User guide

276
Appendix C, Matrox RT.X100 Xtreme Glossary
hue The tint or tone of a color. For
example, the difference between the color
green and red is its hue.
I
IBP compression See MPEG-2 IBP.
IEEE-1394 An international standard data
transfer protocol created by Apple Computer
under the FireWire trademark and
standardized by the Institute of Electrical and
Electronics Engineers (IEEE). It enables
simple, low-cost, realtime data transfer
between computers and consumer and
prosumer electronics products, such as DV
camcorders and DV decks. Commonly
referred to as 1394.
I-frame compression See MPEG-2 I-
frame.
I-frame (Intra-frame) A frame created
during the MPEG or MPEG-2 compression
process that contains all the information
required to reproduce a complete image. It
allows random access points within a video
stream, and acts as a reference point for B-
frames and P-frames to be built. I-frames are
editable because they contain enough data to
construct an entire video frame, unlike B-
frames or P-frames.
insert editing Recording new video and/
or audio material onto a prerecorded (or
striped) tape. Insert edits can be made in any
order, unlike assemble edits, which must be
made sequentially.
inter-frame compression A video
compression method that compares a series of
frames in a video sequence and removes the
redundant data. Inter-frame compression
treats all the frames in the sequence as an
interdependent group. As a result, most of the
frames can’t be edited independently. Also
called temporal redundancy reduction.
Contrast with intra-frame compression. See
also GOP.
interlaced scanning A method of
creating a video image by drawing only the
odd numbered lines on the screen in one pass,
then the even numbered lines in the next pass.
Two passes are therefore required to create a
complete frame of video. NTSC and PAL
displays are interlaced. See also progressive
scanning.
interleave A technique used to incorporate
the video and audio portions of a video clip
into one file. See also AV I .
interpolate To create a gradual transition
between different Matrox effect settings
applied to a clip. See also keyframe, linear
interpolation, and spline interpolation.
intra-frame compression A video
compression method that removes redundant
information from within a frame. Intra-frame
compression treats each frame of a video
segment independently. Several video
compression formats use the intra-frame
method. These include Motion-JPEG, DV,
and MPEG-2 I-frame. Also called spatial
redundancy reduction. Contrast with inter-
frame compression. See also I-frame (Intra-
frame).
IRE unit An arbitrary unit designated by
the Institute of Radio Engineers to define the
amplitude of a video signal. 1 IRE is equal to
approximately 7 mV.
J
JPEG (pronounced “jay-peg”) Joint
Photographic Experts Group. A compression
and storage standard used for still, digital
images. See also Motion-JPEG.
K
key effect See alpha key, chroma key, and
luma key.
keyframe A particular frame at which one
or more effect settings have been defined on a
clip using the Matrox realtime plug-in.
Settings applied at a keyframe remain active