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Epson expression 1640xl scanner Manual

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4 Glossary
scan
An operation performed by the sensor and the carriage. The image is divided
into pixels by scanning.
scanning area
The physical size of the image that can be scanned by the scanner.
SCSI
Small Computer System Interface. This is one method used to connect your
computer to peripherals such as scanners, hard disk drives, CD-ROM drives, and
others.
SCSI ID
The numbers that all devices in a SCSI connection (see daisy chain) use to identify
each other. If the same ID number is used by two devices in the same daisy chain,
the devices cannot operate properly.
subtractive primary colors
The colors of cyan, magenta, and yellow (CMY) which produce black when mixed
in certain amounts. In printing, black is often added to give more definition as
mixing of actual inks cannot produce pure black.
terminator
A device that stops electronic signals, and prevents them from proceeding or
returning to other devices. This is necessary to stop a signal from continuously
reflecting between devices.
threshold
A reference point that is used to determine whether data will be processed as
"on" or "off". In the case of color image data, "on" means that a certain color will
appear in a pixel or dot, and "off" means that color will not appear there.
tone correction
A method of adjusting the tone curve so that the reproduction results on different
types of output devices have gradations similar to the original image.
tone curve
The graph that shows the contrast ratio between the input (original image) and
output (image data) in image processing.
unsharp mask
Originally a photographic process in which a sharply focussed and a slightly out-
of-focus image are combined to produce a sharper image. This process is
simulated by software to produce the same effect.
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