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Old 03-27-2009, 10:44 AM   #1
sirbruce
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MOBI Output Compression?

Is the default MOBI output compression from Calibre the best that can be done? I notice a lot of books I convert from existing PRC or MOBI files can as much as double in size after conversion.
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Old 03-27-2009, 10:46 AM   #2
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They're probably HuffDic compressed - there is no publicly available code for the compressor, so Calibre can use only the weak PalmDoc compression.
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Old 03-27-2009, 10:48 AM   #3
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Is it using --compress on any2mobi?
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Old 03-27-2009, 10:51 AM   #4
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Are you using the --compress command line option? It uses PalmDOC compression, but is slow to run (although I find it acceptable).

The GUI conversion to MOBI does no compression at all.
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Old 03-27-2009, 10:51 AM   #5
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Nevermind, reading this thread, it seems it doesn't use ANY compression at all:
http://www.mobileread.com/forums/sho...t=36729&page=7

Could an option be added to the GUI for compression in the future? I'd like to see the time vs. space tradoff.

Filed an enhancement ticket http://calibre.kovidgoyal.net/ticket/2165.

Last edited by sirbruce; 03-27-2009 at 10:54 AM.
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