New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Switcher Hangout The place for switchers to discuss their new machines, and how to work with OS X. General support can be had here for newbie stuff, like "How do I restart my new iMac?" :)

Help with compressing files and folders..


Post Reply New Thread Subscribe

 
Thread Tools
bluefox9er

 
Member Since: Nov 09, 2009
Posts: 148
bluefox9er can only hope to improve

bluefox9er is offline
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!
QUOTE Thanks
mrplow

 
mrplow's Avatar
 
Member Since: Oct 01, 2007
Location: UK
Posts: 6,731
mrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond reputemrplow has a reputation beyond repute
Mac Specs: 27" iMac i7 (2011) 10.10, iPhone6, iPad Air, AppleTV2

mrplow is offline
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
QUOTE Thanks
Raz0rEdge

 
Raz0rEdge's Avatar
 
Member Since: Jul 17, 2009
Location: MA
Posts: 7,506
Raz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant future
Mac Specs: 27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3

Raz0rEdge is offline
AS @mrplow said, certain files get compressed REALLY well (text usually) and others are already compressed..like MP3, JPG..and so on..

Regards
QUOTE Thanks
Bill McEnaney

 
Member Since: May 27, 2010
Posts: 21
Bill McEnaney is on a distinguished road

Bill McEnaney is offline
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
QUOTE Thanks
technologist

 
Member Since: Mar 30, 2004
Location: USA
Posts: 4,744
technologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond reputetechnologist has a reputation beyond repute
Mac Specs: 12" Apple PowerBook G4 (1.5GHz)

technologist is offline
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.
QUOTE Thanks
Bill McEnaney

 
Member Since: May 27, 2010
Posts: 21
Bill McEnaney is on a distinguished road

Bill McEnaney is offline
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.
QUOTE Thanks

Post Reply New Thread Subscribe


« doesnt read some dvd's | auto spell check help »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Hide files see only folders. emjaca OS X - Operating System 1 03-09-2010 09:05 AM
Time Machine Files & Folders Question The_Grudge OS X - Operating System 5 12-14-2009 08:54 PM
dvd.media files seen as folders irnside OS X - Operating System 1 11-21-2009 11:10 AM
Files and Folders Permission hviado OS X - Operating System 1 06-16-2007 08:41 AM
Newbie question: Can you list folders before files? acmultimedia Switcher Hangout 3 02-01-2007 05:25 PM

All times are GMT -4. The time now is 05:11 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?