Year 11 compression

What is compression?

• To convert one file to another

• To reduce the size of data to save space

• To minimise the time taken for a file to be downloaded

• To compress something by pressing it very hard

What does Lossy compression do to files?

• Increases the file size and keeps the same quality

• Eliminates no information at all

• Decreases the file size and keeps the same quality

• Eliminates unnecessary information in a file to reduce file size

What is lossless compression?

• No information is lost but file size is increased

• There is no loss in information at all after compression

• Files which have the exact same data after compression

• Compression that involves an algorithm

What type of compression does the ZIP format use?

• Lossy

• Lossless

What type of compression would you use to compress a video?

• Lossy

• Lossless

What type of compression would you use to compress a text file?

• Lossy

• Lossless

What type of compression may remove some of the data?

• Lossy

• Lossless

Which of the following are not in a compressed format?

• JPEG

• MPEG

• Bitmap

• MP3

Uncompressed audio and video files require less memory than compressed files

• True

• False

Which type of compression does Huffman coding use?

• Lossy

• Lossless