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How file compression works - How to compress large files on windows.


How compression works - How to compress large files on windows.
                            Hai there, welcome to promansystem. In the previous post we have discussed on how to save space on your hard disk. This time we will discuss on how file compression works and how to compress large files easily. Compression is another way through which you can assemble and manage a lot of files making them into stacks. This file stacks takes up less space as compared to the original files which is a great method to save you hard disk space.

What is File Compression and  How Does File Compression Work?

           We've all heard of file compression and are familiar with formats like .zip, .RAR, and .7z. File compression is at the core of how network works.
         Compressed files came into use with the internet. Compression allows us to share large files over the internet with less time compared to sending the original files itself. But have you ever wonder how file compression works? There are mainly two types of compression – lossless and lossy.

Lossless Compression:

                   Lossless compression basically works by removing Reparation or Redundancy. The files that get compressed takes up significantly less space as compared to the original. The lossless compression works by grouping the same data or files together. Let me make it simpler consider an example:

‘Streets Streets’
This data can be compressed to:
4s 4t 2r 4e

                          This is just one of method on how lossless compression works, but of course there are other complicated math tricks used for file compression. The best about lossless compression is that when a file is compressed, it is possible to reconstruct the original file all in one piece from the compressed one. No information gets lost or damaged hence the name lossless compression.
            Programs like WinZip, Winrar and 7 Zip use lossless compression. They remove this redundant data on compression and restore it when you decompress.
             In the case of graphics, PNG file format use lossless compression. They always offer a smaller file size for images. They group together all similar points thus reducing total space.

Lossy Compression:

           Yes of course there is a limit for compressing all files using lossless methods. One way is to remove additional information to save space. This is how lossy compression gets its name.
         For example an Mp3 file gets compressed by removing certain sounds which the human cannot hear. An Mp3 at its highest quality may not contain all of the audio information the original recorded sounds. Some sounds will be removed as part of the compression. The more you compress a file in lossy compression the more information is removed from that file, which is the reason why a heavily compressed audio file sounds Distorted.
         Lossy compression is mostly used for media files – graphical image, sound and video. Applying lossy compression on text files would be difficult, resulting information in garbled form. However media files does not require all the information for their working.
A common example of lossy compression is used in JPEG images. Images seen on the web do not need to be high-quality as images used for printing. Thus you can remove a lot of redundant information from a web image. Repeatedly compressing a file using lossless methods decreases its quality every time. It’s important to remember that lossy methods actually remove data from the original, which means that you cannot recreate the original file from one compressed one.

How To Compress a File?

>Simple compression - Windows:

Follow this steps to compress files on windows:

How To Compress a File on windowsStep 1: Right-click the desired file you want to compress. You can select multiple files by holding the Ctrl key while clicking each file.

Step 2: Right click the files and go to Send to > Compressed (zipped) Folder. The file will be compressed automatically.

Step 3: Locate the compressed file in the same folder as the original. It should have the same name as the original, though you can rename it if desired.

>Compression using software:

Follow this steps to compress files using software's: 

Step 1: Install a compression/decompression utility Software. Some popular compression formats are .zip, .RAR, and .7z.

Software’s like jZip, 7-Zip, Zipeg, and IZArc are free compression utilities available for Windows.

How To Compress a File - winrarStep 2: Right click on the files and got to compress to/compress with/send to/add to etc depending on which software you’ve installed. The file should begin to compress automatically.

Step 3: Locate the compressed file in the same folder as the original.



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This post first appeared on Informer Grid, please read the originial post: here

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