Apple QuickTime VR - Manual (Page 93)

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A P P E N D I X
Compression
Compression reduces the size of your media files and improves the interactive response time
of your QTVR movies. Compression methods are referred to as
codecs because a method
specifies a compression scheme as well as a decompression scheme.
Several compression methods are available in QuickTime VR Authoring Studio. This appendix
discusses those methods that are best to use with QTVR media files:
m Animation
m Cinepak
m Graphics
m Photo JPEG
m Video
Choosing a compression method
Each compression method has strengths and weaknesses. Some methods are more
appropriate for storing video than they are for storing still images. Some compression
methods introduce more distortion in the final product than others. Some compress slowly
and decompress quickly, while others compress and decompress at the same rate. Some
methods can compress a file to one one-hundredth of its original size, while others decrease
the file size very little.
When you choose a compression method, consider the following:
m the source material
m the quality of the compressed image
m the file size of the compressed image
m the time it takes to compress and decompress an image