total amount of pixels an image contains based on its width and height expressed in pixels

the number of bits used to represent the colour of each pixel, which is also known as bit depth

a measure of how much binary data a file contains

File size of digital images

Computing

Representing images with binary data

Manipulating digital images

Representing sound with binary data

Editing sound

File size and compression

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 happens when you increase the colour depth of an image?

How can file size be reduced without changing resolution?

What is the file size of a file measuring 10 x 10 pixels and which allows 4 colours?

a single element of an image on a computer screen

What does RGB stand for in digital imaging?

What unit is used to measure data in a computer system?

What can happen to an image if you make it bigger?

File size of digital images

Lesson outcome