Matrox DigiSuite LX MAX User & Installation Manual page 144

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based on the luminance of that image (or another
source), so that an underlying image can show
through. See also key source, self-key, and filled
key.
M
mark in To select the first frame of a clip.
mark out To select the last frame of a clip.
mask effect A Matrox effect that uses a
moving grayscale pattern (matte) to superimpose
one clip onto another. Also called traveling matte
effect.
mathematically lossless compression A
method of compressing video without losing
image quality. The video is identical to
uncompressed video, but requires less disk space.
Contrast with lossy compression. See also
uncompressed-quality video.
MIP mapping In 3D graphics, a rendering
technique where a texture is stored at multiple
resolutions. See also texture mapping.
M-JPEG See Motion-JPEG.
module board Printed circuit board and
mounted components that is attached to the base
board using screws and spacers.
mosaic An effect that "blurs" an image by
copying pixels into adjacent pixels both
horizontally and vertically. This gives the image a
blocky appearance, often used to hide people's
identities on television.
Motion-JPEG A compression and storage
standard used for motion video. The JPEG
compression process is applied to each video field,
in succession. Also called M-JPEG.
Movie-2 bus or Movie-2 bus
connector Over-the-top connector used for
high-speed data transfer. These two terms refer to
the assembled component, which consists of a
Appendix B, DigiSuite Glossary
printed circuit board (backplane) with attached
connectors.
MP@ML Main Profile@Main Level. An
MPEG-2 video compression profile that supports
4:2:0 luminance/chrominance sampling at up to
720×576 pixel resolution, and data transfer rates
up to 15 Mb/sec (1.79 MB/sec). This profile is
used for broadcast transmission and distribution on
DVD. See also 4:2:2P@ML.
MPEG A video compression standard that
specifies a series of compression profiles and
image resolution levels, introduced in 1990 by the
Motion Picture Experts Group. MPEG takes
advantage of the redundancy inherent in video data
through a combination of inter-frame and intra-
frame redundancy reduction. The MPEG standard
supports data transfer rates of up to 1.5 Mb/sec
(0.2 MB/sec). Also called MPEG-1. See also
MPEG-2, inter-frame (IBP) compression, and
intra-frame (I-frame) compression.
MPEG-1 See MPEG.
MPEG-2 A video compression standard that
improves upon the MPEG standard by supporting
data rates of up to 100 Mb/sec (12 MB/sec),
scalable modes, field or frame searching, and
much larger screen sizes. See also inter-frame (I-
frame) compression, intra-frame (IBP)
compression, 4:2:2P@ML, and MP@ML.
MPEG-2 IBP An MPEG-2 compression type
that uses inter-frame compression to create a group
of I, B, and P-frames. Used for broadcast
transmission and distribution on DVD. See also
GOP and inter-frame compression.
MPEG-2 I-frame An MPEG-2 compression
type that uses only intra-frame compression (that
is, only I-frames are created). Used for high-
quality distribution and for archiving. See also
intra-frame compression.