OCR Computer Science - 2.6 - Compression

The purpose of data compression is to decrease file sizes .

• True
• False

A jpeg is a compressed image file.

• True
• False

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 is Lossless Compression?

• No information is lost but file size is increased
• There is no loss of information at all after compression
• Files which have the exact same data after compression
• Compression involves an algorithm

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

When Lossy compression is used data is lost?

• True
• False

The audio file format MP3 is:

• Lossy
• Lossless

The video file format MP4 is:

• Lossy
• Lossless

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

• Lossy Compression
• Lossless Compression