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Home » Entertainment » Photography » The Chroma Key Effect and More on Its Applications

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The Chroma Key Effect and More on Its Applications

Submitted by S Liston.
Thu, 31 Jan 2013

The chroma key effect is a popular technology that has been used to superimpose one image over the other. The entire special effects industry works on this principle. The movies that contain high end photorealist effects that people watch on the screen are a result of the application of this technology. The application of this technology is also seen on live television. News channels use this technology to create different backgrounds behind their new readers and also to display animated features on live television. A typical chroma key technology takes much into consideration. This involves lighting and set up of the scene.

Production studios have an extensive budget to set up scenes as well as create artificial worlds for recreating the magic of special effects. A typical shot where the chroma key effect is involved will comprises of the actor taking their place at the stage marks and acting. The scene contains nothing but the green screen. However, one the scene is shot the post production team will add all the necessary elements to achieve the desired effect. Currently, the same principle is applied to still images. The green screen effect uses the shade of green as the key which can be dropped out of the image while it is being processed or during the addition of backgrounds.

The application of this technology is profound. Chroma key allows individuals add any background to their personal images without the need to leave the studio. The color of choice used for this process is green; this is due to the fact that most optical devices are sensitive to green. The bayer pattern allocates more pixels to the green channel. This property is similar to that of the human eye which is sensitive to green. Also, the production of still images makes extensive use of this technology. The application of the chroma key effect to produce still images is excellent as it can be use for several image manipulation and compositional techniques.

With the help of software the application of this technology becomes more commercial. Now commercial versions of a photo editing software is available that provides the editing of many images that needs the application of the chroma key effect. However, lighting becomes important when using this technique. This is because lighting plays a crucial role in the way images turn out after production. There is much more processing required for the image after it is composited with a different background. To achieve photorealism the subject will have to be scaled, shadowed and light-up well. The applications that allow the implementation of this effect also provide basic image manipulation filters.

As a technology the Chroma key has come a long way and it has been used in films and various places where such image manipulation have been essential. Applications such as Photoshop and After Effects do provide third party plug-ins to allow users to apply the effects of this technology to their images.


webby is the author of this article on green screen effect. Find more information, about chroma key effect here

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