COMPRESION

COMPRESION

1. Data compression

   • is when we make file sizes smaller, while trying to make the compressed file as true to the original as possible
   • Uses of compressing data files
     • smaller files take up less storage space on a device
     • streaming and downloading files from internet is quicker
     • allows you to send the same content with much smaller file size

2. LOSSY COM,PRESSION

   • works by permanently removing data from the file - this limits the number of bits the file needs and so reduces its size
   • Pros
     • greatly reduced file size, meaning more files can be stored
     • lossy files take up less bandwidth so can be downloaded and streamed more quickly
     • commonly used - lots of software can read lossy files
   • Cons
     • lossy compression lo0ses data and the file cant be turned back into original
     • lossy compression cant be used on text or software files as these files need to retain all the information of the orginal
     • lossy files are worse quality than the original but this loss in quality is normally unnoticeable
   • file types
     • MP3(audio)
     • AAC(audio)
     • JPEG(image)

3. LOSSLESS COMPRESSION

   • makes the file smaller by temporarily removing data to store the file and then restores it to its original; state when its opened
   • Pros
     • Data is only removed temporarily so there is no reduction in quality
     • Lossless files can be turned back into original
     • lossless compression can be used on text and software files
   • Cons
     • only a slight reduction in file size so lossless files still take up quite a bit space on your device
   • File types
     • FLAC (audio)
     • TIFF (image)
     • PNG (image)