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  • Hey guys why do we need compression?
  • Also 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.​
  • we need compression because Processing power and storage space is very valuable on a computer.
  • But what is the difference between lossy and lossless?
  • Well with lossy compression unneeded data is removed and discarded, thereby reducing the overall amount of data and the size of the file.​ 
  • But how does it work?
  • An image can be compressed by reducing its colour depth. This reduces the range of colours that the image contains. This results in an averaging of shades of colours. 
  • Also For example, a very light shade of green could be averaged with a not so light shade - the very light shade might be discarded, and the pixels affected by it re-coloured with the darker shade.​
  • so how does lossless compression work?
  • With lossless compression, files are reduced in size without the loss of data. However, lossless compression does not usually achieve the same file size reduction as lossy compression.​
  • Various lossless standards exist:​PDF allows lossless compression of text documents​GIF is a lossless image file format​ . The picture quality remains the same and does not get worse. The file can also be decompressed to its original quality . 
  •  when do we use lossy compression?
  • Lossy compression is most used to compress multimedia data for example audio, video, and images, especially in applications such as streaming media and the internet . ​
  • So when is lossless compression used?
  • Lossless compression is used in cases where it is important that the original and the decompressed data be identical, or where deviations from the original data would be unfavourable. Typical examples are executable programs, text documents, and source code.​
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