Compression - Paper 1

Question 1

Define lossy compression

Answer 1

Lossy compression is where some data is removed and discarded, reducing the file size.

Question 2

List some standards that use lossy compression.

Answer 2

• JPEG
• MPEG
• MP3

Question 3

Define lossless compression

Answer 3

Lossless compression is where the file size is reduced without any data being lost, resulting in less of a reduction than lossy.

Question 4

List some standards that use lossless compression

Answer 4

• PDF
• GIF

Question 5

Explain RLE

Answer 5

RLE (Run Length Encoding) is a lossless compression method that replaces runs of a particular value with the length and the one copy of the value.
For example 00000011111111000000 becomes 608160.