Lossy vs lossless compression

• What type of compression is lossy compression?

  Irreversible
• What is the goal of lossy compression regarding data changes?

  The changes should be unnoticeable
• What happens to the original data after lossless compression?

  The original data is fully restored
• What is a major trade-off of lossy compression?

  Quality loss occurs
• How does lossy compression affect file sizes?

  It results in smaller file sizes
• What is lossy compression?

  A method that reduces file size
• What happens to the decompressed file in lossy compression?

  It isn't exactly the same as the original
• How does the decompressed file compare to the original in lossless compression?

  The decompressed file is identical to the original
• What is the aim of lossy compression?

  To remove unnoticeable data
• Why should the changes in lossy compression be hard to spot?

  To maintain perceived quality
• What is the result of decompressing a lossy compressed file?

  It isn't identical to the original
• What is a consequence of using lossy compression compared to lossless compression?

  It results in larger files than lossy methods
• How does lossless compression differ from lossy compression?

  Lossless compression retains all original data
• What is the main trade-off of lossy compression?

  It sacrifices quality to reduce file size
• Why do lossless methods produce larger files than lossy methods?

  They keep all information intact
• What is the main difference between lossless and lossy compression?

  Lossy compression discards some data
• What is the definition of "lossless" compression?

  Reduces file size without any loss of data
• What are the tradeoffs between lossless and lossy compression?

  Lossless:

  • Retains original file quality
  • Larger compressed file sizes

  
  

  Lossy:

  • Reduced file quality, degradation
  • Smaller compressed file sizes
• What happens to data during lossless compression?

  No data is lost during compression
• Why might someone choose lossless compression over lossy compression?

  To maintain the highest quality of data
• What are the key characteristics of lossless compression?

  • Fully recover original file
  • No data loss during compression
  • Generally larger file sizes than lossy methods
• What is a key characteristic of lossless compression?

  It allows full recovery of the original file
• Why is lossless compression useful?

  It retains the original data quality and information
• What are the advantages of lossless compression?

  • Retains file quality (no data loss)
  • Allows recovery of original file
  • Suitable for images, audio, text
• What is the typical file size comparison between lossless and lossy compression?

  Lossless is larger, lossy is smaller
• What is lossless compression?

  Reduces file size without losing information
• What is the main function of lossy compression?

  Removes data permanently
• What happens to data in lossy compression?

  Data is permanently removed
• What happens to the quality of data in lossy compression?

  Quality is degraded
• In lossy compression, what happens to the file size?

  The file size decreases
• In lossless compression, how does the restored file compare to the original?

  It is exactly the same
• What are the key differences between lossless and lossy compression methods?

  • Lossless:
  • Restores data perfectly
  • Keeps all information
  • Larger file size
  • Perfect quality
  • Lossy:
  • Removes data permanently
  • Discards unnecessary information
  • Smaller file size
  • Degraded quality
• What is the main advantage of lossy compression?

  Greater space savings
• What is Lossy Compression?

  • Some data is lost during the compression process.
  • The restored file is not identical to the original.
• What is the median file size of the Reference PNG image?

  252 KB
• How do the file sizes of the different image formats compare?

  • Reference PNG has the largest file size at 252 KB
  • OxiPNG is slightly smaller at 223 KB
  • OxiPNG + Zopfli is smaller at 207 KB
  • Lossless WebP has the smallest file size at 148 KB
  • Lossless AVIF is 203 KB
  • Lossless JPEG XL is 131 KB, the second smallest
• What is the file size of JPEG XL?

  131KB
• What does lossless compression guarantee?

  Identical restoration of the original data
• What is a common file format for lossless compression?

  ZIP
• What does lossless compression guarantee regarding original quality?

  Guarantees original quality retention