Epson Expression 1680 Setup Manual page 118

monochrome
Black and white images, or images represented only by the intensity of
luminosity.
OCR (Optical Character Recognition)
The technology that allows computers to "read" text from physical objects. OCR
requires a graphical representation of text to interpret, which usually comes from
a scanned image.
pixel
Short for picture element. Each image is composed of a number of pixels. Pixels
are also counted in units of dots.
port
An interface channel through which data is transmitted between devices.
resolution
Indication of how finely an image is resolved into pixels. Can be measured in
dots per inch (dpi), pixels per inch (ppi), or samples per inch (spi).
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.
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.
USB
Universal Serial Bus. A hardware interface for connecting low-speed peripherals
such as a keyboard, mouse, scanner, or printer to the computer.
USB hub
A device that normally provides four Type A sockets to increase the number of
USB ports on a PC.
2
Glossary