Black's Photo Glossary
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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UNDEREXPOSURE
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Occurs when the sensor or film receives too little light because the aperture is too small and/or the lighting is too weak. The resulting picture is too dark and lacks detail.
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UPLOAD
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Transferring a file from a personal computer to another computer or device. The opposite of DOWNLOAD.
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USB
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Universal Serial Bus. A standard connection used to connect various devices, such as scanners, printers, digital cameras, keyboards and mice, to computers.
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