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flying in front of Old Capitol : Tallahassee, Florida |
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Digital
cameras have a lens, aperture, and shutter, but they do not use film. Instead,
digital cameras use a solid-state device called an image sensor. Photosensitive
diodes on the surface of the image sensor convert light passing through
the lens into electrical impulses.
The charge
from each of the photosensitive diodes is measured and converted into
a digital number. The final image is composed of a series of square picture
elements (pixels), each with its own numerical value.
Although
the image quality is not as good as conventional photographs, digital
images are convenient because they do not require chemicals or paper to
process. They can be displayed on a web page, sent via e-mail, stored
on a computer hard drive or a compact disc, and printed on a page.
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