1.2 Compression

What is compression?

• Converts one file to another

• Reduces the size of a file to save space

• Minimizes the time taken for a file to be downloaded

• Increases transmission speeds

JPEG stands for…

• Joint Photo Exempted Grade

• Joint Photographic Experts Group

• Junior Photographic Export Group

Uncompressed audio and video files always require less memory than compressed files

• True

• False

Which of the following are not usually in a compressed format?

• JPEG

• MPEG

• Bitmap

• MP3

What type of compression will remove some of the data?

• Lossy

• Lossless

What type of compression is most appropriate to compress a text file

• Lossy

• Lossless

What type of compression would you use to compress a video and keep the quality?

• Lossy

• Lossless

What type of compression does the ZIP format use?

• Lossy

• Lossless

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

• An algorithm that stops data being deleted

What does Lossy Compression do to files?

• Increases the file size and keeps the same quality

• Eliminates no data at all

• Decreases the file size and keeps the same quality

• Eliminates unnecessary data in a file to reduce file size