how you light your subject. Its important to avoid shadows from the person falling onto the background. Shadows on a background are not a good idea for any kind of portrait, but can especially be a problem in blue screen portraiture because the shadow could follow the image when its composited. That can be a good thing or a bad thing depending on your final image.
Its a good idea to match the direction of the light in the blue screen portrait with the direction of the light in the background image. Thats the best way to do it when you already have a background image in mind, but I realize that may not always be possible. Instead, you may want to play with the lighting in the blue screen portrait to give yourself options later.
Unless you are shooting for a specific combination of foreground and background images, its a good idea to crop the subject a bit looser than you might ordinarily do when making a portrait. Again, it gives you options.
I like to work with wider apertures to minimize any wrinkles that may be in the background, especially with collapsible blue screens. Light hitting any wrinkles render them in a slightly different shade of blue (or green.) This doesn’t mean you can’t shoot at any aperture. A softer, smoother background means less postproduction work.
The only unbreakable rule in blue screen portraiture is that the person in your photograph should not wear blue clothing or have anything else on thats blue. If you want the subject to wear blue, switch to a green background.
Joe Farace is author of Studio Lighting Anywhere thats available from Amazon and your friendly neighborhood book or camera store.