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There are various algorithms for doing this, usually by looking for patterns in the data that are repeated. No data is lost, so lossless compression allows a file to be recreated exactly as it was when originally created. Lossless compression doesn’t reduce the quality of the file at all. Once a file has been compressed using lossy compression, the discarded data cannot be retrieved again. A popular lossy compression method for sounds is MP3. This can result in a small loss of quality of an image or sound file.Ī popular lossy compression method for images is the JPEG, which is why most images on the internet are JPEG images. This might mean reducing the numbers of colours in an image or reducing the number of samples in a sound file. Lossy compression removes some of a file’s original data in order to reduce the file size. There are two main types of compression: lossy and lossless. In addition, large files take a lot longer to download or upload which leads to web pages, songs and videos that take longer to load and play when using the internet.Īny kind of data can be compressed. To get the best out of both, it can mean that we need to reduce the file size of text, image and audio data in order to transfer it more quickly and so that it takes up less storage space. Processing power and storage space is very valuable on a computer.
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