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Full Discussion: can anyone help
Top Forums UNIX for Advanced & Expert Users can anyone help Post 5904 by rwb1959 on Sunday 26th of August 2001 01:21:54 PM
Old 08-26-2001
Check your tape system documentation.
The "compression" they refer to is
device level compression and even though
they may say 40/80GB, you can typically
expect an average of a 1 to 1.5 compression
ratio (60GB) after all is said and done.
There are many binary files which will not
compress well at all (in some cases they
actually increase in size). You can (as previously
suggested) use software compression such as
"compress" or "gzip" to be able to get more
data on the tape but if you do so, the
device level compression (if used) may end up
increasing the size of the data stored to tape.
 
PLSCOMPRESSION(3plplot) 					    PLplot API						   PLSCOMPRESSION(3plplot)

NAME
plscompression - Set device-compression level SYNOPSIS
plscompression(compression) DESCRIPTION
Set device-compression level. Only used for drivers that provide compression. This function, if used, should be invoked before a call to plinit(3plplot). Redacted form: plscompression(compression) This function is used in example 31. ARGUMENTS
compression (PLINT, input) The desired compression level. This is a device-dependent value. Currently only the jpeg and png devices use these values. For jpeg value is the jpeg quality which should normally be in the range 0-95. Higher values denote higher quality and hence larger image sizes. For png values are in the range -1 to 99. Values of 0-9 are taken as the compression level for zlib. A value of -1 denotes the default zlib compression level. Values in the range 10-99 are divided by 10 and then used as the zlib compression level. Higher compression levels correspond to greater compression and small file sizes at the expense of more computation. AUTHORS
Geoffrey Furnish and Maurice LeBrun wrote and maintain PLplot. This man page was automatically generated from the DocBook source of the PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere. SEE ALSO
PLplot documentation at http://plplot.sourceforge.net/resources. August, 2012 PLSCOMPRESSION(3plplot)
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