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U
Underexposure
- A picture that appears too dark because insufficient
light was delivered to the imaging system. Opposite
of overexposure.
Unsharp
Masking - A process by which the apparent detail
of an image is increased; generally accomplished by
the input scanner or through computer manipulation.
USB
- Universal Serial Bus - the data I/O port on most
digicams and found on modern PC and Mac computers.
Faster than the serial port. Up to 12MB/s with v1.1
interfaces.
USB
2.0 - The newest USB standard, close in throughput
speed to FireWire now. Up to 400MB/s.
UV
Filter - This is an UltraViolet absorbing filter
that helps overcome the abundance of blue in outdoor
photographs. Not really necessary in digital photography
as the camera's white balance system adjusts for the
colour temperature of the scene. We do use them to
protect the camera's lens from scratching, fingerprints
or dirt.
UXGA
- Refers to an image resolution size of 1600 x 1200
pixels.
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