It can be either lossless or lossy.Ī smaller-sized compressed file can be restored to its larger form - in its entirety or with some data loss, depending on the compression type - by decompression. What is file compression?ĭigital files such as image files are often "compressed" to reduce their size and/or to change various attributes, such as:Ĭompression reduces the size of a file, often without appreciable loss of information. When the file is uncompressed, some of the original information is not there, although the user may not notice it. Lossy compression reduces a file by permanently eliminating certain information, especially redundant information. With lossless compression, every bit of data originally in a file remains after it is uncompressed, and all the information is restored. Lossless and lossy file compression describe whether all original data can be recovered when the file is uncompressed.
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