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Magix Movie Edit Pro 15 Manual

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MPEG glossary 271
www.magix.com
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...File size BRV...Bit rate video BRA...Bit rate audio t...Length in
s
lock
or almost all image file editing techniques the image is subdivided
nto 8 x 8 pixel blocks (image points). This should be noted if you
ould like to used user-defined image resolutions (width/height), and
hey should always be a multiple of 8.
hroma format
he color value of each image point consists of the color values for
he primary colors red, green, and blue (RGB), and for traditional and
echnical reasons it is transformed into one brightness value (Y =
.299*R = 0.587*G + 0.114*B) and two color difference values (U = R
Y, V = G -Y).
he Y value alone produces the black and white picture. These signal
omponents allow brightness and color information to be handled
eparately. The first data reduction occurs when single rows
omprising a picture are read. Because the human eye has a lower
olor resolution than a brightness resolution, the color components
re recorded only for every other point of a row (4:2:2) for each four
ixels grouped (4:1:0), i.e. color signal under-reading.
:2:2 This corresponds to the established TV standard. One piece of
olor information is transmitted per row for two pixels which
orresponds to a 2/3 compression of the output data.
:1:0 This is the color coding used for DVDs and most other
onsumer video applications. For each 4 pixels grouped together on
wo rows, one unit of color information is saved. This corresponds to
output data compression of 1/2.
ield
half-image, i.e. two halves which combine to produce a frame (see
e-interlacing (on page 273)).
rame
frame is a single image from a video sequence which also called a
ull image. PAL video, for example, contains 25 frames per second,
TSC 29.97 frames.
… 271 …


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