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  1. #1
    Help with compressing files and folders..

    Member Since
    Nov 09, 2009
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    149
    Help with compressing files and folders..
    Hi..I am looking for help as to what i am doing wrong when trying to 'compress' a file or a folder. i am trying to upload stuff to my mobile me and to compress it, I am right clicking the photo or folder to 'zip' it. the computer then zips it all up...but the zip file is EXACTLY the same size as the uncompressed file!

    what am I doing wrong, please? I am using mac OS X 10.6.3

    thanks!

  2. #2
    Help with compressing files and folders..
    mrplow's Avatar
    Member Since
    Oct 01, 2007
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    UK
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    27" iMac i7 (2011) 10.10, iPhone6, iPad Air 2, AppleTV2
    If it's JPG format images you're ZIPing then they aren't going to get any smaller as they are already compressed. All ZIPing will do is package them into a single file.

    As a test create a folder with several large text filts, html files, spreatsheets etc. Then compress that folder and you'll see a bigger difference.
    External hard disk acquisition addict - but admitting the problem is the first step to a robust backup

    Please use the reputation system if you think you've been helped - top right of this post

  3. #3
    Help with compressing files and folders..
    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
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    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3
    AS @mrplow said, certain files get compressed REALLY well (text usually) and others are already compressed..like MP3, JPG..and so on..

    Regards

  4. #4
    Help with compressing files and folders..

    Member Since
    May 27, 2010
    Posts
    21
    You're right, I'm sure. But I can sometimes shrink compressed files by stacking compression. For example, I've compressed a bzipped file with gzip or the other way around. I just haven't tried to stack-compress an image file. Zip's "-9" option tells the computer to try harder than usual to compresses files. Newer versions bzip2 make the machine assume that you want the compressed file to be as small as possible. Be careful, though, because compression-stacking can enlarge the compressed file. The good news is, even if it does that, the uncompressed file will be its normal size.

    See all the fun stuff you can do when you prefer a command-line to a GUI?
    Quote Originally Posted by Raz0rEdge View Post
    AS @mrplow said, certain files get compressed REALLY well (text usually) and others are already compressed..like MP3, JPG..and so on..

    Regards

  5. #5
    Help with compressing files and folders..

    Member Since
    Mar 30, 2004
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    USA
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    Quote Originally Posted by Bill McEnaney View Post
    You're right, I'm sure. But I can sometimes shrink compressed files by stacking compression. For example, I've compressed a bzipped file with gzip or the other way around. I just haven't tried to stack-compress an image file. Zip's "-9" option tells the computer to try harder than usual to compresses files. Newer versions bzip2 make the machine assume that you want the compressed file to be as small as possible. Be careful, though, because compression-stacking can enlarge the compressed file. The good news is, even if it does that, the uncompressed file will be its normal size.

    See all the fun stuff you can do when you prefer a command-line to a GUI?
    Yeah...I'm sure you can redefine the laws of mathematics

    Look, if you combine every compression scheme known to humanity, you might get your 10 MB folder full of compressed files down to 9.5 MB...and only spend about an hour doing it. Probably not worth your time.

  6. #6
    Help with compressing files and folders..

    Member Since
    May 27, 2010
    Posts
    21
    Yeah, technologist, go ahead: Gloat, gloat, gloat. Everybody else does. My diligent new iMac squeezed hard enough to make my favorite jpeg portrait's eyes bulge. Unfortunately, the poor machine disappointed me by shrinking the 832,029-byte file to lackluster 798,632 bytes. Can't fault the guy for tryin', though, can ya?
    Quote Originally Posted by technologist View Post
    Yeah...I'm sure you can redefine the laws of mathematics

    Look, if you combine every compression scheme known to humanity, you might get your 10 MB folder full of compressed files down to 9.5 MB...and only spend about an hour doing it. Probably not worth your time.

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