No, Operating system is not resposible for file compression. It is the task of utilities that come bundled with OS or installed by you. Some well known utilities are 7-zip, WinZip, WinRar, etc.
JPG, GIF, and PNG as they are already compressed files
The program allows large files to be compressed for either sending via e-mail or transferring to another source (e.g. from desktop computer to laptop). One must have the accompaning unzip program to allow the files to be redistruted to whatever source was chosen
File Compression
The areas of compression are lossless compression and lossy compression. Lossless compression reduces the file size without sacrificing any data quality, while lossy compression reduces the file size by discarding some data, which may lead to a decrease in quality.
Some disadvantages of file compression include potential loss of quality in the compressed file, longer processing time required for compression and decompression, and the need for specialized software to compress and decompress files. Additionally, some compressed file formats may not be widely supported, leading to compatibility issues.
Types of software utilities are as below: Disk Storage Disk Defragmenters Disk Checkers Disk Cleaners Disk Space Analyzers Disk Partitions Backup Disk Compression File Managers Archive System Profiles Anti-Virus Hex Editors Data Compression Cryptographic Launcher Applications Registry Cleaners Network Utilities Command Line Interface Graphical User Interface
I think answer is File Compression
Compression ratio in engineering can be calculated by dividing the total volume of a system before compression by the total volume after compression. In computing, file compression ratios are calculated by comparing the original file size to the compressed file size.
There are many pieces of software that can test the quality of a file compression software. The file compression software itself can give a percentage of compression, as well as a verification of whether it is compressed properly. One can also check the 'checksum' of the file.
There are many programs that will do relatively the same thing. Some more known than others, and some for certain file formats. Because there are many file formats (.zip, .rar, .gz, .arj, .cab, etc....) sometimes you may need a specific utility for a format. The most common are .zip and .rar, but they are not necessarily the best.
The unknown compression method used in this file is not specified or identified.