Matrox Electronic Systems Matrox RT.X2 User Manual download pdf (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

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