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Blue Green

Blue Green

Chroma Key, Blue Screen And Green Screen Movies

The magic of movies has become a reality because of  green screen studio and visual effects software technology. Technically, green and blue screens are referred to as chrome keying, color-keying, or colour separation overlay. Which ever term you may prefer calling it, the primary concept behind this art is that the backround, which is normally green or blue screen, is to be removed and replaced by another object.

 

As commonly said, necessity will breed innovation. It goes on to say that the history of chromakeying was born by the need to have control and convenience of filming on the stage. Chroma key nearly eliminate the requirement to choose a real location. Location shooting at some times be extremely difficult, like, the on the top of a mountain, to the impossible, like being underwater, made chromakeying every director and post-production guru's greatest arsenal.

 

Chromakeying starts with a foreground, which is the object being filmed, and the background, whichi is our blue or green screen. Some people might be asking why is that from every color out there are green and blue always used in the movies. The answer is that most subjects are people, and that human flesh color have very little if any green or blue. The main difference between production companies choosing blue versus green is primarily preference. Commonly, analog TV  broadcasting uses blue screen. Blue is preferable for scenes that need to be darker like a night-time scenes. Also, when filming for something that will be chromakeyed on water, blue would work fairly well. For actresses with blonde hair, blue might give a cleaner key.

 

It is true that either blue or green can work very well in todays VFX environment and the choice for background color is generally familiarity and is simply choosing something that will contrast itself from the subject, there are some factors to be considered that will end up leading to leaning towards one from the other. Since blue occurs more on typical clothing items like actresses' pants or even their eyes,  green screen studios often tend to be given choice. Furthermore, green screen requires less light and because of that making it a better choice for most shoots. Green screen has became the common place in the production industry because of digital photography cameras retain more detail in its green colored channel. In the camera, green channels are said to be more noise free. Our sight is also known to be more sensitive and responsive to the green part of the spectrum with the regards to judging brightness. Green also has higher luminance value than blue. Luminance is the encoded black and white info including sharpness, brightness, and contrast of a video signal or graphic image.

 

The recent switch from blue screen to green largely demonstrates the jump from analog to digital. Over the last decade, the use of  green screen sets has become the dominant in video special effects. Great 3D blockbusters like The Matrix, Star Wars, Avatar, Jurassic Park, and much more had heavy usage of green screen in their visual effects. It may be a little awkward at first for the talent, with great special effects staff and the invent of chroma key technology, your movie can be the next big blockbuster.

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