Adobe PREMIERE 5 User Manual page 364

356 APPENDIX B
Compressing Video and Audio
Animation
The settings determine the degree to which the compression is lossy; 100% quality is lossless.
The Animation codec employs an Apple compression algorithm based on run-length
encoding. When set for lossless compression, it can be useful for storing title sequences
and other motion graphics.
Motion JPEG A and Motion JPEG B
to other computers equipped with video-capture cards, particularly across platforms. These
codecs are versions of JPEG implemented by many video-capture cards. Some video-capture
cards include chips that accelerate Motion JPEG so that you can edit faster. See the documen-
tation for your video-capture card to determine its degree of support for these codecs.
Photo–JPEG
a high percentage of edges or other sharp detail, like many photographic still images. Photo-
JPEG is lossy, but at high quality settings, a compressed image is nearly indistinguishable from
the original. Photo-JPEG is symmetrical—compression time is nearly equal to decompression
time, but compression time is too slow for real-time video.
Photo-JPEG is not recommended for images that will be edited later because it is relatively
lossy. However, its high compression ratio and picture quality can make it useful for moving
files between systems, or for archiving finished projects.
Note (Mac OS only): Many hardware compression cards use JPEG. With QuickTime 2.5 or higher,
the codecs for these cards may not be listed in the Compressor menu unless you hold down the
Option key when you click the menu. If you select Photo-JPEG, the correct codec will automatically
be used. Also, additional options for some cards are found by holding down the Option or Control
key while choosing the codec.
H.263 Useful for video conferencing at low data rates; not recommended for general-purpose
video editing.
DV - PAL and DV - NTSC
These codecs let you transfer clips from a connected DV deck or camera directly into Premiere.
They are also useful as transcoders, for transferring digital video across platforms and between
computers equipped with digital-video capture cards.
Useful for clips that use large areas of solid colors, such as cartoon animation.
Useful as transcoders, for transferring video-capture files
Useful for still images that contain gradual color changes or that do not contain
Digital video formats used by PAL and NTSC digital video hardware.