Creating a blue screen composite image starts with a subject that has been photographed in front of an evenly lit, bright, pure blue background. The compositing process, whether photographic or electronic, replaces all the blue in the picture with another image, known as the background plate.

Blue screen composites can be made optically for still photos or movies, electronically for live video, and digitally to computer images. Until very recently all blue screen compositing for films was done optically and all television composites were done using analog real time circuits.

In addition to blue, other colors can be used, green is the most common, although sometimes red has been used for special purposes.

In addition to blue, other colors can be used, green is the most common, although sometimes red has been used for special purposes.

Sources : Internet

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