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Chroma Key Photography refers to the process of creating a picture by combining two images through photography. In this type of shooting, a photographer places the foreground subject against blue or green background. This background is then removed and made transparent that allows the selected background image to reveal.
A photographer should follow a few essential techniques or steps without which such photography is incomplete. First, you photograph the foreground subject against an evenly lit and green or blue colored background. If you mount a cloth or a paper on a wall, you should ensure that it is not creased or folded from any side. Unnecessary folds can cause shadows in the image. Photographers use green or blue color specifically as these colors are sensitive to the image sensors in the camera. One should also ensure that the foreground subject contains as little of the background color as possible. For instance, if the subject has blue eyes then a photographer should use green background color. There is another example to decide the choice of a background color. For instance, if a photographer wants to show the subject in a green hilly area he should use green color in the background. In such a case, it is easy to merge this shade with scenery of green colored hills. One should place the subject from the background as far as possible. This prevents from producing undesirable shadows on the subject. The foreground subject should be well lit and the light distributed should be even. Even distribution of the light prevents any shadow falling on the subject's face or clothes. During earlier times, a photographer removed the background colors on film. Then he laid the film physically over a second image. With the advent of digital imaging and digital compositing, one can remove the background color by digitally selecting the color and deleting the colored background. In this process, a photographer generates the transparency for overlay on the new background. When the process is completed, a subject can be placed at any unbelievable and imaginary part of the universe in the image.
If a photographer uses chroma key photography effectively, it can produce the best results. The process is popular for photo shoot, magazines, newspapers, news stations, documentaries, portrait photography and many other purposes.
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