Shoot at the highest frame size (HD 1080p or UHD 2160p for example) and bit rate that your camera is capable of so that you have as much information to work with as possible.The bright lights evenly lighting the green backdrop can cause the green or blue to reflect, or “spill,” onto your subject creating a highlight that color on them that can make getting a clean key difficult. This can be difficult at times, but it is really valuable to give as much space between your subject and the background as possible. Make sure to separate your subject from the backdrop as much as you are able to.They should match as closely as possible.) (If you want to do a quick check, snap a quick photo and check RGB values of various areas of your background in a photo editing program. You want the background to be one consistent shade of color (the key color): left to right, top to bottom. It’s especially important to avoid shadows on the backdrop as they can make it difficult for your video editing program to differentiate between the backdrop and the foreground. You need to make sure that both your backdrop and your subject are evenly lit to get the best results.A curtain or sheet can work but you need to be very careful of folds and wrinkles that can create shadows that make getting a clean key in post difficult. A painted wall, paper backdrop, or a pop up screen that offers a flat surface are ideal choices.When you're setting up your green screen for production: You need to make sure you set up your backdrop and your camera to get a clean image that makes it easy for your editing program to differentiate between the foreground and background elements. ![]() (Although sometimes it does, intentionally or not, with funny and creative results.)Ĭhroma keying-whether it's green screen compositing or blue screen or any other color-is easy to do when you follow some basic best practices. And green is more common than blue because the very intense green used in backgrounds rarely shows up in clothes or other elements you want to keep. ![]() (We're guessing you could have figured that one out.)īlue and green are usually the colors used for this process because human skin tones fall under shades of red, and typically the subject of the footage you're shooting is a human being. You could also use blue, and many productions do, but that is technically called blue screen. the real or imaginary sky is truly the limit!ĭo you have to use green for green screen? Technically, yes. Then you can replace them with anything else you want.still photos, other footage, animations, virtual backgrounds. The color you want to remove is known as the key color. When we have a large area of the image that is the same color (or a range of very similar colors), it is relatively easy to tell the computer to ignore those pixels and make those pixels transparent. When we're working with digital video, the computer assigns numerical values to define how much red, green, and blue are in each pixel of the video (you might have seen a color identified by it's RGB values-that's those numerical values). Every color image and video can be broken down into combinations of three colors (red, green, and blue) at different intensities. The key to understanding chroma key or green screen compositing is understanding a few basic principles that drive the process. That footage can then be manipulated in post-production to remove the green background and replace it with other footage. ![]() The process involves capturing film or video of a subject performing in front of a flat green background. Originally something that could only be done by skilled visual effects artists working on larger budget film and television, anyone can now incorporate this technique using their mobile device and free apps like iMovie. If you've watched the weather person on the news standing in front of an animated map or forecast for the week, you've seen green screen, or "chroma key" compositing in action.
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