Under exposure . A picture which appears too dark because insufficient light was delivered to the imaging system. Opposite of over exposure.

Unsharp Masking (Unsharp Mask). The process by which the apparent detail and sharpness of an image is increased. Generally accomplished by the input scanner or through computer manipulation using editing software.

USB. (Universal Serial Bus). This is the data I/O port on most digital cameras and is also found on modern home PC and Mac computers. It is faster than the serial port and transfers up to 12Mb/s (megabytes per second) with v1.1 interfaces.

USB 2.0. The newest USB standard which is close in throughput speed to FireWire, up to 400Mb/s.

UV Filter. This is an Ultra Violet 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 color temperature of the scene. Can be used 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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