Matrox Electronic Systems Matrox RT.X2 - Manual (Page 200)

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Appendix D, Matrox RT.X2 Glossary
Use this glossary as a reference for many of
the basic terms used in this manual and
related documentation.
Numerics
1394 See IEEE-1394.
2:3 pulldown A method used to create
additional video frames when 24 fps film
footage or 23.98 fps progressive video is
converted to 29.97 fps interlaced video, such
as NTSC. To convert a four-frame sequence
of film or progressive video, five frames of
video are required. The 2:3 pulldown
sequence accomplishes this by representing
the first frame of film or progressive video as
two fields (1 frame), the second frame as
three fields (1.5 frames), the third frame as
two fields (1 frame), and the fourth frame as
three fields (1.5 frames). See also advanced
2:3:3:2 pulldown.
2D Short for two-dimensional. An image
that has height and width only.
3D Short for three-dimensional. An object
in three dimensions has height, width, and
depth. Various techniques are used to show
3D images on 2D surfaces like your computer
screen.
4:2:2P@ML 4:2:2 Profile@Main Level.
An international standard video compression
profile introduced by MPEG-2. It supports
4:2:2 luminance/chrominance sampling at up
to 720 × 608 pixel resolution, and data
transfer rates up to 50 Mb/sec (5.96 MB/sec).
This profile is used for high-quality
distribution and for archiving. See also
MP@ML.
4-corner pin A Matrox effect that lets you
anchor each corner of a video or graphics clip
onto points in an underlying clip, even if the
underlying clip is angled or skewed.
A
A/B roll Typically, A/B roll is an editing
technique where scenes or sounds on two
source reels (called roll A and roll B) are
played simultaneously to create dissolves,
wipes, and other effects. On nonlinear editing
systems, A/B roll refers to using two source
streams (.avi, .wav, .tga, and so on) to create
an effect.
advanced 2:3:3:2 pulldown A method
that is often used to convert 23.98 fps
progressive video to NTSC when the video is
acquired by a camera shooting at 23.98 fps
and recorded to DV tape. Advanced 2:3:3:2
pulldown differs from standard 2:3 pulldown
in that the two middle frames of a four-frame
sequence are each converted to three video
fields. This results in less image degradation
when a reverse pulldown is performed to
convert the video back to 23.98 fps
progressive video.
AGP slot Connection slot to a type of
expansion bus found in many computers. The
AGP slot is used to house the AGP display
card.
alpha key An effect that makes parts of a
foreground image fully or partially
transparent based on alpha (transparency)
values stored within the image’s file, so that
an underlying image can show through. See
also chroma key and luma key.
analog component video See
component video.
analog signal A video or audio signal that
varies continuously, as opposed to a digital
signal which varies only by fixed steps.
anti-aliasing A technique that smooths
jagged edges in computer-generated text or
graphics.
Glossary of terms