What is a compressed file? What are the advantages of different methods of compressing files?

Just use the computer office , You will definitely come into contact with words 、 Numbers 、 Audio 、 video 、 Language and other documents , Sometimes the file size is too large , When it is transmitted to the other party through the Internet , It's very time consuming , Sometimes it is impossible to transmit or interrupt , This is very unpleasant , If you compress large files , Not to go ？ therefore , Compressed files are popular in computer offices , Let's take you to know what the compressed file is ？

Compressed files

What is a compressed file ？

A compressed file is a file with a large capacity that is compressed , Generate a smaller file , This smaller file is called a compressed file , Common compressed file extensions , usually ZIP、RAR、7z ending , Of course, this is not rigorous enough , such as MP3、MP4、3GP、Gif、JPEG And so on image video audio file , It is also a compressed file , But the two sides focus on different things , A preference for data storage optimization , The other is partial distortion processing of image, sound and video , The essence is the same , By some coding algorithm , Repeat the data information 、 Reduce redundancy , So as to reduce the file size , therefore , Files with the above are called compressed files .

What are the advantages of different methods of compressing files ？

image RAR、ZIP、7z Advantages of compressed files , It is a lossless compression method , Files can be completely restored , It does not affect the contents of the document , For image video voice , There will be no loss of detail distortion ; image MP3、MP4、3GP、Gif、JPEG The advantages of such image, video and audio compressed files are , A lossy compression method , Although some details are distorted , however , People's feelings about color and sound are not obvious , To greatly reduce the size of compressed files .

Speaking of this , It must be clear to me that , Compressed files with different file extensions , The information content is different , Here's the test , If you use RAR、ZIP、7z Compression method , De compression MP3、MP4、3GP、Gif、JPEG And other image, video and audio compressed files , What will happen ？ The answer is that the image, video and audio files have been successfully compressed , But the compressed file size , The change is very small. , Some are almost unchanged .