Lossy and loseless compression

Question 1

Advantages of loseless compression

Answer 1

• Quality better than lossy
• Data not permenantly removed // Original file is retained

Question 2

How lossy compresses files

Answer 2

• A compression algorithm is used
• Image/sound resolution reduced
• Repeating frames (data) could be removed
• Sounds not heard by human ear could be removed
• Colour depth could be reduced

Question 3

Disadvantages of loseless compression

Answer 3

• Takes more time to transmit file
• Takes up more storage space
• Uses more bandwidth

Question 4

Disadvantages of lossy compression

Answer 4

• Quality may be reduced
• Data is permentantely lost // original file cannot be reconstructed