Lossy and Lossless Compression

• What is the purpose of compression?

  To reduce file size and download times
• Why is making efficient use of bandwidth important?

  Due to vast amounts of data transmitted daily
• How does compression speed up data transmission?

  By reducing the overall size of a file
• What are the two methods of compression mentioned?

  Lossy compression and lossless compression
• What happens to a compressed file upon arrival at its destination?

  It needs to be uncompressed to be read
• How does color depth affect file size in images?

  More colors require more bits per pixel
• What is one way to reduce the file size of an image?

  Store fewer colors or larger pixel areas
• Why is lossy compression considered acceptable for multimedia?

  Quality loss is often not noticeable
• What is a characteristic of lossless compression?

  No original data is lost during compression
• When is lossless compression most effective?

  On images with large areas of continuous colors
• Which file types require lossless compression?

  Text documents and executable programs
• What are the key differences between lossy and lossless compression?

  • Lossy compression:
  • Some data is lost and cannot be recovered
  • Reduces quality slightly
  • Suitable for multimedia files
  • Lossless compression:
  • No data is lost
  • Original file can be recreated exactly
  • Suitable for text and executable files
• What is the key question to answer after watching the video?

  What is the difference between lossy and lossless compression?