a method where data is permanently lost during the compression process and must be approximated when the file is decompressed

a method of compression where no data is permanently lost during the process

File size and compression

Computing

In this unit, pupils will focus on digital media such as images and sounds, and discover the binary digits that lie beneath these types of media. They will explore how images and sound can be manipulated and consider the link between quality of images and sound and the resulting file size.

Data representation: images and sound

What type of compression permanently removes data?

What is the term for compression that retains all original data?

Which compression method is typically used for audio and video files to save space?

How does compression affect file transfer speeds?

it retains all original data without quality loss

What is a key feature of lossless compression?

What is the smallest unit of data in a computer system?

What is the term for the number of pixels in an image?

What happens when you increase the resolution of an image?

the number of bits used to represent a colour

What is the effect of using a higher sample resolution for sound files?

larger files always transfer at the same speed as smaller files

larger files transfer faster than smaller files

larger files transfer slower than smaller files

How does the size of a file affect its transfer speed over a network?

This lesson will be removed by end of Summer Term 2025.

File size and compression

Lesson outcome

This lesson will be removed by end of Summer Term 2025.