
Glossary
309
Glossary
Gateway
A connection between computer networks, or between a computer network
and a telephone line. It is very popular, as it is a computer or a network that
allows access to another computer or network.
Grayscale
A shades of gray that represent light and dark portions of an image when color
images are converted to grayscale; colors are represented by various shades of
gray.
Halftone
An image type that simulates grayscale by varying the number of dots. Highly
colored areas consist of a large number of dots, while lighter areas consist of a
smaller number of dots.
Mass storage device (HDD)
Mass storage device (HDD), commonly referred to as a hard drive or hard disk, is
a non-volatile storage device which stores digitally-encoded data on rapidly
rotating platters with magnetic surfaces.
IEEE
The Institute of Electrical and Electronics Engineers (IEEE) is an international
non-profit, professional organization for the advancement of technology
related to electricity.
IEEE 1284
The 1284 parallel port standard was developed by the Institute of Electrical and
Electronics Engineers (IEEE). The term "1284-B" refers to a specific connector
type on the end of the parallel cable that attaches to the peripheral (for example,
a printer).
Intranet
A private network that uses Internet Protocols, network connectivity, and
possibly the public telecommunication system to securely share part of an
organization's information or operations with its employees. Sometimes the
term refers only to the most visible service, the internal website.
IP address
An Internet Protocol (IP) address is a unique number that devices use in order to
identify and communicate with each other on a network utilizing the Internet
Protocol standard.
Glossary
310
Glossary
IPM
The Images Per Minute (IPM) is a way of measuring the speed of a printer. An IPM
rate indicates the number of single-sided sheets a printer can complete within
one minute.
IPP
The Internet Printing Protocol (IPP) defines a standard protocol for printing as
well as managing print jobs, media size, resolution, and so forth. IPP can be used
locally or over the Internet to hundreds of printers, and also supports access
control, authentication, and encryption, making it a much more capable and
secure printing solution than older ones.
IPX/SPX
IPX/SPX stands for Internet Packet Exchange/Sequenced Packet Exchange. It is a
networking protocol used by the Novell NetWare operating systems. IPX and
SPX both provide connection services similar to TCP/IP, with the IPX protocol
having similarities to IP, and SPX having similarities to TCP. IPX/SPX was
primarily designed for local area networks (LANs), and is a very efficient protocol
for this purpose (typically its performance exceeds that of TCP/IP on a LAN).
ISO
The International Organization for Standardization (ISO) is an international
standard-setting body composed of representatives from national standards
bodies. It produces world-wide industrial and commercial standards.
ITU-T
The International Telecommunication Union is an international organization
established to standardize and regulate international radio and
telecommunications. Its main tasks include standardization, allocation of the
radio spectrum, and organizing interconnection arrangements between
different countries to allow international phone calls. A -T out of ITU-T indicates
telecommunication.
ITU-T No. 1 chart
Standardized test chart published by ITU-T for document facsimile
transmissions.
JBIG
Joint Bi-level Image Experts Group (JBIG) is an image compression standard with
no loss of accuracy or quality, which was designed for compression of binary
images, particularly for faxes, but can also be used on other images.
JPEG
Joint Photographic Experts Group (JPEG) is a most commonly used standard
method of lossy compression for photographic images. It is the format used for
storing and transmitting photographs on the World Wide Web.
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