The more they are compressed, the more significant data is lost and the more the compression will be visible. The higher the compression ratio, the more the compression will start to affect significant portions of the audio.Īnother example of this is JPEG images. The compression may be unnoticeable to the user, but it does not contain all of the relevant information of the original. You can not convert the MP3 back into the same source file later on. This is called a lossy compression method because it really does lose the information from the original file that does not make it into the MP3. This is because an MP3 is created by analysing the waveform of the audio file and basically figuring out which data it can throw away permanently while still retaining the spirit or general sound of the original. This type of compression is fundamentally different than what we will be talking about in this guide. An MP3 is a compressed sound file that is used to create a smaller file from a larger source music file.
Let’s take for example an MP3 music file. When discussing compression in regards to computers and file types, the same terms can mean a few different things depending on context. Both of these areas represent opportunities to employ compression techniques. Furthermore, content itself is often repeated. Files are formatted in certain ways that make their general structure somewhat predictable, even if their content varies. Compression and Archival Basicsīefore we jump in to the actual tools we’ll be using, we should define our terms and discuss some of the different characteristics of compression and archiving techniques.Ĭompression is a way of reducing the size of a file on disk using different algorithms and mathematical calculations. We will be demoing these tools on an Ubuntu 12.04 VPS instance, but they will operate pretty much exactly the same on any modern Linux distribution. We will also touch on some associated operations, like archiving, which make our compression tools much more flexible. In this guide, we will discuss some of the different methods of compressing data and talk a bit about some of the trade-offs of various methods. Some of the more straightforward benefits are conserving disk space and using less bandwidth for network communication. Jacklyn Williams is a Digital Unite tutor.There are many reasons why you would want to compress files and directories on a computer. Your folder and its contents will be available to view and to edit. Make sure that the check box is ticked for show extracted files when complete. This will open the 'Windows Extraction Wizard'. Step 3: Select Extract all… from the menu which appears. Step 1: Browse to find the file you wish to uncompress.
#File compression how to
Your compressed file is then ready for storage or to send as an email attachment.įollow these step-by-step instructions on how to uncompress a file In this case a dialog box will appear to show you the progress of the compressing files.) (Depending upon the size of your files, you might need to wait for this process to be completed. Step 4: This will create a compressed folder with the same name as your original folder and in the same location, to which your files will be copied. Select Send to from the menu which appears and select Compressed (zipped) folder from the list of options. Step 3: When you are ready, right click on the file or folder that you want to compress. Then simply click and drag the file(s) you want to compress into the new folder.
Type in the name of the folder in the space where the text is highlighted. To create a new folder, right-click on the screen and scroll down to New and then to Folder. Step 2: If you wish to include two or more files and they are not already in a folder, you now need to put them into a folder. Browse to find the file that you want to compress. Step 1: Click the Start button in the bottom left-hand corner, and then click one of the library icons Documents, Pictures or Music to see any folders or files that have already been saved.
#File compression for mac
This guide is based on a PC running Windows 7, but the steps in this process also apply to XP, Vista and Windows, and are very similar for Mac users.įollow these step-by-step instructions to how to compress a file a file saved on your computer that you want to compress.Files that have been compressed must be uncompressed before they can be edited.
Compressed files use less disk space so they are easier to store and quicker and easier to send by email.
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