One
of the tools most enjoyed by the students is the "chromakey".
This is the same technology used by TV stations to put the
weatherman in front of the weather map. Our instructors take
advantage of this technology in various ways. This is how it
works.
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| 1. The
teacher stands in front of a screen or wall painted a special
shade of green. |
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2. The
camera sends this image to the video switcher. |
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| |
| 3. Then
a second image is chosen for the background. In this example
a map image from the computer is used. |
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4. The
computer sends this image to the video switcher. |
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| 5. The
video switcher electronically strips the green background
out of the image..... |
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6. ....
and the map image is electronically inserted in place of
the green area. |
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7. The
video switcher then combines the two images into one. 
Of
course, this is not limited to just maps. Any other video image
can be just as easily placed behind the instructor. 
