Glossary 533
Glossary
Web Design in a Nutshell, eMatter Edition
spatial frequency
Refers to the concentration of detail in an image. For example, an image of a
blue sky would be considered to have low frequency. A detailed image, such
as a close-up of blades of grass, has high frequency.
telnet
An internet protocol for logging into and using a remote system on the
Internet. Telnet is a client/server system that requires a telnet server running
on one computer and a telnet client on the other.
temporal compression
In video, temporal compression takes place over a series of frames, deleting
information that is repeated between frames (also called “interframe”
compression).
Unix
A multiuser, multitasking operating system developed by Bell Laboratories. It
also provides programs for editing text, sending email, preparing tables,
performing calculations, and many other specialized functions that normally
require separate applications programs.
W3C
The World Wide Web Consortium; a consortium of many companies and
organizations that “exists to develop common standards for the evolution of
the World Wide Web.” It is run by a joint effort between the Laboratory for
Computer Science at the Massachusetts Institute of Technology and CERN, the
European Particle Physics Laboratory, where the WWW was first developed.
WAVE
Waveform Audio File Format. This format was developed for the PC but is
now supported on Macintosh as well.
Web Palette
The set of 216 colors that will not dither or shift when viewed with browsers
on 8-bit monitors.
XML
Extensible Markup Language; a new standard for marking up documents and
data. XML is based on SGML, but with a reduced feature set that is more
appropriate for distribution via the Web. XML allows authors to create
customized tag sets to provide functionality not available with HTML.
XSL
Extensible Style Language; a system for controlling the presentation of
complex XML documents and structured data.
XSSI
seeServer Side Includes.