![]() ![]() Since the color needs to be uniform and distinct from the subject, green and blue screens are commonly used as they differ from human skin tone. ![]() Chroma keying is also known as color keying, or as what the broadcasting industry conventionally called, color-separation overly (mainly by BBC). Alternatively, the actors can wear green color cloth, and get removed in postproduction to become invisible. To operate the brightness level Luma keys are needed.Ĭhroma Key: It singles out a particular color from the background, making it transparent so that the subject can be composited with another background.To separate the elements by color requires Chroma keys.With this selection, one can remove it to make it transparent (green screen in VFX) or perform color grading, such as adjusting only the sky's color without affecting the environment. Keying: It is the process of isolating certain parts from the image by color or brightness. Bearing in mind these concepts, we can start to make green screen videos from scratch. The color spill is the biggest challenge during the shooting stage. What is Chroma KeyĬhroma key is one of the keying process commonly used in filmmaking, visual effects creation, broadcasting, and gaming. ![]() Things have been much easier with the chroma keying technique in post-production software, such as After Effects, Final Cut Pro, Premiere Pro, and many chroma key tools and plugins for users of all levels. French filmmaker Georges Méliès, the godfather of VFX, found the method to create matte with double exposure, American director Norman Dawn improved the matte with the glass shot, and Disney used to adopt sodium lap and prism to create a real-time matte to remove background. The idea of removing background or masking part of the scene has been existed long before the modern-day, without the help of digital video effects software. It ushers in a movie era with fantasy scenes that are inaccessible in real life, transports us into the deep space, and brings onto screen whatever one can dream up. However, it can also cause the problem of ‘green spill’ if the lighting and the subject’s distance from the screen is optimized before shooting.Green screen is one of the most frequently adopted techniques in filmmaking. Since there’s no green in a human’s skin tone or clothing, it offers a better contrast between the subject and the background and can therefore be keyed out easily, without affecting the other elements of the picture.Īnother reason that green is used is because it has the highest luminance among all the color channels (RGB), which makes green screens very bright (because of their high luminance). This is why you want to choose a screen with a color that has very little chance of matching anything in the foreground. For example, if the subject is wearing a green badge on his body, then that portion would be keyed out while editing, making it look like as if there’s a hole in his body. Consider this: if anything in the foreground has the same hue as the color you want to key out (in this case, green), then it will be keyed out too. The most basic one is the fact that green ‘stands out’ reasonably well while filming any footage. That being said, why is green the most commonly used color in videos and movies involving a lot of visual effects? There’s no obligation to use the color green. You can use any color, such as yellow, purple, red, or pink, to use this feature. There’s no hard and fast rule, either technologically or ethically, about using a particularly colored screen when you want to apply Chroma Key. You can’t actually recreate the scene in the real world, since you can’t make actors dart through actual bomb strikes (unless you want to spend millions of dollars on every take and likely end up in prison), but at the same time, you want to make the scene look as authentic as possible. More specifically, you want to show the actors running through ruins and constantly evading aerial attacks. For instance, let’s assume that you want to shoot an action scene from a superhero movie. While shooting videos that involve a lot of visual editing, you need to consider a few things, namely things that will facilitate editing in the later stages of post production – during the shooting itself. Since you’re most likely to see the use of green or blue screens in action, fantasy or sci-fi movies – or during weather forecast reports – it doesn’t take a rocket scientist to figure out that the green screen must have something to do with the one element that is common in all of these different media – visual effects and animation. Draped in blue: Blue is another widely used color during the filming of action/animation movies (Image Source: )
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