Questions tagged [compression]

The re-encoding of a file or data into a form that uses fewer bits of information than the original data.

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14
votes
2answers
3k views

why does OSX add extra '._<filename>' when I tar a directory?

I'd just like to know why if I "tar -czf" a file/directory, osx adds a: ._ for each file? I see these when I untar in linux. Or when I work with the uncompressed project in eclipse as it doesn't ...
14
votes
4answers
3k views

Tools to compress and encrypt files

I want to compress several files and encrypt them with a password if possible. Are there any build-in tools in Mac OS that provide such functionality? If not, can you recommend me a (freeware) ...
25
votes
4answers
36k views

How do I create a DMG file from a directory?

I'm trying to add a few files into a dmg. How do I create a DMG file from a directory?
16
votes
4answers
8k views

Creating an automated HFS+ compressed folder

I would like to set up an automated way for archiving files in OS X Lion. By archiving I mean using HFS+ compression feature on a specific folder, and make every file that I move into this folder ...
8
votes
0answers
3k views

Can I turn off swap and/or memory compression on macOS 10.12, Sierra?

Is there a way with macOS 10.12, Sierra, to safely turn off compressed memory? And is there a way to turn off safely swap? This was possible on macOS 10.9 and macOS 10.10. Although it sometimes ...
21
votes
4answers
12k views

Why are so many Mac downloads a .dmg just that contains a single .pkg?

I've noticed that many downloads are a dmg (disk image) that contains a single pkg file (installation package). Usually the pkg seems to be already compressed since the dmg doesn't reduce the file ...
5
votes
1answer
1k views

How do I transparently compress a directory?

I'd like to enable HFS+ compression for a directory, applying it to both the existing files in that directory and newly copied files. I expect to be able to read and write the contents of that ...
7
votes
3answers
49k views

How can I make a PDF document smaller?

Here's my problem, I have a PDF document 583KB, and I want to make it under 500KB so I can upload it. What should I do?
2
votes
3answers
137 views

Is it okay to compress application files? (Especially licensed applications)

I have attempted to research this but given the fact that applications exist to compress other files, I've found it difficult to learn about compressing applications themselves. I presume its okay to ...
3
votes
1answer
16k views

Does the iPhone compress emailed videos?

When you open a video in the Photos app and choose to send it via email, does the video get compressed, or is it sent using the same resolution it was shot in? I'm mainly wondering about the iPhone 4....