ISDD+Lossless+and+Lossy+Compression

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 * Video**

Watch [|this BBC video] on lossless vs lossy compression


 * Questions**

1. Give two reasons for compressing a file?

2. Explain what is meant by the term lossy compression.

3. Explain what is meant by the term lossless compression.

4. Which of the following statements is true: (A) It is possible to restore the original file when uncompressing a lossy compressed file (B) It is possible to restore the original file when uncompressing a lossless compressed file (C) Both of the above (D) None of the above

5. State which of the following compression techniques are lossless, and which are lossy: (a) GIF (b) Lempel–Ziv–Welch (LZW) (c) MP3 (d) JPEG (e) WAV (f) PNG (g) Run Length Encoding (RLE) (h) MP4

6. For each of the examples above, say whether the compression type applies to: (a) Graphics (b) Sound (d) Video