How do you decide between speed and compression in doing zip files in OS X?
Sent from my iPhone > On Mar 26, 2015, at 10:50 AM, Todor Fassl <fassl....@gmail.com> wrote: > > There are theoretical limits to the amount of compression you can get without > loss of information although different compression algorithms would work > better or worse depending on the stuff you are compressing. The OP said he > wanted his stuff compressed as small as humanly possible but that would > depend on his stuff. But zip, which is part of Mac OS,has a parameter for > whether you want more speed or more compression. I doubt any other utility > can do a lot better than zip. Like I said, there are theoretical limits to > how much compression you can get so I doubt you'll get more than a few > percent smaller files with some other tool. > > Note: If you try to compress an already compressed file, like an mp3, it will > probably get bigger. > >> On 03/26/2015 10:26 AM, 'Chris Blouch' via MacVisionaries wrote: >> 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! > > -- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to macvisionaries+unsubscr...@googlegroups.com. > To post to this group, send email to macvisionaries@googlegroups.com. > Visit this group at http://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To post to this group, send email to macvisionaries@googlegroups.com. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
