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   The process is a bit more
complicated than this, but you
have the general picture.  The
computer sends a stream of ons and
offs, and the monitor faithfully
displays these as dots on the
screen. The dots compose your
picture.

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   If you have a color monitor,
there are three electron guns
instead of one, and three dif-
ferent coatings on the glass.
One causes the screen to glow
green where it's electrons hit,
another causes red and the last
causes blue. By mixing these
three colors, you get all the
colors your monitor can put out.
There are actually three
pictures, one in each negative

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color, on your screen.
   Negative colors are a bit
hard to figure out. How can
green + red = yellow? But try
this. Next time your tv is
showing yellow, look at it very
close, and you'll see that up
close, the yellow actually
resolves into red and green!

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   This test is hard to see
on a monitor because the
monitor has greater
accuracy, but a color
television shows it well.
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