MARC21-007: Level of compression of electronic resource
lossless
Lossless compression will allow an electronic resource to be compressed and decompressed with absolute fidelity each time. To be considered lossless, no informational loss may occur during this process.
b
An example of a lossless compression scheme would be TIFF Group 4 compression employed on bitonal image files.
lossy
Lossy compression schemes employ techniques which average or discard some of the encoded digital information. When the file is decompressed, it will not be an exact replica of the original file.
d
Examples of lossy compression schemes include JPEG, and Kodak ImagePac (Photo CD), AC-3 (Dolby Digital) and MPEG.
mixed
Mixture of techniques has been used to compress various parts of the electronic resource.
m
uncompressed
Electronic resource has not been compressed through the use of any compression technique.
a
unknown
Compression techniques are not known.
u
Published