I compressed my copy of Keynote, which is really made up of thousands of
files under the hood totaling 611,951,069 bytes (692.5 MB). To test unix
compress I did
tar -zcvf test.gz /Applications/Keynote.app/
which generated a compressed file of 428,440,218 bytes (428.4MB) or
about 61.9% of the original file size. Doing the same thing through the
finder I selected Keynote and then chose Compress from the File menu.
That generated a zip file of 453,379,578 butes (453.4 MB) or 65.5%. Just
for the fun of it I also tried doing a 7-Zip. Downloaded a 7-Zip app for
OSX from here:
http://www.updatestar.com/directdownload/7zx/2188433
which generated a .7z file of 375,098,819 bytes (375.1MB) or about 54%.
So it looks like 7-zip is the smallest (11% smaller than plain zip in my
test) but the downside is that it's not very popular. If you send this
to someone else they will have to go through the bother of finding,
downloading and installing an app to uncompressed it. Pretty much
everyone can handle a zip file without much trouble.
As with all compression, the results are also based on what you are
compressing. Text, which has lots of repeating patterns, compresses
really well. Binary files such as audio, video and images might not
compress at all.
CB
On 3/25/15 7:38 PM, Joe Quinn wrote:
now that SArchiver’s gone down the tubes? what’s the best archiving utility for
the mac? i wanna be able to compress files as small as humanly possible, but
still retain quality. thanks for any info!
--
¯\_(ツ)_/¯
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