CS Edexcel 2.3b Compression

What is a common application of lossy compression in everyday technology?

• Streaming music and video content

• Backing up files for security

• Storing documents in the cloud

• Editing high-resolution images

Which type of compression is which?

Data is permanently removed from the file - (a)  

The original data can be reconstructed - (b)  

• Lossy
• Lossless

Which of the following formats use lossy compression?

• MP3 audio files

• ZIP files

• PNG images

• JPEG images

Which of the following formats use lossless compression?

• MP3 audio files

• ZIP files

• PNG images

• JPEG images

Why is lossy compression important for websites?

• It makes files easier to load

• It prevents data loss during downloads

• It enhances the quality of images displayed

• It allows pages to load faster by reducing file size

ZIP is a format that will compress files together into one package. Why does it need to be lossless?

• So that you can get the smallest size possible from the package

• So that you can extract the files again from the package

• So that you can remove the unnecessary data from the files in the package