High-tech cameras with CMOS sensors feature built-in noise reduction
circuitry, which assures you of sharper pictures in most conditions. Most digital
SLR (single lens reflex) cameras use CMOS sensors, although there are a few
notable exceptions that use CCD sensors.
QUICKFACTS
UNDERSTANDING IMAGE SENSORS
CCD (charge coupled device) and CMOS
(complementary metal oxide semiconductor) devices
have rows and columns of sensors called photosites.
Each photosite records a portion of the image. When
the shutter opens, each photosite collects and stores
photons. After the picture is taken, the photosite
information is converted, row by row, from analog to
digital and then transferred to the camera storage device.
1 2 Digital Photography QuickSteps Stepping into Digital Photography
PC QuickSteps Getting to Know Your PC 3
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Q: How do digital cameras store images?
A: Modern digital cameras use removable storage media, as shown in Figure 1-1.
Think of camera storage devices as your digital film. They serve the same function
as the hard drive on your computer, but without as many moving parts. Storage
device capacity is measured in megabytes (MB) or, for ultra-high capacity cards,
gigabytes (GB)??”the same units of measure used to measure computer hard drive
capacity.
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