OCR GCSE Computer Science - Compression

Makes the file smaller by deleting parts of the file permanently (forever)

• Lossy Compression
• Lossless Compression

Makes the file smaller by giving repeated patterns/colours a specific code

• Lossy Compression
• Lossless Compression

What would you use compression for?

• Making an image file smaller
• Modifying an image 

Which of the following would not be suitable for Lossy Compression?

• Images

• Music

• Videos

• Text

Compression in general makes it _______ to send, upload and stream data

• Quicker

• Slower

Lossless compression permanently deletes the data

• True

• False

Lossy compression would be suitable for text files

• True

• False

Compression looks for _______ data

• Unnecessary

• Repeated

There are _____ different types of compression

• 2

• 3

• 4

Select the advantages for lossy compression

• Makes the file much smaller

• Will send much quicker

• A very simple algorithm

• The quality will not be affected much