User Guide

Glossary
G - 28
Glossary
In post production, the FX is com-
monly referred to as a general term
for any kind of image manipula-
tion such as wipes and keying
effects, 3-D image manipulation,
color variations etc.
GB
àGIGABYTE
Generation
losses
Generation losses are any kind of
quality impairment caused by
duplicating material. Every record-
ing or re-recording causes a degra-
dation in terms of signal quality.
Generation losses are clearly visible
in analog magnetic tape record-
ings.
Digital systems, however, that use
compression, may also cause such
losses. Realization of elaborate dig-
ital tricks by making use of various
effects may lead to
àSEQUENCING
of various compression or decom-
pression steps. If the same picture
material is compressed and
decompressed over and over again,
a loss in picture quality becomes
visible as a result of rounding
errors after a few generations. This
digital recording loss is higher, the
higher the compression factor.
Digital duplication losses are usu-
ally of no importance in normal
editing without multiple effect lev-
els.
Gigabit Ether-
net
àETHERNET
Gigabyte
Measuring unit for data quantity.
One gigabyte corresponds to 1 024
megabyte. This value is a result of
the computing tradition to count
by power of two:
1GB=210MB=220kb=230bytes=1,
073, 741, 824 bytes.
Many manufacturers nowadays
have do no longer work with this
traditional binary system and are
using the decimal system instead in
which one gigabyte corresponds to
1, 000, 000, 000 bytes.
GOP
Group of pictures
àMPEG
GPI
General Purpose Interface.
Interface that creates simple start/
stop commands. GPI jacks are
often located in genlocks and lin-
ear editing controls. GPI impulses
are used for triggering external
devices and to start a Sequence of
effects via GPI or to fetch the next
stored page of a title generator or
fixed image system.
GUI
Graphical User Interface.
Graphical user interface, i.e. the
monitor screen by means of which
the user operates a computer or
other devices.